1 

     2 /* pngtest.c - a simple test program to test libpng

     3  *

     4  * Last changed in libpng 1.2.37 [June 4, 2009]

     5  * Copyright (c) 1998-2009 Glenn Randers-Pehrson

     6  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

     7  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

     8  *

     9  * This code is released under the libpng license.

    10  * For conditions of distribution and use, see the disclaimer

    11  * and license in png.h

    12  *

    13  * This program reads in a PNG image, writes it out again, and then

    14  * compares the two files.  If the files are identical, this shows that

    15  * the basic chunk handling, filtering, and (de)compression code is working

    16  * properly.  It does not currently test all of the transforms, although

    17  * it probably should.

    18  *

    19  * The program will report "FAIL" in certain legitimate cases:

    20  * 1) when the compression level or filter selection method is changed.

    21  * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.

    22  * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks

    23  *    exist in the input file.

    24  * 4) others not listed here...

    25  * In these cases, it is best to check with another tool such as "pngcheck"

    26  * to see what the differences between the two files are.

    27  *

    28  * If a filename is given on the command-line, then this file is used

    29  * for the input, rather than the default "pngtest.png".  This allows

    30  * testing a wide variety of files easily.  You can also test a number

    31  * of files at once by typing "pngtest -m file1.png file2.png ..."

    32  */

    33 

    34 #include "png.h"

    35 

    36 #if defined(_WIN32_WCE)

    37 #  if _WIN32_WCE < 211

    38      __error__ (f|w)printf functions are not supported on old WindowsCE.;

    39 #  endif

    40 #  include <windows.h>

    41 #  include <stdlib.h>

    42 #  define READFILE(file, data, length, check) \

    43      if (ReadFile(file, data, length, &check, NULL)) check = 0

    44 #  define WRITEFILE(file, data, length, check)) \

    45      if (WriteFile(file, data, length, &check, NULL)) check = 0

    46 #  define FCLOSE(file) CloseHandle(file)

    47 #else

    48 #  include <stdio.h>

    49 #  include <stdlib.h>

    50 #  define READFILE(file, data, length, check) \

    51      check=(png_size_t)fread(data, (png_size_t)1, length, file)

    52 #  define WRITEFILE(file, data, length, check) \

    53      check=(png_size_t)fwrite(data, (png_size_t)1, length, file)

    54 #  define FCLOSE(file) fclose(file)

    55 #endif

    56 

    57 #if defined(PNG_NO_STDIO)

    58 #  if defined(_WIN32_WCE)

    59      typedef HANDLE                png_FILE_p;

    60 #  else

    61      typedef FILE                * png_FILE_p;

    62 #  endif

    63 #endif

    64 

    65 /* Makes pngtest verbose so we can find problems (needs to be before png.h) */

    66 #ifndef PNG_DEBUG

    67 #  define PNG_DEBUG 0

    68 #endif

    69 

    70 #if !PNG_DEBUG

    71 #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */

    72 #endif

    73 

    74 /* Turn on CPU timing

    75 #define PNGTEST_TIMING

    76 */

    77 

    78 #ifdef PNG_NO_FLOATING_POINT_SUPPORTED

    79 #undef PNGTEST_TIMING

    80 #endif

    81 

    82 #ifdef PNGTEST_TIMING

    83 static float t_start, t_stop, t_decode, t_encode, t_misc;

    84 #include <time.h>

    85 #endif

    86 

    87 #if defined(PNG_TIME_RFC1123_SUPPORTED)

    88 #define PNG_tIME_STRING_LENGTH 29

    89 static int tIME_chunk_present = 0;

    90 static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";

    91 #endif

    92 

    93 static int verbose = 0;

    94 

    95 int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));

    96 

    97 #ifdef __TURBOC__

    98 #include <mem.h>

    99 #endif

   100 

   101 /* Defined so I can write to a file on gui/windowing platforms */

   102 /*  #define STDERR stderr  */

   103 #define STDERR stdout   /* For DOS */

   104 

   105 /* In case a system header (e.g., on AIX) defined jmpbuf */

   106 #ifdef jmpbuf

   107 #  undef jmpbuf

   108 #endif

   109 

   110 /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */

   111 #ifndef png_jmpbuf

   112 #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf

   113 #endif

   114 

   115 /* Example of using row callbacks to make a simple progress meter */

   116 static int status_pass = 1;

   117 static int status_dots_requested = 0;

   118 static int status_dots = 1;

   119 

   120 void

   121 #ifdef PNG_1_0_X

   122 PNGAPI

   123 #endif

   124 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);

   125 void

   126 #ifdef PNG_1_0_X

   127 PNGAPI

   128 #endif

   129 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)

   130 {

   131    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)

   132       return;

   133    if (status_pass != pass)

