/* pngtest.c - a simple test program to test libpng
*
* Copyright (c) 2018-2023 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This program reads in a PNG image, writes it out again, and then
* compares the two files. If the files are identical, this shows that
* the basic chunk handling, filtering, and (de)compression code is working
* properly. It does not currently test all of the transforms, although
* it probably should.
*
* The program will report "FAIL" in certain legitimate cases:
* 1) when the compression level or filter selection method is changed.
* 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
* 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
* exist in the input file.
* 4) others not listed here...
* In these cases, it is best to check with another tool such as "pngcheck"
* to see what the differences between the two files are.
*
* If a filename is given on the command-line, then this file is used
* for the input, rather than the default "pngtest.png". This allows
* testing a wide variety of files easily. You can also test a number
* of files at once by typing "pngtest -m file1.png file2.png ..."
*/
#define _POSIX_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Defined so I can write to a file on gui/windowing platforms */
/* #define STDERR stderr */
#define STDERR stdout /* For DOS */
#include "png.h"
/* Known chunks that exist in pngtest.png must be supported or pngtest will fail
* simply as a result of re-ordering them. This may be fixed in 1.7
*
* pngtest allocates a single row buffer for each row and overwrites it,
* therefore if the write side doesn't support the writing of interlaced images
* nothing can be done for an interlaced image (and the code below will fail
* horribly trying to write extra data after writing garbage).
*/
#if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
defined PNG_READ_bKGD_SUPPORTED &&\
defined PNG_READ_cHRM_SUPPORTED &&\
defined PNG_READ_gAMA_SUPPORTED &&\
defined PNG_READ_oFFs_SUPPORTED &&\
defined PNG_READ_pCAL_SUPPORTED &&\
defined PNG_READ_pHYs_SUPPORTED &&\
defined PNG_READ_sBIT_SUPPORTED &&\
defined PNG_READ_sCAL_SUPPORTED &&\
defined PNG_READ_sRGB_SUPPORTED &&\
defined PNG_READ_sPLT_SUPPORTED &&\
defined PNG_READ_tEXt_SUPPORTED &&\
defined PNG_READ_tIME_SUPPORTED &&\
defined PNG_READ_zTXt_SUPPORTED &&\
(defined PNG_WRITE_INTERLACING_SUPPORTED || PNG_LIBPNG_VER >= 10700)
#ifdef PNG_ZLIB_HEADER
# include PNG_ZLIB_HEADER /* defined by pnglibconf.h from 1.7 */
#else
# include "zlib.h"
#endif
/* Copied from pngpriv.h but only used in error messages below. */
#ifndef PNG_ZBUF_SIZE
# define PNG_ZBUF_SIZE 8192
#endif
#define FCLOSE(file) fclose(file)
#ifndef PNG_STDIO_SUPPORTED
typedef FILE * png_FILE_p;
#endif
/* Makes pngtest verbose so we can find problems. */
#ifndef PNG_DEBUG
# define PNG_DEBUG 0
#endif
#if PNG_DEBUG > 1
# define pngtest_debug(m) ((void)fprintf(stderr, m "\n"))
# define pngtest_debug1(m,p1) ((void)fprintf(stderr, m "\n", p1))
# define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2))
#else
# define pngtest_debug(m) ((void)0)
# define pngtest_debug1(m,p1) ((void)0)
# define pngtest_debug2(m,p1,p2) ((void)0)
#endif
#if !PNG_DEBUG
# define SINGLE_ROWBUF_ALLOC /* Makes buffer overruns easier to nail */
#endif
#ifndef PNG_UNUSED
# define PNG_UNUSED(param) (void)param;
#endif
/* Turn on CPU timing
#define PNGTEST_TIMING
*/
#ifndef PNG_FLOATING_POINT_SUPPORTED
#undef PNGTEST_TIMING
#endif
#ifdef PNGTEST_TIMING
static float t_start, t_stop, t_decode, t_encode, t_misc;
#include <time.h>
#endif
#ifdef PNG_TIME_RFC1123_SUPPORTED
#define PNG_tIME_STRING_LENGTH 29
static int tIME_chunk_present = 0;
static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
#if PNG_LIBPNG_VER < 10619
#define png_convert_to_rfc1123_buffer(ts, t) tIME_to_str(read_ptr, ts, t)
static int
tIME_to_str(png_structp png_ptr, png_charp ts, png_const_timep t)
{
png_const_charp str = png_convert_to_rfc1123(png_ptr, t);
if (str == NULL)
return 0;
strcpy(ts, str);
return 1;
}
#endif /* older libpng */
#endif
static int verbose = 0;
static int strict = 0;
static int relaxed = 0;
static int xfail = 0;
static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
static int error_count = 0; /* count calls to png_error */
static int warning_count = 0; /* count calls to png_warning */
/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) png_ptr->jmpbuf
#endif
/* Defines for unknown chunk handling if required. */
#ifndef PNG_HANDLE_CHUNK_ALWAYS
# define PNG_HANDLE_CHUNK_ALWAYS 3
#endif
#ifndef PNG_HANDLE_CHUNK_IF_SAFE
# define PNG_HANDLE_CHUNK_IF_SAFE 2
#endif
/* Utility to save typing/errors, the argument must be a name */
#define MEMZERO(var) ((void)memset(&var, 0, sizeof var))
/* Example of using row callbacks to make a simple progress meter */
static int status_pass = 1;
static int status_dots_requested = 0;
static int status_dots = 1;
static void PNGCBAPI
read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
return;
if (status_pass != pass)
{
fprintf(stdout, "\n Pass %d: ", pass);
status_pass = pass;
status_dots = 31;
}
status_dots--;
if (status_dots == 0)
{
fprintf(stdout, "\n ");
status_dots=30;
}
fprintf(stdout, "r");
}
#ifdef PNG_WRITE_SUPPORTED
static void PNGCBAPI
write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
return;
fprintf(stdout, "w");
}
#endif
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
/* Example of using a user transform callback (doesn't do anything at present).
