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40 results

pngtest.c

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    pngtest.c 65.42 KiB
    
    /* pngtest.c - a simple test program to test libpng
     *
     * Copyright (c) 2018-2019 Cosmin Truta
     * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
     * Copyright (c) 1996-1997 Andreas Dilger
     * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
     *
     * This code is released under the libpng license.
     * For conditions of distribution and use, see the disclaimer
     * and license in png.h
     *
     * This program reads in a PNG image, writes it out again, and then
     * compares the two files.  If the files are identical, this shows that
     * the basic chunk handling, filtering, and (de)compression code is working
     * properly.  It does not currently test all of the transforms, although
     * it probably should.
     *
     * The program will report "FAIL" in certain legitimate cases:
     * 1) when the compression level or filter selection method is changed.
     * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
     * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
     *    exist in the input file.
     * 4) others not listed here...
     * In these cases, it is best to check with another tool such as "pngcheck"
     * to see what the differences between the two files are.
     *
     * If a filename is given on the command-line, then this file is used
     * for the input, rather than the default "pngtest.png".  This allows
     * testing a wide variety of files easily.  You can also test a number
     * of files at once by typing "pngtest -m file1.png file2.png ..."
     */
    
    #define _POSIX_SOURCE 1
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    
    /* Defined so I can write to a file on gui/windowing platforms */
    /*  #define STDERR stderr  */
    #define STDERR stdout   /* For DOS */
    
    #include "png.h"
    
    /* Known chunks that exist in pngtest.png must be supported or pngtest will fail
     * simply as a result of re-ordering them.  This may be fixed in 1.7
     *
     * pngtest allocates a single row buffer for each row and overwrites it,
     * therefore if the write side doesn't support the writing of interlaced images
     * nothing can be done for an interlaced image (and the code below will fail
     * horribly trying to write extra data after writing garbage).
     */
    #if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
       defined PNG_READ_bKGD_SUPPORTED &&\
       defined PNG_READ_cHRM_SUPPORTED &&\
       defined PNG_READ_gAMA_SUPPORTED &&\
       defined PNG_READ_oFFs_SUPPORTED &&\
       defined PNG_READ_pCAL_SUPPORTED &&\
       defined PNG_READ_pHYs_SUPPORTED &&\
       defined PNG_READ_sBIT_SUPPORTED &&\
       defined PNG_READ_sCAL_SUPPORTED &&\
       defined PNG_READ_sRGB_SUPPORTED &&\
       defined PNG_READ_sPLT_SUPPORTED &&\
       defined PNG_READ_tEXt_SUPPORTED &&\
       defined PNG_READ_tIME_SUPPORTED &&\
       defined PNG_READ_zTXt_SUPPORTED &&\
       (defined PNG_WRITE_INTERLACING_SUPPORTED || PNG_LIBPNG_VER >= 10700)
    
    #ifdef PNG_ZLIB_HEADER
    #  include PNG_ZLIB_HEADER /* defined by pnglibconf.h from 1.7 */
    #else
    #  include "zlib.h"
    #endif
    
    /* Copied from pngpriv.h but only used in error messages below. */
    #ifndef PNG_ZBUF_SIZE
    #  define PNG_ZBUF_SIZE 8192
    #endif
    #define FCLOSE(file) fclose(file)
    
    #ifndef PNG_STDIO_SUPPORTED
    typedef FILE                * png_FILE_p;
    #endif
    
    /* Makes pngtest verbose so we can find problems. */
    #ifndef PNG_DEBUG
    #  define PNG_DEBUG 0
    #endif
    
    #if PNG_DEBUG > 1
    #  define pngtest_debug(m)        ((void)fprintf(stderr, m "\n"))
    #  define pngtest_debug1(m,p1)    ((void)fprintf(stderr, m "\n", p1))
    #  define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2))
    #else
    #  define pngtest_debug(m)        ((void)0)
    #  define pngtest_debug1(m,p1)    ((void)0)
    #  define pngtest_debug2(m,p1,p2) ((void)0)
    #endif
    
    #if !PNG_DEBUG
    #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
    #endif
    
    #ifndef PNG_UNUSED
    #  define PNG_UNUSED(param) (void)param;
    #endif
    
    /* Turn on CPU timing
    #define PNGTEST_TIMING
    */
    
    #ifndef PNG_FLOATING_POINT_SUPPORTED
    #undef PNGTEST_TIMING
    #endif
    
    #ifdef PNGTEST_TIMING
    static float t_start, t_stop, t_decode, t_encode, t_misc;
    #include <time.h>
    #endif
    
    #ifdef PNG_TIME_RFC1123_SUPPORTED
    #define PNG_tIME_STRING_LENGTH 29
    static int tIME_chunk_present = 0;
    static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
    
    #if PNG_LIBPNG_VER < 10619
    #define png_convert_to_rfc1123_buffer(ts, t) tIME_to_str(read_ptr, ts, t)
    
    static int
    tIME_to_str(png_structp png_ptr, png_charp ts, png_const_timep t)
    {
       png_const_charp str = png_convert_to_rfc1123(png_ptr, t);
    
       if (str == NULL)
           return 0;
    
       strcpy(ts, str);
       return 1;
    }
    #endif /* older libpng */
    #endif
    
    static int verbose = 0;
    static int strict = 0;
    static int relaxed = 0;
    static int xfail = 0;
    static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
    static int error_count = 0; /* count calls to png_error */
    static int warning_count = 0; /* count calls to png_warning */
    
    /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
    #ifndef png_jmpbuf
    #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
    #endif
    
    /* Defines for unknown chunk handling if required. */
    #ifndef PNG_HANDLE_CHUNK_ALWAYS
    #  define PNG_HANDLE_CHUNK_ALWAYS       3
    #endif
    #ifndef PNG_HANDLE_CHUNK_IF_SAFE
    #  define PNG_HANDLE_CHUNK_IF_SAFE      2
    #endif
    
    /* Utility to save typing/errors, the argument must be a name */
    #define MEMZERO(var) ((void)memset(&var, 0, sizeof var))
    
    /* Example of using row callbacks to make a simple progress meter */
    static int status_pass = 1;
    static int status_dots_requested = 0;
    static int status_dots = 1;
    
    static void PNGCBAPI
    read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
    {
       if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
          return;
    
       if (status_pass != pass)
       {
          fprintf(stdout, "\n Pass %d: ", pass);
          status_pass = pass;
          status_dots = 31;
       }
    
       status_dots--;
    
       if (status_dots == 0)
       {
          fprintf(stdout, "\n         ");
          status_dots=30;
       }
    
       fprintf(stdout, "r");
    }
    
    #ifdef PNG_WRITE_SUPPORTED
    static void PNGCBAPI
    write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
    {
       if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
          return;
    
       fprintf(stdout, "w");
    }
    #endif
    
    
    #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
    /* Example of using a user transform callback (doesn't do anything at present).
     */
    static void PNGCBAPI
    read_user_callback(png_structp png_ptr, png_row_infop row_info, png_bytep data)
    {
       PNG_UNUSED(png_ptr)
       PNG_UNUSED(row_info)
       PNG_UNUSED(data)
    }
    #endif
    
    #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
    /* Example of using user transform callback (we don't transform anything,
     * but merely count the zero samples)
     */
    
    static png_uint_32 zero_samples;
    
    static void PNGCBAPI
    count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
    {
       png_bytep dp = data;
       if (png_ptr == NULL)
          return;
    
       /* Contents of row_info:
        *  png_uint_32 width      width of row
        *  png_uint_32 rowbytes   number of bytes in row
        *  png_byte color_type    color type of pixels
        *  png_byte bit_depth     bit depth of samples
        *  png_byte channels      number of channels (1-4)
        *  png_byte pixel_depth   bits per pixel (depth*channels)
        */
    
