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pngcp.c
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/* pngcp.c
*
* Copyright (c) 2016 John Cunningham Bowler
*
* Last changed in libpng 1.6.24 [August 4, 2016]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This is an example of copying a PNG without changes using the png_read_png
* and png_write_png interfaces. A considerable number of options are provided
* to manipulate the compression of the PNG data and other compressed chunks.
*
* For a more extensive example that uses the transforms see
* contrib/libtests/pngimage.c in the libpng distribution.
*/
#include "pnglibconf.h" /* To find how libpng was configured. */
#ifdef PNG_PNGCP_TIMING_SUPPORTED
/* WARNING:
*
* This test is here to allow POSIX.1b extensions to be used if enabled in
* the compile; specifically the code requires_POSIX_C_SOURCE support of
* 199309L or later to enable clock_gettime use.
*
* IF this causes problems THEN compile with a strict ANSI C compiler and let
* this code turn on the POSIX features that it minimally requires.
*
* IF this does not work there is probably a bug in your ANSI C compiler or
* your POSIX implementation.
*/
# define _POSIX_C_SOURCE 199309L
#else /* No timing support required */
# define _POSIX_SOURCE 1
#endif
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
# include <config.h>
#endif
#include <stdio.h>
/* Define the following to use this test against your installed libpng, rather
* than the one being built here:
*/
#ifdef PNG_FREESTANDING_TESTS
# include <png.h>
#else
# include "../../png.h"
#endif
#if PNG_LIBPNG_VER < 10700
/* READ_PNG and WRITE_PNG were not defined, so: */
# ifdef PNG_INFO_IMAGE_SUPPORTED
# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
# define PNG_READ_PNG_SUPPORTED
# endif /* SEQUENTIAL_READ */
# ifdef PNG_WRITE_SUPPORTED
# define PNG_WRITE_PNG_SUPPORTED
# endif /* WRITE */
# endif /* INFO_IMAGE */
#endif /* pre 1.7.0 */
#if (defined(PNG_READ_PNG_SUPPORTED)) && (defined(PNG_WRITE_PNG_SUPPORTED))
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <assert.h>
#include <unistd.h>
#include <sys/stat.h>
#include <zlib.h>
#ifndef PNG_SETJMP_SUPPORTED
# include <setjmp.h> /* because png.h did *not* include this */
#endif
#ifdef __cplusplus
# define voidcast(type, value) static_cast<type>(value)
#else
# define voidcast(type, value) (value)
#endif /* __cplusplus */
#ifdef __GNUC__
/* Many versions of GCC erroneously report that local variables unmodified
* within the scope of a setjmp may be clobbered. This hacks round the
* problem (sometimes) without harming other compilers.
*/
# define gv volatile
#else
# define gv
#endif
/* 'CLOCK_PROCESS_CPUTIME_ID' is one of the clock timers for clock_gettime. It
* need not be supported even when clock_gettime is available. It returns the
* 'CPU' time the process has consumed. 'CPU' time is assumed to include time
* when the CPU is actually blocked by a pending cache fill but not time
* waiting for page faults. The attempt is to get a measure of the actual time
* the implementation takes to read a PNG ignoring the potentially very large IO
* overhead.
