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ce85ad6640b8718fd05f58a47c1f83d9e98aad94
libpng/pngcrush.c
Glenn Randers-Pehrson ce85ad6640 Imported from pngcrush-1.2.1.tar
2009-04-16 10:46:36 -05:00

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/* crushpng.c - a simple program to recompress png files
*
* This program reads in a PNG image, and writes it out again, with the
* optimum filter_type and zlib_level. It uses brute force (trying
* filter_type none, and libpng adaptive filtering, with compression
* levels 3 and 9). It does the most time-consuming method last in case
* it turns out to be the best.
*
* Optionally, it can remove unwanted chunks or add gAMA and sRGB chunks.
*
* Uses libpng-1.0.5a. This program was based upon libpng's pngtest.c.
*
* Thanks to Greg Roelofs for various bug fixes, suggestions, and
* occasionally creating Linux executables.
*/
#define PNGCRUSH_VERSION "1.2.1"
/*
* COPYRIGHT NOTICE, DISCLAIMER, AND LICENSE:
*
* Copyright (c) 1998, 1999, Glenn Randers-Pehrson
*
* The pngcrush program is supplied "AS IS". The Author disclaims all
* warranties, expressed or implied, including, without limitation, the
* warranties of merchantability and of fitness for any purpose. The
* Author assumes no liability for direct, indirect, incidental, special,
* exemplary, or consequential damages, which may result from the use of
* the pngcrush program, even if advised of the possibility of such damage.
*
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
*
* 1. The origin of this source code must not be misrepresented.
*
* 2. Altered versions must be plainly marked as such and must not be
* misrepresented as being the original source.
*
* 3. This Copyright notice, disclaimer, and license may not be removed
* or altered from any source or altered source distribution.
*/
/* To do:
*
* Version 1.2.*: check for unused alpha channel and ok-to-reduce-depth.
* Rearrange palette to put most-used color first and
* transparent color second.
*
* Version 1.2.2: Add iCCP, iTXt, sCAL, and sPLT support, which are
* now supported by libpng.
*
* Change log:
*
* Version 1.2.1: Fixed -srgb parameter so it really does take an argument,
* and so it continues to use "0" if an integer does not follow the -srgb.
* Added "-plte_len n" argument for truncating the PLTE. Be sure not to
* truncate it to less than the greatest index actually appearing in IDAT.
*
* Version 1.2.0: Removed registration requirement. Added open source
* license. Redefined TOO_FAR=32k in deflate.c.
*
* Changes prior to going "open source":
*
* Version 1.1.8: built with libpng-1.0.5a. Runs OK with pngvcrd.c.
*
* Version 1.1.7: added ability to add tEXt/zTXt chunks. Fixed bug with
* closing a file that wasn't opened when using "pngcrush -n". Fixed
* bug with tEXt/zTXt chunks after IDAT not being copied.
* Added alpha to the displayed palette table. Rebuilt with libpng-1.0.5.
*
* Version 1.1.6: fixed bug with one file left open after each image is
* processed
*
* Version 1.1.5: Shorten or remove tRNS chunks that are all opaque or have
* opaque entries at the end. Added timing report.
*
* Version 1.1.4: added ability to restrict brute_force to one or more filter
* types, compression levels, or compression strategies.
*/
#if defined(__DJGPP__)
# if ((__DJGPP__ == 2) && (__DJGPP_MINOR__ == 0))
# include <libc/dosio.h> /* for _USE_LFN, djgpp 2.0 only */
# endif
# define SLASH "\\"
#else
# define SLASH "/"
#endif
#if !defined(__BORLANDC__) && !defined(_MBCS)
# include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <assert.h>
#ifdef _MBCS
# include <direct.h>
#endif
#define DEFAULT_MODE 0
#define DIRECTORY_MODE 1
#define EXTENSION_MODE 2
#define FOPEN(file, how) fopen(file, how)
#define FCLOSE(file) {fclose(file); file=NULL;--number_of_open_files;};
/* we don't need the extra libpng tranformations
* so they are ifdef'ed out in a special version of pngconf.h */
#define PNG_INTERNAL
#include "png.h"
#ifdef __TURBOC__
#include <mem.h>
#endif
/* defined so I can write to a file on gui/windowing platforms */
/* #define STDERR stderr */
#define STDERR stdout /* for DOS */
/* input and output filenames */
static PNG_CONST char *progname = "pngtest.png";
static PNG_CONST char *inname = "pngtest.png";
static PNG_CONST char *outname = "pngout.png";
static PNG_CONST char *dirname = "pngcrush.bak";
static PNG_CONST char *extension = "_C.png";
static int number_of_open_files;
char *ip, *op, *dot;
char in_string[256];
char prog_string[256];
char out_string[256];
char in_extension[256];
int text_inputs=0;
int text_where[10]; /* 0: no text; 1: before PLTE; 2: after PLTE */
int text_compression[10]; /* 0: tEXt; 1: zTXt */
char text_text[20480]; /* It would be nice to png_malloc this, but we don't
* have a png_ptr yet when we need it. */
char text_keyword[800];
int best;
char buffer[256];
char *str_return;
jmp_buf jmpbuf;
static png_uint_32 total_input_length = 0;
static png_uint_32 total_output_length = 0;
static int pngcrush_mode = DEFAULT_MODE;
static int resolution = 0;
static int remove_chunks = 0;
static int output_color_type;
static int output_bit_depth;
static int force_output_color_type=8;
static int force_output_bit_depth=0;
static int input_color_type;
static int input_bit_depth;
static int trial;
static int verbose=1;
static int help=0;
static int things_have_changed=0;
static int default_compression_window=15;
static int force_compression_window=0;
static int final_method=0;
static int brute_force=0;
static int brute_force_level=0;
static int brute_force_filter=0;
static int brute_force_strategy=0;
static int brute_force_levels[10]={1,1,1,1,1,1,1,1,1,1};
static int brute_force_filters[6]={1,1,1,1,1,1};
static int brute_force_strategies[3]={1,1,1};
static int method=10;
static int pauses=0;
static int nosave=0;
static png_bytep row_buf;
static int z_strategy;
static int best_of_three;
static int methods_specified=0;
static int intent=-1;
static int plte_len=-1;
static double specified_gamma=0.;
static double force_specified_gamma=0.;
static int double_gamma=0;
static int names;
static int have_trns=0;
static png_uint_16 trns_index=0;
static png_uint_16 trns_red=0;
static png_uint_16 trns_green=0;
static png_uint_16 trns_blue=0;
static png_uint_16 trns_gray=0;
static int have_bkgd=0;
static png_uint_16 bkgd_red=0;
static png_uint_16 bkgd_green=0;
static png_uint_16 bkgd_blue=0;
static png_colorp palette;
static int num_palette;
static png_byte trns_array[256];
#ifdef REORDER_PALETTE
static png_byte palette_reorder[256];
#endif
static png_structp read_ptr, write_ptr;
static png_infop read_info_ptr, write_info_ptr;
static png_infop end_info_ptr;
static png_infop write_end_info_ptr;
static FILE *fpin, *fpout;
png_uint_32 measure_idats(FILE *fpin);
png_uint_32 png_measure_idat(png_structp png_ptr, png_infop info_ptr);
# define MAX_METHODS 200
# define MAX_METHODSP1 201
# define DEFAULT_METHODS 10
static png_uint_32 idat_length[MAX_METHODSP1];
static int filter_method, zlib_level;
static png_bytep png_row_filters=NULL;
static float t_start, t_stop, t_decode, t_encode, t_misc;
static int max_idat_size = PNG_ZBUF_SIZE;
int ia;
/* START of code to validate memory allocation and deallocation */
#ifdef PNG_USER_MEM_SUPPORTED
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
it not to. See zconf.h and png.h for more information. zlib does
need to allocate exactly 64K, so whatever you call here must
have the ability to do that.
