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jpegoptim.c
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/*******************************************************************
* JPEGoptim
* Copyright (c) Timo Kokkonen, 1996-2025.
* All Rights Reserved.
*
* requires libjpeg (Independent JPEG Group's JPEG software
* release 6a or later...)
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* This file is part of JPEGoptim.
*
* JPEGoptim is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JPEGoptim is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with JPEGoptim. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_DIRENT_H
#include <dirent.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#if HAVE_GETOPT_H && HAVE_GETOPT_LONG
#include <getopt.h>
#else
#include "getopt.h"
#endif
#include <signal.h>
#include <string.h>
#include <jpeglib.h>
#include <jerror.h>
#include <setjmp.h>
#include <time.h>
#include <math.h>
#include "jpegmarker.h"
#include "jpegoptim.h"
#define VERSION "1.5.6beta"
#define COPYRIGHT "Copyright (C) 1996-2025, Timo Kokkonen"
#if HAVE_WAIT && HAVE_FORK
#define PARALLEL_PROCESSING 1
#define MAX_WORKERS 256
#endif
struct my_error_mgr {
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
int jump_set;
};
typedef struct my_error_mgr * my_error_ptr;
#ifdef PARALLEL_PROCESSING
struct worker {
pid_t pid;
int read_pipe;
};
struct worker *workers;
int worker_count = 0;
#endif
int verbose_mode = 0;
int quiet_mode = 0;
int preserve_mode = 0;
int preserve_perms = 0;
int overwrite_mode = 0;
int totals_mode = 0;
int stdin_mode = 0;
int stdout_mode = 0;
int noaction = 0;
int quality = -1;
int retry = 0;
int dest = 0;
int force = 0;
int save_exif = 1;
int save_iptc = 1;
int save_com = 1;
int save_icc = 1;
int save_xmp = 1;
int save_adobe = 0;
int save_jfxx = 0;
int save_jfif = 1;
int strip_none = 0;
double threshold = -1.0;
int csv = 0;
int all_normal = 0;
int all_progressive = 0;
int target_size = 0;
#ifdef HAVE_ARITH_CODE
int arith_mode = -1;
#endif
int max_workers = 1;
int nofix_mode = 0;
int files_stdin = 0;
FILE *files_from = NULL;
int compress_err_count = 0;
int decompress_err_count = 0;
int global_error_counter = 0;
char last_error[JMSG_LENGTH_MAX+1];
FILE *jpeg_log_fh;
long average_count = 0;
double average_rate = 0.0;
double total_save = 0.0;
const struct option long_options[] = {
#ifdef HAVE_ARITH_CODE
{ "all-arith", 0, &arith_mode, 1 },
{ "all-huffman", 0, &arith_mode, 0 },
#endif
{ "all-normal", 0, &all_normal, 1 },
{ "all-progressive", 0, &all_progressive, 1 },
{ "csv", 0, 0, 'b' },
{ "dest", 1, 0, 'd' },
{ "files-stdin", 0, &files_stdin, 1 },
{ "files-from", 1, 0, 'F' },
{ "force", 0, 0, 'f' },
{ "help", 0, 0, 'h' },
{ "keep-adobe", 0, &save_adobe, 1 },
{ "keep-all", 0, &strip_none, 1 },
{ "keep-com", 0, &save_com, 1 },
{ "keep-exif", 0, &save_exif, 1 },
{ "keep-iptc", 0, &save_iptc, 1 },
{ "keep-icc", 0, &save_icc, 1 },
{ "keep-jfif", 0, &save_jfif, 1 },
{ "keep-jfxx", 0, &save_jfxx, 1 },
{ "keep-xmp", 0, &save_xmp, 1 },
{ "max", 1, 0, 'm' },
{ "noaction", 0, 0, 'n' },
{ "nofix", 0, &nofix_mode, 1 },
{ "overwrite", 0, 0, 'o' },
{ "preserve", 0, 0, 'p' },
{ "preserve-perms", 0, 0, 'P' },
{ "quiet", 0, 0, 'q' },
{ "size", 1, 0, 'S' },
{ "stdin", 0, &stdin_mode, 1 },