*/
#ifdef PNG_PNGCP_TIMING_SUPPORTED
# include <time.h> /* clock_gettime and associated definitions */
# ifndef CLOCK_PROCESS_CPUTIME_ID
/* Prevent inclusion of the spurious code: */
# undef PNG_PNGCP_TIMING_SUPPORTED
# endif
#endif /* PNGCP_TIMING */
/* So if the timing feature has been activated: */
/* This structure is used to control the test of a single file. */
typedef enum
{
VERBOSE, /* switches on all messages */
INFORMATION,
WARNINGS, /* switches on warnings */
LIBPNG_WARNING,
APP_WARNING,
ERRORS, /* just errors */
APP_FAIL, /* continuable error - no need to longjmp */
LIBPNG_ERROR, /* this and higher cause a longjmp */
LIBPNG_BUG, /* erroneous behavior in libpng */
APP_ERROR, /* such as out-of-memory in a callback */
QUIET, /* no normal messages */
USER_ERROR, /* such as file-not-found */
INTERNAL_ERROR
} error_level;
#define LEVEL_MASK 0xf /* where the level is in 'options' */
#define STRICT 0x010 /* Fail on warnings as well as errors */
#define LOG 0x020 /* Log pass/fail to stdout */
#define CONTINUE 0x040 /* Continue on APP_FAIL errors */
#define SIZES 0x080 /* Report input and output sizes */
#define SEARCH 0x100 /* Search IDAT compression options */
#define NOWRITE 0x200 /* Do not write an output file */
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
# define IGNORE_INDEX 0x400 /* Ignore out of range palette indices (BAD!) */
# ifdef PNG_GET_PALETTE_MAX_SUPPORTED
# define FIX_INDEX 0x800 /* 'Fix' out of range palette indices (OK) */
# endif /* GET_PALETTE_MAX */
#endif /* CHECK_FOR_INVALID_INDEX */
#define OPTION 0x80000000 /* Used for handling options */
#define LIST 0x80000001 /* Used for handling options */
/* Result masks apply to the result bits in the 'results' field below; these
* bits are simple 1U<<error_level. A pass requires either nothing worse than
* warnings (--relaxes) or nothing worse than information (--strict)
*/
#define RESULT_STRICT(r) (((r) & ~((1U<<WARNINGS)-1)) == 0)
#define RESULT_RELAXED(r) (((r) & ~((1U<<ERRORS)-1)) == 0)
/* OPTION DEFINITIONS */
static const char range_lo[] = "low";
static const char range_hi[] = "high";
static const char all[] = "all";
#define RANGE(lo,hi) { range_lo, lo }, { range_hi, hi }
typedef struct value_list
{
const char *name; /* the command line name of the value */
int value; /* the actual value to use */
} value_list;
static const value_list
#ifdef PNG_SW_COMPRESS_png_level
vl_compression[] =
{
/* Overall compression control. The order controls the search order for
* 'all'. Since the search is for the smallest the order used is low memory
* then high speed.
*/
{ "low-memory", PNG_COMPRESSION_LOW_MEMORY },
{ "high-speed", PNG_COMPRESSION_HIGH_SPEED },
{ "high-read-speed", PNG_COMPRESSION_HIGH_READ_SPEED },
{ "low", PNG_COMPRESSION_LOW },
{ "medium", PNG_COMPRESSION_MEDIUM },
{ "old", PNG_COMPRESSION_COMPAT },
{ "high", PNG_COMPRESSION_HIGH },
{ all, 0 }
},
#endif /* SW_COMPRESS_png_level */
#if defined(PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED) ||\
defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED)
vl_strategy[] =
{
/* This controls the order of search. */
{ "huffman", Z_HUFFMAN_ONLY },
{ "RLE", Z_RLE },
{ "fixed", Z_FIXED }, /* the remainder do window searches */
{ "filtered", Z_FILTERED },
{ "default", Z_DEFAULT_STRATEGY },
{ all, 0 }
},
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
vl_windowBits_text[] =
{
{ "default", MAX_WBITS/*from zlib*/ },
{ "minimum", 8 },
RANGE(8, MAX_WBITS/*from zlib*/),
{ all, 0 }
},
#endif /* text compression */
vl_level[] =
{
{ "default", Z_DEFAULT_COMPRESSION /* this is -1 */ },