       /* Counts the number of zero samples (or zero pixels if color_type is 3 */
    
       if (row_info->color_type == 0 || row_info->color_type == 3)
       {
          int pos = 0;
          png_uint_32 n, nstop;
    
          for (n = 0, nstop=row_info->width; n<nstop; n++)
          {
             if (row_info->bit_depth == 1)
             {
                if (((*dp << pos++ ) & 0x80) == 0)
                   zero_samples++;
    
                if (pos == 8)
                {
                   pos = 0;
                   dp++;
                }
             }
    
             if (row_info->bit_depth == 2)
             {
                if (((*dp << (pos+=2)) & 0xc0) == 0)
                   zero_samples++;
    
                if (pos == 8)
                {
                   pos = 0;
                   dp++;
                }
             }
    
             if (row_info->bit_depth == 4)
             {
                if (((*dp << (pos+=4)) & 0xf0) == 0)
                   zero_samples++;
    
                if (pos == 8)
                {
                   pos = 0;
                   dp++;
                }
             }
    
             if (row_info->bit_depth == 8)
                if (*dp++ == 0)
                   zero_samples++;
    
             if (row_info->bit_depth == 16)
             {
                if ((*dp | *(dp+1)) == 0)
                   zero_samples++;
                dp+=2;
             }
          }
       }
       else /* Other color types */
       {
          png_uint_32 n, nstop;
          int channel;
          int color_channels = row_info->channels;
          if (row_info->color_type > 3)
             color_channels--;
    
          for (n = 0, nstop=row_info->width; n<nstop; n++)
          {
             for (channel = 0; channel < color_channels; channel++)
             {
                if (row_info->bit_depth == 8)
                   if (*dp++ == 0)
                      zero_samples++;
    
                if (row_info->bit_depth == 16)
                {
                   if ((*dp | *(dp+1)) == 0)
                      zero_samples++;
    
                   dp+=2;
                }
             }
             if (row_info->color_type > 3)
             {
                dp++;
                if (row_info->bit_depth == 16)
                   dp++;
             }
          }
       }
    }
    #endif /* WRITE_USER_TRANSFORM */
    
    #ifndef PNG_STDIO_SUPPORTED
    /* START of code to validate stdio-free compilation */
    /* These copies of the default read/write functions come from pngrio.c and
     * pngwio.c.  They allow "don't include stdio" testing of the library.
     * This is the function that does the actual reading of data.  If you are
     * not reading from a standard C stream, you should create a replacement
     * read_data function and use it at run time with png_set_read_fn(), rather
     * than changing the library.
     */
    
    #ifdef PNG_IO_STATE_SUPPORTED
    void
    pngtest_check_io_state(png_structp png_ptr, size_t data_length,
        png_uint_32 io_op);
    void
    pngtest_check_io_state(png_structp png_ptr, size_t data_length,
        png_uint_32 io_op)
    {
       png_uint_32 io_state = png_get_io_state(png_ptr);
       int err = 0;
    
       /* Check if the current operation (reading / writing) is as expected. */
       if ((io_state & PNG_IO_MASK_OP) != io_op)
          png_error(png_ptr, "Incorrect operation in I/O state");
    
       /* Check if the buffer size specific to the current location
        * (file signature / header / data / crc) is as expected.
        */
       switch (io_state & PNG_IO_MASK_LOC)
       {
       case PNG_IO_SIGNATURE:
          if (data_length > 8)
             err = 1;
          break;
       case PNG_IO_CHUNK_HDR:
          if (data_length != 8)
             err = 1;
          break;
       case PNG_IO_CHUNK_DATA:
          break;  /* no restrictions here */
       case PNG_IO_CHUNK_CRC:
          if (data_length != 4)
             err = 1;
          break;
       default:
          err = 1;  /* uninitialized */
       }
       if (err != 0)
          png_error(png_ptr, "Bad I/O state or buffer size");
    }
    #endif
    
    static void PNGCBAPI
    pngtest_read_data(png_structp png_ptr, png_bytep data, size_t length)
    {
       size_t check = 0;
       png_voidp io_ptr;
    
       /* fread() returns 0 on error, so it is OK to store this in a size_t
        * instead of an int, which is what fread() actually returns.
        */
       io_ptr = png_get_io_ptr(png_ptr);
       if (io_ptr != NULL)
       {
          check = fread(data, 1, length, (png_FILE_p)io_ptr);
       }
    
       if (check != length)
       {
          png_error(png_ptr, "Read Error");
       }
    
    #ifdef PNG_IO_STATE_SUPPORTED
       pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
    #endif
    }
    
    #ifdef PNG_WRITE_FLUSH_SUPPORTED
    static void PNGCBAPI
    pngtest_flush(png_structp png_ptr)
    {
       /* Do nothing; fflush() is said to be just a waste of energy. */
       PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
    }
    #endif
    
    /* This is the function that does the actual writing of data.  If you are
     * not writing to a standard C stream, you should create a replacement
     * write_data function and use it at run time with png_set_write_fn(), rather
     * than changing the library.
     */
    static void PNGCBAPI
    pngtest_write_data(png_structp png_ptr, png_bytep data, size_t length)
    {
       size_t check;
    
       check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
    
       if (check != length)
       {
          png_error(png_ptr, "Write Error");
       }
    
    #ifdef PNG_IO_STATE_SUPPORTED
       pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
    #endif
    }
    #endif /* !STDIO */
    
    /* This function is called when there is a warning, but the library thinks
     * it can continue anyway.  Replacement functions don't have to do anything
     * here if you don't want to.  In the default configuration, png_ptr is
     * not used, but it is passed in case it may be useful.
     */
    typedef struct
    {
       const char *file_name;
    }  pngtest_error_parameters;
    
    static void PNGCBAPI
    pngtest_warning(png_structp png_ptr, png_const_charp message)
    {
       const char *name = "UNKNOWN (ERROR!)";
       pngtest_error_parameters *test =
          (pngtest_error_parameters*)png_get_error_ptr(png_ptr);
    
       ++warning_count;
    
       if (test != NULL && test->file_name != NULL)
          name = test->file_name;
    
       fprintf(STDERR, "\n%s: libpng warning: %s\n", name, message);
    }
    
    /* This is the default error handling function.  Note that replacements for
     * this function MUST NOT RETURN, or the program will likely crash.  This
     * function is used by default, or if the program supplies NULL for the
     * error function pointer in png_set_error_fn().
     */
    static void PNGCBAPI
    pngtest_error(png_structp png_ptr, png_const_charp message)
    {
       ++error_count;
    
       pngtest_warning(png_ptr, message);
       /* We can return because png_error calls the default handler, which is
        * actually OK in this case.
        */
    }
    
    /* END of code to validate stdio-free compilation */
    
    /* START of code to validate memory allocation and deallocation */
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
    
    /* Allocate memory.  For reasonable files, size should never exceed
     * 64K.  However, zlib may allocate more than 64K if you don't tell
     * it not to.  See zconf.h and png.h for more information.  zlib does
     * need to allocate exactly 64K, so whatever you call here must
     * have the ability to do that.
     *
     * This piece of code can be compiled to validate max 64K allocations
     * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
     */
    typedef struct memory_information
    {
       png_alloc_size_t          size;
       png_voidp                 pointer;
       struct memory_information *next;
    } memory_information;
    typedef memory_information *memory_infop;
    
    static memory_infop pinformation = NULL;
    static int current_allocation = 0;
    static int maximum_allocation = 0;
    static int total_allocation = 0;
    static int num_allocations = 0;
    
    png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr,
        png_alloc_size_t size));
    void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
    
    png_voidp
    PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
    {
    
       /* png_malloc has already tested for NULL; png_create_struct calls
        * png_debug_malloc directly, with png_ptr == NULL which is OK
        */
    
       if (size == 0)
          return (NULL);
    