{ "stdout", 0, &stdout_mode, 1 },
{ "strip-all", 0, 0, 's' },
{ "strip-none", 0, &strip_none, 1 },
{ "strip-com", 0, &save_com, 0 },
{ "strip-exif", 0, &save_exif, 0 },
{ "strip-iptc", 0, &save_iptc, 0 },
{ "strip-icc", 0, &save_icc, 0 },
{ "strip-xmp", 0, &save_xmp, 0 },
{ "strip-jfif", 0, &save_jfif, 0 },
{ "strip-jfxx", 0, &save_jfxx, 0 },
{ "strip-adobe", 0, &save_adobe, 0 },
{ "threshold", 1, 0, 'T' },
{ "totals", 0, 0, 't' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
#ifdef PARALLEL_PROCESSING
{ "workers", 1, &max_workers, 'w' },
#endif
{ 0, 0, 0, 0 }
};
/*****************************************************************/
void free_line_buf(JSAMPARRAY *buf, unsigned int lines)
{
if (*buf == NULL)
return;
for (unsigned int i = 0; i < lines; i++) {
if ((*buf)[i])
free((*buf)[i]);
}
free(*buf);
*buf = NULL;
}
METHODDEF(void) my_error_exit (j_common_ptr cinfo)
{
my_error_ptr myerr = (my_error_ptr)cinfo->err;
(*cinfo->err->output_message)(cinfo);
if (myerr->jump_set)
longjmp(myerr->setjmp_buffer, 1);
else
fatal("fatal error");
}
METHODDEF(void) my_output_message (j_common_ptr cinfo)
{
char buffer[JMSG_LENGTH_MAX+1];
(*cinfo->err->format_message)((j_common_ptr)cinfo, buffer);
buffer[sizeof(buffer) - 1] = 0;
if (verbose_mode)
fprintf(jpeg_log_fh, " (%s) ", buffer);
global_error_counter++;
strncopy(last_error, buffer, sizeof(last_error));
}
void print_usage(void)
{
fprintf(stderr,PROGRAMNAME " v" VERSION " " COPYRIGHT "\n");
fprintf(stderr,
"Usage: " PROGRAMNAME " [options] <filenames> \n\n"
" -d<path>, --dest=<path>\n"
" specify alternative destination directory for \n"
" optimized files (default is to overwrite originals)\n"
" -f, --force force optimization\n"
" -h, --help display this help and exit\n"
" -m<quality>, --max=<quality>\n"
" set maximum image quality factor (disables lossless\n"
" optimization mode, which is by default on)\n"
" Valid quality values: 0 - 100\n"
" -n, --noaction don't really optimize files, just print results\n"
" -S<size>, --size=<size>\n"
" Try to optimize file to given size (disables lossless\n"
" optimization mode). Target size is specified either in\n"
" kilo bytes (1 - n) or as percentage (1%% - 99%%)\n"
" -T<threshold>, --threshold=<threshold>\n"
" keep old file if the gain is below a threshold (%%)\n"
#ifdef PARALLEL_PROCESSING
" -w<max>, --workers=<max>\n"
" set maximum number of parallel threads (default is 1)\n"
#endif
" -b, --csv print progress info in CSV format\n"
" -o, --overwrite overwrite target file even if it exists (meaningful\n"
" only when used with -d, --dest option)\n"
" -p, --preserve preserve file timestamps\n"
" -P, --preserve-perms\n"
" preserve original file permissions by overwriting it\n"
" -q, --quiet quiet mode\n"
" -t, --totals print totals after processing all files\n"
" -v, --verbose enable verbose mode (positively chatty)\n"
" -V, --version print program version\n\n"
" -s, --strip-all strip all markers from output file\n"
" --strip-none do not strip any markers\n"
" --strip-adobe strip Adobe (APP14) markers from output file\n"
" --strip-com strip Comment markers from output file\n"
" --strip-exif strip Exif markers from output file\n"
" --strip-iptc strip IPTC/Photoshop (APP13) markers from output file\n"
" --strip-icc strip ICC profile markers from output file\n"
