text: 
  /* pngtest.c - a simple test program to test libpng
   *
   * Last changed in libpng 1.4.1 [February 25, 2010]
   * Copyright (c) 1998-2010 Glenn Randers-Pehrson
   * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
   * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
   *
   * This code is released under the libpng license.
   * For conditions of distribution and use, see the disclaimer
   * and license in png.h
   *
   * This program reads in a PNG image, writes it out again, and then
   * compares the two files.  If the files are identical, this shows that
   * the basic chunk handling, filtering, and (de)compression code is working
   * properly.  It does not currently test all of the transforms, although
   * it probably should.
   *
   * The program will report "FAIL" in certain legitimate cases:
   * 1) when the compression level or filter selection method is changed.
   * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
   * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
   *    exist in the input file.
   * 4) others not listed here...
   * In these cases, it is best to check with another tool such as "pngcheck"
   * to see what the differences between the two files are.
   *
   * If a filename is given on the command-line, then this file is used
   * for the input, rather than the default "pngtest.png".  This allows
   * testing a wide variety of files easily.  You can also test a number
   * of files at once by typing "pngtest -m file1.png file2.png ..."
   */
  
  #include "png.h"
  #include "pngpriv.h"
  
  #  include <stdio.h>
  #  include <stdlib.h>
  #  define FCLOSE(file) fclose(file)
  
  #ifndef PNG_STDIO_SUPPORTED
       typedef FILE                * png_FILE_p;
  #endif
  
  /* Makes pngtest verbose so we can find problems (needs to be before png.h) */
  #ifndef PNG_DEBUG
  #  define PNG_DEBUG 0
  #endif
  
  #if !PNG_DEBUG
  #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
  #endif
  
  /* Turn on CPU timing
  #define PNGTEST_TIMING
  */
  
  #ifndef PNG_FLOATING_POINT_SUPPORTED
  #undef PNGTEST_TIMING
  #endif
  
  #ifdef PNGTEST_TIMING
  static float t_start, t_stop, t_decode, t_encode, t_misc;
  #include <time.h>
  #endif
  
  #ifdef PNG_TIME_RFC1123_SUPPORTED
  #define PNG_tIME_STRING_LENGTH 29
  static int tIME_chunk_present = 0;
  static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
  #endif
  
  static int verbose = 0;
  
  int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
  
  #ifdef __TURBOC__
  #include <mem.h>
  #endif
  
  /* Defined so I can write to a file on gui/windowing platforms */
  /*  #define STDERR stderr  */
  #define STDERR stdout   /* For DOS */
  
  /* In case a system header (e.g., on AIX) defined jmpbuf */
  #ifdef jmpbuf
  #  undef jmpbuf
  #endif
  
  /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
  #ifndef png_jmpbuf
  #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
  #endif
  
  /* Example of using row callbacks to make a simple progress meter */
  static int status_pass = 1;
  static int status_dots_requested = 0;
  static int status_dots = 1;
  
  void
  read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
  void
  read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
  {
     if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
        return;
     if (status_pass != pass)
     {
        fprintf(stdout, "\n Pass %d: ", pass);
        status_pass = pass;
        status_dots = 31;
     }
     status_dots--;
     if (status_dots == 0)
     {
        fprintf(stdout, "\n         ");
        status_dots=30;
     }
     fprintf(stdout, "r");
  }
  
  void
  write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
  void
  write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
  {
     if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
        return;
     fprintf(stdout, "w");
  }
  
  
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
  /* Example of using user transform callback (we don't transform anything,
   * but merely examine the row filters.  We set this to 256 rather than
   * 5 in case illegal filter values are present.)
   */
  static png_uint_32 filters_used[256];
  void
  count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data);
  void
  count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
  {
     if (png_ptr != NULL && row_info != NULL)
        ++filters_used[*(data - 1)];
  }
  #endif
  
  #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
  /* Example of using user transform callback (we don't transform anything,
   * but merely count the zero samples)
   */
  
  static png_uint_32 zero_samples;
  
  void
  count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data);
  void
  count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
  {
     png_bytep dp = data;
     if (png_ptr == NULL)return;
  
     /* Contents of row_info:
      *  png_uint_32 width      width of row
      *  png_uint_32 rowbytes   number of bytes in row
      *  png_byte color_type    color type of pixels
      *  png_byte bit_depth     bit depth of samples
      *  png_byte channels      number of channels (1-4)
      *  png_byte pixel_depth   bits per pixel (depth*channels)
      */
  
      /* Counts the number of zero samples (or zero pixels if color_type is 3 */
  
      if (row_info->color_type == 0 || row_info->color_type == 3)
      {
         int pos = 0;
         png_uint_32 n, nstop;
         for (n = 0, nstop=row_info->width; n<nstop; n++)
         {
            if (row_info->bit_depth == 1)
            {
               if (((*dp << pos++ ) & 0x80) == 0)
                  zero_samples++;
               if (pos == 8)
               {
                  pos = 0;
                  dp++;
               }
            }
            if (row_info->bit_depth == 2)
            {
               if (((*dp << (pos+=2)) & 0xc0) == 0)
                  zero_samples++;
               if (pos == 8)
               {
                  pos = 0;
                  dp++;
               }
            }
            if (row_info->bit_depth == 4)
            {
               if (((*dp << (pos+=4)) & 0xf0) == 0)
                  zero_samples++;
               if (pos == 8)
               {
                  pos = 0;
                  dp++;
               }
            }
            if (row_info->bit_depth == 8)
               if (*dp++ == 0)
                  zero_samples++;
            if (row_info->bit_depth == 16)
            {
               if ((*dp | *(dp+1)) == 0)
                  zero_samples++;
               dp+=2;
            }
         }
      }
      else /* Other color types */
      {
         png_uint_32 n, nstop;
         int channel;
         int color_channels = row_info->channels;
         if (row_info->color_type > 3)color_channels--;
  
         for (n = 0, nstop=row_info->width; n<nstop; n++)
         {
            for (channel = 0; channel < color_channels; channel++)
            {
               if (row_info->bit_depth == 8)
                  if (*dp++ == 0)
                     zero_samples++;
               if (row_info->bit_depth == 16)
               {
                  if ((*dp | *(dp+1)) == 0)
                     zero_samples++;
                  dp+=2;
               }
            }
            if (row_info->color_type > 3)
            {
               dp++;
               if (row_info->bit_depth == 16)
                  dp++;
            }
         }
      }
  }
  #endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */
  
  static int wrote_question = 0;
  
