19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rdjpgcom.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1997, Thomas G. Lane. 59f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file is part of the Independent JPEG Group's software. 69f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For conditions of distribution and use, see the accompanying README file. 79f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 89f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file contains a very simple stand-alone application that displays 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the text in COM (comment) markers in a JFIF file. 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This may be useful as an example of the minimum logic needed to parse 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * JPEG markers. 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_CJPEG_DJPEG /* to get the command-line config symbols */ 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" /* get auto-config symbols, <stdio.h> */ 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <ctype.h> /* to declare isupper(), tolower() */ 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_SETMODE 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <fcntl.h> /* to declare setmode()'s parameter macros */ 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* If you have setmode() but not <io.h>, just delete this line: */ 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <io.h> /* to declare setmode() */ 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_CCOMMAND /* command-line reader for Macintosh */ 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef __MWERKS__ 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <SIOUX.h> /* Metrowerks needs this */ 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <console.h> /* ... and this */ 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef THINK_C 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include <console.h> /* Think declares it here */ 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */ 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define READ_BINARY "r" 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef VMS /* VMS is very nonstandard */ 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define READ_BINARY "rb", "ctx=stm" 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else /* standard ANSI-compliant case */ 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define READ_BINARY "rb" 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef EXIT_FAILURE /* define exit() codes if not provided */ 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define EXIT_FAILURE 1 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef EXIT_SUCCESS 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef VMS 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define EXIT_SUCCESS 1 /* VMS is very nonstandard */ 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define EXIT_SUCCESS 0 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These macros are used to read the input file. 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To reuse this code in another application, you might need to change these. 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic FILE * infile; /* input JPEG file */ 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Return next input byte, or EOF if no more */ 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define NEXTBYTE() getc(infile) 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Error exit handler */ 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define ERREXIT(msg) (fprintf(stderr, "%s\n", msg), exit(EXIT_FAILURE)) 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Read one byte, testing for EOF */ 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic int 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectread_1_byte (void) 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c; 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c = NEXTBYTE(); 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c == EOF) 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Premature EOF in JPEG file"); 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return c; 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Read 2 bytes, convert to unsigned int */ 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* All 2-byte quantities in JPEG markers are MSB first */ 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic unsigned int 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectread_2_bytes (void) 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c1, c2; 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 = NEXTBYTE(); 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c1 == EOF) 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Premature EOF in JPEG file"); 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 = NEXTBYTE(); 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c2 == EOF) 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Premature EOF in JPEG file"); 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return (((unsigned int) c1) << 8) + ((unsigned int) c2); 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * JPEG markers consist of one or more 0xFF bytes, followed by a marker 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * code byte (which is not an FF). Here are the marker codes of interest 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in this program. (See jdmarker.c for a more complete list.) 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF0 0xC0 /* Start Of Frame N */ 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF1 0xC1 /* N indicates which compression process */ 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use */ 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF3 0xC3 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers */ 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF6 0xC6 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF7 0xC7 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF9 0xC9 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF10 0xCA 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF11 0xCB 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF13 0xCD 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF14 0xCE 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOF15 0xCF 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */ 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_EOI 0xD9 /* End Of Image (end of datastream) */ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_SOS 0xDA /* Start Of Scan (begins compressed data) */ 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_APP0 0xE0 /* Application-specific marker, type N */ 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_APP12 0xEC /* (we don't bother to list all 16 APPn's) */ 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define M_COM 0xFE /* COMment */ 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Find the next JPEG marker and return its marker code. 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We expect at least one FF byte, possibly more if the compressor used FFs 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to pad the file. 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * There could also be non-FF garbage between markers. The treatment of such 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * garbage is unspecified; we choose to skip over it but emit a warning msg. 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NB: this routine must not be used after seeing SOS marker, since it will 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * not deal correctly with FF/00 sequences in the compressed image data... 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic int 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectnext_marker (void) 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c; 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int discarded_bytes = 0; 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Find 0xFF byte; count and skip any non-FFs. */ 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c = read_1_byte(); 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (c != 0xFF) { 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project discarded_bytes++; 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c = read_1_byte(); 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get marker code byte, swallowing any duplicate FF bytes. Extra FFs 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are legal as pad bytes, so don't count them in discarded_bytes. 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project do { 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c = read_1_byte(); 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } while (c == 0xFF); 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (discarded_bytes != 0) { 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "Warning: garbage data found in JPEG file\n"); 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return c; 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Read the initial marker, which should be SOI. 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For a JFIF file, the first two bytes of the file should be literally 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 0xFF M_SOI. To be more general, we could use next_marker, but if the 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * input file weren't actually JPEG at all, next_marker might read the whole 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * file and then return a misleading error message... 