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libpng/contrib/libtests/pngimage.c
John Bowler d7d950e8bd [libpng16] chore: Clean up the leading blank lines from all source files 
The leading blank lines are apparently an artefact of an older source
control system.  They are not required and they look like accidents,
because starting a source file with a blank line is not a regular habit
of software developers nowadays.

This is a cherry-pick of commit 37cc20add8fb5b83bb5299a26cd3b41e0f776017
from branch 'libpng18'.

Signed-off-by: John Bowler <jbowler@acm.org>
Signed-off-by: Cosmin Truta <ctruta@gmail.com>
2024-10-11 11:51:04 +03:00

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/* pngimage.c
*
* Copyright (c) 2021 Cosmin Truta
* Copyright (c) 2015,2016 John Cunningham Bowler
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Test the png_read_png and png_write_png interfaces. Given a PNG file load it
* using png_read_png and then write with png_write_png. Test all possible
* transforms.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <assert.h>
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
# include <config.h>
#endif
/* 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
#ifndef PNG_SETJMP_SUPPORTED
# include <setjmp.h> /* because png.h did *not* include this */
#endif
/* 1.6.1 added support for the configure test harness, which uses 77 to indicate
* a skipped test, in earlier versions we need to succeed on a skipped test, so:
*/
#if PNG_LIBPNG_VER >= 10601 && defined(HAVE_CONFIG_H)
# define SKIP 77
#else
# define SKIP 0
#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 */
#ifdef PNG_READ_PNG_SUPPORTED
/* If a transform is valid on both read and write this implies that if the
* transform is applied to read it must also be applied on write to produce
* meaningful data. This is because these transforms when performed on read
* produce data with a memory format that does not correspond to a PNG format.
*
* Most of these transforms are invertible; after applying the transform on
* write the result is the original PNG data that would have would have been
* read if no transform were applied.
*
* The exception is _SHIFT, which destroys the low order bits marked as not
* significant in a PNG with the sBIT chunk.
*
* The following table lists, for each transform, the conditions under which it
* is expected to do anything. Conditions are defined as follows:
*
* 1) Color mask bits required - simply a mask to AND with color_type; one of
* these must be present for the transform to fire, except that 0 means
* 'always'.
* 2) Color mask bits which must be absent - another mask - none of these must
* be present.
* 3) Bit depths - a mask of component bit depths for the transform to fire.
* 4) 'read' - the transform works in png_read_png.
* 5) 'write' - the transform works in png_write_png.
* 6) PNG_INFO_chunk; a mask of the chunks that must be present for the
* transform to fire. All must be present - the requirement is that
* png_get_valid() & mask == mask, so if mask is 0 there is no requirement.
*
* The condition refers to the original image state - if multiple transforms are
* used together it is possible to cause a transform that wouldn't fire on the
* original image to fire.
*/
static struct transform_info
{
const char *name;
int transform;
png_uint_32 valid_chunks;
# define CHUNK_NONE 0
# define CHUNK_sBIT PNG_INFO_sBIT
# define CHUNK_tRNS PNG_INFO_tRNS
png_byte color_mask_required;
png_byte color_mask_absent;
# define COLOR_MASK_X 0
# define COLOR_MASK_P PNG_COLOR_MASK_PALETTE
# define COLOR_MASK_C PNG_COLOR_MASK_COLOR
# define COLOR_MASK_A PNG_COLOR_MASK_ALPHA
# define COLOR_MASK_ALL (PALETTE+COLOR+ALPHA) /* absent = gray, no alpha */
png_byte bit_depths;
# define BD_ALL (1 + 2 + 4 + 8 + 16)
# define BD_PAL (1 + 2 + 4 + 8)
# define BD_LOW (1 + 2 + 4)
# define BD_16 16
# define BD_TRUE (8+16) /* i.e. true-color depths */
png_byte when;
# define TRANSFORM_R 1
# define TRANSFORM_W 2
# define TRANSFORM_RW 3
png_byte tested; /* the transform was tested somewhere */
} transform_info[] =
{
/* List ALL the PNG_TRANSFORM_ macros here. Check for support using the READ
* macros; even if the transform is supported on write it cannot be tested
* without the read support.
*/
# define T(name,chunk,cm_required,cm_absent,bd,when)\
{ #name, PNG_TRANSFORM_ ## name, CHUNK_ ## chunk,\
COLOR_MASK_ ## cm_required, COLOR_MASK_ ## cm_absent, BD_ ## bd,\
TRANSFORM_ ## when, 0/*!tested*/ }
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
T(STRIP_16, NONE, X, X, 16, R),
/* drops the bottom 8 bits when bit depth is 16 */
#endif
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
T(STRIP_ALPHA, NONE, A, X, ALL, R),
/* removes the alpha channel if present */
#endif
#ifdef PNG_WRITE_PACK_SUPPORTED
# define TRANSFORM_RW_PACK TRANSFORM_RW
#else
# define TRANSFORM_RW_PACK TRANSFORM_R
#endif
#ifdef PNG_READ_PACK_SUPPORTED
T(PACKING, NONE, X, X, LOW, RW_PACK),
/* unpacks low-bit-depth components into 1 byte per component on read,
* reverses this on write.
