170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jdinput.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1991-1997, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains input control logic for the JPEG decompressor. 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * These routines are concerned with controlling the decompressor's input 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * processing (marker reading and coefficient decoding). The actual input 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * reading is done in jdmarker.c, jdhuff.c, and jdphuff.c. 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Private state */ 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef struct { 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine struct jpeg_input_controller pub; /* public fields */ 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine boolean inheaders; /* TRUE until first SOS is reached */ 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} my_input_controller; 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef my_input_controller * my_inputctl_ptr; 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Forward declarations */ 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(int) consume_markers JPP((j_decompress_ptr cinfo)); 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(int) consume_markers_with_huffman_index JPP((j_decompress_ptr cinfo, 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine huffman_index *index, int current_scan)); 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Routines to calculate various quantities related to the size of the image. 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineinitial_setup (j_decompress_ptr cinfo) 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Called once, when first SOS marker is reached */ 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci; 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info *compptr; 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Make sure image isn't bigger than I can handle */ 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION || 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION) 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For now, precision must match compiled-in value... */ 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->data_precision != BITS_IN_JSAMPLE) 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check that number of components won't exceed internal array sizes */ 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->num_components > MAX_COMPONENTS) 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MAX_COMPONENTS); 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Compute maximum sampling factors; check factor validity */ 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->max_h_samp_factor = 1; 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->max_v_samp_factor = 1; 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ci++, compptr++) { 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR || 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR) 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_BAD_SAMPLING); 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor, 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->h_samp_factor); 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor, 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->v_samp_factor); 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE. 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * In the full decompressor, this will be overridden by jdmaster.c; 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * but in the transcoder, jdmaster.c is not used, so we must do it here. 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->min_DCT_scaled_size = DCTSIZE; 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Compute dimensions of components */ 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ci++, compptr++) { 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->DCT_scaled_size = DCTSIZE; 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Size in DCT blocks */ 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->width_in_blocks = (JDIMENSION) 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) (cinfo->max_h_samp_factor * DCTSIZE)); 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->height_in_blocks = (JDIMENSION) 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) (cinfo->max_v_samp_factor * DCTSIZE)); 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* downsampled_width and downsampled_height will also be overridden by 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jdmaster.c if we are doing full decompression. The transcoder library 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * doesn't use these values, but the calling application might. 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Size in samples */ 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->downsampled_width = (JDIMENSION) 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) cinfo->max_h_samp_factor); 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->downsampled_height = (JDIMENSION) 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) cinfo->max_v_samp_factor); 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Mark component needed, until color conversion says otherwise */ 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->component_needed = TRUE; 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Mark no quantization table yet saved for component */ 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->quant_table = NULL; 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Compute number of fully interleaved MCU rows. */ 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->total_iMCU_rows = (JDIMENSION) 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_height, 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) (cinfo->max_v_samp_factor*DCTSIZE)); 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Decide whether file contains multiple scans */ 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode) 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->has_multiple_scans = TRUE; 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->has_multiple_scans = FALSE; 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->original_image_width = cinfo->image_width; 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineper_scan_setup (j_decompress_ptr cinfo) 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Do computations that are needed before processing a JPEG scan */ 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* cinfo->comps_in_scan and cinfo->cur_comp_info[] were set from SOS marker */ 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci, mcublks, tmp; 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info *compptr; 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->comps_in_scan == 1) { 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Noninterleaved (single-component) scan */ 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[0]; 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Overall image size in MCUs */ 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCUs_per_row = compptr->width_in_blocks; 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCU_rows_in_scan = compptr->height_in_blocks; 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For noninterleaved scan, always one block per MCU */ 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_width = 1; 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_height = 1; 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_blocks = 1; 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_sample_width = compptr->DCT_scaled_size; 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->last_col_width = 1; 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For noninterleaved scans, it is convenient to define last_row_height 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * as the number of block rows present in the last iMCU row. 