  #ifndef PNG_STDIO_SUPPORTED
  /* START of code to validate stdio-free compilation */
  /* These copies of the default read/write functions come from pngrio.c and
   * pngwio.c.  They allow "don't include stdio" testing of the library.
   * This is the function that does the actual reading of data.  If you are
   * not reading from a standard C stream, you should create a replacement
   * read_data function and use it at run time with png_set_read_fn(), rather
   * than changing the library.
   */
  
  #ifndef USE_FAR_KEYWORD
  static void
  pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
  {
     png_size_t check = 0;
     png_voidp io_ptr;
  
     /* fread() returns 0 on error, so it is OK to store this in a png_size_t
      * instead of an int, which is what fread() actually returns.
      */
     io_ptr = png_get_io_ptr(png_ptr);
     if (io_ptr != NULL)
     {
        check = fread(data, 1, length, (png_FILE_p)io_ptr);
     }
  
     if (check != length)
     {
        png_error(png_ptr, "Read Error!");
     }
  }
  #else
  /* This is the model-independent version. Since the standard I/O library
     can't handle far buffers in the medium and small models, we have to copy
     the data.
  */
  
  #define NEAR_BUF_SIZE 1024
  #define MIN(a,b) (a <= b ? a : b)
  
  static void
  pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
  {
     png_size_t check;
     png_byte *n_data;
     png_FILE_p io_ptr;
  
     /* Check if data really is near. If so, use usual code. */
     n_data = (png_byte *)CVT_PTR_NOCHECK(data);
     io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr));
     if ((png_bytep)n_data == data)
     {
        check = fread(n_data, 1, length, io_ptr);
     }
     else
     {
        png_byte buf[NEAR_BUF_SIZE];
        png_size_t read, remaining, err;
        check = 0;
        remaining = length;
        do
        {
           read = MIN(NEAR_BUF_SIZE, remaining);
           err = fread(buf, 1, 1, io_ptr);
           png_memcpy(data, buf, read); /* Copy far buffer to near buffer */
           if (err != read)
              break;
           else
              check += err;
           data += read;
           remaining -= read;
        }
        while (remaining != 0);
     }
     if (check != length)
        png_error(png_ptr, "read Error");
  }
  #endif /* USE_FAR_KEYWORD */
  
  #ifdef PNG_WRITE_FLUSH_SUPPORTED
  static void
  pngtest_flush(png_structp png_ptr)
  {
     /* Do nothing; fflush() is said to be just a waste of energy. */
     png_ptr = png_ptr;  /* Stifle compiler warning */
  }
  #endif
  
  /* This is the function that does the actual writing of data.  If you are
   * not writing to a standard C stream, you should create a replacement
   * write_data function and use it at run time with png_set_write_fn(), rather
   * than changing the library.
   */
  #ifndef USE_FAR_KEYWORD
  static void
  pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
  {
     png_size_t check;
     png_FILE_p io_ptr;
     io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr));
  
     check = fwrite(data, 1, length, io_ptr);
     if (check != length)
     {
        png_error(png_ptr, "Write Error");
     }
  }
  #else
  /* This is the model-independent version. Since the standard I/O library
     can't handle far buffers in the medium and small models, we have to copy
     the data.
  */
  
  #define NEAR_BUF_SIZE 1024
  #define MIN(a,b) (a <= b ? a : b)
  
  static void
  pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
  {
     png_size_t check;
     png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
     png_FILE_p io_ptr;
  
     /* Check if data really is near. If so, use usual code. */
     near_data = (png_byte *)CVT_PTR_NOCHECK(data);
     io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
     if ((png_bytep)near_data == data)
     {
        check = fwrite(near_data, 1, length, io_ptr);
     }
     else
     {
        png_byte buf[NEAR_BUF_SIZE];
        png_size_t written, remaining, err;
        check = 0;
        remaining = length;
        do
        {
           written = MIN(NEAR_BUF_SIZE, remaining);
           png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
           err = fwrite(buf, 1, written, io_ptr);
           if (err != written)
              break;
           else
              check += err;
           data += written;
           remaining -= written;
        }
        while (remaining != 0);
     }
     if (check != length)
     {
        png_error(png_ptr, "Write Error");
     }
  }
  #endif /* USE_FAR_KEYWORD */
  
  /* This function is called when there is a warning, but the library thinks
   * it can continue anyway.  Replacement functions don't have to do anything
   * here if you don't want to.  In the default configuration, png_ptr is
   * not used, but it is passed in case it may be useful.
   */
  static void
  pngtest_warning(png_structp png_ptr, png_const_charp message)
  {
     PNG_CONST char *name = "UNKNOWN (ERROR!)";
     char *test;
     test = png_get_error_ptr(png_ptr);
     if (test == NULL)
       fprintf(STDERR, "%s: libpng warning: %s\n", name, message);
     else
       fprintf(STDERR, "%s: libpng warning: %s\n", test, message);
  }
  