This piece of code can be compiled to validate max 64K allocations
by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
typedef struct memory_information {
png_uint_32 size;
png_voidp pointer;
struct memory_information FAR *next;
} memory_information;
typedef memory_information FAR *memory_infop;
static memory_infop pinformation = NULL;
static int current_allocation = 0;
static int maximum_allocation = 0;
extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
png_voidp
png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
/* png_malloc has already tested for NULL; png_create_struct calls
png_debug_malloc directly, with png_ptr == NULL which is OK */
if (size == 0)
return (png_voidp)(NULL);
/* This calls the library allocator twice, once to get the requested
buffer and once to get a new free list entry. */
{
memory_infop pinfo = png_malloc_default(png_ptr, sizeof *pinfo);
pinfo->size = size;
current_allocation += size;
if (current_allocation > maximum_allocation)
maximum_allocation = current_allocation;
pinfo->pointer = png_malloc_default(png_ptr, size);
pinfo->next = pinformation;
pinformation = pinfo;
/* Make sure the caller isn't assuming zeroed memory. */
png_memset(pinfo->pointer, 0xdd, pinfo->size);
if(verbose > 2)
fprintf(STDERR, "Pointer %x allocated\n", pinfo->pointer);
return (png_voidp)(pinfo->pointer);
}
}
/* Free a pointer. It is removed from the list at the same time. */
void
png_debug_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to png_debug_free.\n");
if (ptr == 0) {
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
#endif
return;
}
/* Unlink the element from the list. */
{
memory_infop FAR *ppinfo = &pinformation;
for (;;) {
memory_infop pinfo = *ppinfo;
if (pinfo->pointer == ptr) {
*ppinfo = pinfo->next;
current_allocation -= pinfo->size;
if (current_allocation < 0)
fprintf(STDERR, "Duplicate free of memory\n");
/* We must free the list element too, but first kill
the memory that is to be freed. */
memset(ptr, 0x55, pinfo->size);
png_free_default(png_ptr, pinfo);
if(verbose > 2)
fprintf(STDERR, "Pointer %x freed\n", ptr);
break;
}
if (pinfo->next == NULL) {
fprintf(STDERR, "Pointer %x not found\n", ptr);
break;
}
ppinfo = &pinfo->next;
}
}
/* Finally free the data. */
png_free_default(png_ptr, ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
/* END of code to test memory allocation/deallocation */
void png_crush_pause(void);
void png_crush_pause(void)
{
if(pauses > 0)
{
char keystroke;
fprintf(STDERR, "Press [ENTER] key to continue.\n");
keystroke=(char)getc(stdin);
}
}
#define PNG_CRUSH_CLEANUP \
fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname); \
if(row_buf != NULL)png_free(read_ptr, row_buf); \
row_buf = (png_bytep)NULL; \
png_destroy_info_struct(write_ptr, &write_end_info_ptr); \
png_destroy_write_struct(&write_ptr, &write_info_ptr); \
if(nosave == 0) \
{ \
FCLOSE(fpout); \
} \
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr); \
FCLOSE(fpin); \
if(verbose > 1) \
fprintf(STDERR, "returning after longjump\n"); \
exit(1);
int keep_chunk(png_const_charp name, char *argv[]);
int keep_chunk(png_const_charp name, char *argv[])
{
int i;
if(verbose > 2 && trial == 1)
fprintf(STDERR, " Read the %s chunk.\n", name);
if(remove_chunks == 0) return 1;
if(verbose > 1 && trial == 1)
fprintf(STDERR, " Check for removal of the %s chunk.\n", name);
for (i=1; i<=remove_chunks; i++)
{
if(!strncmp(argv[i],"-r",2))
{
int alla = 0;
int allb = 0;
i++;
if(!strncmp(argv[i],"alla",4)) alla++; /* all ancillaries */
if(!strncmp(argv[i],"all",3)) allb++; /* all but gamma */
if(!strncmp(argv[i],name,4) ||
(!strncmp(name,"PLTE",4) && (!strncmp(argv[i],"plte",4))) ||
(!strncmp(name,"bKGD",4) && (!strncmp(argv[i],"bkgd",4) || allb)) ||
(!strncmp(name,"cHRM",4) && (!strncmp(argv[i],"chrm",4) || allb)) ||
(!strncmp(name,"gAMA",4) && (!strncmp(argv[i],"gama",4) || alla)) ||
(!strncmp(name,"gIFg",4) && (!strncmp(argv[i],"gifg",4) || allb)) ||
(!strncmp(name,"gIFt",4) && (!strncmp(argv[i],"gift",4) || allb)) ||
(!strncmp(name,"gIFx",4) && (!strncmp(argv[i],"gifx",4) || allb)) ||
(!strncmp(name,"hIST",4) && (!strncmp(argv[i],"hist",4) || allb)) ||
(!strncmp(name,"iCCP",4) && (!strncmp(argv[i],"iccp",4) || allb)) ||
(!strncmp(name,"oFFs",4) && (!strncmp(argv[i],"offs",4) || allb)) ||
(!strncmp(name,"pHYs",4) && (!strncmp(argv[i],"phys",4) || allb)) ||
(!strncmp(name,"pCAL",4) && (!strncmp(argv[i],"pcal",4) || allb)) ||
(!strncmp(name,"sBIT",4) && (!strncmp(argv[i],"sbit",4) || allb)) ||
(!strncmp(name,"sRGB",4) && (!strncmp(argv[i],"srgb",4) || allb)) ||
(!strncmp(name,"tEXt",4) && (!strncmp(argv[i],"text",4) || allb)) ||
(!strncmp(name,"tIME",4) && (!strncmp(argv[i],"time",4) || allb)) ||
(!strncmp(name,"tRNS",4) && (!strncmp(argv[i],"trns",4))) ||
(!strncmp(name,"zTXt",4) && (!strncmp(argv[i],"text",4) || allb)) ||
(!strncmp(name,"zTXt",4) && (!strncmp(argv[i],"ztxt",4))))
{
things_have_changed=1;
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Removed the %s chunk.\n", name);
return 0;
}
}
}
if(verbose > 1 && trial == 1)
fprintf(STDERR, " Preserving the %s chunk.\n", name);
return 1;
}
void
show_result(void)
{
if(total_output_length)
{
if(total_input_length == total_output_length)
fprintf(STDERR,
" Overall result: no change\n");
else if(total_input_length > total_output_length)
fprintf(STDERR,
" Overall result: %4.2f%% reduction, %ld bytes\n",
(100.0 - (100.0*total_output_length)/total_input_length),
total_input_length - total_output_length);
else
fprintf(STDERR,
" Overall result: %4.2f%% increase, %ld bytes\n",
-(100.0 - (100.0*total_output_length)/total_input_length),
total_output_length - total_input_length);
}
t_stop = (float)clock();
t_misc += (t_stop - t_start);
t_start = t_stop;
fprintf(STDERR," CPU time used = %.3f seconds",
(t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
fprintf(STDERR," (decoding %.3f,\n",
t_decode/(float)CLOCKS_PER_SEC);
fprintf(STDERR," encoding %.3f,",
t_encode/(float)CLOCKS_PER_SEC);
fprintf(STDERR," other %.3f seconds)\n\n",
t_misc/(float)CLOCKS_PER_SEC);
#ifdef PNG_USER_MEM_SUPPORTED
if (current_allocation != 0) {
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL) {
fprintf(STDERR, " %8d bytes at %x\n", pinfo->size, pinfo->pointer);
free(pinfo->pointer);
pinfo = pinfo->next;
}
}
#endif
}
int
main(int argc, char *argv[])
{
png_uint_32 y;
png_uint_32 width, height;
int num_pass, pass;
int bit_depth, color_type;
int try_method[MAX_METHODSP1];
int fm[MAX_METHODSP1];
int lv[MAX_METHODSP1];
int zs[MAX_METHODSP1];
int ntrial;
double file_gamma=0.;
char *cp;
int i;
row_buf = (png_bytep)NULL;
number_of_open_files=0;
if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
{
fprintf(STDERR,
"Warning: versions are different between png.h and png.c\n");
fprintf(STDERR, " png.h version: %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " png.c version: %s\n\n", png_libpng_ver);
}
t_start = (float)clock();
prog_string[0] = '\0';
str_return = strcat(prog_string,argv[0]);
progname = prog_string;
for(i=0, cp=prog_string; *cp!='\0'; i++, cp++)
{
if(*cp == '\\' || *cp == '/') progname = ++cp;
if(*cp == '.') *cp='\0';
}
for(i=0; i<MAX_METHODS; i++)
{
try_method[i]=1;
fm[i]=5;
zs[i]=1;
lv[i]=9;
}
fm[1]=0; fm[2]=1; fm[4]=0; fm[5]=1; fm[7]=0; fm[8]=1;
lv[1]=4; lv[2]=4; lv[3]=4; lv[9]=2;
zs[1]=0; zs[2]=0; zs[5]= 0; zs[6]=0; zs[7]=0; zs[9]=2;
names=1;
for (i=1; i<argc; i++)
{
if(!strncmp(argv[i],"-",1))
names++;
if(!strncmp(argv[i],"-fast",5))
/* try two fast filters */
{
methods_specified=1;
zs[11]=0;
lv[11]=4;
fm[11]=0;
try_method[11]=0;
zs[12]=2;
lv[12]=1;