*/
static void PNGCBAPI
read_user_callback(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
PNG_UNUSED(png_ptr)
PNG_UNUSED(row_info)
PNG_UNUSED(data)
}
#endif
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
/* Example of using user transform callback (we don't transform anything,
* but merely count the zero samples)
*/
static png_uint_32 zero_samples;
static void PNGCBAPI
count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
png_bytep dp = data;
if (png_ptr == NULL)
return;
/* Contents of row_info:
* png_uint_32 width width of row
* png_uint_32 rowbytes number of bytes in row
* png_byte color_type color type of pixels
* png_byte bit_depth bit depth of samples
* png_byte channels number of channels (1-4)
* png_byte pixel_depth bits per pixel (depth*channels)
*/
/* Counts the number of zero samples (or zero pixels if color_type is 3 */
if (row_info->color_type == 0 || row_info->color_type == 3)
{
int pos = 0;
png_uint_32 n, nstop;
for (n = 0, nstop=row_info->width; n<nstop; n++)
{
if (row_info->bit_depth == 1)
{
if (((*dp << pos++ ) & 0x80) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
dp++;
}
}
if (row_info->bit_depth == 2)
{
if (((*dp << (pos+=2)) & 0xc0) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
dp++;
}
}
if (row_info->bit_depth == 4)
{
if (((*dp << (pos+=4)) & 0xf0) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
dp++;
}
}
if (row_info->bit_depth == 8)
if (*dp++ == 0)
zero_samples++;
if (row_info->bit_depth == 16)
{
if ((*dp | *(dp+1)) == 0)
zero_samples++;
dp+=2;
}
}
}
else /* Other color types */
{
png_uint_32 n, nstop;
int channel;
int color_channels = row_info->channels;
if (row_info->color_type > 3)
color_channels--;
for (n = 0, nstop=row_info->width; n<nstop; n++)
{
for (channel = 0; channel < color_channels; channel++)
{
if (row_info->bit_depth == 8)
if (*dp++ == 0)
zero_samples++;
if (row_info->bit_depth == 16)
{
if ((*dp | *(dp+1)) == 0)
zero_samples++;
dp+=2;
}
}
if (row_info->color_type > 3)
{
dp++;
if (row_info->bit_depth == 16)
dp++;
}
}
}
}
#endif /* WRITE_USER_TRANSFORM */
#ifndef PNG_STDIO_SUPPORTED
/* START of code to validate stdio-free compilation */
/* These copies of the default read/write functions come from pngrio.c and
* pngwio.c. They allow "don't include stdio" testing of the library.
* This is the function that does the actual reading of data. If you are
* not reading from a standard C stream, you should create a replacement
* read_data function and use it at run time with png_set_read_fn(), rather
* than changing the library.
*/
#ifdef PNG_IO_STATE_SUPPORTED
void
pngtest_check_io_state(png_structp png_ptr, size_t data_length,
png_uint_32 io_op);
void
pngtest_check_io_state(png_structp png_ptr, size_t data_length,
png_uint_32 io_op)
{
png_uint_32 io_state = png_get_io_state(png_ptr);
int err = 0;
/* Check if the current operation (reading / writing) is as expected. */
if ((io_state & PNG_IO_MASK_OP) != io_op)
png_error(png_ptr, "Incorrect operation in I/O state");
/* Check if the buffer size specific to the current location
* (file signature / header / data / crc) is as expected.
*/
switch (io_state & PNG_IO_MASK_LOC)
{
case PNG_IO_SIGNATURE:
if (data_length > 8)
err = 1;
break;
case PNG_IO_CHUNK_HDR:
if (data_length != 8)
err = 1;
break;
case PNG_IO_CHUNK_DATA:
break; /* no restrictions here */
case PNG_IO_CHUNK_CRC:
if (data_length != 4)
err = 1;
break;
default:
err = 1; /* uninitialized */
}
if (err != 0)
png_error(png_ptr, "Bad I/O state or buffer size");
}
#endif
static void PNGCBAPI
pngtest_read_data(png_structp png_ptr, png_bytep data, size_t length)
{
size_t check = 0;
png_voidp io_ptr;
/* fread() returns 0 on error, so it is OK to store this in a size_t
* instead of an int, which is what fread() actually returns.
*/
io_ptr = png_get_io_ptr(png_ptr);
if (io_ptr != NULL)
{
check = fread(data, 1, length, (png_FILE_p)io_ptr);
}
if (check != length)
{
png_error(png_ptr, "Read Error");
}
#ifdef PNG_IO_STATE_SUPPORTED
pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
#endif
}
#ifdef PNG_WRITE_FLUSH_SUPPORTED
static void PNGCBAPI
pngtest_flush(png_structp png_ptr)
{
/* Do nothing; fflush() is said to be just a waste of energy. */
PNG_UNUSED(png_ptr) /* Stifle compiler warning */
}
#endif
/* This is the function that does the actual writing of data. If you are
* not writing to a standard C stream, you should create a replacement
* write_data function and use it at run time with png_set_write_fn(), rather
* than changing the library.
*/
static void PNGCBAPI
pngtest_write_data(png_structp png_ptr, png_bytep data, size_t length)
{
size_t check;
check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
if (check != length)
{
png_error(png_ptr, "Write Error");
}
#ifdef PNG_IO_STATE_SUPPORTED
pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
#endif
}
#endif /* !STDIO */
/* This function is called when there is a warning, but the library thinks
* it can continue anyway. Replacement functions don't have to do anything
* here if you don't want to. In the default configuration, png_ptr is
* not used, but it is passed in case it may be useful.
*/
typedef struct
{
const char *file_name;
} pngtest_error_parameters;
static void PNGCBAPI
pngtest_warning(png_structp png_ptr, png_const_charp message)
{
const char *name = "UNKNOWN (ERROR!)";
pngtest_error_parameters *test =
(pngtest_error_parameters*)png_get_error_ptr(png_ptr);
++warning_count;
if (test != NULL && test->file_name != NULL)
name = test->file_name;
fprintf(STDERR, "\n%s: libpng warning: %s\n", name, message);
}
/* This is the default error handling function. Note that replacements for
* this function MUST NOT RETURN, or the program will likely crash. This
* function is used by default, or if the program supplies NULL for the
* error function pointer in png_set_error_fn().
*/
static void PNGCBAPI
pngtest_error(png_structp png_ptr, png_const_charp message)
{
++error_count;
pngtest_warning(png_ptr, message);
/* We can return because png_error calls the default handler, which is
* actually OK in this case.
