ec6e451d05
Referring to https://github.com/libjpeg-turbo/libjpeg-turbo/issues/402#issuecomment-768348440 and https://github.com/libjpeg-turbo/libjpeg-turbo/issues/402#issuecomment-770221584 Ken Murchison clarified that it was his intent to release the lossless JPEG patch under the IJG License and that adding his name to the copyright headers would be sufficient to acknowledge that any derivatives are based on his work.
632 lines
20 KiB
C
632 lines
20 KiB
C
/*
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* cjpeg.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1998, Thomas G. Lane.
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* Lossless JPEG Modifications:
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* Copyright (C) 1999, Ken Murchison.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains a command-line user interface for the JPEG compressor.
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* It should work on any system with Unix- or MS-DOS-style command lines.
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*
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* Two different command line styles are permitted, depending on the
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* compile-time switch TWO_FILE_COMMANDLINE:
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* cjpeg [options] inputfile outputfile
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* cjpeg [options] [inputfile]
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* In the second style, output is always to standard output, which you'd
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* normally redirect to a file or pipe to some other program. Input is
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* either from a named file or from standard input (typically redirected).
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* The second style is convenient on Unix but is unhelpful on systems that
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* don't support pipes. Also, you MUST use the first style if your system
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* doesn't do binary I/O to stdin/stdout.
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* To simplify script writing, the "-outfile" switch is provided. The syntax
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* cjpeg [options] -outfile outputfile inputfile
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* works regardless of which command line style is used.
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#include "jversion.h" /* for version message */
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#ifdef USE_CCOMMAND /* command-line reader for Macintosh */
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#ifdef __MWERKS__
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#include <SIOUX.h> /* Metrowerks needs this */
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#include <console.h> /* ... and this */
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#endif
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#ifdef THINK_C
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#include <console.h> /* Think declares it here */
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#endif
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#endif
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/* Create the add-on message string table. */
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#define JMESSAGE(code,string) string ,
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static const char * const cdjpeg_message_table[] = {
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#include "cderror.h"
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NULL
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};
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/*
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* This routine determines what format the input file is,
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* and selects the appropriate input-reading module.
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*
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* To determine which family of input formats the file belongs to,
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* we may look only at the first byte of the file, since C does not
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* guarantee that more than one character can be pushed back with ungetc.
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* Looking at additional bytes would require one of these approaches:
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* 1) assume we can fseek() the input file (fails for piped input);
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* 2) assume we can push back more than one character (works in
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* some C implementations, but unportable);
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* 3) provide our own buffering (breaks input readers that want to use
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* stdio directly, such as the RLE library);
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* or 4) don't put back the data, and modify the input_init methods to assume
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* they start reading after the start of file (also breaks RLE library).
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* #1 is attractive for MS-DOS but is untenable on Unix.
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*
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* The most portable solution for file types that can't be identified by their
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* first byte is to make the user tell us what they are. This is also the
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* only approach for "raw" file types that contain only arbitrary values.
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* We presently apply this method for Targa files. Most of the time Targa
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* files start with 0x00, so we recognize that case. Potentially, however,
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* a Targa file could start with any byte value (byte 0 is the length of the
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* seldom-used ID field), so we provide a switch to force Targa input mode.
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*/
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static boolean is_targa; /* records user -targa switch */
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LOCAL(cjpeg_source_ptr)
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select_file_type (j_compress_ptr cinfo, FILE * infile)
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{
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int c;
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if (is_targa) {
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#ifdef TARGA_SUPPORTED
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return jinit_read_targa(cinfo);
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#else
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ERREXIT(cinfo, JERR_TGA_NOTCOMP);
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#endif
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}
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if ((c = getc(infile)) == EOF)
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ERREXIT(cinfo, JERR_INPUT_EMPTY);
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if (ungetc(c, infile) == EOF)
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ERREXIT(cinfo, JERR_UNGETC_FAILED);
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switch (c) {
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#ifdef BMP_SUPPORTED
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case 'B':
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return jinit_read_bmp(cinfo);
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#endif
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#ifdef GIF_SUPPORTED
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case 'G':
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return jinit_read_gif(cinfo);
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#endif
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#ifdef PPM_SUPPORTED
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case 'P':
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return jinit_read_ppm(cinfo);
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#endif
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#ifdef RLE_SUPPORTED
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case 'R':
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return jinit_read_rle(cinfo);
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#endif
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#ifdef TARGA_SUPPORTED
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case 0x00:
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return jinit_read_targa(cinfo);
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#endif
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default:
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ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
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break;
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}
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return NULL; /* suppress compiler warnings */
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}
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/*
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* Argument-parsing code.