fm[12]=5;
try_method[12]=0;
}
else if(!strncmp(argv[i],"-huffman",8))
/* try all filters with huffman */
{
int filt;
methods_specified=1;
method=11;
for(filt=0; filt<6; filt++)
{
zs[method]=2;
lv[method]=2;
fm[method]=filt;
try_method[method]=0;
method++;
}
}
else if( !strncmp(argv[i],"-bkgd",5) ||
!strncmp(argv[i],"-bKGD",5))
{
names+=3;
have_bkgd=1;
bkgd_red=(png_uint_16)atoi(argv[++i]);
bkgd_green=(png_uint_16)atoi(argv[++i]);
bkgd_blue=(png_uint_16)atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-brute",6))
/* brute force try everything */
{
int lev, strat, filt;
methods_specified=1;
method=11;
brute_force++;
brute_force_strategy=0;
for (strat=0; strat<3; strat++)
brute_force_strategies[strat]=0;
brute_force_level=0;
brute_force_filter=0;
for(filt=0; filt<6; filt++)
{
zs[method]=2;
lv[method]=2;
fm[method]=filt;
try_method[method]=0;
brute_force_filters[filt]=0;
method++;
}
for(lev=1; lev<10; lev++)
{
brute_force_levels[lev]=0;
for(strat=0; strat<2; strat++)
{
for(filt=0; filt<6; filt++)
{
zs[method]=strat;
lv[method]=lev;
fm[method]=filt;
try_method[method]=0;
method++;
}
}
}
}
else if(!strncmp(argv[i],"-bit_depth",10))
{
names++;
force_output_bit_depth=atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-c",2))
{
names++;
force_output_color_type=atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-dou",4))
{
double_gamma++;
things_have_changed=1;
}
else if(!strncmp(argv[i],"-d",2))
{
i++;
pngcrush_mode=DIRECTORY_MODE;
dirname= argv[names++];
}
else if(!strncmp(argv[i],"-e",2))
{
i++;
pngcrush_mode=EXTENSION_MODE;
extension= argv[names++];
}
else if(!strncmp(argv[i],"-force",6))
{
things_have_changed=1;
}
else if(!strncmp(argv[i],"-f",2))
{
int specified_filter=atoi(argv[++i]);
int lev, strat, filt;
if(specified_filter > 5 || specified_filter < 0)
specified_filter = 5;
names++;
if(brute_force == 0)
fm[method]=specified_filter;
else
{
if(brute_force_filter == 0)
for (filt=0; filt<6; filt++)
brute_force_filters[filt]=1;
brute_force_filters[specified_filter]=0;
method=11;
for(filt=0; filt<6; filt++)
{
try_method[method]= brute_force_filters[filt] |
brute_force_strategies[2];
method++;
}
for(lev=1; lev<10; lev++)
{
for(strat=0; strat<2; strat++)
{
for(filt=0; filt<6; filt++)
{
try_method[method]=brute_force_levels[lev] |
brute_force_filters[filt] |
brute_force_strategies[strat];
method++;
}
}
}
brute_force_filter++;
}
}
else if(!strncmp(argv[i],"-l",2))
{
int lev, strat, filt;
int specified_level=atoi(argv[++i]);
if(specified_level > 9 || specified_level < 0)
specified_level = 9;
names++;
if(brute_force == 0)
lv[method]=specified_level;
else
{
if(brute_force_level == 0)
for (lev=0; lev<10; lev++)
brute_force_levels[lev]=1;
brute_force_levels[specified_level]=0;
method=11;
for(filt=0; filt<6; filt++)
{
lv[method]=specified_level;
method++;
}
for(lev=1; lev<10; lev++)
{
for(strat=0; strat<2; strat++)
{
for(filt=0; filt<6; filt++)
{
try_method[method]=brute_force_levels[lev] |
brute_force_filters[filt] |
brute_force_strategies[strat];
method++;
}
}
}
brute_force_level++;
}
}
else if(!strncmp(argv[i],"-g",2))
{
names++;
i++;
if (intent < 0) specified_gamma=atof(argv[i]);
}
else if(!strncmp(argv[i],"-h",2))
{
help++;
verbose++;
}
else if(!strncmp(argv[i],"-max",4))
{
names++;
max_idat_size = atoi(argv[++i]);
if (max_idat_size > PNG_ZBUF_SIZE) max_idat_size=PNG_ZBUF_SIZE;
}
else if(!strncmp(argv[i],"-m",2))
{
names++;
method=atoi(argv[++i]);
methods_specified=1;
brute_force=0;
try_method[method]=0;
}
else if(!strncmp(argv[i],"-nosave",2))
{
/* no save; I just use this for testing decode speed */
nosave++;
pngcrush_mode=EXTENSION_MODE;
}
else if(!strncmp(argv[i],"-plte_len",9))
{
names++;
plte_len=atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-p",2))
{
pauses++;
}
else if(!strncmp(argv[i],"-rep",4))
{
names++;
force_specified_gamma=atof(argv[++i]);
things_have_changed=1;
}
else if(!strncmp(argv[i],"-res",4))
{
names++;
resolution=atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-r",2))
{
remove_chunks=i;
names++;
i++;
}
else if( !strncmp(argv[i],"-srgb",5) ||
!strncmp(argv[i],"-sRGB",5))
{
specified_gamma=.45455;
intent=0;
i++;
if(!strncmp(argv[i],"0",1) ||
!strncmp(argv[i],"1",1) ||
!strncmp(argv[i],"2",1) ||
!strncmp(argv[i],"3",1))
{
names++;
intent=(int)atoi(argv[i]);
}
else
i--;
}
else if(!strncmp(argv[i],"-s",2))
{
verbose=0;
}
else if( !strncmp(argv[i],"-text",5) || !strncmp(argv[i],"-tEXt",5) ||
!strncmp(argv[i],"-ztxt",5) || !strncmp(argv[i],"-zTXt",5))
{
if(strlen(argv[i+2]) < 80 && strlen(argv[i+3]) < 2048 &&
text_inputs < 10)
{
if( !strncmp(argv[i],"-z",2))
text_compression[text_inputs] = PNG_TEXT_COMPRESSION_zTXt;
else
text_compression[text_inputs] = PNG_TEXT_COMPRESSION_NONE;
names+=3;
if( !strncmp(argv[++i],"b",1))
text_where[text_inputs]=1;
if( !strncmp(argv[i],"a",1))
text_where[text_inputs]=2;
strcpy(&text_keyword[text_inputs*80],argv[++i]);
strcpy(&text_text[text_inputs*2048],argv[++i]);
text_inputs++;
}
else
{
if(text_inputs > 9)
fprintf(STDERR,
"too many text/zTXt inputs; only 10 allowed\n");
else
fprintf(STDERR,
"keyword exceeds 79 characters or text exceeds 2047 characters\n");
i+=3;
names+=3;
}
}
else if( !strncmp(argv[i],"-trns",5) ||
!strncmp(argv[i],"-tRNS",5))
{
names+=5;
have_trns=1;
trns_index=(png_uint_16)atoi(argv[++i]);
trns_red=(png_uint_16)atoi(argv[++i]);
trns_green=(png_uint_16)atoi(argv[++i]);
trns_blue=(png_uint_16)atoi(argv[++i]);
trns_gray=(png_uint_16)atoi(argv[++i]);
}
else if(!strncmp(argv[i],"-version",8))
{
fprintf(STDERR,"libpng ");
fprintf(STDERR, PNG_LIBPNG_VER_STRING );
fprintf(STDERR,", uses zlib ");
fprintf(STDERR, ZLIB_VERSION );
fprintf(STDERR,"\n");
}
else if(!strncmp(argv[i],"-v",2))
{
verbose++;
}
else if(!strncmp(argv[i],"-w",2))
{
default_compression_window=atoi(argv[++i]);
force_compression_window++;
names++;
}
else if(!strncmp(argv[i],"-z",2))
{
int lev, strat, filt;
int specified_strategy=atoi(argv[++i]);
if(specified_strategy > 2 || specified_strategy < 0)
specified_strategy = 0;
names++;
if(brute_force == 0)
zs[method]=specified_strategy;
else
{
if(brute_force_strategy == 0)
for (strat=0; strat<2; strat++)
brute_force_strategies[strat]=1;
brute_force_strategies[specified_strategy]=0;
method=11;
for(filt=0; filt<6; filt++)
{
if(specified_strategy != 2)
try_method[method]=1;
method++;
}
for(lev=1; lev<10; lev++)
{
for(strat=0; strat<2; strat++)
{
for(filt=0; filt<6; filt++)
{
try_method[method]=brute_force_levels[lev] |
brute_force_filters[filt] |
brute_force_strategies[strat];
method++;
}
}
}
}
brute_force_strategy++;
}
}
{
fprintf(STDERR,
"\n | %s %s, Copyright (C) 1998, 1999, Glenn Randers-Pehrson\n",
progname, PNGCRUSH_VERSION);
fprintf(STDERR, " | This is a free, open-source program. Permission is\n");
fprintf(STDERR, " | granted to everyone to use pngcrush without fee.\n");
}
if(verbose > 0)
{
fprintf(STDERR,
" | This program was built with libpng version %s,\n",
PNG_LIBPNG_VER_STRING);
fprintf(STDERR,
" | Copyright (C) 1995, Guy Eric Schalnat, Group 42 Inc.,\n");
fprintf(STDERR,
" | Copyright (C) 1996, 1997 Andreas Dilger,\n");
fprintf(STDERR,
" | Copyright (C) 1998, 1999, Glenn Randers-Pehrson,\n");
fprintf(STDERR,
" | and zlib version %s, Copyright (c) 1998,\n",
ZLIB_VERSION);
fprintf(STDERR,
" | Jean-loup Gailly and Mark Adler.\n");
#if defined(__DJGPP__)
fprintf(STDERR,
" | It was compiled with gcc version %s and as version %s\n",
__VERSION__, "2.81");
/* is there a macro for "as" versions? */
fprintf(STDERR,
" | under DJGPP %d.%d, Copyright (c) 1995, D. J. Delorie\n",
__DJGPP__,__DJGPP_MINOR__);
fprintf(STDERR,
