WDL/libpng/pngtest.c

   1
   2 /* pngtest.c - a simple test program to test libpng
   3  *
   4  * Last changed in libpng 1.6.19 [November 12, 2015]
   5  * Copyright (c) 1998-2015 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  * pngtest allocates a single row buffer for each row and overwrites it,
  50  * therefore if the write side doesn't support the writing of interlaced images
  51  * nothing can be done for an interlaced image (and the code below will fail
  52  * horribly trying to write extra data after writing garbage).
  53  */
  54 #if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
  55    defined PNG_READ_bKGD_SUPPORTED &&\
  56    defined PNG_READ_cHRM_SUPPORTED &&\
  57    defined PNG_READ_gAMA_SUPPORTED &&\
  58    defined PNG_READ_oFFs_SUPPORTED &&\
  59    defined PNG_READ_pCAL_SUPPORTED &&\
  60    defined PNG_READ_pHYs_SUPPORTED &&\
  61    defined PNG_READ_sBIT_SUPPORTED &&\
  62    defined PNG_READ_sCAL_SUPPORTED &&\
  63    defined PNG_READ_sPLT_SUPPORTED &&\
  64    defined PNG_READ_sRGB_SUPPORTED &&\
  65    defined PNG_READ_tEXt_SUPPORTED &&\
  66    defined PNG_READ_tIME_SUPPORTED &&\
  67    defined PNG_READ_zTXt_SUPPORTED &&\
  68    defined PNG_WRITE_INTERLACING_SUPPORTED
  69
  70 #ifdef PNG_ZLIB_HEADER
  71 #  include PNG_ZLIB_HEADER /* defined by pnglibconf.h from 1.7 */
  72 #else
  73 #  include "zlib.h"
  74 #endif
  75
  76 /* Copied from pngpriv.h but only used in error messages below. */
  77 #ifndef PNG_ZBUF_SIZE
  78 #  define PNG_ZBUF_SIZE 8192
  79 #endif
  80 #define FCLOSE(file) fclose(file)
  81
  82 #ifndef PNG_STDIO_SUPPORTED
  83 typedef FILE                * png_FILE_p;
  84 #endif
  85
  86 /* Makes pngtest verbose so we can find problems. */
  87 #ifndef PNG_DEBUG
  88 #  define PNG_DEBUG 0
  89 #endif
  90
  91 #if PNG_DEBUG > 1
  92 #  define pngtest_debug(m)        ((void)fprintf(stderr, m "\n"))
  93 #  define pngtest_debug1(m,p1)    ((void)fprintf(stderr, m "\n", p1))
  94 #  define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2))
  95 #else
  96 #  define pngtest_debug(m)        ((void)0)
  97 #  define pngtest_debug1(m,p1)    ((void)0)
  98 #  define pngtest_debug2(m,p1,p2) ((void)0)
  99 #endif
 100
 101 #if !PNG_DEBUG
 102 #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
 103 #endif
 104
 105 /* Turn on CPU timing
 106 #define PNGTEST_TIMING
 107 */
 108
 109 #ifndef PNG_FLOATING_POINT_SUPPORTED
 110 #undef PNGTEST_TIMING
 111 #endif
 112
 113 #ifdef PNGTEST_TIMING
 114 static float t_start, t_stop, t_decode, t_encode, t_misc;
 115 #include <time.h>
 116 #endif
 117
 118 #ifdef PNG_TIME_RFC1123_SUPPORTED
 119 #define PNG_tIME_STRING_LENGTH 29
 120 static int tIME_chunk_present = 0;
 121 static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
 122 #endif
 123
 124 static int verbose = 0;
 125 static int strict = 0;
 126 static int relaxed = 0;
 127 static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
 128 static int error_count = 0; /* count calls to png_error */
 129 static int warning_count = 0; /* count calls to png_warning */
 130
 131 /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
 132 #ifndef png_jmpbuf
 133 #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
 134 #endif
 135
 136 /* Defines for unknown chunk handling if required. */
 137 #ifndef PNG_HANDLE_CHUNK_ALWAYS
 138 #  define PNG_HANDLE_CHUNK_ALWAYS       3
 139 #endif
 140 #ifndef PNG_HANDLE_CHUNK_IF_SAFE
 141 #  define PNG_HANDLE_CHUNK_IF_SAFE      2
 142 #endif
 143
 144 /* Utility to save typing/errors, the argument must be a name */
 145 #define MEMZERO(var) ((void)memset(&var, 0, sizeof var))
 146
 147 /* Example of using row callbacks to make a simple progress meter */
 148 static int status_pass = 1;
 149 static int status_dots_requested = 0;
 150 static int status_dots = 1;
 151
 152 static void PNGCBAPI
 153 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 154 {
 155    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
 156       return;
 157
 158    if (status_pass != pass)
 159    {
 160       fprintf(stdout, "\n Pass %d: ", pass);
 161       status_pass = pass;
 162       status_dots = 31;
 163    }
 164
 165    status_dots--;
 166
 167    if (status_dots == 0)
 168    {
 169       fprintf(stdout, "\n         ");
 170       status_dots=30;
 171    }
 172
 173    fprintf(stdout, "r");
 174 }
 175
 176 #ifdef PNG_WRITE_SUPPORTED
 177 static void PNGCBAPI
 178 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 179 {
 180    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
 181       return;
 182
 183    fprintf(stdout, "w");
 184 }
 185 #endif
 186
 187
 188 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
 189 /* Example of using user transform callback (we don't transform anything,
 190  * but merely examine the row filters.  We set this to 256 rather than
 191  * 5 in case illegal filter values are present.)
 192  */
 193 static png_uint_32 filters_used[256];
 194 static void PNGCBAPI
 195 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 196 {
 197    if (png_ptr != NULL && row_info != NULL)
 198       ++filters_used[*(data - 1)];
 199 }
 200 #endif
 201
 202 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
 203 /* Example of using user transform callback (we don't transform anything,
 204  * but merely count the zero samples)
 205  */
 206
 207 static png_uint_32 zero_samples;
 208
 209 static void PNGCBAPI
 210 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 211 {
 212    png_bytep dp = data;
 213    if (png_ptr == NULL)
 214       return;
 215
 216    /* Contents of row_info:
 217     *  png_uint_32 width      width of row
 218     *  png_uint_32 rowbytes   number of bytes in row
 219     *  png_byte color_type    color type of pixels
 220     *  png_byte bit_depth     bit depth of samples
 221     *  png_byte channels      number of channels (1-4)
 222     *  png_byte pixel_depth   bits per pixel (depth*channels)
 223     */
 224
 225     /* Counts the number of zero samples (or zero pixels if color_type is 3 */
 226
 227     if (row_info->color_type == 0 || row_info->color_type == 3)
 228     {
 229        int pos = 0;
 230        png_uint_32 n, nstop;
 231
 232        for (n = 0, nstop=row_info->width; n<nstop; n++)
 233        {
 234           if (row_info->bit_depth == 1)
 235           {
 236              if (((*dp << pos++ ) & 0x80) == 0)
 237                 zero_samples++;
 238
 239              if (pos == 8)
 240              {
 241                 pos = 0;
 242                 dp++;
 243              }
 244           }
 245
 246           if (row_info->bit_depth == 2)
 247           {
 248              if (((*dp << (pos+=2)) & 0xc0) == 0)
 249                 zero_samples++;
 250
 251              if (pos == 8)
 252              {
 253                 pos = 0;
 254                 dp++;
 255              }
 256           }
 257
 258           if (row_info->bit_depth == 4)
 259           {
 260              if (((*dp << (pos+=4)) & 0xf0) == 0)
 261                 zero_samples++;
 262
 263              if (pos == 8)
 264              {
 265                 pos = 0;
 266                 dp++;
 267              }
 268           }
 269
 270           if (row_info->bit_depth == 8)
 271              if (*dp++ == 0)
 272                 zero_samples++;
 273
 274           if (row_info->bit_depth == 16)
 275           {
 276              if ((*dp | *(dp+1)) == 0)
 277                 zero_samples++;
 278              dp+=2;
 279           }
 280        }
 281     }
 282     else /* Other color types */
 283     {
 284        png_uint_32 n, nstop;
 285        int channel;
 286        int color_channels = row_info->channels;
 287        if (row_info->color_type > 3)
 288           color_channels--;
 289
 290        for (n = 0, nstop=row_info->width; n<nstop; n++)
 291        {
 292           for (channel = 0; channel < color_channels; channel++)
 293           {
 294              if (row_info->bit_depth == 8)
 295                 if (*dp++ == 0)
 296                    zero_samples++;
 297
 298              if (row_info->bit_depth == 16)
 299              {
 300                 if ((*dp | *(dp+1)) == 0)
 301                    zero_samples++;
 302
 303                 dp+=2;
 304              }
 305           }
 306           if (row_info->color_type > 3)
 307           {
 308              dp++;
 309              if (row_info->bit_depth == 16)
 310                 dp++;
 311           }
 312        }
 313     }
 314 }
 315 #endif /* WRITE_USER_TRANSFORM */
 316
 317 #ifndef PNG_STDIO_SUPPORTED
 318 /* START of code to validate stdio-free compilation */
 319 /* These copies of the default read/write functions come from pngrio.c and
 320  * pngwio.c.  They allow "don't include stdio" testing of the library.