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* The switch parser is designed to be useful with DOS-style command line
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* syntax, ie, intermixed switches and file names, where only the switches
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* to the left of a given file name affect processing of that file.
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* The main program in this file doesn't actually use this capability...
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*/
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static const char * progname; /* program name for error messages */
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static char * outfilename; /* for -outfile switch */
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LOCAL(void)
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usage (void)
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/* complain about bad command line */
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{
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fprintf(stderr, "usage: %s [switches] ", progname);
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#ifdef TWO_FILE_COMMANDLINE
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fprintf(stderr, "inputfile outputfile\n");
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#else
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fprintf(stderr, "[inputfile]\n");
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#endif
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fprintf(stderr, "Switches (names may be abbreviated):\n");
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fprintf(stderr, " -quality N Compression quality (0..100; 5-95 is useful range)\n");
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fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
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#ifdef ENTROPY_OPT_SUPPORTED
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fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
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#endif
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#ifdef C_PROGRESSIVE_SUPPORTED
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fprintf(stderr, " -progressive Create progressive JPEG file\n");
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#endif
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#ifdef C_LOSSLESS_SUPPORTED
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fprintf(stderr, " -lossless psv[,Pt] Create lossless JPEG file\n");
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#endif
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#ifdef TARGA_SUPPORTED
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fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
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#endif
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fprintf(stderr, "Switches for advanced users:\n");
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#ifdef DCT_ISLOW_SUPPORTED
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fprintf(stderr, " -dct int Use integer DCT method%s\n",
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(JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
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#endif
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#ifdef DCT_IFAST_SUPPORTED
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fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
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(JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
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#endif
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#ifdef DCT_FLOAT_SUPPORTED
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fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
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(JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
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#endif
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fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
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#ifdef INPUT_SMOOTHING_SUPPORTED
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fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
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#endif
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fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
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fprintf(stderr, " -outfile name Specify name for output file\n");
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fprintf(stderr, " -verbose or -debug Emit debug output\n");
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fprintf(stderr, "Switches for wizards:\n");
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#ifdef C_ARITH_CODING_SUPPORTED
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fprintf(stderr, " -arithmetic Use arithmetic coding\n");
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#endif
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fprintf(stderr, " -baseline Force baseline quantization tables\n");
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fprintf(stderr, " -qtables file Use quantization tables given in file\n");
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fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
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fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
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#endif
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exit(EXIT_FAILURE);
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}
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LOCAL(int)
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parse_switches (j_compress_ptr cinfo, int argc, char **argv,
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int last_file_arg_seen, boolean for_real)
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/* Parse optional switches.
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* Returns argv[] index of first file-name argument (== argc if none).
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* Any file names with indexes <= last_file_arg_seen are ignored;
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* they have presumably been processed in a previous iteration.
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* (Pass 0 for last_file_arg_seen on the first or only iteration.)
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* for_real is FALSE on the first (dummy) pass; we may skip any expensive
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* processing.
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*/
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{
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int argn;
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char * arg;
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int quality; /* -quality parameter */
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int q_scale_factor; /* scaling percentage for -qtables */
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boolean force_baseline;
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boolean simple_progressive;
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char * qtablefile = NULL; /* saves -qtables filename if any */
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char * qslotsarg = NULL; /* saves -qslots parm if any */
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char * samplearg = NULL; /* saves -sample parm if any */
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char * scansarg = NULL; /* saves -scans parm if any */
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char * losslsarg = NULL; /* saves -lossless parm if any */
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/* Set up default JPEG parameters. */
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/* Note that default -quality level need not, and does not,
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* match the default scaling for an explicit -qtables argument.