" | and loaded with PMODE/DJ, by Thomas Pytel and Matthias Grimrath\n");
fprintf(STDERR,
" | Copyright (c) 1996, Matthias Grimrath.\n");
#endif
fprintf(STDERR,"\n");
}
if (default_compression_window == 32) default_compression_window=15;
else if(default_compression_window == 16) default_compression_window=14;
else if(default_compression_window == 8) default_compression_window=13;
else if(default_compression_window == 4) default_compression_window=12;
else if(default_compression_window == 2) default_compression_window=11;
else if(default_compression_window == 1) default_compression_window=10;
else if(default_compression_window == 512) default_compression_window= 9;
else if(default_compression_window == 256) default_compression_window= 8;
else if(default_compression_window != 15)
{
fprintf(STDERR,"Invalid window size (%d); using window size=4\n",
default_compression_window);
default_compression_window=12;
}
if(pngcrush_mode == DEFAULT_MODE && argc - names == 2)
{
inname= argv[names];
outname=argv[names+1];
}
if(pngcrush_mode == DEFAULT_MODE && (argc - names == 1 || nosave))
{
inname= argv[names];
}
if((nosave == 0 && pngcrush_mode == DEFAULT_MODE && argc - names != 2) ||
help > 0)
{
fprintf(STDERR,
"\nusage: %s [options] infile.png outfile.png\n",progname);
fprintf(STDERR,
" %s -e ext [other options] files.png ...\n",progname);
fprintf(STDERR,
" %s -d dir [other options] files.png ...\n",progname);
if(verbose > 1)
{
png_crush_pause();
fprintf(STDERR, "\noptions:\n");
}
else
fprintf(STDERR, "options:\n");
fprintf(STDERR,
" -brute (Use brute-force, try 114 different methods)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Very time-consuming and generally not worthwhile.\n");
fprintf(STDERR,
" You can restrict this option to certain filter types,\n");
fprintf(STDERR,
" compression levels, or strategies by following it with\n");
fprintf(STDERR,
" \"-f filter\", \"-l level\", or \"-z strategy\".\n\n");
}
fprintf(STDERR,
" -c color_type of output file [0, 2, 4, or 6]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Color type for the output file. Future versions\n");
fprintf(STDERR,
" will also allow color_type 3, if there are 256 or\n");
fprintf(STDERR,
" fewer colors present in the input file. Color types\n");
fprintf(STDERR,
" 4 and 6 are padded with an opaque alpha channel if\n");
fprintf(STDERR,
" the input file does not have alpha information.\n");
fprintf(STDERR,
" Use 0 or 2 to delete an unwanted alpha channel.\n");
fprintf(STDERR,
" Default is to use same color type as the input file.\n\n");
}
fprintf(STDERR,
" -d directory_name (where output files will go)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n If a directory name is given, then the output\n");
fprintf(STDERR,
" files are placed in it, with the same filenames as\n");
fprintf(STDERR,
" those of the original files. For example,\n");
fprintf(STDERR,
" you would type 'pngcrush -directory CRUSHED *.png'\n");
fprintf(STDERR,
" to get *.png => CRUSHED/*.png\n\n");
}
png_crush_pause();
fprintf(STDERR,
" -double_gamma (used for fixing gamma in PhotoShop 5.0/5.02 files)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n It has been claimed that the PS5 bug is actually\n");
fprintf(STDERR,
" more complex than that, in some unspecified way.\n\n");
}
fprintf(STDERR,
" -e extension (used for creating output filename)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n e.g., -ext .new means *.png => *.new\n");
fprintf(STDERR,
" and -e _C.png means *.png => *_C.png\n\n");
}
fprintf(STDERR,
" -f user_filter [0-5]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n filter to use with the method specified in the\n");
fprintf(STDERR,
" preceding '-m method' argument.\n");
fprintf(STDERR,
" 0: none; 1-4: use specified filter; 5: adaptive.\n\n");
}
fprintf(STDERR,
" -force (Write a new output file even if larger than input)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Otherwise the input file will be copied to output\n");
fprintf(STDERR,
" if it is smaller than any generated file and no chunk\n");
fprintf(STDERR,
" additions, removals, or changes were requested.\n\n");
}
fprintf(STDERR,
" -g gamma_value (float, e.g., 0.45455)\n");
if(verbose > 1)
fprintf(STDERR,
"\n Value to insert in gAMA chunk, only if the input\n");
if(verbose > 1)
fprintf(STDERR,
" file has no gAMA chunk. To replace an existing\n");
if(verbose > 1)
fprintf(STDERR,
" gAMA chunk, use the '-replace_gamma' option.\n\n");
png_crush_pause();
fprintf(STDERR,
" -l zlib_compression_level [0-9]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n zlib compression level to use with method specified\n");
fprintf(STDERR,
" with the preceding '-m method' argument.\n\n");
}
fprintf(STDERR,
" -m method [0 through 200]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n %s method to try (0 means try all of 1-10).\n",progname);
fprintf(STDERR,
" Can be repeated as in '-m 1 -m 4 -m 7'.\n");
fprintf(STDERR,
" This can be useful if you run out of memory when %s\n",
progname);
fprintf(STDERR,
" tries methods 2, 3, 5, 6, 8, 9, or 10 which use \n");
fprintf(STDERR,
" filtering and are memory intensive. Methods\n");
fprintf(STDERR,
" 1, 4, and 7 use no filtering; methods 11 and up use \n");
fprintf(STDERR,
" specified filter, compression level, and strategy.\n\n");
png_crush_pause();
}
fprintf(STDERR,
" -max maximum_IDAT_size [1 through %d]\n",PNG_ZBUF_SIZE);
if(verbose > 1)
fprintf(STDERR,"\n");
fprintf(STDERR,
" -n (no save; does not do compression or write output PNG)\n");
if(verbose > 1)
fprintf(STDERR,
"\n Useful in conjunction with -v option to get info.\n\n");
fprintf(STDERR,
" -plte_len n (truncate PLTE)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Truncates the PLTE. Be sure not to truncate it to\n");
fprintf(STDERR,
"\n less than the greatest index present in IDAT.\n");
}
fprintf(STDERR,
" -q (quiet)\n");
if(verbose > 1)
fprintf(STDERR,"\n");
if(verbose > 1)
fprintf(STDERR,"\n");
fprintf(STDERR,
" -rem chunkname (or \"alla\" or \"allb\")\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Name of an ancillary chunk or optional PLTE to be\n");
fprintf(STDERR,
" removed. Be careful with this. Please don't use \n");
fprintf(STDERR,
" this feature to remove transparency, gamma, copyright,\n");
fprintf(STDERR,
" or other valuable information. To remove several\n");
fprintf(STDERR,
" different chunks, repeat: -rem tEXt -rem pHYs.\n");
fprintf(STDERR,
" Known chunks (those in the PNG 1.1 spec or extensions\n");
fprintf(STDERR,
" document) can be named with all lower-case letters,\n");
fprintf(STDERR,
" so \"-rem bkgd\" is equivalent to \"-rem bKGD\".\n");
fprintf(STDERR,
" Exact case is required to remove unknown chunks.\n");
fprintf(STDERR,
" \"-rem text\" also removes zTXt. If you like to do\n");
fprintf(STDERR,
" surgery with a chain-saw, \"-rem alla\" removes\n");
fprintf(STDERR,
" all known ancillary chunks except for tRNS, and\n");
fprintf(STDERR,
" \"-rem allb\" removes all but tRNS and gAMA.\n\n");
}
png_crush_pause();
fprintf(STDERR,
"-replace_gamma gamma_value (float) even when file has a gAMA chunk.\n");
if(verbose > 1)
fprintf(STDERR,"\n");
fprintf(STDERR,
" -res dpi\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Write a pHYs chunk with the given resolution.\n\n");
}
/*
fprintf(STDERR,
" -save chunkname\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Name of an otherwise unknown ancillary chunk that\n");
fprintf(STDERR,
" would be considered copy-unsafe. This option makes\n");
fprintf(STDERR,
" the chunk 'known' to %s, so it can be copied.\n\n",
progname);
}
*/
