1e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 2e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * jdmarker.c 3e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 4e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Copyright (C) 1991-1998, Thomas G. Lane. 5e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file is part of the Independent JPEG Group's software. 6e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * For conditions of distribution and use, see the accompanying README file. 7e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 8e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file contains routines to decode JPEG datastream markers. 9e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Most of the complexity arises from our desire to support input 10e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * suspension: if not all of the data for a marker is available, 11e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * we must exit back to the application. On resumption, we reprocess 12e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the marker. 13e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 14e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 15e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define JPEG_INTERNALS 16e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jinclude.h" 17e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jpeglib.h" 18e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 19e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 20e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef enum { /* JPEG marker codes */ 21e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF0 = 0xc0, 22e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF1 = 0xc1, 23e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF2 = 0xc2, 24e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF3 = 0xc3, 25e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 26e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF5 = 0xc5, 27e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF6 = 0xc6, 28e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF7 = 0xc7, 29e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 30e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_JPG = 0xc8, 31e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF9 = 0xc9, 32e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF10 = 0xca, 33e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF11 = 0xcb, 34e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 35e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF13 = 0xcd, 36e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF14 = 0xce, 37e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOF15 = 0xcf, 38e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 39e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DHT = 0xc4, 40e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 41e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DAC = 0xcc, 42e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 43e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST0 = 0xd0, 44e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST1 = 0xd1, 45e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST2 = 0xd2, 46e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST3 = 0xd3, 47e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST4 = 0xd4, 48e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST5 = 0xd5, 49e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST6 = 0xd6, 50e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_RST7 = 0xd7, 51e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 52e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOI = 0xd8, 53e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_EOI = 0xd9, 54e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_SOS = 0xda, 55e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DQT = 0xdb, 56e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DNL = 0xdc, 57e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DRI = 0xdd, 58e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_DHP = 0xde, 59e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_EXP = 0xdf, 60e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 61e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP0 = 0xe0, 62e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP1 = 0xe1, 63e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP2 = 0xe2, 64e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP3 = 0xe3, 65e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP4 = 0xe4, 66e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP5 = 0xe5, 67e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP6 = 0xe6, 68e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP7 = 0xe7, 69e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP8 = 0xe8, 70e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP9 = 0xe9, 71e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP10 = 0xea, 72e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP11 = 0xeb, 73e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP12 = 0xec, 74e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP13 = 0xed, 75e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP14 = 0xee, 76e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_APP15 = 0xef, 77e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 78e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_JPG0 = 0xf0, 79e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_JPG13 = 0xfd, 80e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_COM = 0xfe, 81e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 82e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_TEM = 0x01, 83e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 84e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov M_ERROR = 0x100 85e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} JPEG_MARKER; 86e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 87e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 88e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Private state */ 89e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 90e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef struct { 91e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov struct jpeg_marker_reader pub; /* public fields */ 92e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 93e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Application-overridable marker processing methods */ 94e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_marker_parser_method process_COM; 95e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_marker_parser_method process_APPn[16]; 96e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 97e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Limit on marker data length to save for each marker type */ 98e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int length_limit_COM; 99e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int length_limit_APPn[16]; 100e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 101e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Status of COM/APPn marker saving */ 102e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_saved_marker_ptr cur_marker; /* NULL if not processing a marker */ 103e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int bytes_read; /* data bytes read so far in marker */ 104e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Note: cur_marker is not linked into marker_list until it's all read. */ 105e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} my_marker_reader; 106e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 107e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef my_marker_reader * my_marker_ptr; 108e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 109e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 110e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 111e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Macros for fetching data from the data source module. 112e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 113e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect 114e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the current restart point; we update them only when we have reached a 115e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * suitable place to restart if a suspension occurs. 116e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 117e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 118e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Declare and initialize local copies of input pointer/count */ 119e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define INPUT_VARS(cinfo) \ 120e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov struct jpeg_source_mgr * datasrc = (cinfo)->src; \ 121e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov const JOCTET * next_input_byte = datasrc->next_input_byte; \ 122e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov size_t bytes_in_buffer = datasrc->bytes_in_buffer 123e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 124e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Unload the local copies --- do this only at a restart boundary */ 125e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define INPUT_SYNC(cinfo) \ 126e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ( datasrc->next_input_byte = next_input_byte, \ 127e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov datasrc->bytes_in_buffer = bytes_in_buffer ) 128e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 129e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Reload the local copies --- used only in MAKE_BYTE_AVAIL */ 130e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define INPUT_RELOAD(cinfo) \ 131e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ( next_input_byte = datasrc->next_input_byte, \ 132e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_in_buffer = datasrc->bytes_in_buffer ) 133e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 134e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available. 135e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Note we do *not* do INPUT_SYNC before calling fill_input_buffer, 136e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * but we must reload the local copies after a successful fill. 137e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 138e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define MAKE_BYTE_AVAIL(cinfo,action) \ 139e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (bytes_in_buffer == 0) { \ 140e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*datasrc->fill_input_buffer) (cinfo)) \ 141e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov { action; } \ 142e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_RELOAD(cinfo); \ 143e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 144e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 145e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Read a byte into variable V. 146e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * If must suspend, take the specified action (typically "return FALSE"). 147e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 148e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define INPUT_BYTE(cinfo,V,action) \ 149e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ 150e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_in_buffer--; \ 151e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov V = GETJOCTET(*next_input_byte++); ) 152e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 153e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* As above, but read two bytes interpreted as an unsigned 16-bit integer. 154e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * V should be declared unsigned int or perhaps INT32. 155e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 156e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define INPUT_2BYTES(cinfo,V,action) \ 157e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ 158e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_in_buffer--; \ 159e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \ 160e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAKE_BYTE_AVAIL(cinfo,action); \ 161e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_in_buffer--; \ 162e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov V += GETJOCTET(*next_input_byte++); ) 163e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 164e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 165e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 166e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Routines to process JPEG markers. 167e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 168e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Entry condition: JPEG marker itself has been read and its code saved 169e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * in cinfo->unread_marker; input restart point is just after the marker. 170e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 171e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Exit: if return TRUE, have read and processed any parameters, and have 172e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * updated the restart point to point after the parameters. 