" --strip-jfif strip JFIF markers from output file\n"
" --strip-jfxx strip JFXX (JFIF Extension) markers from output file\n"
" --strip-xmp strip XMP markers markers from output file\n"
"\n"
" --keep-all do not strip any markers (same as --strip-none)\n"
" --keep-adobe preserve any Adobe (APP14) markers\n"
" --keep-com preserve any Comment markers\n"
" --keep-exif preserve any Exif markers\n"
" --keep-iptc preserve any IPTC/Photoshop (APP13) markers\n"
" --keep-icc preserve any ICC profile markers\n"
" --keep-jfif preserve any JFIF markers\n"
" --keep-jfxx preserve any JFXX (JFIF Extension) markers\n"
" --keep-xmp preserve any XMP markers markers\n"
"\n"
" --all-normal force all output files to be non-progressive\n"
" --all-progressive force all output files to be progressive\n"
#ifdef HAVE_ARITH_CODE
" --all-arith force all output files to use arithmetic coding\n"
" --all-huffman force all output files to use Huffman coding\n"
#endif
" --stdout send output to standard output (instead of a file)\n"
" --stdin read input from standard input (instead of a file)\n"
" --files-stdin Read names of files to process from stdin\n"
" --files-from=FILE Read names of files to process from a file\n"
" --nofix skip processing of input files if they contain any errors\n"
"\n\n");
}
void print_version()
{
struct jpeg_error_mgr jerr;
#ifdef __DATE__
printf(PROGRAMNAME " v%s %s (%s)\n",VERSION, HOST_TYPE, __DATE__);
#else
printf(PROGRAMNAME " v%s %s\n", VERSION, HOST_TYPE);
#endif
printf(COPYRIGHT "\n\n");
printf("This program comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
"and you are welcome to redistribute it under certain conditions.\n"
"See the GNU General Public License for more details.\n\n");
if (!jpeg_std_error(&jerr))
fatal("jpeg_std_error() failed");
printf("\nlibjpeg version: %s\n%s\n",
jerr.jpeg_message_table[JMSG_VERSION],
jerr.jpeg_message_table[JMSG_COPYRIGHT]);
}
void parse_arguments(int argc, char **argv, char *dest_path, size_t dest_path_len)
{
int opt_index;
int i, c;
while(1) {
opt_index=0;
if ((c = getopt_long(argc,argv,"d:hm:nstqvfVpPoT:S:bw:",
long_options, &opt_index)) == -1)
break;
switch (c) {
case 'm':
{
int tmpvar;
if (sscanf(optarg,"%d",&tmpvar) == 1) {
quality=tmpvar;
if (quality < 0) quality=0;
if (quality > 100) quality=100;
}
else
fatal("invalid argument for -m, --max");
}
break;
case 'd':
if (realpath(optarg,dest_path)==NULL)
fatal("invalid destination directory: %s", optarg);
if (!is_directory(dest_path))
fatal("destination not a directory: %s", dest_path);
strncatenate(dest_path, DIR_SEPARATOR_S, dest_path_len);
if (verbose_mode)
fprintf(stderr,"Destination directory: %s\n",dest_path);
dest=1;
break;
case 'v':
verbose_mode++;
break;
case 'h':
print_usage();
exit(0);
break;
case 'q':
quiet_mode=1;
break;
case 't':
totals_mode=1;
break;
case 'n':
noaction=1;
break;
case 'f':
force=1;
break;
case 'b':
csv=1;
quiet_mode=1;
break;
case 'V':
print_version();
exit(0);
break;
case 'o':
overwrite_mode=1;
break;
case 'p':
preserve_mode=1;
break;
case 'P':
preserve_perms=1;
break;
case 's':
save_exif=0;
save_iptc=0;
save_com=0;
save_icc=0;
save_xmp=0;
save_adobe=0;
save_jfif=0;
save_jfxx=0;
break;
case 'T':
{
double tmpvar;
if (sscanf(optarg,"%lf", &tmpvar) == 1) {