 321  * This is the function that does the actual reading of data.  If you are
 322  * not reading from a standard C stream, you should create a replacement
 323  * read_data function and use it at run time with png_set_read_fn(), rather
 324  * than changing the library.
 325  */
 326
 327 #ifdef PNG_IO_STATE_SUPPORTED
 328 void
 329 pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
 330    png_uint_32 io_op);
 331 void
 332 pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
 333    png_uint_32 io_op)
 334 {
 335    png_uint_32 io_state = png_get_io_state(png_ptr);
 336    int err = 0;
 337
 338    /* Check if the current operation (reading / writing) is as expected. */
 339    if ((io_state & PNG_IO_MASK_OP) != io_op)
 340       png_error(png_ptr, "Incorrect operation in I/O state");
 341
 342    /* Check if the buffer size specific to the current location
 343     * (file signature / header / data / crc) is as expected.
 344     */
 345    switch (io_state & PNG_IO_MASK_LOC)
 346    {
 347    case PNG_IO_SIGNATURE:
 348       if (data_length > 8)
 349          err = 1;
 350       break;
 351    case PNG_IO_CHUNK_HDR:
 352       if (data_length != 8)
 353          err = 1;
 354       break;
 355    case PNG_IO_CHUNK_DATA:
 356       break;  /* no restrictions here */
 357    case PNG_IO_CHUNK_CRC:
 358       if (data_length != 4)
 359          err = 1;
 360       break;
 361    default:
 362       err = 1;  /* uninitialized */
 363    }
 364    if (err != 0)
 365       png_error(png_ptr, "Bad I/O state or buffer size");
 366 }
 367 #endif
 368
 369 static void PNGCBAPI
 370 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 371 {
 372    png_size_t check = 0;
 373    png_voidp io_ptr;
 374
 375    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
 376     * instead of an int, which is what fread() actually returns.
 377     */
 378    io_ptr = png_get_io_ptr(png_ptr);
 379    if (io_ptr != NULL)
 380    {
 381       check = fread(data, 1, length, (png_FILE_p)io_ptr);
 382    }
 383
 384    if (check != length)
 385    {
 386       png_error(png_ptr, "Read Error");
 387    }
 388
 389 #ifdef PNG_IO_STATE_SUPPORTED
 390    pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
 391 #endif
 392 }
 393
 394 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 395 static void PNGCBAPI
 396 pngtest_flush(png_structp png_ptr)
 397 {
 398    /* Do nothing; fflush() is said to be just a waste of energy. */
 399    PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
 400 }
 401 #endif
 402
 403 /* This is the function that does the actual writing of data.  If you are
 404  * not writing to a standard C stream, you should create a replacement
 405  * write_data function and use it at run time with png_set_write_fn(), rather
 406  * than changing the library.
 407  */
 408 static void PNGCBAPI
 409 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 410 {
 411    png_size_t check;
 412
 413    check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
 414
 415    if (check != length)
 416    {
 417       png_error(png_ptr, "Write Error");
 418    }
 419
 420 #ifdef PNG_IO_STATE_SUPPORTED
 421    pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
 422 #endif
 423 }
 424 #endif /* !STDIO */
 425
 426 /* This function is called when there is a warning, but the library thinks
 427  * it can continue anyway.  Replacement functions don't have to do anything
 428  * here if you don't want to.  In the default configuration, png_ptr is
 429  * not used, but it is passed in case it may be useful.
 430  */
 431 typedef struct
 432 {
 433    PNG_CONST char *file_name;
 434 }  pngtest_error_parameters;
 435
 436 static void PNGCBAPI
 437 pngtest_warning(png_structp png_ptr, png_const_charp message)
 438 {
 439    PNG_CONST char *name = "UNKNOWN (ERROR!)";
 440    pngtest_error_parameters *test =
 441       (pngtest_error_parameters*)png_get_error_ptr(png_ptr);
 442
 443    ++warning_count;
 444
 445    if (test != NULL && test->file_name != NULL)
 446       name = test->file_name;
 447
 448    fprintf(STDERR, "%s: libpng warning: %s\n", name, message);
 449 }
 450
 451 /* This is the default error handling function.  Note that replacements for
 452  * this function MUST NOT RETURN, or the program will likely crash.  This
 453  * function is used by default, or if the program supplies NULL for the
 454  * error function pointer in png_set_error_fn().
 455  */
 456 static void PNGCBAPI
 457 pngtest_error(png_structp png_ptr, png_const_charp message)
 458 {
 459    ++error_count;
 460
 461    pngtest_warning(png_ptr, message);
 462    /* We can return because png_error calls the default handler, which is
 463     * actually OK in this case.
 464     */
 465 }
 466
 467 /* END of code to validate stdio-free compilation */
 468
 469 /* START of code to validate memory allocation and deallocation */
 470 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 471
 472 /* Allocate memory.  For reasonable files, size should never exceed
 473  * 64K.  However, zlib may allocate more than 64K if you don't tell
 474  * it not to.  See zconf.h and png.h for more information.  zlib does
 475  * need to allocate exactly 64K, so whatever you call here must
 476  * have the ability to do that.