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*/
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quality = 75; /* default -quality value */
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q_scale_factor = 100; /* default to no scaling for -qtables */
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force_baseline = FALSE; /* by default, allow 16-bit quantizers */
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simple_progressive = FALSE;
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is_targa = FALSE;
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outfilename = NULL;
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cinfo->err->trace_level = 0;
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/* Scan command line options, adjust parameters */
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for (argn = 1; argn < argc; argn++) {
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arg = argv[argn];
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if (*arg != '-') {
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/* Not a switch, must be a file name argument */
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if (argn <= last_file_arg_seen) {
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outfilename = NULL; /* -outfile applies to just one input file */
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continue; /* ignore this name if previously processed */
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}
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break; /* else done parsing switches */
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}
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arg++; /* advance past switch marker character */
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if (keymatch(arg, "arithmetic", 1)) {
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/* Use arithmetic coding. */
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#ifdef C_ARITH_CODING_SUPPORTED
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cinfo->arith_code = TRUE;
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#else
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fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "baseline", 1)) {
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/* Force baseline-compatible output (8-bit quantizer values). */
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force_baseline = TRUE;
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} else if (keymatch(arg, "dct", 2)) {
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/* Select DCT algorithm. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (keymatch(argv[argn], "int", 1)) {
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cinfo->dct_method = JDCT_ISLOW;
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} else if (keymatch(argv[argn], "fast", 2)) {
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cinfo->dct_method = JDCT_IFAST;
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} else if (keymatch(argv[argn], "float", 2)) {
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cinfo->dct_method = JDCT_FLOAT;
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} else
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usage();
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} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
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/* Enable debug printouts. */
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/* On first -d, print version identification */
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static boolean printed_version = FALSE;
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if (! printed_version) {
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fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
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JVERSION, JCOPYRIGHT);
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printed_version = TRUE;
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}
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cinfo->err->trace_level++;
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} else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
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/* Force a monochrome JPEG file to be generated. */
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jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
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} else if (keymatch(arg, "lossless", 1)) {
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/* Select simple lossless mode. */
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#ifdef C_LOSSLESS_SUPPORTED
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if (++argn >= argc) /* advance to next argument */
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usage();
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losslsarg = argv[argn];
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/* We must postpone execution until num_components is known. */
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#else
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fprintf(stderr, "%s: sorry, lossless output was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "maxmemory", 3)) {
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/* Maximum memory in Kb (or Mb with 'm'). */
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long lval;
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char ch = 'x';
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
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usage();
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if (ch == 'm' || ch == 'M')
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lval *= 1000L;
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cinfo->mem->max_memory_to_use = lval * 1000L;
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} else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
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/* Enable entropy parm optimization. */
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#ifdef ENTROPY_OPT_SUPPORTED
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cinfo->optimize_coding = TRUE;
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#else
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fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "outfile", 4)) {
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/* Set output file name. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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outfilename = argv[argn]; /* save it away for later use */
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} else if (keymatch(arg, "progressive", 1)) {
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/* Select simple progressive mode. */
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#ifdef C_PROGRESSIVE_SUPPORTED
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simple_progressive = TRUE;
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/* We must postpone execution until num_components is known. */
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#else
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fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "quality", 1)) {
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/* Quality factor (quantization table scaling factor). */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%d", &quality) != 1)
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usage();
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/* Change scale factor in case -qtables is present. */
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q_scale_factor = jpeg_quality_scaling(quality);
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} else if (keymatch(arg, "qslots", 2)) {
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/* Quantization table slot numbers. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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qslotsarg = argv[argn];
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/* Must delay setting qslots until after we have processed any
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* colorspace-determining switches, since jpeg_set_colorspace sets
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* default quant table numbers.
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*/
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} else if (keymatch(arg, "qtables", 2)) {
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/* Quantization tables fetched from file. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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qtablefile = argv[argn];
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/* We postpone actually reading the file in case -quality comes later. */
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} else if (keymatch(arg, "restart", 1)) {
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/* Restart interval in MCU rows (or in MCUs with 'b'). */
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long lval;
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char ch = 'x';
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
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usage();
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if (lval < 0 || lval > 65535L)
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usage();
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if (ch == 'b' || ch == 'B') {
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cinfo->restart_interval = (unsigned int) lval;
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cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
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} else {
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cinfo->restart_in_rows = (int) lval;
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/* restart_interval will be computed during startup */
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}
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} else if (keymatch(arg, "sample", 2)) {
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/* Set sampling factors. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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samplearg = argv[argn];
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/* Must delay setting sample factors until after we have processed any
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* colorspace-determining switches, since jpeg_set_colorspace sets
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* default sampling factors.