       /* This calls the library allocator twice, once to get the requested
          buffer and once to get a new free list entry. */
       {
          /* Disable malloc_fn and free_fn */
          memory_infop pinfo;
          png_set_mem_fn(png_ptr, NULL, NULL, NULL);
          pinfo = (memory_infop)png_malloc(png_ptr,
              (sizeof *pinfo));
          pinfo->size = size;
          current_allocation += size;
          total_allocation += size;
          num_allocations ++;
    
          if (current_allocation > maximum_allocation)
             maximum_allocation = current_allocation;
    
          pinfo->pointer = png_malloc(png_ptr, size);
          /* Restore malloc_fn and free_fn */
    
          png_set_mem_fn(png_ptr,
              NULL, png_debug_malloc, png_debug_free);
    
          if (size != 0 && pinfo->pointer == NULL)
          {
             current_allocation -= size;
             total_allocation -= size;
             png_error(png_ptr,
               "out of memory in pngtest->png_debug_malloc");
          }
    
          pinfo->next = pinformation;
          pinformation = pinfo;
          /* Make sure the caller isn't assuming zeroed memory. */
          memset(pinfo->pointer, 0xdd, pinfo->size);
    
          if (verbose != 0)
             printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
                 pinfo->pointer);
    
          return (png_voidp)(pinfo->pointer);
       }
    }
    
    /* Free a pointer.  It is removed from the list at the same time. */
    void PNGCBAPI
    png_debug_free(png_structp png_ptr, png_voidp ptr)
    {
       if (png_ptr == NULL)
          fprintf(STDERR, "NULL pointer to png_debug_free.\n");
    
       if (ptr == 0)
       {
    #if 0 /* This happens all the time. */
          fprintf(STDERR, "WARNING: freeing NULL pointer\n");
    #endif
          return;
       }
    
       /* Unlink the element from the list. */
       if (pinformation != NULL)
       {
          memory_infop *ppinfo = &pinformation;
    
          for (;;)
          {
             memory_infop pinfo = *ppinfo;
    
             if (pinfo->pointer == ptr)
             {
                *ppinfo = pinfo->next;
                current_allocation -= pinfo->size;
                if (current_allocation < 0)
                   fprintf(STDERR, "Duplicate free of memory\n");
                /* We must free the list element too, but first kill
                   the memory that is to be freed. */
                memset(ptr, 0x55, pinfo->size);
                free(pinfo);
                pinfo = NULL;
                break;
             }
    
             if (pinfo->next == NULL)
             {
                fprintf(STDERR, "Pointer %p not found\n", ptr);
                break;
             }
    
             ppinfo = &pinfo->next;
          }
       }
    
       /* Finally free the data. */
       if (verbose != 0)
          printf("Freeing %p\n", ptr);
    
       if (ptr != NULL)
          free(ptr);
       ptr = NULL;
    }
    #endif /* USER_MEM && DEBUG */
    /* END of code to test memory allocation/deallocation */
    
    
    #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
    /* Demonstration of user chunk support of the sTER and vpAg chunks */
    
    /* (sTER is a public chunk not yet known by libpng.  vpAg is a private
    chunk used in ImageMagick to store "virtual page" size).  */
    
    static struct user_chunk_data
    {
       png_const_infop info_ptr;
       png_uint_32     vpAg_width, vpAg_height;
       png_byte        vpAg_units;
       png_byte        sTER_mode;
       int             location[2];
    }
    user_chunk_data;
    
    /* Used for location and order; zero means nothing. */
    #define have_sTER   0x01
    #define have_vpAg   0x02
    #define before_PLTE 0x10
    #define before_IDAT 0x20
    #define after_IDAT  0x40
    
    static void
    init_callback_info(png_const_infop info_ptr)
    {
       MEMZERO(user_chunk_data);
       user_chunk_data.info_ptr = info_ptr;
    }
    
    static int
    set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
    {
       int location;
    
       if ((data->location[0] & what) != 0 || (data->location[1] & what) != 0)
          return 0; /* already have one of these */
    
       /* Find where we are (the code below zeroes info_ptr to indicate that the
        * chunks before the first IDAT have been read.)
        */
       if (data->info_ptr == NULL) /* after IDAT */
          location = what | after_IDAT;
    
       else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE) != 0)
          location = what | before_IDAT;
    
       else
          location = what | before_PLTE;
    
       if (data->location[0] == 0)
          data->location[0] = location;
    
       else
          data->location[1] = location;
    
       return 1; /* handled */
    }
    
    static int PNGCBAPI
    read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk)
    {
       struct user_chunk_data *my_user_chunk_data =
          (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
    
       if (my_user_chunk_data == NULL)
          png_error(png_ptr, "lost user chunk pointer");
    
       /* Return one of the following:
        *    return (-n);  chunk had an error
        *    return (0);  did not recognize
        *    return (n);  success
        *
        * The unknown chunk structure contains the chunk data:
        * png_byte name[5];
        * png_byte *data;
        * size_t size;
        *
        * Note that libpng has already taken care of the CRC handling.
        */
    
       if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
           chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
          {
             /* Found sTER chunk */
             if (chunk->size != 1)
                return (-1); /* Error return */
    
             if (chunk->data[0] != 0 && chunk->data[0] != 1)
                return (-1);  /* Invalid mode */
    
             if (set_location(png_ptr, my_user_chunk_data, have_sTER) != 0)
             {
                my_user_chunk_data->sTER_mode=chunk->data[0];
                return (1);
             }
    
             else
                return (0); /* duplicate sTER - give it to libpng */
          }
    
       if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
           chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
          return (0); /* Did not recognize */
    
       /* Found ImageMagick vpAg chunk */
    
       if (chunk->size != 9)
          return (-1); /* Error return */
    
       if (set_location(png_ptr, my_user_chunk_data, have_vpAg) == 0)
          return (0);  /* duplicate vpAg */
    
       my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data);
       my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4);
       my_user_chunk_data->vpAg_units = chunk->data[8];
    
       return (1);
    }
    
    #ifdef PNG_WRITE_SUPPORTED
    static void
    write_sTER_chunk(png_structp write_ptr)
    {
       png_byte sTER[5] = {115,  84,  69,  82, '\0'};
    
       if (verbose != 0)
          fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
    
       png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
    }
    
    static void
    write_vpAg_chunk(png_structp write_ptr)
    {
       png_byte vpAg[5] = {118, 112,  65, 103, '\0'};
    
       png_byte vpag_chunk_data[9];
    
       if (verbose != 0)
          fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
              (unsigned long)user_chunk_data.vpAg_width,
              (unsigned long)user_chunk_data.vpAg_height,
              user_chunk_data.vpAg_units);
    
       png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
       png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
       vpag_chunk_data[8] = user_chunk_data.vpAg_units;
       png_write_chunk(write_ptr, vpAg, vpag_chunk_data, 9);
    }
    
    static void
    write_chunks(png_structp write_ptr, int location)
    {
       int i;
    
       /* Notice that this preserves the original chunk order, however chunks
        * intercepted by the callback will be written *after* chunks passed to
        * libpng.  This will actually reverse a pair of sTER chunks or a pair of
        * vpAg chunks, resulting in an error later.  This is not worth worrying
        * about - the chunks should not be duplicated!
        */
       for (i=0; i<2; ++i)
       {
          if (user_chunk_data.location[i] == (location | have_sTER))
             write_sTER_chunk(write_ptr);
    
          else if (user_chunk_data.location[i] == (location | have_vpAg))
             write_vpAg_chunk(write_ptr);
       }
    }
    #endif /* WRITE */
    #else /* !READ_USER_CHUNKS */
    #  define write_chunks(pp,loc) ((void)0)
    #endif
    /* END of code to demonstrate user chunk support */
    