threshold=tmpvar;
if (threshold < 0) threshold=0;
if (threshold > 100) threshold=100;
}
else fatal("invalid argument for -T, --threshold");
}
break;
case 'S':
{
unsigned int tmpvar;
if (sscanf(optarg,"%u", &tmpvar) == 1) {
if (tmpvar > 0 && tmpvar < 100 &&
optarg[strlen(optarg)-1] == '%' ) {
target_size=-tmpvar;
} else {
target_size=tmpvar;
}
quality=100;
}
else fatal("invalid argument for -S, --size");
}
break;
#ifdef PARALLEL_PROCESSING
case 'w':
{
int tmpvar;
if (sscanf(optarg, "%d", &tmpvar) == 1) {
if (tmpvar > 0 && tmpvar <= MAX_WORKERS)
max_workers = tmpvar;
}
else fatal("invalid argument for -w, --workers");
}
break;
#endif
case 'F':
{
if (optarg[0] == '-' && optarg[1] == 0) {
files_stdin = 1;
break;
}
if (!is_file(optarg, NULL))
fatal("argument for --files-from must be a file");
if ((files_from = fopen(optarg, "r")) == NULL)
fatal("cannot open file: '%s'", optarg);
}
break;
case '?':
exit(1);
}
}
/* check for '-' option indicating input is from stdin... */
i = optind;
while (argv[i]) {
if (argv[i][0]=='-' && argv[i][1]==0)
stdin_mode=1;
i++;
}
if (stdin_mode)
stdout_mode=1;
if (all_normal && all_progressive)
fatal("cannot specify both --all-normal and --all-progressive");
if (files_stdin)
files_from = stdin;
if (stdin_mode && files_from == stdin)
fatal("cannot specify both --stdin and --files-stdin");
}
void own_signal_handler(int a)
{
if (verbose_mode > 1)
fprintf(stderr,PROGRAMNAME ": died from signal: %d\n",a);
exit(2);
}
void write_markers(struct jpeg_decompress_struct *dinfo,
struct jpeg_compress_struct *cinfo)
{
jpeg_saved_marker_ptr mrk;
int write_marker;
const char *s_name;
if (!cinfo || !dinfo)
fatal("invalid call to write_markers()");
mrk=dinfo->marker_list;
while (mrk) {
write_marker = 0;
s_name = jpeg_special_marker_name(mrk);
/* Check for markers to save... */
if (save_com && mrk->marker == JPEG_COM)
write_marker++;
if (save_iptc && !strncmp(s_name, "IPTC", 5))
write_marker++;
if (save_exif && !strncmp(s_name, "Exif", 5))
write_marker++;
if (save_icc && !strncmp(s_name, "ICC", 4))
write_marker++;
if (save_xmp && !strncmp(s_name, "XMP", 4))
write_marker++;
if (save_jfxx && !strncmp(s_name, "JFXX", 5))
write_marker++;
if (save_adobe && !strncmp(s_name, "Adobe", 6))
write_marker++;
if (strip_none)
write_marker++;
/* libjpeg emits some markers automatically so skip these to avoid duplicates... */
if (!strncmp(s_name, "JFIF", 5))
write_marker=0;
if (verbose_mode > 2)
fprintf(jpeg_log_fh, " (Marker %s [%s]: %s) ", jpeg_marker_name(mrk->marker),
s_name, (write_marker ? "Keep" : "Discard"));
if (write_marker)
jpeg_write_marker(cinfo, mrk->marker, mrk->data, mrk->data_length);
mrk=mrk->next;
}
}
unsigned int parse_markers(const struct jpeg_decompress_struct *dinfo,
char *str, unsigned int str_size, unsigned int *markers_total_size)
{
jpeg_saved_marker_ptr m;
unsigned int count = 0;
char *seen;
size_t marker_types = jpeg_special_marker_types_count();
int com_seen = 0;
int special;
if ((seen = calloc(marker_types, 1)) == NULL)
fatal("not enough of memory");
str[0] = 0;
*markers_total_size = 0;
m = dinfo->marker_list;
while (m) {
count++;
*markers_total_size += m->data_length;
if ((special = jpeg_special_marker(m)) >= 0) {
if (!seen[special])
str_add_list(str, str_size, jpeg_special_marker_types[special].name, ",");