{ "none", Z_NO_COMPRESSION },
{ "speed", Z_BEST_SPEED },
{ "best", Z_BEST_COMPRESSION },
{ "0", Z_NO_COMPRESSION },
RANGE(1, 9), /* this deliberately excludes '0' */
{ all, 0 }
},
vl_memLevel[] =
{
{ "max", MAX_MEM_LEVEL }, /* zlib maximum */
{ "1", 1 }, /* zlib minimum */
{ "default", 8 }, /* zlib default */
{ "2", 2 },
{ "3", 3 },
{ "4", 4 },
{ "5", 5 }, /* for explicit testing */
RANGE(6, MAX_MEM_LEVEL/*zlib*/), /* exclude 5 and below: zlib bugs */
{ all, 0 }
},
#endif /* WRITE_CUSTOMIZE_*COMPRESSION */
#ifdef PNG_WRITE_FILTER_SUPPORTED
vl_filter[] =
{
{ all, PNG_ALL_FILTERS },
{ "off", PNG_NO_FILTERS },
{ "none", PNG_FILTER_NONE },
{ "sub", PNG_FILTER_SUB },
{ "up", PNG_FILTER_UP },
{ "avg", PNG_FILTER_AVG },
{ "paeth", PNG_FILTER_PAETH }
},
#endif /* WRITE_FILTER */
#ifdef PNG_PNGCP_TIMING_SUPPORTED
# define PNGCP_TIME_READ 1
# define PNGCP_TIME_WRITE 2
vl_time[] =
{
{ "both", PNGCP_TIME_READ+PNGCP_TIME_WRITE },
{ "off", 0 },
{ "read", PNGCP_TIME_READ },
{ "write", PNGCP_TIME_WRITE }
},
#endif /* PNGCP_TIMING */
vl_IDAT_size[] = /* for png_set_IDAT_size */
{
{ "default", 0x7FFFFFFF },
{ "minimal", 1 },
RANGE(1, 0x7FFFFFFF)
},
#ifndef PNG_SW_IDAT_size
/* Pre 1.7 API: */
# define png_set_IDAT_size(p,v) png_set_compression_buffer_size(p, v)
#endif /* !SW_IDAT_size */
#define SL 8 /* stack limit in display, below */
vl_log_depth[] = { { "on", 1 }, { "off", 0 }, RANGE(0, SL) },
vl_on_off[] = { { "on", 1 }, { "off", 0 } };
#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
static value_list
vl_windowBits_IDAT[] =
{
{ "default", MAX_WBITS },
{ "small", 9 },
RANGE(8, MAX_WBITS), /* modified by set_windowBits_hi */
{ all, 0 }
};
#endif /* IDAT compression */
typedef struct option
{
const char *name; /* name of the option */
png_uint_32 opt; /* an option, or OPTION or LIST */
png_byte search; /* Search on --search */
png_byte value_count; /* length of the list of values: */
const value_list *values; /* values for OPTION or LIST */
} option;
static const option options[] =
{
/* struct display options, these are set when the command line is read */
# define S(n,v) { #n, v, 0, 2, vl_on_off },
S(verbose, VERBOSE)
S(warnings, WARNINGS)
S(errors, ERRORS)
S(quiet, QUIET)
S(strict, STRICT)
S(log, LOG)
S(continue, CONTINUE)
S(sizes, SIZES)
S(search, SEARCH)
S(nowrite, NOWRITE)
# ifdef IGNORE_INDEX
S(ignore-palette-index, IGNORE_INDEX)
# endif /* IGNORE_INDEX */
# ifdef FIX_INDEX
S(fix-palette-index, FIX_INDEX)
# endif /* FIX_INDEX */
# undef S
/* OPTION settings, these and LIST settings are read on demand */
# define VLNAME(name) vl_ ## name
# define VLSIZE(name) voidcast(png_byte,\
(sizeof VLNAME(name))/(sizeof VLNAME(name)[0]))
# define VL(oname, name, type, search)\
{ oname, type, search, VLSIZE(name), VLNAME(name) },
# define VLO(oname, name, search) VL(oname, name, OPTION, search)
# ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
# define VLCIDAT(name) VLO(#name, name, 1/*search*/)
# ifdef PNG_SW_COMPRESS_level
# define VLCiCCP(name) VLO("ICC-profile-" #name, name, 0/*search*/)
# else
# define VLCiCCP(name)
# endif
# else
# define VLCIDAT(name)
# define VLCiCCP(name)
# endif /* WRITE_CUSTOMIZE_COMPRESSION */
# ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
# define VLCzTXt(name) VLO("text-" #name, name, 0/*search*/)
# else
# define VLCzTXt(name)
# endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
# define VLC(name) VLCIDAT(name) VLCiCCP(name) VLCzTXt(name)
# ifdef PNG_SW_COMPRESS_png_level
/* The libpng compression level isn't searched because it justs sets the
* other things that are searched!