173e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * If return FALSE, was forced to suspend before reaching end of 174e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * marker parameters; restart point has not been moved. Same routine 175e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * will be called again after application supplies more input data. 176e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 177e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This approach to suspension assumes that all of a marker's parameters 178e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * can fit into a single input bufferload. This should hold for "normal" 179e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * markers. Some COM/APPn markers might have large parameter segments 180e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * that might not fit. If we are simply dropping such a marker, we use 181e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * skip_input_data to get past it, and thereby put the problem on the 182e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * source manager's shoulders. If we are saving the marker's contents 183e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * into memory, we use a slightly different convention: when forced to 184e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * suspend, the marker processor updates the restart point to the end of 185e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * what it's consumed (ie, the end of the buffer) before returning FALSE. 186e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * On resumption, cinfo->unread_marker still contains the marker code, 187e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * but the data source will point to the next chunk of marker data. 188e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * The marker processor must retain internal state to deal with this. 189e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 190e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Note that we don't bother to avoid duplicate trace messages if a 191e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * suspension occurs within marker parameters. Other side effects 192e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * require more care. 193e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 194e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 195e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 196e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 197e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_soi (j_decompress_ptr cinfo) 198e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process an SOI marker */ 199e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 200e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i; 201e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 202e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS(cinfo, 1, JTRC_SOI); 203e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 204e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->marker->saw_SOI) 205e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_SOI_DUPLICATE); 206e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 207e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Reset all parameters that are defined to be reset by SOI */ 208e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 209e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < NUM_ARITH_TBLS; i++) { 210e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_dc_L[i] = 0; 211e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_dc_U[i] = 1; 212e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_ac_K[i] = 5; 213e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 214e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->restart_interval = 0; 215e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 216e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Set initial assumptions for colorspace etc */ 217e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 218e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->jpeg_color_space = JCS_UNKNOWN; 219e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */ 220e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 221e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->saw_JFIF_marker = FALSE; 222e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */ 223e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_minor_version = 1; 224e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->density_unit = 0; 225e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->X_density = 1; 226e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Y_density = 1; 227e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->saw_Adobe_marker = FALSE; 228e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Adobe_transform = 0; 229e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 230e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->saw_SOI = TRUE; 231e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 232e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 233e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 234e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 235e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 236e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 237e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith) 238e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a SOFn marker */ 239e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 240e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 241e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int c, ci; 242e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info * compptr; 243e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* LiuSunliang added 20111209 */ 244e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION image_width, image_height; 245e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 246e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 247e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progressive_mode = is_prog; 248e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_code = is_arith; 249e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 250e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 251e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 252e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE); 253e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, image_height, return FALSE); 254e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, image_width, return FALSE); 255e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, cinfo->num_components, return FALSE); 256e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 257e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (image_width <= JPEG_MAX_DIMENSION) 258e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->image_width = image_width; 259e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 260e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (image_height <= JPEG_MAX_DIMENSION) 261e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->image_height = image_height; 262e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 263e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 8; 264e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 265e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker, 266e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (int) cinfo->image_width, (int) cinfo->image_height, 267e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->num_components); 268e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 269e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->marker->saw_SOF) 270e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_SOF_DUPLICATE); 271e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 272e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* We don't support files in which the image height is initially specified */ 273e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* as 0 and is later redefined by DNL. As long as we have to check that, */ 274e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* might as well have a general sanity check. */ 275e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->image_height <= 0 || cinfo->image_width <= 0 276e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov || cinfo->num_components <= 0) 277e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_EMPTY_IMAGE); 278e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 279e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != (cinfo->num_components * 3)) 280e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 281e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 282e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->comp_info == NULL) /* do only once, even if suspend */ 283e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small) 284e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((j_common_ptr) cinfo, JPOOL_IMAGE, 285e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->num_components * SIZEOF(jpeg_component_info)); 286e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 287e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 288e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 289e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->component_index = ci; 290e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, compptr->component_id, return FALSE); 291e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* XYQ 2008-03-25: Adobe CMYK JPEG has serious flaw: the K channel has same component id as C channel */ 292e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov { 293e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i; 294e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < ci; i ++) 295e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (compptr->component_id == cinfo->comp_info[i].component_id) break; 296e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (i < ci) 297e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Found the error! We replace the id with something unlikely used elsewhere */ 298e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->component_id += 0xf0; 299e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 300e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* end of modification */ 301e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 302e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->h_samp_factor = (c >> 4) & 15; 303e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->v_samp_factor = (c ) & 15; 304e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE); 305e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 306e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT, 307e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->component_id, compptr->h_samp_factor, 308e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->v_samp_factor, compptr->quant_tbl_no); 309e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 310e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 311e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->saw_SOF = TRUE; 312e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 313e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 314e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 315e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 316e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 317e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 318e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 319e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_sos (j_decompress_ptr cinfo) 320e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a SOS marker */ 321e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 322e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 323e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i, ci, n, c, cc; 324e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info * compptr; 325e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 326e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 327e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! cinfo->marker->saw_SOF) 328e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_SOS_NO_SOF); 329e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 330e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 331e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 332e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */ 333e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 334e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_SOS, n); 335e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 336e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN) 337e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 338e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 339e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->comps_in_scan = n; 340e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 341e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Collect the component-spec parameters */ 342e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 343e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < n; i++) { 344e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, cc, return FALSE); 345e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 346e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 347e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* XYQ 