    /* START of code to check that libpng has the required text support; this only
     * checks for the write support because if read support is missing the chunk
     * will simply not be reported back to pngtest.
     */
    #ifdef PNG_TEXT_SUPPORTED
    static void
    pngtest_check_text_support(png_structp png_ptr, png_textp text_ptr,
        int num_text)
    {
       while (num_text > 0)
       {
          switch (text_ptr[--num_text].compression)
          {
             case PNG_TEXT_COMPRESSION_NONE:
                break;
    
             case PNG_TEXT_COMPRESSION_zTXt:
    #           ifndef PNG_WRITE_zTXt_SUPPORTED
                   ++unsupported_chunks;
                   /* In libpng 1.7 this now does an app-error, so stop it: */
                   text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
    #           endif
                break;
    
             case PNG_ITXT_COMPRESSION_NONE:
             case PNG_ITXT_COMPRESSION_zTXt:
    #           ifndef PNG_WRITE_iTXt_SUPPORTED
                   ++unsupported_chunks;
                   text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
    #           endif
                break;
    
             default:
                /* This is an error */
                png_error(png_ptr, "invalid text chunk compression field");
                break;
          }
       }
    }
    #endif
    /* END of code to check that libpng has the required text support */
    
    /* Test one file */
    static int
    test_one_file(const char *inname, const char *outname)
    {
       static png_FILE_p fpin;
       static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
       pngtest_error_parameters error_parameters;
       png_structp read_ptr;
       png_infop read_info_ptr, end_info_ptr;
    #ifdef PNG_WRITE_SUPPORTED
       png_structp write_ptr;
       png_infop write_info_ptr;
       png_infop write_end_info_ptr;
    #ifdef PNG_WRITE_FILTER_SUPPORTED
       int interlace_preserved = 1;
    #endif /* WRITE_FILTER */
    #else /* !WRITE */
       png_structp write_ptr = NULL;
       png_infop write_info_ptr = NULL;
       png_infop write_end_info_ptr = NULL;
    #endif /* !WRITE */
       png_bytep row_buf;
       png_uint_32 y;
       png_uint_32 width, height;
       volatile int num_passes;
       int pass;
       int bit_depth, color_type;
    #ifdef PNG_APNG_SUPPORTED
       png_uint_32 num_frames;
       png_uint_32 num_plays;
    #endif
    
       row_buf = NULL;
       error_parameters.file_name = inname;
    
       if ((fpin = fopen(inname, "rb")) == NULL)
       {
          fprintf(STDERR, "Could not find input file %s\n", inname);
          return (1);
       }
    
       if ((fpout = fopen(outname, "wb")) == NULL)
       {
          fprintf(STDERR, "Could not open output file %s\n", outname);
          FCLOSE(fpin);
          return (1);
       }
    
       pngtest_debug("Allocating read and write structures");
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
       read_ptr =
           png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
           NULL, NULL, NULL, png_debug_malloc, png_debug_free);
    #else
       read_ptr =
           png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    #endif
       png_set_error_fn(read_ptr, &error_parameters, pngtest_error,
           pngtest_warning);
    
    #ifdef PNG_WRITE_SUPPORTED
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
       write_ptr =
           png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
           NULL, NULL, NULL, png_debug_malloc, png_debug_free);
    #else
       write_ptr =
           png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    #endif
       png_set_error_fn(write_ptr, &error_parameters, pngtest_error,
           pngtest_warning);
    #endif
       pngtest_debug("Allocating read_info, write_info and end_info structures");
       read_info_ptr = png_create_info_struct(read_ptr);
       end_info_ptr = png_create_info_struct(read_ptr);
    #ifdef PNG_WRITE_SUPPORTED
       write_info_ptr = png_create_info_struct(write_ptr);
       write_end_info_ptr = png_create_info_struct(write_ptr);
    #endif
    
    #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
       init_callback_info(read_info_ptr);
       png_set_read_user_chunk_fn(read_ptr, &user_chunk_data,
           read_user_chunk_callback);
    #endif
    
    #ifdef PNG_SETJMP_SUPPORTED
       pngtest_debug("Setting jmpbuf for read struct");
       if (setjmp(png_jmpbuf(read_ptr)))
       {
          fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
          png_free(read_ptr, row_buf);
          row_buf = NULL;
          if (verbose != 0)
            fprintf(STDERR, "   destroy read structs\n");
          png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
    #ifdef PNG_WRITE_SUPPORTED
          if (verbose != 0)
            fprintf(STDERR, "   destroy write structs\n");
          png_destroy_info_struct(write_ptr, &write_end_info_ptr);
          png_destroy_write_struct(&write_ptr, &write_info_ptr);
    #endif
          FCLOSE(fpin);
          FCLOSE(fpout);
          return (1);
       }
    
    #ifdef PNG_WRITE_SUPPORTED
       pngtest_debug("Setting jmpbuf for write struct");
    
       if (setjmp(png_jmpbuf(write_ptr)))
       {
          fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
          png_free(read_ptr, row_buf);
          row_buf = NULL;
          if (verbose != 0)
            fprintf(STDERR, "   destroying read structs\n");
          png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
          if (verbose != 0)
            fprintf(STDERR, "   destroying write structs\n");
          png_destroy_info_struct(write_ptr, &write_end_info_ptr);
          png_destroy_write_struct(&write_ptr, &write_info_ptr);
          FCLOSE(fpin);
          FCLOSE(fpout);
          return (1);
       }
    #endif
    #endif
    
    #ifdef PNG_BENIGN_ERRORS_SUPPORTED
       if (strict != 0)
       {
          /* Treat png_benign_error() as errors on read */
          png_set_benign_errors(read_ptr, 0);
    
    # ifdef PNG_WRITE_SUPPORTED
          /* Treat them as errors on write */
          png_set_benign_errors(write_ptr, 0);
    # endif
    
          /* if strict is not set, then app warnings and errors are treated as
           * warnings in release builds, but not in unstable builds; this can be
           * changed with '--relaxed'.
           */
       }
    
       else if (relaxed != 0)
       {
          /* Allow application (pngtest) errors and warnings to pass */
          png_set_benign_errors(read_ptr, 1);
    
          /* Turn off CRC checking while reading */
          png_set_crc_action(read_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
    
    #ifdef PNG_IGNORE_ADLER32
          /* Turn off ADLER32 checking while reading */
          png_set_option(read_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
    #endif
    
    # ifdef PNG_WRITE_SUPPORTED
          png_set_benign_errors(write_ptr, 1);
    # endif
    
       }
    #endif /* BENIGN_ERRORS */
    
       pngtest_debug("Initializing input and output streams");
    #ifdef PNG_STDIO_SUPPORTED
       png_init_io(read_ptr, fpin);
    #  ifdef PNG_WRITE_SUPPORTED
       png_init_io(write_ptr, fpout);
    #  endif
    #else
       png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
    #  ifdef PNG_WRITE_SUPPORTED
       png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
    #    ifdef PNG_WRITE_FLUSH_SUPPORTED
           pngtest_flush);
    #    else
           NULL);
    #    endif
    #  endif
    #endif
    
       if (status_dots_requested == 1)
       {
    #ifdef PNG_WRITE_SUPPORTED
          png_set_write_status_fn(write_ptr, write_row_callback);
    #endif
          png_set_read_status_fn(read_ptr, read_row_callback);
       }
    
       else
       {
    #ifdef PNG_WRITE_SUPPORTED
          png_set_write_status_fn(write_ptr, NULL);
    #endif
          png_set_read_status_fn(read_ptr, NULL);
       }
    