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic int 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfirst_marker (void) 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c1, c2; 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 = NEXTBYTE(); 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 = NEXTBYTE(); 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c1 != 0xFF || c2 != M_SOI) 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Not a JPEG file"); 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return c2; 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Most types of marker are followed by a variable-length parameter segment. 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This routine skips over the parameters for any marker we don't otherwise 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * want to process. 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note that we MUST skip the parameter segment explicitly in order not to 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * be fooled by 0xFF bytes that might appear within the parameter segment; 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * such bytes do NOT introduce new markers. 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic void 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectskip_variable (void) 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Skip over an unknown or uninteresting variable-length marker */ 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int length; 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get the marker parameter length count */ 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length = read_2_bytes(); 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Length includes itself, so must be at least 2 */ 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (length < 2) 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Erroneous JPEG marker length"); 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length -= 2; 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Skip over the remaining bytes */ 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (length > 0) { 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (void) read_1_byte(); 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length--; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Process a COM marker. 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We want to print out the marker contents as legible text; 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * we must guard against non-text junk and varying newline representations. 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic void 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprocess_COM (void) 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int length; 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ch; 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int lastch = 0; 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get the marker parameter length count */ 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length = read_2_bytes(); 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Length includes itself, so must be at least 2 */ 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (length < 2) 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Erroneous JPEG marker length"); 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length -= 2; 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (length > 0) { 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ch = read_1_byte(); 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit the character in a readable form. 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Nonprintables are converted to \nnn form, 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * while \ is converted to \\. 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Newlines in CR, CR/LF, or LF form will be printed as one newline. 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (ch == '\r') { 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("\n"); 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (ch == '\n') { 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (lastch != '\r') 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("\n"); 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (ch == '\\') { 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("\\\\"); 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (isprint(ch)) { 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project putc(ch, stdout); 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("\\%03o", ch); 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lastch = ch; 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length--; 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("\n"); 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Process a SOFn marker. 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This code is only needed if you want to know the image dimensions... 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic void 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprocess_SOFn (int marker) 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int length; 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int image_height, image_width; 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int data_precision, num_components; 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project const char * process; 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci; 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project length = read_2_bytes(); /* usual parameter length count */ 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project data_precision = read_1_byte(); 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project image_height = read_2_bytes(); 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project image_width = read_2_bytes(); 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num_components = read_1_byte(); 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project switch (marker) { 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF0: process = "Baseline"; break; 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF1: process = "Extended sequential"; break; 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF2: process = "Progressive"; break; 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF3: process = "Lossless"; break; 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF5: process = "Differential sequential"; break; 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF6: process = "Differential progressive"; break; 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF7: process = "Differential lossless"; break; 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF9: process = "Extended sequential, arithmetic coding"; break; 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF10: process = "Progressive, arithmetic coding"; break; 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF11: process = "Lossless, arithmetic coding"; break; 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF13: process = "Differential sequential, arithmetic coding"; break; 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF14: process = "Differential progressive, arithmetic coding"; break; 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF15: process = "Differential lossless, arithmetic coding"; break; 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project default: process = "Unknown"; break; 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("JPEG image is %uw * %uh, %d color components, %d bits per sample\n", 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project image_width, image_height, num_components, data_precision); 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("JPEG process: %s\n", process); 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (length != (unsigned int) (8 + num_components * 3)) 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Bogus SOF marker length"); 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < num_components; ci++) { 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (void) read_1_byte(); /* Component ID code */ 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (void) read_1_byte(); /* H, V sampling factors */ 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (void) read_1_byte(); /* Quantization table number */ 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Parse the marker stream until SOS or EOI is seen; 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * display any COM markers. 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * While the companion program wrjpgcom will always insert COM markers before 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * SOFn, other implementations might not, so we scan to SOS before stopping. 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If we were only interested in the image dimensions, we would stop at SOFn. 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (Conversely, if we only cared about COM markers, there would be no need 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for special code to handle SOFn; we could treat it like other markers.) 