   134    {

   135       fprintf(stdout, "\n Pass %d: ", pass);

   136       status_pass = pass;

   137       status_dots = 31;

   138    }

   139    status_dots--;

   140    if (status_dots == 0)

   141    {

   142       fprintf(stdout, "\n         ");

   143       status_dots=30;

   144    }

   145    fprintf(stdout, "r");

   146 }

   147 

   148 void

   149 #ifdef PNG_1_0_X

   150 PNGAPI

   151 #endif

   152 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);

   153 void

   154 #ifdef PNG_1_0_X

   155 PNGAPI

   156 #endif

   157 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)

   158 {

   159    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)

   160       return;

   161    fprintf(stdout, "w");

   162 }

   163 

   164 

   165 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)

   166 /* Example of using user transform callback (we don't transform anything,

   167  * but merely examine the row filters.  We set this to 256 rather than

   168  * 5 in case illegal filter values are present.)

   169  */

   170 static png_uint_32 filters_used[256];

   171 void

   172 #ifdef PNG_1_0_X

   173 PNGAPI

   174 #endif

   175 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data);

   176 void

   177 #ifdef PNG_1_0_X

   178 PNGAPI

   179 #endif

   180 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)

   181 {

   182    if (png_ptr != NULL && row_info != NULL)

   183       ++filters_used[*(data - 1)];

   184 }

   185 #endif

   186 

   187 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

   188 /* Example of using user transform callback (we don't transform anything,

   189  * but merely count the zero samples)

   190  */

   191 

   192 static png_uint_32 zero_samples;

   193 

   194 void

   195 #ifdef PNG_1_0_X

   196 PNGAPI

   197 #endif

   198 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data);

   199 void

   200 #ifdef PNG_1_0_X

   201 PNGAPI

   202 #endif

   203 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)

   204 {

   205    png_bytep dp = data;

   206    if (png_ptr == NULL)return;

   207 

   208    /* Contents of row_info:

   209     *  png_uint_32 width      width of row

   210     *  png_uint_32 rowbytes   number of bytes in row

   211     *  png_byte color_type    color type of pixels

   212     *  png_byte bit_depth     bit depth of samples

   213     *  png_byte channels      number of channels (1-4)

   214     *  png_byte pixel_depth   bits per pixel (depth*channels)

   215     */

   216 

   217     /* Counts the number of zero samples (or zero pixels if color_type is 3 */

   218 

   219     if (row_info->color_type == 0 || row_info->color_type == 3)

   220     {

   221        int pos = 0;

   222        png_uint_32 n, nstop;

   223        for (n = 0, nstop=row_info->width; n<nstop; n++)

   224        {

   225           if (row_info->bit_depth == 1)

   226           {

   227              if (((*dp << pos++ ) & 0x80) == 0)

   228                 zero_samples++;

   229              if (pos == 8)

   230              {

   231                 pos = 0;

   232                 dp++;

   233              }

   234           }

   235           if (row_info->bit_depth == 2)

   236           {

   237              if (((*dp << (pos+=2)) & 0xc0) == 0)

   238                 zero_samples++;

   239              if (pos == 8)

   240              {

   241                 pos = 0;

   242                 dp++;

   243              }

   244           }

   245           if (row_info->bit_depth == 4)

   246           {

   247              if (((*dp << (pos+=4)) & 0xf0) == 0)

   248                 zero_samples++;

   249              if (pos == 8)

   250              {

   251                 pos = 0;

   252                 dp++;

   253              }

   254           }

   255           if (row_info->bit_depth == 8)

   256              if (*dp++ == 0)

   257                 zero_samples++;

   258           if (row_info->bit_depth == 16)

   259           {

   260              if ((*dp | *(dp+1)) == 0)

   261                 zero_samples++;

   262              dp+=2;

   263           }

   264        }

   265     }

   266     else /* Other color types */

   267     {

   268        png_uint_32 n, nstop;

   269        int channel;

   270        int color_channels = row_info->channels;

   271        if (row_info->color_type > 3)color_channels--;

   272 

   273        for (n = 0, nstop=row_info->width; n<nstop; n++)

   274        {

   275           for (channel = 0; channel < color_channels; channel++)

   276           {

   277              if (row_info->bit_depth == 8)

   278                 if (*dp++ == 0)

   279                    zero_samples++;

   280              if (row_info->bit_depth == 16)

   281              {

   282                 if ((*dp | *(dp+1)) == 0)

   283                    zero_samples++;

   284                 dp+=2;

   285              }

   286           }

   287           if (row_info->color_type > 3)

   288           {

   289              dp++;

   290              if (row_info->bit_depth == 16)

   291                 dp++;

   292           }

   293        }

   294     }

   295 }

   296 #endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */

   297 

   298 static int wrote_question = 0;

   299 

   300 #if defined(PNG_NO_STDIO)

   301 /* START of code to validate stdio-free compilation */

   302 /* These copies of the default read/write functions come from pngrio.c and

   303  * pngwio.c.  They allow "don't include stdio" testing of the library.

