| /* |
| * djpeg.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1997, Thomas G. Lane. |
| * libjpeg-turbo Modifications: |
| * Copyright (C) 2010-2011, 2013-2015, D. R. Commander. |
| * Copyright (C) 2015, Google, Inc. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * file. |
| * |
| * This file contains a command-line user interface for the JPEG decompressor. |
| * It should work on any system with Unix- or MS-DOS-style command lines. |
| * |
| * Two different command line styles are permitted, depending on the |
| * compile-time switch TWO_FILE_COMMANDLINE: |
| * djpeg [options] inputfile outputfile |
| * djpeg [options] [inputfile] |
| * In the second style, output is always to standard output, which you'd |
| * normally redirect to a file or pipe to some other program. Input is |
| * either from a named file or from standard input (typically redirected). |
| * The second style is convenient on Unix but is unhelpful on systems that |
| * don't support pipes. Also, you MUST use the first style if your system |
| * doesn't do binary I/O to stdin/stdout. |
| * To simplify script writing, the "-outfile" switch is provided. The syntax |
| * djpeg [options] -outfile outputfile inputfile |
| * works regardless of which command line style is used. |
| */ |
| |
| #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| #include "jversion.h" /* for version message */ |
| #include "jconfigint.h" |
| |
| #include <ctype.h> /* to declare isprint() */ |
| |
| #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ |
| #ifdef __MWERKS__ |
| #include <SIOUX.h> /* Metrowerks needs this */ |
| #include <console.h> /* ... and this */ |
| #endif |
| #ifdef THINK_C |
| #include <console.h> /* Think declares it here */ |
| #endif |
| #endif |
| |
| |
| /* Create the add-on message string table. */ |
| |
| #define JMESSAGE(code,string) string , |
| |
| static const char * const cdjpeg_message_table[] = { |
| #include "cderror.h" |
| NULL |
| }; |
| |
| |
| /* |
| * This list defines the known output image formats |
| * (not all of which need be supported by a given version). |
| * You can change the default output format by defining DEFAULT_FMT; |
| * indeed, you had better do so if you undefine PPM_SUPPORTED. |
| */ |
| |
| typedef enum { |
| FMT_BMP, /* BMP format (Windows flavor) */ |
| FMT_GIF, /* GIF format */ |
| FMT_OS2, /* BMP format (OS/2 flavor) */ |
| FMT_PPM, /* PPM/PGM (PBMPLUS formats) */ |
| FMT_RLE, /* RLE format */ |
| FMT_TARGA, /* Targa format */ |
| FMT_TIFF /* TIFF format */ |
| } IMAGE_FORMATS; |
| |
| #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */ |
| #define DEFAULT_FMT FMT_PPM |
| #endif |
| |
| static IMAGE_FORMATS requested_fmt; |
| |
| |
| /* |
| * Argument-parsing code. |
| * The switch parser is designed to be useful with DOS-style command line |
| * syntax, ie, intermixed switches and file names, where only the switches |
| * to the left of a given file name affect processing of that file. |
| * The main program in this file doesn't actually use this capability... |
| */ |
| |
| |
| static const char * progname; /* program name for error messages */ |
| static char * outfilename; /* for -outfile switch */ |
| boolean memsrc; /* for -memsrc switch */ |
| boolean strip, skip; |
| JDIMENSION startY, endY; |
| #define INPUT_BUF_SIZE 4096 |
| |
| |
| LOCAL(void) |
| usage (void) |
| /* complain about bad command line */ |
| { |
| fprintf(stderr, "usage: %s [switches] ", progname); |
| #ifdef TWO_FILE_COMMANDLINE |
| fprintf(stderr, "inputfile outputfile\n"); |
| #else |
| fprintf(stderr, "[inputfile]\n"); |
| #endif |
| |
| fprintf(stderr, "Switches (names may be abbreviated):\n"); |
| fprintf(stderr, " -colors N Reduce image to no more than N colors\n"); |
| fprintf(stderr, " -fast Fast, low-quality processing\n"); |
| fprintf(stderr, " -grayscale Force grayscale output\n"); |
| fprintf(stderr, " -rgb Force RGB output\n"); |
| fprintf(stderr, " -rgb565 Force RGB565 output\n"); |
| #ifdef IDCT_SCALING_SUPPORTED |
| fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n"); |