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic int 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectscan_JPEG_header (int verbose) 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int marker; 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Expect SOI at start of file */ 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (first_marker() != M_SOI) 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT("Expected SOI marker first"); 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Scan miscellaneous markers until we reach SOS. */ 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (;;) { 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project marker = next_marker(); 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project switch (marker) { 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note that marker codes 0xC4, 0xC8, 0xCC are not, and must not be, 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * treated as SOFn. C4 in particular is actually DHT. 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF0: /* Baseline */ 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF1: /* Extended sequential, Huffman */ 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF2: /* Progressive, Huffman */ 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF3: /* Lossless, Huffman */ 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF5: /* Differential sequential, Huffman */ 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF6: /* Differential progressive, Huffman */ 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF7: /* Differential lossless, Huffman */ 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF9: /* Extended sequential, arithmetic */ 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF10: /* Progressive, arithmetic */ 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF11: /* Lossless, arithmetic */ 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF13: /* Differential sequential, arithmetic */ 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF14: /* Differential progressive, arithmetic */ 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOF15: /* Differential lossless, arithmetic */ 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (verbose) 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project process_SOFn(marker); 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project skip_variable(); 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_SOS: /* stop before hitting compressed data */ 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return marker; 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_EOI: /* in case it's a tables-only JPEG stream */ 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return marker; 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_COM: 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project process_COM(); 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case M_APP12: 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Some digital camera makers put useful textual information into 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * APP12 markers, so we print those out too when in -verbose mode. 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (verbose) { 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project printf("APP12 contains:\n"); 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project process_COM(); 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project skip_variable(); 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project default: /* Anything else just gets skipped */ 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project skip_variable(); /* we assume it has a parameter count... */ 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } /* end loop */ 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Command line parsing code */ 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic const char * progname; /* program name for error messages */ 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic void 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectusage (void) 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* complain about bad command line */ 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "rdjpgcom displays any textual comments in a JPEG file.\n"); 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "Usage: %s [switches] [inputfile]\n", progname); 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "Switches (names may be abbreviated):\n"); 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, " -verbose Also display dimensions of JPEG image\n"); 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project exit(EXIT_FAILURE); 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstatic int 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectkeymatch (char * arg, const char * keyword, int minchars) 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Case-insensitive matching of (possibly abbreviated) keyword switches. */ 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* keyword is the constant keyword (must be lower case already), */ 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* minchars is length of minimum legal abbreviation. */ 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int ca, ck; 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int nmatched = 0; 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while ((ca = *arg++) != '\0') { 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((ck = *keyword++) == '\0') 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; /* arg longer than keyword, no good */ 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (isupper(ca)) /* force arg to lcase (assume ck is already) */ 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ca = tolower(ca); 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (ca != ck) 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; /* no good */ 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nmatched++; /* count matched characters */ 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* reached end of argument; fail if it's too short for unique abbrev */ 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nmatched < minchars) 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 1; /* A-OK */ 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The main program. 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectint 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectmain (int argc, char **argv) 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int argn; 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project char * arg; 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int verbose = 0; 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* On Mac, fetch a command line. */ 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_CCOMMAND 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project argc = ccommand(&argv); 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project progname = argv[0]; 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (progname == NULL || progname[0] == 0) 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project progname = "rdjpgcom"; /* in case C library doesn't provide it */ 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Parse switches, if any */ 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (argn = 1; argn < argc; argn++) { 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project arg = argv[argn]; 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (arg[0] != '-') 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; /* not switch, must be file name */ 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project arg++; /* advance over '-' */ 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (keymatch(arg, "verbose", 1)) { 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project verbose++; 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project usage(); 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Open the input file. */ 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Unix style: expect zero or one file name */ 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (argn < argc-1) { 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "%s: only one input file\n", progname); 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project usage(); 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (argn < argc) { 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((infile = fopen(argv[argn], READ_BINARY)) == NULL) { 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project exit(EXIT_FAILURE); 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* default input file is stdin */ 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_SETMODE /* need to hack file mode? */ 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project setmode(fileno(stdin), O_BINARY); 4799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 4809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_FDOPEN /* need to re-open in binary mode? */ 4819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((infile = fdopen(fileno(stdin), READ_BINARY)) == NULL) { 4829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fprintf(stderr, "%s: can't open stdin\n", progname); 4839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project exit(EXIT_FAILURE); 4849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 4869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project infile = stdin; 4879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 4889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Scan the JPEG headers. */ 4919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (void) scan_JPEG_header(verbose); 4929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* All done. */ 4949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project exit(EXIT_SUCCESS); 4959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; /* suppress no-return-value warnings */ 4969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 497