png_crush_pause();
fprintf(STDERR,
" -srgb [0, 1, 2, or 3]\n");
if(verbose > 1)
fprintf(STDERR,
"\n Value of 'rendering intent' for sRGB chunk.\n\n");
fprintf(STDERR,
" -text b[efore_IDAT]|a[fter_IDAT] \"keyword\" \"text\"\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n tEXt chunk to insert. keyword < 80 chars,\n");
fprintf(STDERR,
"\n text < 2048 chars. For now, you can only add ten\n");
fprintf(STDERR,
" tEXt or zTXt chunks per pngcrush run.\n\n");
}
fprintf(STDERR,
" -trns index red green blue gray\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Insert a tRNS chunk, if no tRNS chunk found in file.\n");
fprintf(STDERR,
" You must give all five parameters regardless of the\n");
fprintf(STDERR,
" color type, scaled to the output bit depth.\n\n");
}
fprintf(STDERR,
" -verbose (write more detailed information)\n");
if(verbose > 1)
fprintf(STDERR,
"\n Repeat the option (use \"-v -v\") for even more.\n\n");
fprintf(STDERR,
" -w compression_window_size [32, 16, 8, 4, 2, 1, 512, 256]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Size of the sliding compression window, in kbytes\n");
fprintf(STDERR,
" (or bytes, in case of 512 or 256). It's best to\n");
fprintf(STDERR,
" use the default (32) unless you run out of memory.\n");
fprintf(STDERR,
" The program will use a smaller window anyway when\n");
fprintf(STDERR,
" the uncompressed file is smaller than 16k.\n\n");
fprintf(STDERR,
" -z zlib_strategy [0, 1, or 2]\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n zlib compression strategy to use with the preceding\n");
fprintf(STDERR,
" '-m method' argument.\n\n");
}
#if 0
fprintf(STDERR,
" -ztxt b[efore_IDAT]|a[fter_IDAT] \"keyword\" \"text\"\n");
if(verbose > 1)
fprintf(STDERR,
"\n zTXt chunk to insert. keyword < 80 chars,\n");
fprintf(STDERR,
"\n text < 2048 chars. For now, you can only add ten\n");
fprintf(STDERR,
" tEXt or zTXt chunks per pngcrush run.\n\n");
#endif
png_crush_pause();
}
fprintf(STDERR,
" -h (help)\n");
if(verbose > 1)
fprintf(STDERR,
"\n Display this information.\n\n");
fprintf(STDERR,
" -p (pause)\n");
if(verbose > 1)
{
fprintf(STDERR,
"\n Wait for [enter] key before continuing display.\n");
fprintf(STDERR,
" e.g., type '%s -pause -help', if the help\n",progname);
fprintf(STDERR,
" screen scrolls out of sight.\n\n");
}
if(pngcrush_mode == DEFAULT_MODE && argc - names != 2 && nosave == 0)
exit(1);
}
for (ia=0; ia<255; ia++)
trns_array[ia]=255;
for(;;)
{
if(png_row_filters != NULL)
{
free(png_row_filters); png_row_filters=NULL;
}
output_color_type=force_output_color_type;
output_bit_depth=force_output_bit_depth;
if(pngcrush_mode == DIRECTORY_MODE || pngcrush_mode == EXTENSION_MODE)
inname=argv[names++];
if(inname == NULL)
{
if(verbose > 0) show_result();
return 0;
}
if(pngcrush_mode == EXTENSION_MODE)
{
ip=in_string;
in_string[0]='\0';
str_return = strcat(in_string,inname);
ip = in_string;
op = dot = out_string;
while(*ip != '\0')
{
*op++ = *ip++;
if(*ip == '.')dot=op;
}
*op = '\0';
if(dot != out_string)
*dot = '\0';
in_extension[0]='\0';
if(dot != out_string)
{
str_return = strcat(in_extension,++dot);
}
str_return = strcat(out_string,extension);
outname=out_string;
}
if(pngcrush_mode == DIRECTORY_MODE)
{
struct stat stat_buf;
if(stat(dirname, &stat_buf) != 0)
{
#ifdef _MBCS
if(_mkdir(dirname) != 0)
#else
if(mkdir(dirname, 0x1ed) != 0)
#endif
{
fprintf(STDERR,"could not create directory %s\n",dirname);
return 1;
}
}
out_string[0] = '\0';
str_return = strcat(out_string,dirname);
str_return = strcat(out_string,SLASH);
in_string[0] = '\0';
str_return = strcat(in_string,inname);
ip = op = in_string;
while(*ip != '\0')
{
if(*ip == '\\' || *ip == '/')op=ip+1;
ip++;
}
str_return = strcat(out_string,op);
outname=out_string;
}
if(nosave < 2)
{
png_debug1(0, "Opening file %s for length measurement\n",inname);
if ((fpin = FOPEN(inname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find file: %s\n", inname);
return 1;
}
number_of_open_files++;
idat_length[0]=measure_idats(fpin);
FCLOSE(fpin);
if(verbose > 0)
{
fprintf(STDERR," %s IDAT length in input file = %8lu\n",
inname,idat_length[0]);
fflush(STDERR);
}
if(idat_length[0] == 0) return 1;
#if 0
fpin = FOPEN(inname, "rb");
number_of_open_files++;
#endif
}
else
idat_length[0]=1;
if(!methods_specified || try_method[0] == 0)
{
for (i=1; i<=DEFAULT_METHODS; i++) try_method[i]=0;
try_method[6]=try_method[0];
}
best_of_three=1;
for(trial=1; trial<=MAX_METHODS; trial++)
{
idat_length[trial]=(png_uint_32)0xffffffff;
if(trial == MAX_METHODS)
{
png_uint_32 best_length;
/* check lengths */
best=0;
best_length=(png_uint_32)0xffffffff;
for (ntrial=things_have_changed; ntrial<MAX_METHODS; ntrial++)
if(idat_length[ntrial]<=best_length)
{
best_length=idat_length[ntrial];
best=ntrial;
}
if(idat_length[best] == idat_length[0] && things_have_changed == 0
&& best != final_method && nosave == 0)
{
/* just copy input to output */
if(verbose > 2)
printf("prepare to copy input to output\n");
png_crush_pause();
if ((fpin = FOPEN(inname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find input file %s\n", inname);
return 1;
}
number_of_open_files++;
if ((fpout = FOPEN(outname, "wb")) == NULL)
{
fprintf(STDERR, "Could not open output file %s\n", outname);
FCLOSE(fpin);
return 1;
}
number_of_open_files++;
if(verbose > 2)
printf("copying input to output...");
for(;;)
{
png_size_t num_in;
num_in = fread(buffer, 1, 1, fpin);
if (!num_in)
break;
fwrite(buffer, 1, 1, fpout);
}
if(verbose > 2)
printf("copy complete.\n");
png_crush_pause();
FCLOSE(fpin);
FCLOSE(fpout);
break;
}
if(best == final_method)
{
break;
}
else
{
filter_method=fm[best];
zlib_level=lv[best];
if(zs[best] == 0)z_strategy=Z_DEFAULT_STRATEGY;
if(zs[best] == 1)z_strategy=Z_FILTERED;
if(zs[best] == 2)z_strategy=Z_HUFFMAN_ONLY;
}
}
else
{
if(trial > 2 && trial < 5 && idat_length[trial-1]
< idat_length[best_of_three])best_of_three = trial-1;
if(try_method[trial])continue;
if(!methods_specified && try_method[0])
{
if((trial == 4 || trial == 7) && best_of_three != 1) continue;
if((trial == 5 || trial == 8) && best_of_three != 2) continue;
if((trial == 6 || trial == 9 || trial == 10) && best_of_three != 3)
continue;
}
filter_method=fm[trial];
zlib_level=lv[trial];
if(zs[trial] == 0)z_strategy=Z_DEFAULT_STRATEGY;
if(zs[trial] == 1)z_strategy=Z_FILTERED;
if(zs[trial] == 2)z_strategy=Z_HUFFMAN_ONLY;
final_method=trial;
if(verbose > 2 && nosave == 0)
printf(" Begin trial %d, filter %d, strategy %d, level %d\n",
trial, filter_method, z_strategy, zlib_level);
}
if(verbose > 2)
printf("prepare to open files.\n");
png_crush_pause();
if ((fpin = FOPEN(inname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find input file %s\n", inname);
return 1;
}
number_of_open_files++;
if(nosave == 0)
{
if ((fpout = FOPEN(outname, "wb")) == NULL)
{
fprintf(STDERR, "Could not open output file %s\n", outname);
FCLOSE(fpin);
return 1;
}
number_of_open_files++;
}
if(verbose > 2)
printf("files are opened.\n");
png_crush_pause();
png_debug(0, "Allocating read and write structures\n");
#ifdef PNG_USER_MEM_SUPPORTED
read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL);
#endif
#if defined(PNG_NO_STDIO)
png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error,
png_default_warning);
#endif
if(nosave == 0)
{
#ifdef PNG_USER_MEM_SUPPORTED
write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL);
#endif
#if defined(PNG_NO_STDIO)
png_set_error_fn(write_ptr, (png_voidp)outname, png_default_error,
png_default_warning);
#endif
}
png_debug(0, "Allocating read_info, write_info and end_info structures\n");