| #endif |
| #ifdef BMP_SUPPORTED |
| fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n", |
| (DEFAULT_FMT == FMT_BMP ? " (default)" : "")); |
| #endif |
| #ifdef GIF_SUPPORTED |
| fprintf(stderr, " -gif Select GIF output format%s\n", |
| (DEFAULT_FMT == FMT_GIF ? " (default)" : "")); |
| #endif |
| #ifdef BMP_SUPPORTED |
| fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n", |
| (DEFAULT_FMT == FMT_OS2 ? " (default)" : "")); |
| #endif |
| #ifdef PPM_SUPPORTED |
| fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n", |
| (DEFAULT_FMT == FMT_PPM ? " (default)" : "")); |
| #endif |
| #ifdef RLE_SUPPORTED |
| fprintf(stderr, " -rle Select Utah RLE output format%s\n", |
| (DEFAULT_FMT == FMT_RLE ? " (default)" : "")); |
| #endif |
| #ifdef TARGA_SUPPORTED |
| fprintf(stderr, " -targa Select Targa output format%s\n", |
| (DEFAULT_FMT == FMT_TARGA ? " (default)" : "")); |
| #endif |
| fprintf(stderr, "Switches for advanced users:\n"); |
| #ifdef DCT_ISLOW_SUPPORTED |
| fprintf(stderr, " -dct int Use integer DCT method%s\n", |
| (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : "")); |
| #endif |
| #ifdef DCT_IFAST_SUPPORTED |
| fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n", |
| (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : "")); |
| #endif |
| #ifdef DCT_FLOAT_SUPPORTED |
| fprintf(stderr, " -dct float Use floating-point DCT method%s\n", |
| (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : "")); |
| #endif |
| fprintf(stderr, " -dither fs Use F-S dithering (default)\n"); |
| fprintf(stderr, " -dither none Don't use dithering in quantization\n"); |
| fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n"); |
| #ifdef QUANT_2PASS_SUPPORTED |
| fprintf(stderr, " -map FILE Map to colors used in named image file\n"); |
| #endif |
| fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n"); |
| #ifdef QUANT_1PASS_SUPPORTED |
| fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n"); |
| #endif |
| fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); |
| fprintf(stderr, " -outfile name Specify name for output file\n"); |
| #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) |
| fprintf(stderr, " -memsrc Load input file into memory before decompressing\n"); |
| #endif |
| |
| fprintf(stderr, " -skip Y0,Y1 Decode all rows except those between Y0 and Y1 (inclusive)\n"); |
| fprintf(stderr, " -strip Y0,Y1 Decode only rows between Y0 and Y1 (inclusive)\n"); |
| fprintf(stderr, " -verbose or -debug Emit debug output\n"); |
| fprintf(stderr, " -version Print version information and exit\n"); |
| exit(EXIT_FAILURE); |
| } |
| |
| |
| LOCAL(int) |
| parse_switches (j_decompress_ptr cinfo, int argc, char **argv, |
| int last_file_arg_seen, boolean for_real) |
| /* Parse optional switches. |
| * Returns argv[] index of first file-name argument (== argc if none). |
| * Any file names with indexes <= last_file_arg_seen are ignored; |
| * they have presumably been processed in a previous iteration. |
| * (Pass 0 for last_file_arg_seen on the first or only iteration.) |
| * for_real is FALSE on the first (dummy) pass; we may skip any expensive |
| * processing. |
| */ |
| { |
| int argn; |
| char * arg; |
| |
| /* Set up default JPEG parameters. */ |
| requested_fmt = DEFAULT_FMT; /* set default output file format */ |
| outfilename = NULL; |
| memsrc = FALSE; |
| strip = FALSE; |
| skip = FALSE; |
| cinfo->err->trace_level = 0; |
| |
| /* Scan command line options, adjust parameters */ |
| |
| for (argn = 1; argn < argc; argn++) { |
| arg = argv[argn]; |
| if (*arg != '-') { |
| /* Not a switch, must be a file name argument */ |
| if (argn <= last_file_arg_seen) { |
| outfilename = NULL; /* -outfile applies to just one input file */ |
| continue; /* ignore this name if previously processed */ |
| } |
| break; /* else done parsing switches */ |
| } |
| arg++; /* advance past switch marker character */ |
| |
| if (keymatch(arg, "bmp", 1)) { |
| /* BMP output format. */ |
| requested_fmt = FMT_BMP; |
| |
| } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) || |
| keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) { |
| /* Do color quantization. */ |
| int val; |
| |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (sscanf(argv[argn], "%d", &val) != 1) |
| usage(); |
| cinfo->desired_number_of_colors = val; |
| cinfo->quantize_colors = TRUE; |
| |
| } else if (keymatch(arg, "dct", 2)) { |
| /* Select IDCT algorithm. */ |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (keymatch(argv[argn], "int", 1)) { |
| cinfo->dct_method = JDCT_ISLOW; |
| } else if (keymatch(argv[argn], "fast", 2)) { |
| cinfo->dct_method = JDCT_IFAST; |
| } else if (keymatch(argv[argn], "float", 2)) { |
| cinfo->dct_method = JDCT_FLOAT; |
| } else |
| usage(); |
| |
| } else if (keymatch(arg, "dither", 2)) { |
| /* Select dithering algorithm. */ |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (keymatch(argv[argn], "fs", 2)) { |
| cinfo->dither_mode = JDITHER_FS; |
| } else if (keymatch(argv[argn], "none", 2)) { |
| cinfo->dither_mode = JDITHER_NONE; |
| } else if (keymatch(argv[argn], "ordered", 2)) { |
| cinfo->dither_mode = JDITHER_ORDERED; |
| } else |
| usage(); |
| |
| } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { |
| /* Enable debug printouts. */ |
| /* On first -d, print version identification */ |
| static boolean printed_version = FALSE; |
| |
| if (! printed_version) { |
| fprintf(stderr, "%s version %s (build %s)\n", |
| PACKAGE_NAME, VERSION, BUILD); |
| fprintf(stderr, "%s\n\n", JCOPYRIGHT); |
| fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n", |
| JVERSION); |
| printed_version = TRUE; |
| } |
| cinfo->err->trace_level++; |
| |
| } else if (keymatch(arg, "version", 4)) { |
| fprintf(stderr, "%s version %s (build %s)\n", |
| PACKAGE_NAME, VERSION, BUILD); |
| exit(EXIT_SUCCESS); |
| |
| } else if (keymatch(arg, "fast", 1)) { |
| /* Select recommended processing options for quick-and-dirty output. */ |
| cinfo->two_pass_quantize = FALSE; |
| cinfo->dither_mode = JDITHER_ORDERED; |
| if (! cinfo->quantize_colors) /* don't override an earlier -colors */ |
| cinfo->desired_number_of_colors = 216; |
| cinfo->dct_method = JDCT_FASTEST; |
| cinfo->do_fancy_upsampling = FALSE; |
| |
| } else if (keymatch(arg, "gif", 1)) { |
| /* GIF output format. */ |
| requested_fmt = FMT_GIF; |
| |
| } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) { |
| /* Force monochrome output. */ |
| cinfo->out_color_space = JCS_GRAYSCALE; |
| |
| } else if (keymatch(arg, "rgb", 2)) { |
| /* Force RGB output. */ |
| cinfo->out_color_space = JCS_RGB; |
| |
| } else if (keymatch(arg, "rgb565", 2)) { |
| /* Force RGB565 output. */ |
| cinfo->out_color_space = JCS_RGB565; |
| |
| } else if (keymatch(arg, "map", 3)) { |
| /* Quantize to a color map taken from an input file. */ |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (for_real) { /* too expensive to do twice! */ |
| #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */ |
| FILE * mapfile; |
| |
| if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) { |
| fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); |
| exit(EXIT_FAILURE); |
| } |
| read_color_map(cinfo, mapfile); |
| fclose(mapfile); |
| cinfo->quantize_colors = TRUE; |
| #else |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| #endif |
| } |
| |
| } else if (keymatch(arg, "maxmemory", 3)) { |
| /* Maximum memory in Kb (or Mb with 'm'). */ |
| long lval; |
| char ch = 'x'; |
| |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
| usage(); |
| if (ch == 'm' || ch == 'M') |
| lval *= 1000L; |
| cinfo->mem->max_memory_to_use = lval * 1000L; |
| |
| } else if (keymatch(arg, "nosmooth", 3)) { |
| /* Suppress fancy upsampling */ |
| cinfo->do_fancy_upsampling = FALSE; |
| |
| } else if (keymatch(arg, "onepass", 3)) { |
| /* Use fast one-pass quantization. */ |
| cinfo->two_pass_quantize = FALSE; |
| |
| } else if (keymatch(arg, "os2", 3)) { |
| /* BMP output format (OS/2 flavor). */ |
| requested_fmt = FMT_OS2; |
| |
| } else if (keymatch(arg, "outfile", 4)) { |