 477  *
 478  * This piece of code can be compiled to validate max 64K allocations
 479  * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
 480  */
 481 typedef struct memory_information
 482 {
 483    png_alloc_size_t          size;
 484    png_voidp                 pointer;
 485    struct memory_information *next;
 486 } memory_information;
 487 typedef memory_information *memory_infop;
 488
 489 static memory_infop pinformation = NULL;
 490 static int current_allocation = 0;
 491 static int maximum_allocation = 0;
 492 static int total_allocation = 0;
 493 static int num_allocations = 0;
 494
 495 png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr,
 496     png_alloc_size_t size));
 497 void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
 498
 499 png_voidp
 500 PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
 501 {
 502
 503    /* png_malloc has already tested for NULL; png_create_struct calls
 504     * png_debug_malloc directly, with png_ptr == NULL which is OK
 505     */
 506
 507    if (size == 0)
 508       return (NULL);
 509
 510    /* This calls the library allocator twice, once to get the requested
 511       buffer and once to get a new free list entry. */
 512    {
 513       /* Disable malloc_fn and free_fn */
 514       memory_infop pinfo;
 515       png_set_mem_fn(png_ptr, NULL, NULL, NULL);
 516       pinfo = (memory_infop)png_malloc(png_ptr,
 517          (sizeof *pinfo));
 518       pinfo->size = size;
 519       current_allocation += size;
 520       total_allocation += size;
 521       num_allocations ++;
 522
 523       if (current_allocation > maximum_allocation)
 524          maximum_allocation = current_allocation;
 525
 526       pinfo->pointer = png_malloc(png_ptr, size);
 527       /* Restore malloc_fn and free_fn */
 528
 529       png_set_mem_fn(png_ptr,
 530           NULL, png_debug_malloc, png_debug_free);
 531
 532       if (size != 0 && pinfo->pointer == NULL)
 533       {
 534          current_allocation -= size;
 535          total_allocation -= size;
 536          png_error(png_ptr,
 537            "out of memory in pngtest->png_debug_malloc");
 538       }
 539
 540       pinfo->next = pinformation;
 541       pinformation = pinfo;
 542       /* Make sure the caller isn't assuming zeroed memory. */
 543       memset(pinfo->pointer, 0xdd, pinfo->size);
 544
 545       if (verbose != 0)
 546          printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
 547             pinfo->pointer);
 548
 549       return (png_voidp)(pinfo->pointer);
 550    }
 551 }
 552
 553 /* Free a pointer.  It is removed from the list at the same time. */
 554 void PNGCBAPI
 555 png_debug_free(png_structp png_ptr, png_voidp ptr)
 556 {
 557    if (png_ptr == NULL)
 558       fprintf(STDERR, "NULL pointer to png_debug_free.\n");
 559
 560    if (ptr == 0)
 561    {
 562 #if 0 /* This happens all the time. */
 563       fprintf(STDERR, "WARNING: freeing NULL pointer\n");
 564 #endif
 565       return;
 566    }
 567
 568    /* Unlink the element from the list. */
 569    if (pinformation != NULL)
 570    {
 571       memory_infop *ppinfo = &pinformation;
 572
 573       for (;;)
 574       {
 575          memory_infop pinfo = *ppinfo;
 576
 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             memset(ptr, 0x55, pinfo->size);
 586             free(pinfo);
 587             pinfo = NULL;
 588             break;
 589          }
 590
 591          if (pinfo->next == NULL)
 592          {
 593             fprintf(STDERR, "Pointer %p not found\n", ptr);
 594             break;
 595          }
 596
 597          ppinfo = &pinfo->next;
 598       }
 599    }
 600
 601    /* Finally free the data. */
 602    if (verbose != 0)
 603       printf("Freeing %p\n", ptr);
 604
 605    if (ptr != NULL)
 606       free(ptr);
 607    ptr = NULL;
 608 }
 609 #endif /* USER_MEM && DEBUG */
 610 /* END of code to test memory allocation/deallocation */
 611
 612
 613 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
 614 /* Demonstration of user chunk support of the sTER and vpAg chunks */
 615
 616 /* (sTER is a public chunk not yet known by libpng.  vpAg is a private
 617 chunk used in ImageMagick to store "virtual page" size).  */
 618
 619 static struct user_chunk_data
 620 {
 621    png_const_infop info_ptr;
 622    png_uint_32     vpAg_width, vpAg_height;
 623    png_byte        vpAg_units;
 624    png_byte        sTER_mode;
 625    int             location[2];
 626 }
 627 user_chunk_data;
 628
 629 /* Used for location and order; zero means nothing. */
 630 #define have_sTER   0x01
 631 #define have_vpAg   0x02
 632 #define before_PLTE 0x10
 633 #define before_IDAT 0x20
 634 #define after_IDAT  0x40
 635
 636 static void
 637 init_callback_info(png_const_infop info_ptr)
 638 {
 639    MEMZERO(user_chunk_data);
 640    user_chunk_data.info_ptr = info_ptr;
 641 }
 642
 643 static int
 644 set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
 645 {
 646    int location;
 647
 648    if ((data->location[0] & what) != 0 || (data->location[1] & what) != 0)
 649       return 0; /* already have one of these */
 650
 651    /* Find where we are (the code below zeroes info_ptr to indicate that the
 652     * chunks before the first IDAT have been read.)
 653     */
 654    if (data->info_ptr == NULL) /* after IDAT */
 655       location = what | after_IDAT;
 656
 657    else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE) != 0)
 658       location = what | before_IDAT;
 659
 660    else
 661       location = what | before_PLTE;
 662
 663    if (data->location[0] == 0)
 664       data->location[0] = location;
 665
 666    else
 667       data->location[1] = location;
 668
 669    return 1; /* handled */
 670 }
 671
 672 static int PNGCBAPI
 673 read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk)
 674 {
 675    struct user_chunk_data *my_user_chunk_data =
 676       (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
 677
 678    if (my_user_chunk_data == NULL)
 679       png_error(png_ptr, "lost user chunk pointer");
 680
 681    /* Return one of the following:
 682     *    return (-n);  chunk had an error
 683     *    return (0);  did not recognize
 684     *    return (n);  success
 685     *
 686     * The unknown chunk structure contains the chunk data:
 687     * png_byte name[5];
 688     * png_byte *data;
 689     * png_size_t size;
 690     *
 691     * Note that libpng has already taken care of the CRC handling.
 692     */
 693
 694    if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
 695        chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
 696       {
 697          /* Found sTER chunk */
 698          if (chunk->size != 1)
 699             return (-1); /* Error return */
 700
 701          if (chunk->data[0] != 0 && chunk->data[0] != 1)
 702             return (-1);  /* Invalid mode */
 703
 704          if (set_location(png_ptr, my_user_chunk_data, have_sTER) != 0)
 705          {
 706             my_user_chunk_data->sTER_mode=chunk->data[0];
 707             return (1);
 708          }
 709
 710          else
 711             return (0); /* duplicate sTER - give it to libpng */
 712       }
 713
 714    if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
 715        chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
 716       return (0); /* Did not recognize */
 717
 718    /* Found ImageMagick vpAg chunk */
 719
 720    if (chunk->size != 9)
 721       return (-1); /* Error return */
 722
 723    if (set_location(png_ptr, my_user_chunk_data, have_vpAg) == 0)
 724       return (0);  /* duplicate vpAg */
 725
 726    my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data);
 727    my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4);
 728    my_user_chunk_data->vpAg_units = chunk->data[8];
 729
 730    return (1);
 731 }
 732
 733 #ifdef PNG_WRITE_SUPPORTED
 734 static void
 735 write_sTER_chunk(png_structp write_ptr)
 736 {
 737    png_byte sTER[5] = {115,  84,  69,  82, '\0'};
 738
 739    if (verbose != 0)
 740       fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
 741
 742    png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
 743 }
 744
 745 static void
 746 write_vpAg_chunk(png_structp write_ptr)
 747 {
 748    png_byte vpAg[5] = {118, 112,  65, 103, '\0'};
 749
 750    png_byte vpag_chunk_data[9];
 751
 752    if (verbose != 0)
 753       fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
 754         (unsigned long)user_chunk_data.vpAg_width,
 755         (unsigned long)user_chunk_data.vpAg_height,
 756         user_chunk_data.vpAg_units);
 757
 758    png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
 759    png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
 760    vpag_chunk_data[8] = user_chunk_data.vpAg_units;
 761    png_write_chunk(write_ptr, vpAg, vpag_chunk_data, 9);
 762 }
 763
 764 static void
 765 write_chunks(png_structp write_ptr, int location)
 766 {
 767    int i;
 768
 769    /* Notice that this preserves the original chunk order, however chunks
 770     * intercepted by the callback will be written *after* chunks passed to
 771     * libpng.  This will actually reverse a pair of sTER chunks or a pair of
 772     * vpAg chunks, resulting in an error later.  This is not worth worrying
 773     * about - the chunks should not be duplicated!
 774     */
 775    for (i=0; i<2; ++i)
 776    {
 777       if (user_chunk_data.location[i] == (location | have_sTER))
 778          write_sTER_chunk(write_ptr);
 779
 780       else if (user_chunk_data.location[i] == (location | have_vpAg))
 781          write_vpAg_chunk(write_ptr);
 782    }
 783 }
 784 #endif /* WRITE */
 785 #else /* !READ_USER_CHUNKS */
 786 #  define write_chunks(pp,loc) ((void)0)
 787 #endif
 788 /* END of code to demonstrate user chunk support */
 789
 790 /* START of code to check that libpng has the required text support; this only
 791  * checks for the write support because if read support is missing the chunk
 792  * will simply not be reported back to pngtest.