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*/
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} else if (keymatch(arg, "scans", 2)) {
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/* Set scan script. */
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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if (++argn >= argc) /* advance to next argument */
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usage();
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scansarg = argv[argn];
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/* We must postpone reading the file in case -progressive appears. */
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#else
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fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "smooth", 2)) {
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/* Set input smoothing factor. */
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int val;
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%d", &val) != 1)
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usage();
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if (val < 0 || val > 100)
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usage();
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cinfo->smoothing_factor = val;
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} else if (keymatch(arg, "targa", 1)) {
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/* Input file is Targa format. */
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is_targa = TRUE;
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} else {
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usage(); /* bogus switch */
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}
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}
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/* Post-switch-scanning cleanup */
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if (for_real) {
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/* Set quantization tables for selected quality. */
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/* Some or all may be overridden if -qtables is present. */
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jpeg_set_quality(cinfo, quality, force_baseline);
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if (qtablefile != NULL) /* process -qtables if it was present */
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if (! read_quant_tables(cinfo, qtablefile,
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q_scale_factor, force_baseline))
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usage();
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if (qslotsarg != NULL) /* process -qslots if it was present */
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if (! set_quant_slots(cinfo, qslotsarg))
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usage();
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if (samplearg != NULL) /* process -sample if it was present */
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if (! set_sample_factors(cinfo, samplearg))
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usage();
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#ifdef C_PROGRESSIVE_SUPPORTED
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if (simple_progressive) /* process -progressive; -scans can override */
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jpeg_simple_progression(cinfo);
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#endif
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#ifdef C_LOSSLESS_SUPPORTED
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if (losslsarg != NULL) /* process -lossless if it was present */
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if (! set_simple_lossless(cinfo, losslsarg))
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usage();
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#endif
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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if (scansarg != NULL) /* process -scans if it was present */
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if (! read_scan_script(cinfo, scansarg))
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usage();
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#endif
|
|
}
|
|
|
|
return argn; /* return index of next arg (file name) */
|
|
}
|
|
|
|
|
|
/*
|
|
* The main program.
|
|
*/
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
struct jpeg_compress_struct cinfo;
|
|
struct jpeg_error_mgr jerr;
|
|
#ifdef PROGRESS_REPORT
|
|
struct cdjpeg_progress_mgr progress;
|
|
#endif
|
|
int file_index;
|
|
cjpeg_source_ptr src_mgr;
|
|
FILE * input_file;
|
|
FILE * output_file;
|
|
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 = "cjpeg"; /* in case C library doesn't provide it */
|
|
|
|
/* Initialize the JPEG compression object with default error handling. */
|
|
cinfo.err = jpeg_std_error(&jerr);
|
|
jpeg_create_compress(&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;
|
|
|
|
/* Now safe to enable signal catcher. */
|
|
#ifdef NEED_SIGNAL_CATCHER
|
|
enable_signal_catcher((j_common_ptr) &cinfo);
|
|
#endif
|
|
|
|
/* Initialize JPEG parameters.
|
|
* Much of this may be overridden later.
|
|
* In particular, we don't yet know the input file's color space,
|
|
* but we need to provide some value for jpeg_set_defaults() to work.
|
|
*/
|
|
|
|
cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
|
|
jpeg_set_defaults(&cinfo);
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
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
|
|
|
|
/* Figure out the input file format, and set up to read it. */
|
|
src_mgr = select_file_type(&cinfo, input_file);
|
|
src_mgr->input_file = input_file;
|
|
|
|
/* Read the input file header to obtain file size & colorspace. */
|
|
(*src_mgr->start_input) (&cinfo, src_mgr);
|
|
|
|
/* Now that we know input colorspace, fix colorspace-dependent defaults */
|
|
jpeg_default_colorspace(&cinfo);
|
|
|
|
/* Adjust default compression parameters by re-parsing the options */
|
|
file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
|
|
|
|
/* Specify data destination for compression */
|
|
jpeg_stdio_dest(&cinfo, output_file);
|
|
|
|
/* Start compressor */
|
|
jpeg_start_compress(&cinfo, TRUE);
|
|
|
|
/* Process data */
|
|
while (cinfo.next_scanline < cinfo.image_height) {
|
|
num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
|
|
(void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
|
|
}
|
|
|
|
/* Finish compression and release memory */
|
|
(*src_mgr->finish_input) (&cinfo, src_mgr);
|
|
jpeg_finish_compress(&cinfo);
|
|
jpeg_destroy_compress(&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
|
|
|
|
/* All done. */
|
|
exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
|
|
return 0; /* suppress no-return-value warnings */
|
|
}
|