*/
}
/* END of code to validate stdio-free compilation */
/* START of code to validate memory allocation and deallocation */
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
/* Allocate memory. For reasonable files, size should never exceed
* 64K. However, zlib may allocate more than 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_alloc_size_t size;
png_voidp pointer;
struct memory_information *next;
} memory_information;
typedef memory_information *memory_infop;
static memory_infop pinformation = NULL;
static int current_allocation = 0;
static int maximum_allocation = 0;
static int total_allocation = 0;
static int num_allocations = 0;
png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr,
png_alloc_size_t size));
void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
png_voidp
PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t 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 (NULL);
/* This calls the library allocator twice, once to get the requested
buffer and once to get a new free list entry. */
{
/* Disable malloc_fn and free_fn */
memory_infop pinfo;
png_set_mem_fn(png_ptr, NULL, NULL, NULL);
pinfo = (memory_infop)png_malloc(png_ptr,
(sizeof *pinfo));
pinfo->size = size;
current_allocation += size;
total_allocation += size;
num_allocations ++;
if (current_allocation > maximum_allocation)
maximum_allocation = current_allocation;
pinfo->pointer = png_malloc(png_ptr, size);
/* Restore malloc_fn and free_fn */
png_set_mem_fn(png_ptr,
NULL, png_debug_malloc, png_debug_free);
if (size != 0 && pinfo->pointer == NULL)
{
current_allocation -= size;
total_allocation -= size;
png_error(png_ptr,
"out of memory in pngtest->png_debug_malloc");
}
pinfo->next = pinformation;
pinformation = pinfo;
/* Make sure the caller isn't assuming zeroed memory. */
memset(pinfo->pointer, 0xdd, pinfo->size);
if (verbose != 0)
printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
pinfo->pointer);
return (png_voidp)(pinfo->pointer);
}
}
/* Free a pointer. It is removed from the list at the same time. */
void PNGCBAPI
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. */
if (pinformation != NULL)
{
memory_infop *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);
free(pinfo);
pinfo = NULL;
break;
}
if (pinfo->next == NULL)
{
fprintf(STDERR, "Pointer %p not found\n", ptr);
break;
}
ppinfo = &pinfo->next;
}
}
/* Finally free the data. */
if (verbose != 0)
printf("Freeing %p\n", ptr);
if (ptr != NULL)
free(ptr);
ptr = NULL;
}
#endif /* USER_MEM && DEBUG */
/* END of code to test memory allocation/deallocation */
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
/* Demonstration of user chunk support of the sTER and vpAg chunks */
/* (sTER is a public chunk not yet known by libpng. vpAg is a private
chunk used in ImageMagick to store "virtual page" size). */
static struct user_chunk_data
{
png_const_infop info_ptr;
png_uint_32 vpAg_width, vpAg_height;
png_byte vpAg_units;
png_byte sTER_mode;
int location[2];
}
user_chunk_data;
/* Used for location and order; zero means nothing. */
#define have_sTER 0x01
#define have_vpAg 0x02
#define before_PLTE 0x10
#define before_IDAT 0x20
#define after_IDAT 0x40
static void
init_callback_info(png_const_infop info_ptr)
{
MEMZERO(user_chunk_data);
user_chunk_data.info_ptr = info_ptr;
}
static int
set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
{
int location;
if ((data->location[0] & what) != 0 || (data->location[1] & what) != 0)
return 0; /* already have one of these */
/* Find where we are (the code below zeroes info_ptr to indicate that the
* chunks before the first IDAT have been read.)
*/
if (data->info_ptr == NULL) /* after IDAT */
location = what | after_IDAT;
else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE) != 0)
location = what | before_IDAT;
else
location = what | before_PLTE;
if (data->location[0] == 0)
data->location[0] = location;
else
data->location[1] = location;
return 1; /* handled */
}
static int PNGCBAPI
read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk)
{
struct user_chunk_data *my_user_chunk_data =
(struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
if (my_user_chunk_data == NULL)
png_error(png_ptr, "lost user chunk pointer");
/* Return one of the following:
* return (-n); chunk had an error
* return (0); did not recognize
* return (n); success
*
* The unknown chunk structure contains the chunk data:
* png_byte name[5];
* png_byte *data;
* size_t size;
*
* Note that libpng has already taken care of the CRC handling.
*/
if (chunk->name[0] == 115 && chunk->name[1] == 84 && /* s T */
chunk->name[2] == 69 && chunk->name[3] == 82) /* E R */
{
/* Found sTER chunk */
if (chunk->size != 1)
return (-1); /* Error return */
if (chunk->data[0] != 0 && chunk->data[0] != 1)
return (-1); /* Invalid mode */
if (set_location(png_ptr, my_user_chunk_data, have_sTER) != 0)
{
my_user_chunk_data->sTER_mode=chunk->data[0];
return (1);
}
else
return (0); /* duplicate sTER - give it to libpng */
}
if (chunk->name[0] != 118 || chunk->name[1] != 112 || /* v p */
chunk->name[2] != 65 || chunk->name[3] != 103) /* A g */
return (0); /* Did not recognize */
/* Found ImageMagick vpAg chunk */
if (chunk->size != 9)
return (-1); /* Error return */
if (set_location(png_ptr, my_user_chunk_data, have_vpAg) == 0)
return (0); /* duplicate vpAg */
my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data);
my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4);
my_user_chunk_data->vpAg_units = chunk->data[8];
return (1);
}
#ifdef PNG_WRITE_SUPPORTED
static void
write_sTER_chunk(png_structp write_ptr)
{
png_byte sTER[5] = {115, 84, 69, 82, '\0'};
if (verbose != 0)
fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
}
static void
write_vpAg_chunk(png_structp write_ptr)
{
png_byte vpAg[5] = {118, 112, 65, 103, '\0'};
png_byte vpag_chunk_data[9];
if (verbose != 0)
fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
(unsigned long)user_chunk_data.vpAg_width,
(unsigned long)user_chunk_data.vpAg_height,
user_chunk_data.vpAg_units);
png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
vpag_chunk_data[8] = user_chunk_data.vpAg_units;
png_write_chunk(write_ptr, vpAg, vpag_chunk_data, 9);
}
static void
write_chunks(png_structp write_ptr, int location)
{
int i;
/* Notice that this preserves the original chunk order, however chunks
* intercepted by the callback will be written *after* chunks passed to
* libpng. This will actually reverse a pair of sTER chunks or a pair of
* vpAg chunks, resulting in an error later. This is not worth worrying
* about - the chunks should not be duplicated!