 793  */
 794 #ifdef PNG_TEXT_SUPPORTED
 795 static void
 796 pngtest_check_text_support(png_const_structp png_ptr, png_textp text_ptr,
 797    int num_text)
 798 {
 799    while (num_text > 0)
 800    {
 801       switch (text_ptr[--num_text].compression)
 802       {
 803          case PNG_TEXT_COMPRESSION_NONE:
 804             break;
 805
 806          case PNG_TEXT_COMPRESSION_zTXt:
 807 #           ifndef PNG_WRITE_zTXt_SUPPORTED
 808                ++unsupported_chunks;
 809 #           endif
 810             break;
 811
 812          case PNG_ITXT_COMPRESSION_NONE:
 813          case PNG_ITXT_COMPRESSION_zTXt:
 814 #           ifndef PNG_WRITE_iTXt_SUPPORTED
 815                ++unsupported_chunks;
 816 #           endif
 817             break;
 818
 819          default:
 820             /* This is an error */
 821             png_error(png_ptr, "invalid text chunk compression field");
 822             break;
 823       }
 824    }
 825 }
 826 #endif
 827 /* END of code to check that libpng has the required text support */
 828
 829 /* Test one file */
 830 static int
 831 test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 832 {
 833    static png_FILE_p fpin;
 834    static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
 835    pngtest_error_parameters error_parameters;
 836    png_structp read_ptr;
 837    png_infop read_info_ptr, end_info_ptr;
 838 #ifdef PNG_WRITE_SUPPORTED
 839    png_structp write_ptr;
 840    png_infop write_info_ptr;
 841    png_infop write_end_info_ptr;
 842    int interlace_preserved = 1;
 843 #else
 844    png_structp write_ptr = NULL;
 845    png_infop write_info_ptr = NULL;
 846    png_infop write_end_info_ptr = NULL;
 847 #endif
 848    png_bytep row_buf;
 849    png_uint_32 y;
 850    png_uint_32 width, height;
 851    int num_pass = 1, pass;
 852    int bit_depth, color_type;
 853
 854    row_buf = NULL;
 855    error_parameters.file_name = inname;
 856
 857    if ((fpin = fopen(inname, "rb")) == NULL)
 858    {
 859       fprintf(STDERR, "Could not find input file %s\n", inname);
 860       return (1);
 861    }
 862
 863    if ((fpout = fopen(outname, "wb")) == NULL)
 864    {
 865       fprintf(STDERR, "Could not open output file %s\n", outname);
 866       FCLOSE(fpin);
 867       return (1);
 868    }
 869
 870    pngtest_debug("Allocating read and write structures");
 871 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 872    read_ptr =
 873       png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
 874       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
 875 #else
 876    read_ptr =
 877       png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 878 #endif
 879    png_set_error_fn(read_ptr, &error_parameters, pngtest_error,
 880       pngtest_warning);
 881
 882 #ifdef PNG_WRITE_SUPPORTED
 883 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 884    write_ptr =
 885       png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
 886       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
 887 #else
 888    write_ptr =
 889       png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 890 #endif
 891    png_set_error_fn(write_ptr, &error_parameters, pngtest_error,
 892       pngtest_warning);
 893 #endif
 894    pngtest_debug("Allocating read_info, write_info and end_info structures");
 895    read_info_ptr = png_create_info_struct(read_ptr);
 896    end_info_ptr = png_create_info_struct(read_ptr);
 897 #ifdef PNG_WRITE_SUPPORTED
 898    write_info_ptr = png_create_info_struct(write_ptr);
 899    write_end_info_ptr = png_create_info_struct(write_ptr);
 900 #endif
 901
 902 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
 903    init_callback_info(read_info_ptr);
 904    png_set_read_user_chunk_fn(read_ptr, &user_chunk_data,
 905      read_user_chunk_callback);
 906 #endif
 907
 908 #ifdef PNG_SETJMP_SUPPORTED
 909    pngtest_debug("Setting jmpbuf for read struct");
 910    if (setjmp(png_jmpbuf(read_ptr)))
 911    {
 912       fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
 913       png_free(read_ptr, row_buf);
 914       row_buf = NULL;
 915       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
 916 #ifdef PNG_WRITE_SUPPORTED
 917       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
 918       png_destroy_write_struct(&write_ptr, &write_info_ptr);
 919 #endif
 920       FCLOSE(fpin);
 921       FCLOSE(fpout);
 922       return (1);
 923    }
 924
 925 #ifdef PNG_WRITE_SUPPORTED
 926    pngtest_debug("Setting jmpbuf for write struct");
 927
 928    if (setjmp(png_jmpbuf(write_ptr)))
 929    {
 930       fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
 931       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
 932       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
 933 #ifdef PNG_WRITE_SUPPORTED
 934       png_destroy_write_struct(&write_ptr, &write_info_ptr);
 935 #endif
 936       FCLOSE(fpin);
 937       FCLOSE(fpout);
 938       return (1);
 939    }
 940 #endif
 941 #endif
 942
 943    if (strict != 0)
 944    {
 945       /* Treat png_benign_error() as errors on read */
 946       png_set_benign_errors(read_ptr, 0);
 947
 948 #ifdef PNG_WRITE_SUPPORTED
 949       /* Treat them as errors on write */
 950       png_set_benign_errors(write_ptr, 0);
 951 #endif
 952
 953       /* if strict is not set, then app warnings and errors are treated as
 954        * warnings in release builds, but not in unstable builds; this can be
 955        * changed with '--relaxed'.
 956        */
 957    }
 958
 959    else if (relaxed != 0)
 960    {
 961       /* Allow application (pngtest) errors and warnings to pass */
 962       png_set_benign_errors(read_ptr, 1);
 963
 964 #ifdef PNG_WRITE_SUPPORTED
 965       png_set_benign_errors(write_ptr, 1);
 966 #endif
 967    }
 968
 969    pngtest_debug("Initializing input and output streams");
 970 #ifdef PNG_STDIO_SUPPORTED
 971    png_init_io(read_ptr, fpin);
 972 #  ifdef PNG_WRITE_SUPPORTED
 973    png_init_io(write_ptr, fpout);
 974 #  endif
 975 #else
 976    png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
 977 #  ifdef PNG_WRITE_SUPPORTED
 978    png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
 979 #    ifdef PNG_WRITE_FLUSH_SUPPORTED
 980       pngtest_flush);
 981 #    else
 982       NULL);
 983 #    endif
 984 #  endif
 985 #endif
 986
 987    if (status_dots_requested == 1)
 988    {
 989 #ifdef PNG_WRITE_SUPPORTED
 990       png_set_write_status_fn(write_ptr, write_row_callback);
 991 #endif
 992       png_set_read_status_fn(read_ptr, read_row_callback);
 993    }
 994
 995    else
 996    {
 997 #ifdef PNG_WRITE_SUPPORTED
 998       png_set_write_status_fn(write_ptr, NULL);
 999 #endif
1000       png_set_read_status_fn(read_ptr, NULL);
1001    }
1002
1003 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1004    {
1005       int i;
1006
1007       for (i = 0; i<256; i++)
1008          filters_used[i] = 0;
1009
1010       png_set_read_user_transform_fn(read_ptr, count_filters);
1011    }
1012 #endif
1013 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1014    zero_samples = 0;
1015    png_set_write_user_transform_fn(write_ptr, count_zero_samples);
1016 #endif
1017
1018 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
1019    /* Preserve all the unknown chunks, if possible.  If this is disabled then,
1020     * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use
1021     * libpng to *save* the unknown chunks on read (because we can't switch the
1022     * save option on!)
1023     *
1024     * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all
1025     * unknown chunks and write will write them all.