  /* This is the default error handling function.  Note that replacements for
   * this function MUST NOT RETURN, or the program will likely crash.  This
   * function is used by default, or if the program supplies NULL for the
   * error function pointer in png_set_error_fn().
   */
  static void
  pngtest_error(png_structp png_ptr, png_const_charp message)
  {
     pngtest_warning(png_ptr, message);
     /* We can return because png_error calls the default handler, which is
      * actually OK in this case.
      */
  }
  #endif /* !PNG_STDIO_SUPPORTED */
  /* END of code to validate stdio-free compilation */
  
  /* START of code to validate memory allocation and deallocation */
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
  
  /* Allocate memory.  For reasonable files, size should never exceed
   * 64K.  However, zlib may allocate more then 64K if you don't tell
   * it not to.  See zconf.h and png.h for more information.  zlib does
   * need to allocate exactly 64K, so whatever you call here must
   * have the ability to do that.
   *
   * This piece of code can be compiled to validate max 64K allocations
   * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
   */
  typedef struct memory_information
  {
     png_alloc_size_t          size;
     png_voidp                 pointer;
     struct memory_information FAR *next;
  } memory_information;
  typedef memory_information FAR *memory_infop;
  
  static memory_infop pinformation = NULL;
  static int current_allocation = 0;
  static int maximum_allocation = 0;
  static int total_allocation = 0;
  static int num_allocations = 0;
  
  png_voidp png_debug_malloc
     PNGARG((png_structp png_ptr, png_alloc_size_t size));
  void png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
  
  png_voidp
  png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
  {
  
     /* png_malloc has already tested for NULL; png_create_struct calls
      * png_debug_malloc directly, with png_ptr == NULL which is OK
      */
  
     if (size == 0)
        return (NULL);
  
     /* This calls the library allocator twice, once to get the requested
        buffer and once to get a new free list entry. */
     {
        /* Disable malloc_fn and free_fn */
        memory_infop pinfo;
        png_set_mem_fn(png_ptr, NULL, NULL, NULL);
        pinfo = (memory_infop)png_malloc(png_ptr,
           png_sizeof(*pinfo));
        pinfo->size = size;
        current_allocation += size;
        total_allocation += size;
        num_allocations ++;
        if (current_allocation > maximum_allocation)
           maximum_allocation = current_allocation;
        pinfo->pointer = png_malloc(png_ptr, size);
        /* Restore malloc_fn and free_fn */
        png_set_mem_fn(png_ptr,
            NULL, png_debug_malloc, png_debug_free);
        if (size != 0 && pinfo->pointer == NULL)
        {
           current_allocation -= size;
           total_allocation -= size;
           png_error(png_ptr,
             "out of memory in pngtest->png_debug_malloc");
        }
        pinfo->next = pinformation;
        pinformation = pinfo;
        /* Make sure the caller isn't assuming zeroed memory. */
        png_memset(pinfo->pointer, 0xdd, pinfo->size);
        if (verbose)
           printf("png_malloc %lu bytes at %x\n", (unsigned long)size,
              pinfo->pointer);
        return (png_voidp)(pinfo->pointer);
     }
  }
  
  /* Free a pointer.  It is removed from the list at the same time. */
  void
  png_debug_free(png_structp png_ptr, png_voidp ptr)
  {
     if (png_ptr == NULL)
        fprintf(STDERR, "NULL pointer to png_debug_free.\n");
     if (ptr == 0)
     {
  #if 0 /* This happens all the time. */
        fprintf(STDERR, "WARNING: freeing NULL pointer\n");
  #endif
        return;
     }
  
     /* Unlink the element from the list. */
     {
        memory_infop FAR *ppinfo = &pinformation;
        for (;;)
        {
           memory_infop pinfo = *ppinfo;
           if (pinfo->pointer == ptr)
           {
              *ppinfo = pinfo->next;
              current_allocation -= pinfo->size;
              if (current_allocation < 0)
                 fprintf(STDERR, "Duplicate free of memory\n");
              /* We must free the list element too, but first kill
                 the memory that is to be freed. */
              png_memset(ptr, 0x55, pinfo->size);
              png_free_default(png_ptr, pinfo);
              pinfo = NULL;
              break;
           }
           if (pinfo->next == NULL)
           {
              fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
              break;
           }
           ppinfo = &pinfo->next;
        }
     }
  
     /* Finally free the data. */
     if (verbose)
        printf("Freeing %x\n", ptr);
     png_free_default(png_ptr, ptr);
     ptr = NULL;
  }
  #endif /* PNG_USER_MEM_SUPPORTED && PNG_DEBUG */
  /* END of code to test memory allocation/deallocation */
  
  
  /* Demonstration of user chunk support of the sTER and vpAg chunks */
  #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
  
  /* (sTER is a public chunk not yet known by libpng.  vpAg is a private
  chunk used in ImageMagick to store "virtual page" size).  */
  
  static png_uint_32 user_chunk_data[4];
  
      /* 0: sTER mode + 1
       * 1: vpAg width
       * 2: vpAg height
       * 3: vpAg units
       */
  
  static int read_user_chunk_callback(png_struct *png_ptr,
     png_unknown_chunkp chunk)
  {
     png_uint_32
       *my_user_chunk_data;
  
     /* Return one of the following:
      *    return (-n);  chunk had an error
      *    return (0);  did not recognize
      *    return (n);  success
      *
      * The unknown chunk structure contains the chunk data:
      * png_byte name[5];
      * png_byte *data;
      * png_size_t size;
      *
      * Note that libpng has already taken care of the CRC handling.
      */
  
     if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
         chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
        {
           /* Found sTER chunk */
           if (chunk->size != 1)
              return (-1); /* Error return */
           if (chunk->data[0] != 0 && chunk->data[0] != 1)
              return (-1);  /* Invalid mode */
           my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
           my_user_chunk_data[0]=chunk->data[0]+1;
           return (1);
        }
  
     if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
         chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
        return (0); /* Did not recognize */
  