   304  * This is the function that does the actual reading of data.  If you are

   305  * not reading from a standard C stream, you should create a replacement

   306  * read_data function and use it at run time with png_set_read_fn(), rather

   307  * than changing the library.

   308  */

   309 

   310 #ifndef USE_FAR_KEYWORD

   311 static void

   312 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   313 {

   314    png_size_t check;

   315 

   316    /* fread() returns 0 on error, so it is OK to store this in a png_size_t

   317     * instead of an int, which is what fread() actually returns.

   318     */

   319    READFILE((png_FILE_p)png_ptr->io_ptr, data, length, check);

   320 

   321    if (check != length)

   322    {

   323       png_error(png_ptr, "Read Error!");

   324    }

   325 }

   326 #else

   327 /* This is the model-independent version. Since the standard I/O library

   328    can't handle far buffers in the medium and small models, we have to copy

   329    the data.

   330 */

   331 

   332 #define NEAR_BUF_SIZE 1024

   333 #define MIN(a,b) (a <= b ? a : b)

   334 

   335 static void

   336 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   337 {

   338    int check;

   339    png_byte *n_data;

   340    png_FILE_p io_ptr;

   341 

   342    /* Check if data really is near. If so, use usual code. */

   343    n_data = (png_byte *)CVT_PTR_NOCHECK(data);

   344    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);

   345    if ((png_bytep)n_data == data)

   346    {

   347       READFILE(io_ptr, n_data, length, check);

   348    }

   349    else

   350    {

   351       png_byte buf[NEAR_BUF_SIZE];

   352       png_size_t read, remaining, err;

   353       check = 0;

   354       remaining = length;

   355       do

   356       {

   357          read = MIN(NEAR_BUF_SIZE, remaining);

   358          READFILE(io_ptr, buf, 1, err);

   359          png_memcpy(data, buf, read); /* Copy far buffer to near buffer */

   360          if (err != read)

   361             break;

   362          else

   363             check += err;

   364          data += read;

   365          remaining -= read;

   366       }

   367       while (remaining != 0);

   368    }

   369    if (check != length)

   370       png_error(png_ptr, "read Error");

   371 }

   372 #endif /* USE_FAR_KEYWORD */

   373 

   374 #if defined(PNG_WRITE_FLUSH_SUPPORTED)

   375 static void

   376 pngtest_flush(png_structp png_ptr)

   377 {

   378    /* Do nothing; fflush() is said to be just a waste of energy. */

   379    png_ptr = png_ptr;  /* Stifle compiler warning */

   380 }

   381 #endif

   382 

   383 /* This is the function that does the actual writing of data.  If you are

   384  * not writing to a standard C stream, you should create a replacement

   385  * write_data function and use it at run time with png_set_write_fn(), rather

   386  * than changing the library.

   387  */

   388 #ifndef USE_FAR_KEYWORD

   389 static void

   390 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)

   391 {

   392    png_uint_32 check;

   393 

   394    WRITEFILE((png_FILE_p)png_ptr->io_ptr,  data, length, check);

   395    if (check != length)

   396    {

   397       png_error(png_ptr, "Write Error");

   398    }

   399 }

   400 #else

   401 /* This is the model-independent version. Since the standard I/O library

   402    can't handle far buffers in the medium and small models, we have to copy

   403    the data.

   404 */

   405 

   406 #define NEAR_BUF_SIZE 1024

   407 #define MIN(a,b) (a <= b ? a : b)

   408 

   409 static void

   410 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)

   411 {

   412    png_uint_32 check;

   413    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */

   414    png_FILE_p io_ptr;

   415 

   416    /* Check if data really is near. If so, use usual code. */

   417    near_data = (png_byte *)CVT_PTR_NOCHECK(data);

   418    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);

   419    if ((png_bytep)near_data == data)

   420    {

   421       WRITEFILE(io_ptr, near_data, length, check);

   422    }

   423    else

   424    {

   425       png_byte buf[NEAR_BUF_SIZE];

   426       png_size_t written, remaining, err;

   427       check = 0;

   428       remaining = length;

   429       do

   430       {

   431          written = MIN(NEAR_BUF_SIZE, remaining);

   432          png_memcpy(buf, data, written); /* Copy far buffer to near buffer */

   433          WRITEFILE(io_ptr, buf, written, err);

   434          if (err != written)

   435             break;

   436          else

   437             check += err;

   438          data += written;

   439          remaining -= written;

   440       }

   441       while (remaining != 0);

   442    }

   443    if (check != length)

   444    {

   445       png_error(png_ptr, "Write Error");

   446    }

   447 }

   448 #endif /* USE_FAR_KEYWORD */

   449 

   450 /* This function is called when there is a warning, but the library thinks

   451  * it can continue anyway.  Replacement functions don't have to do anything

   452  * here if you don't want to.  In the default configuration, png_ptr is

   453  * not used, but it is passed in case it may be useful.