*/
#endif
#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
# define TRANSFORM_RW_PACKSWAP TRANSFORM_RW
#else
# define TRANSFORM_RW_PACKSWAP TRANSFORM_R
#endif
#ifdef PNG_READ_PACKSWAP_SUPPORTED
T(PACKSWAP, NONE, X, X, LOW, RW_PACKSWAP),
/* reverses the order of low-bit-depth components packed into a byte */
#endif
#ifdef PNG_READ_EXPAND_SUPPORTED
T(EXPAND, NONE, P, X, ALL, R),
/* expands PLTE PNG files to RGB (no tRNS) or RGBA (tRNS) *
* Note that the 'EXPAND' transform does lots of different things: */
T(EXPAND, NONE, X, C, ALL, R),
/* expands grayscale PNG files to RGB, or RGBA */
T(EXPAND, tRNS, X, A, ALL, R),
/* expands the tRNS chunk in files without alpha */
#endif
#ifdef PNG_WRITE_INVERT_SUPPORTED
# define TRANSFORM_RW_INVERT TRANSFORM_RW
#else
# define TRANSFORM_RW_INVERT TRANSFORM_R
#endif
#ifdef PNG_READ_INVERT_SUPPORTED
T(INVERT_MONO, NONE, X, C, ALL, RW_INVERT),
/* converts gray-scale components to 1..0 from 0..1 */
#endif
#ifdef PNG_WRITE_SHIFT_SUPPORTED
# define TRANSFORM_RW_SHIFT TRANSFORM_RW
#else
# define TRANSFORM_RW_SHIFT TRANSFORM_R
#endif
#ifdef PNG_READ_SHIFT_SUPPORTED
T(SHIFT, sBIT, X, X, ALL, RW_SHIFT),
/* reduces component values to the original range based on the sBIT chunk,
* this is only partially reversible - the low bits are lost and cannot be
* recovered on write. In fact write code replicates the bits to generate
* new low-order bits.
*/
#endif
#ifdef PNG_WRITE_BGR_SUPPORTED
# define TRANSFORM_RW_BGR TRANSFORM_RW
#else
# define TRANSFORM_RW_BGR TRANSFORM_R
#endif
#ifdef PNG_READ_BGR_SUPPORTED
T(BGR, NONE, C, P, TRUE, RW_BGR),
/* reverses the rgb component values of true-color pixels */
#endif
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
# define TRANSFORM_RW_SWAP_ALPHA TRANSFORM_RW
#else
# define TRANSFORM_RW_SWAP_ALPHA TRANSFORM_R
#endif
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
T(SWAP_ALPHA, NONE, A, X, TRUE, RW_SWAP_ALPHA),
/* swaps the alpha channel of RGBA or GA pixels to the front - ARGB or
* AG, on write reverses the process.
*/
#endif
#ifdef PNG_WRITE_SWAP_SUPPORTED
# define TRANSFORM_RW_SWAP TRANSFORM_RW
#else
# define TRANSFORM_RW_SWAP TRANSFORM_R
#endif
#ifdef PNG_READ_SWAP_SUPPORTED
T(SWAP_ENDIAN, NONE, X, P, 16, RW_SWAP),
/* byte-swaps 16-bit component values */
#endif
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
# define TRANSFORM_RW_INVERT_ALPHA TRANSFORM_RW
#else
# define TRANSFORM_RW_INVERT_ALPHA TRANSFORM_R
#endif
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
T(INVERT_ALPHA, NONE, A, X, TRUE, RW_INVERT_ALPHA),
/* converts an alpha channel from 0..1 to 1..0 */
#endif
#ifdef PNG_WRITE_FILLER_SUPPORTED
T(STRIP_FILLER_BEFORE, NONE, A, P, TRUE, W), /* 'A' for a filler! */
/* on write skips a leading filler channel; testing requires data with a
* filler channel so this is produced from RGBA or GA images by removing
* the 'alpha' flag from the color type in place.
*/
T(STRIP_FILLER_AFTER, NONE, A, P, TRUE, W),
/* on write strips a trailing filler channel */
#endif
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
T(GRAY_TO_RGB, NONE, X, C, ALL, R),
/* expands grayscale images to RGB, also causes the palette part of
* 'EXPAND' to happen. Low bit depth grayscale images are expanded to
* 8-bits per component and no attempt is made to convert the image to a
* palette image. While this transform is partially reversible
* png_write_png does not currently support this.
*/
T(GRAY_TO_RGB, NONE, P, X, ALL, R),
/* The 'palette' side effect mentioned above; a bit bogus but this is the
* way the libpng code works.
*/
#endif
#ifdef PNG_READ_EXPAND_16_SUPPORTED
T(EXPAND_16, NONE, X, X, PAL, R),
/* expands images to 16-bits per component, as a side effect expands
* palette images to RGB and expands the tRNS chunk if present, so it can
* modify 16-bit per component images as well:
*/
T(EXPAND_16, tRNS, X, A, 16, R),
/* side effect of EXPAND_16 - expands the tRNS chunk in an RGB or G 16-bit
* image.
*/
#endif
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
T(SCALE_16, NONE, X, X, 16, R),
/* scales 16-bit components to 8-bits. */
#endif
{ NULL /*name*/, 0, 0, 0, 0, 0, 0, 0/*!tested*/ }
#undef T
};
#define ARRAY_SIZE(a) ((sizeof a)/(sizeof a[0]))
#define TTABLE_SIZE ARRAY_SIZE(transform_info)
/* Some combinations of options that should be reversible are not; these cases
* are bugs.
*/
static int known_bad_combos[][2] =
{
/* problem, antidote */
{ PNG_TRANSFORM_SHIFT | PNG_TRANSFORM_INVERT_ALPHA, 0/*antidote*/ }
};
static int
is_combo(int transforms)
{
return transforms & (transforms-1); /* non-zero if more than one set bit */
}
static int
first_transform(int transforms)
{
return transforms & -transforms; /* lowest set bit */
}
static int
is_bad_combo(int transforms)
{
unsigned int i;
for (i=0; i<ARRAY_SIZE(known_bad_combos); ++i)
{
int combo = known_bad_combos[i][0];
if ((combo & transforms) == combo &&
(transforms & known_bad_combos[i][1]) == 0)
return 1;
}
return 0; /* combo is ok */
}
static const char *
transform_name(int t)
/* The name, if 't' has multiple bits set the name of the lowest set bit is
* returned.