2008-03-25: Adobe CMYK JPEG has serious flaw: the K channel has same component id as C channel */ 348e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov { 349e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int j; 350e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (j = 0; j < i; j ++) 351e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cc == cinfo->cur_comp_info[j]->component_id) break; 352e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (j < i) 353e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* found the error! */ 354e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cc += 0xf0; 355e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 356e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* end of modification */ 357e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 358e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 359e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cc == compptr->component_id) 360e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov goto id_found; 361e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 362e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 363e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); 364e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 365e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov id_found: 366e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 367e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->cur_comp_info[i] = compptr; 368e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->dc_tbl_no = (c >> 4) & 15; 369e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->ac_tbl_no = (c ) & 15; 370e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 371e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc, 372e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->dc_tbl_no, compptr->ac_tbl_no); 373e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* This CSi (cc) should differ from the previous CSi */ 374e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < i; ci++) { 375e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->cur_comp_info[ci] == compptr) 376e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); 377e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 378e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 379e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 380e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Collect the additional scan parameters Ss, Se, Ah/Al. */ 381e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 382e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ss = c; 383e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 384e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Se = c; 385e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 386e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ah = (c >> 4) & 15; 387e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Al = (c ) & 15; 388e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 389e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se, 390e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ah, cinfo->Al); 391e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 392e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Prepare to scan data & restart markers */ 393e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->next_restart_num = 0; 394e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 395e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Count another SOS marker */ 396e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->input_scan_number++; 397e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 398e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 399e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 400e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 401e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 402e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 403e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef D_ARITH_CODING_SUPPORTED 404e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 405e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 406e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_dac (j_decompress_ptr cinfo) 407e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a DAC marker */ 408e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 409e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 410e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int index, val; 411e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 412e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 413e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 414e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 415e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 416e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (length > 0) { 417e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, index, return FALSE); 418e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, val, return FALSE); 419e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 420e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 421e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 422e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_DAC, index, val); 423e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 424e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (index < 0 || index >= (2*NUM_ARITH_TBLS)) 425e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_DAC_INDEX, index); 426e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 427e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (index >= NUM_ARITH_TBLS) { /* define AC table */ 428e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val; 429e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { /* define DC table */ 430e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F); 431e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->arith_dc_U[index] = (UINT8) (val >> 4); 432e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index]) 433e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_DAC_VALUE, val); 434e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 435e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 436e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 437e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != 0) 438e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 439e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 440e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 441e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 442e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 443e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 444e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else /* ! D_ARITH_CODING_SUPPORTED */ 445e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 446e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define get_dac(cinfo) skip_variable(cinfo) 447e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 448e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif /* D_ARITH_CODING_SUPPORTED */ 449e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 450e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 451e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 452e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_dht (j_decompress_ptr cinfo) 453e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a DHT marker */ 454e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 455e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 456e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov UINT8 bits[17]; 457e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov UINT8 huffval[256]; 458e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i, index, count; 459e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JHUFF_TBL **htblptr; 460e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 461e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 462e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 463e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 464e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 465e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (length > 16) { 466e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, index, return FALSE); 467e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 468e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_DHT, index); 469e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 470e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bits[0] = 0; 471e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov count = 0; 472e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 1; i <= 16; i++) { 473e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, bits[i], return FALSE); 474e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov count += bits[i]; 475e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 476e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 477e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 1 + 16; 478e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 479e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS8(cinfo, 2, JTRC_HUFFBITS, 480e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bits[1], bits[2], bits[3], bits[4], 481e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bits[5], bits[6], bits[7], bits[8]); 482e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS8(cinfo, 2, JTRC_HUFFBITS, 483e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bits[9], bits[10], bits[11], bits[12], 484e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bits[13], bits[14], bits[15], bits[16]); 485e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 486e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Here we just do minimal validation of the counts to avoid walking 487e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * off the end of our table space. jdhuff.c will check more carefully. 488e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 489e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (count > 256 || ((INT32) count) > length) 490e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); 491e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 492e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < count; i++) 493e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, huffval[i], return FALSE); 494e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 495e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= count; 496e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 497e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (index & 0x10) { /* AC table definition */ 498e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov index -= 0x10; 499e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov htblptr = &cinfo->ac_huff_tbl_ptrs[index]; 500e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { /* DC table definition */ 501e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov htblptr = &cinfo->dc_huff_tbl_ptrs[index]; 502e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 503e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 504e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (index < 0 || index >= NUM_HUFF_TBLS) 505e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_DHT_INDEX, index); 506e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 507e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (*htblptr == NULL) 508e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); 509e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 510e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); 511e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval)); 512e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 513e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 514e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != 0) 515e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 516e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 517e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 518e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 519e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 520e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 521e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 522e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 523e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_dqt (j_decompress_ptr cinfo) 524e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a DQT marker */ 525e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 526e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 527e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int n, i, prec; 528e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int tmp; 529e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JQUANT_TBL *quant_ptr; 530e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 531e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 532e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 533e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 534e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 535e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (length > 0) { 536e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, n, return FALSE); 537e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov prec = n >> 4; 538e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov n &= 0x0F; 539e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 540e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_DQT, n, prec); 541e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 542e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (n >= NUM_QUANT_TBLS) 543e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_DQT_INDEX, n); 544e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 545e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->quant_tbl_ptrs[n] == NULL) 546e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo); 547e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr = cinfo->quant_tbl_ptrs[n]; 548e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 549e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < DCTSIZE2; i++) { 550e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (prec) 551e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, tmp, return FALSE); 552e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 553e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, tmp, return FALSE); 554e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* We convert the zigzag-order table to natural array order. */ 555e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp; 556e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 557e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 558e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->err->trace_level >= 2) { 559e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < DCTSIZE2; i += 8) { 560e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS8(cinfo, 2, JTRC_QUANTVALS, 561e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr->quantval[i], quant_ptr->quantval[i+1], 562e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr->quantval[i+2], quant_ptr->quantval[i+3], 563e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr->quantval[i+4], quant_ptr->quantval[i+5], 564e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]); 565e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 566e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 567e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 568e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= DCTSIZE2+1; 569e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (prec) length -= DCTSIZE2; 570e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 571e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 572e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != 0) 573e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 574e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 575e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 576e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 577e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 578e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 579e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 580e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 581e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_dri (j_decompress_ptr cinfo) 582e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process a DRI marker */ 583e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 584e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 585e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int tmp; 586e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 587e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 588e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 589e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 590e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length != 4) 591e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_LENGTH); 592e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 593e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, tmp, return FALSE); 594e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 595e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_DRI, tmp); 596e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 597e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->restart_interval = tmp; 598e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 599e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 600e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 601e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 602e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 603e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 604e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 605e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Routines for processing APPn and COM markers. 606e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * These are either saved in memory or discarded, per application request. 607e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * APP0 and APP14 are specially checked to see if they are 608e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * JFIF and Adobe markers, respectively. 609e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 610e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 611e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define APP0_DATA_LEN 14 /* Length of interesting data in APP0 */ 612e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define APP14_DATA_LEN 12 /* Length of interesting data in APP14 */ 613e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define APPN_DATA_LEN 14 /* Must be the largest of the above!! */ 614e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 615e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 616e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 617e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovexamine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data, 618e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int datalen, INT32 remaining) 619e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Examine first few bytes from an APP0. 620e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Take appropriate action if it is a JFIF marker. 621e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * datalen is # of bytes at data[], remaining is length of rest of marker data. 622e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 623e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 624e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 totallen = (INT32) datalen + remaining; 625e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 626e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (datalen >= APP0_DATA_LEN && 627e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[0]) == 0x4A && 628e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[1]) == 0x46 && 629e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[2]) == 0x49 && 630e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[3]) == 0x46 && 631e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[4]) == 0) { 632e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Found JFIF APP0 marker: save info */ 633e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->saw_JFIF_marker = TRUE; 634e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_major_version = GETJOCTET(data[5]); 635e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_minor_version = GETJOCTET(data[6]); 636e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->density_unit = GETJOCTET(data[7]); 637e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]); 638e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]); 639e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Check version. 640e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Major version must be 1, anything else signals an incompatible change. 641e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * (We used to treat this as an error, but now it's a nonfatal warning, 642e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * because some bozo at Hijaak couldn't read the spec.) 643e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Minor version should be 0..2, but process anyway if newer. 644e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 645e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->JFIF_major_version != 1) 646e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov WARNMS2(cinfo, JWRN_JFIF_MAJOR, 647e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_major_version, cinfo->JFIF_minor_version); 648e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Generate trace messages */ 649e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS5(cinfo, 1, JTRC_JFIF, 650e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->JFIF_major_version, cinfo->JFIF_minor_version, 651e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->X_density, cinfo->Y_density, cinfo->density_unit); 652e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Validate thumbnail dimensions and issue appropriate messages */ 653e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (GETJOCTET(data[12]) | GETJOCTET(data[13])) 654e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL, 655e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[12]), GETJOCTET(data[13])); 656e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov totallen -= APP0_DATA_LEN; 657e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (totallen != 658e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3)) 659e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen); 660e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else if (datalen >= 6 && 661e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[0]) == 0x4A && 662e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[1]) == 0x46 && 663e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[2]) == 0x58 && 664e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[3]) == 0x58 && 665e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[4]) == 0) { 666e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Found JFIF "JFXX" extension APP0 marker */ 667e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* The library doesn't actually do anything with these, 668e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * but we try to produce a helpful trace message. 669e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 670e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (GETJOCTET(data[5])) { 671e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 0x10: 672e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen); 673e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 674e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 0x11: 675e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen); 676e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 677e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 0x13: 678e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen); 679e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 680e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: 681e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION, 682e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[5]), (int) totallen); 683e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 684e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 685e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 686e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Start of APP0 does not match "JFIF" or "JFXX", or too short */ 687e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen); 688e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 689e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 690e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 691e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 692e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 693e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovexamine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data, 694e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int datalen, INT32 remaining) 695e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Examine first few bytes from an APP14. 696e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Take appropriate action if it is an Adobe marker. 