1026     */
1027 #ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
1028    png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1029       NULL, 0);
1030 #endif
1031 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1032    png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1033       NULL, 0);
1034 #endif
1035 #endif
1036
1037    pngtest_debug("Reading info struct");
1038    png_read_info(read_ptr, read_info_ptr);
1039
1040 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1041    /* This is a bit of a hack; there is no obvious way in the callback function
1042     * to determine that the chunks before the first IDAT have been read, so
1043     * remove the info_ptr (which is only used to determine position relative to
1044     * PLTE) here to indicate that we are after the IDAT.
1045     */
1046    user_chunk_data.info_ptr = NULL;
1047 #endif
1048
1049    pngtest_debug("Transferring info struct");
1050    {
1051       int interlace_type, compression_type, filter_type;
1052
1053       if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
1054           &color_type, &interlace_type, &compression_type, &filter_type) != 0)
1055       {
1056          png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
1057             color_type, interlace_type, compression_type, filter_type);
1058 #ifndef PNG_READ_INTERLACING_SUPPORTED
1059          /* num_pass will not be set below, set it here if the image is
1060           * interlaced: what happens is that write interlacing is *not* turned
1061           * on and the partial interlaced rows are written directly.
1062           */
1063          switch (interlace_type)
1064          {
1065             case PNG_INTERLACE_NONE:
1066                num_pass = 1;
1067                break;
1068
1069             case PNG_INTERLACE_ADAM7:
1070                num_pass = 7;
1071                 break;
1072
1073             default:
1074                 png_error(read_ptr, "invalid interlace type");
1075                 /*NOT REACHED*/
1076          }
1077 #endif
1078       }
1079    }
1080
1081 #ifdef PNG_FIXED_POINT_SUPPORTED
1082 #ifdef PNG_cHRM_SUPPORTED
1083    {
1084       png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
1085          blue_y;
1086
1087       if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
1088          &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
1089       {
1090          png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
1091             red_y, green_x, green_y, blue_x, blue_y);
1092       }
1093    }
1094 #endif
1095
1096 #ifdef PNG_gAMA_SUPPORTED
1097    {
1098       png_fixed_point gamma;
1099
1100       if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma) != 0)
1101          png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
1102    }
1103 #endif
1104 #else /* Use floating point versions */
1105 #ifdef PNG_FLOATING_POINT_SUPPORTED
1106 #ifdef PNG_cHRM_SUPPORTED
1107    {
1108       double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
1109          blue_y;
1110
1111       if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
1112          &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
1113       {
1114          png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
1115             red_y, green_x, green_y, blue_x, blue_y);
1116       }
1117    }
1118 #endif
1119 #ifdef PNG_gAMA_SUPPORTED
1120    {
1121       double gamma;
1122
1123       if (png_get_gAMA(read_ptr, read_info_ptr, &gamma) != 0)
1124          png_set_gAMA(write_ptr, write_info_ptr, gamma);
1125    }
1126 #endif
1127 #endif /* Floating point */
1128 #endif /* Fixed point */
1129
1130 #ifdef PNG_iCCP_SUPPORTED
1131    {
1132       png_charp name;
1133       png_bytep profile;
1134       png_uint_32 proflen;
1135       int compression_type;
1136
1137       if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
1138                       &profile, &proflen) != 0)
1139       {
1140          png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
1141                       profile, proflen);
1142       }
1143    }
1144 #endif
1145
1146 #ifdef PNG_sRGB_SUPPORTED
1147    {
1148       int intent;
1149
1150       if (png_get_sRGB(read_ptr, read_info_ptr, &intent) != 0)
1151          png_set_sRGB(write_ptr, write_info_ptr, intent);
1152    }
1153 #endif
1154
1155    {
1156       png_colorp palette;
1157       int num_palette;
1158
1159       if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette) != 0)
1160          png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
1161    }
1162
1163 #ifdef PNG_bKGD_SUPPORTED
1164    {
1165       png_color_16p background;
1166
1167       if (png_get_bKGD(read_ptr, read_info_ptr, &background) != 0)
1168       {
1169          png_set_bKGD(write_ptr, write_info_ptr, background);
1170       }
1171    }
1172 #endif
1173
1174 #ifdef PNG_hIST_SUPPORTED
1175    {
1176       png_uint_16p hist;
1177
1178       if (png_get_hIST(read_ptr, read_info_ptr, &hist) != 0)
1179          png_set_hIST(write_ptr, write_info_ptr, hist);
1180    }
1181 #endif
1182
1183 #ifdef PNG_oFFs_SUPPORTED
1184    {
1185       png_int_32 offset_x, offset_y;
1186       int unit_type;
1187
1188       if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
1189           &unit_type) != 0)
1190       {
1191          png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
1192       }
1193    }
1194 #endif
1195
1196 #ifdef PNG_pCAL_SUPPORTED
1197    {
1198       png_charp purpose, units;
1199       png_charpp params;
1200       png_int_32 X0, X1;
1201       int type, nparams;
1202
1203       if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
1204          &nparams, &units, &params) != 0)
1205       {
1206          png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
1207             nparams, units, params);
1208       }
1209    }
1210 #endif
1211
1212 #ifdef PNG_pHYs_SUPPORTED
1213    {
1214       png_uint_32 res_x, res_y;
1215       int unit_type;
1216
1217       if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y,
1218           &unit_type) != 0)
1219          png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
1220    }
1221 #endif
1222
1223 #ifdef PNG_sBIT_SUPPORTED
1224    {
1225       png_color_8p sig_bit;
1226
1227       if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit) != 0)
1228          png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
1229    }
1230 #endif
1231
1232 #ifdef PNG_sCAL_SUPPORTED
1233 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1234    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
1235    {
1236       int unit;
1237       double scal_width, scal_height;
1238
1239       if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
1240          &scal_height) != 0)
1241       {
1242          png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
1243       }
1244    }
1245 #else
1246 #ifdef PNG_FIXED_POINT_SUPPORTED
1247    {
1248       int unit;
1249       png_charp scal_width, scal_height;
1250
1251       if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
1252           &scal_height) != 0)
1253       {
1254          png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
1255              scal_height);
1256       }
1257    }
1258 #endif /* FIXED_POINT */
1259 #endif /* FLOATING_POINT */
1260 #endif /* sCAL */
1261
1262 #ifdef PNG_sPLT_SUPPORTED
1263    {
1264        png_sPLT_tp entries;
1265
1266        int num_entries = (int) png_get_sPLT(read_ptr, read_info_ptr, &entries);
1267        if (num_entries)
1268        {
1269            png_set_sPLT(write_ptr, write_info_ptr, entries, num_entries);
1270        }
1271    }
1272 #endif /* sPLT */
1273
1274 #ifdef PNG_TEXT_SUPPORTED
1275    {
1276       png_textp text_ptr;
1277       int num_text;
1278
1279       if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
1280       {
1281          pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
1282
1283          pngtest_check_text_support(read_ptr, text_ptr, num_text);
1284
1285          if (verbose != 0)
1286          {
1287             int i;
1288
1289             printf("\n");
1290             for (i=0; i<num_text; i++)
1291             {
1292                printf("   Text compression[%d]=%d\n",
1293                      i, text_ptr[i].compression);
1294             }
1295          }
1296
1297          png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
1298       }
1299    }
1300 #endif /* TEXT */
1301
1302 #ifdef PNG_tIME_SUPPORTED
1303    {
1304       png_timep mod_time;
1305
1306       if (png_get_tIME(read_ptr, read_info_ptr, &mod_time) != 0)
1307       {
1308          png_set_tIME(write_ptr, write_info_ptr, mod_time);
1309 #ifdef PNG_TIME_RFC1123_SUPPORTED
1310          if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
1311             tIME_string[(sizeof tIME_string) - 1] = '\0';
1312
1313          else
1314          {
1315             strncpy(tIME_string, "*** invalid time ***", (sizeof tIME_string));
1316             tIME_string[(sizeof tIME_string) - 1] = '\0';
1317          }
1318
1319          tIME_chunk_present++;
1320 #endif /* TIME_RFC1123 */
1321       }
1322    }
1323 #endif /* tIME */
1324
1325 #ifdef PNG_tRNS_SUPPORTED
1326    {
1327       png_bytep trans_alpha;
1328       int num_trans;
1329       png_color_16p trans_color;
1330
1331       if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
1332          &trans_color) != 0)
1333       {
1334          int sample_max = (1 << bit_depth);
1335          /* libpng doesn't reject a tRNS chunk with out-of-range samples */
1336          if (!((color_type == PNG_COLOR_TYPE_GRAY &&
1337              (int)trans_color->gray > sample_max) ||
1338              (color_type == PNG_COLOR_TYPE_RGB &&
1339              ((int)trans_color->red > sample_max ||
1340              (int)trans_color->green > sample_max ||
1341              (int)trans_color->blue > sample_max))))
1342             png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
1343                trans_color);
1344       }
1345    }
1346 #endif /* tRNS */
1347
1348 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1349    {
1350       png_unknown_chunkp unknowns;
1351       int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
1352          &unknowns);
1353
1354       if (num_unknowns != 0)
1355       {
1356          png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
1357            num_unknowns);
1358 #if PNG_LIBPNG_VER < 10600
1359          /* Copy the locations from the read_info_ptr.  The automatically
1360           * generated locations in write_end_info_ptr are wrong prior to 1.6.0
1361           * because they are reset from the write pointer (removed in 1.6.0).