*/
{
unsigned int i;
t &= -t; /* first set bit */
for (i=0; i<TTABLE_SIZE; ++i)
if (transform_info[i].name != NULL)
if ((transform_info[i].transform & t) != 0)
return transform_info[i].name;
return "invalid transform";
}
/* Variables calculated by validate_T below and used to record all the supported
* transforms. Need (unsigned int) here because of the places where these
* values are used (unsigned compares in the 'exhaustive' iterator.)
*/
static unsigned int read_transforms, write_transforms, rw_transforms;
static void
validate_T(void)
/* Validate the above table - this just builds the above values */
{
unsigned int i;
for (i=0; i<TTABLE_SIZE; ++i)
{
if (transform_info[i].name != NULL)
{
if (transform_info[i].when & TRANSFORM_R)
read_transforms |= transform_info[i].transform;
if (transform_info[i].when & TRANSFORM_W)
write_transforms |= transform_info[i].transform;
}
}
/* Reversible transforms are those which are supported on both read and
* write.
*/
rw_transforms = read_transforms & write_transforms;
}
/* FILE DATA HANDLING
* The original file is cached in memory. During write the output file is
* written to memory.
*
* In both cases the file data is held in a linked list of buffers - not all
* of these are in use at any time.
*/
#define NEW(type) ((type *)malloc(sizeof (type)))
#define DELETE(ptr) (free(ptr))
struct buffer_list
{
struct buffer_list *next; /* next buffer in list */
png_byte buffer[1024]; /* the actual buffer */
};
struct buffer
{
struct buffer_list *last; /* last buffer in use */
size_t end_count; /* bytes in the last buffer */
struct buffer_list *current; /* current buffer being read */
size_t read_count; /* count of bytes read from current */
struct buffer_list first; /* the very first buffer */
};
static void
buffer_init(struct buffer *buffer)
/* Call this only once for a given buffer */
{
buffer->first.next = NULL;
buffer->last = NULL;
buffer->current = NULL;
}
static void
buffer_destroy_list(struct buffer_list *list)
{
if (list != NULL)
{
struct buffer_list *next = list->next;
DELETE(list);
buffer_destroy_list(next);
}
}
static void
buffer_destroy(struct buffer *buffer)
{
struct buffer_list *list = buffer->first.next;
buffer_init(buffer);
buffer_destroy_list(list);
}
#ifdef PNG_WRITE_PNG_SUPPORTED
static void
buffer_start_write(struct buffer *buffer)
{
buffer->last = &buffer->first;
buffer->end_count = 0;
buffer->current = NULL;
}
#endif
static void
buffer_start_read(struct buffer *buffer)
{
buffer->current = &buffer->first;
buffer->read_count = 0;
}
#ifdef ENOMEM /* required by POSIX 1003.1 */
# define MEMORY ENOMEM
#else
# define MEMORY ERANGE /* required by ANSI-C */
#endif
static struct buffer *
get_buffer(png_structp pp)
/* Used from libpng callbacks to get the current buffer */
{
return (struct buffer*)png_get_io_ptr(pp);
}
static struct buffer_list *
buffer_extend(struct buffer_list *current)
{
struct buffer_list *add;
assert(current->next == NULL);
add = NEW(struct buffer_list);
if (add == NULL)
return NULL;
add->next = NULL;
current->next = add;
return add;
}
/* Load a buffer from a file; does the equivalent of buffer_start_write. On a
* read error returns an errno value, else returns 0.
*/
static int
buffer_from_file(struct buffer *buffer, FILE *fp)
{
struct buffer_list *last = &buffer->first;
size_t count = 0;
for (;;)
{
size_t r = fread(last->buffer+count, 1/*size*/,
(sizeof last->buffer)-count, fp);
if (r > 0)
{
count += r;
if (count >= sizeof last->buffer)
{
assert(count == sizeof last->buffer);
count = 0;
if (last->next == NULL)
{
last = buffer_extend(last);
if (last == NULL)
return MEMORY;
}
else
last = last->next;
}
}
else /* fread failed - probably end of file */
{
if (feof(fp))
{
buffer->last = last;
buffer->end_count = count;
return 0; /* no error */
}
/* Some kind of funky error; errno should be non-zero */
return errno == 0 ? ERANGE : errno;
}
}
}
/* 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 EXHAUSTIVE 0x010 /* Test all combinations of active options */
#define STRICT 0x020 /* Fail on warnings as well as errors */
#define LOG 0x040 /* Log pass/fail to stdout */
#define CONTINUE 0x080 /* Continue on APP_FAIL errors */
#define SKIP_BUGS 0x100 /* Skip over known bugs */
#define LOG_SKIPPED 0x200 /* Log skipped bugs */
#define FIND_BAD_COMBOS 0x400 /* Attempt to deduce bad combos */
#define LIST_COMBOS 0x800 /* List combos by name */
/* 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)
struct display
{
jmp_buf error_return; /* Where to go to on error */
const char *filename; /* The name of the original file */
const char *operation; /* Operation being performed */
int transforms; /* Transform used in operation */
png_uint_32 options; /* See display_log below */
png_uint_32 results; /* A mask of errors seen */
png_structp original_pp; /* used on the original read */
png_infop original_ip; /* set by the original read */
size_t original_rowbytes; /* of the original rows: */
png_bytepp original_rows; /* from the original read */
/* Original chunks valid */
png_uint_32 chunks;
/* Original IHDR information */
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
int interlace_method;
int compression_method;
int filter_method;
/* Derived information for the original image. */
int active_transforms; /* transforms that do something on read */
int ignored_transforms; /* transforms that should do nothing */
/* Used on a read, both the original read and when validating a written
* image.