   454  */

   455 static void

   456 pngtest_warning(png_structp png_ptr, png_const_charp message)

   457 {

   458    PNG_CONST char *name = "UNKNOWN (ERROR!)";

   459    if (png_ptr != NULL && png_ptr->error_ptr != NULL)

   460       name = png_ptr->error_ptr;

   461    fprintf(STDERR, "%s: libpng warning: %s\n", name, message);

   462 }

   463 

   464 /* This is the default error handling function.  Note that replacements for

   465  * this function MUST NOT RETURN, or the program will likely crash.  This

   466  * function is used by default, or if the program supplies NULL for the

   467  * error function pointer in png_set_error_fn().

   468  */

   469 static void

   470 pngtest_error(png_structp png_ptr, png_const_charp message)

   471 {

   472    pngtest_warning(png_ptr, message);

   473    /* We can return because png_error calls the default handler, which is

   474     * actually OK in this case.

   475     */

   476 }

   477 #endif /* PNG_NO_STDIO */

   478 /* END of code to validate stdio-free compilation */

   479 

   480 /* START of code to validate memory allocation and deallocation */

   481 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG

   482 

   483 /* Allocate memory.  For reasonable files, size should never exceed

   484  * 64K.  However, zlib may allocate more then 64K if you don't tell

   485  * it not to.  See zconf.h and png.h for more information.  zlib does

   486  * need to allocate exactly 64K, so whatever you call here must

   487  * have the ability to do that.

   488  *

   489  * This piece of code can be compiled to validate max 64K allocations

   490  * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.

   491  */

   492 typedef struct memory_information

   493 {

   494    png_uint_32               size;

   495    png_voidp                 pointer;

   496    struct memory_information FAR *next;

   497 } memory_information;

   498 typedef memory_information FAR *memory_infop;

   499 

   500 static memory_infop pinformation = NULL;

   501 static int current_allocation = 0;

   502 static int maximum_allocation = 0;

   503 static int total_allocation = 0;

   504 static int num_allocations = 0;

   505 

   506 png_voidp png_debug_malloc PNGARG((png_structp png_ptr, png_uint_32 size));

   507 void png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));

   508 

   509 png_voidp

   510 png_debug_malloc(png_structp png_ptr, png_uint_32 size)

   511 {

   512 

   513    /* png_malloc has already tested for NULL; png_create_struct calls

   514     * png_debug_malloc directly, with png_ptr == NULL which is OK

   515     */

   516 

   517    if (size == 0)

   518       return (NULL);

   519 

   520    /* This calls the library allocator twice, once to get the requested

   521       buffer and once to get a new free list entry. */

   522    {

   523       /* Disable malloc_fn and free_fn */

   524       memory_infop pinfo;

   525       png_set_mem_fn(png_ptr, NULL, NULL, NULL);

   526       pinfo = (memory_infop)png_malloc(png_ptr,

   527          (png_uint_32)png_sizeof(*pinfo));

   528       pinfo->size = size;

   529       current_allocation += size;

   530       total_allocation += size;

   531       num_allocations ++;

   532       if (current_allocation > maximum_allocation)

   533          maximum_allocation = current_allocation;

   534       pinfo->pointer = (png_voidp)png_malloc(png_ptr, size);

   535       /* Restore malloc_fn and free_fn */

   536       png_set_mem_fn(png_ptr,

   537           png_voidp_NULL, (png_malloc_ptr)png_debug_malloc,

   538           (png_free_ptr)png_debug_free);

   539       if (size != 0 && pinfo->pointer == NULL)

   540       {

   541          current_allocation -= size;

   542          total_allocation -= size;

   543          png_error(png_ptr,

   544            "out of memory in pngtest->png_debug_malloc.");

   545       }

   546       pinfo->next = pinformation;

   547       pinformation = pinfo;

   548       /* Make sure the caller isn't assuming zeroed memory. */

   549       png_memset(pinfo->pointer, 0xdd, pinfo->size);

   550       if (verbose)

   551          printf("png_malloc %lu bytes at %x\n", (unsigned long)size,

   552             pinfo->pointer);

   553       return (png_voidp)(pinfo->pointer);

   554    }

   555 }

   556 

   557 /* Free a pointer.  It is removed from the list at the same time. */

   558 void

   559 png_debug_free(png_structp png_ptr, png_voidp ptr)

   560 {

   561    if (png_ptr == NULL)

   562       fprintf(STDERR, "NULL pointer to png_debug_free.\n");