| /* Set output file name. */ |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| outfilename = argv[argn]; /* save it away for later use */ |
| |
| } else if (keymatch(arg, "memsrc", 2)) { |
| /* Use in-memory source manager */ |
| #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) |
| memsrc = TRUE; |
| #else |
| fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n", |
| progname); |
| exit(EXIT_FAILURE); |
| #endif |
| |
| } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) { |
| /* PPM/PGM output format. */ |
| requested_fmt = FMT_PPM; |
| |
| } else if (keymatch(arg, "rle", 1)) { |
| /* RLE output format. */ |
| requested_fmt = FMT_RLE; |
| |
| } else if (keymatch(arg, "scale", 2)) { |
| /* Scale the output image by a fraction M/N. */ |
| if (++argn >= argc) /* advance to next argument */ |
| usage(); |
| if (sscanf(argv[argn], "%d/%d", |
| &cinfo->scale_num, &cinfo->scale_denom) != 2) |
| usage(); |
| |
| } else if (keymatch(arg, "strip", 2)) { |
| if (++argn >= argc) |
| usage(); |
| if (sscanf(argv[argn], "%d,%d", &startY, &endY) != 2 || startY > endY) |
| usage(); |
| strip = TRUE; |
| |
| |
| } else if (keymatch(arg, "skip", 2)) { |
| if (++argn >= argc) |
| usage(); |
| if (sscanf(argv[argn], "%d,%d", &startY, &endY) != 2 || startY > endY) |
| usage(); |
| skip = TRUE; |
| |
| } else if (keymatch(arg, "targa", 1)) { |
| /* Targa output format. */ |
| requested_fmt = FMT_TARGA; |
| |
| } else { |
| usage(); /* bogus switch */ |
| } |
| } |
| |
| return argn; /* return index of next arg (file name) */ |
| } |
| |
| |
| /* |
| * Marker processor for COM and interesting APPn markers. |
| * This replaces the library's built-in processor, which just skips the marker. |
| * We want to print out the marker as text, to the extent possible. |
| * Note this code relies on a non-suspending data source. |
| */ |
| |
| LOCAL(unsigned int) |
| jpeg_getc (j_decompress_ptr cinfo) |
| /* Read next byte */ |
| { |
| struct jpeg_source_mgr * datasrc = cinfo->src; |
| |
| if (datasrc->bytes_in_buffer == 0) { |
| if (! (*datasrc->fill_input_buffer) (cinfo)) |
| ERREXIT(cinfo, JERR_CANT_SUSPEND); |
| } |
| datasrc->bytes_in_buffer--; |
| return GETJOCTET(*datasrc->next_input_byte++); |
| } |
| |
| |
| METHODDEF(boolean) |
| print_text_marker (j_decompress_ptr cinfo) |
| { |
| boolean traceit = (cinfo->err->trace_level >= 1); |
| long length; |
| unsigned int ch; |
| unsigned int lastch = 0; |
| |
| length = jpeg_getc(cinfo) << 8; |
| length += jpeg_getc(cinfo); |
| length -= 2; /* discount the length word itself */ |
| |
| if (traceit) { |
| if (cinfo->unread_marker == JPEG_COM) |
| fprintf(stderr, "Comment, length %ld:\n", (long) length); |
| else /* assume it is an APPn otherwise */ |
| fprintf(stderr, "APP%d, length %ld:\n", |
| cinfo->unread_marker - JPEG_APP0, (long) length); |
| } |
| |
| while (--length >= 0) { |
| ch = jpeg_getc(cinfo); |
| if (traceit) { |
| /* Emit the character in a readable form. |
| * Nonprintables are converted to \nnn form, |
| * while \ is converted to \\. |
| * Newlines in CR, CR/LF, or LF form will be printed as one newline. |
| */ |
| if (ch == '\r') { |
| fprintf(stderr, "\n"); |
| } else if (ch == '\n') { |
| if (lastch != '\r') |
| fprintf(stderr, "\n"); |
| } else if (ch == '\\') { |
| fprintf(stderr, "\\\\"); |
| } else if (isprint(ch)) { |
| putc(ch, stderr); |
| } else { |
| fprintf(stderr, "\\%03o", ch); |
| } |
| lastch = ch; |
| } |
| } |
| |
| if (traceit) |
| fprintf(stderr, "\n"); |
| |
| return TRUE; |
| } |
| |
| |
| /* |
| * The main program. |
| */ |
| |
| int |
| main (int argc, char **argv) |
| { |
| struct jpeg_decompress_struct cinfo; |
| struct jpeg_error_mgr jerr; |
| #ifdef PROGRESS_REPORT |
| struct cdjpeg_progress_mgr progress; |
| #endif |
| int file_index; |
| djpeg_dest_ptr dest_mgr = NULL; |
| FILE * input_file; |
| FILE * output_file; |
| unsigned char *inbuffer = NULL; |
| unsigned long insize = 0; |
| JDIMENSION num_scanlines; |
| |
| /* On Mac, fetch a command line. */ |
| #ifdef USE_CCOMMAND |