*/
png_structp read_pp;
png_infop read_ip;
# ifdef PNG_WRITE_PNG_SUPPORTED
/* Used to write a new image (the original info_ptr is used) */
png_structp write_pp;
struct buffer written_file; /* where the file gets written */
# endif
struct buffer original_file; /* Data read from the original file */
};
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->options = WARNINGS; /* default to !verbose, !quiet */
dp->filename = NULL;
dp->operation = NULL;
dp->original_pp = NULL;
dp->original_ip = NULL;
dp->original_rows = NULL;
dp->read_pp = NULL;
dp->read_ip = NULL;
buffer_init(&dp->original_file);
# ifdef PNG_WRITE_PNG_SUPPORTED
dp->write_pp = NULL;
buffer_init(&dp->written_file);
# endif
}
static void
display_clean_read(struct display *dp)
{
if (dp->read_pp != NULL)
png_destroy_read_struct(&dp->read_pp, &dp->read_ip, NULL);
}
#ifdef PNG_WRITE_PNG_SUPPORTED
static void
display_clean_write(struct display *dp)
{
if (dp->write_pp != NULL)
png_destroy_write_struct(&dp->write_pp, NULL);
}
#endif
static void
display_clean(struct display *dp)
{
# ifdef PNG_WRITE_PNG_SUPPORTED
display_clean_write(dp);
# endif
display_clean_read(dp);
dp->original_rowbytes = 0;
dp->original_rows = NULL;
dp->chunks = 0;
png_destroy_read_struct(&dp->original_pp, &dp->original_ip, NULL);
/* 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. */
# ifdef PNG_WRITE_PNG_SUPPORTED
buffer_destroy(&dp->written_file);
# endif
buffer_destroy(&dp->original_file);
}
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, "pngimage: 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(pngimage)"; 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(pngimage)"; 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(pngimage)"; break;
}
fprintf(stderr, "%s: %s: %s",
dp->filename != NULL ? dp->filename : "<stdin>", lp, dp->operation);
if (dp->transforms != 0)
{
int tr = dp->transforms;
if (is_combo(tr))
{
if (dp->options & LIST_COMBOS)
{
int trx = tr;
fprintf(stderr, "(");
if (trx)
{
int start = 0;
while (trx)
{
int trz = trx & -trx;
if (start) fprintf(stderr, "+");
fprintf(stderr, "%s", transform_name(trz));
start = 1;
trx &= ~trz;
}
}
else
fprintf(stderr, "-");
fprintf(stderr, ")");
}
else
fprintf(stderr, "(0x%x)", tr);
}
else
fprintf(stderr, "(%s)", transform_name(tr));
}
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)))
longjmp(dp->error_return, level);
}
/* error handler callbacks for libpng */
static void PNGCBAPI
display_warning(png_structp pp, png_const_charp warning)
{
display_log(get_dp(pp), LIBPNG_WARNING, "%s", warning);
}
static void PNGCBAPI
display_error(png_structp pp, png_const_charp error)
{
struct display *dp = get_dp(pp);
display_log(dp, LIBPNG_ERROR, "%s", error);
}
static void
display_cache_file(struct display *dp, const char *filename)
/* Does the initial cache of the file. */
{
FILE *fp;
int ret;
dp->filename = filename;
if (filename != NULL)
{
fp = fopen(filename, "rb");
if (fp == NULL)
display_log(dp, USER_ERROR, "open failed: %s", strerror(errno));
}
else
fp = stdin;
ret = buffer_from_file(&dp->original_file, fp);
fclose(fp);
if (ret != 0)
display_log(dp, APP_ERROR, "read failed: %s", strerror(ret));
}
static void
buffer_read(struct display *dp, struct buffer *bp, png_bytep data,
size_t size)
{
struct buffer_list *last = bp->current;
size_t read_count = bp->read_count;
while (size > 0)
{
size_t avail;
if (last == NULL ||
(last == bp->last && read_count >= bp->end_count))
{
display_log(dp, USER_ERROR, "file truncated (%lu bytes)",
(unsigned long)size);
/*NOTREACHED*/
break;
}
else if (read_count >= sizeof last->buffer)
{
/* Move to the next buffer: */
last = last->next;
read_count = 0;
bp->current = last; /* Avoid update outside the loop */
/* And do a sanity check (the EOF case is caught above) */
if (last == NULL)
{
display_log(dp, INTERNAL_ERROR, "damaged buffer list");
/*NOTREACHED*/
break;
}
}
avail = (sizeof last->buffer) - read_count;
if (avail > size)
avail = size;
memcpy(data, last->buffer + read_count, avail);
read_count += avail;
size -= avail;
data += avail;
}
bp->read_count = read_count;
}
static void PNGCBAPI
read_function(png_structp pp, png_bytep data, size_t size)
{
buffer_read(get_dp(pp), get_buffer(pp), data, size);
}
static void
read_png(struct display *dp, struct buffer *bp, const char *operation,
int transforms)
{
png_structp pp;
png_infop ip;
/* This cleans out any previous read and sets operation and transforms to
* empty.
*/
display_clean_read(dp);
if (operation != NULL) /* else this is a verify and do not overwrite info */
{
dp->operation = operation;
dp->transforms = transforms;
}
dp->read_pp = pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, dp,
display_error, display_warning);
if (pp == NULL)
display_log(dp, LIBPNG_ERROR, "failed to create read struct");
/* The png_read_png API requires us to make the info struct, but it does the
* call to png_read_info.