*/
VLO("compression", compression, 0)
VLO("text-compression", compression, 0)
VLO("ICC-profile-compression", compression, 0)
# endif /* SW_COMPRESS_png_level */
VLC(strategy)
VLO("windowBits", windowBits_IDAT, 1)
# ifdef PNG_SW_COMPRESS_windowBits
VLO("ICC-profile-windowBits", windowBits_text/*sic*/, 0)
# endif
VLO("text-windowBits", windowBits_text, 0)
VLC(level)
VLC(memLevel)
VLO("IDAT-size", IDAT_size, 0)
VLO("log-depth", log_depth, 0)
# undef VLO
/* LIST settings */
# define VLL(name, search) VL(#name, name, LIST, search)
#ifdef PNG_WRITE_FILTER_SUPPORTED
VLL(filter, 0)
#endif /* WRITE_FILTER */
#ifdef PNG_PNGCP_TIMING_SUPPORTED
VLL(time, 0)
#endif /* PNGCP_TIMING */
# undef VLL
# undef VL
};
#ifdef __cplusplus
static const size_t option_count((sizeof options)/(sizeof options[0]));
#else /* !__cplusplus */
# define option_count ((sizeof options)/(sizeof options[0]))
#endif /* !__cplusplus */
static const char *
cts(int ct)
{
switch (ct)
{
case PNG_COLOR_TYPE_PALETTE: return "P";
case PNG_COLOR_TYPE_GRAY: return "G";
case PNG_COLOR_TYPE_GRAY_ALPHA: return "GA";
case PNG_COLOR_TYPE_RGB: return "RGB";
case PNG_COLOR_TYPE_RGB_ALPHA: return "RGBA";
default: return "INVALID";
}
}
struct display
{
jmp_buf error_return; /* Where to go to on error */
unsigned int errset; /* error_return is set */
const char *operation; /* What is happening */
const char *filename; /* The name of the original file */
const char *output_file; /* The name of the output file */
/* Used on both read and write: */
FILE *fp;
/* Used on a read, both the original read and when validating a written
* image.
*/
png_alloc_size_t read_size;
png_structp read_pp;
png_infop ip;
# if PNG_LIBPNG_VER < 10700 && defined PNG_TEXT_SUPPORTED
png_textp text_ptr; /* stash of text chunks */
int num_text;
int text_stashed;
# endif /* pre 1.7 */
# ifdef PNG_PNGCP_TIMING_SUPPORTED
struct timespec read_time;
struct timespec read_time_total;
struct timespec write_time;
struct timespec write_time_total;
# endif /* PNGCP_TIMING */
/* Used to write a new image (the original info_ptr is used) */
# define MAX_SIZE ((png_alloc_size_t)(-1))
png_alloc_size_t write_size;
png_alloc_size_t best_size;
png_structp write_pp;
/* Base file information */
png_alloc_size_t size;
png_uint_32 w;
png_uint_32 h;
int bpp;
png_byte ct;
int no_warnings; /* Do not output libpng warnings */
int min_windowBits; /* The windowBits range is 8..8 */
/* Options handling */
png_uint_32 results; /* A mask of errors seen */
png_uint_32 options; /* See display_log below */
png_byte entry[option_count]; /* The selected entry+1 of an option
* that appears on the command line, or
* 0 if it was not given. */
int value[option_count]; /* Corresponding value */
/* Compression exhaustive testing */
/* Temporary variables used only while testing a single collection of
* settings:
*/
unsigned int csp; /* next stack entry to use */
unsigned int nsp; /* highest active entry+1 found so far */
/* Values used while iterating through all the combinations of settings for a
* single file:
*/
unsigned int tsp; /* nsp from the last run; this is the
* index+1 of the highest active entry on
* this run; this entry will be advanced.
