workbench/libs/png/pngtest.c

   1
   2 /* pngtest.c - a simple test program to test libpng
   3  *
   4  * Last changed in libpng 1.6.2 [April 25, 2013]
   5  * Copyright (c) 1998-2013 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 #define _POSIX_SOURCE 1
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 /* Defined so I can write to a file on gui/windowing platforms */
  41 /*  #define STDERR stderr  */
  42 #define STDERR stdout   /* For DOS */
  43
  44 #include "png.h"
  45
  46 /* Known chunks that exist in pngtest.png must be supported or pngtest will fail
  47  * simply as a result of re-ordering them.  This may be fixed in 1.7
  48  */
  49 #if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
  50    defined PNG_READ_bKGD_SUPPORTED &&\
  51    defined PNG_READ_cHRM_SUPPORTED &&\
  52    defined PNG_READ_gAMA_SUPPORTED &&\
  53    defined PNG_READ_oFFs_SUPPORTED &&\
  54    defined PNG_READ_pCAL_SUPPORTED &&\
  55    defined PNG_READ_pHYs_SUPPORTED &&\
  56    defined PNG_READ_sBIT_SUPPORTED &&\
  57    defined PNG_READ_sCAL_SUPPORTED &&\
  58    defined PNG_READ_sRGB_SUPPORTED &&\
  59    defined PNG_READ_tEXt_SUPPORTED &&\
  60    defined PNG_READ_tIME_SUPPORTED &&\
  61    defined PNG_READ_zTXt_SUPPORTED
  62
  63 #include "zlib.h"
  64 /* Copied from pngpriv.h but only used in error messages below. */
  65 #ifndef PNG_ZBUF_SIZE
  66 #  define PNG_ZBUF_SIZE 8192
  67 #endif
  68 #define FCLOSE(file) fclose(file)
  69
  70 #ifndef PNG_STDIO_SUPPORTED
  71 typedef FILE                * png_FILE_p;
  72 #endif
  73
  74 /* Makes pngtest verbose so we can find problems. */
  75 #ifndef PNG_DEBUG
  76 #  define PNG_DEBUG 0
  77 #endif
  78
  79 #if PNG_DEBUG > 1
  80 #  define pngtest_debug(m)        ((void)fprintf(stderr, m "\n"))
  81 #  define pngtest_debug1(m,p1)    ((void)fprintf(stderr, m "\n", p1))
  82 #  define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2))
  83 #else
  84 #  define pngtest_debug(m)        ((void)0)
  85 #  define pngtest_debug1(m,p1)    ((void)0)
  86 #  define pngtest_debug2(m,p1,p2) ((void)0)
  87 #endif
  88
  89 #if !PNG_DEBUG
  90 #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
  91 #endif
  92
  93 /* Turn on CPU timing
  94 #define PNGTEST_TIMING
  95 */
  96
  97 #ifndef PNG_FLOATING_POINT_SUPPORTED
  98 #undef PNGTEST_TIMING
  99 #endif
 100
 101 #ifdef PNGTEST_TIMING
 102 static float t_start, t_stop, t_decode, t_encode, t_misc;
 103 #include <time.h>
 104 #endif
 105
 106 #ifdef PNG_TIME_RFC1123_SUPPORTED
 107 #define PNG_tIME_STRING_LENGTH 29
 108 static int tIME_chunk_present = 0;
 109 static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
 110 #endif
 111
 112 static int verbose = 0;
 113 static int strict = 0;
 114 static int relaxed = 0;
 115 static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
 116 static int error_count = 0; /* count calls to png_error */
 117 static int warning_count = 0; /* count calls to png_warning */
 118
 119 #ifdef __TURBOC__
 120 #include <mem.h>
 121 #endif
 122
 123 /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
 124 #ifndef png_jmpbuf
 125 #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
 126 #endif
 127
 128 /* Defines for unknown chunk handling if required. */
 129 #ifndef PNG_HANDLE_CHUNK_ALWAYS
 130 #  define PNG_HANDLE_CHUNK_ALWAYS       3
 131 #endif
 132 #ifndef PNG_HANDLE_CHUNK_IF_SAFE
 133 #  define PNG_HANDLE_CHUNK_IF_SAFE      2
 134 #endif
 135
 136 /* Utility to save typing/errors, the argument must be a name */
 137 #define MEMZERO(var) ((void)memset(&var, 0, sizeof var))
 138
 139 /* Example of using row callbacks to make a simple progress meter */
 140 static int status_pass = 1;
 141 static int status_dots_requested = 0;
 142 static int status_dots = 1;
 143
 144 static void PNGCBAPI
 145 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 146 {
 147    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
 148       return;
 149
 150    if (status_pass != pass)
 151    {
 152       fprintf(stdout, "\n Pass %d: ", pass);
 153       status_pass = pass;
 154       status_dots = 31;
 155    }
 156
 157    status_dots--;
 158
 159    if (status_dots == 0)
 160    {
 161       fprintf(stdout, "\n         ");
 162       status_dots=30;
 163    }
 164
 165    fprintf(stdout, "r");
 166 }
 167
 168 #ifdef PNG_WRITE_SUPPORTED
 169 static void PNGCBAPI
 170 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 171 {
 172    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
 173       return;
 174
 175    fprintf(stdout, "w");
 176 }
 177 #endif
 178
 179
 180 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
 181 /* Example of using user transform callback (we don't transform anything,
 182  * but merely examine the row filters.  We set this to 256 rather than
 183  * 5 in case illegal filter values are present.)
 184  */
 185 static png_uint_32 filters_used[256];
 186 static void PNGCBAPI
 187 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 188 {
 189    if (png_ptr != NULL && row_info != NULL)
 190       ++filters_used[*(data - 1)];
 191 }
 192 #endif
 193
 194 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
 195 /* Example of using user transform callback (we don't transform anything,
 196  * but merely count the zero samples)
 197  */
 198
 199 static png_uint_32 zero_samples;
 200
 201 static void PNGCBAPI
 202 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 203 {
 204    png_bytep dp = data;
 205    if (png_ptr == NULL)
 206       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
 224        for (n = 0, nstop=row_info->width; n<nstop; n++)
 225        {
 226           if (row_info->bit_depth == 1)
 227           {
 228              if (((*dp << pos++ ) & 0x80) == 0)
 229                 zero_samples++;
 230
 231              if (pos == 8)
 232              {
 233                 pos = 0;
 234                 dp++;
 235              }
 236           }
 237
 238           if (row_info->bit_depth == 2)
 239           {
 240              if (((*dp << (pos+=2)) & 0xc0) == 0)
 241                 zero_samples++;
 242
 243              if (pos == 8)
 244              {
 245                 pos = 0;
 246                 dp++;
 247              }
 248           }
 249
 250           if (row_info->bit_depth == 4)
 251           {
 252              if (((*dp << (pos+=4)) & 0xf0) == 0)
 253                 zero_samples++;
 254
 255              if (pos == 8)
 256              {
 257                 pos = 0;
 258                 dp++;
 259              }
 260           }
 261
 262           if (row_info->bit_depth == 8)
 263              if (*dp++ == 0)
 264                 zero_samples++;
 265
 266           if (row_info->bit_depth == 16)
 267           {
 268              if ((*dp | *(dp+1)) == 0)
 269                 zero_samples++;
 270              dp+=2;
 271           }
 272        }
 273     }
 274     else /* Other color types */
 275     {
 276        png_uint_32 n, nstop;
 277        int channel;
 278        int color_channels = row_info->channels;
 279        if (row_info->color_type > 3)color_channels--;
 280
 281        for (n = 0, nstop=row_info->width; n<nstop; n++)
 282        {
 283           for (channel = 0; channel < color_channels; channel++)
 284           {
 285              if (row_info->bit_depth == 8)
 286                 if (*dp++ == 0)
 287                    zero_samples++;
 288
 289              if (row_info->bit_depth == 16)
 290              {
 291                 if ((*dp | *(dp+1)) == 0)
 292                    zero_samples++;
 293
 294                 dp+=2;
 295              }
 296           }
 297           if (row_info->color_type > 3)
 298           {
 299              dp++;
 300              if (row_info->bit_depth == 16)
 301                 dp++;
 302           }
 303        }
 304     }
 305 }
 306 #endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */
 307
 308 #ifndef PNG_STDIO_SUPPORTED
 309 /* START of code to validate stdio-free compilation */
 310 /* These copies of the default read/write functions come from pngrio.c and
 311  * pngwio.c.  They allow "don't include stdio" testing of the library.