*/
dp->read_ip = ip = png_create_info_struct(pp);
if (ip == NULL)
display_log(dp, LIBPNG_ERROR, "failed to create info struct");
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* Remove the user limits, if any */
png_set_user_limits(pp, 0x7fffffff, 0x7fffffff);
# endif
/* Set the IO handling */
buffer_start_read(bp);
png_set_read_fn(pp, bp, read_function);
png_read_png(pp, ip, transforms, NULL/*params*/);
#if 0 /* crazy debugging */
{
png_bytep pr = png_get_rows(pp, ip)[0];
size_t rb = png_get_rowbytes(pp, ip);
size_t cb;
char c = ' ';
fprintf(stderr, "%.4x %2d (%3lu bytes):", transforms, png_get_bit_depth(pp,ip), (unsigned long)rb);
for (cb=0; cb<rb; ++cb)
fputc(c, stderr), fprintf(stderr, "%.2x", pr[cb]), c='.';
fputc('\n', stderr);
}
#endif
}
static void
update_display(struct display *dp)
/* called once after the first read to update all the info, original_pp and
* original_ip must have been filled in.
*/
{
png_structp pp;
png_infop ip;
/* Now perform the initial read with a 0 transform. */
read_png(dp, &dp->original_file, "original read", 0/*no transform*/);
/* Move the result to the 'original' fields */
dp->original_pp = pp = dp->read_pp, dp->read_pp = NULL;
dp->original_ip = ip = dp->read_ip, dp->read_ip = NULL;
dp->original_rowbytes = png_get_rowbytes(pp, ip);
if (dp->original_rowbytes == 0)
display_log(dp, LIBPNG_BUG, "png_get_rowbytes returned 0");
dp->chunks = png_get_valid(pp, ip, 0xffffffff);
if ((dp->chunks & PNG_INFO_IDAT) == 0) /* set by png_read_png */
display_log(dp, LIBPNG_BUG, "png_read_png did not set IDAT flag");
dp->original_rows = png_get_rows(pp, ip);
if (dp->original_rows == NULL)
display_log(dp, LIBPNG_BUG, "png_read_png did not create row buffers");
if (!png_get_IHDR(pp, ip,
&dp->width, &dp->height, &dp->bit_depth, &dp->color_type,
&dp->interlace_method, &dp->compression_method, &dp->filter_method))
display_log(dp, LIBPNG_BUG, "png_get_IHDR failed");
/* 'active' transforms are discovered based on the original image format;
* running one active transform can activate others. At present the code
* does not attempt to determine the closure.
*/
{
png_uint_32 chunks = dp->chunks;
int active = 0, inactive = 0;
int ct = dp->color_type;
int bd = dp->bit_depth;
unsigned int i;
for (i=0; i<TTABLE_SIZE; ++i)
{
if (transform_info[i].name != NULL)
{
int transform = transform_info[i].transform;
if ((transform_info[i].valid_chunks == 0 ||
(transform_info[i].valid_chunks & chunks) != 0) &&
(transform_info[i].color_mask_required & ct) ==
transform_info[i].color_mask_required &&
(transform_info[i].color_mask_absent & ct) == 0 &&
(transform_info[i].bit_depths & bd) != 0 &&
(transform_info[i].when & TRANSFORM_R) != 0)
active |= transform;
else if ((transform_info[i].when & TRANSFORM_R) != 0)
inactive |= transform;
}
}
/* Some transforms appear multiple times in the table; the 'active' status
* is the logical OR of these and the inactive status must be adjusted to
* take this into account.
*/
inactive &= ~active;
dp->active_transforms = active;
dp->ignored_transforms = inactive; /* excluding write-only transforms */
}
}
static int
compare_read(struct display *dp, int applied_transforms)
{
/* Compare the png_info from read_ip with original_info */
size_t rowbytes;
png_uint_32 width, height;
int bit_depth, color_type;
int interlace_method, compression_method, filter_method;
const char *e = NULL;
if (!png_get_IHDR(dp->read_pp, dp->read_ip, &width, &height, &bit_depth,
&color_type, &interlace_method, &compression_method, &filter_method))
display_log(dp, LIBPNG_BUG, "png_get_IHDR failed");
# define C(item) if (item != dp->item) \
display_log(dp, APP_WARNING, "IHDR " #item "(%lu) changed to %lu",\
(unsigned long)dp->item, (unsigned long)item), e = #item
/* The IHDR should be identical: */
C(width);
C(height);
C(bit_depth);
C(color_type);
C(interlace_method);
C(compression_method);
C(filter_method);
/* 'e' remains set to the name of the last thing changed: */
if (e)
display_log(dp, APP_ERROR, "IHDR changed (%s)", e);
/* All the chunks from the original PNG should be preserved in the output PNG
* because the PNG format has not been changed.
*/
{
unsigned long chunks =
png_get_valid(dp->read_pp, dp->read_ip, 0xffffffff);
if (chunks != dp->chunks)
display_log(dp, APP_FAIL, "PNG chunks changed from 0x%lx to 0x%lx",
(unsigned long)dp->chunks, chunks);
}
/* rowbytes should be the same */
rowbytes = png_get_rowbytes(dp->read_pp, dp->read_ip);
/* NOTE: on 64-bit systems this may trash the top bits of rowbytes,
* which could lead to weird error messages.
*/
if (rowbytes != dp->original_rowbytes)
display_log(dp, APP_ERROR, "PNG rowbytes changed from %lu to %lu",
(unsigned long)dp->original_rowbytes, (unsigned long)rowbytes);
/* The rows should be the same too, unless the applied transforms includes
* the shift transform, in which case low bits may have been lost.
*/
{
png_bytepp rows = png_get_rows(dp->read_pp, dp->read_ip);
unsigned int mask; /* mask (if not zero) for the final byte */
if (bit_depth < 8)
{
/* Need the stray bits at the end, this depends only on the low bits
* of the image width; overflow does not matter. If the width is an
* exact multiple of 8 bits this gives a mask of 0, not 0xff.