    #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
       png_set_read_user_transform_fn(read_ptr, read_user_callback);
    #endif
    #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
       zero_samples = 0;
       png_set_write_user_transform_fn(write_ptr, count_zero_samples);
    #endif
    
    #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
       /* Preserve all the unknown chunks, if possible.  If this is disabled then,
        * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use
        * libpng to *save* the unknown chunks on read (because we can't switch the
        * save option on!)
        *
        * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all
        * unknown chunks and write will write them all.
        */
    #ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
       png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
           NULL, 0);
    #endif
    #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
       png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
           NULL, 0);
    #endif
    #endif
    
       pngtest_debug("Reading info struct");
       png_read_info(read_ptr, read_info_ptr);
    
    #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
       /* This is a bit of a hack; there is no obvious way in the callback function
        * to determine that the chunks before the first IDAT have been read, so
        * remove the info_ptr (which is only used to determine position relative to
        * PLTE) here to indicate that we are after the IDAT.
        */
       user_chunk_data.info_ptr = NULL;
    #endif
    
       pngtest_debug("Transferring info struct");
       {
          int interlace_type, compression_type, filter_type;
    
          if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
              &color_type, &interlace_type, &compression_type, &filter_type) != 0)
          {
             png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
                 color_type, interlace_type, compression_type, filter_type);
             /* num_passes may not be available below if interlace support is not
              * provided by libpng for both read and write.
              */
             switch (interlace_type)
             {
                case PNG_INTERLACE_NONE:
                   num_passes = 1;
                   break;
    
                case PNG_INTERLACE_ADAM7:
                   num_passes = 7;
                   break;
    
                default:
                   png_error(read_ptr, "invalid interlace type");
                   /*NOT REACHED*/
             }
          }
    
          else
             png_error(read_ptr, "png_get_IHDR failed");
       }
    #ifdef PNG_FIXED_POINT_SUPPORTED
    #ifdef PNG_cHRM_SUPPORTED
       {
          png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
              blue_y;
    
          if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
              &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
          {
             png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
                 red_y, green_x, green_y, blue_x, blue_y);
          }
       }
    #endif
    #ifdef PNG_gAMA_SUPPORTED
       {
          png_fixed_point gamma;
    
          if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma) != 0)
             png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
       }
    #endif
    #else /* Use floating point versions */
    #ifdef PNG_FLOATING_POINT_SUPPORTED
    #ifdef PNG_cHRM_SUPPORTED
       {
          double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
              blue_y;
    
          if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
              &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
          {
             png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
                 red_y, green_x, green_y, blue_x, blue_y);
          }
       }
    #endif
    #ifdef PNG_gAMA_SUPPORTED
       {
          double gamma;
    
          if (png_get_gAMA(read_ptr, read_info_ptr, &gamma) != 0)
             png_set_gAMA(write_ptr, write_info_ptr, gamma);
       }
    #endif
    #endif /* Floating point */
    #endif /* Fixed point */
    #ifdef PNG_iCCP_SUPPORTED
       {
          png_charp name;
          png_bytep profile;
          png_uint_32 proflen;
          int compression_type;
    
          if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
              &profile, &proflen) != 0)
          {
             png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
                 profile, proflen);
          }
       }
    #endif
    #ifdef PNG_sRGB_SUPPORTED
       {
          int intent;
    
          if (png_get_sRGB(read_ptr, read_info_ptr, &intent) != 0)
             png_set_sRGB(write_ptr, write_info_ptr, intent);
       }
    #endif
       {
          png_colorp palette;
          int num_palette;
    
          if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette) != 0)
             png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
       }
    #ifdef PNG_bKGD_SUPPORTED
       {
          png_color_16p background;
    
          if (png_get_bKGD(read_ptr, read_info_ptr, &background) != 0)
          {
             png_set_bKGD(write_ptr, write_info_ptr, background);
          }
       }
    #endif
    #ifdef PNG_READ_eXIf_SUPPORTED
       {
          png_bytep exif=NULL;
          png_uint_32 exif_length;
    
          if (png_get_eXIf_1(read_ptr, read_info_ptr, &exif_length, &exif) != 0)
          {
             if (exif_length > 1)
                fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
                   (unsigned long)exif_length);
    # ifdef PNG_WRITE_eXIf_SUPPORTED
             png_set_eXIf_1(write_ptr, write_info_ptr, exif_length, exif);
    # endif
          }
       }
    #endif
    #ifdef PNG_hIST_SUPPORTED
       {
          png_uint_16p hist;
    
          if (png_get_hIST(read_ptr, read_info_ptr, &hist) != 0)
             png_set_hIST(write_ptr, write_info_ptr, hist);
       }
    #endif
    #ifdef PNG_oFFs_SUPPORTED
       {
          png_int_32 offset_x, offset_y;
          int unit_type;
    
          if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
              &unit_type) != 0)
          {
             png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
          }
       }
    #endif
    #ifdef PNG_pCAL_SUPPORTED
       {
          png_charp purpose, units;
          png_charpp params;
          png_int_32 X0, X1;
          int type, nparams;
    
          if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
              &nparams, &units, &params) != 0)
          {
             png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
                 nparams, units, params);
          }
       }
    #endif
    #ifdef PNG_pHYs_SUPPORTED
       {
          png_uint_32 res_x, res_y;
          int unit_type;
    
          if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y,
              &unit_type) != 0)
             png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
       }
    #endif
    #ifdef PNG_sBIT_SUPPORTED
       {
          png_color_8p sig_bit;
    
          if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit) != 0)
             png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
       }
    #endif
    #ifdef PNG_sCAL_SUPPORTED
    #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
       defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
       {
          int unit;
          double scal_width, scal_height;
    
          if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
              &scal_height) != 0)
          {
             png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
          }
       }
    #else
    #ifdef PNG_FIXED_POINT_SUPPORTED
       {
          int unit;
          png_charp scal_width, scal_height;
    
          if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
               &scal_height) != 0)
          {
             png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
                 scal_height);
          }
       }
    #endif
    #endif
    #endif
    
    #ifdef PNG_sPLT_SUPPORTED
       {
           png_sPLT_tp entries;
    
           int num_entries = (int) png_get_sPLT(read_ptr, read_info_ptr, &entries);
           if (num_entries)
           {
               png_set_sPLT(write_ptr, write_info_ptr, entries, num_entries);
           }
       }
    #endif
    
    #ifdef PNG_TEXT_SUPPORTED
       {
          png_textp text_ptr;
          int num_text;
    
          if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
          {
             pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
    
             pngtest_check_text_support(read_ptr, text_ptr, num_text);
    
             if (verbose != 0)
             {
                int i;
    
                fprintf(STDERR,"\n");
                for (i=0; i<num_text; i++)
                {
                   fprintf(STDERR,"   Text compression[%d]=%d\n",
                       i, text_ptr[i].compression);
                }
             }
    
             png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
          }
       }
    #endif
    #ifdef PNG_tIME_SUPPORTED
       {
          png_timep mod_time;
    
          if (png_get_tIME(read_ptr, read_info_ptr, &mod_time) != 0)
          {
             png_set_tIME(write_ptr, write_info_ptr, mod_time);
    #ifdef PNG_TIME_RFC1123_SUPPORTED
             if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
                tIME_string[(sizeof tIME_string) - 1] = '\0';
    
             else
             {
                strncpy(tIME_string, "*** invalid time ***", (sizeof tIME_string));
                tIME_string[(sizeof tIME_string) - 1] = '\0';
             }
    
             tIME_chunk_present++;
    #endif /* TIME_RFC1123 */
          }
       }
    #endif
    #ifdef PNG_tRNS_SUPPORTED
       {
          png_bytep trans_alpha;
          int num_trans;
          png_color_16p trans_color;
    
          if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
              &trans_color) != 0)
          {
             int sample_max = (1 << bit_depth);
             /* libpng doesn't reject a tRNS chunk with out-of-range samples */
             if (!((color_type == PNG_COLOR_TYPE_GRAY &&
                 (int)trans_color->gray > sample_max) ||
                 (color_type == PNG_COLOR_TYPE_RGB &&
                 ((int)trans_color->red > sample_max ||
                 (int)trans_color->green > sample_max ||
                 (int)trans_color->blue > sample_max))))
                png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
                   trans_color);
          }
       }
    #endif
    