*/
for (i=0; i<2; ++i)
{
if (user_chunk_data.location[i] == (location | have_sTER))
write_sTER_chunk(write_ptr);
else if (user_chunk_data.location[i] == (location | have_vpAg))
write_vpAg_chunk(write_ptr);
}
}
#endif /* WRITE */
#else /* !READ_USER_CHUNKS */
# define write_chunks(pp,loc) ((void)0)
#endif
/* END of code to demonstrate user chunk support */
/* START of code to check that libpng has the required text support; this only
* checks for the write support because if read support is missing the chunk
* will simply not be reported back to pngtest.
*/
#ifdef PNG_TEXT_SUPPORTED
static void
pngtest_check_text_support(png_structp png_ptr, png_textp text_ptr,
int num_text)
{
while (num_text > 0)
{
switch (text_ptr[--num_text].compression)
{
case PNG_TEXT_COMPRESSION_NONE:
break;
case PNG_TEXT_COMPRESSION_zTXt:
# ifndef PNG_WRITE_zTXt_SUPPORTED
++unsupported_chunks;
/* In libpng 1.7 this now does an app-error, so stop it: */
text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
# endif
break;
case PNG_ITXT_COMPRESSION_NONE:
case PNG_ITXT_COMPRESSION_zTXt:
# ifndef PNG_WRITE_iTXt_SUPPORTED
++unsupported_chunks;
text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
# endif
break;
default:
/* This is an error */
png_error(png_ptr, "invalid text chunk compression field");
break;
}
}
}
#endif
/* END of code to check that libpng has the required text support */
/* Test one file */
static int
test_one_file(const char *inname, const char *outname)
{
static png_FILE_p fpin;
static png_FILE_p fpout; /* "static" prevents setjmp corruption */
pngtest_error_parameters error_parameters;
png_structp read_ptr;
png_infop read_info_ptr, end_info_ptr;
#ifdef PNG_WRITE_SUPPORTED
png_structp write_ptr;
png_infop write_info_ptr;
png_infop write_end_info_ptr;
#ifdef PNG_WRITE_FILTER_SUPPORTED
int interlace_preserved = 1;
#endif /* WRITE_FILTER */
#else /* !WRITE */
png_structp write_ptr = NULL;
png_infop write_info_ptr = NULL;
png_infop write_end_info_ptr = NULL;
#endif /* !WRITE */
png_bytep row_buf;
png_uint_32 y;
png_uint_32 width, height;
volatile int num_passes;
int pass;
int bit_depth, color_type;
row_buf = NULL;
error_parameters.file_name = inname;
if ((fpin = fopen(inname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find input file %s\n", inname);
return (1);
}
if ((fpout = fopen(outname, "wb")) == NULL)
{
fprintf(STDERR, "Could not open output file %s\n", outname);
FCLOSE(fpin);
return (1);
}
pngtest_debug("Allocating read and write structures");
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
read_ptr =
png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
NULL, NULL, NULL, png_debug_malloc, png_debug_free);
#else
read_ptr =
png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
#endif
png_set_error_fn(read_ptr, &error_parameters, pngtest_error,
pngtest_warning);
#ifdef PNG_WRITE_SUPPORTED
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
write_ptr =
png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
NULL, NULL, NULL, png_debug_malloc, png_debug_free);
#else
write_ptr =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
#endif
png_set_error_fn(write_ptr, &error_parameters, pngtest_error,
pngtest_warning);
#endif
pngtest_debug("Allocating read_info, write_info and end_info structures");
read_info_ptr = png_create_info_struct(read_ptr);
end_info_ptr = png_create_info_struct(read_ptr);
#ifdef PNG_WRITE_SUPPORTED
write_info_ptr = png_create_info_struct(write_ptr);
write_end_info_ptr = png_create_info_struct(write_ptr);
#endif
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
init_callback_info(read_info_ptr);
png_set_read_user_chunk_fn(read_ptr, &user_chunk_data,
read_user_chunk_callback);
#endif
#ifdef PNG_SETJMP_SUPPORTED
pngtest_debug("Setting jmpbuf for read struct");
if (setjmp(png_jmpbuf(read_ptr)))
{
fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
png_free(read_ptr, row_buf);
row_buf = NULL;
if (verbose != 0)
fprintf(STDERR, " destroy read structs\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
#ifdef PNG_WRITE_SUPPORTED
if (verbose != 0)
fprintf(STDERR, " destroy write structs\n");
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
png_destroy_write_struct(&write_ptr, &write_info_ptr);
#endif
FCLOSE(fpin);
FCLOSE(fpout);
return (1);
}
#ifdef PNG_WRITE_SUPPORTED
pngtest_debug("Setting jmpbuf for write struct");
if (setjmp(png_jmpbuf(write_ptr)))
{
fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
png_free(read_ptr, row_buf);
row_buf = NULL;
if (verbose != 0)
fprintf(STDERR, " destroying read structs\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
if (verbose != 0)
fprintf(STDERR, " destroying write structs\n");
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
png_destroy_write_struct(&write_ptr, &write_info_ptr);
FCLOSE(fpin);
FCLOSE(fpout);
return (1);
}
#endif
#endif
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
if (strict != 0)
{
/* Treat png_benign_error() as errors on read */
png_set_benign_errors(read_ptr, 0);
# ifdef PNG_WRITE_SUPPORTED
/* Treat them as errors on write */
png_set_benign_errors(write_ptr, 0);
# endif
/* if strict is not set, then app warnings and errors are treated as
* warnings in release builds, but not in unstable builds; this can be
* changed with '--relaxed'.
*/
}
else if (relaxed != 0)
{
/* Allow application (pngtest) errors and warnings to pass */
png_set_benign_errors(read_ptr, 1);
/* Turn off CRC checking while reading */
png_set_crc_action(read_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
#ifdef PNG_IGNORE_ADLER32
/* Turn off ADLER32 checking while reading */
png_set_option(read_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
#endif
# ifdef PNG_WRITE_SUPPORTED
png_set_benign_errors(write_ptr, 1);
# endif
}
#endif /* BENIGN_ERRORS */
pngtest_debug("Initializing input and output streams");
#ifdef PNG_STDIO_SUPPORTED
png_init_io(read_ptr, fpin);
# ifdef PNG_WRITE_SUPPORTED
png_init_io(write_ptr, fpout);
# endif
#else
png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
# ifdef PNG_WRITE_SUPPORTED
png_set_write_fn(write_ptr, (png_voidp)fpout, pngtest_write_data,
# ifdef PNG_WRITE_FLUSH_SUPPORTED
pngtest_flush);
# else
NULL);
# endif
# endif
#endif
if (status_dots_requested == 1)
{
#ifdef PNG_WRITE_SUPPORTED
png_set_write_status_fn(write_ptr, write_row_callback);
#endif
png_set_read_status_fn(read_ptr, read_row_callback);
}
else
{
#ifdef PNG_WRITE_SUPPORTED
png_set_write_status_fn(write_ptr, NULL);
#endif
png_set_read_status_fn(read_ptr, NULL);
}
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
png_set_read_user_transform_fn(read_ptr, read_user_callback);
#endif
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
zero_samples = 0;
png_set_write_user_transform_fn(write_ptr, count_zero_samples);
#endif
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
/* Preserve all the unknown chunks, if possible. If this is disabled then,
* even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use
* libpng to *save* the unknown chunks on read (because we can't switch the
* save option on!)