*/
int opt_string_start; /* Position in buffer for the first
* searched option; non-zero if earlier
* options were set on the command line.
*/
struct stack
{
png_alloc_size_t best_size; /* Best so far for this option */
png_alloc_size_t lo_size;
png_alloc_size_t hi_size;
int lo, hi; /* For binary chop of a range */
int best_val; /* Best value found so far */
int opt_string_end; /* End of the option string in 'curr' */
png_byte opt; /* The option being tested */
png_byte entry; /* The next value entry to be tested */
png_byte end; /* This is the last entry */
} stack[SL]; /* Stack of entries being tested */
char curr[32*SL]; /* current options being tested */
char best[32*SL]; /* best options */
char namebuf[FILENAME_MAX]; /* output file name */
};
static void
display_init(struct display *dp)
/* Call this only once right at the start to initialize the control
* structure, the (struct buffer) lists are maintained across calls - the
* memory is not freed.
*/
{
memset(dp, 0, sizeof *dp);
dp->operation = "internal error";
dp->filename = "command line";
dp->output_file = "no output file";
dp->options = WARNINGS; /* default to !verbose, !quiet */
dp->fp = NULL;
dp->read_pp = NULL;
dp->ip = NULL;
dp->write_pp = NULL;
dp->min_windowBits = -1; /* this is an OPTIND, so -1 won't match anything */
# if PNG_LIBPNG_VER < 10700 && defined PNG_TEXT_SUPPORTED
dp->text_ptr = NULL;
dp->num_text = 0;
dp->text_stashed = 0;
# endif /* pre 1.7 */
}
static void
display_clean_read(struct display *dp)
{
if (dp->read_pp != NULL)
png_destroy_read_struct(&dp->read_pp, NULL, NULL);
if (dp->fp != NULL)
{
FILE *fp = dp->fp;
dp->fp = NULL;
(void)fclose(fp);
}
}
static void
display_clean_write(struct display *dp)
{
if (dp->fp != NULL)
{
FILE *fp = dp->fp;
dp->fp = NULL;
(void)fclose(fp);
}
if (dp->write_pp != NULL)
png_destroy_write_struct(&dp->write_pp, dp->tsp > 0 ? NULL : &dp->ip);
}
static void
display_clean(struct display *dp)
{
display_clean_read(dp);
display_clean_write(dp);
dp->output_file = NULL;
# if PNG_LIBPNG_VER < 10700 && defined PNG_TEXT_SUPPORTED
/* This is actually created and used by the write code, but only
* once; it has to be retained for subsequent writes of the same file.
*/
if (dp->text_stashed)
{
dp->text_stashed = 0;
dp->num_text = 0;
free(dp->text_ptr);
dp->text_ptr = NULL;
}
# endif /* pre 1.7 */
/* leave the filename for error detection */
dp->results = 0; /* reset for next time */
}
static void
display_destroy(struct display *dp)
{
/* Release any memory held in the display. */
display_clean(dp);
}
static struct display *
get_dp(png_structp pp)
/* The display pointer is always stored in the png_struct error pointer */
{
struct display *dp = (struct display*)png_get_error_ptr(pp);
if (dp == NULL)
{
fprintf(stderr, "pngcp: internal error (no display)\n");
exit(99); /* prevents a crash */
}
return dp;
}
/* error handling */
#ifdef __GNUC__
# define VGATTR __attribute__((__format__ (__printf__,3,4)))
/* Required to quiet GNUC warnings when the compiler sees a stdarg function
* that calls one of the stdio v APIs.
*/
#else
# define VGATTR
#endif
static void VGATTR
display_log(struct display *dp, error_level level, const char *fmt, ...)