1362           */
1363          {
1364             int i;
1365             for (i = 0; i < num_unknowns; i++)
1366               png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
1367                 unknowns[i].location);
1368          }
1369 #endif
1370       }
1371    }
1372 #endif
1373
1374 #ifdef PNG_WRITE_SUPPORTED
1375    pngtest_debug("Writing info struct");
1376
1377    /* Write the info in two steps so that if we write the 'unknown' chunks here
1378     * they go to the correct place.
1379     */
1380    png_write_info_before_PLTE(write_ptr, write_info_ptr);
1381
1382    write_chunks(write_ptr, before_PLTE); /* before PLTE */
1383
1384    png_write_info(write_ptr, write_info_ptr);
1385
1386    write_chunks(write_ptr, before_IDAT); /* after PLTE */
1387 #endif
1388
1389 #ifdef SINGLE_ROWBUF_ALLOC
1390    pngtest_debug("Allocating row buffer...");
1391    row_buf = (png_bytep)png_malloc(read_ptr,
1392       png_get_rowbytes(read_ptr, read_info_ptr));
1393
1394    pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
1395 #endif /* SINGLE_ROWBUF_ALLOC */
1396    pngtest_debug("Writing row data");
1397
1398 #ifdef PNG_READ_INTERLACING_SUPPORTED
1399    num_pass = png_set_interlace_handling(read_ptr);
1400    if (png_set_interlace_handling(write_ptr) != num_pass)
1401       png_error(write_ptr, "png_set_interlace_handling: inconsistent num_pass");
1402 #endif
1403
1404 #ifdef PNGTEST_TIMING
1405    t_stop = (float)clock();
1406    t_misc += (t_stop - t_start);
1407    t_start = t_stop;
1408 #endif
1409    for (pass = 0; pass < num_pass; pass++)
1410    {
1411       pngtest_debug1("Writing row data for pass %d", pass);
1412       for (y = 0; y < height; y++)
1413       {
1414 #ifndef SINGLE_ROWBUF_ALLOC
1415          pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
1416
1417          row_buf = (png_bytep)png_malloc(read_ptr,
1418             png_get_rowbytes(read_ptr, read_info_ptr));
1419
1420          pngtest_debug2("\t0x%08lx (%lu bytes)", (unsigned long)row_buf,
1421             (unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
1422
1423 #endif /* !SINGLE_ROWBUF_ALLOC */
1424          png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
1425
1426 #ifdef PNG_WRITE_SUPPORTED
1427 #ifdef PNGTEST_TIMING
1428          t_stop = (float)clock();
1429          t_decode += (t_stop - t_start);
1430          t_start = t_stop;
1431 #endif
1432          png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
1433 #ifdef PNGTEST_TIMING
1434          t_stop = (float)clock();
1435          t_encode += (t_stop - t_start);
1436          t_start = t_stop;
1437 #endif
1438 #endif /* WRITE */
1439
1440 #ifndef SINGLE_ROWBUF_ALLOC
1441          pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
1442          png_free(read_ptr, row_buf);
1443          row_buf = NULL;
1444 #endif /* !SINGLE_ROWBUF_ALLOC */
1445       }
1446    }
1447
1448 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1449 #  ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1450       png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
1451 #  endif
1452 #  ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1453       png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
1454 #  endif
1455 #endif
1456
1457    pngtest_debug("Reading and writing end_info data");
1458
1459    png_read_end(read_ptr, end_info_ptr);
1460 #ifdef PNG_TEXT_SUPPORTED
1461    {
1462       png_textp text_ptr;
1463       int num_text;
1464
1465       if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
1466       {
1467          pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
1468
1469          pngtest_check_text_support(read_ptr, text_ptr, num_text);
1470
1471          if (verbose != 0)
1472          {
1473             int i;
1474
1475             printf("\n");
1476             for (i=0; i<num_text; i++)
1477             {
1478                printf("   Text compression[%d]=%d\n",
1479                      i, text_ptr[i].compression);
1480             }
1481          }
1482
1483          png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
1484       }
1485    }
1486 #endif
1487 #ifdef PNG_tIME_SUPPORTED
1488    {
1489       png_timep mod_time;
1490
1491       if (png_get_tIME(read_ptr, end_info_ptr, &mod_time) != 0)
1492       {
1493          png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
1494 #ifdef PNG_TIME_RFC1123_SUPPORTED
1495          if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
1496             tIME_string[(sizeof tIME_string) - 1] = '\0';
1497
1498          else
1499          {
1500             strncpy(tIME_string, "*** invalid time ***", sizeof tIME_string);
1501             tIME_string[(sizeof tIME_string)-1] = '\0';
1502          }
1503
1504          tIME_chunk_present++;
1505 #endif /* TIME_RFC1123 */
1506       }
1507    }
1508 #endif
1509 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
1510    {
1511       png_unknown_chunkp unknowns;
1512       int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
1513          &unknowns);
1514
1515       if (num_unknowns != 0)
1516       {
1517          png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
1518            num_unknowns);
1519 #if PNG_LIBPNG_VER < 10600
1520          /* Copy the locations from the read_info_ptr.  The automatically
1521           * generated locations in write_end_info_ptr are wrong prior to 1.6.0
1522           * because they are reset from the write pointer (removed in 1.6.0).
1523           */
1524          {
1525             int i;
1526             for (i = 0; i < num_unknowns; i++)
1527               png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
1528                 unknowns[i].location);
1529          }
1530 #endif
1531       }
1532    }
1533 #endif
1534
1535 #ifdef PNG_WRITE_SUPPORTED
1536 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
1537    /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
1538     * This is here just to make pngtest replicate the results from libpng
1539     * versions prior to 1.5.4, and to test this new API.
1540     */
1541    png_set_text_compression_strategy(write_ptr, Z_FILTERED);
1542 #endif
1543
1544    /* When the unknown vpAg/sTER chunks are written by pngtest the only way to
1545     * do it is to write them *before* calling png_write_end.  When unknown
1546     * chunks are written by libpng, however, they are written just before IEND.
1547     * There seems to be no way round this, however vpAg/sTER are not expected
1548     * after IDAT.