*
* Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all
* unknown chunks and write will write them all.
*/
#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
NULL, 0);
#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
NULL, 0);
#endif
#endif
pngtest_debug("Reading info struct");
png_read_info(read_ptr, read_info_ptr);
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
/* This is a bit of a hack; there is no obvious way in the callback function
* to determine that the chunks before the first IDAT have been read, so
* remove the info_ptr (which is only used to determine position relative to
* PLTE) here to indicate that we are after the IDAT.
*/
user_chunk_data.info_ptr = NULL;
#endif
pngtest_debug("Transferring info struct");
{
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) != 0)
{
png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
color_type, interlace_type, compression_type, filter_type);
/* num_passes may not be available below if interlace support is not
* provided by libpng for both read and write.
*/
switch (interlace_type)
{
case PNG_INTERLACE_NONE:
num_passes = 1;
break;
case PNG_INTERLACE_ADAM7:
num_passes = 7;
break;
default:
png_error(read_ptr, "invalid interlace type");
/*NOT REACHED*/
}
}
else
png_error(read_ptr, "png_get_IHDR failed");
}
#ifdef PNG_FIXED_POINT_SUPPORTED
#ifdef PNG_cHRM_SUPPORTED
{
png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
blue_y;
if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
&red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
{
png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
red_y, green_x, green_y, blue_x, blue_y);
}
}
#endif
#ifdef PNG_gAMA_SUPPORTED
{
png_fixed_point gamma;
if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma) != 0)
png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
}
#endif
#else /* Use floating point versions */
#ifdef PNG_FLOATING_POINT_SUPPORTED
#ifdef PNG_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) != 0)
{
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
#ifdef PNG_gAMA_SUPPORTED
{
double gamma;
if (png_get_gAMA(read_ptr, read_info_ptr, &gamma) != 0)
png_set_gAMA(write_ptr, write_info_ptr, gamma);
}
#endif
#endif /* Floating point */
#endif /* Fixed point */
#ifdef PNG_iCCP_SUPPORTED
{
png_charp name;
png_bytep profile;
png_uint_32 proflen;
int compression_type;
if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
&profile, &proflen) != 0)
{
png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
profile, proflen);
}
}
#endif
#ifdef PNG_sRGB_SUPPORTED
{
int intent;
if (png_get_sRGB(read_ptr, read_info_ptr, &intent) != 0)
png_set_sRGB(write_ptr, write_info_ptr, intent);
}
#endif
{
png_colorp palette;
int num_palette;
if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette) != 0)
png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
}
#ifdef PNG_bKGD_SUPPORTED
{
png_color_16p background;
if (png_get_bKGD(read_ptr, read_info_ptr, &background) != 0)
{
png_set_bKGD(write_ptr, write_info_ptr, background);
}
}
#endif
#ifdef PNG_READ_eXIf_SUPPORTED
{
png_bytep exif=NULL;
png_uint_32 exif_length;
if (png_get_eXIf_1(read_ptr, read_info_ptr, &exif_length, &exif) != 0)
{
if (exif_length > 1)
fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
(unsigned long)exif_length);
# ifdef PNG_WRITE_eXIf_SUPPORTED
png_set_eXIf_1(write_ptr, write_info_ptr, exif_length, exif);
# endif
}
}
#endif
#ifdef PNG_hIST_SUPPORTED
{
png_uint_16p hist;
if (png_get_hIST(read_ptr, read_info_ptr, &hist) != 0)
png_set_hIST(write_ptr, write_info_ptr, hist);
}
#endif
#ifdef PNG_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) != 0)
{
png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
}
}
#endif
#ifdef PNG_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, ¶ms) != 0)
{
png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
nparams, units, params);
}
}
#endif
#ifdef PNG_pHYs_SUPPORTED
{
png_uint_32 res_x, res_y;
int unit_type;
if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y,
&unit_type) != 0)
png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
}
#endif
#ifdef PNG_sBIT_SUPPORTED
{
png_color_8p sig_bit;
if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit) != 0)
png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
}
#endif
#ifdef PNG_sCAL_SUPPORTED
#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
{
int unit;
double scal_width, scal_height;
if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
&scal_height) != 0)
{
png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
}
}
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
{
int unit;
png_charp scal_width, scal_height;
if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
&scal_height) != 0)
{
png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
scal_height);
}
}
#endif
#endif
#endif
#ifdef PNG_sPLT_SUPPORTED
{
png_sPLT_tp entries;
int num_entries = (int) png_get_sPLT(read_ptr, read_info_ptr, &entries);
if (num_entries)
{
png_set_sPLT(write_ptr, write_info_ptr, entries, num_entries);
}
}
#endif
#ifdef PNG_TEXT_SUPPORTED
{
png_textp text_ptr;
int num_text;
if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
{
pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
pngtest_check_text_support(read_ptr, text_ptr, num_text);
if (verbose != 0)
{
int i;
fprintf(STDERR,"\n");
for (i=0; i<num_text; i++)
{
fprintf(STDERR," Text compression[%d]=%d\n",
i, text_ptr[i].compression);
}
}
png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
}
}
#endif
#ifdef PNG_tIME_SUPPORTED
{
png_timep mod_time;
if (png_get_tIME(read_ptr, read_info_ptr, &mod_time) != 0)
{
png_set_tIME(write_ptr, write_info_ptr, mod_time);
#ifdef PNG_TIME_RFC1123_SUPPORTED
if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
tIME_string[(sizeof tIME_string) - 1] = '\0';
else
{
strncpy(tIME_string, "*** invalid time ***", (sizeof tIME_string));
tIME_string[(sizeof tIME_string) - 1] = '\0';
}
tIME_chunk_present++;
#endif /* TIME_RFC1123 */
}
}
#endif
#ifdef PNG_tRNS_SUPPORTED
{
png_bytep trans_alpha;
int num_trans;
png_color_16p trans_color;
if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
&trans_color) != 0)
{
int sample_max = (1 << bit_depth);
/* libpng doesn't reject a tRNS chunk with out-of-range samples */
if (!((color_type == PNG_COLOR_TYPE_GRAY &&
(int)trans_color->gray > sample_max) ||
(color_type == PNG_COLOR_TYPE_RGB &&
((int)trans_color->red > sample_max ||
(int)trans_color->green > sample_max ||
(int)trans_color->blue > sample_max))))
png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
trans_color);
}
}
#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
{
png_unknown_chunkp unknowns;
int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
&unknowns);
if (num_unknowns != 0)
{
png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
num_unknowns);
#if PNG_LIBPNG_VER < 10600
/* Copy the locations from the read_info_ptr. The automatically
* generated locations in write_end_info_ptr are wrong prior to 1.6.0
* because they are reset from the write pointer (removed in 1.6.0).