*/
mask = 0xff & (0xff00 >> ((bit_depth * width) & 7));
}
else
mask = 0;
if (rows == NULL)
display_log(dp, LIBPNG_BUG, "png_get_rows returned NULL");
if ((applied_transforms & PNG_TRANSFORM_SHIFT) == 0 ||
(dp->active_transforms & PNG_TRANSFORM_SHIFT) == 0 ||
color_type == PNG_COLOR_TYPE_PALETTE)
{
unsigned long y;
for (y=0; y<height; ++y)
{
png_bytep row = rows[y];
png_bytep orig = dp->original_rows[y];
if (memcmp(row, orig, rowbytes-(mask != 0)) != 0 || (mask != 0 &&
((row[rowbytes-1] & mask) != (orig[rowbytes-1] & mask))))
{
size_t x;
/* Find the first error */
for (x=0; x<rowbytes-1; ++x)
if (row[x] != orig[x])
break;
display_log(dp, APP_FAIL,
"byte(%lu,%lu) changed 0x%.2x -> 0x%.2x",
(unsigned long)x, (unsigned long)y, orig[x], row[x]);
return 0; /* don't keep reporting failed rows on 'continue' */
}
}
}
else
# ifdef PNG_sBIT_SUPPORTED
{
unsigned long y;
int bpp; /* bits-per-pixel then bytes-per-pixel */
/* components are up to 8 bytes in size */
png_byte sig_bits[8];
png_color_8p sBIT;
if (png_get_sBIT(dp->read_pp, dp->read_ip, &sBIT) != PNG_INFO_sBIT)
display_log(dp, INTERNAL_ERROR,
"active shift transform but no sBIT in file");
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY:
sig_bits[0] = sBIT->gray;
bpp = bit_depth;
break;
case PNG_COLOR_TYPE_GA:
sig_bits[0] = sBIT->gray;
sig_bits[1] = sBIT->alpha;
bpp = 2 * bit_depth;
break;
case PNG_COLOR_TYPE_RGB:
sig_bits[0] = sBIT->red;
sig_bits[1] = sBIT->green;
sig_bits[2] = sBIT->blue;
bpp = 3 * bit_depth;
break;
case PNG_COLOR_TYPE_RGBA:
sig_bits[0] = sBIT->red;
sig_bits[1] = sBIT->green;
sig_bits[2] = sBIT->blue;
sig_bits[3] = sBIT->alpha;
bpp = 4 * bit_depth;
break;
default:
display_log(dp, LIBPNG_ERROR, "invalid colour type %d",
color_type);
/*NOTREACHED*/
memset(sig_bits, 0, sizeof(sig_bits));
bpp = 0;
break;
}
{
int b;
for (b=0; 8*b<bpp; ++b)
{
/* libpng should catch this; if not there is a security issue
* because an app (like this one) may overflow an array. In fact
* libpng doesn't catch this at present.
*/
if (sig_bits[b] == 0 || sig_bits[b] > bit_depth/*!palette*/)
display_log(dp, LIBPNG_BUG,
"invalid sBIT[%u] value %d returned for PNG bit depth %d",
b, sig_bits[b], bit_depth);
}
}
if (bpp < 8 && bpp != bit_depth)
{
/* sanity check; this is a grayscale PNG; something is wrong in the
* code above.
*/
display_log(dp, INTERNAL_ERROR, "invalid bpp %u for bit_depth %u",
bpp, bit_depth);
}
switch (bit_depth)
{
int b;
case 16: /* Two bytes per component, big-endian */
for (b = (bpp >> 4); b > 0; --b)
{
unsigned int sig = (unsigned int)(0xffff0000 >> sig_bits[b]);
sig_bits[2*b+1] = (png_byte)sig;
sig_bits[2*b+0] = (png_byte)(sig >> 8); /* big-endian */
}
break;
case 8: /* One byte per component */
for (b=0; b*8 < bpp; ++b)
sig_bits[b] = (png_byte)(0xff00 >> sig_bits[b]);
break;
case 1: /* allowed, but dumb */
/* Value is 1 */
sig_bits[0] = 0xff;
break;
case 2: /* Replicate 4 times */
/* Value is 1 or 2 */
b = 0x3 & ((0x3<<2) >> sig_bits[0]);
b |= b << 2;
b |= b << 4;
sig_bits[0] = (png_byte)b;
break;
case 4: /* Replicate twice */
/* Value is 1, 2, 3 or 4 */
b = 0xf & ((0xf << 4) >> sig_bits[0]);
b |= b << 4;
sig_bits[0] = (png_byte)b;
break;
default:
display_log(dp, LIBPNG_BUG, "invalid bit depth %d", bit_depth);
break;
}
/* Convert bpp to bytes; this gives '1' for low-bit depth grayscale,
* where there are multiple pixels per byte.
*/
bpp = (bpp+7) >> 3;
/* The mask can be combined with sig_bits[0] */
if (mask != 0)
{
mask &= sig_bits[0];
if (bpp != 1 || mask == 0)
display_log(dp, INTERNAL_ERROR, "mask calculation error %u, %u",
bpp, mask);
}
for (y=0; y<height; ++y)
{
png_bytep row = rows[y];
png_bytep orig = dp->original_rows[y];
unsigned long x;
for (x=0; x<(width-(mask!=0)); ++x)
{
int b;
for (b=0; b<bpp; ++b)
{
if ((*row++ & sig_bits[b]) != (*orig++ & sig_bits[b]))
{
display_log(dp, APP_FAIL,
"significant bits at (%lu[%u],%lu) changed %.2x->%.2x",
x, b, y, orig[-1], row[-1]);
return 0;
}
}
}
if (mask != 0 && (*row & mask) != (*orig & mask))
{
display_log(dp, APP_FAIL,
"significant bits at (%lu[end],%lu) changed", x, y);
return 0;
}
} /* for y */
}
# else /* !sBIT */
display_log(dp, INTERNAL_ERROR,
"active shift transform but no sBIT support");
# endif /* !sBIT */
}
return 1; /* compare succeeded */
}
#ifdef PNG_WRITE_PNG_SUPPORTED
static void
buffer_write(struct display *dp, struct buffer *buffer, png_bytep data,
size_t size)
/* Generic write function used both from the write callback provided to
* libpng and from the generic read code.