697e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * datalen is # of bytes at data[], remaining is length of rest of marker data. 698e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 699e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 700e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int version, flags0, flags1, transform; 701e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 702e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (datalen >= APP14_DATA_LEN && 703e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[0]) == 0x41 && 704e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[1]) == 0x64 && 705e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[2]) == 0x6F && 706e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[3]) == 0x62 && 707e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov GETJOCTET(data[4]) == 0x65) { 708e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Found Adobe APP14 marker */ 709e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]); 710e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]); 711e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]); 712e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov transform = GETJOCTET(data[11]); 713e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform); 714e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->saw_Adobe_marker = TRUE; 715e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Adobe_transform = (UINT8) transform; 716e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 717e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Start of APP14 does not match "Adobe", or too short */ 718e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining)); 719e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 720e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 721e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 722e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 723e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 724e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovget_interesting_appn (j_decompress_ptr cinfo) 725e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Process an APP0 or APP14 marker without saving it */ 726e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 727e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 728e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JOCTET b[APPN_DATA_LEN]; 729e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int i, numtoread; 730e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 731e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 732e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 733e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 734e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 735e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* get the interesting part of the marker data */ 736e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length >= APPN_DATA_LEN) 737e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov numtoread = APPN_DATA_LEN; 738e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else if (length > 0) 739e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov numtoread = (unsigned int) length; 740e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 741e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov numtoread = 0; 742e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < numtoread; i++) 743e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, b[i], return FALSE); 744e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= numtoread; 745e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 746e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* process it */ 747e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (cinfo->unread_marker) { 748e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP0: 749e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length); 750e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 751e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP14: 752e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length); 753e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 754e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: 755e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* can't get here unless jpeg_save_markers chooses wrong processor */ 756e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); 757e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 758e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 759e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 760e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* skip any remaining data -- could be lots */ 761e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 762e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length > 0) 763e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->src->skip_input_data) (cinfo, (long) length); 764e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 765e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 766e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 767e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 768e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 769e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef SAVE_MARKERS_SUPPORTED 770e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 771e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 772e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovsave_marker (j_decompress_ptr cinfo) 773e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Save an APPn or COM marker into the marker list */ 774e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 775e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 776e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_saved_marker_ptr cur_marker = marker->cur_marker; 777e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int bytes_read, data_length; 778e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JOCTET FAR * data; 779e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length = 0; 780e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 781e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 782e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cur_marker == NULL) { 783e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* begin reading a marker */ 784e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 785e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 786e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length >= 0) { /* watch out for bogus length word */ 787e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* figure out how much we want to save */ 788e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int limit; 789e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->unread_marker == (int) M_COM) 790e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov limit = marker->length_limit_COM; 791e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 792e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0]; 793e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if ((unsigned int) length < limit) 794e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov limit = (unsigned int) length; 795e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* allocate and initialize the marker item */ 796e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cur_marker = (jpeg_saved_marker_ptr) 797e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 798e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov SIZEOF(struct jpeg_marker_struct) + limit); 799e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cur_marker->next = NULL; 800e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cur_marker->marker = (UINT8) cinfo->unread_marker; 801e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cur_marker->original_length = (unsigned int) length; 802e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cur_marker->data_length = limit; 803e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* data area is just beyond the jpeg_marker_struct */ 804e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1); 805e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->cur_marker = cur_marker; 806e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->bytes_read = 0; 807e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_read = 0; 808e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data_length = limit; 809e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 810e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* deal with bogus length word */ 811e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_read = data_length = 0; 812e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data = NULL; 813e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 814e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 815e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* resume reading a marker */ 816e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_read = marker->bytes_read; 817e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data_length = cur_marker->data_length; 818e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data = cur_marker->data + bytes_read; 819e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 820e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 821e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (bytes_read < data_length) { 822e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); /* move the restart point to here */ 823e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->bytes_read = bytes_read; 824e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* If there's not at least one byte in buffer, suspend */ 825e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAKE_BYTE_AVAIL(cinfo, return FALSE); 826e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Copy bytes with reasonable rapidity */ 827e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (bytes_read < data_length && bytes_in_buffer > 0) { 828e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov *data++ = *next_input_byte++; 829e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_in_buffer--; 830e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov bytes_read++; 831e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 832e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 833e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 834e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Done reading what we want to read */ 835e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cur_marker != NULL) { /* will be NULL if bogus length word */ 836e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Add new marker to end of list */ 837e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->marker_list == NULL) { 838e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker_list = cur_marker; 839e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 840e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_saved_marker_ptr prev = cinfo->marker_list; 841e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (prev->next != NULL) 842e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov prev = prev->next; 843e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov prev->next = cur_marker; 844e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 845e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Reset pointer & calc remaining data length */ 846e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov data = cur_marker->data; 847e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length = cur_marker->original_length - data_length; 848e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 849e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Reset to initial state for next marker */ 850e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->cur_marker = NULL; 851e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 852e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Process the marker if interesting; else just make a generic trace msg */ 853e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (cinfo->unread_marker) { 854e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP0: 855e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov examine_app0(cinfo, data, data_length, length); 856e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 857e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP14: 858e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov examine_app14(cinfo, data, data_length, length); 859e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 860e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: 861e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, 862e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (int) (data_length + length)); 863e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 864e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 865e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 866e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* skip any remaining data -- could be lots */ 867e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); /* do before skip_input_data */ 868e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length > 0) 869e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->src->skip_input_data) (cinfo, (long) length); 870e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 871e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 872e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 873e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 874e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif /* SAVE_MARKERS_SUPPORTED */ 875e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 876e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 877e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 878e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovskip_variable (j_decompress_ptr cinfo) 879e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Skip over an unknown or uninteresting variable-length marker */ 880e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 881e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INT32 length; 882e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 883e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 884e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_2BYTES(cinfo, length, return FALSE); 885e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length -= 2; 886e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 887e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length); 888e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 889e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); /* do before skip_input_data */ 890e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length > 0) 891e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->src->skip_input_data) (cinfo, (long) length); 892e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 893e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 894e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 895e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 896e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 897e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 898e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Find the next JPEG marker, save it in cinfo->unread_marker. 