   563    if (ptr == 0)

   564    {

   565 #if 0 /* This happens all the time. */

   566       fprintf(STDERR, "WARNING: freeing NULL pointer\n");

   567 #endif

   568       return;

   569    }

   570 

   571    /* Unlink the element from the list. */

   572    {

   573       memory_infop FAR *ppinfo = &pinformation;

   574       for (;;)

   575       {

   576          memory_infop pinfo = *ppinfo;

   577          if (pinfo->pointer == ptr)

   578          {

   579             *ppinfo = pinfo->next;

   580             current_allocation -= pinfo->size;

   581             if (current_allocation < 0)

   582                fprintf(STDERR, "Duplicate free of memory\n");

   583             /* We must free the list element too, but first kill

   584                the memory that is to be freed. */

   585             png_memset(ptr, 0x55, pinfo->size);

   586             png_free_default(png_ptr, pinfo);

   587             pinfo = NULL;

   588             break;

   589          }

   590          if (pinfo->next == NULL)

   591          {

   592             fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);

   593             break;

   594          }

   595          ppinfo = &pinfo->next;

   596       }

   597    }

   598 

   599    /* Finally free the data. */

   600    if (verbose)

   601       printf("Freeing %x\n", ptr);

   602    png_free_default(png_ptr, ptr);

   603    ptr = NULL;

   604 }

   605 #endif /* PNG_USER_MEM_SUPPORTED && PNG_DEBUG */

   606 /* END of code to test memory allocation/deallocation */

   607 

   608 

   609 /* Demonstration of user chunk support of the sTER and vpAg chunks */

   610 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

   611 

   612 /* (sTER is a public chunk not yet known by libpng.  vpAg is a private

   613 chunk used in ImageMagick to store "virtual page" size).  */

   614 

   615 static png_uint_32 user_chunk_data[4];

   616 

   617     /* 0: sTER mode + 1

   618      * 1: vpAg width

   619      * 2: vpAg height

   620      * 3: vpAg units

   621      */

   622 

   623 static int read_user_chunk_callback(png_struct *png_ptr,

   624    png_unknown_chunkp chunk)

   625 {

   626    png_uint_32

   627      *my_user_chunk_data;

   628 

   629    /* Return one of the following:

   630     *    return (-n);  chunk had an error

   631     *    return (0);  did not recognize

   632     *    return (n);  success

   633     *

   634     * The unknown chunk structure contains the chunk data:

   635     * png_byte name[5];

   636     * png_byte *data;

   637     * png_size_t size;

   638     *

   639     * Note that libpng has already taken care of the CRC handling.

   640     */

   641 

   642    if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */

   643        chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */

   644       {

   645          /* Found sTER chunk */

   646          if (chunk->size != 1)

   647             return (-1); /* Error return */

   648          if (chunk->data[0] != 0 && chunk->data[0] != 1)

   649             return (-1);  /* Invalid mode */

   650          my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);

   651          my_user_chunk_data[0]=chunk->data[0]+1;

   652          return (1);

   653       }

   654 

   655    if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */

   656        chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */

   657       return (0); /* Did not recognize */

   658 

   659    /* Found ImageMagick vpAg chunk */

   660 

   661    if (chunk->size != 9)

   662       return (-1); /* Error return */

   663 

   664    my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);

   665 

   666    my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);

   667    my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);

   668    my_user_chunk_data[3]=(png_uint_32)chunk->data[8];

   669 

   670    return (1);

   671 

   672 }

   673 #endif

   674 /* END of code to demonstrate user chunk support */

   675 

   676 /* Test one file */

   677 int

   678 test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)

   679 {

   680    static png_FILE_p fpin;

   681    static png_FILE_p fpout;  /* "static" prevents setjmp corruption */

   682    png_structp read_ptr;

   683    png_infop read_info_ptr, end_info_ptr;

   684 #ifdef PNG_WRITE_SUPPORTED

   685    png_structp write_ptr;

   686    png_infop write_info_ptr;

   687    png_infop write_end_info_ptr;

   688 #else

   689    png_structp write_ptr = NULL;

   690    png_infop write_info_ptr = NULL;

   691    png_infop write_end_info_ptr = NULL;

   692 #endif

   693    png_bytep row_buf;

   694    png_uint_32 y;

   695    png_uint_32 width, height;

   696    int num_pass, pass;

   697    int bit_depth, color_type;

   698 #ifdef PNG_SETJMP_SUPPORTED

   699 #ifdef USE_FAR_KEYWORD

   700    jmp_buf jmpbuf;

   701 #endif

   702 #endif

   703 

   704 #if defined(_WIN32_WCE)

   705    TCHAR path[MAX_PATH];

   706 #endif

   707    char inbuf[256], outbuf[256];