| argc = ccommand(&argv); |
| #endif |
| |
| progname = argv[0]; |
| if (progname == NULL || progname[0] == 0) |
| progname = "djpeg"; /* in case C library doesn't provide it */ |
| |
| /* Initialize the JPEG decompression object with default error handling. */ |
| cinfo.err = jpeg_std_error(&jerr); |
| jpeg_create_decompress(&cinfo); |
| /* Add some application-specific error messages (from cderror.h) */ |
| jerr.addon_message_table = cdjpeg_message_table; |
| jerr.first_addon_message = JMSG_FIRSTADDONCODE; |
| jerr.last_addon_message = JMSG_LASTADDONCODE; |
| |
| /* Insert custom marker processor for COM and APP12. |
| * APP12 is used by some digital camera makers for textual info, |
| * so we provide the ability to display it as text. |
| * If you like, additional APPn marker types can be selected for display, |
| * but don't try to override APP0 or APP14 this way (see libjpeg.txt). |
| */ |
| jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker); |
| jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker); |
| |
| /* Scan command line to find file names. */ |
| /* It is convenient to use just one switch-parsing routine, but the switch |
| * values read here are ignored; we will rescan the switches after opening |
| * the input file. |
| * (Exception: tracing level set here controls verbosity for COM markers |
| * found during jpeg_read_header...) |
| */ |
| |
| file_index = parse_switches(&cinfo, argc, argv, 0, FALSE); |
| |
| #ifdef TWO_FILE_COMMANDLINE |
| /* Must have either -outfile switch or explicit output file name */ |
| if (outfilename == NULL) { |
| if (file_index != argc-2) { |
| fprintf(stderr, "%s: must name one input and one output file\n", |
| progname); |
| usage(); |
| } |
| outfilename = argv[file_index+1]; |
| } else { |
| if (file_index != argc-1) { |
| fprintf(stderr, "%s: must name one input and one output file\n", |
| progname); |
| usage(); |
| } |
| } |
| #else |
| /* Unix style: expect zero or one file name */ |
| if (file_index < argc-1) { |
| fprintf(stderr, "%s: only one input file\n", progname); |
| usage(); |
| } |
| #endif /* TWO_FILE_COMMANDLINE */ |
| |
| /* Open the input file. */ |
| if (file_index < argc) { |
| if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) { |
| fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| /* default input file is stdin */ |
| input_file = read_stdin(); |
| } |
| |
| /* Open the output file. */ |
| if (outfilename != NULL) { |
| if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) { |
| fprintf(stderr, "%s: can't open %s\n", progname, outfilename); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| /* default output file is stdout */ |
| output_file = write_stdout(); |
| } |
| |
| #ifdef PROGRESS_REPORT |
| start_progress_monitor((j_common_ptr) &cinfo, &progress); |
| #endif |
| |
| /* Specify data source for decompression */ |
| #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) |
| if (memsrc) { |
| size_t nbytes; |
| do { |
| inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE); |
| if (inbuffer == NULL) { |
| fprintf(stderr, "%s: memory allocation failure\n", progname); |
| exit(EXIT_FAILURE); |
| } |
| nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE); |
| if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) { |
| if (file_index < argc) |
| fprintf(stderr, "%s: can't read from %s\n", progname, |
| argv[file_index]); |
| else |
| fprintf(stderr, "%s: can't read from stdin\n", progname); |
| } |
| insize += (unsigned long)nbytes; |
| } while (nbytes == INPUT_BUF_SIZE); |
| fprintf(stderr, "Compressed size: %lu bytes\n", insize); |
| jpeg_mem_src(&cinfo, inbuffer, insize); |
| } else |
| #endif |
| jpeg_stdio_src(&cinfo, input_file); |
| |
| /* Read file header, set default decompression parameters */ |
| (void) jpeg_read_header(&cinfo, TRUE); |
| |
| /* Adjust default decompression parameters by re-parsing the options */ |
| file_index = parse_switches(&cinfo, argc, argv, 0, TRUE); |
| |
| /* Initialize the output module now to let it override any crucial |