899e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns FALSE if had to suspend before reaching a marker; 900e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * in that case cinfo->unread_marker is unchanged. 901e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 902e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Note that the result might not be a valid marker code, 903e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * but it will never be 0 or FF. 904e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 905e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 906e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 907e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovnext_marker (j_decompress_ptr cinfo) 908e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 909e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int c; 910e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 911e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 912e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (;;) { 913e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 914e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Skip any non-FF bytes. 915e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This may look a bit inefficient, but it will not occur in a valid file. 916e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We sync after each discarded byte so that a suspending data source 917e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * can discard the byte from its buffer. 918e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 919e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (c != 0xFF) { 920e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->discarded_bytes++; 921e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 922e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 923e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 924e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* This loop swallows any duplicate FF bytes. Extra FFs are legal as 925e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * pad bytes, so don't count them in discarded_bytes. We assume there 926e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * will not be so many consecutive FF bytes as to overflow a suspending 927e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * data source's input buffer. 928e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 929e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov do { 930e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 931e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } while (c == 0xFF); 932e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (c != 0) 933e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; /* found a valid marker, exit loop */ 934e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Reach here if we found a stuffed-zero data sequence (FF/00). 935e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Discard it and loop back to try again. 936e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 937e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->discarded_bytes += 2; 938e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 939e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 940e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 941e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->marker->discarded_bytes != 0) { 942e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c); 943e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->discarded_bytes = 0; 944e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 945e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 946e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = c; 947e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 948e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 949e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 950e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 951e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 952e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 953e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(boolean) 954e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovfirst_marker (j_decompress_ptr cinfo) 955e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Like next_marker, but used to obtain the initial SOI marker. */ 956e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* For this marker, we do not allow preceding garbage or fill; otherwise, 957e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * we might well scan an entire input file before realizing it ain't JPEG. 958e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * If an application wants to process non-JFIF files, it must seek to the 959e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * SOI before calling the JPEG library. 960e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 961e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 962e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int c, c2; 963e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_VARS(cinfo); 964e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 965e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c, return FALSE); 966e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_BYTE(cinfo, c2, return FALSE); 967e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (c != 0xFF || c2 != (int) M_SOI) 968e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT2(cinfo, JERR_NO_SOI, c, c2); 969e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 970e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = c2; 971e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 972e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov INPUT_SYNC(cinfo); 973e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 974e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 975e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 976e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 977e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 978e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Read markers until SOS or EOI. 979e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 980e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns same codes as are defined for jpeg_consume_input: 981e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. 982e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 983e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 984e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(int) 985e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovread_markers (j_decompress_ptr cinfo) 986e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 987e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Outer loop repeats once for each marker. */ 988e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (;;) { 989e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Collect the marker proper, unless we already did. */ 990e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* NB: first_marker() enforces the requirement that SOI appear first. */ 991e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->unread_marker == 0) { 992e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! cinfo->marker->saw_SOI) { 993e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! first_marker(cinfo)) 994e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 995e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 996e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! next_marker(cinfo)) 997e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 998e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 999e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1000e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* At this point cinfo->unread_marker contains the marker code and the 1001e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * input point is just past the marker proper, but before any parameters. 1002e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * A suspension will cause us to return with this state still true. 1003e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1004e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (cinfo->unread_marker) { 1005e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOI: 1006e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_soi(cinfo)) 1007e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1008e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1009e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1010e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF0: /* Baseline */ 1011e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF1: /* Extended sequential, Huffman */ 1012e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_sof(cinfo, FALSE, FALSE)) 1013e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1014e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1015e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1016e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF2: /* Progressive, Huffman */ 1017e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_sof(cinfo, TRUE, FALSE)) 1018e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1019e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1020e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1021e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF9: /* Extended sequential, arithmetic */ 1022e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_sof(cinfo, FALSE, TRUE)) 1023e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1024e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1025e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1026e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF10: /* Progressive, arithmetic */ 1027e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_sof(cinfo, TRUE, TRUE)) 1028e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1029e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1030e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1031e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Currently unsupported SOFn types */ 1032e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF3: /* Lossless, Huffman */ 1033e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF5: /* Differential sequential, Huffman */ 1034e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF6: /* Differential progressive, Huffman */ 1035e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF7: /* Differential lossless, Huffman */ 1036e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_JPG: /* Reserved for JPEG extensions */ 1037e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF11: /* Lossless, arithmetic */ 1038e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF13: /* Differential sequential, arithmetic */ 1039e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF14: /* Differential progressive, arithmetic */ 1040e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOF15: /* Differential lossless, arithmetic */ 1041e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker); 1042e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1043e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1044e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_SOS: 1045e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_sos(cinfo)) 1046e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1047e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; /* processed the marker */ 1048e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_REACHED_SOS; 1049e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1050e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_EOI: 1051e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS(cinfo, 1, JTRC_EOI); 1052e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; /* processed the marker */ 1053e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_REACHED_EOI; 1054e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1055e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_DAC: 1056e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_dac(cinfo)) 1057e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1058e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1059e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1060e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_DHT: 1061e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_dht(cinfo)) 1062e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1063e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1064e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1065e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_DQT: 1066e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_dqt(cinfo)) 1067e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1068e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1069e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1070e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_DRI: 