   708 

   709    row_buf = NULL;

   710 

   711 #if defined(_WIN32_WCE)

   712    MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);

   713    if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)

   714 #else

   715    if ((fpin = fopen(inname, "rb")) == NULL)

   716 #endif

   717    {

   718       fprintf(STDERR, "Could not find input file %s\n", inname);

   719       return (1);

   720    }

   721 

   722 #if defined(_WIN32_WCE)

   723    MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);

   724    if ((fpout = CreateFile(path, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL)) == INVALID_HANDLE_VALUE)

   725 #else

   726    if ((fpout = fopen(outname, "wb")) == NULL)

   727 #endif

   728    {

   729       fprintf(STDERR, "Could not open output file %s\n", outname);

   730       FCLOSE(fpin);

   731       return (1);

   732    }

   733 

   734    png_debug(0, "Allocating read and write structures");

   735 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG

   736    read_ptr =

   737       png_create_read_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,

   738       png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,

   739       (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);

   740 #else

   741    read_ptr =

   742       png_create_read_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,

   743       png_error_ptr_NULL, png_error_ptr_NULL);

   744 #endif

   745 #if defined(PNG_NO_STDIO)

   746    png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error,

   747        pngtest_warning);

   748 #endif

   749 

   750 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

   751    user_chunk_data[0] = 0;

   752    user_chunk_data[1] = 0;

   753    user_chunk_data[2] = 0;

   754    user_chunk_data[3] = 0;

   755    png_set_read_user_chunk_fn(read_ptr, user_chunk_data,

   756      read_user_chunk_callback);

   757 

   758 #endif

   759 #ifdef PNG_WRITE_SUPPORTED

   760 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG

   761    write_ptr =

   762       png_create_write_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,

   763       png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,

   764       (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);

   765 #else

   766    write_ptr =

   767       png_create_write_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,

   768       png_error_ptr_NULL, png_error_ptr_NULL);

   769 #endif

   770 #if defined(PNG_NO_STDIO)

   771    png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error,

   772        pngtest_warning);

   773 #endif

   774 #endif

   775    png_debug(0, "Allocating read_info, write_info and end_info structures");

   776    read_info_ptr = png_create_info_struct(read_ptr);

   777    end_info_ptr = png_create_info_struct(read_ptr);

   778 #ifdef PNG_WRITE_SUPPORTED

   779    write_info_ptr = png_create_info_struct(write_ptr);

   780    write_end_info_ptr = png_create_info_struct(write_ptr);

   781 #endif

   782 

   783 #ifdef PNG_SETJMP_SUPPORTED

   784    png_debug(0, "Setting jmpbuf for read struct");

   785 #ifdef USE_FAR_KEYWORD

   786    if (setjmp(jmpbuf))

   787 #else

   788    if (setjmp(png_jmpbuf(read_ptr)))

   789 #endif

   790    {

   791       fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);

   792       png_free(read_ptr, row_buf);

   793       row_buf = NULL;

   794       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);

   795 #ifdef PNG_WRITE_SUPPORTED

   796       png_destroy_info_struct(write_ptr, &write_end_info_ptr);

   797       png_destroy_write_struct(&write_ptr, &write_info_ptr);

   798 #endif

   799       FCLOSE(fpin);

   800       FCLOSE(fpout);

   801       return (1);

   802    }

   803 #ifdef USE_FAR_KEYWORD

   804    png_memcpy(png_jmpbuf(read_ptr), jmpbuf, png_sizeof(jmp_buf));

   805 #endif

   806 

   807 #ifdef PNG_WRITE_SUPPORTED

   808    png_debug(0, "Setting jmpbuf for write struct");

   809 #ifdef USE_FAR_KEYWORD

   810    if (setjmp(jmpbuf))

   811 #else

   812    if (setjmp(png_jmpbuf(write_ptr)))

   813 #endif

   814    {

   815       fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);

   816       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);

   817       png_destroy_info_struct(write_ptr, &write_end_info_ptr);

   818 #ifdef PNG_WRITE_SUPPORTED

   819       png_destroy_write_struct(&write_ptr, &write_info_ptr);

   820 #endif

   821       FCLOSE(fpin);

   822       FCLOSE(fpout);

   823       return (1);

   824    }

   825 #ifdef USE_FAR_KEYWORD

   826    png_memcpy(png_jmpbuf(write_ptr), jmpbuf, png_sizeof(jmp_buf));

   827 #endif

   828 #endif

   829 #endif

   830 

   831    png_debug(0, "Initializing input and output streams");

   832 #if !defined(PNG_NO_STDIO)

   833    png_init_io(read_ptr, fpin);

   834 #  ifdef PNG_WRITE_SUPPORTED

   835    png_init_io(write_ptr, fpout);

   836 #  endif

   837 #else

   838    png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);