/* 'level' is as above, fmt is a stdio style format string. This routine
* does not return if level is above LIBPNG_WARNING
*/
{
dp->results |= 1U << level;
if (level > (error_level)(dp->options & LEVEL_MASK))
{
const char *lp;
va_list ap;
switch (level)
{
case INFORMATION: lp = "information"; break;
case LIBPNG_WARNING: lp = "warning(libpng)"; break;
case APP_WARNING: lp = "warning(pngcp)"; break;
case APP_FAIL: lp = "error(continuable)"; break;
case LIBPNG_ERROR: lp = "error(libpng)"; break;
case LIBPNG_BUG: lp = "bug(libpng)"; break;
case APP_ERROR: lp = "error(pngcp)"; break;
case USER_ERROR: lp = "error(user)"; break;
case INTERNAL_ERROR: /* anything unexpected is an internal error: */
case VERBOSE: case WARNINGS: case ERRORS: case QUIET:
default: lp = "bug(pngcp)"; break;
}
fprintf(stderr, "%s: %s: %s",
dp->filename != NULL ? dp->filename : "<stdin>", lp, dp->operation);
fprintf(stderr, ": ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputc('\n', stderr);
}
/* else do not output any message */
/* Errors cause this routine to exit to the fail code */
if (level > APP_FAIL || (level > ERRORS && !(dp->options & CONTINUE)))
{
if (dp->errset)
longjmp(dp->error_return, level);
else
exit(99);
}
}
#if PNG_LIBPNG_VER < 10700 && defined PNG_TEXT_SUPPORTED
static void
text_stash(struct display *dp)
{
/* libpng 1.6 and earlier fixed a bug whereby text chunks were written
* multiple times by png_write_png; the issue was that png_write_png passed
* the same png_info to both png_write_info and png_write_end. Rather than
* fixing it by recording the information in the png_struct, or by recording
* where to write the chunks, the fix made was to change the 'compression'
* field of the chunk to invalid values, rendering the png_info somewhat
* useless.
*
* The only fix for this given that we use the png_info more than once is to
* make a copy of the text chunks and png_set_text it each time. This adds a
* text chunks, so they get replicated, but only the new set gets written
* each time. This uses memory like crazy but there is no way to delete the
* useless chunks from the png_info.
*
* To make this slightly more efficient only the top level structure is
* copied; since the old strings are actually preserved (in 1.6 and earlier)
* this happens to work.
*/
png_textp chunks = NULL;
dp->num_text = png_get_text(dp->write_pp, dp->ip, &chunks, NULL);
if (dp->num_text > 0)
{
dp->text_ptr = voidcast(png_textp, malloc(dp->num_text * sizeof *chunks));
if (dp->text_ptr == NULL)
display_log(dp, APP_ERROR, "text chunks: stash malloc failed");
else
memcpy(dp->text_ptr, chunks, dp->num_text * sizeof *chunks);
}
dp->text_stashed = 1; /* regardless of whether there are chunks or not */
}
#define text_stash(dp) if (!dp->text_stashed) text_stash(dp)
static void
text_restore(struct display *dp)
{
/* libpng makes a copy, so this is fine: */
if (dp->text_ptr != NULL)
png_set_text(dp->write_pp, dp->ip, dp->text_ptr, dp->num_text);
}
#define text_restore(dp) if (dp->text_stashed) text_restore(dp)
#else
#define text_stash(dp) ((void)0)
#define text_restore(dp) ((void)0)
#endif /* pre 1.7 */
/* OPTIONS:
*
* The command handles options of the forms:
*
* --option
* Turn an option on (Option)
* --no-option
* Turn an option off (Option)
* --option=value
* Set an option to a value (Value)
* --option=val1,val2,val3
* Set an option to a bitmask constructed from the values (List)
*/
static png_byte
option_index(struct display *dp, const char *opt, size_t len)
/* Return the index (in options[]) of the given option, outputs an error if
* it does not exist. Takes the name of the option and a length (number of
* characters in the name).
*/
{
png_byte j;
for (j=0; j<option_count; ++j)
if (strncmp(options[j].name, opt, len) == 0 && options[j].name[len] == 0)
return j;
/* If the setjmp buffer is set the code is asking for an option index; this
* is bad. Otherwise this is the command line option parsing.