     /* Found ImageMagick vpAg chunk */
  
     if (chunk->size != 9)
        return (-1); /* Error return */
  
     my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
  
     my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);
     my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);
     my_user_chunk_data[3]=(png_uint_32)chunk->data[8];
  
     return (1);
  
  }
  #endif
  /* END of code to demonstrate user chunk support */
  
  /* Test one file */
  int
  test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
  {
     static png_FILE_p fpin;
     static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
     png_structp read_ptr;
     png_infop read_info_ptr, end_info_ptr;
  #ifdef PNG_WRITE_SUPPORTED
     png_structp write_ptr;
     png_infop write_info_ptr;
     png_infop write_end_info_ptr;
  #else
     png_structp write_ptr = NULL;
     png_infop write_info_ptr = NULL;
     png_infop write_end_info_ptr = NULL;
  #endif
     png_bytep row_buf;
     png_uint_32 y;
     png_uint_32 width, height;
     int num_pass, pass;
     int bit_depth, color_type;
  #ifdef PNG_SETJMP_SUPPORTED
  #ifdef USE_FAR_KEYWORD
     jmp_buf jmpbuf;
  #endif
  #endif
  
     char inbuf[256], outbuf[256];
  
     row_buf = NULL;
  
     if ((fpin = fopen(inname, "rb")) == NULL)
     {
        fprintf(STDERR, "Could not find input file %s\n", inname);
        return (1);
     }
  
     if ((fpout = fopen(outname, "wb")) == NULL)
     {
        fprintf(STDERR, "Could not open output file %s\n", outname);
        FCLOSE(fpin);
        return (1);
     }
  
     png_debug(0, "Allocating read and write structures");
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
     read_ptr =
        png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
        NULL, NULL, NULL,
        (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
  #else
     read_ptr =
        png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  #endif
  #ifndef PNG_STDIO_SUPPORTED
     png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error,
         pngtest_warning);
  #endif
  
  #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
     user_chunk_data[0] = 0;
     user_chunk_data[1] = 0;
     user_chunk_data[2] = 0;
     user_chunk_data[3] = 0;
     png_set_read_user_chunk_fn(read_ptr, user_chunk_data,
       read_user_chunk_callback);
  
  #endif
  #ifdef PNG_WRITE_SUPPORTED
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
     write_ptr =
        png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
        NULL, NULL, NULL, png_debug_malloc, png_debug_free);
  #else
     write_ptr =
        png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  #endif
  #ifndef PNG_STDIO_SUPPORTED
     png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error,
         pngtest_warning);
  #endif
  #endif
     png_debug(0, "Allocating read_info, write_info and end_info structures");
     read_info_ptr = png_create_info_struct(read_ptr);
     end_info_ptr = png_create_info_struct(read_ptr);
  #ifdef PNG_WRITE_SUPPORTED
     write_info_ptr = png_create_info_struct(write_ptr);
     write_end_info_ptr = png_create_info_struct(write_ptr);
  #endif
  
  #ifdef PNG_SETJMP_SUPPORTED
     png_debug(0, "Setting jmpbuf for read struct");
  #ifdef USE_FAR_KEYWORD
     if (setjmp(jmpbuf))
  #else
     if (setjmp(png_jmpbuf(read_ptr)))
  #endif
     {
        fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
        png_free(read_ptr, row_buf);
        row_buf = NULL;
        png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
  #ifdef PNG_WRITE_SUPPORTED
        png_destroy_info_struct(write_ptr, &write_end_info_ptr);
        png_destroy_write_struct(&write_ptr, &write_info_ptr);
  #endif
        FCLOSE(fpin);
        FCLOSE(fpout);
        return (1);
     }
  #ifdef USE_FAR_KEYWORD
     png_memcpy(png_jmpbuf(read_ptr), jmpbuf, png_sizeof(jmp_buf));
  #endif
  
  #ifdef PNG_WRITE_SUPPORTED
     png_debug(0, "Setting jmpbuf for write struct");
  #ifdef USE_FAR_KEYWORD
     if (setjmp(jmpbuf))
  #else
     if (setjmp(png_jmpbuf(write_ptr)))
  #endif
     {
        fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
        png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
        png_destroy_info_struct(write_ptr, &write_end_info_ptr);
  #ifdef PNG_WRITE_SUPPORTED
        png_destroy_write_struct(&write_ptr, &write_info_ptr);
  #endif
        FCLOSE(fpin);
        FCLOSE(fpout);
        return (1);
     }
  #ifdef USE_FAR_KEYWORD
     png_memcpy(png_jmpbuf(write_ptr), jmpbuf, png_sizeof(jmp_buf));
  #endif
  #endif
  #endif
  
     png_debug(0, "Initializing input and output streams");
  #ifdef PNG_STDIO_SUPPORTED
     png_init_io(read_ptr, fpin);
  #  ifdef PNG_WRITE_SUPPORTED
     png_init_io(write_ptr, fpout);
  #  endif
  #else
     png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
  #  ifdef PNG_WRITE_SUPPORTED
     png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
  #    ifdef PNG_WRITE_FLUSH_SUPPORTED
        pngtest_flush);
  #    else
        NULL);
  #    endif
  #  endif
  #endif
     if (status_dots_requested == 1)
     {
  #ifdef PNG_WRITE_SUPPORTED
        png_set_write_status_fn(write_ptr, write_row_callback);
  #endif
        png_set_read_status_fn(read_ptr, read_row_callback);
     }
     else
     {
  #ifdef PNG_WRITE_SUPPORTED
        png_set_write_status_fn(write_ptr, NULL);
  #endif
        png_set_read_status_fn(read_ptr, NULL);
     }
  