read_info_ptr = png_create_info_struct(read_ptr);
end_info_ptr = png_create_info_struct(read_ptr);
if(nosave == 0)
{
write_info_ptr = png_create_info_struct(write_ptr);
write_end_info_ptr = png_create_info_struct(write_ptr);
}
if(verbose > 2)
printf("structures created.\n");
png_crush_pause();
png_debug(0, "Setting jmpbuf for read and write structs\n");
#if defined(USE_FAR_KEYWORD)
if (setjmp(jmpbuf))
#else
if (setjmp(read_ptr->jmpbuf))
#endif
{
PNG_CRUSH_CLEANUP
}
#if defined(USE_FAR_KEYWORD)
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
if(nosave == 0)
png_memcpy(write_ptr->jmpbuf,read_ptr->jmpbuf,sizeof(jmp_buf));
if(verbose > 2)
printf("jmp_buf has been set.\n");
png_crush_pause();
png_debug(0, "Initializing input and output streams\n");
#if !defined(PNG_NO_STDIO)
png_init_io(read_ptr, fpin);
if(nosave == 0)
png_init_io(write_ptr, fpout);
#else
png_set_read_fn(read_ptr, (png_voidp)fpin, png_default_read_data);
if(nosave == 0)
png_set_write_fn(write_ptr, (png_voidp)fpout, png_default_write_data,
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_default_flush);
#else
NULL);
#endif
#endif
if(verbose > 2)
printf("io has been initialized.\n");
png_crush_pause();
/* We don't need to check CRC's because they were already checked
in the png_measure_idat function */
read_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN |
PNG_FLAG_CRC_ANCILLARY_USE |
PNG_FLAG_CRC_CRITICAL_IGNORE;
/* reinitialize zbuf - compression buffer */
if(read_ptr->zbuf_size < (png_size_t)max_idat_size)
{
if(verbose > 2)
printf("reinitializing read zbuf.\n");
png_free(read_ptr, read_ptr->zbuf);
read_ptr->zbuf_size = (png_size_t)max_idat_size;
read_ptr->zbuf =
(png_bytep)png_malloc(read_ptr, (png_uint_32)read_ptr->zbuf_size);
}
if(nosave == 0)
if(write_ptr->zbuf_size > (png_size_t)max_idat_size)
{
if(verbose > 2)
printf("reinitializing write zbuf.\n");
png_free(write_ptr, write_ptr->zbuf);
write_ptr->zbuf_size = (png_size_t)max_idat_size;
write_ptr->zbuf =
(png_bytep)png_malloc(write_ptr, (png_uint_32)write_ptr->zbuf_size);
}
png_debug(0, "Reading info struct\n");
png_read_info(read_ptr, read_info_ptr);
png_debug(0, "Transferring info struct\n");
{
int interlace_type, compression_type, filter_type;
if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
&color_type, &interlace_type, &compression_type, &filter_type))
{
int compression_window=default_compression_window;
int need_expand = 0;
input_color_type=color_type;
input_bit_depth=bit_depth;
if(verbose > 1 && trial == 1)
{
fprintf(STDERR, " IHDR chunk data:\n");
fprintf(STDERR, " Width=%ld, height=%ld\n", width, height);
fprintf(STDERR, " Bit depth =%d\n", bit_depth);
fprintf(STDERR, " Color type=%d\n", color_type);
fprintf(STDERR, " Interlace =%d\n", interlace_type);
}
if(output_color_type > 7)
{
output_color_type=input_color_type;
}
#ifndef PNG_WRITE_PACK_SUPPORTED
if(output_bit_depth == 0)
#endif
{
output_bit_depth=input_bit_depth;
}
if(output_bit_depth != input_bit_depth)
need_expand = 1;
if((color_type == 2 || color_type == 6 || color_type == 3) &&
(output_color_type == 0 || output_color_type == 4))
{
png_set_rgb_to_gray(read_ptr, 1, 54./255., 183./255.);
if(output_bit_depth < 8)output_bit_depth=8;
if(color_type == 3) need_expand = 1;
}
if(color_type != 3 && output_color_type == 3)
{
printf(" Cannot change to indexed color (color_type 3)\n");
output_color_type=input_color_type;
}
if((color_type == 0 || color_type == 4) &&
(output_color_type == 2 || output_color_type == 6))
{
png_set_gray_to_rgb(read_ptr);
}
if((color_type == 4 || color_type == 6) &&
(output_color_type != 4 && output_color_type != 6))
{
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Stripping existing alpha channel.\n");
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
png_set_strip_alpha(read_ptr);
#endif
}
if((output_color_type == 4 || output_color_type == 6) &&
(color_type != 4 && color_type != 6))
{
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Adding an alpha channel.\n");
#ifdef PNG_READ_FILLER_SUPPORTED
png_set_filler(read_ptr, (png_uint_32)65535, PNG_FILLER_AFTER);
#endif
need_expand = 1;
}
if(output_color_type != 0 && output_color_type != 3 &&
output_bit_depth < 8) output_bit_depth = 8;
if((output_color_type == 2 || output_color_type == 6) &&
color_type == 3)
{
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Expanding indexed color file.\n");
need_expand = 1;
}
#ifdef PNG_READ_EXPAND_SUPPORTED
if (need_expand == 1)
png_set_expand(read_ptr);
#endif
if(nosave == 0)
{
int required_window;
int channels=0;
write_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
write_ptr->zlib_strategy = z_strategy;
if (output_color_type == 0)channels=1;
if (output_color_type == 2)channels=3;
if (output_color_type == 3)channels=1;
if (output_color_type == 4)channels=2;
if (output_color_type == 6)channels=4;
required_window=(int)(height*((width*channels*bit_depth+15)>>3));
if (required_window <= 256)compression_window = 8;
else if(required_window <= 512)compression_window = 9;
else if(required_window <= 1024)compression_window = 10;
else if(required_window <= 2048)compression_window = 11;
else if(required_window <= 4096)compression_window = 12;
else if(required_window <= 8192)compression_window = 13;
else if(required_window <= 16386)compression_window = 14;
else compression_window = 15;
if(compression_window > default_compression_window ||
force_compression_window)
compression_window = default_compression_window;
if(verbose > 1 && trial == 1 && (compression_window != 15 ||
force_compression_window))
fprintf(STDERR, " Compression window for output= %d\n",
1 << compression_window);
png_set_compression_window_bits(write_ptr, compression_window);
}
if(verbose > 1)
fprintf(STDERR, " Setting IHDR\n");
png_set_IHDR(write_ptr, write_info_ptr, width, height,
output_bit_depth, output_color_type, interlace_type,
compression_type, filter_type);
if(output_color_type != input_color_type) things_have_changed++;
}
}
#if defined(PNG_READ_bKGD_SUPPORTED) && defined(PNG_WRITE_bKGD_SUPPORTED)
{
png_color_16p background;
if (!have_bkgd && png_get_bKGD(read_ptr, read_info_ptr, &background))
{
if(keep_chunk("bKGD",argv))
{
if((input_color_type == 2 || input_color_type == 6 ) &&
(output_color_type == 0 || output_color_type == 4))
background->gray = background->green;
png_set_bKGD(write_ptr, write_info_ptr, background);
}
}
if (have_bkgd)
{
png_color_16 backgd;
png_color_16p background = &backgd;
background->red=bkgd_red;
background->green=bkgd_green;
background->blue=bkgd_blue;
background->gray = background->green;
png_set_bKGD(write_ptr, write_info_ptr, background);
}
}
#endif
#if defined(PNG_READ_cHRM_SUPPORTED) && defined(PNG_WRITE_cHRM_SUPPORTED)
{
double white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
&red_y, &green_x, &green_y, &blue_x, &blue_y))
{
if(keep_chunk("cHRM",argv))
png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
red_y, green_x, green_y, blue_x, blue_y);
}
}
#endif
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_WRITE_gAMA_SUPPORTED)
{
if(force_specified_gamma > 0.)
{
if(trial == 1)
{
things_have_changed=1;
if(verbose > 0)
fprintf(STDERR, " Inserting gAMA chunk with gamma=%f\n",
force_specified_gamma);
}
png_set_gAMA(write_ptr, write_info_ptr, force_specified_gamma);
file_gamma=force_specified_gamma;
}
else if (png_get_gAMA(read_ptr, read_info_ptr, &file_gamma))
{
if(keep_chunk("gAMA",argv))
{
if(verbose > 1 && trial == 1)
fprintf(STDERR, " gamma=%f\n", file_gamma);
if(double_gamma)file_gamma+=file_gamma;
png_set_gAMA(write_ptr, write_info_ptr, file_gamma);
}
}
else if(specified_gamma > 0.)