 312  * This is the function that does the actual reading of data.  If you are
 313  * not reading from a standard C stream, you should create a replacement
 314  * read_data function and use it at run time with png_set_read_fn(), rather
 315  * than changing the library.
 316  */
 317
 318 #ifdef PNG_IO_STATE_SUPPORTED
 319 void
 320 pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
 321    png_uint_32 io_op);
 322 void
 323 pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
 324    png_uint_32 io_op)
 325 {
 326    png_uint_32 io_state = png_get_io_state(png_ptr);
 327    int err = 0;
 328
 329    /* Check if the current operation (reading / writing) is as expected. */
 330    if ((io_state & PNG_IO_MASK_OP) != io_op)
 331       png_error(png_ptr, "Incorrect operation in I/O state");
 332
 333    /* Check if the buffer size specific to the current location
 334     * (file signature / header / data / crc) is as expected.
 335     */
 336    switch (io_state & PNG_IO_MASK_LOC)
 337    {
 338    case PNG_IO_SIGNATURE:
 339       if (data_length > 8)
 340          err = 1;
 341       break;
 342    case PNG_IO_CHUNK_HDR:
 343       if (data_length != 8)
 344          err = 1;
 345       break;
 346    case PNG_IO_CHUNK_DATA:
 347       break;  /* no restrictions here */
 348    case PNG_IO_CHUNK_CRC:
 349       if (data_length != 4)
 350          err = 1;
 351       break;
 352    default:
 353       err = 1;  /* uninitialized */
 354    }
 355    if (err)
 356       png_error(png_ptr, "Bad I/O state or buffer size");
 357 }
 358 #endif
 359
 360 static void PNGCBAPI
 361 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 362 {
 363    png_size_t check = 0;
 364    png_voidp io_ptr;
 365
 366    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
 367     * instead of an int, which is what fread() actually returns.
 368     */
 369    io_ptr = png_get_io_ptr(png_ptr);
 370    if (io_ptr != NULL)
 371    {
 372       check = fread(data, 1, length, (png_FILE_p)io_ptr);
 373    }
 374
 375    if (check != length)
 376    {
 377       png_error(png_ptr, "Read Error");
 378    }
 379
 380 #ifdef PNG_IO_STATE_SUPPORTED
 381    pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
 382 #endif
 383 }
 384
 385 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 386 static void PNGCBAPI
 387 pngtest_flush(png_structp png_ptr)
 388 {
 389    /* Do nothing; fflush() is said to be just a waste of energy. */
 390    PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
 391 }
 392 #endif
 393
 394 /* This is the function that does the actual writing of data.  If you are
 395  * not writing to a standard C stream, you should create a replacement
 396  * write_data function and use it at run time with png_set_write_fn(), rather
 397  * than changing the library.
 398  */
 399 static void PNGCBAPI
 400 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 401 {
 402    png_size_t check;
 403
 404    check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
 405
 406    if (check != length)
 407    {
 408       png_error(png_ptr, "Write Error");
 409    }
 410
 411 #ifdef PNG_IO_STATE_SUPPORTED
 412    pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
 413 #endif
 414 }
 415 #endif /* !PNG_STDIO_SUPPORTED */
 416
 417 /* This function is called when there is a warning, but the library thinks
 418  * it can continue anyway.  Replacement functions don't have to do anything
 419  * here if you don't want to.  In the default configuration, png_ptr is
 420  * not used, but it is passed in case it may be useful.
 421  */
 422 typedef struct
 423 {
 424    PNG_CONST char *file_name;
 425 }  pngtest_error_parameters;
 426
 427 static void PNGCBAPI
 428 pngtest_warning(png_structp png_ptr, png_const_charp message)
 429 {
 430    PNG_CONST char *name = "UNKNOWN (ERROR!)";
 431    pngtest_error_parameters *test =
 432       (pngtest_error_parameters*)png_get_error_ptr(png_ptr);
 433
 434    ++warning_count;
 435
 436    if (test != NULL && test->file_name != NULL)
 437       name = test->file_name;
 438
 439    fprintf(STDERR, "%s: libpng warning: %s\n", name, message);
 440 }
 441
 442 /* This is the default error handling function.  Note that replacements for
 443  * this function MUST NOT RETURN, or the program will likely crash.  This
 444  * function is used by default, or if the program supplies NULL for the
 445  * error function pointer in png_set_error_fn().
 446  */
 447 static void PNGCBAPI
 448 pngtest_error(png_structp png_ptr, png_const_charp message)
 449 {
 450    ++error_count;
 451
 452    pngtest_warning(png_ptr, message);
 453    /* We can return because png_error calls the default handler, which is
 454     * actually OK in this case.
 455     */
 456 }
 457
 458 /* END of code to validate stdio-free compilation */
 459
 460 /* START of code to validate memory allocation and deallocation */
 461 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 462
 463 /* Allocate memory.  For reasonable files, size should never exceed
 464  * 64K.  However, zlib may allocate more then 64K if you don't tell
 465  * it not to.  See zconf.h and png.h for more information.  zlib does
 466  * need to allocate exactly 64K, so whatever you call here must
 467  * have the ability to do that.