seen[special]++;
}
if (m->marker == JPEG_COM && !com_seen) {
str_add_list(str, str_size, "COM", ",");
com_seen = 1;
}
m = m->next;
}
free(seen);
return count;
}
int optimize(FILE *log_fh, const char *filename, const char *newname,
const char *tmpdir, struct stat *file_stat,
double *rate, double *saved)
{
FILE *infile = NULL;
FILE *outfile = NULL;
const char *outfname = NULL;
char tmpfilename[MAXPATHLEN];
struct jpeg_decompress_struct dinfo;
struct jpeg_compress_struct cinfo;
struct my_error_mgr jcerr, jderr;
JSAMPARRAY buf = NULL;
unsigned char *outbuffer = NULL;
size_t outbuffersize = 0;
unsigned char *inbuffer = NULL;
size_t inbuffersize = 0;
size_t inbufferused = 0;
jvirt_barray_ptr *coef_arrays = NULL;
char marker_str[256];
unsigned int marker_in_count, marker_in_size;
long insize = 0, outsize = 0, lastsize = 0;
long inpos;
int oldquality, searchcount, searchdone;
double ratio;
int res = -1;
jpeg_log_fh = log_fh;
/* Initialize decompression object */
dinfo.err = jpeg_std_error(&jderr.pub);
jpeg_create_decompress(&dinfo);
jderr.pub.error_exit=my_error_exit;
jderr.pub.output_message=my_output_message;
jderr.jump_set = 0;
/* Initialize compression object */
cinfo.err = jpeg_std_error(&jcerr.pub);
jpeg_create_compress(&cinfo);
jcerr.pub.error_exit=my_error_exit;
jcerr.pub.output_message=my_output_message;
jcerr.jump_set = 0;
if (rate)
*rate = 0.0;
if (saved)
*saved = 0.0;
retry_point:
if (filename) {
if ((infile = fopen(filename, "rb")) == NULL) {
warn("cannot open file: %s", filename);
res = 1;
goto exit_point;
}
} else {
infile = stdin;
set_filemode_binary(infile);
}
if (setjmp(jderr.setjmp_buffer)) {
/* Error handler for decompress */
abort_decompress:
jpeg_abort_decompress(&dinfo);
fclose(infile);
free_line_buf(&buf, dinfo.output_height);
if (!quiet_mode || csv)
fprintf(log_fh,csv ? ",,,,,error\n" : " [ERROR]\n");
jderr.jump_set=0;
res = 1;
goto exit_point;
} else {
jderr.jump_set=1;
}
if (!retry && (!quiet_mode || csv)) {
fprintf(log_fh,csv ? "%s," : "%s ",(filename ? filename:"stdin"));
fflush(log_fh);
}
/* Prepare to decompress */
if (stdin_mode || stdout_mode) {
if (inbuffer)
free(inbuffer);
inbuffersize = 65536;
if (!(inbuffer=calloc(inbuffersize, 1)))
fatal("not enough memory");
}
global_error_counter=0;
jpeg_save_markers(&dinfo, JPEG_COM, 0xffff);
for (int i = 0; i < 16; i++) {
jpeg_save_markers(&dinfo, JPEG_APP0 + i, 0xffff);
}
jpeg_custom_src(&dinfo, infile, &inbuffer, &inbuffersize, &inbufferused, 65536);
jpeg_read_header(&dinfo, TRUE);
/* Check for known (Exif, IPTC, ICC , XMP, ...) markers */
marker_in_count = parse_markers(&dinfo, marker_str, sizeof(marker_str),
&marker_in_size);
if (verbose_mode > 1) {
fprintf(log_fh,"%d markers found in input file (total size %d bytes)\n",
marker_in_count,marker_in_size);
fprintf(log_fh,"coding: %s\n", (dinfo.arith_code == TRUE ? "Arithmetic" : "Huffman"));
}
if (!retry && (!quiet_mode || csv)) {
fprintf(log_fh,csv ? "%dx%d,%dbit,%c," : "%dx%d %dbit %c ",(int)dinfo.image_width,
(int)dinfo.image_height,(int)dinfo.num_components*8,
(dinfo.progressive_mode?'P':'N'));
if (!csv)
fprintf(log_fh,"%s",marker_str);
fflush(log_fh);
}
if ((insize=file_size(infile)) < 0)
fatal("failed to stat() input file");
/* Decompress the image */