*/
{
int i;
for (i = 0; i < num_unknowns; i++)
png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
unknowns[i].location);
}
#endif
}
}
#endif
#ifdef PNG_WRITE_SUPPORTED
pngtest_debug("Writing info struct");
/* Write the info in two steps so that if we write the 'unknown' chunks here
* they go to the correct place.
*/
png_write_info_before_PLTE(write_ptr, write_info_ptr);
write_chunks(write_ptr, before_PLTE); /* before PLTE */
png_write_info(write_ptr, write_info_ptr);
write_chunks(write_ptr, before_IDAT); /* after PLTE */
png_write_info(write_ptr, write_end_info_ptr);
write_chunks(write_ptr, after_IDAT); /* after IDAT */
#ifdef PNG_COMPRESSION_COMPAT
/* Test the 'compatibility' setting here, if it is available. */
png_set_compression(write_ptr, PNG_COMPRESSION_COMPAT);
#endif
#endif
#ifdef SINGLE_ROWBUF_ALLOC
pngtest_debug("Allocating row buffer...");
row_buf = (png_bytep)png_malloc(read_ptr,
png_get_rowbytes(read_ptr, read_info_ptr));
pngtest_debug1("\t%p", row_buf);
#endif /* SINGLE_ROWBUF_ALLOC */
pngtest_debug("Writing row data");
#if defined(PNG_READ_INTERLACING_SUPPORTED) &&\
defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* Both must be defined for libpng to be able to handle the interlace,
* otherwise it gets handled below by simply reading and writing the passes
* directly.
*/
if (png_set_interlace_handling(read_ptr) != num_passes)
png_error(write_ptr,
"png_set_interlace_handling(read): wrong pass count ");
if (png_set_interlace_handling(write_ptr) != num_passes)
png_error(write_ptr,
"png_set_interlace_handling(write): wrong pass count ");
#else /* png_set_interlace_handling not called on either read or write */
# define calc_pass_height
#endif /* not using libpng interlace handling */
#ifdef PNGTEST_TIMING
t_stop = (float)clock();
t_misc += (t_stop - t_start);
t_start = t_stop;
#endif
for (pass = 0; pass < num_passes; pass++)
{
# ifdef calc_pass_height
png_uint_32 pass_height;
if (num_passes == 7) /* interlaced */
{
if (PNG_PASS_COLS(width, pass) > 0)
pass_height = PNG_PASS_ROWS(height, pass);
else
pass_height = 0;
}
else /* not interlaced */
pass_height = height;
# else
# define pass_height height
# endif
pngtest_debug1("Writing row data for pass %d", pass);
for (y = 0; y < pass_height; y++)
{
#ifndef SINGLE_ROWBUF_ALLOC
pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
row_buf = (png_bytep)png_malloc(read_ptr,
png_get_rowbytes(read_ptr, read_info_ptr));
pngtest_debug2("\t%p (%lu bytes)", row_buf,
(unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
#endif /* !SINGLE_ROWBUF_ALLOC */
png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
#ifdef PNG_WRITE_SUPPORTED
#ifdef PNGTEST_TIMING
t_stop = (float)clock();
t_decode += (t_stop - t_start);
t_start = t_stop;
#endif
png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
#ifdef PNGTEST_TIMING
t_stop = (float)clock();
t_encode += (t_stop - t_start);
t_start = t_stop;
#endif
#endif /* WRITE */
#ifndef SINGLE_ROWBUF_ALLOC
pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
png_free(read_ptr, row_buf);
row_buf = NULL;
#endif /* !SINGLE_ROWBUF_ALLOC */
}
}
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
# ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
# endif
# ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
# endif
#endif
pngtest_debug("Reading and writing end_info data");
png_read_end(read_ptr, end_info_ptr);
#ifdef PNG_TEXT_SUPPORTED
{
png_textp text_ptr;
int num_text;
if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
{
pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
pngtest_check_text_support(read_ptr, text_ptr, num_text);
if (verbose != 0)
{
int i;
fprintf(STDERR,"\n");
for (i=0; i<num_text; i++)
{
fprintf(STDERR," Text compression[%d]=%d\n",
i, text_ptr[i].compression);
}
}
png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
}
}
#endif
#ifdef PNG_READ_eXIf_SUPPORTED
{
png_bytep exif=NULL;
png_uint_32 exif_length;
if (png_get_eXIf_1(read_ptr, end_info_ptr, &exif_length, &exif) != 0)
{
if (exif_length > 1)
fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
(unsigned long)exif_length);
# ifdef PNG_WRITE_eXIf_SUPPORTED
png_set_eXIf_1(write_ptr, write_end_info_ptr, exif_length, exif);
# endif
}
}
#endif
#ifdef PNG_tIME_SUPPORTED
{
png_timep mod_time;
if (png_get_tIME(read_ptr, end_info_ptr, &mod_time) != 0)
{
png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
#ifdef PNG_TIME_RFC1123_SUPPORTED
if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
tIME_string[(sizeof tIME_string) - 1] = '\0';
else
{
strncpy(tIME_string, "*** invalid time ***", sizeof tIME_string);
tIME_string[(sizeof tIME_string)-1] = '\0';
}
tIME_chunk_present++;
#endif /* TIME_RFC1123 */
}
}
#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
{
png_unknown_chunkp unknowns;
int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
&unknowns);
if (num_unknowns != 0)
{
png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
num_unknowns);
#if PNG_LIBPNG_VER < 10600
/* Copy the locations from the read_info_ptr. The automatically
* generated locations in write_end_info_ptr are wrong prior to 1.6.0
* because they are reset from the write pointer (removed in 1.6.0).