 468  *
 469  * This piece of code can be compiled to validate max 64K allocations
 470  * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
 471  */
 472 typedef struct memory_information
 473 {
 474    png_alloc_size_t          size;
 475    png_voidp                 pointer;
 476    struct memory_information *next;
 477 } memory_information;
 478 typedef memory_information *memory_infop;
 479
 480 static memory_infop pinformation = NULL;
 481 static int current_allocation = 0;
 482 static int maximum_allocation = 0;
 483 static int total_allocation = 0;
 484 static int num_allocations = 0;
 485
 486 png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr,
 487     png_alloc_size_t size));
 488 void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
 489
 490 png_voidp
 491 PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
 492 {
 493
 494    /* png_malloc has already tested for NULL; png_create_struct calls
 495     * png_debug_malloc directly, with png_ptr == NULL which is OK
 496     */
 497
 498    if (size == 0)
 499       return (NULL);
 500
 501    /* This calls the library allocator twice, once to get the requested
 502       buffer and once to get a new free list entry. */
 503    {
 504       /* Disable malloc_fn and free_fn */
 505       memory_infop pinfo;
 506       png_set_mem_fn(png_ptr, NULL, NULL, NULL);
 507       pinfo = (memory_infop)png_malloc(png_ptr,
 508          (sizeof *pinfo));
 509       pinfo->size = size;
 510       current_allocation += size;
 511       total_allocation += size;
 512       num_allocations ++;
 513
 514       if (current_allocation > maximum_allocation)
 515          maximum_allocation = current_allocation;
 516
 517       pinfo->pointer = png_malloc(png_ptr, size);
 518       /* Restore malloc_fn and free_fn */
 519
 520       png_set_mem_fn(png_ptr,
 521           NULL, png_debug_malloc, png_debug_free);
 522
 523       if (size != 0 && pinfo->pointer == NULL)
 524       {
 525          current_allocation -= size;
 526          total_allocation -= size;
 527          png_error(png_ptr,
 528            "out of memory in pngtest->png_debug_malloc");
 529       }
 530
 531       pinfo->next = pinformation;
 532       pinformation = pinfo;
 533       /* Make sure the caller isn't assuming zeroed memory. */
 534       memset(pinfo->pointer, 0xdd, pinfo->size);
 535
 536       if (verbose)
 537          printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
 538             pinfo->pointer);
 539
 540       return (png_voidp)(pinfo->pointer);
 541    }
 542 }
 543
 544 /* Free a pointer.  It is removed from the list at the same time. */
 545 void PNGCBAPI
 546 png_debug_free(png_structp png_ptr, png_voidp ptr)
 547 {
 548    if (png_ptr == NULL)
 549       fprintf(STDERR, "NULL pointer to png_debug_free.\n");
 550
 551    if (ptr == 0)
 552    {
 553 #if 0 /* This happens all the time. */
 554       fprintf(STDERR, "WARNING: freeing NULL pointer\n");
 555 #endif
 556       return;
 557    }
 558
 559    /* Unlink the element from the list. */
 560    {
 561       memory_infop *ppinfo = &pinformation;
 562
 563       for (;;)
 564       {
 565          memory_infop pinfo = *ppinfo;
 566
 567          if (pinfo->pointer == ptr)
 568          {
 569             *ppinfo = pinfo->next;
 570             current_allocation -= pinfo->size;
 571             if (current_allocation < 0)
 572                fprintf(STDERR, "Duplicate free of memory\n");
 573             /* We must free the list element too, but first kill
 574                the memory that is to be freed. */
 575             memset(ptr, 0x55, pinfo->size);
 576             png_free_default(png_ptr, pinfo);
 577             pinfo = NULL;
 578             break;
 579          }
 580
 581          if (pinfo->next == NULL)
 582          {
 583             fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
 584             break;
 585          }
 586
 587          ppinfo = &pinfo->next;
 588       }
 589    }
 590
 591    /* Finally free the data. */
 592    if (verbose)
 593       printf("Freeing %p\n", ptr);
 594
 595    png_free_default(png_ptr, ptr);
 596    ptr = NULL;
 597 }
 598 #endif /* PNG_USER_MEM_SUPPORTED && PNG_DEBUG */
 599 /* END of code to test memory allocation/deallocation */
 600
 601
 602 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
 603 /* Demonstration of user chunk support of the sTER and vpAg chunks */
 604
 605 /* (sTER is a public chunk not yet known by libpng.  vpAg is a private
 606 chunk used in ImageMagick to store "virtual page" size).  */
 607
 608 static struct user_chunk_data
 609 {
 610    png_const_infop info_ptr;
 611    png_uint_32     vpAg_width, vpAg_height;
 612    png_byte        vpAg_units;
 613    png_byte        sTER_mode;
 614    int             location[2];
 615 }
 616 user_chunk_data;
 617
 618 /* Used for location and order; zero means nothing. */
 619 #define have_sTER   0x01
 620 #define have_vpAg   0x02
 621 #define before_PLTE 0x10
 622 #define before_IDAT 0x20
 623 #define after_IDAT  0x40
 624
 625 static void
 626 init_callback_info(png_const_infop info_ptr)
 627 {
 628    MEMZERO(user_chunk_data);
 629    user_chunk_data.info_ptr = info_ptr;
 630 }
 631
 632 static int
 633 set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
 634 {
 635    int location;
 636
 637    if ((data->location[0] & what) || (data->location[1] & what))
 638       return 0; /* already have one of these */
 639
 640    /* Find where we are (the code below zeros info_ptr to indicate that the
 641     * chunks before the first IDAT have been read.)
 642     */
 643    if (data->info_ptr == NULL) /* after IDAT */
 644       location = what | after_IDAT;
 645
 646    else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE))
 647       location = what | before_IDAT;
 648
 649    else
 650       location = what | before_PLTE;
 651
 652    if (data->location[0] == 0)
 653       data->location[0] = location;
 654
 655    else
 656       data->location[1] = location;
 657
 658    return 1; /* handled */
 659 }
 660
 661 static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr,
 662    png_unknown_chunkp chunk)
 663 {
 664    struct user_chunk_data *my_user_chunk_data =
 665       (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
 666
 667    if (my_user_chunk_data == NULL)
 668       png_error(png_ptr, "lost user chunk pointer");
 669
 670    /* Return one of the following:
 671     *    return (-n);  chunk had an error
 672     *    return (0);  did not recognize
 673     *    return (n);  success
 674     *
 675     * The unknown chunk structure contains the chunk data:
 676     * png_byte name[5];
 677     * png_byte *data;
 678     * png_size_t size;
 679     *
 680     * Note that libpng has already taken care of the CRC handling.
 681     */
 682
 683    if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
 684        chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
 685       {
 686          /* Found sTER chunk */
 687          if (chunk->size != 1)
 688             return (-1); /* Error return */
 689
 690          if (chunk->data[0] != 0 && chunk->data[0] != 1)
 691             return (-1);  /* Invalid mode */
 692
 693          if (set_location(png_ptr, my_user_chunk_data, have_sTER))
 694          {
 695             my_user_chunk_data->sTER_mode=chunk->data[0];
 696             return (1);
 697          }
 698
 699          else
 700             return (0); /* duplicate sTER - give it to libpng */
 701       }
 702
 703    if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
 704        chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
 705       return (0); /* Did not recognize */
 706
 707    /* Found ImageMagick vpAg chunk */
 708
 709    if (chunk->size != 9)
 710       return (-1); /* Error return */
 711
 712    if (!set_location(png_ptr, my_user_chunk_data, have_vpAg))
 713       return (0);  /* duplicate vpAg */
 714
 715    my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data);
 716    my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4);
 717    my_user_chunk_data->vpAg_units = chunk->data[8];
 718
 719    return (1);
 720 }
 721
 722 #ifdef PNG_WRITE_SUPPORTED
 723 static void
 724 write_sTER_chunk(png_structp write_ptr)
 725 {
 726    png_byte png_sTER[5] = {115,  84,  69,  82, '\0'};
 727
 728    if (verbose)
 729       fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
 730
 731    png_write_chunk(write_ptr, png_sTER, &user_chunk_data.sTER_mode, 1);
 732 }
 733
 734 static void
 735 write_vpAg_chunk(png_structp write_ptr)
 736 {
 737    png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
 738
 739    png_byte vpag_chunk_data[9];
 740
 741    if (verbose)
 742       fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
 743         (unsigned long)user_chunk_data.vpAg_width,
 744         (unsigned long)user_chunk_data.vpAg_height,
 745         user_chunk_data.vpAg_units);
 746
 747    png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
 748    png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
 749    vpag_chunk_data[8] = user_chunk_data.vpAg_units;
 750    png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
 751 }
 752
 753 static void
 754 write_chunks(png_structp write_ptr, int location)
 755 {
 756    int i;
 757
 758    /* Notice that this preserves the original chunk order, however chunks
 759     * intercepted by the callback will be written *after* chunks passed to
 760     * libpng.  This will actually reverse a pair of sTER chunks or a pair of
 761     * vpAg chunks, resulting in an error later.  This is not worth worrying
 762     * about - the chunks should not be duplicated!