| * option settings (for instance, GIF wants to force color quantization). |
| */ |
| switch (requested_fmt) { |
| #ifdef BMP_SUPPORTED |
| case FMT_BMP: |
| dest_mgr = jinit_write_bmp(&cinfo, FALSE); |
| break; |
| case FMT_OS2: |
| dest_mgr = jinit_write_bmp(&cinfo, TRUE); |
| break; |
| #endif |
| #ifdef GIF_SUPPORTED |
| case FMT_GIF: |
| dest_mgr = jinit_write_gif(&cinfo); |
| break; |
| #endif |
| #ifdef PPM_SUPPORTED |
| case FMT_PPM: |
| dest_mgr = jinit_write_ppm(&cinfo); |
| break; |
| #endif |
| #ifdef RLE_SUPPORTED |
| case FMT_RLE: |
| dest_mgr = jinit_write_rle(&cinfo); |
| break; |
| #endif |
| #ifdef TARGA_SUPPORTED |
| case FMT_TARGA: |
| dest_mgr = jinit_write_targa(&cinfo); |
| break; |
| #endif |
| default: |
| ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT); |
| break; |
| } |
| dest_mgr->output_file = output_file; |
| |
| /* Start decompressor */ |
| (void) jpeg_start_decompress(&cinfo); |
| |
| /* Strip decode */ |
| if (strip || skip) { |
| JDIMENSION tmp; |
| |
| /* Check for valid endY. We cannot check this value until after |
| * jpeg_start_decompress() is called. Note that we have already verified |
| * that startY <= endY. |
| */ |
| if (endY > cinfo.output_height - 1) { |
| fprintf(stderr, "%s: strip %d-%d exceeds image height %d\n", progname, |
| startY, endY, cinfo.output_height); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Write output file header. This is a hack to ensure that the destination |
| * manager creates an image of the proper size for the partial decode. |
| */ |
| tmp = cinfo.output_height; |
| cinfo.output_height = endY - startY + 1; |
| if (skip) |
| cinfo.output_height = tmp - cinfo.output_height; |
| (*dest_mgr->start_output) (&cinfo, dest_mgr); |
| cinfo.output_height = tmp; |
| |
| /* Process data */ |
| if (skip) { |
| while (cinfo.output_scanline < startY) { |
| num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, |
| dest_mgr->buffer_height); |
| (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); |
| } |
| jpeg_skip_scanlines(&cinfo, endY - startY + 1); |
| while (cinfo.output_scanline < cinfo.output_height) { |
| num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, |
| dest_mgr->buffer_height); |
| (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); |
| } |
| } else { |
| jpeg_skip_scanlines(&cinfo, startY); |
| while (cinfo.output_scanline <= endY) { |
| num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, |
| dest_mgr->buffer_height); |
| (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); |
| } |
| jpeg_skip_scanlines(&cinfo, cinfo.output_height - endY + 1); |
| } |
| |
| /* Normal full image decode */ |
| } else { |
| /* Write output file header */ |
| (*dest_mgr->start_output) (&cinfo, dest_mgr); |
| |
| /* Process data */ |
| while (cinfo.output_scanline < cinfo.output_height) { |
| num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, |
| dest_mgr->buffer_height); |
| (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); |
| } |
| } |
| |
| #ifdef PROGRESS_REPORT |
| /* Hack: count final pass as done in case finish_output does an extra pass. |
| * The library won't have updated completed_passes. |
| */ |
| progress.pub.completed_passes = progress.pub.total_passes; |
| #endif |
| |
| /* Finish decompression and release memory. |
| * I must do it in this order because output module has allocated memory |
| * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. |
| */ |
| (*dest_mgr->finish_output) (&cinfo, dest_mgr); |
| (void) jpeg_finish_decompress(&cinfo); |
| jpeg_destroy_decompress(&cinfo); |
| |
| /* Close files, if we opened them */ |
| if (input_file != stdin) |
| fclose(input_file); |
| if (output_file != stdout) |
| fclose(output_file); |
| |
| #ifdef PROGRESS_REPORT |
| end_progress_monitor((j_common_ptr) &cinfo); |
| #endif |
| |
| if (memsrc && inbuffer != NULL) |
| free(inbuffer); |
| |
| /* All done. */ |
| exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); |
| return 0; /* suppress no-return-value warnings */ |
| } |