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
     {
        int i;
        for (i = 0; i<256; i++)
           filters_used[i] = 0;
        png_set_read_user_transform_fn(read_ptr, count_filters);
     }
  #endif
  #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
     zero_samples = 0;
     png_set_write_user_transform_fn(write_ptr, count_zero_samples);
  #endif
  
  #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
  #  ifndef PNG_HANDLE_CHUNK_ALWAYS
  #    define PNG_HANDLE_CHUNK_ALWAYS       3
  #  endif
     png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
        NULL, 0);
  #endif
  #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
  #  ifndef PNG_HANDLE_CHUNK_IF_SAFE
  #    define PNG_HANDLE_CHUNK_IF_SAFE      2
  #  endif
     png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_IF_SAFE,
        NULL, 0);
  #endif
  
     png_debug(0, "Reading info struct");
     png_read_info(read_ptr, read_info_ptr);
  
     png_debug(0, "Transferring info struct");
     {
        int interlace_type, compression_type, filter_type;
  
        if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
            &color_type, &interlace_type, &compression_type, &filter_type))
        {
           png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
  #ifdef PNG_WRITE_INTERLACING_SUPPORTED
              color_type, interlace_type, compression_type, filter_type);
  #else
              color_type, PNG_INTERLACE_NONE, compression_type, filter_type);
  #endif
        }
     }
  #ifdef PNG_FIXED_POINT_SUPPORTED
  #ifdef PNG_cHRM_SUPPORTED
     {
        png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
           blue_y;
        if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
           &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y))
        {
           png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
              red_y, green_x, green_y, blue_x, blue_y);
        }
     }
  #endif
  #ifdef PNG_gAMA_SUPPORTED
     {
        png_fixed_point gamma;
  
        if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
           png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
     }
  #endif
  #else /* Use floating point versions */
  #ifdef PNG_FLOATING_POINT_SUPPORTED
  #ifdef PNG_cHRM_SUPPORTED
     {
        double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
           blue_y;
        if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
           &red_y, &green_x, &green_y, &blue_x, &blue_y))
        {
           png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
              red_y, green_x, green_y, blue_x, blue_y);
        }
     }
  #endif
  #ifdef PNG_gAMA_SUPPORTED
     {
        double gamma;
  
        if (png_get_gAMA(read_ptr, read_info_ptr, &gamma))
           png_set_gAMA(write_ptr, write_info_ptr, gamma);
     }
  #endif
  #endif /* Floating point */
  #endif /* Fixed point */
  #ifdef PNG_iCCP_SUPPORTED
     {
        png_charp name;
        png_charp profile;
        png_uint_32 proflen;
        int compression_type;
  
        if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
                        &profile, &proflen))
        {
           png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
                        profile, proflen);
        }
     }
  #endif
  #ifdef PNG_sRGB_SUPPORTED
     {
        int intent;
  
        if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
           png_set_sRGB(write_ptr, write_info_ptr, intent);
     }
  #endif
     {
        png_colorp palette;
        int num_palette;
  
        if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
           png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
     }
  #ifdef PNG_bKGD_SUPPORTED
     {
        png_color_16p background;
  
        if (png_get_bKGD(read_ptr, read_info_ptr, &background))
        {
           png_set_bKGD(write_ptr, write_info_ptr, background);
        }
     }
  #endif
  #ifdef PNG_hIST_SUPPORTED
     {
        png_uint_16p hist;
  
        if (png_get_hIST(read_ptr, read_info_ptr, &hist))
           png_set_hIST(write_ptr, write_info_ptr, hist);
     }
  #endif
  #ifdef PNG_oFFs_SUPPORTED
     {
        png_int_32 offset_x, offset_y;
        int unit_type;
  
        if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
            &unit_type))
        {
           png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
        }
     }
  #endif
  #ifdef PNG_pCAL_SUPPORTED
     {
        png_charp purpose, units;
        png_charpp params;
        png_int_32 X0, X1;
        int type, nparams;
  
        if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
           &nparams, &units, &params))
        {
           png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
              nparams, units, params);
        }
     }
  #endif
  #ifdef PNG_pHYs_SUPPORTED
     {
        png_uint_32 res_x, res_y;
        int unit_type;
  
        if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y, &unit_type))
           png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
     }
  #endif
  #ifdef PNG_sBIT_SUPPORTED
     {
        png_color_8p sig_bit;
  
        if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
           png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
     }
  #endif
  #ifdef PNG_sCAL_SUPPORTED
  #ifdef PNG_FLOATING_POINT_SUPPORTED
     {
        int unit;
        double scal_width, scal_height;
  
        if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
           &scal_height))
        {
           png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
        }
     }
  #else
  #ifdef PNG_FIXED_POINT_SUPPORTED
     {
        int unit;
        png_charp scal_width, scal_height;
  
        if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
            &scal_height))
        {
           png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
               scal_height);
        }
     }
  #endif
  #endif
  #endif
  #ifdef PNG_TEXT_SUPPORTED
     {
        png_textp text_ptr;
        int num_text;
  
        if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
        {
           png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text);
           png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
        }
     }
  #endif
  #ifdef PNG_tIME_SUPPORTED
     {
        png_timep mod_time;
  
        if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))
        {
           png_set_tIME(write_ptr, write_info_ptr, mod_time);
  #ifdef PNG_TIME_RFC1123_SUPPORTED
           /* We have to use png_memcpy instead of "=" because the string
            * pointed to by png_convert_to_rfc1123() gets free'ed before
            * we use it.
            */
           png_memcpy(tIME_string,
                      png_convert_to_rfc1123(read_ptr, mod_time),
                      png_sizeof(tIME_string));
           tIME_string[png_sizeof(tIME_string) - 1] = '\0';
           tIME_chunk_present++;
  #endif /* PNG_TIME_RFC1123_SUPPORTED */
        }
     }
  #endif
  #ifdef PNG_tRNS_SUPPORTED
     {
        png_bytep trans_alpha;
        int num_trans;
        png_color_16p trans_color;
  