 763     */
 764    for (i=0; i<2; ++i)
 765    {
 766       if (user_chunk_data.location[i] == (location | have_sTER))
 767          write_sTER_chunk(write_ptr);
 768
 769       else if (user_chunk_data.location[i] == (location | have_vpAg))
 770          write_vpAg_chunk(write_ptr);
 771    }
 772 }
 773 #endif /* PNG_WRITE_SUPPORTED */
 774 #else /* !PNG_READ_USER_CHUNKS_SUPPORTED */
 775 #  define write_chunks(pp,loc) ((void)0)
 776 #endif
 777 /* END of code to demonstrate user chunk support */
 778
 779 /* START of code to check that libpng has the required text support; this only
 780  * checks for the write support because if read support is missing the chunk
 781  * will simply not be reported back to pngtest.
 782  */
 783 #ifdef PNG_TEXT_SUPPORTED
 784 static void
 785 pngtest_check_text_support(png_const_structp png_ptr, png_textp text_ptr,
 786    int num_text)
 787 {
 788    while (num_text > 0)
 789    {
 790       switch (text_ptr[--num_text].compression)
 791       {
 792          case PNG_TEXT_COMPRESSION_NONE:
 793             break;
 794
 795          case PNG_TEXT_COMPRESSION_zTXt:
 796 #           ifndef PNG_WRITE_zTXt_SUPPORTED
 797                ++unsupported_chunks;
 798 #           endif
 799             break;
 800
 801          case PNG_ITXT_COMPRESSION_NONE:
 802          case PNG_ITXT_COMPRESSION_zTXt:
 803 #           ifndef PNG_WRITE_iTXt_SUPPORTED
 804                ++unsupported_chunks;
 805 #           endif
 806             break;
 807
 808          default:
 809             /* This is an error */
 810             png_error(png_ptr, "invalid text chunk compression field");
 811             break;
 812       }
 813    }
 814 }
 815 #endif
 816 /* END of code to check that libpng has the required text support */
 817
 818 /* Test one file */
 819 static int
 820 test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 821 {
 822    static png_FILE_p fpin;
 823    static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
 824    pngtest_error_parameters error_parameters;
 825    png_structp read_ptr;
 826    png_infop read_info_ptr, end_info_ptr;
 827 #ifdef PNG_WRITE_SUPPORTED
 828    png_structp write_ptr;
 829    png_infop write_info_ptr;
 830    png_infop write_end_info_ptr;
 831 #else
 832    png_structp write_ptr = NULL;
 833    png_infop write_info_ptr = NULL;
 834    png_infop write_end_info_ptr = NULL;
 835 #endif
 836    png_bytep row_buf;
 837    png_uint_32 y;
 838    png_uint_32 width, height;
 839    int num_pass, pass;
 840    int bit_depth, color_type;
 841
 842    row_buf = NULL;
 843    error_parameters.file_name = inname;
 844
 845    if ((fpin = fopen(inname, "rb")) == NULL)
 846    {
 847       fprintf(STDERR, "Could not find input file %s\n", inname);
 848       return (1);
 849    }
 850
 851    if ((fpout = fopen(outname, "wb")) == NULL)
 852    {
 853       fprintf(STDERR, "Could not open output file %s\n", outname);
 854       FCLOSE(fpin);
 855       return (1);
 856    }
 857
 858    pngtest_debug("Allocating read and write structures");
 859 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 860    read_ptr =
 861       png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
 862       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
 863 #else
 864    read_ptr =
 865       png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 866 #endif
 867    png_set_error_fn(read_ptr, &error_parameters, pngtest_error,
 868       pngtest_warning);
 869
 870 #ifdef PNG_WRITE_SUPPORTED
 871 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 872    write_ptr =
 873       png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
 874       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
 875 #else
 876    write_ptr =
 877       png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 878 #endif
 879    png_set_error_fn(write_ptr, &error_parameters, pngtest_error,
 880       pngtest_warning);
 881 #endif
 882    pngtest_debug("Allocating read_info, write_info and end_info structures");
 883    read_info_ptr = png_create_info_struct(read_ptr);
 884    end_info_ptr = png_create_info_struct(read_ptr);
 885 #ifdef PNG_WRITE_SUPPORTED
 886    write_info_ptr = png_create_info_struct(write_ptr);
 887    write_end_info_ptr = png_create_info_struct(write_ptr);
 888 #endif
 889
 890 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
 891    init_callback_info(read_info_ptr);
 892    png_set_read_user_chunk_fn(read_ptr, &user_chunk_data,
 893      read_user_chunk_callback);
 894 #endif
 895
 896 #ifdef PNG_SETJMP_SUPPORTED
 897    pngtest_debug("Setting jmpbuf for read struct");
 898    if (setjmp(png_jmpbuf(read_ptr)))
 899    {
 900       fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
 901       png_free(read_ptr, row_buf);
 902       row_buf = NULL;
 903       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
 904 #ifdef PNG_WRITE_SUPPORTED
 905       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
 906       png_destroy_write_struct(&write_ptr, &write_info_ptr);
 907 #endif
 908       FCLOSE(fpin);
 909       FCLOSE(fpout);
 910       return (1);
 911    }
 912
 913 #ifdef PNG_WRITE_SUPPORTED
 914    pngtest_debug("Setting jmpbuf for write struct");
 915
 916    if (setjmp(png_jmpbuf(write_ptr)))
 917    {
 918       fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
 919       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
 920       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
 921 #ifdef PNG_WRITE_SUPPORTED
 922       png_destroy_write_struct(&write_ptr, &write_info_ptr);
 923 #endif
 924       FCLOSE(fpin);
 925       FCLOSE(fpout);
 926       return (1);
 927    }
 928 #endif
 929 #endif
 930
 931    if (strict)
 932    {
 933       /* Treat png_benign_error() as errors on read */
 934       png_set_benign_errors(read_ptr, 0);
 935
 936 #ifdef PNG_WRITE_SUPPORTED
 937       /* Treat them as errors on write */
 938       png_set_benign_errors(write_ptr, 0);
 939 #endif
 940
 941       /* if strict is not set, then app warnings and errors are treated as
 942        * warnings in release builds, but not in unstable builds; this can be
 943        * changed with '--relaxed'.
 944        */
 945    }
 946
 947    else if (relaxed)
 948    {
 949       /* Allow application (pngtest) errors and warnings to pass */
 950       png_set_benign_errors(read_ptr, 1);
 951
 952 #ifdef PNG_WRITE_SUPPORTED
 953       png_set_benign_errors(write_ptr, 1);
 954 #endif
 955    }
 956
 957    pngtest_debug("Initializing input and output streams");
 958 #ifdef PNG_STDIO_SUPPORTED
 959    png_init_io(read_ptr, fpin);
 960 #  ifdef PNG_WRITE_SUPPORTED
 961    png_init_io(write_ptr, fpout);
 962 #  endif
 963 #else
 964    png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
 965 #  ifdef PNG_WRITE_SUPPORTED
 966    png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
 967 #    ifdef PNG_WRITE_FLUSH_SUPPORTED
 968       pngtest_flush);
 969 #    else
 970       NULL);
 971 #    endif
 972 #  endif
 973 #endif
 974
 975    if (status_dots_requested == 1)
 976    {
 977 #ifdef PNG_WRITE_SUPPORTED
 978       png_set_write_status_fn(write_ptr, write_row_callback);
 979 #endif
 980       png_set_read_status_fn(read_ptr, read_row_callback);
 981    }
 982
 983    else
 984    {
 985 #ifdef PNG_WRITE_SUPPORTED
 986       png_set_write_status_fn(write_ptr, NULL);
 987 #endif
 988       png_set_read_status_fn(read_ptr, NULL);
 989    }
 990
 991 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
 992    {
 993       int i;
 994
 995       for (i = 0; i<256; i++)
 996          filters_used[i] = 0;
 997
 998       png_set_read_user_transform_fn(read_ptr, count_filters);
 999    }
1000 #endif
1001 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1002    zero_samples = 0;
1003    png_set_write_user_transform_fn(write_ptr, count_zero_samples);
1004 #endif
1005
1006 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
1007    /* Preserve all the unknown chunks, if possible.  If this is disabled then,
1008     * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use
1009     * libpng to *save* the unknown chunks on read (because we can't switch the
1010     * save option on!)