*/
{
int i;
for (i = 0; i < num_unknowns; i++)
png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
unknowns[i].location);
}
#endif
}
}
#endif
#ifdef PNG_WRITE_SUPPORTED
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
/* Normally one would use Z_DEFAULT_STRATEGY for text compression.
* This is here just to make pngtest replicate the results from libpng
* versions prior to 1.5.4, and to test this new API.
*/
png_set_text_compression_strategy(write_ptr, Z_FILTERED);
#endif
/* When the unknown vpAg/sTER chunks are written by pngtest the only way to
* do it is to write them *before* calling png_write_end. When unknown
* chunks are written by libpng, however, they are written just before IEND.
* There seems to be no way round this, however vpAg/sTER are not expected
* after IDAT.
*/
write_chunks(write_ptr, after_IDAT);
png_write_end(write_ptr, write_end_info_ptr);
#endif
#ifdef PNG_EASY_ACCESS_SUPPORTED
if (verbose != 0)
{
png_uint_32 iwidth, iheight;
iwidth = png_get_image_width(write_ptr, write_info_ptr);
iheight = png_get_image_height(write_ptr, write_info_ptr);
fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
(unsigned long)iwidth, (unsigned long)iheight);
}
#endif
pngtest_debug("Destroying data structs");
#ifdef SINGLE_ROWBUF_ALLOC
pngtest_debug("destroying row_buf for read_ptr");
png_free(read_ptr, row_buf);
row_buf = NULL;
#endif /* SINGLE_ROWBUF_ALLOC */
pngtest_debug("destroying read_ptr, read_info_ptr, end_info_ptr");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
#ifdef PNG_WRITE_SUPPORTED
pngtest_debug("destroying write_end_info_ptr");
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
pngtest_debug("destroying write_ptr, write_info_ptr");
png_destroy_write_struct(&write_ptr, &write_info_ptr);
#endif
pngtest_debug("Destruction complete.");
FCLOSE(fpin);
FCLOSE(fpout);
/* Summarize any warnings or errors and in 'strict' mode fail the test.
* Unsupported chunks can result in warnings, in that case ignore the strict
* setting, otherwise fail the test on warnings as well as errors.
*/
if (error_count > 0)
{
/* We don't really expect to get here because of the setjmp handling
* above, but this is safe.
*/
fprintf(STDERR, "\n %s: %d libpng errors found (%d warnings)",
inname, error_count, warning_count);
if (strict != 0)
return (1);
}
# ifdef PNG_WRITE_SUPPORTED
/* If there is no write support nothing was written! */
else if (unsupported_chunks > 0)
{
fprintf(STDERR, "\n %s: unsupported chunks (%d)%s",
inname, unsupported_chunks, strict ? ": IGNORED --strict!" : "");
}
# endif
else if (warning_count > 0)
{
fprintf(STDERR, "\n %s: %d libpng warnings found",
inname, warning_count);
if (strict != 0)
return (1);
}
pngtest_debug("Opening files for comparison");
if ((fpin = fopen(inname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find file %s\n", inname);
return (1);
}
if ((fpout = fopen(outname, "rb")) == NULL)
{
fprintf(STDERR, "Could not find file %s\n", outname);
FCLOSE(fpin);
return (1);
}
#if defined (PNG_WRITE_SUPPORTED) /* else nothing was written */ &&\
defined (PNG_WRITE_FILTER_SUPPORTED)
if (interlace_preserved != 0) /* else the files will be changed */
{
for (;;)
{
static int wrote_question = 0;
size_t num_in, num_out;
char inbuf[256], outbuf[256];
num_in = fread(inbuf, 1, sizeof inbuf, fpin);
num_out = fread(outbuf, 1, sizeof outbuf, fpout);
if (num_in != num_out)
{
fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
inname, outname);
if (wrote_question == 0 && unsupported_chunks == 0)
{
fprintf(STDERR,
" Was %s written with the same maximum IDAT"
" chunk size (%d bytes),",
inname, PNG_ZBUF_SIZE);
fprintf(STDERR,
"\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
" level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question = 1;
}
FCLOSE(fpin);
FCLOSE(fpout);
if (strict != 0 && unsupported_chunks == 0)
return (1);
else
return (0);
}
if (num_in == 0)
break;
if (memcmp(inbuf, outbuf, num_in))
{
fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
outname);
if (wrote_question == 0 && unsupported_chunks == 0)
{
fprintf(STDERR,
" Was %s written with the same maximum"
" IDAT chunk size (%d bytes),",
inname, PNG_ZBUF_SIZE);
fprintf(STDERR,
"\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
" level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question = 1;
}
FCLOSE(fpin);
FCLOSE(fpout);
/* NOTE: the unsupported_chunks escape is permitted here because
* unsupported text chunk compression will result in the compression
* mode being changed (to NONE) yet, in the test case, the result
* can be exactly the same size!