        if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
           &trans_color))
        {
           int sample_max = (1 << bit_depth);
           /* libpng doesn't reject a tRNS chunk with out-of-range samples */
           if (!((color_type == PNG_COLOR_TYPE_GRAY &&
               (int)trans_color->gray > sample_max) ||
               (color_type == PNG_COLOR_TYPE_RGB &&
               ((int)trans_color->red > sample_max ||
               (int)trans_color->green > sample_max ||
               (int)trans_color->blue > sample_max))))
              png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
                 trans_color);
        }
     }
  #endif
  #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
     {
        png_unknown_chunkp unknowns;
        int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
           &unknowns);
        if (num_unknowns)
        {
           png_size_t i;
           png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
             num_unknowns);
           /* Copy the locations from the read_info_ptr.  The automatically
            * generated locations in write_info_ptr are wrong because we
            * haven't written anything yet.
            */
           for (i = 0; i < (png_size_t)num_unknowns; i++)
             png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
               unknowns[i].location);
        }
     }
  #endif
  
  #ifdef PNG_WRITE_SUPPORTED
     png_debug(0, "Writing info struct");
  
  /* If we wanted, we could write info in two steps:
   * png_write_info_before_PLTE(write_ptr, write_info_ptr);
   */
     png_write_info(write_ptr, write_info_ptr);
  
  #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
     if (user_chunk_data[0] != 0)
     {
        png_byte png_sTER[5] = {115,  84,  69,  82, '\0'};
  
        unsigned char
          ster_chunk_data[1];
  
        if (verbose)
           fprintf(STDERR, "\n stereo mode = %lu\n",
             (unsigned long)(user_chunk_data[0] - 1));
        ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
        png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
     }
     if (user_chunk_data[1] != 0 || user_chunk_data[2] != 0)
     {
        png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
  
        unsigned char
          vpag_chunk_data[9];
  
        if (verbose)
           fprintf(STDERR, " vpAg = %lu x %lu, units = %lu\n",
             (unsigned long)user_chunk_data[1],
             (unsigned long)user_chunk_data[2],
             (unsigned long)user_chunk_data[3]);
        png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
        png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
        vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
        png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
     }
  
  #endif
  #endif
  
  #ifdef SINGLE_ROWBUF_ALLOC
     png_debug(0, "Allocating row buffer...");
     row_buf = (png_bytep)png_malloc(read_ptr,
        png_get_rowbytes(read_ptr, read_info_ptr));
     png_debug1(0, "0x%08lx", (unsigned long)row_buf);
  #endif /* SINGLE_ROWBUF_ALLOC */
     png_debug(0, "Writing row data");
  
  #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
    defined(PNG_WRITE_INTERLACING_SUPPORTED)
     num_pass = png_set_interlace_handling(read_ptr);
  #  ifdef PNG_WRITE_SUPPORTED
     png_set_interlace_handling(write_ptr);
  #  endif
  #else
     num_pass = 1;
  #endif
  
  #ifdef PNGTEST_TIMING
     t_stop = (float)clock();
     t_misc += (t_stop - t_start);
     t_start = t_stop;
  #endif
     for (pass = 0; pass < num_pass; pass++)
     {
        png_debug1(0, "Writing row data for pass %d", pass);
        for (y = 0; y < height; y++)
        {
  #ifndef SINGLE_ROWBUF_ALLOC
           png_debug2(0, "Allocating row buffer (pass %d, y = %ld)...", pass, y);
           row_buf = (png_bytep)png_malloc(read_ptr,
              png_get_rowbytes(read_ptr, read_info_ptr));
           png_debug2(0, "0x%08lx (%ld bytes)", (unsigned long)row_buf,
              png_get_rowbytes(read_ptr, read_info_ptr));
  #endif /* !SINGLE_ROWBUF_ALLOC */
           png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
  
  #ifdef PNG_WRITE_SUPPORTED
  #ifdef PNGTEST_TIMING
           t_stop = (float)clock();
           t_decode += (t_stop - t_start);
           t_start = t_stop;
  #endif
           png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
  #ifdef PNGTEST_TIMING
           t_stop = (float)clock();
           t_encode += (t_stop - t_start);
           t_start = t_stop;
  #endif
  #endif /* PNG_WRITE_SUPPORTED */
  
  #ifndef SINGLE_ROWBUF_ALLOC
           png_debug2(0, "Freeing row buffer (pass %d, y = %ld)", pass, y);
           png_free(read_ptr, row_buf);
           row_buf = NULL;
  #endif /* !SINGLE_ROWBUF_ALLOC */
        }
     }
  
  #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
     png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
  #endif
  #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
     png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
  #endif
  
     png_debug(0, "Reading and writing end_info data");
  
     png_read_end(read_ptr, end_info_ptr);
  #ifdef PNG_TEXT_SUPPORTED
     {
        png_textp text_ptr;
        int num_text;
  
        if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
        {
           png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text);
           png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
        }
     }
  #endif
  #ifdef PNG_tIME_SUPPORTED
     {
        png_timep mod_time;
  