1011     *
1012     * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all
1013     * unknown chunks and write will write them all.
1014     */
1015 #ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
1016    png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1017       NULL, 0);
1018 #endif
1019 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1020    png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1021       NULL, 0);
1022 #endif
1023 #endif
1024
1025    pngtest_debug("Reading info struct");
1026    png_read_info(read_ptr, read_info_ptr);
1027
1028 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1029    /* This is a bit of a hack; there is no obvious way in the callback function
1030     * to determine that the chunks before the first IDAT have been read, so
1031     * remove the info_ptr (which is only used to determine position relative to
1032     * PLTE) here to indicate that we are after the IDAT.
1033     */
1034    user_chunk_data.info_ptr = NULL;
1035 #endif
1036
1037    pngtest_debug("Transferring info struct");
1038    {
1039       int interlace_type, compression_type, filter_type;
1040
1041       if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
1042           &color_type, &interlace_type, &compression_type, &filter_type))
1043       {
1044          png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
1045 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1046             color_type, interlace_type, compression_type, filter_type);
1047 #else
1048             color_type, PNG_INTERLACE_NONE, compression_type, filter_type);
1049 #endif
1050       }
1051    }
1052 #ifdef PNG_FIXED_POINT_SUPPORTED
1053 #ifdef PNG_cHRM_SUPPORTED
1054    {
1055       png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
1056          blue_y;
1057
1058       if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
1059          &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y))
1060       {
1061          png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
1062             red_y, green_x, green_y, blue_x, blue_y);
1063       }
1064    }
1065 #endif
1066 #ifdef PNG_gAMA_SUPPORTED
1067    {
1068       png_fixed_point gamma;
1069
1070       if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
1071          png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
1072    }
1073 #endif
1074 #else /* Use floating point versions */
1075 #ifdef PNG_FLOATING_POINT_SUPPORTED
1076 #ifdef PNG_cHRM_SUPPORTED
1077    {
1078       double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
1079          blue_y;
1080
1081       if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
1082          &red_y, &green_x, &green_y, &blue_x, &blue_y))
1083       {
1084          png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
1085             red_y, green_x, green_y, blue_x, blue_y);
1086       }
1087    }
1088 #endif
1089 #ifdef PNG_gAMA_SUPPORTED
1090    {
1091       double gamma;
1092
1093       if (png_get_gAMA(read_ptr, read_info_ptr, &gamma))
1094          png_set_gAMA(write_ptr, write_info_ptr, gamma);
1095    }
1096 #endif
1097 #endif /* Floating point */
1098 #endif /* Fixed point */
1099 #ifdef PNG_iCCP_SUPPORTED
1100    {
1101       png_charp name;
1102       png_bytep profile;
1103       png_uint_32 proflen;
1104       int compression_type;
1105
1106       if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
1107                       &profile, &proflen))
1108       {
1109          png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
1110                       profile, proflen);
1111       }
1112    }
1113 #endif
1114 #ifdef PNG_sRGB_SUPPORTED
1115    {
1116       int intent;
1117
1118       if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
1119          png_set_sRGB(write_ptr, write_info_ptr, intent);
1120    }
1121 #endif
1122    {
1123       png_colorp palette;
1124       int num_palette;
1125
1126       if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
1127          png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
1128    }
1129 #ifdef PNG_bKGD_SUPPORTED
1130    {
1131       png_color_16p background;
1132
1133       if (png_get_bKGD(read_ptr, read_info_ptr, &background))
1134       {
1135          png_set_bKGD(write_ptr, write_info_ptr, background);
1136       }
1137    }
1138 #endif
1139 #ifdef PNG_hIST_SUPPORTED
1140    {
1141       png_uint_16p hist;
1142
1143       if (png_get_hIST(read_ptr, read_info_ptr, &hist))
1144          png_set_hIST(write_ptr, write_info_ptr, hist);
1145    }
1146 #endif
1147 #ifdef PNG_oFFs_SUPPORTED
1148    {
1149       png_int_32 offset_x, offset_y;
1150       int unit_type;
1151
1152       if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
1153           &unit_type))
1154       {
1155          png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
1156       }
1157    }
1158 #endif
1159 #ifdef PNG_pCAL_SUPPORTED
1160    {
1161       png_charp purpose, units;
1162       png_charpp params;
1163       png_int_32 X0, X1;
1164       int type, nparams;
1165
1166       if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
1167          &nparams, &units, &params))
1168       {
1169          png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
1170             nparams, units, params);
1171       }
1172    }
1173 #endif
1174 #ifdef PNG_pHYs_SUPPORTED
1175    {
1176       png_uint_32 res_x, res_y;
1177       int unit_type;
1178
1179       if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y, &unit_type))
1180          png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
1181    }
1182 #endif
1183 #ifdef PNG_sBIT_SUPPORTED
1184    {
1185       png_color_8p sig_bit;
1186
1187       if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
1188          png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
1189    }
1190 #endif
1191 #ifdef PNG_sCAL_SUPPORTED
1192 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1193    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
1194    {
1195       int unit;
1196       double scal_width, scal_height;
1197
1198       if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
1199          &scal_height))
1200       {
1201          png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
1202       }
1203    }
1204 #else
1205 #ifdef PNG_FIXED_POINT_SUPPORTED
1206    {
1207       int unit;
1208       png_charp scal_width, scal_height;
1209
1210       if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
1211           &scal_height))
1212       {
1213          png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
1214              scal_height);
1215       }
1216    }
1217 #endif
1218 #endif
1219 #endif
1220 #ifdef PNG_TEXT_SUPPORTED
1221    {
1222       png_textp text_ptr;
1223       int num_text;
1224
1225       if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
1226       {
1227          pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
1228
1229          pngtest_check_text_support(read_ptr, text_ptr, num_text);
1230
1231          if (verbose)
1232          {
1233             int i;
1234
1235             printf("\n");
1236             for (i=0; i<num_text; i++)
1237             {
1238                printf("   Text compression[%d]=%d\n",
1239                      i, text_ptr[i].compression);
1240             }
1241          }
1242
1243          png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
1244       }
1245    }
1246 #endif
1247 #ifdef PNG_tIME_SUPPORTED
1248    {
1249       png_timep mod_time;
1250
1251       if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))
1252       {
1253          png_set_tIME(write_ptr, write_info_ptr, mod_time);
1254 #ifdef PNG_TIME_RFC1123_SUPPORTED
1255          if (png_convert_to_rfc1123_buffer(tIME_string, mod_time))
1256             tIME_string[(sizeof tIME_string) - 1] = '\0';
1257
1258          else
1259          {
1260             strncpy(tIME_string, "*** invalid time ***", (sizeof tIME_string));
1261             tIME_string[(sizeof tIME_string) - 1] = '\0';
1262          }
1263
1264          tIME_chunk_present++;
1265 #endif /* PNG_TIME_RFC1123_SUPPORTED */
1266       }
1267    }
1268 #endif
1269 #ifdef PNG_tRNS_SUPPORTED
1270    {
1271       png_bytep trans_alpha;
1272       int num_trans;
1273       png_color_16p trans_color;
1274
1275       if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
1276          &trans_color))
1277       {
1278          int sample_max = (1 << bit_depth);
1279          /* libpng doesn't reject a tRNS chunk with out-of-range samples */
1280          if (!((color_type == PNG_COLOR_TYPE_GRAY &&
1281              (int)trans_color->gray > sample_max) ||
1282              (color_type == PNG_COLOR_TYPE_RGB &&
1283              ((int)trans_color->red > sample_max ||
1284              (int)trans_color->green > sample_max ||
1285              (int)trans_color->blue > sample_max))))
1286             png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
1287                trans_color);
1288       }
1289    }
1290 #endif
1291 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1292    {
1293       png_unknown_chunkp unknowns;
1294       int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
1295          &unknowns);
1296
1297       if (num_unknowns)
1298       {
1299          png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
1300            num_unknowns);
1301 #if PNG_LIBPNG_VER < 10600
1302          /* Copy the locations from the read_info_ptr.  The automatically
1303           * generated locations in write_end_info_ptr are wrong prior to 1.6.0
1304           * because they are reset from the write pointer (removed in 1.6.0).