{
if(trial == 1)
{
things_have_changed=1;
if(verbose > 0)
fprintf(STDERR, " Inserting gAMA chunk with gamma=%f\n",
specified_gamma);
}
png_set_gAMA(write_ptr, write_info_ptr, specified_gamma);
file_gamma=specified_gamma;
}
}
#endif
#if defined(PNG_READ_sRGB_SUPPORTED) && defined(PNG_WRITE_sRGB_SUPPORTED)
{
int file_intent;
if (png_get_sRGB(read_ptr, read_info_ptr, &file_intent))
{
if(keep_chunk("sRGB",argv))
png_set_sRGB(write_ptr, write_info_ptr, file_intent);
}
else if(intent >= 0)
{
if((int)(file_gamma*100 + .1) == 45)
{
things_have_changed=1;
if(trial == 1)
fprintf(STDERR, " Inserting sRGB chunk with intent=%d\n",intent);
png_set_sRGB(write_ptr, write_info_ptr, intent);
}
else if((int)(file_gamma*100) == 0)
{
things_have_changed=1;
png_set_sRGB_gAMA_and_cHRM(write_ptr, write_info_ptr, intent);
}
else
{
if(trial == 1)
{
fprintf(STDERR,
" Ignoring sRGB request because gamma=%f is not approx. 0.45\n",
file_gamma);
}
}
}
}
#endif
#if defined(PNG_READ_hIST_SUPPORTED) && defined(PNG_WRITE_hIST_SUPPORTED)
{
png_uint_16p hist;
if (png_get_hIST(read_ptr, read_info_ptr, &hist))
{
if(keep_chunk("hIST",argv))
png_set_hIST(write_ptr, write_info_ptr, hist);
}
}
#endif
#if defined(PNG_READ_oFFs_SUPPORTED) && defined(PNG_WRITE_oFFs_SUPPORTED)
{
png_int_32 offset_x, offset_y;
int unit_type;
if (png_get_oFFs(read_ptr, read_info_ptr,&offset_x,&offset_y,&unit_type))
{
if(offset_x == 0 && offset_y == 0)
{
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Deleting useless oFFs 0 0 chunk\n");
}
else
{
if(keep_chunk("oFFs",argv))
png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y,
unit_type);
}
}
}
#endif
#if defined(PNG_READ_pCAL_SUPPORTED) && defined(PNG_WRITE_pCAL_SUPPORTED)
{
png_charp purpose, units;
png_charpp params;
png_int_32 X0, X1;
int type, nparams;
if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
&nparams, &units, &params))
{
if(keep_chunk("pCAL",argv))
png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
nparams, units, params);
}
}
#endif
#if defined(PNG_READ_pHYs_SUPPORTED) && defined(PNG_WRITE_pHYs_SUPPORTED)
{
png_uint_32 res_x, res_y;
int unit_type;
if(resolution == 0)
{
if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y,
&unit_type))
{
if(keep_chunk("pHYs",argv))
png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
}
}
else
{
unit_type=1;
res_x = res_y = (png_uint_32)((resolution/.0254 + 0.5));
png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
if(verbose > 0 && trial == 1)
fprintf(STDERR, " Added pHYs %lu %lu 1 chunk\n",res_x,res_y);
}
}
#endif
#if defined(PNG_READ_tRNS_SUPPORTED) && defined(PNG_WRITE_tRNS_SUPPORTED)
{
png_bytep trans;
int num_trans;
png_color_16p trans_values;
if (png_get_tRNS(read_ptr, read_info_ptr, &trans, &num_trans,
&trans_values))
{
if(verbose > 1)
fprintf(STDERR," Got tRNS chunk.\n");
if(keep_chunk("tRNS",argv))
{
int last_nonmax = -1;
trns_red = trans_values->red;
trns_green = trans_values->green;
trns_blue = trans_values->blue;
trns_gray = trans_values->gray;
if(output_color_type == 3)
{
if(verbose > 2)
fprintf(STDERR," Filling trns_array\n");
for (ia=0;ia<num_trans;ia++)
trns_array[ia]=trans[ia];
if(verbose > 2)
fprintf(STDERR," Extending trns_array\n");
for ( ; ia<256; ia++)
trns_array[ia]=255;
if(verbose > 2)
fprintf(STDERR," Done filling trns_array\n");
for (ia=0; ia<256; ia++)
{
if(trns_array[ia] != 255)
last_nonmax=ia;
}
num_trans = last_nonmax+1;
if(num_trans == 0 && verbose > 0)
fprintf(STDERR," Deleting all-opaque tRNS chunk.\n");
}
if(verbose > 1)
fprintf(STDERR," png_set_tRNS, num_trans=%d\n",num_trans);
if (output_color_type != 3 || num_trans)
png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
trans_values);
}
}
else if (have_trns == 1) /* will not overwrite existing trns data */
{
png_color_16 trans_data;
png_byte index_data = (png_byte)trns_index;
num_trans = index_data+1;
if(verbose > 1)
fprintf(STDERR,"Have_tRNS, num_trans=%d\n",num_trans);
for (ia=0;ia<256;ia++)
trns_array[ia]=255;
trns_array[index_data]=0;
trans_data.index = index_data;
trans_data.red = trns_red;
trans_data.green = trns_green;
trans_data.blue = trns_blue;
trans_data.gray = trns_gray;
trans_values = &trans_data;
if(verbose > 1)
fprintf(STDERR,"png_set_tRNS\n");
png_set_tRNS(write_ptr, write_info_ptr, trns_array, num_trans,
trans_values);
things_have_changed=1;
}
else
{
for (i=0 ; ia<256; ia++)
trns_array[ia]=255;
}
if (verbose > 1 && trial == 1)
{
int last=-1;
for (i=0 ; ia<num_palette; ia++)
if(trns_array[ia] != 255) last = ia;
if(last >= 0)
{
fprintf(STDERR, " Transparency:\n");
if(output_color_type == 3)
for (i=0 ; ia<num_palette; ia++)
fprintf(STDERR, " %4d %4d\n",ia,trns_array[ia]);
else if(output_color_type == 0)
fprintf(STDERR, " %d\n",trns_gray);
else if(output_color_type == 2)
fprintf(STDERR, " %d %d %d\n",
trns_red, trns_green, trns_blue);
}
}
}
#endif
if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
{
if (plte_len > 0)
num_palette=plte_len;
if(output_color_type == 3)
png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
else if(keep_chunk("PLTE",argv))
png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
if(verbose > 1 && trial == 1)
{
int i;
png_colorp p = palette;
fprintf(STDERR, " Palette:\n");
fprintf(STDERR, " I R G B ( color ) A\n");
for (i=0; i<num_palette; i++)
{
fprintf(STDERR, " %4d %4d %4d %4d (#%2.2x%2.2x%2.2x) %4d\n",
i, p->red, p->green, p->blue,
p->red, p->green, p->blue,
trns_array[i]);
p++;
}
}
}
#if defined(PNG_READ_sBIT_SUPPORTED) && defined(PNG_WRITE_sBIT_SUPPORTED)
{
png_color_8p sig_bit;
if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
{
if(keep_chunk("sBIT",argv))
{
if((input_color_type == 0 || input_color_type == 4) &&
(output_color_type == 2 || output_color_type == 6 ||
output_color_type == 3))
sig_bit->red = sig_bit->green = sig_bit->blue
= sig_bit->gray;
if((input_color_type == 2 || input_color_type == 6 ||
output_color_type == 3) &&
(output_color_type == 0 || output_color_type == 4))
sig_bit->gray = sig_bit->green;
png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
}
}
}
#endif
#if (defined(PNG_READ_tEXt_SUPPORTED) && defined(PNG_WRITE_tEXt_SUPPORTED)) || \
(defined(PNG_READ_zTXt_SUPPORTED) && defined(PNG_WRITE_zTXt_SUPPORTED))
{
png_textp text_ptr;
int num_text=0;
if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0 ||
text_inputs != 0)
{
int ntext;
png_debug1(0, "Handling %d tEXt/zTXt chunks\n", num_text);
if (verbose > 1 && trial == 1 && num_text > 0)
{
fprintf(STDERR,"before IDAT, num_text= %d",num_text);
for (ntext = 0; ntext < num_text; ntext++)
{
fprintf(STDERR,"%d %s: ",ntext,text_ptr[ntext].key);
fprintf(STDERR,"%s\n",text_ptr[ntext].text);
}
}
if(num_text > 0)
{
if(keep_chunk("tEXt/zTXt",argv))
png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
}
for (ntext=0; ntext<text_inputs; ntext++)
{
if(text_where[ntext] == 1)
{
png_textp added_text;
added_text = (png_textp)
png_malloc(write_ptr, (png_uint_32)sizeof(png_text));
added_text[0].key = &text_keyword[ntext*80];
added_text[0].text = &text_text[ntext*2048];
added_text[0].compression = text_compression[ntext];
added_text[0].text_length = (png_size_t)strlen
(&text_text[ntext*2048]);
png_set_text(write_ptr, write_info_ptr, added_text, 1);
png_free(write_ptr,added_text);
}
}
}
}
#endif
#if defined(PNG_READ_tIME_SUPPORTED) && defined(PNG_WRITE_tIME_SUPPORTED)
{
png_timep mod_time;
if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))
{
if(keep_chunk("tIME",argv))
png_set_tIME(write_ptr, write_info_ptr, mod_time);
}
}
#endif
png_read_transform_info(read_ptr, read_info_ptr);
if(nosave == 0)
{
png_set_compression_level(write_ptr, zlib_level);
if (filter_method == 0)png_set_filter(write_ptr,0,PNG_FILTER_NONE);
else if(filter_method == 1)png_set_filter(write_ptr,0,PNG_FILTER_SUB);
else if(filter_method == 2)png_set_filter(write_ptr,0,PNG_FILTER_UP);
else if(filter_method == 3)png_set_filter(write_ptr,0,PNG_FILTER_AVG);
else if(filter_method == 4)png_set_filter(write_ptr,0,PNG_FILTER_PAETH);
else if(filter_method == 5)png_set_filter(write_ptr,0,PNG_ALL_FILTERS);
else png_set_filter(write_ptr,0,PNG_FILTER_NONE);
if(verbose > 2)
printf("writing info structure.\n");
png_crush_pause();
png_debug(0, "\nWriting info struct\n");
png_write_info(write_ptr, write_info_ptr);
png_debug(0, "\nWrote info struct\n");
if(verbose > 2)
printf("wrote info structure.\n");
png_crush_pause();
#ifdef PNG_WRITE_PACK_SUPPORTED
if(output_bit_depth < input_bit_depth)
{
png_color_8 true_bits;
write_ptr->bit_depth=output_bit_depth;
true_bits.gray = 8 - (input_bit_depth - output_bit_depth);
png_set_shift(read_ptr, &true_bits);
png_set_packing(write_ptr);
}
#endif
} /* no save */
#define LARGE_PNGCRUSH
#ifndef LARGE_PNGCRUSH
{
png_uint_32 rowbytes_s;
png_uint_32 rowbytes;
rowbytes = png_get_rowbytes(read_ptr, read_info_ptr);
rowbytes_s = (png_size_t)rowbytes;
if(rowbytes == (png_uint_32)rowbytes_s)
row_buf = png_malloc(read_ptr, rowbytes+2 );
else
{
fprintf(STDERR, "rowbytes= %d\n",rowbytes);
row_buf = NULL;
}
}
#else
{
png_uint_32 read_row_length, write_row_length, row_length;
read_row_length=
(png_uint_32)(png_get_rowbytes(read_ptr, read_info_ptr));
write_row_length=
(png_uint_32)(png_get_rowbytes(write_ptr, write_info_ptr));
row_length = read_row_length > write_row_length ?
read_row_length : write_row_length;
row_buf = (png_bytep)png_malloc(read_ptr,row_length+16);
}
#endif
if (row_buf == NULL)
{
fprintf(STDERR, "Insufficient memory to allocate row buffer\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, (png_infopp)NULL);
png_destroy_write_struct(&write_ptr, &write_info_ptr);
if(png_row_filters != NULL)
{
free(png_row_filters); png_row_filters=NULL;
}
FCLOSE(fpin);
FCLOSE(fpout);
return 1;
}
{
/* check for sufficient memory: we need 2*zlib_window
and, if filter_method == 5, 4*rowbytes in separate allocations.