*/
{
/* Write the data into the buffer, adding buffers as required */
struct buffer_list *last = buffer->last;
size_t end_count = buffer->end_count;
while (size > 0)
{
size_t avail;
if (end_count >= sizeof last->buffer)
{
if (last->next == NULL)
{
last = buffer_extend(last);
if (last == NULL)
display_log(dp, APP_ERROR, "out of memory saving file");
}
else
last = last->next;
buffer->last = last; /* avoid the need to rewrite every time */
end_count = 0;
}
avail = (sizeof last->buffer) - end_count;
if (avail > size)
avail = size;
memcpy(last->buffer + end_count, data, avail);
end_count += avail;
size -= avail;
data += avail;
}
buffer->end_count = end_count;
}
static void PNGCBAPI
write_function(png_structp pp, png_bytep data, size_t size)
{
buffer_write(get_dp(pp), get_buffer(pp), data, size);
}
static void
write_png(struct display *dp, png_infop ip, int transforms)
{
display_clean_write(dp); /* safety */
buffer_start_write(&dp->written_file);
dp->operation = "write";
dp->transforms = transforms;
dp->write_pp = png_create_write_struct(PNG_LIBPNG_VER_STRING, dp,
display_error, display_warning);
if (dp->write_pp == NULL)
display_log(dp, APP_ERROR, "failed to create write png_struct");
png_set_write_fn(dp->write_pp, &dp->written_file, write_function,
NULL/*flush*/);
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* Remove the user limits, if any */
png_set_user_limits(dp->write_pp, 0x7fffffff, 0x7fffffff);
# endif
/* Certain transforms require the png_info to be zapped to allow the
* transform to work correctly.
*/
if (transforms & (PNG_TRANSFORM_PACKING|
PNG_TRANSFORM_STRIP_FILLER|
PNG_TRANSFORM_STRIP_FILLER_BEFORE))
{
int ct = dp->color_type;
if (transforms & (PNG_TRANSFORM_STRIP_FILLER|
PNG_TRANSFORM_STRIP_FILLER_BEFORE))
ct &= ~PNG_COLOR_MASK_ALPHA;
png_set_IHDR(dp->write_pp, ip, dp->width, dp->height, dp->bit_depth, ct,
dp->interlace_method, dp->compression_method, dp->filter_method);
}
png_write_png(dp->write_pp, ip, transforms, NULL/*params*/);
/* Clean it on the way out - if control returns to the caller then the
* written_file contains the required data.
*/
display_clean_write(dp);
}
#endif /* WRITE_PNG */
static int
skip_transform(struct display *dp, int tr)
/* Helper to test for a bad combo and log it if it is skipped */
{
if ((dp->options & SKIP_BUGS) != 0 && is_bad_combo(tr))
{
/* Log this to stdout if logging is on, otherwise just do an information
* display_log.
*/
if ((dp->options & LOG_SKIPPED) != 0)
{
printf("SKIP: %s transforms ", dp->filename);
while (tr != 0)
{
int next = first_transform(tr);
tr &= ~next;
printf("%s", transform_name(next));
if (tr != 0)
putchar('+');
}
putchar('\n');
}
else
display_log(dp, INFORMATION, "%s: skipped known bad combo 0x%x",
dp->filename, tr);
return 1; /* skip */
}
return 0; /* don't skip */
}
static void
test_one_file(struct display *dp, const char *filename)
{
/* First cache the file and update the display original file
* information for the new file.
*/
dp->operation = "cache file";
dp->transforms = 0;
display_cache_file(dp, filename);
update_display(dp);
/* First test: if there are options that should be ignored for this file
* verify that they really are ignored.
*/
if (dp->ignored_transforms != 0)
{
read_png(dp, &dp->original_file, "ignored transforms",
dp->ignored_transforms);
/* The result should be identical to the original_rows */
if (!compare_read(dp, 0/*transforms applied*/))
return; /* no point testing more */
}
#ifdef PNG_WRITE_PNG_SUPPORTED
/* Second test: write the original PNG data out to a new file (to test the
* write side) then read the result back in and make sure that it hasn't
* changed.
*/
dp->operation = "write";
write_png(dp, dp->original_ip, 0/*transforms*/);
read_png(dp, &dp->written_file, NULL, 0/*transforms*/);
if (!compare_read(dp, 0/*transforms applied*/))
return;
#endif
/* Third test: the active options. Test each in turn, or, with the
* EXHAUSTIVE option, test all possible combinations.
*/
{
/* Use unsigned int here because the code below to increment through all
* the possibilities exhaustively has to use a compare and that must be
* unsigned, because some transforms are negative on a 16-bit system.
*/
unsigned int active = dp->active_transforms;
int exhaustive = (dp->options & EXHAUSTIVE) != 0;
unsigned int current = first_transform(active);
unsigned int bad_transforms = 0;
unsigned int bad_combo = ~0U; /* bitwise AND of failing transforms */
unsigned int bad_combo_list = 0; /* bitwise OR of failures */
for (;;)
{
read_png(dp, &dp->original_file, "active transforms", current);
/* If this involved any irreversible transformations then if we write
* it out with just the reversible transformations and read it in again
* with the same transforms we should get the same thing. At present
* this isn't done - it just seems like a waste of time and it would
* require two sets of read png_struct/png_info.
*
* If there were no irreversible transformations then if we write it
* out and read it back in again (without the reversible transforms)
* we should get back to the place where we started.
*/
#ifdef PNG_WRITE_PNG_SUPPORTED
if ((current & write_transforms) == current)
{
/* All transforms reversible: write the PNG with the transformations
* reversed, then read it back in with no transformations. The
* result should be the same as the original apart from the loss of
* low order bits because of the SHIFT/sBIT transform.