1305           */
1306          {
1307             int i;
1308             for (i = 0; i < num_unknowns; i++)
1309               png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
1310                 unknowns[i].location);
1311          }
1312 #endif
1313       }
1314    }
1315 #endif
1316
1317 #ifdef PNG_WRITE_SUPPORTED
1318    pngtest_debug("Writing info struct");
1319
1320    /* Write the info in two steps so that if we write the 'unknown' chunks here
1321     * they go to the correct place.
1322     */
1323    png_write_info_before_PLTE(write_ptr, write_info_ptr);
1324
1325    write_chunks(write_ptr, before_PLTE); /* before PLTE */
1326
1327    png_write_info(write_ptr, write_info_ptr);
1328
1329    write_chunks(write_ptr, before_IDAT); /* after PLTE */
1330 #endif
1331
1332 #ifdef SINGLE_ROWBUF_ALLOC
1333    pngtest_debug("Allocating row buffer...");
1334    row_buf = (png_bytep)png_malloc(read_ptr,
1335       png_get_rowbytes(read_ptr, read_info_ptr));
1336
1337    pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
1338 #endif /* SINGLE_ROWBUF_ALLOC */
1339    pngtest_debug("Writing row data");
1340
1341 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1342   defined(PNG_WRITE_INTERLACING_SUPPORTED)
1343    num_pass = png_set_interlace_handling(read_ptr);
1344 #  ifdef PNG_WRITE_SUPPORTED
1345    png_set_interlace_handling(write_ptr);
1346 #  endif
1347 #else
1348    num_pass = 1;
1349 #endif
1350
1351 #ifdef PNGTEST_TIMING
1352    t_stop = (float)clock();
1353    t_misc += (t_stop - t_start);
1354    t_start = t_stop;
1355 #endif
1356    for (pass = 0; pass < num_pass; pass++)
1357    {
1358       pngtest_debug1("Writing row data for pass %d", pass);
1359       for (y = 0; y < height; y++)
1360       {
1361 #ifndef SINGLE_ROWBUF_ALLOC
1362          pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
1363          row_buf = (png_bytep)png_malloc(read_ptr,
1364             png_get_rowbytes(read_ptr, read_info_ptr));
1365
1366          pngtest_debug2("\t0x%08lx (%u bytes)", (unsigned long)row_buf,
1367             png_get_rowbytes(read_ptr, read_info_ptr));
1368
1369 #endif /* !SINGLE_ROWBUF_ALLOC */
1370          png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
1371
1372 #ifdef PNG_WRITE_SUPPORTED
1373 #ifdef PNGTEST_TIMING
1374          t_stop = (float)clock();
1375          t_decode += (t_stop - t_start);
1376          t_start = t_stop;
1377 #endif
1378          png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
1379 #ifdef PNGTEST_TIMING
1380          t_stop = (float)clock();
1381          t_encode += (t_stop - t_start);
1382          t_start = t_stop;
1383 #endif
1384 #endif /* PNG_WRITE_SUPPORTED */
1385
1386 #ifndef SINGLE_ROWBUF_ALLOC
1387          pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
1388          png_free(read_ptr, row_buf);
1389          row_buf = NULL;
1390 #endif /* !SINGLE_ROWBUF_ALLOC */
1391       }
1392    }
1393
1394 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1395    png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
1396 #endif
1397 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1398    png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
1399 #endif
1400
1401    pngtest_debug("Reading and writing end_info data");
1402
1403    png_read_end(read_ptr, end_info_ptr);
1404 #ifdef PNG_TEXT_SUPPORTED
1405    {
1406       png_textp text_ptr;
1407       int num_text;
1408
1409       if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
1410       {
1411          pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
1412
1413          pngtest_check_text_support(read_ptr, text_ptr, num_text);
1414
1415          if (verbose)
1416          {
1417             int i;
1418
1419             printf("\n");
1420             for (i=0; i<num_text; i++)
1421             {
1422                printf("   Text compression[%d]=%d\n",
1423                      i, text_ptr[i].compression);
1424             }
1425          }
1426
1427          png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
1428       }
1429    }
1430 #endif
1431 #ifdef PNG_tIME_SUPPORTED
1432    {
1433       png_timep mod_time;
1434
1435       if (png_get_tIME(read_ptr, end_info_ptr, &mod_time))
1436       {
1437          png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
1438 #ifdef PNG_TIME_RFC1123_SUPPORTED
1439          if (png_convert_to_rfc1123_buffer(tIME_string, mod_time))
1440             tIME_string[(sizeof tIME_string) - 1] = '\0';
1441
1442          else
1443          {
1444             strncpy(tIME_string, "*** invalid time ***", sizeof tIME_string);
1445             tIME_string[(sizeof tIME_string)-1] = '\0';
1446          }
1447
1448          tIME_chunk_present++;
1449 #endif /* PNG_TIME_RFC1123_SUPPORTED */
1450       }
1451    }
1452 #endif
1453 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1454    {
1455       png_unknown_chunkp unknowns;
1456       int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
1457          &unknowns);
1458
1459       if (num_unknowns)
1460       {
1461          png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
1462            num_unknowns);
1463 #if PNG_LIBPNG_VER < 10600
1464          /* Copy the locations from the read_info_ptr.  The automatically
1465           * generated locations in write_end_info_ptr are wrong prior to 1.6.0
1466           * because they are reset from the write pointer (removed in 1.6.0).
1467           */
1468          {
1469             int i;
1470             for (i = 0; i < num_unknowns; i++)
1471               png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
1472                 unknowns[i].location);
1473          }
1474 #endif
1475       }
1476    }
1477 #endif
1478
1479 #ifdef PNG_WRITE_SUPPORTED
1480 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
1481    /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
1482     * This is here just to make pngtest replicate the results from libpng
1483     * versions prior to 1.5.4, and to test this new API.
1484     */
1485    png_set_text_compression_strategy(write_ptr, Z_FILTERED);
1486 #endif
1487
1488    /* When the unknown vpAg/sTER chunks are written by pngtest the only way to
1489     * do it is to write them *before* calling png_write_end.  When unknown
1490     * chunks are written by libpng, however, they are written just before IEND.
1491     * There seems to be no way round this, however vpAg/sTER are not expected
1492     * after IDAT.