    #ifdef PNG_APNG_SUPPORTED
       if (png_get_valid(read_ptr, read_info_ptr, PNG_INFO_acTL))
       {
          if (png_get_acTL(read_ptr, read_info_ptr, &num_frames, &num_plays))
          {
             png_byte is_hidden;
             pngtest_debug2("Handling acTL chunks (frames %ld, plays %ld)",
                        num_frames, num_plays);
             png_set_acTL(write_ptr, write_info_ptr, num_frames, num_plays);
             is_hidden = png_get_first_frame_is_hidden(read_ptr, read_info_ptr);
             png_set_first_frame_is_hidden(write_ptr, write_info_ptr, is_hidden);
          }
       }
    #endif
    
    #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
       {
          png_unknown_chunkp unknowns;
          int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
              &unknowns);
    
          if (num_unknowns != 0)
          {
             png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
                 num_unknowns);
    #if PNG_LIBPNG_VER < 10600
             /* Copy the locations from the read_info_ptr.  The automatically
              * generated locations in write_end_info_ptr are wrong prior to 1.6.0
              * because they are reset from the write pointer (removed in 1.6.0).
              */
             {
                int i;
                for (i = 0; i < num_unknowns; i++)
                  png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
                      unknowns[i].location);
             }
    #endif
          }
       }
    #endif
    
    #ifdef PNG_WRITE_SUPPORTED
       pngtest_debug("Writing info struct");
    
       /* Write the info in two steps so that if we write the 'unknown' chunks here
        * they go to the correct place.
        */
       png_write_info_before_PLTE(write_ptr, write_info_ptr);
    
       write_chunks(write_ptr, before_PLTE); /* before PLTE */
    
       png_write_info(write_ptr, write_info_ptr);
    
       write_chunks(write_ptr, before_IDAT); /* after PLTE */
    
       png_write_info(write_ptr, write_end_info_ptr);
    
       write_chunks(write_ptr, after_IDAT); /* after IDAT */
    
    #ifdef PNG_COMPRESSION_COMPAT
       /* Test the 'compatibility' setting here, if it is available. */
       png_set_compression(write_ptr, PNG_COMPRESSION_COMPAT);
    #endif
    #endif
    
    #ifdef SINGLE_ROWBUF_ALLOC
       pngtest_debug("Allocating row buffer...");
       row_buf = (png_bytep)png_malloc(read_ptr,
           png_get_rowbytes(read_ptr, read_info_ptr));
    
       pngtest_debug1("\t%p", row_buf);
    #endif /* SINGLE_ROWBUF_ALLOC */
       pngtest_debug("Writing row data");
    
    #if defined(PNG_READ_INTERLACING_SUPPORTED) &&\
       defined(PNG_WRITE_INTERLACING_SUPPORTED)
       /* Both must be defined for libpng to be able to handle the interlace,
        * otherwise it gets handled below by simply reading and writing the passes
        * directly.
        */
       if (png_set_interlace_handling(read_ptr) != num_passes)
          png_error(write_ptr,
              "png_set_interlace_handling(read): wrong pass count ");
       if (png_set_interlace_handling(write_ptr) != num_passes)
          png_error(write_ptr,
              "png_set_interlace_handling(write): wrong pass count ");
    #else /* png_set_interlace_handling not called on either read or write */
    #  define calc_pass_height
    #endif /* not using libpng interlace handling */
    
    #ifdef PNGTEST_TIMING
       t_stop = (float)clock();
       t_misc += (t_stop - t_start);
       t_start = t_stop;
    #endif
    #ifdef PNG_APNG_SUPPORTED
       if (png_get_valid(read_ptr, read_info_ptr, PNG_INFO_acTL))
       {
          png_uint_32 frame;
          for (frame = 0; frame < num_frames; frame++)
          {
             png_uint_32 frame_width;
             png_uint_32 frame_height;
             png_uint_32 x_offset;
             png_uint_32 y_offset;
             png_uint_16 delay_num;
             png_uint_16 delay_den;
             png_byte dispose_op;
             png_byte blend_op;
             png_read_frame_head(read_ptr, read_info_ptr);
             if (png_get_valid(read_ptr, read_info_ptr, PNG_INFO_fcTL))
             {
                png_get_next_frame_fcTL(read_ptr, read_info_ptr,
                                        &frame_width, &frame_height,
                                        &x_offset, &y_offset,
                                        &delay_num, &delay_den,
                                        &dispose_op, &blend_op);
             }
             else
             {
                frame_width = width;
                frame_height = height;
                x_offset = 0;
                y_offset = 0;
                delay_num = 1;
                delay_den = 1;
                dispose_op = PNG_DISPOSE_OP_NONE;
                blend_op = PNG_BLEND_OP_SOURCE;
             }
    #ifdef PNG_WRITE_APNG_SUPPORTED
             png_write_frame_head(write_ptr, write_info_ptr, (png_bytepp)&row_buf,
                                  frame_width, frame_height,
                                  x_offset, y_offset,
                                  delay_num, delay_den,
                                  dispose_op, blend_op);
    #endif
             for (pass = 0; pass < num_passes; pass++)
             {
    #           ifdef calc_pass_height
                   png_uint_32 pass_height;
    
                   if (num_passes == 7) /* interlaced */
                   {
                      if (PNG_PASS_COLS(frame_width, pass) > 0)
                         pass_height = PNG_PASS_ROWS(frame_height, pass);
    
                      else
                         pass_height = 0;
                   }
    
                   else /* not interlaced */
                      pass_height = frame_height;
    #           else
    #              define pass_height frame_height
    #           endif
    
                pngtest_debug1("Writing row data for pass %d", pass);
                for (y = 0; y < pass_height; y++)
                {
    #ifndef SINGLE_ROWBUF_ALLOC
                   pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
    
                   row_buf = (png_bytep)png_malloc(read_ptr,
                      png_get_rowbytes(read_ptr, read_info_ptr));
    
                   pngtest_debug2("\t0x%08lx (%lu bytes)", (unsigned long)row_buf,
                      (unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
    
    #endif /* !SINGLE_ROWBUF_ALLOC */
                   png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
    
    #ifdef PNG_WRITE_SUPPORTED
    #ifdef PNGTEST_TIMING
                   t_stop = (float)clock();
                   t_decode += (t_stop - t_start);
                   t_start = t_stop;
    #endif
                   png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
    #ifdef PNGTEST_TIMING
                   t_stop = (float)clock();
                   t_encode += (t_stop - t_start);
                   t_start = t_stop;
    #endif
    #endif /* PNG_WRITE_SUPPORTED */
    