*/
display_log(dp, dp->errset ? INTERNAL_ERROR : USER_ERROR,
"%.*s: unknown option", (int)/*SAFE*/len, opt);
abort(); /* NOT REACHED */
}
/* This works for an option name (no quotes): */
#define OPTIND(dp, name) option_index(dp, #name, (sizeof #name)-1)
static int
get_option(struct display *dp, const char *opt, int *value)
{
png_byte i = option_index(dp, opt, strlen(opt));
if (dp->entry[i]) /* option was set on command line */
{
*value = dp->value[i];
return 1;
}
else
return 0;
}
static int
set_opt_string_(struct display *dp, unsigned int sp, png_byte opt,
const char *entry_name)
/* Add the appropriate option string to dp->curr. */
{
int offset, add;
if (sp > 0)
offset = dp->stack[sp-1].opt_string_end;
else
offset = dp->opt_string_start;
if (entry_name == range_lo)
add = sprintf(dp->curr+offset, " --%s=%d", options[opt].name,
dp->value[opt]);
else
add = sprintf(dp->curr+offset, " --%s=%s", options[opt].name, entry_name);
if (add < 0)
display_log(dp, INTERNAL_ERROR, "sprintf failed");
assert(offset+add < (int)/*SAFE*/sizeof dp->curr);
return offset+add;
}
static void
set_opt_string(struct display *dp, unsigned int sp)
/* Add the appropriate option string to dp->curr. */
{
dp->stack[sp].opt_string_end = set_opt_string_(dp, sp, dp->stack[sp].opt,
options[dp->stack[sp].opt].values[dp->stack[sp].entry].name);
}
static void
record_opt(struct display *dp, png_byte opt, const char *entry_name)
/* Record this option in dp->curr; called for an option not being searched,
* the caller passes in the name of the value, or range_lo to use the
* numerical value.
*/
{
unsigned int sp = dp->csp; /* stack entry of next searched option */
if (sp >= dp->tsp)
{
/* At top of stack; add the opt string for this entry to the previous
* searched entry or the start of the dp->curr buffer if there is nothing
* on the stack yet (sp == 0).
*/
int offset = set_opt_string_(dp, sp, opt, entry_name);
if (sp > 0)
dp->stack[sp-1].opt_string_end = offset;
else
dp->opt_string_start = offset;
}
/* else do nothing: option already recorded */
}
static int
opt_list_end(struct display *dp, png_byte opt, png_byte entry)
{
if (options[opt].values[entry].name == range_lo)
return entry+1U >= options[opt].value_count /* missing range_hi */ ||
options[opt].values[entry+1U].name != range_hi /* likewise */ ||
options[opt].values[entry+1U].value <= dp->value[opt] /* range end */;
else
return entry+1U >= options[opt].value_count /* missing 'all' */ ||
options[opt].values[entry+1U].name == all /* last entry */;
}
static void
push_opt(struct display *dp, unsigned int sp, png_byte opt, int search)
/* Push a new option onto the stack, initializing the new stack entry
* appropriately; this does all the work of next_opt (setting end/nsp) for
* the first entry in the list.
*/
{
png_byte entry;
const char *entry_name;
assert(sp == dp->tsp && sp < SL);
/* The starting entry is entry 0 unless there is a range in which case it is
* the entry corresponding to range_lo:
*/
entry = options[opt].value_count;
assert(entry > 0U);
do
{
entry_name = options[opt].values[--entry].name;
if (entry_name == range_lo)
break;
}
while (entry > 0U);
dp->tsp = sp+1U;
dp->stack[sp].best_size =
dp->stack[sp].lo_size =
dp->stack[sp].hi_size = MAX_SIZE;
if (search && entry_name == range_lo) /* search this range */
{
dp->stack[sp].lo = options[opt].values[entry].value;
/* check for a mal-formed RANGE above: */
assert(entry+1 < options[opt].value_count &&
options[opt].values[entry+1].name == range_hi);
dp->stack[sp].hi = options[opt].values[entry+1].value;
}
else
{
/* next_opt will just iterate over the range. */
dp->stack[sp].lo = INT_MAX;
dp->stack[sp].hi = INT_MIN; /* Prevent range chop */
}
dp->stack[sp].opt = opt;
dp->stack[sp].entry = entry;
dp->stack[sp].best_val = dp->value[opt] = options[opt].values[entry].value;
set_opt_string(dp, sp);
/* This works for the search case too; if the range has only one entry 'end'
* will be marked here.