1493     */
1494    write_chunks(write_ptr, after_IDAT);
1495
1496    png_write_end(write_ptr, write_end_info_ptr);
1497 #endif
1498
1499 #ifdef PNG_EASY_ACCESS_SUPPORTED
1500    if (verbose)
1501    {
1502       png_uint_32 iwidth, iheight;
1503       iwidth = png_get_image_width(write_ptr, write_info_ptr);
1504       iheight = png_get_image_height(write_ptr, write_info_ptr);
1505       fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
1506          (unsigned long)iwidth, (unsigned long)iheight);
1507    }
1508 #endif
1509
1510    pngtest_debug("Destroying data structs");
1511 #ifdef SINGLE_ROWBUF_ALLOC
1512    pngtest_debug("destroying row_buf for read_ptr");
1513    png_free(read_ptr, row_buf);
1514    row_buf = NULL;
1515 #endif /* SINGLE_ROWBUF_ALLOC */
1516    pngtest_debug("destroying read_ptr, read_info_ptr, end_info_ptr");
1517    png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
1518 #ifdef PNG_WRITE_SUPPORTED
1519    pngtest_debug("destroying write_end_info_ptr");
1520    png_destroy_info_struct(write_ptr, &write_end_info_ptr);
1521    pngtest_debug("destroying write_ptr, write_info_ptr");
1522    png_destroy_write_struct(&write_ptr, &write_info_ptr);
1523 #endif
1524    pngtest_debug("Destruction complete.");
1525
1526    FCLOSE(fpin);
1527    FCLOSE(fpout);
1528
1529    /* Summarize any warnings or errors and in 'strict' mode fail the test.
1530     * Unsupported chunks can result in warnings, in that case ignore the strict
1531     * setting, otherwise fail the test on warnings as well as errors.
1532     */
1533    if (error_count > 0)
1534    {
1535       /* We don't really expect to get here because of the setjmp handling
1536        * above, but this is safe.
1537        */
1538       fprintf(STDERR, "\n  %s: %d libpng errors found (%d warnings)",
1539          inname, error_count, warning_count);
1540
1541       if (strict != 0)
1542          return (1);
1543    }
1544
1545 #  ifdef PNG_WRITE_SUPPORTED
1546       /* If there we no write support nothing was written! */
1547       else if (unsupported_chunks > 0)
1548       {
1549          fprintf(STDERR, "\n  %s: unsupported chunks (%d)%s",
1550             inname, unsupported_chunks, strict ? ": IGNORED --strict!" : "");
1551       }
1552 #  endif
1553
1554    else if (warning_count > 0)
1555    {
1556       fprintf(STDERR, "\n  %s: %d libpng warnings found",
1557          inname, warning_count);
1558
1559       if (strict != 0)
1560          return (1);
1561    }
1562
1563    pngtest_debug("Opening files for comparison");
1564    if ((fpin = fopen(inname, "rb")) == NULL)
1565    {
1566       fprintf(STDERR, "Could not find file %s\n", inname);
1567       return (1);
1568    }
1569
1570    if ((fpout = fopen(outname, "rb")) == NULL)
1571    {
1572       fprintf(STDERR, "Could not find file %s\n", outname);
1573       FCLOSE(fpin);
1574       return (1);
1575    }
1576
1577 #ifdef PNG_WRITE_SUPPORTED /* else nothing was written */
1578    {
1579       int wrote_question = 0;
1580
1581       for (;;)
1582       {
1583          png_size_t num_in, num_out;
1584          char inbuf[256], outbuf[256];
1585
1586
1587          num_in = fread(inbuf, 1, sizeof inbuf, fpin);
1588          num_out = fread(outbuf, 1, sizeof outbuf, fpout);
1589
1590          if (num_in != num_out)
1591          {
1592             fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
1593                     inname, outname);
1594
1595             if (wrote_question == 0 && unsupported_chunks == 0)
1596             {
1597                fprintf(STDERR,
1598          "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
1599                  inname, PNG_ZBUF_SIZE);
1600                fprintf(STDERR,
1601                  "\n   filtering heuristic (libpng default), compression");
1602                fprintf(STDERR,
1603                  " level (zlib default),\n   and zlib version (%s)?\n\n",
1604                  ZLIB_VERSION);
1605                wrote_question = 1;
1606             }
1607
1608             FCLOSE(fpin);
1609             FCLOSE(fpout);
1610
1611             if (strict != 0 && unsupported_chunks == 0)
1612               return (1);
1613
1614             else
1615               return (0);
1616          }
1617
1618          if (!num_in)
1619             break;
1620
1621          if (memcmp(inbuf, outbuf, num_in))
1622          {
1623             fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
1624                outname);
1625
1626             if (wrote_question == 0 && unsupported_chunks == 0)
1627             {
1628                fprintf(STDERR,
1629          "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
1630                     inname, PNG_ZBUF_SIZE);
1631                fprintf(STDERR,
1632                  "\n   filtering heuristic (libpng default), compression");
1633                fprintf(STDERR,
1634                  " level (zlib default),\n   and zlib version (%s)?\n\n",
1635                  ZLIB_VERSION);
1636                wrote_question = 1;
1637             }
1638
1639             FCLOSE(fpin);
1640             FCLOSE(fpout);
1641
1642             /* NOTE: the unsupported_chunks escape is permitted here because
1643              * unsupported text chunk compression will result in the compression
1644              * mode being changed (to NONE) yet, in the test case, the result
1645              * can be exactly the same size!