        if (png_get_tIME(read_ptr, end_info_ptr, &mod_time))
        {
           png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
  #ifdef PNG_TIME_RFC1123_SUPPORTED
           /* We have to use png_memcpy instead of "=" because the string
              pointed to by png_convert_to_rfc1123() gets free'ed before
              we use it */
           png_memcpy(tIME_string,
                      png_convert_to_rfc1123(read_ptr, mod_time),
                      png_sizeof(tIME_string));
           tIME_string[png_sizeof(tIME_string) - 1] = '\0';
           tIME_chunk_present++;
  #endif /* PNG_TIME_RFC1123_SUPPORTED */
        }
     }
  #endif
  #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
     {
        png_unknown_chunkp unknowns;
        int num_unknowns;
        num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
           &unknowns);
        if (num_unknowns)
        {
           png_size_t i;
           png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
             num_unknowns);
           /* Copy the locations from the read_info_ptr.  The automatically
            * generated locations in write_end_info_ptr are wrong because we
            * haven't written the end_info yet.
            */
           for (i = 0; i < (png_size_t)num_unknowns; i++)
             png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
               unknowns[i].location);
        }
     }
  #endif
  #ifdef PNG_WRITE_SUPPORTED
     png_write_end(write_ptr, write_end_info_ptr);
  #endif
  
  #ifdef PNG_EASY_ACCESS_SUPPORTED
     if (verbose)
     {
        png_uint_32 iwidth, iheight;
        iwidth = png_get_image_width(write_ptr, write_info_ptr);
        iheight = png_get_image_height(write_ptr, write_info_ptr);
        fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
           (unsigned long)iwidth, (unsigned long)iheight);
     }
  #endif
  
     png_debug(0, "Destroying data structs");
  #ifdef SINGLE_ROWBUF_ALLOC
     png_debug(1, "destroying row_buf for read_ptr");
     png_free(read_ptr, row_buf);
     row_buf = NULL;
  #endif /* SINGLE_ROWBUF_ALLOC */
     png_debug(1, "destroying read_ptr, read_info_ptr, end_info_ptr");
     png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
  #ifdef PNG_WRITE_SUPPORTED
     png_debug(1, "destroying write_end_info_ptr");
     png_destroy_info_struct(write_ptr, &write_end_info_ptr);
     png_debug(1, "destroying write_ptr, write_info_ptr");
     png_destroy_write_struct(&write_ptr, &write_info_ptr);
  #endif
     png_debug(0, "Destruction complete.");
  
     FCLOSE(fpin);
     FCLOSE(fpout);
  
     png_debug(0, "Opening files for comparison");
     if ((fpin = fopen(inname, "rb")) == NULL)
     {
        fprintf(STDERR, "Could not find file %s\n", inname);
        return (1);
     }
  
     if ((fpout = fopen(outname, "rb")) == NULL)
     {
        fprintf(STDERR, "Could not find file %s\n", outname);
        FCLOSE(fpin);
        return (1);
     }
  
     for (;;)
     {
        png_size_t num_in, num_out;
  
           num_in = fread(inbuf, 1, 1, fpin);
           num_out = fread(outbuf, 1, 1, fpout);
  
        if (num_in != num_out)
        {
           fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                   inname, outname);
           if (wrote_question == 0)
           {
              fprintf(STDERR,
           "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
                inname, PNG_ZBUF_SIZE);
              fprintf(STDERR,
                "\n   filtering heuristic (libpng default), compression");
              fprintf(STDERR,
                " level (zlib default),\n   and zlib version (%s)?\n\n",
                ZLIB_VERSION);
              wrote_question = 1;
           }
           FCLOSE(fpin);
           FCLOSE(fpout);
           return (0);
        }
  
        if (!num_in)
           break;
  
        if (png_memcmp(inbuf, outbuf, num_in))
        {
           fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname);
           if (wrote_question == 0)
           {
              fprintf(STDERR,
           "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
                   inname, PNG_ZBUF_SIZE);
              fprintf(STDERR,
                "\n   filtering heuristic (libpng default), compression");
              fprintf(STDERR,
                " level (zlib default),\n   and zlib version (%s)?\n\n",
                ZLIB_VERSION);
              wrote_question = 1;
           }
           FCLOSE(fpin);
           FCLOSE(fpout);
           return (0);
        }
     }
  
     FCLOSE(fpin);
     FCLOSE(fpout);
  
     return (0);
  }
  
  /* Input and output filenames */
  #ifdef RISCOS
  static PNG_CONST char *inname = "pngtest/png";
  static PNG_CONST char *outname = "pngout/png";
  #else
  static PNG_CONST char *inname = "pngtest.png";
  static PNG_CONST char *outname = "pngout.png";
  #endif
  
  int
  main(int argc, char *argv[])
  {
     int multiple = 0;
     int ierror = 0;
  
     fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
     fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
     fprintf(STDERR, "%s", png_get_copyright(NULL));
     /* Show the version of libpng used in building the library */
     fprintf(STDERR, " library (%lu):%s",
        (unsigned long)png_access_version_number(),
        png_get_header_version(NULL));
     /* Show the version of libpng used in building the application */
     fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
        PNG_HEADER_VERSION_STRING);
     fprintf(STDERR, " sizeof(png_struct)=%ld, sizeof(png_info)=%ld\n",
                      (long)png_sizeof(png_struct), (long)png_sizeof(png_info));
  