1071e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! get_dri(cinfo)) 1072e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1073e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1074e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1075e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP0: 1076e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP1: 1077e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP2: 1078e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP3: 1079e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP4: 1080e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP5: 1081e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP6: 1082e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP7: 1083e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP8: 1084e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP9: 1085e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP10: 1086e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP11: 1087e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP12: 1088e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP13: 1089e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP14: 1090e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_APP15: 1091e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[ 1092e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker - (int) M_APP0]) (cinfo)) 1093e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1094e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1095e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1096e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_COM: 1097e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo)) 1098e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1099e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1100e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1101e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST0: /* these are all parameterless */ 1102e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST1: 1103e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST2: 1104e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST3: 1105e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST4: 1106e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST5: 1107e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST6: 1108e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_RST7: 1109e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_TEM: 1110e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker); 1111e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1112e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1113e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case M_DNL: /* Ignore DNL ... perhaps the wrong thing */ 1114e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! skip_variable(cinfo)) 1115e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return JPEG_SUSPENDED; 1116e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1117e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1118e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: /* must be DHP, EXP, JPGn, or RESn */ 1119e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For now, we treat the reserved markers as fatal errors since they are 1120e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * likely to be used to signal incompatible JPEG Part 3 extensions. 1121e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Once the JPEG 3 version-number marker is well defined, this code 1122e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * ought to change! 1123e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1124e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); 1125e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1126e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1127e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Successfully processed marker, so reset state variable */ 1128e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; 1129e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } /* end loop */ 1130e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1131e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1132e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1133e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1134e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Read a restart marker, which is expected to appear next in the datastream; 1135e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * if the marker is not there, take appropriate recovery action. 1136e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns FALSE if suspension is required. 1137e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 1138e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This is called by the entropy decoder after it has read an appropriate 1139e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * number of MCUs. cinfo->unread_marker may be nonzero if the entropy decoder 1140e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * has already read a marker from the data source. Under normal conditions 1141e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * cinfo->unread_marker will be reset to 0 before returning; if not reset, 1142e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * it holds a marker which the decoder will be unable to read past. 1143e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1144e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1145e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 1146e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovread_restart_marker (j_decompress_ptr cinfo) 1147e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1148e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Obtain a marker unless we already did. */ 1149e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Note that next_marker will complain if it skips any data. */ 1150e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->unread_marker == 0) { 1151e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! next_marker(cinfo)) 1152e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return FALSE; 1153e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1154e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1155e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->unread_marker == 1156e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((int) M_RST0 + cinfo->marker->next_restart_num)) { 1157e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Normal case --- swallow the marker and let entropy decoder continue */ 1158e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num); 1159e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; 1160e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 1161e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Uh-oh, the restart markers have been messed up. */ 1162e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Let the data source manager determine how to resync. */ 1163e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*cinfo->src->resync_to_restart) (cinfo, 1164e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->next_restart_num)) 1165e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return FALSE; 1166e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1167e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1168e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Update next-restart state */ 1169e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7; 1170e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1171e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 1172e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1173e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1174e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1175e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1176e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This is the default resync_to_restart method for data source managers 1177e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * to use if they don't have any better approach. Some data source managers 1178e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * may be able to back up, or may have additional knowledge about the data 1179e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * which permits a more intelligent recovery strategy; such managers would 1180e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * presumably supply their own resync method. 1181e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 1182e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * read_restart_marker calls resync_to_restart if it finds a marker other than 1183e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the restart marker it was expecting. (This code is *not* used unless 1184e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * a nonzero restart interval has been declared.) cinfo->unread_marker is 1185e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the marker code actually found (might be anything, except 0 or FF). 1186e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * The desired restart marker number (0..7) is passed as a parameter. 1187e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This routine is supposed to apply whatever error recovery strategy seems 1188e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * appropriate in order to position the input stream to the next data segment. 1189e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Note that cinfo->unread_marker is treated as a marker appearing before 1190e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the current data-source input point; usually it should be reset to zero 1191e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * before returning. 1192e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns FALSE if suspension is required. 1193e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 1194e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This implementation is substantially constrained by wanting to treat the 1195e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * input as a data stream; this means we can't back up. Therefore, we have 1196e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * only the following actions to work with: 1197e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 1. Simply discard the marker and let the entropy decoder resume at next 1198e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * byte of file. 1199e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 2. Read forward until we find another marker, discarding intervening 1200e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * data. (In theory we could look ahead within the current bufferload, 1201e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * without having to discard data if we don't find the desired marker. 1202e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This idea is not implemented here, in part because it makes behavior 1203e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * dependent on buffer size and chance buffer-boundary positions.) 1204e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 3. Leave the marker unread (by failing to zero cinfo->unread_marker). 1205e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This will cause the entropy decoder to process an empty data segment, 1206e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * inserting dummy zeroes, and then we will reprocess the marker. 1207e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 1208e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * #2 is appropriate if we think the desired marker lies ahead, while #3 is 1209e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * appropriate if the found marker is a future restart marker (indicating 1210e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * that we have missed the desired restart marker, probably because it got 1211e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * corrupted). 1212e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We apply #2 or #3 if the found marker is a restart marker no more than 1213e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * two counts behind or ahead of the expected one. We also apply #2 if the 1214e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * found marker is not a legal JPEG marker code (it's certainly bogus data). 1215e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * If the found marker is a restart marker more than 2 counts away, we do #1 1216e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * (too much risk that the marker is erroneous; with luck we will be able to 1217e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * resync at some future point). 