    #ifndef SINGLE_ROWBUF_ALLOC
                   pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
                   png_free(read_ptr, row_buf);
                   row_buf = NULL;
    #endif /* !SINGLE_ROWBUF_ALLOC */
                }
             }
    #ifdef PNG_WRITE_APNG_SUPPORTED
             png_write_frame_tail(write_ptr, write_info_ptr);
    #endif
          }
       }
       else
    #endif
       for (pass = 0; pass < num_passes; pass++)
       {
    #     ifdef calc_pass_height
             png_uint_32 pass_height;
    
             if (num_passes == 7) /* interlaced */
             {
                if (PNG_PASS_COLS(width, pass) > 0)
                   pass_height = PNG_PASS_ROWS(height, pass);
    
                else
                   pass_height = 0;
             }
    
             else /* not interlaced */
                pass_height = height;
    #     else
    #        define pass_height height
    #     endif
    
          pngtest_debug1("Writing row data for pass %d", pass);
          for (y = 0; y < pass_height; y++)
          {
    #ifndef SINGLE_ROWBUF_ALLOC
             pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
    
             row_buf = (png_bytep)png_malloc(read_ptr,
                 png_get_rowbytes(read_ptr, read_info_ptr));
    
             pngtest_debug2("\t%p (%lu bytes)", row_buf,
                 (unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
    
    #endif /* !SINGLE_ROWBUF_ALLOC */
             png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
    
    #ifdef PNG_WRITE_SUPPORTED
    #ifdef PNGTEST_TIMING
             t_stop = (float)clock();
             t_decode += (t_stop - t_start);
             t_start = t_stop;
    #endif
             png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
    #ifdef PNGTEST_TIMING
             t_stop = (float)clock();
             t_encode += (t_stop - t_start);
             t_start = t_stop;
    #endif
    #endif /* WRITE */
    
    #ifndef SINGLE_ROWBUF_ALLOC
             pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
             png_free(read_ptr, row_buf);
             row_buf = NULL;
    #endif /* !SINGLE_ROWBUF_ALLOC */
          }
       }
    
    #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
    #  ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
          png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
    #  endif
    #  ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
          png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
    #  endif
    #endif
    
       pngtest_debug("Reading and writing end_info data");
    
       png_read_end(read_ptr, end_info_ptr);
    #ifdef PNG_TEXT_SUPPORTED
       {
          png_textp text_ptr;
          int num_text;
    
          if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
          {
             pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
    
             pngtest_check_text_support(read_ptr, text_ptr, num_text);
    
             if (verbose != 0)
             {
                int i;
    
                fprintf(STDERR,"\n");
                for (i=0; i<num_text; i++)
                {
                   fprintf(STDERR,"   Text compression[%d]=%d\n",
                       i, text_ptr[i].compression);
                }
             }
    
             png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
          }
       }
    #endif
    #ifdef PNG_READ_eXIf_SUPPORTED
       {
          png_bytep exif=NULL;
          png_uint_32 exif_length;
    
          if (png_get_eXIf_1(read_ptr, end_info_ptr, &exif_length, &exif) != 0)
          {
             if (exif_length > 1)
                fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
                   (unsigned long)exif_length);
    # ifdef PNG_WRITE_eXIf_SUPPORTED
             png_set_eXIf_1(write_ptr, write_end_info_ptr, exif_length, exif);
    # endif
          }
       }
    #endif
    #ifdef PNG_tIME_SUPPORTED
       {
          png_timep mod_time;
    
          if (png_get_tIME(read_ptr, end_info_ptr, &mod_time) != 0)
          {
             png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
    #ifdef PNG_TIME_RFC1123_SUPPORTED
             if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
                tIME_string[(sizeof tIME_string) - 1] = '\0';
    
             else
             {
                strncpy(tIME_string, "*** invalid time ***", sizeof tIME_string);
                tIME_string[(sizeof tIME_string)-1] = '\0';
             }
    
             tIME_chunk_present++;
    #endif /* TIME_RFC1123 */
          }
       }
    #endif
    #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
       {
          png_unknown_chunkp unknowns;
          int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
              &unknowns);
    
          if (num_unknowns != 0)
          {
             png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
                 num_unknowns);
    #if PNG_LIBPNG_VER < 10600
             /* Copy the locations from the read_info_ptr.  The automatically
              * generated locations in write_end_info_ptr are wrong prior to 1.6.0
              * because they are reset from the write pointer (removed in 1.6.0).
              */
             {
                int i;
                for (i = 0; i < num_unknowns; i++)
                  png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
                      unknowns[i].location);
             }
    #endif
          }
       }
    #endif
    
    #ifdef PNG_WRITE_SUPPORTED
    #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
       /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
        * This is here just to make pngtest replicate the results from libpng
        * versions prior to 1.5.4, and to test this new API.
        */
       png_set_text_compression_strategy(write_ptr, Z_FILTERED);
    #endif
    
       /* When the unknown vpAg/sTER chunks are written by pngtest the only way to
        * do it is to write them *before* calling png_write_end.  When unknown
        * chunks are written by libpng, however, they are written just before IEND.
        * There seems to be no way round this, however vpAg/sTER are not expected
        * after IDAT.
        */
       write_chunks(write_ptr, after_IDAT);
    
       png_write_end(write_ptr, write_end_info_ptr);
    #endif
    
    #ifdef PNG_EASY_ACCESS_SUPPORTED
       if (verbose != 0)
       {
          png_uint_32 iwidth, iheight;
          iwidth = png_get_image_width(write_ptr, write_info_ptr);
          iheight = png_get_image_height(write_ptr, write_info_ptr);
          fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
              (unsigned long)iwidth, (unsigned long)iheight);
       }
    #endif
    
       pngtest_debug("Destroying data structs");
    #ifdef SINGLE_ROWBUF_ALLOC
       pngtest_debug("destroying row_buf for read_ptr");
       png_free(read_ptr, row_buf);
       row_buf = NULL;
    #endif /* SINGLE_ROWBUF_ALLOC */
       pngtest_debug("destroying read_ptr, read_info_ptr, end_info_ptr");
       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
    #ifdef PNG_WRITE_SUPPORTED
       pngtest_debug("destroying write_end_info_ptr");
       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
       pngtest_debug("destroying write_ptr, write_info_ptr");
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
    #endif
       pngtest_debug("Destruction complete.");
    
       FCLOSE(fpin);
       FCLOSE(fpout);
    
       /* Summarize any warnings or errors and in 'strict' mode fail the test.
        * Unsupported chunks can result in warnings, in that case ignore the strict
        * setting, otherwise fail the test on warnings as well as errors.
        */
       if (error_count > 0)
       {
          /* We don't really expect to get here because of the setjmp handling
           * above, but this is safe.
           */
          fprintf(STDERR, "\n  %s: %d libpng errors found (%d warnings)",
              inname, error_count, warning_count);
    
          if (strict != 0)
             return (1);
       }
    
    #  ifdef PNG_WRITE_SUPPORTED
          /* If there is no write support nothing was written! */
          else if (unsupported_chunks > 0)
          {
             fprintf(STDERR, "\n  %s: unsupported chunks (%d)%s",
                 inname, unsupported_chunks, strict ? ": IGNORED --strict!" : "");
          }
    #  endif
    
       else if (warning_count > 0)
       {
          fprintf(STDERR, "\n  %s: %d libpng warnings found",
              inname, warning_count);
    
          if (strict != 0)
             return (1);
       }
    
       pngtest_debug("Opening files for comparison");
       if ((fpin = fopen(inname, "rb")) == NULL)
       {
          fprintf(STDERR, "Could not find file %s\n", inname);
          return (1);
       }
    
       if ((fpout = fopen(outname, "rb")) == NULL)
       {
          fprintf(STDERR, "Could not find file %s\n", outname);
          FCLOSE(fpin);
          return (1);
       }
    