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tmp == 0) tmp = compptr->v_samp_factor; 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->last_row_height = tmp; 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Prepare array describing MCU composition */ 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->blocks_in_MCU = 1; 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCU_membership[0] = 0; 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Interleaved (multi-component) scan */ 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN) 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan, 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MAX_COMPS_IN_SCAN); 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Overall image size in MCUs */ 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCUs_per_row = (JDIMENSION) 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_width, 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) (cinfo->max_h_samp_factor*DCTSIZE)); 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCU_rows_in_scan = (JDIMENSION) 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jdiv_round_up((long) cinfo->image_height, 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (long) (cinfo->max_v_samp_factor*DCTSIZE)); 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->blocks_in_MCU = 0; 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Sampling factors give # of blocks of component in each MCU */ 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_width = compptr->h_samp_factor; 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_height = compptr->v_samp_factor; 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height; 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_scaled_size; 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Figure number of non-dummy blocks in last MCU column & row */ 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp = (int) (compptr->width_in_blocks % compptr->MCU_width); 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tmp == 0) tmp = compptr->MCU_width; 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->last_col_width = tmp; 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef ANDROID_TILE_BASED_DECODE 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->tile_decode) { 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp = (int) (jdiv_round_up(cinfo->image_width, 8) 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine % compptr->MCU_width); 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tmp == 0) tmp = compptr->MCU_width; 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->last_col_width = tmp; 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp = (int) (compptr->height_in_blocks % compptr->MCU_height); 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tmp == 0) tmp = compptr->MCU_height; 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->last_row_height = tmp; 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Prepare array describing MCU composition */ 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine mcublks = compptr->MCU_blocks; 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU) 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_BAD_MCU_SIZE); 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (mcublks-- > 0) { 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci; 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_decompress_per_scan_setup(j_decompress_ptr cinfo) 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine per_scan_setup(cinfo); 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Save away a copy of the Q-table referenced by each component present 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * in the current scan, unless already saved during a prior scan. 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * In a multiple-scan JPEG file, the encoder could assign different components 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the same Q-table slot number, but change table definitions between scans 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * so that each component uses a different Q-table. (The IJG encoder is not 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * currently capable of doing this, but other encoders might.) Since we want 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to be able to dequantize all the components at the end of the file, this 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * means that we have to save away the table actually used for each component. 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We do this by copying the table at the start of the first scan containing 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the component. 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The JPEG spec prohibits the encoder from changing the contents of a Q-table 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * slot between scans of a component using that slot. If the encoder does so 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * anyway, this decoder will simply use the Q-table values that were current 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * at the start of the first scan for the component. 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The decompressor output side looks only at the saved quant tables, 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * not at the current Q-table slots. 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinelatch_quant_tables (j_decompress_ptr cinfo) 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci, qtblno; 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info *compptr; 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JQUANT_TBL * qtbl; 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* No work if we already saved Q-table for this component */ 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (compptr->quant_table != NULL) 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Make sure specified quantization table is present */ 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine qtblno = compptr->quant_tbl_no; 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS || 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->quant_tbl_ptrs[qtblno] == NULL) 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno); 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* OK, save away the quantization table */ 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine qtbl = (JQUANT_TBL *) 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SIZEOF(JQUANT_TBL)); 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MEMCOPY(qtbl, cinfo->quant_tbl_ptrs[qtblno], SIZEOF(JQUANT_TBL)); 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr->quant_table = qtbl; 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize the input modules to read a scan of compressed data. 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The first call to this is done by jdmaster.c after initializing 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the entire decompressor (during jpeg_start_decompress). 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Subsequent calls come from consume_markers, below. 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 27270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinestart_input_pass (j_decompress_ptr cinfo) 27370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 27470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine per_scan_setup(cinfo); 27570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine latch_quant_tables(cinfo); 27670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->entropy->start_pass) (cinfo); 27770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->coef->start_input_pass) (cinfo); 27870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->consume_input = cinfo->coef->consume_data; 27970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->consume_input_build_huffman_index = 28070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->coef->consume_data_build_huffman_index; 28170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 28270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 28370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 28470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 28570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Finish up after inputting a compressed-data scan. 28670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This is called by the coefficient controller after it's read all 28770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the expected data of the scan. 28870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 28970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 29170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinefinish_input_pass (j_decompress_ptr cinfo) 29270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 29370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->consume_input = consume_markers; 29470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl->consume_input_build_huffman_index = 29570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine consume_markers_with_huffman_index; 29670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 29770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(int) 30070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineconsume_markers_with_huffman_index (j_decompress_ptr cinfo, 30170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine huffman_index *index, int current_scan) 30270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 30370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return consume_markers(cinfo); 30470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 30570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 30670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Read JPEG markers before, between, or after compressed-data scans. 