1646              */
1647             if (strict != 0 && unsupported_chunks == 0)
1648               return (1);
1649
1650             else
1651               return (0);
1652          }
1653       }
1654    }
1655 #endif /* PNG_WRITE_SUPPORTED */
1656
1657    FCLOSE(fpin);
1658    FCLOSE(fpout);
1659
1660    return (0);
1661 }
1662
1663 /* Input and output filenames */
1664 #ifdef RISCOS
1665 static PNG_CONST char *inname = "pngtest/png";
1666 static PNG_CONST char *outname = "pngout/png";
1667 #else
1668 static PNG_CONST char *inname = "pngtest.png";
1669 static PNG_CONST char *outname = "pngout.png";
1670 #endif
1671
1672 int
1673 main(int argc, char *argv[])
1674 {
1675    int multiple = 0;
1676    int ierror = 0;
1677
1678    fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
1679    fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
1680    fprintf(STDERR, "%s", png_get_copyright(NULL));
1681    /* Show the version of libpng used in building the library */
1682    fprintf(STDERR, " library (%lu):%s",
1683       (unsigned long)png_access_version_number(),
1684       png_get_header_version(NULL));
1685
1686    /* Show the version of libpng used in building the application */
1687    fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
1688       PNG_HEADER_VERSION_STRING);
1689
1690    /* Do some consistency checking on the memory allocation settings, I'm
1691     * not sure this matters, but it is nice to know, the first of these
1692     * tests should be impossible because of the way the macros are set
1693     * in pngconf.h
1694     */
1695 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
1696       fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
1697 #endif
1698    /* I think the following can happen. */
1699 #if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
1700       fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
1701 #endif
1702
1703    if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
1704    {
1705       fprintf(STDERR,
1706          "Warning: versions are different between png.h and png.c\n");
1707       fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
1708       fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
1709       ++ierror;
1710    }
1711
1712    if (argc > 1)
1713    {
1714       if (strcmp(argv[1], "-m") == 0)
1715       {
1716          multiple = 1;
1717          status_dots_requested = 0;
1718       }
1719
1720       else if (strcmp(argv[1], "-mv") == 0 ||
1721                strcmp(argv[1], "-vm") == 0 )
1722       {
1723          multiple = 1;
1724          verbose = 1;
1725          status_dots_requested = 1;
1726       }
1727
1728       else if (strcmp(argv[1], "-v") == 0)
1729       {
1730          verbose = 1;
1731          status_dots_requested = 1;
1732          inname = argv[2];
1733       }
1734
1735       else if (strcmp(argv[1], "--strict") == 0)
1736       {
1737          status_dots_requested = 0;
1738          verbose = 1;
1739          inname = argv[2];
1740          strict++;
1741          relaxed = 0;
1742       }
1743
1744       else if (strcmp(argv[1], "--relaxed") == 0)
1745       {
1746          status_dots_requested = 0;
1747          verbose = 1;
1748          inname = argv[2];
1749          strict = 0;
1750          relaxed++;
1751       }
1752
1753       else
1754       {
1755          inname = argv[1];
1756          status_dots_requested = 0;
1757       }
1758    }
1759
1760    if (!multiple && argc == 3 + verbose)
1761      outname = argv[2 + verbose];
1762
1763    if ((!multiple && argc > 3 + verbose) || (multiple && argc < 2))
1764    {
1765      fprintf(STDERR,
1766        "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
1767         argv[0], argv[0]);
1768      fprintf(STDERR,
1769        "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
1770      fprintf(STDERR,
1771        "  with -m %s is used as a temporary file\n", outname);
1772      exit(1);
1773    }
1774
1775    if (multiple)
1776    {
1777       int i;
1778 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1779       int allocation_now = current_allocation;
1780 #endif
1781       for (i=2; i<argc; ++i)
1782       {
1783          int kerror;
1784          fprintf(STDERR, "\n Testing %s:", argv[i]);
1785          kerror = test_one_file(argv[i], outname);
1786          if (kerror == 0)
1787          {
1788 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1789             int k;
1790 #endif
1791 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1792             fprintf(STDERR, "\n PASS (%lu zero samples)\n",
1793                (unsigned long)zero_samples);
1794 #else
1795             fprintf(STDERR, " PASS\n");
1796 #endif
1797 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1798             for (k = 0; k<256; k++)
1799                if (filters_used[k])
1800                   fprintf(STDERR, " Filter %d was used %lu times\n",
1801                      k, (unsigned long)filters_used[k]);
1802 #endif
1803 #ifdef PNG_TIME_RFC1123_SUPPORTED
1804          if (tIME_chunk_present != 0)
1805             fprintf(STDERR, " tIME = %s\n", tIME_string);
1806
1807          tIME_chunk_present = 0;
1808 #endif /* PNG_TIME_RFC1123_SUPPORTED */
1809          }
1810
1811          else
1812          {
1813             fprintf(STDERR, " FAIL\n");
1814             ierror += kerror;
1815          }
1816 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1817          if (allocation_now != current_allocation)
1818             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
1819                current_allocation - allocation_now);
1820
1821          if (current_allocation != 0)
1822          {
1823             memory_infop pinfo = pinformation;
1824
1825             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
1826                current_allocation);
1827
1828             while (pinfo != NULL)
1829             {
1830                fprintf(STDERR, " %lu bytes at %x\n",
1831                  (unsigned long)pinfo->size,
1832                  (unsigned int)pinfo->pointer);
1833                pinfo = pinfo->next;
1834             }
1835          }
1836 #endif
1837       }
1838 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1839          fprintf(STDERR, " Current memory allocation: %10d bytes\n",
1840             current_allocation);
1841          fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
1842             maximum_allocation);
1843          fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
1844             total_allocation);
1845          fprintf(STDERR, "     Number of allocations: %10d\n",
1846             num_allocations);
1847 #endif
1848    }
1849
1850    else
1851    {
1852       int i;
1853       for (i = 0; i<3; ++i)
1854       {
1855          int kerror;
1856 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1857          int allocation_now = current_allocation;
1858 #endif
1859          if (i == 1)
1860             status_dots_requested = 1;
1861
1862          else if (verbose == 0)
1863             status_dots_requested = 0;
1864
1865          if (i == 0 || verbose == 1 || ierror != 0)
1866             fprintf(STDERR, "\n Testing %s:", inname);
1867
1868          kerror = test_one_file(inname, outname);
1869
1870          if (kerror == 0)
1871          {
1872             if (verbose == 1 || i == 2)
1873             {
1874 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1875                 int k;
1876 #endif
1877 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1878                 fprintf(STDERR, "\n PASS (%lu zero samples)\n",
1879                    (unsigned long)zero_samples);
1880 #else
1881                 fprintf(STDERR, " PASS\n");
1882 #endif
1883 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1884                 for (k = 0; k<256; k++)
1885                    if (filters_used[k])
1886                       fprintf(STDERR, " Filter %d was used %lu times\n",
1887                          k, (unsigned long)filters_used[k]);
1888 #endif
1889 #ifdef PNG_TIME_RFC1123_SUPPORTED
1890              if (tIME_chunk_present != 0)
1891                 fprintf(STDERR, " tIME = %s\n", tIME_string);
1892 #endif /* PNG_TIME_RFC1123_SUPPORTED */
1893             }
1894          }
1895
1896          else
1897          {
1898             if (verbose == 0 && i != 2)
1899                fprintf(STDERR, "\n Testing %s:", inname);
1900
1901             fprintf(STDERR, " FAIL\n");
1902             ierror += kerror;
1903          }
1904 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1905          if (allocation_now != current_allocation)
1906              fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
1907                current_allocation - allocation_now);
1908
1909          if (current_allocation != 0)
1910          {
1911              memory_infop pinfo = pinformation;
1912
1913              fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
1914                 current_allocation);
1915
1916              while (pinfo != NULL)
1917              {
1918                 fprintf(STDERR, " %lu bytes at %x\n",
1919                    (unsigned long)pinfo->size, (unsigned int)pinfo->pointer);
1920                 pinfo = pinfo->next;
1921              }
1922           }
1923 #endif
1924        }
1925 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1926        fprintf(STDERR, " Current memory allocation: %10d bytes\n",
1927           current_allocation);
1928        fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
1929           maximum_allocation);
1930        fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
1931           total_allocation);
1932        fprintf(STDERR, "     Number of allocations: %10d\n",
1933             num_allocations);
1934 #endif
1935    }
1936
1937 #ifdef PNGTEST_TIMING
1938    t_stop = (float)clock();
1939    t_misc += (t_stop - t_start);
1940    t_start = t_stop;
1941    fprintf(STDERR, " CPU time used = %.3f seconds",
1942       (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
1943    fprintf(STDERR, " (decoding %.3f,\n",
1944       t_decode/(float)CLOCKS_PER_SEC);
1945    fprintf(STDERR, "        encoding %.3f ,",
1946       t_encode/(float)CLOCKS_PER_SEC);
1947    fprintf(STDERR, " other %.3f seconds)\n\n",
1948       t_misc/(float)CLOCKS_PER_SEC);
1949 #endif
1950
1951    if (ierror == 0)
1952       fprintf(STDERR, " libpng passes test\n");
1953
1954    else
1955       fprintf(STDERR, " libpng FAILS test\n");
1956
1957    return (int)(ierror != 0);
1958 }
1959 #else
1960 int
1961 main(void)
1962 {
1963    fprintf(STDERR,
1964       " test ignored because libpng was not built with read support\n");
1965    /* And skip this test */
1966    return 77;
1967 }
1968 #endif
1969
1970 /* Generate a compiler error if there is an old png.h in the search path. */
1971 typedef png_libpng_version_1_6_3 Your_png_h_is_not_version_1_6_3;