if (quality >= 0 && !retry) {
jpeg_start_decompress(&dinfo);
/* Allocate line buffer to store the decompressed image */
if (!(buf = calloc(dinfo.output_height, sizeof(JSAMPROW))))
fatal("not enough memory");
for (int i = 0; i < dinfo.output_height; i++) {
if (!(buf[i]=calloc((size_t)dinfo.output_width * dinfo.out_color_components,
sizeof(JSAMPLE))))
fatal("not enough memory");
}
while (dinfo.output_scanline < dinfo.output_height) {
jpeg_read_scanlines(&dinfo,&buf[dinfo.output_scanline],
dinfo.output_height-dinfo.output_scanline);
}
} else {
coef_arrays = jpeg_read_coefficients(&dinfo);
if (!coef_arrays) {
if (!quiet_mode)
fprintf(log_fh, " (failed to read coefficients) ");
goto abort_decompress;
}
}
inpos = ftell(infile);
if (inpos > 0 && inpos < insize) {
if (!quiet_mode)
fprintf(log_fh, " (%lu bytes extraneous data found after end of image) ",
insize - inpos);
if (nofix_mode)
global_error_counter++;
}
if (!retry && !quiet_mode) {
fprintf(log_fh,(global_error_counter==0 ? " [OK] " : " [WARNING] "));
fflush(log_fh);
}
if (stdin_mode)
insize = inbufferused;
if (nofix_mode && global_error_counter != 0) {
/* Skip files containing any errors (or warnings) */
goto abort_decompress;
}
if (dest && !noaction) {
if (file_exists(newname) && !overwrite_mode) {
if (!quiet_mode)
fprintf(log_fh, " (target file already exists) ");
goto abort_decompress;
}
}
if (setjmp(jcerr.setjmp_buffer)) {
/* Error handler for compress failures */
if (!quiet_mode)
fprintf(log_fh," [Compress ERROR: %s]\n",last_error);
jpeg_abort_compress(&cinfo);
jpeg_abort_decompress(&dinfo);
fclose(infile);
free_line_buf(&buf, dinfo.output_height);
jcerr.jump_set=0;
res = 2;
goto exit_point;
} else {
jcerr.jump_set=1;
}
lastsize = 0;
searchcount = 0;
searchdone = 0;
oldquality = 200;
if (target_size != 0) {
/* Always start with quality 100 if -S option specified... */
quality = 100;
}
binary_search_loop:
/* Allocate memory buffer that should be large enough to store the output JPEG... */
if (outbuffer)
free(outbuffer);
outbuffersize = insize + 32768;
if (!(outbuffer=calloc(outbuffersize, 1)))
fatal("not enough memory");
/* setup custom "destination manager" for libjpeg to write to our buffer */
jpeg_memory_dest(&cinfo, &outbuffer, &outbuffersize, 65536);
if (quality >= 0 && !retry) {
/* Lossy "optimization" ... */
cinfo.in_color_space=dinfo.out_color_space;
cinfo.input_components=dinfo.output_components;
cinfo.image_width=dinfo.image_width;
cinfo.image_height=dinfo.image_height;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo,quality,TRUE);
#ifdef HAVE_JINT_DC_SCAN_OPT_MODE
if (jpeg_c_int_param_supported(&cinfo, JINT_DC_SCAN_OPT_MODE))
jpeg_c_set_int_param(&cinfo, JINT_DC_SCAN_OPT_MODE, 1);
#endif
if (all_normal || (!dinfo.progressive_mode && !all_progressive)) {
/* Explicitly disable progressive mode. */
cinfo.scan_info = NULL;
cinfo.num_scans = 0;
} else if (all_progressive || dinfo.progressive_mode) {
/* Enable progressive mode. */
jpeg_simple_progression(&cinfo);
}
cinfo.optimize_coding = TRUE;
#ifdef HAVE_ARITH_CODE
if (arith_mode >= 0)
cinfo.arith_code = (arith_mode > 0 ? TRUE : FALSE);
#endif
if (dinfo.saw_JFIF_marker && (save_jfif || strip_none)) {
cinfo.write_JFIF_header = TRUE;
} else {
cinfo.write_JFIF_header = FALSE;
}