1549     */
1550    write_chunks(write_ptr, after_IDAT);
1551
1552    png_write_end(write_ptr, write_end_info_ptr);
1553 #endif
1554
1555 #ifdef PNG_EASY_ACCESS_SUPPORTED
1556    if (verbose != 0)
1557    {
1558       png_uint_32 iwidth, iheight;
1559       iwidth = png_get_image_width(write_ptr, write_info_ptr);
1560       iheight = png_get_image_height(write_ptr, write_info_ptr);
1561       fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
1562          (unsigned long)iwidth, (unsigned long)iheight);
1563    }
1564 #endif
1565
1566    pngtest_debug("Destroying data structs");
1567 #ifdef SINGLE_ROWBUF_ALLOC
1568    pngtest_debug("destroying row_buf for read_ptr");
1569    png_free(read_ptr, row_buf);
1570    row_buf = NULL;
1571 #endif /* SINGLE_ROWBUF_ALLOC */
1572    pngtest_debug("destroying read_ptr, read_info_ptr, end_info_ptr");
1573    png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
1574 #ifdef PNG_WRITE_SUPPORTED
1575    pngtest_debug("destroying write_end_info_ptr");
1576    png_destroy_info_struct(write_ptr, &write_end_info_ptr);
1577    pngtest_debug("destroying write_ptr, write_info_ptr");
1578    png_destroy_write_struct(&write_ptr, &write_info_ptr);
1579 #endif
1580    pngtest_debug("Destruction complete.");
1581
1582    FCLOSE(fpin);
1583    FCLOSE(fpout);
1584
1585    /* Summarize any warnings or errors and in 'strict' mode fail the test.
1586     * Unsupported chunks can result in warnings, in that case ignore the strict
1587     * setting, otherwise fail the test on warnings as well as errors.
1588     */
1589    if (error_count > 0)
1590    {
1591       /* We don't really expect to get here because of the setjmp handling
1592        * above, but this is safe.
1593        */
1594       fprintf(STDERR, "\n  %s: %d libpng errors found (%d warnings)",
1595          inname, error_count, warning_count);
1596
1597       if (strict != 0)
1598          return (1);
1599    }
1600
1601 #  ifdef PNG_WRITE_SUPPORTED
1602       /* If there we no write support nothing was written! */
1603       else if (unsupported_chunks > 0)
1604       {
1605          fprintf(STDERR, "\n  %s: unsupported chunks (%d)%s",
1606             inname, unsupported_chunks, strict ? ": IGNORED --strict!" : "");
1607       }
1608 #  endif
1609
1610    else if (warning_count > 0)
1611    {
1612       fprintf(STDERR, "\n  %s: %d libpng warnings found",
1613          inname, warning_count);
1614
1615       if (strict != 0)
1616          return (1);
1617    }
1618
1619    pngtest_debug("Opening files for comparison");
1620    if ((fpin = fopen(inname, "rb")) == NULL)
1621    {
1622       fprintf(STDERR, "Could not find file %s\n", inname);
1623       return (1);
1624    }
1625
1626    if ((fpout = fopen(outname, "rb")) == NULL)
1627    {
1628       fprintf(STDERR, "Could not find file %s\n", outname);
1629       FCLOSE(fpin);
1630       return (1);
1631    }
1632
1633 #ifdef PNG_WRITE_SUPPORTED /* else nothing was written */
1634    if (interlace_preserved != 0) /* else the files will be changed */
1635    {
1636       for (;;)
1637       {
1638          static int wrote_question = 0;
1639          png_size_t num_in, num_out;
1640          char inbuf[256], outbuf[256];
1641
1642          num_in = fread(inbuf, 1, sizeof inbuf, fpin);
1643          num_out = fread(outbuf, 1, sizeof outbuf, fpout);
1644
1645          if (num_in != num_out)
1646          {
1647             fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
1648                     inname, outname);
1649
1650             if (wrote_question == 0 && unsupported_chunks == 0)
1651             {
1652                fprintf(STDERR,
1653          "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
1654                  inname, PNG_ZBUF_SIZE);
1655                fprintf(STDERR,
1656                  "\n   filtering heuristic (libpng default), compression");
1657                fprintf(STDERR,
1658                  " level (zlib default),\n   and zlib version (%s)?\n\n",
1659                  ZLIB_VERSION);
1660                wrote_question = 1;
1661             }
1662
1663             FCLOSE(fpin);
1664             FCLOSE(fpout);
1665
1666             if (strict != 0 && unsupported_chunks == 0)
1667               return (1);
1668
1669             else
1670               return (0);
1671          }
1672
1673          if (num_in == 0)
1674             break;
1675
1676          if (memcmp(inbuf, outbuf, num_in))
1677          {
1678             fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
1679                outname);
1680
1681             if (wrote_question == 0 && unsupported_chunks == 0)
1682             {
1683                fprintf(STDERR,
1684          "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
1685                     inname, PNG_ZBUF_SIZE);
1686                fprintf(STDERR,
1687                  "\n   filtering heuristic (libpng default), compression");
1688                fprintf(STDERR,
1689                  " level (zlib default),\n   and zlib version (%s)?\n\n",
1690                  ZLIB_VERSION);
1691                wrote_question = 1;
1692             }
1693
1694             FCLOSE(fpin);
1695             FCLOSE(fpout);
1696
1697             /* NOTE: the unsupported_chunks escape is permitted here because
1698              * unsupported text chunk compression will result in the compression
1699              * mode being changed (to NONE) yet, in the test case, the result
1700              * can be exactly the same size!
1701              */
1702             if (strict != 0 && unsupported_chunks == 0)
1703               return (1);
1704
1705             else
1706               return (0);
1707          }
1708       }
1709    }
1710 #endif /* WRITE */
1711
1712    FCLOSE(fpin);
1713    FCLOSE(fpout);
1714
1715    return (0);
1716 }
1717
1718 /* Input and output filenames */
1719 #ifdef RISCOS
1720 static PNG_CONST char *inname = "pngtest/png";
1721 static PNG_CONST char *outname = "pngout/png";
1722 #else
1723 static PNG_CONST char *inname = "pngtest.png";
1724 static PNG_CONST char *outname = "pngout.png";
1725 #endif
1726
1727 int
1728 main(int argc, char *argv[])
1729 {
1730    int multiple = 0;
1731    int ierror = 0;
1732
1733    png_structp dummy_ptr;
1734
1735    fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
1736    fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
1737    fprintf(STDERR, "%s", png_get_copyright(NULL));
1738    /* Show the version of libpng used in building the library */
1739    fprintf(STDERR, " library (%lu):%s",
1740       (unsigned long)png_access_version_number(),
1741       png_get_header_version(NULL));
1742
1743    /* Show the version of libpng used in building the application */
1744    fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
1745       PNG_HEADER_VERSION_STRING);
1746
1747    /* Do some consistency checking on the memory allocation settings, I'm
1748     * not sure this matters, but it is nice to know, the first of these
1749     * tests should be impossible because of the way the macros are set
1750     * in pngconf.h
1751     */
1752 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
1753       fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
1754 #endif
1755    /* I think the following can happen. */
1756 #if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
1757       fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
1758 #endif
1759
1760    if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
1761    {
1762       fprintf(STDERR,
1763          "Warning: versions are different between png.h and png.c\n");
1764       fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
1765       fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
1766       ++ierror;
1767    }
1768
1769    if (argc > 1)
1770    {
1771       if (strcmp(argv[1], "-m") == 0)
1772       {
1773          multiple = 1;
1774          status_dots_requested = 0;
1775       }
1776
1777       else if (strcmp(argv[1], "-mv") == 0 ||
1778                strcmp(argv[1], "-vm") == 0 )
1779       {
1780          multiple = 1;
1781          verbose = 1;
1782          status_dots_requested = 1;
1783       }
1784
1785       else if (strcmp(argv[1], "-v") == 0)
1786       {
1787          verbose = 1;
1788          status_dots_requested = 1;
1789          inname = argv[2];
1790       }
1791
1792       else if (strcmp(argv[1], "--strict") == 0)
1793       {
1794          status_dots_requested = 0;
1795          verbose = 1;
1796          inname = argv[2];
1797          strict++;
1798          relaxed = 0;
1799       }
1800
1801       else if (strcmp(argv[1], "--relaxed") == 0)
1802       {
1803          status_dots_requested = 0;
1804          verbose = 1;
1805          inname = argv[2];
1806          strict = 0;
1807          relaxed++;