   839 #  ifdef PNG_WRITE_SUPPORTED

   840    png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,

   841 #    if defined(PNG_WRITE_FLUSH_SUPPORTED)

   842       pngtest_flush);

   843 #    else

   844       NULL);

   845 #    endif

   846 #  endif

   847 #endif

   848    if (status_dots_requested == 1)

   849    {

   850 #ifdef PNG_WRITE_SUPPORTED

   851       png_set_write_status_fn(write_ptr, write_row_callback);

   852 #endif

   853       png_set_read_status_fn(read_ptr, read_row_callback);

   854    }

   855    else

   856    {

   857 #ifdef PNG_WRITE_SUPPORTED

   858       png_set_write_status_fn(write_ptr, png_write_status_ptr_NULL);

   859 #endif

   860       png_set_read_status_fn(read_ptr, png_read_status_ptr_NULL);

   861    }

   862 

   863 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)

   864    {

   865       int i;

   866       for (i = 0; i<256; i++)

   867          filters_used[i] = 0;

   868       png_set_read_user_transform_fn(read_ptr, count_filters);

   869    }

   870 #endif

   871 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

   872    zero_samples = 0;

   873    png_set_write_user_transform_fn(write_ptr, count_zero_samples);

   874 #endif

   875 

   876 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)

   877 #  ifndef PNG_HANDLE_CHUNK_ALWAYS

   878 #    define PNG_HANDLE_CHUNK_ALWAYS       3

   879 #  endif

   880    png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,

   881       png_bytep_NULL, 0);

   882 #endif

   883 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)

   884 #  ifndef PNG_HANDLE_CHUNK_IF_SAFE

   885 #    define PNG_HANDLE_CHUNK_IF_SAFE      2

   886 #  endif

   887    png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_IF_SAFE,

   888       png_bytep_NULL, 0);

   889 #endif

   890 

   891    png_debug(0, "Reading info struct");

   892    png_read_info(read_ptr, read_info_ptr);

   893 

   894    png_debug(0, "Transferring info struct");

   895    {

   896       int interlace_type, compression_type, filter_type;

   897 

   898       if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,

   899           &color_type, &interlace_type, &compression_type, &filter_type))

   900       {

   901          png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,

   902 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)

   903             color_type, interlace_type, compression_type, filter_type);

   904 #else

   905             color_type, PNG_INTERLACE_NONE, compression_type, filter_type);

   906 #endif

   907       }

   908    }

   909 #if defined(PNG_FIXED_POINT_SUPPORTED)

   910 #if defined(PNG_cHRM_SUPPORTED)

   911    {

   912       png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,

   913          blue_y;

   914       if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,

   915          &red_y, &green_x, &green_y, &blue_x, &blue_y))

   916       {

   917          png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,

   918             red_y, green_x, green_y, blue_x, blue_y);

   919       }

   920    }

   921 #endif

   922 #if defined(PNG_gAMA_SUPPORTED)

   923    {

   924       png_fixed_point gamma;

   925 

   926       if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))

   927          png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);

   928    }

   929 #endif

   930 #else /* Use floating point versions */

   931 #if defined(PNG_FLOATING_POINT_SUPPORTED)

   932 #if defined(PNG_cHRM_SUPPORTED)

   933    {

   934       double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,

   935          blue_y;

   936       if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,

   937          &red_y, &green_x, &green_y, &blue_x, &blue_y))

   938       {

   939          png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,

   940             red_y, green_x, green_y, blue_x, blue_y);

   941       }

   942    }

   943 #endif

   944 #if defined(PNG_gAMA_SUPPORTED)

   945    {

   946       double gamma;

   947 

   948       if (png_get_gAMA(read_ptr, read_info_ptr, &gamma))

   949          png_set_gAMA(write_ptr, write_info_ptr, gamma);

   950    }

   951 #endif

   952 #endif /* Floating point */

   953 #endif /* Fixed point */

   954 #if defined(PNG_iCCP_SUPPORTED)

   955    {

   956       png_charp name;

   957       png_charp profile;

   958       png_uint_32 proflen;

   959       int compression_type;

   960 

   961       if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,

   962                       &profile, &proflen))

   963       {

   964          png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,

   965                       profile, proflen);

   966       }

   967    }

   968 #endif

   969 #if defined(PNG_sRGB_SUPPORTED)

   970    {

   971       int intent;

   972 

   973       if (png_get_sRGB(read_ptr, read_info_ptr, &intent))

   974          png_set_sRGB(write_ptr, write_info_ptr, intent);

   975    }

   976 #endif

   977    {

   978       png_colorp palette;

   979       int num_palette;

   980 

   981       if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))

   982          png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);

   983    }

   984 #if defined(PNG_bKGD_SUPPORTED)

   985    {

   986       png_color_16p background;