*/
if (opt_list_end(dp, opt, entry))
{
dp->stack[sp].end = 1;
/* Skip the warning if pngcp did this itself. See the code in
* set_windowBits_hi.
*/
if (opt != dp->min_windowBits)
display_log(dp, APP_WARNING, "%s: only testing one value",
options[opt].name);
}
else
{
dp->stack[sp].end = 0;
dp->nsp = dp->tsp;
}
/* Do a lazy cache of the text chunks for libpng 1.6 and earlier; this is
* because they can only be written once(!) so if we are going to re-use the
* png_info we need a copy.
*/
text_stash(dp);
}
static void
next_opt(struct display *dp, unsigned int sp)
/* Return the next value for this option. When called 'sp' is expected to be
* the topmost stack entry - only the topmost entry changes each time round -
* and there must be a valid entry to return. next_opt will set dp->nsp to
* sp+1 if more entries are available, otherwise it will not change it and
* set dp->stack[s].end to true.
*/
{
int search = 0;
png_byte entry, opt;
const char *entry_name;
/* dp->stack[sp] must be the top stack entry and it must be active: */
assert(sp+1U == dp->tsp && !dp->stack[sp].end);
opt = dp->stack[sp].opt;
entry = dp->stack[sp].entry;
assert(entry+1U < options[opt].value_count);
entry_name = options[opt].values[entry].name;
assert(entry_name != NULL);
/* For ranges increment the value but don't change the entry, for all other
* cases move to the next entry and load its value:
*/
if (entry_name == range_lo) /* a range */
{
/* A range can be iterated over or searched. The default iteration option
* is indicated by hi < lo on the stack, otherwise the range being search
* is [lo..hi] (inclusive).
*/
if (dp->stack[sp].lo > dp->stack[sp].hi)
dp->value[opt]++;
else
{
/* This is the best size found for this option value: */
png_alloc_size_t best_size = dp->stack[sp].best_size;
int lo = dp->stack[sp].lo;
int hi = dp->stack[sp].hi;
int val = dp->value[opt];
search = 1; /* end is determined here */
assert(best_size < MAX_SIZE);
if (val == lo)
{
/* Finding the best for the low end of the range: */
dp->stack[sp].lo_size = best_size;
assert(hi > val);
if (hi == val+1) /* only 2 entries */
dp->stack[sp].end = 1;
val = hi;
}
else if (val == hi)
{
dp->stack[sp].hi_size = best_size;
assert(val > lo+1); /* else 'end' set above */
if (val == lo+2) /* only three entries to test */
dp->stack[sp].end = 1;
val = (lo + val)/2;
}
else
{
png_alloc_size_t lo_size = dp->stack[sp].lo_size;
png_alloc_size_t hi_size = dp->stack[sp].hi_size;
/* lo and hi should have been tested. */
assert(lo_size < MAX_SIZE && hi_size < MAX_SIZE);
/* These cases arise with the 'probe' handling below when there is a
* dip or peak in the size curve.
*/
if (val < lo) /* probing a new lo */
{
/* Swap lo and val: */
dp->stack[sp].lo = val;
dp->stack[sp].lo_size = best_size;
val = lo;
best_size = lo_size;
lo = dp->stack[sp].lo;
lo_size = dp->stack[sp].lo_size;
}
else if (val > hi) /* probing a new hi */
{
/* Swap hi and val: */
dp->stack[sp].hi = val;
dp->stack[sp].hi_size = best_size;
val = hi;