1218e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * For any valid non-restart JPEG marker, we apply #3. This keeps us from 1219e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * overrunning the end of a scan. An implementation limited to single-scan 1220e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * files might find it better to apply #2 for markers other than EOI, since 1221e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * any other marker would have to be bogus data in that case. 1222e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1223e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1224e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(boolean) 1225e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjpeg_resync_to_restart (j_decompress_ptr cinfo, int desired) 1226e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1227e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int marker = cinfo->unread_marker; 1228e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int action = 1; 1229e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1230e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Always put up a warning. */ 1231e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired); 1232e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1233e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Outer loop handles repeated decision after scanning forward. */ 1234e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (;;) { 1235e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker < (int) M_SOF0) 1236e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov action = 2; /* invalid marker */ 1237e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else if (marker < (int) M_RST0 || marker > (int) M_RST7) 1238e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov action = 3; /* valid non-restart marker */ 1239e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else { 1240e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker == ((int) M_RST0 + ((desired+1) & 7)) || 1241e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker == ((int) M_RST0 + ((desired+2) & 7))) 1242e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov action = 3; /* one of the next two expected restarts */ 1243e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else if (marker == ((int) M_RST0 + ((desired-1) & 7)) || 1244e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker == ((int) M_RST0 + ((desired-2) & 7))) 1245e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov action = 2; /* a prior restart, so advance */ 1246e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 1247e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov action = 1; /* desired restart or too far away */ 1248e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1249e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action); 1250e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (action) { 1251e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 1: 1252e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Discard marker and let entropy decoder resume processing. */ 1253e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; 1254e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 1255e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 2: 1256e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Scan to the next marker, and repeat the decision loop. */ 1257e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! next_marker(cinfo)) 1258e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return FALSE; 1259e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker = cinfo->unread_marker; 1260e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 1261e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case 3: 1262e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Return without advancing past this marker. */ 1263e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Entropy decoder will be forced to process an empty segment. */ 1264e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 1265e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1266e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } /* end loop */ 1267e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1268e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1269e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1270e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1271e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Reset marker processing state to begin a fresh datastream. 1272e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1273e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1274e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(void) 1275e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovreset_marker_reader (j_decompress_ptr cinfo) 1276e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1277e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 1278e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1279e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->comp_info = NULL; /* until allocated by get_sof */ 1280e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->input_scan_number = 0; /* no SOS seen yet */ 1281e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->unread_marker = 0; /* no pending marker */ 1282e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.saw_SOI = FALSE; /* set internal state too */ 1283e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.saw_SOF = FALSE; 1284e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.discarded_bytes = 0; 1285e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->cur_marker = NULL; 1286e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1287e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1288e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1289e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1290e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Initialize the marker reader module. 1291e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This is called only once, when the decompression object is created. 1292e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1293e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1294e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(void) 1295e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjinit_marker_reader (j_decompress_ptr cinfo) 1296e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1297e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_marker_ptr marker; 1298e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i; 1299e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1300e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Create subobject in permanent pool */ 1301e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker = (my_marker_ptr) 1302e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, 1303e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov SIZEOF(my_marker_reader)); 1304e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->marker = (struct jpeg_marker_reader *) marker; 1305e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Initialize public method pointers */ 1306e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.reset_marker_reader = reset_marker_reader; 1307e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.read_markers = read_markers; 1308e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->pub.read_restart_marker = read_restart_marker; 1309e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Initialize COM/APPn processing. 1310e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * By default, we examine and then discard APP0 and APP14, 1311e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * but simply discard COM and all other APPn. 1312e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1313e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_COM = skip_variable; 1314e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->length_limit_COM = 0; 1315e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < 16; i++) { 1316e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_APPn[i] = skip_variable; 1317e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->length_limit_APPn[i] = 0; 1318e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1319e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_APPn[0] = get_interesting_appn; 1320e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_APPn[14] = get_interesting_appn; 1321e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Reset marker processing state */ 1322e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov reset_marker_reader(cinfo); 1323e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1324e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1325e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1326e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1327e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Control saving of COM and APPn markers into marker_list. 1328e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1329e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1330e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef SAVE_MARKERS_SUPPORTED 1331e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1332e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(void) 1333e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjpeg_save_markers (j_decompress_ptr cinfo, int marker_code, 1334e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov unsigned int length_limit) 1335e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1336e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 1337e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov long maxlength; 1338e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_marker_parser_method processor; 1339e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1340e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Length limit mustn't be larger than what we can allocate 1341e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * (should only be a concern in a 16-bit environment). 1342e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1343e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct); 1344e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (((long) length_limit) > maxlength) 1345e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length_limit = (unsigned int) maxlength; 1346e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1347e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Choose processor routine to use. 1348e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * APP0/APP14 have special requirements. 1349e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1350e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (length_limit) { 1351e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov processor = save_marker; 1352e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* If saving APP0/APP14, save at least enough for our internal use. */ 1353e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN) 1354e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length_limit = APP0_DATA_LEN; 1355e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN) 1356e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov length_limit = APP14_DATA_LEN; 1357e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 1358e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov processor = skip_variable; 1359e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* If discarding APP0/APP14, use our regular on-the-fly processor. */ 1360e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14) 1361e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov processor = get_interesting_appn; 1362e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 1363e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1364e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker_code == (int) M_COM) { 1365e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_COM = processor; 1366e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->length_limit_COM = length_limit; 1367e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) { 1368e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_APPn[marker_code - (int) M_APP0] = processor; 1369e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit; 1370e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else 1371e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); 1372e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1373e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1374e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif /* SAVE_MARKERS_SUPPORTED */ 1375e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1376e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1377e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 1378e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Install a special processing method for COM or APPn markers. 1379e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 1380e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1381e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(void) 1382e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code, 1383e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_marker_parser_method routine) 1384e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 1385e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 1386e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 1387e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (marker_code == (int) M_COM) 1388e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_COM = routine; 1389e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) 1390e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov marker->process_APPn[marker_code - (int) M_APP0] = routine; 1391e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 1392e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); 1393e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 1394