*/
if (strict != 0 && unsupported_chunks == 0)
return (1);
else
return (0);
}
}
}
#endif /* WRITE && WRITE_FILTER */
FCLOSE(fpin);
FCLOSE(fpout);
return (0);
}
/* Input and output filenames */
#ifdef RISCOS
static const char *inname = "pngtest/png";
static const char *outname = "pngout/png";
#else
static const char *inname = "pngtest.png";
static const char *outname = "pngout.png";
#endif
int
main(int argc, char *argv[])
{
int multiple = 0;
int ierror = 0;
png_structp dummy_ptr;
fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION);
fprintf(STDERR, "%s", png_get_copyright(NULL));
/* Show the version of libpng used in building the library */
fprintf(STDERR, " library (%lu):%s",
(unsigned long)png_access_version_number(),
png_get_header_version(NULL));
/* Show the version of libpng used in building the application */
fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
PNG_HEADER_VERSION_STRING);
/* Do some consistency checking on the memory allocation settings, I'm
* not sure this matters, but it is nice to know, the first of these
* tests should be impossible because of the way the macros are set
* in pngconf.h
*/
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
#endif
/* I think the following can happen. */
#if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
#endif
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);
++ierror;
}
if (argc > 1)
{
if (strcmp(argv[1], "-m") == 0)
{
multiple = 1;
status_dots_requested = 0;
}
else if (strcmp(argv[1], "-mv") == 0 ||
strcmp(argv[1], "-vm") == 0 )
{
multiple = 1;
verbose = 1;
status_dots_requested = 1;
}
else if (strcmp(argv[1], "-v") == 0)
{
verbose = 1;
status_dots_requested = 1;
inname = argv[2];
}
else if (strcmp(argv[1], "--strict") == 0)
{
status_dots_requested = 0;
verbose = 1;
inname = argv[2];
strict++;
relaxed = 0;
multiple=1;
}
else if (strcmp(argv[1], "--relaxed") == 0)
{
status_dots_requested = 0;
verbose = 1;
inname = argv[2];
strict = 0;
relaxed++;
multiple=1;
}
else if (strcmp(argv[1], "--xfail") == 0)
{
status_dots_requested = 0;
verbose = 1;
inname = argv[2];
strict = 0;
xfail++;
relaxed++;
multiple=1;
}
else
{
inname = argv[1];
status_dots_requested = 0;
}
}
if (multiple == 0 && argc == 3 + verbose)
outname = argv[2 + verbose];
if ((multiple == 0 && argc > 3 + verbose) ||
(multiple != 0 && argc < 2))
{
fprintf(STDERR,
"usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
argv[0], argv[0]);
fprintf(STDERR,
" reads/writes one PNG file (without -m) or multiple files (-m)\n");
fprintf(STDERR,
" with -m %s is used as a temporary file\n", outname);
exit(1);
}
if (multiple != 0)
{
int i;
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
int allocation_now = current_allocation;
#endif
for (i=2; i<argc; ++i)
{
int kerror;
fprintf(STDERR, "\n Testing %s:", argv[i]);
#if PNG_DEBUG > 0
fprintf(STDERR, "\n");
#endif
kerror = test_one_file(argv[i], outname);
if (kerror == 0)
{
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
fprintf(STDERR, "\n PASS (%lu zero samples)\n",
(unsigned long)zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
#ifdef PNG_TIME_RFC1123_SUPPORTED
if (tIME_chunk_present != 0)
fprintf(STDERR, " tIME = %s\n", tIME_string);
tIME_chunk_present = 0;
#endif /* TIME_RFC1123 */
}
else
{
if (xfail)
fprintf(STDERR, " XFAIL\n");
else
{
fprintf(STDERR, " FAIL\n");
ierror += kerror;
}
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation - allocation_now);
if (current_allocation != 0)
{
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL)
{
fprintf(STDERR, " %lu bytes at %p\n",
(unsigned long)pinfo->size,
pinfo->pointer);
pinfo = pinfo->next;
}
}
#endif
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
fprintf(STDERR, " Current memory allocation: %10d bytes\n",
current_allocation);
fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
maximum_allocation);
fprintf(STDERR, " Total memory allocation: %10d bytes\n",
total_allocation);
fprintf(STDERR, " Number of allocations: %10d\n",
num_allocations);
#endif
}
else
{
int i;
for (i = 0; i<3; ++i)
{
int kerror;
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
int allocation_now = current_allocation;
#endif
if (i == 1)
status_dots_requested = 1;
else if (verbose == 0)
status_dots_requested = 0;
if (i == 0 || verbose == 1 || ierror != 0)
{
fprintf(STDERR, "\n Testing %s:", inname);
#if PNG_DEBUG > 0
fprintf(STDERR, "\n");
#endif
}
kerror = test_one_file(inname, outname);
if (kerror == 0)
{
if (verbose == 1 || i == 2)
{
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
fprintf(STDERR, "\n PASS (%lu zero samples)\n",
(unsigned long)zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
#ifdef PNG_TIME_RFC1123_SUPPORTED
if (tIME_chunk_present != 0)
fprintf(STDERR, " tIME = %s\n", tIME_string);
#endif /* TIME_RFC1123 */
}
}
else
{
if (verbose == 0 && i != 2)
{
fprintf(STDERR, "\n Testing %s:", inname);
#if PNG_DEBUG > 0
fprintf(STDERR, "\n");
#endif
}
if (xfail)
fprintf(STDERR, " XFAIL\n");
else
{
fprintf(STDERR, " FAIL\n");
ierror += kerror;
}
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation - allocation_now);
if (current_allocation != 0)
{
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL)
{
fprintf(STDERR, " %lu bytes at %p\n",
(unsigned long)pinfo->size, pinfo->pointer);
pinfo = pinfo->next;
}
}
#endif
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
fprintf(STDERR, " Current memory allocation: %10d bytes\n",
current_allocation);
fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
maximum_allocation);
fprintf(STDERR, " Total memory allocation: %10d bytes\n",
total_allocation);
fprintf(STDERR, " Number of allocations: %10d\n",
num_allocations);
#endif
}
#ifdef PNGTEST_TIMING
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);
#endif
if (ierror == 0)
fprintf(STDERR, " libpng passes test\n");
else
fprintf(STDERR, " libpng FAILS test\n");
dummy_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
fprintf(STDERR, " Default limits:\n");
fprintf(STDERR, " width_max = %lu\n",
(unsigned long) png_get_user_width_max(dummy_ptr));
fprintf(STDERR, " height_max = %lu\n",
(unsigned long) png_get_user_height_max(dummy_ptr));
if (png_get_chunk_cache_max(dummy_ptr) == 0)
fprintf(STDERR, " cache_max = unlimited\n");
else
fprintf(STDERR, " cache_max = %lu\n",
(unsigned long) png_get_chunk_cache_max(dummy_ptr));
if (png_get_chunk_malloc_max(dummy_ptr) == 0)
fprintf(STDERR, " malloc_max = unlimited\n");
else
fprintf(STDERR, " malloc_max = %lu\n",
(unsigned long) png_get_chunk_malloc_max(dummy_ptr));
png_destroy_read_struct(&dummy_ptr, NULL, NULL);
return (int)(ierror != 0);
}
#else
int
main(void)
{
fprintf(STDERR,
" test ignored because libpng was not built with read support\n");
/* And skip this test */
return PNG_LIBPNG_VER < 10600 ? 0 : 77;
}
#endif
/* Generate a compiler error if there is an old png.h in the search path. */
typedef png_libpng_version_1_6_41_git Your_png_h_is_not_version_1_6_41_git;