1808       }
1809
1810       else
1811       {
1812          inname = argv[1];
1813          status_dots_requested = 0;
1814       }
1815    }
1816
1817    if (multiple == 0 && argc == 3 + verbose)
1818      outname = argv[2 + verbose];
1819
1820    if ((multiple == 0 && argc > 3 + verbose) ||
1821        (multiple != 0 && argc < 2))
1822    {
1823      fprintf(STDERR,
1824        "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
1825         argv[0], argv[0]);
1826      fprintf(STDERR,
1827        "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
1828      fprintf(STDERR,
1829        "  with -m %s is used as a temporary file\n", outname);
1830      exit(1);
1831    }
1832
1833    if (multiple != 0)
1834    {
1835       int i;
1836 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1837       int allocation_now = current_allocation;
1838 #endif
1839       for (i=2; i<argc; ++i)
1840       {
1841          int kerror;
1842          fprintf(STDERR, "\n Testing %s:", argv[i]);
1843 #if PNG_DEBUG > 0
1844          fprintf(STDERR, "\n");
1845 #endif
1846          kerror = test_one_file(argv[i], outname);
1847          if (kerror == 0)
1848          {
1849 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1850             int k;
1851 #endif
1852 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1853             fprintf(STDERR, "\n PASS (%lu zero samples)\n",
1854                (unsigned long)zero_samples);
1855 #else
1856             fprintf(STDERR, " PASS\n");
1857 #endif
1858 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1859             for (k = 0; k<256; k++)
1860                if (filters_used[k] != 0)
1861                   fprintf(STDERR, " Filter %d was used %lu times\n",
1862                      k, (unsigned long)filters_used[k]);
1863 #endif
1864 #ifdef PNG_TIME_RFC1123_SUPPORTED
1865             if (tIME_chunk_present != 0)
1866                fprintf(STDERR, " tIME = %s\n", tIME_string);
1867
1868             tIME_chunk_present = 0;
1869 #endif /* TIME_RFC1123 */
1870          }
1871
1872          else
1873          {
1874             fprintf(STDERR, " FAIL\n");
1875             ierror += kerror;
1876          }
1877 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1878          if (allocation_now != current_allocation)
1879             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
1880                current_allocation - allocation_now);
1881
1882          if (current_allocation != 0)
1883          {
1884             memory_infop pinfo = pinformation;
1885
1886             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
1887                current_allocation);
1888
1889             while (pinfo != NULL)
1890             {
1891                fprintf(STDERR, " %lu bytes at %p\n",
1892                  (unsigned long)pinfo->size,
1893                  pinfo->pointer);
1894                pinfo = pinfo->next;
1895             }
1896          }
1897 #endif
1898       }
1899 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1900          fprintf(STDERR, " Current memory allocation: %10d bytes\n",
1901             current_allocation);
1902          fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
1903             maximum_allocation);
1904          fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
1905             total_allocation);
1906          fprintf(STDERR, "     Number of allocations: %10d\n",
1907             num_allocations);
1908 #endif
1909    }
1910
1911    else
1912    {
1913       int i;
1914       for (i = 0; i<3; ++i)
1915       {
1916          int kerror;
1917 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1918          int allocation_now = current_allocation;
1919 #endif
1920          if (i == 1)
1921             status_dots_requested = 1;
1922
1923          else if (verbose == 0)
1924             status_dots_requested = 0;
1925
1926          if (i == 0 || verbose == 1 || ierror != 0)
1927          {
1928             fprintf(STDERR, "\n Testing %s:", inname);
1929 #if PNG_DEBUG > 0
1930             fprintf(STDERR, "\n");
1931 #endif
1932          }
1933
1934          kerror = test_one_file(inname, outname);
1935
1936          if (kerror == 0)
1937          {
1938             if (verbose == 1 || i == 2)
1939             {
1940 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1941                 int k;
1942 #endif
1943 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1944                 fprintf(STDERR, "\n PASS (%lu zero samples)\n",
1945                    (unsigned long)zero_samples);
1946 #else
1947                 fprintf(STDERR, " PASS\n");
1948 #endif
1949 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1950                 for (k = 0; k<256; k++)
1951                    if (filters_used[k] != 0)
1952                       fprintf(STDERR, " Filter %d was used %lu times\n",
1953                          k, (unsigned long)filters_used[k]);
1954 #endif
1955 #ifdef PNG_TIME_RFC1123_SUPPORTED
1956              if (tIME_chunk_present != 0)
1957                 fprintf(STDERR, " tIME = %s\n", tIME_string);
1958 #endif /* TIME_RFC1123 */
1959             }
1960          }
1961
1962          else
1963          {
1964             if (verbose == 0 && i != 2)
1965             {
1966                fprintf(STDERR, "\n Testing %s:", inname);
1967 #if PNG_DEBUG > 0
1968                fprintf(STDERR, "\n");
1969 #endif
1970             }
1971
1972             fprintf(STDERR, " FAIL\n");
1973             ierror += kerror;
1974          }
1975 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1976          if (allocation_now != current_allocation)
1977              fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
1978                current_allocation - allocation_now);
1979
1980          if (current_allocation != 0)
1981          {
1982              memory_infop pinfo = pinformation;
1983
1984              fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
1985                 current_allocation);
1986
1987              while (pinfo != NULL)
1988              {
1989                 fprintf(STDERR, " %lu bytes at %p\n",
1990                    (unsigned long)pinfo->size, pinfo->pointer);
1991                 pinfo = pinfo->next;
1992              }
1993           }
1994 #endif
1995        }
1996 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
1997        fprintf(STDERR, " Current memory allocation: %10d bytes\n",
1998           current_allocation);
1999        fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
2000           maximum_allocation);
2001        fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
2002           total_allocation);
2003        fprintf(STDERR, "     Number of allocations: %10d\n",
2004             num_allocations);
2005 #endif
2006    }
2007
2008 #ifdef PNGTEST_TIMING
2009    t_stop = (float)clock();
2010    t_misc += (t_stop - t_start);
2011    t_start = t_stop;
2012    fprintf(STDERR, " CPU time used = %.3f seconds",
2013       (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
2014    fprintf(STDERR, " (decoding %.3f,\n",
2015       t_decode/(float)CLOCKS_PER_SEC);
2016    fprintf(STDERR, "        encoding %.3f ,",
2017       t_encode/(float)CLOCKS_PER_SEC);
2018    fprintf(STDERR, " other %.3f seconds)\n\n",
2019       t_misc/(float)CLOCKS_PER_SEC);
2020 #endif
2021
2022    if (ierror == 0)
2023       fprintf(STDERR, " libpng passes test\n");
2024
2025    else
2026       fprintf(STDERR, " libpng FAILS test\n");
2027
2028    dummy_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
2029    fprintf(STDERR, " Default limits:\n");
2030    fprintf(STDERR, "  width_max  = %lu\n",
2031       (unsigned long) png_get_user_width_max(dummy_ptr));
2032    fprintf(STDERR, "  height_max = %lu\n",
2033       (unsigned long) png_get_user_height_max(dummy_ptr));
2034    if (png_get_chunk_cache_max(dummy_ptr) == 0)
2035       fprintf(STDERR, "  cache_max  = unlimited\n");
2036    else
2037       fprintf(STDERR, "  cache_max  = %lu\n",
2038          (unsigned long) png_get_chunk_cache_max(dummy_ptr));
2039    if (png_get_chunk_malloc_max(dummy_ptr) == 0)
2040       fprintf(STDERR, "  malloc_max = unlimited\n");
2041    else
2042       fprintf(STDERR, "  malloc_max = %lu\n",
2043          (unsigned long) png_get_chunk_malloc_max(dummy_ptr));
2044    png_destroy_read_struct(&dummy_ptr, NULL, NULL);
2045
2046    return (int)(ierror != 0);
2047 }
2048 #else
2049 int
2050 main(void)
2051 {
2052    fprintf(STDERR,
2053       " test ignored because libpng was not built with read support\n");
2054    /* And skip this test */
2055    return PNG_LIBPNG_VER < 10600 ? 0 : 77;
2056 }
2057 #endif
2058
2059 /* Generate a compiler error if there is an old png.h in the search path. */
2060 typedef png_libpng_version_1_6_19 Your_png_h_is_not_version_1_6_19;