   987 

   988       if (png_get_bKGD(read_ptr, read_info_ptr, &background))

   989       {

   990          png_set_bKGD(write_ptr, write_info_ptr, background);

   991       }

   992    }

   993 #endif

   994 #if defined(PNG_hIST_SUPPORTED)

   995    {

   996       png_uint_16p hist;

   997 

   998       if (png_get_hIST(read_ptr, read_info_ptr, &hist))

   999          png_set_hIST(write_ptr, write_info_ptr, hist);

  1000    }

  1001 #endif

  1002 #if defined(PNG_oFFs_SUPPORTED)

  1003    {

  1004       png_int_32 offset_x, offset_y;

  1005       int unit_type;

  1006 

  1007       if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,

  1008           &unit_type))

  1009       {

  1010          png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);

  1011       }

  1012    }

  1013 #endif

  1014 #if defined(PNG_pCAL_SUPPORTED)

  1015    {

  1016       png_charp purpose, units;

  1017       png_charpp params;

  1018       png_int_32 X0, X1;

  1019       int type, nparams;

  1020 

  1021       if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,

  1022          &nparams, &units, &params))

  1023       {

  1024          png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,

  1025             nparams, units, params);

  1026       }

  1027    }

  1028 #endif

  1029 #if defined(PNG_pHYs_SUPPORTED)

  1030    {

  1031       png_uint_32 res_x, res_y;

  1032       int unit_type;

  1033 

  1034       if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y, &unit_type))

  1035          png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);

  1036    }

  1037 #endif

  1038 #if defined(PNG_sBIT_SUPPORTED)

  1039    {

  1040       png_color_8p sig_bit;

  1041 

  1042       if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))

  1043          png_set_sBIT(write_ptr, write_info_ptr, sig_bit);

  1044    }

  1045 #endif

  1046 #if defined(PNG_sCAL_SUPPORTED)

  1047 #ifdef PNG_FLOATING_POINT_SUPPORTED

  1048    {

  1049       int unit;

  1050       double scal_width, scal_height;

  1051 

  1052       if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,

  1053          &scal_height))

  1054       {

  1055          png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);

  1056       }

  1057    }

  1058 #else

  1059 #ifdef PNG_FIXED_POINT_SUPPORTED

  1060    {

  1061       int unit;

  1062       png_charp scal_width, scal_height;

  1063 

  1064       if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,

  1065           &scal_height))

  1066       {

  1067          png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width, scal_height);

  1068       }

  1069    }

  1070 #endif

  1071 #endif

  1072 #endif

  1073 #if defined(PNG_TEXT_SUPPORTED)

  1074    {

  1075       png_textp text_ptr;

  1076       int num_text;

  1077 

  1078       if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)

  1079       {

  1080          png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text);

  1081          png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);

  1082       }

  1083    }

  1084 #endif

  1085 #if defined(PNG_tIME_SUPPORTED)

  1086    {

  1087       png_timep mod_time;

  1088 

  1089       if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))

  1090       {

  1091          png_set_tIME(write_ptr, write_info_ptr, mod_time);

  1092 #if defined(PNG_TIME_RFC1123_SUPPORTED)

  1093          /* We have to use png_memcpy instead of "=" because the string

  1094           * pointed to by png_convert_to_rfc1123() gets free'ed before

  1095           * we use it.

  1096           */

  1097          png_memcpy(tIME_string,

  1098                     png_convert_to_rfc1123(read_ptr, mod_time),

  1099                     png_sizeof(tIME_string));

  1100          tIME_string[png_sizeof(tIME_string) - 1] = '\0';

  1101          tIME_chunk_present++;

  1102 #endif /* PNG_TIME_RFC1123_SUPPORTED */

  1103       }

  1104    }

  1105 #endif

  1106 #if defined(PNG_tRNS_SUPPORTED)

  1107    {

  1108       png_bytep trans;

  1109       int num_trans;

  1110       png_color_16p trans_values;

  1111 

  1112       if (png_get_tRNS(read_ptr, read_info_ptr, &trans, &num_trans,

  1113          &trans_values))

  1114       {

  1115          int sample_max = (1 << read_info_ptr->bit_depth);

  1116          /* libpng doesn't reject a tRNS chunk with out-of-range samples */

  1117          if (!((read_info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&

  1118              (int)trans_values->gray > sample_max) ||

  1119              (read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&

  1120              ((int)trans_values->red > sample_max ||

  1121              (int)trans_values->green > sample_max ||

  1122              (int)trans_values->blue > sample_max))))

  1123             png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,

  1124                trans_values);

  1125       }

  1126    }

  1127 #endif

  1128 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)

  1129    {

  1130       png_unknown_chunkp unknowns;

  1131       int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,

  1132          &unknowns);

  1133       if (num_unknowns)

  1134       {