If it's not enough we can drop the "average" filter and
we can reduce the zlib_window for writing. We can't change
the input zlib_window because the input file might have
used the full 32K sliding window.
*/
}
if(verbose > 2) printf("allocated rowbuf.\n");
png_crush_pause();
num_pass = png_set_interlace_handling(read_ptr);
if(nosave == 0)
png_set_interlace_handling(write_ptr);
t_stop = (float)clock();
t_misc += (t_stop - t_start);
t_start = t_stop;
for (pass = 0; pass < num_pass; pass++)
{
png_debug(0, "\nBegin Pass\n");
for (y = 0; y < height; y++)
{
png_read_rows(read_ptr, (png_bytepp)&row_buf, (png_bytepp)NULL, 1);
if(nosave == 0)
{
t_stop = (float)clock();
t_decode += (t_stop - t_start);
t_start = t_stop;
png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
t_stop = (float)clock();
t_encode += (t_stop - t_start);
t_start = t_stop;
}
}
png_debug(0, "\nEnd Pass\n");
}
if(nosave)
{
t_stop = (float)clock();
t_decode += (t_stop - t_start);
t_start = t_stop;
}
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if((color_type == 2 || color_type == 6 || color_type == 3) &&
(output_color_type == 0 || output_color_type == 4))
{
png_byte rgb_error = png_get_rgb_to_gray_status(read_ptr);
if((trial == 1) && rgb_error)
printf(" **** Converted non-gray image to gray. **** \n");
}
#endif
png_debug(0, "Reading and writing end_info data\n");
png_read_end(read_ptr, end_info_ptr);
#if (defined(PNG_READ_tEXt_SUPPORTED) && defined(PNG_WRITE_tEXt_SUPPORTED)) || \
(defined(PNG_READ_zTXt_SUPPORTED) && defined(PNG_WRITE_zTXt_SUPPORTED))
{
png_textp text_ptr;
int num_text=0;
if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0 ||
text_inputs != 0)
{
int ntext;
png_debug1(0, "Handling %d tEXt/zTXt chunks\n", num_text);
if (verbose > 1 && trial == 1 && num_text > 0)
{
for (ntext = 0; ntext < num_text; ntext++)
{
fprintf(STDERR,"%d %s: ",ntext,text_ptr[ntext].key);
fprintf(STDERR,"%s\n",text_ptr[ntext].text);
}
}
if(num_text > 0)
{
if(keep_chunk("tEXt/zTXt",argv))
png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
}
for (ntext=0; ntext<text_inputs; ntext++)
{
if(text_where[ntext] == 2)
{
png_textp added_text;
added_text = (png_textp)
png_malloc(write_ptr, (png_uint_32)sizeof(png_text));
added_text[0].key = &text_keyword[ntext*80];
added_text[0].text = &text_text[ntext*2048];
added_text[0].compression = text_compression[ntext];
added_text[0].text_length = (png_size_t)strlen
(&text_text[ntext*2048]);
png_set_text(write_ptr, write_end_info_ptr, added_text, 1);
png_free(write_ptr,added_text);
}
}
}
}
#endif
#if defined(PNG_READ_tIME_SUPPORTED) && defined(PNG_WRITE_tIME_SUPPORTED)
{
png_timep mod_time;
if (png_get_tIME(read_ptr, end_info_ptr, &mod_time))
{
if(keep_chunk("tIME",argv))
png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
}
}
#endif
if(nosave == 0)
png_write_end(write_ptr, write_end_info_ptr);
png_debug(0, "Destroying data structs\n");
if(row_buf != (png_bytep)NULL)
png_free(read_ptr, row_buf);
row_buf = (png_bytep)NULL;
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
if(nosave == 0)
{
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
}
if(nosave == 0)
{
png_destroy_write_struct(&write_ptr, &write_info_ptr);
}
read_ptr=NULL;
write_ptr=NULL;
FCLOSE(fpin);
if(nosave == 0)
FCLOSE(fpout);
if(nosave != 0)
break;
if (nosave == 0)
{
png_debug(0, "Opening file for length measurement\n");
if ((fpin = FOPEN(outname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find file %s\n", outname);
if(png_row_filters != NULL)
{
free(png_row_filters); png_row_filters=NULL;
}
return 1;
}
number_of_open_files++;
idat_length[trial]=measure_idats(fpin);
FCLOSE(fpin);
}
if(verbose > 0 && trial != MAX_METHODS)
{
fprintf(STDERR,
" IDAT length with method %d (fm %d zl %d zs %d)= %8lu\n",
trial,filter_method,zlib_level,z_strategy,idat_length[trial]);
fflush(STDERR);
}
} /* end of trial-loop */
if (fpin)
{
FCLOSE(fpin);
}
if (nosave == 0 && fpout)
{
FCLOSE(fpout);
}
if(verbose > 0 && nosave == 0)
{
png_uint_32 input_length, output_length;
struct stat stat_buf;
stat(inname, &stat_buf);
input_length = (unsigned long)stat_buf.st_size;
total_input_length += input_length;
stat(outname, &stat_buf);
output_length = (unsigned long)stat_buf.st_size;
total_output_length += output_length;
if(input_length == output_length)
fprintf(STDERR,
" Best %s method = %d for %s (no change)\n\n",
progname, best, outname);
else if(input_length > output_length)
fprintf(STDERR,
" Best %s method = %d for %s (%4.2f%% reduction)\n\n",
progname, best, outname,
(100.0 - (100.0*output_length)/input_length));
else
fprintf(STDERR,
" Best %s method = %d for %s (%4.2f%% increase)\n\n",
progname, best, outname,
-(100.0 - (100.0*output_length)/input_length));
if(verbose > 2)
fprintf(STDERR, " Number of open files=%d\n",number_of_open_files);
}
if(pngcrush_mode == DEFAULT_MODE)
{
if(png_row_filters != NULL)
{
free(png_row_filters); png_row_filters=NULL;
}
if(verbose > 0) show_result();
return 0;
}
}
}
png_uint_32
measure_idats(FILE *fpin)
{
png_uint_32 measured_idat_length;
if(verbose > 2)
printf("measure_idats:\n");
png_debug(0, "Allocating read structure\n");
read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL);
#if defined(PNG_NO_STDIO)
png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error, png_default_warning);
#endif
png_debug(0, "Allocating read_info, end_info structures\n");
read_info_ptr = png_create_info_struct(read_ptr);
end_info_ptr = png_create_info_struct(read_ptr);
png_debug(0, "Setting jmpbuf for read struct\n");
#if defined(USE_FAR_KEYWORD)
if (setjmp(jmpbuf))
#else
if (setjmp(read_ptr->jmpbuf))
#endif
{
PNG_CRUSH_CLEANUP
if(verbose > 2)
fprintf(STDERR, "returning from measure_idats after longjump\n");
return 0;
}
#if defined(USE_FAR_KEYWORD)
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#if !defined(PNG_NO_STDIO)
png_init_io(read_ptr, fpin);
#else
png_set_read_fn(read_ptr, (png_voidp)fpin, png_default_read_data);
#endif
measured_idat_length=0;
read_ptr->sig_bytes=0;
measured_idat_length=png_measure_idat(read_ptr, read_info_ptr);
if(verbose > 2)
printf("measure_idats: IDAT length=%lu\n",measured_idat_length);
png_debug(0, "Destroying data structs\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
return measured_idat_length;
}
png_uint_32
png_measure_idat(png_structp png_ptr, png_infop info_ptr)
{
png_uint_32 sum_idat_length=0;
png_debug(1, "in png_read_info\n");
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
{
png_size_t num_checked = png_ptr->sig_bytes,
num_to_check = 8 - num_checked;
png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
png_ptr->sig_bytes = 8;
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
{
if (num_checked < 4 &&
png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
png_error(png_ptr, "Not a PNG file");
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
}
for(;;)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
PNG_IEND;
#endif
png_byte chunk_length[4];
png_byte chunk_name[5];
png_uint_32 length;
png_read_data(png_ptr, chunk_length, 4);
length = png_get_uint_32(chunk_length);
png_reset_crc(png_ptr);
png_crc_read(png_ptr, chunk_name, 4);
if (!png_memcmp(chunk_name, png_IDAT, 4))
sum_idat_length += length;
if(verbose > 1)
{
chunk_name[4]='\0';
printf( "Reading %s chunk, length = %ld.\n", chunk_name, length);
}
png_crc_finish(png_ptr, length);
if (!png_memcmp(chunk_name, png_IEND, 4))
return sum_idat_length;
}
}
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