*/
dp->operation = "reversible transforms";
write_png(dp, dp->read_ip, current);
/* And if this is read back in, because all the transformations were
* reversible, the result should be the same.
*/
read_png(dp, &dp->written_file, NULL, 0);
if (!compare_read(dp, current/*for the SHIFT/sBIT transform*/))
{
/* This set of transforms failed. If a single bit is set - if
* there is just one transform - don't include this in further
* 'exhaustive' tests. Notice that each transform is tested on
* its own before testing combos in the exhaustive case.
*/
if (is_combo(current))
{
bad_combo &= current;
bad_combo_list |= current;
}
else
bad_transforms |= current;
}
}
#endif
/* Now move to the next transform */
if (exhaustive) /* all combinations */
{
unsigned int next = current;
do
{
if (next == read_transforms) /* Everything tested */
goto combo;
++next;
} /* skip known bad combos if the relevant option is set; skip
* combos involving known bad single transforms in all cases.
*/
while ( (next & read_transforms) <= current
|| (next & active) == 0 /* skip cases that do nothing */
|| (next & bad_transforms) != 0
|| skip_transform(dp, next));
assert((next & read_transforms) == next);
current = next;
}
else /* one at a time */
{
active &= ~current;
if (active == 0)
goto combo;
current = first_transform(active);
}
}
combo:
if (dp->options & FIND_BAD_COMBOS)
{
/* bad_combos identifies the combos that occur in all failing cases;
* bad_combo_list identifies transforms that do not prevent the
* failure.
*/
if (bad_combo != ~0U)
printf("%s[0x%x]: PROBLEM: 0x%x[0x%x] ANTIDOTE: 0x%x\n",
dp->filename, active, bad_combo, bad_combo_list,
rw_transforms & ~bad_combo_list);
else
printf("%s: no %sbad combos found\n", dp->filename,
(dp->options & SKIP_BUGS) ? "additional " : "");
}
}
}
static int
do_test(struct display *dp, const char *file)
/* Exists solely to isolate the setjmp clobbers */
{
int ret = setjmp(dp->error_return);
if (ret == 0)
{
test_one_file(dp, file);
return 0;
}
else if (ret < ERRORS) /* shouldn't longjmp on warnings */
display_log(dp, INTERNAL_ERROR, "unexpected return code %d", ret);
return ret;
}
int
main(int argc, char **argv)
{
/* For each file on the command line test it with a range of transforms */
int option_end, ilog = 0;
struct display d;
validate_T();
display_init(&d);
for (option_end=1; option_end<argc; ++option_end)
{
const char *name = argv[option_end];
if (strcmp(name, "--verbose") == 0)
d.options = (d.options & ~LEVEL_MASK) | VERBOSE;
else if (strcmp(name, "--warnings") == 0)
d.options = (d.options & ~LEVEL_MASK) | WARNINGS;
else if (strcmp(name, "--errors") == 0)
d.options = (d.options & ~LEVEL_MASK) | ERRORS;
else if (strcmp(name, "--quiet") == 0)
d.options = (d.options & ~LEVEL_MASK) | QUIET;
else if (strcmp(name, "--exhaustive") == 0)
d.options |= EXHAUSTIVE;
else if (strcmp(name, "--fast") == 0)
d.options &= ~EXHAUSTIVE;
else if (strcmp(name, "--strict") == 0)
d.options |= STRICT;
else if (strcmp(name, "--relaxed") == 0)
d.options &= ~STRICT;
else if (strcmp(name, "--log") == 0)
{
ilog = option_end; /* prevent display */
d.options |= LOG;
}
else if (strcmp(name, "--nolog") == 0)
d.options &= ~LOG;
else if (strcmp(name, "--continue") == 0)
d.options |= CONTINUE;
else if (strcmp(name, "--stop") == 0)
d.options &= ~CONTINUE;
else if (strcmp(name, "--skip-bugs") == 0)
d.options |= SKIP_BUGS;
else if (strcmp(name, "--test-all") == 0)
d.options &= ~SKIP_BUGS;
else if (strcmp(name, "--log-skipped") == 0)
d.options |= LOG_SKIPPED;
else if (strcmp(name, "--nolog-skipped") == 0)
d.options &= ~LOG_SKIPPED;
else if (strcmp(name, "--find-bad-combos") == 0)
d.options |= FIND_BAD_COMBOS;
else if (strcmp(name, "--nofind-bad-combos") == 0)
d.options &= ~FIND_BAD_COMBOS;
else if (strcmp(name, "--list-combos") == 0)
d.options |= LIST_COMBOS;
else if (strcmp(name, "--nolist-combos") == 0)
d.options &= ~LIST_COMBOS;
else if (name[0] == '-' && name[1] == '-')
{
fprintf(stderr, "pngimage: %s: unknown option\n", name);
return 99;
}
else
break; /* Not an option */
}
{
int i;
int errors = 0;
for (i=option_end; i<argc; ++i)
{
{
int ret = do_test(&d, argv[i]);
if (ret > QUIET) /* abort on user or internal error */
return 99;
}
/* Here on any return, including failures, except user/internal issues
*/
{
int pass = (d.options & STRICT) ?
RESULT_STRICT(d.results) : RESULT_RELAXED(d.results);
if (!pass)
++errors;
if (d.options & LOG)
{
int j;
printf("%s: pngimage ", pass ? "PASS" : "FAIL");
for (j=1; j<option_end; ++j)
if (j != ilog)
printf("%s ", argv[j]);
printf("%s\n", d.filename);
}
}
display_clean(&d);
}
/* Release allocated memory */
display_destroy(&d);
return errors != 0;
}
}
#else /* !READ_PNG */
int
main(void)
{
fprintf(stderr, "pngimage: no support for png_read/write_image\n");
return SKIP;
}
#endif
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