30770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Change state as necessary when a new scan is reached. 30870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. 30970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 31070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The consume_input method pointer points either here or to the 31170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * coefficient controller's consume_data routine, depending on whether 31270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * we are reading a compressed data segment or inter-segment markers. 31370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 31470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(int) 31670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineconsume_markers (j_decompress_ptr cinfo) 31770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 31870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl; 31970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int val; 32070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */ 32270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return JPEG_REACHED_EOI; 32370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine val = (*cinfo->marker->read_markers) (cinfo); 32570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine switch (val) { 32770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine case JPEG_REACHED_SOS: /* Found SOS */ 32870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (inputctl->inheaders) { /* 1st SOS */ 32970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine initial_setup(cinfo); 33070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->inheaders = FALSE; 33170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Note: start_input_pass must be called by jdmaster.c 33270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * before any more input can be consumed. jdapimin.c is 33370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * responsible for enforcing this sequencing. 33470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 33570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { /* 2nd or later SOS marker */ 33670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (! inputctl->pub.has_multiple_scans) 33770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */ 33870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine start_input_pass(cinfo); 33970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 34070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 34170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine case JPEG_REACHED_EOI: /* Found EOI */ 34270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.eoi_reached = TRUE; 34370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (inputctl->inheaders) { /* Tables-only datastream, apparently */ 34470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->marker->saw_SOF) 34570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_SOF_NO_SOS); 34670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 34770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Prevent infinite loop in coef ctlr's decompress_data routine 34870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * if user set output_scan_number larger than number of scans. 34970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 35070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->output_scan_number > cinfo->input_scan_number) 35170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->output_scan_number = cinfo->input_scan_number; 35270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 35370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 35470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine case JPEG_SUSPENDED: 35570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 35670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 35770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return val; 35970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 36070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 36170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 36270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 36370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Reset state to begin a fresh datastream. 36470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 36570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 36670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 36770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinereset_input_controller (j_decompress_ptr cinfo) 36870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 36970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl; 37070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.consume_input = consume_markers; 37270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.consume_input_build_huffman_index = 37370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine consume_markers_with_huffman_index; 37470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */ 37570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.eoi_reached = FALSE; 37670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->inheaders = TRUE; 37770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Reset other modules */ 37870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); 37970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->marker->reset_marker_reader) (cinfo); 38070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Reset progression state -- would be cleaner if entropy decoder did this */ 38170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->coef_bits = NULL; 38270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 38370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 38670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize the input controller module. 38770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This is called only once, when the decompression object is created. 38870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 38970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 39070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 39170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejinit_input_controller (j_decompress_ptr cinfo) 39270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 39370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_inputctl_ptr inputctl; 39470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 39570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Create subobject in permanent pool */ 39670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl = (my_inputctl_ptr) 39770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, 39870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SIZEOF(my_input_controller)); 39970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->inputctl = (struct jpeg_input_controller *) inputctl; 40070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize method pointers */ 40170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.consume_input = consume_markers; 40270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.reset_input_controller = reset_input_controller; 40370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.start_input_pass = start_input_pass; 40470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.finish_input_pass = finish_input_pass; 40570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 40670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.consume_markers = consume_markers_with_huffman_index; 40770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.consume_input_build_huffman_index = 40870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine consume_markers_with_huffman_index; 40970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize state: can't use reset_input_controller since we don't 41070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * want to try to reset other modules yet. 41170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 41270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */ 41370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->pub.eoi_reached = FALSE; 41470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inputctl->inheaders = TRUE; 41570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 416