if (dinfo.saw_Adobe_marker && (save_adobe || strip_none)) {
/* If outputting Adobe marker, don't write JFIF marker... */
cinfo.write_JFIF_header = FALSE;
}
jpeg_start_compress(&cinfo,TRUE);
/* Write markers */
write_markers(&dinfo,&cinfo);
/* Write image */
while (cinfo.next_scanline < cinfo.image_height) {
jpeg_write_scanlines(&cinfo,&buf[cinfo.next_scanline],
dinfo.output_height);
}
} else {
/* Lossless optimization ... */
jpeg_copy_critical_parameters(&dinfo, &cinfo);
#ifdef HAVE_JINT_DC_SCAN_OPT_MODE
if (jpeg_c_int_param_supported(&cinfo, JINT_DC_SCAN_OPT_MODE))
jpeg_c_set_int_param(&cinfo, JINT_DC_SCAN_OPT_MODE, 1);
#endif
if (all_normal || (!dinfo.progressive_mode && !all_progressive)) {
/* Explicitly disable progressive mode. */
cinfo.scan_info = NULL;
cinfo.num_scans = 0;
} else if (all_progressive || dinfo.progressive_mode) {
/* Enable progressive mode. */
jpeg_simple_progression(&cinfo);
}
cinfo.optimize_coding = TRUE;
#ifdef HAVE_ARITH_CODE
if (arith_mode >= 0)
cinfo.arith_code = (arith_mode > 0 ? TRUE : FALSE);
#endif
if (dinfo.saw_JFIF_marker && (save_jfif || strip_none)) {
cinfo.write_JFIF_header = TRUE;
} else {
cinfo.write_JFIF_header = FALSE;
}
if (dinfo.saw_Adobe_marker && (save_adobe || strip_none)) {
/* If outputting Adobe marker, don't write JFIF marker... */
cinfo.write_JFIF_header = FALSE;
}
/* Write image */
jpeg_write_coefficients(&cinfo, coef_arrays);
/* Write markers */
write_markers(&dinfo,&cinfo);
}
jpeg_finish_compress(&cinfo);
outsize=outbuffersize;
if (target_size != 0 && !retry) {
/* Perform (binary) search to try to reach target file size... */
long osize = outsize/1024;
long isize = insize/1024;
long tsize = target_size;
if (tsize < 0) {
tsize=((-target_size)*insize/100)/1024;
if (tsize < 1)
tsize = 1;
}
if (osize == tsize || searchdone || searchcount >= 8 || tsize > isize) {
if (searchdone < 42 && lastsize > 0) {
if (labs(osize-tsize) > labs(lastsize-tsize)) {
if (verbose_mode) fprintf(log_fh,"(revert to %d)",oldquality);
searchdone=42;
quality=oldquality;
goto binary_search_loop;
}
}
if (verbose_mode)
fprintf(log_fh," ");
} else {
int newquality;
int dif = floor((abs(oldquality-quality)/2.0)+0.5);
if (osize > tsize) {
newquality=quality-dif;
if (dif < 1) { newquality--; searchdone=1; }
if (newquality < 0) { newquality=0; searchdone=2; }
} else {
newquality=quality+dif;
if (dif < 1) { newquality++; searchdone=3; }
if (newquality > 100) { newquality=100; searchdone=4; }
}
oldquality=quality;
quality=newquality;
if (verbose_mode)
fprintf(log_fh,"(try %d)",quality);
lastsize=osize;
searchcount++;
goto binary_search_loop;
}
}
jpeg_finish_decompress(&dinfo);
fclose(infile);
free_line_buf(&buf, dinfo.output_height);
if (quality >= 0 && outsize >= insize && !retry && !stdin_mode) {
if (verbose_mode)
fprintf(log_fh,"(retry w/lossless) ");
retry=1;
goto retry_point;
}
retry=0;
ratio=(insize-outsize)*100.0/insize;
if (!quiet_mode || csv)
fprintf(log_fh,csv ? "%ld,%ld,%0.2f," : "%ld --> %ld bytes (%0.2f%%), ",insize,outsize,ratio);
if (rate) {
*rate = (ratio < 0 ? 0.0 : ratio);
}
if ((outsize < insize && ratio >= threshold) || force) {
if (saved) {
*saved = (insize - outsize) / 1024.0;
}
if (!quiet_mode || csv)
fprintf(log_fh,csv ? "optimized\n" : "optimized.\n");
if (noaction) {
res = 0;
goto exit_point;
}