     /* Do some consistency checking on the memory allocation settings, I'm
      * not sure this matters, but it is nice to know, the first of these
      * tests should be impossible because of the way the macros are set
      * in pngconf.h
      */
  #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
        fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
  #endif
     /* I think the following can happen. */
  #if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
        fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
  #endif
  
     if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
     {
        fprintf(STDERR,
           "Warning: versions are different between png.h and png.c\n");
        fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
        fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
        ++ierror;
     }
  
     if (argc > 1)
     {
        if (strcmp(argv[1], "-m") == 0)
        {
           multiple = 1;
           status_dots_requested = 0;
        }
        else if (strcmp(argv[1], "-mv") == 0 ||
                 strcmp(argv[1], "-vm") == 0 )
        {
           multiple = 1;
           verbose = 1;
           status_dots_requested = 1;
        }
        else if (strcmp(argv[1], "-v") == 0)
        {
           verbose = 1;
           status_dots_requested = 1;
           inname = argv[2];
        }
        else
        {
           inname = argv[1];
           status_dots_requested = 0;
        }
     }
  
     if (!multiple && argc == 3 + verbose)
       outname = argv[2 + verbose];
  
     if ((!multiple && argc > 3 + verbose) || (multiple && argc < 2))
     {
       fprintf(STDERR,
         "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
          argv[0], argv[0]);
       fprintf(STDERR,
         "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
       fprintf(STDERR,
         "  with -m %s is used as a temporary file\n", outname);
       exit(1);
     }
  
     if (multiple)
     {
        int i;
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
        int allocation_now = current_allocation;
  #endif
        for (i=2; i<argc; ++i)
        {
           int kerror;
           fprintf(STDERR, "\n Testing %s:", argv[i]);
           kerror = test_one_file(argv[i], outname);
           if (kerror == 0)
           {
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
              int k;
  #endif
  #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
              fprintf(STDERR, "\n PASS (%lu zero samples)\n",
                 (unsigned long)zero_samples);
  #else
              fprintf(STDERR, " PASS\n");
  #endif
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
              for (k = 0; k<256; k++)
                 if (filters_used[k])
                    fprintf(STDERR, " Filter %d was used %lu times\n",
                       k, (unsigned long)filters_used[k]);
  #endif
  #ifdef PNG_TIME_RFC1123_SUPPORTED
           if (tIME_chunk_present != 0)
              fprintf(STDERR, " tIME = %s\n", tIME_string);
           tIME_chunk_present = 0;
  #endif /* PNG_TIME_RFC1123_SUPPORTED */
           }
           else
           {
              fprintf(STDERR, " FAIL\n");
              ierror += kerror;
           }
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
           if (allocation_now != current_allocation)
              fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
                 current_allocation - allocation_now);
           if (current_allocation != 0)
           {
              memory_infop pinfo = pinformation;
  
              fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                 current_allocation);
              while (pinfo != NULL)
              {
                 fprintf(STDERR, " %lu bytes at %x\n",
                   (unsigned long)pinfo->size,
                   (unsigned int) pinfo->pointer);
                 pinfo = pinfo->next;
              }
           }
  #endif
        }
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
           fprintf(STDERR, " Current memory allocation: %10d bytes\n",
              current_allocation);
           fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
              maximum_allocation);
           fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
              total_allocation);
           fprintf(STDERR, "     Number of allocations: %10d\n",
              num_allocations);
  #endif
     }
     else
     {
        int i;
        for (i = 0; i<3; ++i)
        {
           int kerror;
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
           int allocation_now = current_allocation;
  #endif
           if (i == 1) status_dots_requested = 1;
           else if (verbose == 0)status_dots_requested = 0;
           if (i == 0 || verbose == 1 || ierror != 0)
              fprintf(STDERR, "\n Testing %s:", inname);
           kerror = test_one_file(inname, outname);
           if (kerror == 0)
           {
              if (verbose == 1 || i == 2)
              {
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
                  int k;
  #endif
  #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
                  fprintf(STDERR, "\n PASS (%lu zero samples)\n",
                     (unsigned long)zero_samples);
  #else
                  fprintf(STDERR, " PASS\n");
  #endif
  #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
                  for (k = 0; k<256; k++)
                     if (filters_used[k])
                        fprintf(STDERR, " Filter %d was used %lu times\n",
                           k, (unsigned long)filters_used[k]);
  #endif
  #ifdef PNG_TIME_RFC1123_SUPPORTED
               if (tIME_chunk_present != 0)
                  fprintf(STDERR, " tIME = %s\n", tIME_string);
  #endif /* PNG_TIME_RFC1123_SUPPORTED */
              }
           }
           else
           {
              if (verbose == 0 && i != 2)
                 fprintf(STDERR, "\n Testing %s:", inname);
              fprintf(STDERR, " FAIL\n");
              ierror += kerror;
           }
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
           if (allocation_now != current_allocation)
               fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
                 current_allocation - allocation_now);
           if (current_allocation != 0)
           {
               memory_infop pinfo = pinformation;
  
               fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                  current_allocation);
               while (pinfo != NULL)
               {
                  fprintf(STDERR, " %lu bytes at %x\n",
                     (unsigned long)pinfo->size, (unsigned int)pinfo->pointer);
                  pinfo = pinfo->next;
               }
            }
  #endif
         }
  #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         fprintf(STDERR, " Current memory allocation: %10d bytes\n",
            current_allocation);
         fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
            maximum_allocation);
         fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
            total_allocation);
         fprintf(STDERR, "     Number of allocations: %10d\n",
              num_allocations);
  #endif
     }
  
  #ifdef PNGTEST_TIMING
     t_stop = (float)clock();
     t_misc += (t_stop - t_start);
     t_start = t_stop;
     fprintf(STDERR, " CPU time used = %.3f seconds",
        (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
     fprintf(STDERR, " (decoding %.3f,\n",
        t_decode/(float)CLOCKS_PER_SEC);
     fprintf(STDERR, "        encoding %.3f ,",
        t_encode/(float)CLOCKS_PER_SEC);
     fprintf(STDERR, " other %.3f seconds)\n\n",
        t_misc/(float)CLOCKS_PER_SEC);
  #endif
  
     if (ierror == 0)
        fprintf(STDERR, " libpng passes test\n");
     else
        fprintf(STDERR, " libpng FAILS test\n");
     return (int)(ierror != 0);
  }
  
  /* Generate a compiler error if there is an old png.h in the search path. */
  typedef version_1_4_4 your_png_h_is_not_version_1_4_4;
  