    #if defined (PNG_WRITE_SUPPORTED) /* else nothing was written */ &&\
        defined (PNG_WRITE_FILTER_SUPPORTED)
       if (interlace_preserved != 0) /* else the files will be changed */
       {
          for (;;)
          {
             static int wrote_question = 0;
             size_t num_in, num_out;
             char inbuf[256], outbuf[256];
    
             num_in = fread(inbuf, 1, sizeof inbuf, fpin);
             num_out = fread(outbuf, 1, sizeof outbuf, fpout);
    
             if (num_in != num_out)
             {
                fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                    inname, outname);
    
                if (wrote_question == 0 && unsupported_chunks == 0)
                {
                   fprintf(STDERR,
                       "   Was %s written with the same maximum IDAT"
                       " chunk size (%d bytes),",
                       inname, PNG_ZBUF_SIZE);
                   fprintf(STDERR,
                       "\n   filtering heuristic (libpng default), compression");
                   fprintf(STDERR,
                       " level (zlib default),\n   and zlib version (%s)?\n\n",
                       ZLIB_VERSION);
                   wrote_question = 1;
                }
    
                FCLOSE(fpin);
                FCLOSE(fpout);
    
                if (strict != 0 && unsupported_chunks == 0)
                  return (1);
    
                else
                  return (0);
             }
    
             if (num_in == 0)
                break;
    
             if (memcmp(inbuf, outbuf, num_in))
             {
                fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
                    outname);
    
                if (wrote_question == 0 && unsupported_chunks == 0)
                {
                   fprintf(STDERR,
                       "   Was %s written with the same maximum"
                       " IDAT chunk size (%d bytes),",
                        inname, PNG_ZBUF_SIZE);
                   fprintf(STDERR,
                       "\n   filtering heuristic (libpng default), compression");
                   fprintf(STDERR,
                       " level (zlib default),\n   and zlib version (%s)?\n\n",
                     ZLIB_VERSION);
                   wrote_question = 1;
                }
    
                FCLOSE(fpin);
                FCLOSE(fpout);
    
                /* NOTE: the unsupported_chunks escape is permitted here because
                 * unsupported text chunk compression will result in the compression
                 * mode being changed (to NONE) yet, in the test case, the result
                 * can be exactly the same size!
                 */
                if (strict != 0 && unsupported_chunks == 0)
                  return (1);
    
                else
                  return (0);
             }
          }
       }
    #endif /* WRITE && WRITE_FILTER */
    
       FCLOSE(fpin);
       FCLOSE(fpout);
    
       return (0);
    }
    
    /* Input and output filenames */
    #ifdef RISCOS
    static const char *inname = "pngtest/png";
    static const char *outname = "pngout/png";
    #else
    static const char *inname = "pngtest.png";
    static const char *outname = "pngout.png";
    #endif
    
    int
    main(int argc, char *argv[])
    {
       int multiple = 0;
       int ierror = 0;
    
       png_structp dummy_ptr;
    
       fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
       fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
       fprintf(STDERR, "%s", png_get_copyright(NULL));
       /* Show the version of libpng used in building the library */
       fprintf(STDERR, " library (%lu):%s",
           (unsigned long)png_access_version_number(),
           png_get_header_version(NULL));
    
       /* Show the version of libpng used in building the application */
       fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
           PNG_HEADER_VERSION_STRING);
    
       /* Do some consistency checking on the memory allocation settings, I'm
        * not sure this matters, but it is nice to know, the first of these
        * tests should be impossible because of the way the macros are set
        * in pngconf.h
        */
    #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
          fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
    #endif
       /* I think the following can happen. */
    #if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
          fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
    #endif
    
       if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
       {
          fprintf(STDERR,
              "Warning: versions are different between png.h and png.c\n");
          fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
          fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
          ++ierror;
       }
    
       if (argc > 1)
       {
          if (strcmp(argv[1], "-m") == 0)
          {
             multiple = 1;
             status_dots_requested = 0;
          }
    
          else if (strcmp(argv[1], "-mv") == 0 ||
                   strcmp(argv[1], "-vm") == 0 )
          {
             multiple = 1;
             verbose = 1;
             status_dots_requested = 1;
          }
    
          else if (strcmp(argv[1], "-v") == 0)
          {
             verbose = 1;
             status_dots_requested = 1;
             inname = argv[2];
          }
    
          else if (strcmp(argv[1], "--strict") == 0)
          {
             status_dots_requested = 0;
             verbose = 1;
             inname = argv[2];
             strict++;
             relaxed = 0;
             multiple=1;
          }
    
          else if (strcmp(argv[1], "--relaxed") == 0)
          {
             status_dots_requested = 0;
             verbose = 1;
             inname = argv[2];
             strict = 0;
             relaxed++;
             multiple=1;
          }
          else if (strcmp(argv[1], "--xfail") == 0)
          {
             status_dots_requested = 0;
             verbose = 1;
             inname = argv[2];
             strict = 0;
             xfail++;
             relaxed++;
             multiple=1;
          }
    
          else
          {
             inname = argv[1];
             status_dots_requested = 0;
          }
       }
    
       if (multiple == 0 && argc == 3 + verbose)
          outname = argv[2 + verbose];
    
       if ((multiple == 0 && argc > 3 + verbose) ||
           (multiple != 0 && argc < 2))
       {
          fprintf(STDERR,
              "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
              argv[0], argv[0]);
          fprintf(STDERR,
              "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
          fprintf(STDERR,
              "  with -m %s is used as a temporary file\n", outname);
          exit(1);
       }
    
       if (multiple != 0)
       {
          int i;
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
          int allocation_now = current_allocation;
    #endif
          for (i=2; i<argc; ++i)
          {
             int kerror;
             fprintf(STDERR, "\n Testing %s:", argv[i]);
    #if PNG_DEBUG > 0
             fprintf(STDERR, "\n");
    #endif
             kerror = test_one_file(argv[i], outname);
             if (kerror == 0)
             {
    #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
                fprintf(STDERR, "\n PASS (%lu zero samples)\n",
                    (unsigned long)zero_samples);
    #else
                fprintf(STDERR, " PASS\n");
    #endif
    #ifdef PNG_TIME_RFC1123_SUPPORTED
                if (tIME_chunk_present != 0)
                   fprintf(STDERR, " tIME = %s\n", tIME_string);
    
                tIME_chunk_present = 0;
    #endif /* TIME_RFC1123 */
             }
    
             else
             {
                if (xfail)
                  fprintf(STDERR, " XFAIL\n");
                else
                {
                  fprintf(STDERR, " FAIL\n");
                  ierror += kerror;
                }
             }
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
             if (allocation_now != current_allocation)
                fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
                    current_allocation - allocation_now);
    
             if (current_allocation != 0)
             {
                memory_infop pinfo = pinformation;
    
                fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                    current_allocation);
    
                while (pinfo != NULL)
                {
                   fprintf(STDERR, " %lu bytes at %p\n",
                       (unsigned long)pinfo->size,
                       pinfo->pointer);
                   pinfo = pinfo->next;
                }
             }
    #endif
          }
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
             fprintf(STDERR, " Current memory allocation: %10d bytes\n",
                 current_allocation);
             fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
                 maximum_allocation);
             fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
                 total_allocation);
             fprintf(STDERR, "     Number of allocations: %10d\n",
                 num_allocations);
    #endif
       }
    
       else
       {
          int i;
          for (i = 0; i<3; ++i)
          {
             int kerror;
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
             int allocation_now = current_allocation;
    #endif
             if (i == 1)
                status_dots_requested = 1;
    
             else if (verbose == 0)
                status_dots_requested = 0;
    
             if (i == 0 || verbose == 1 || ierror != 0)
             {
                fprintf(STDERR, "\n Testing %s:", inname);
    #if PNG_DEBUG > 0
                fprintf(STDERR, "\n");
    #endif
             }
    
             kerror = test_one_file(inname, outname);
    
             if (kerror == 0)
             {
                if (verbose == 1 || i == 2)
                {
    #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
                    fprintf(STDERR, "\n PASS (%lu zero samples)\n",
                        (unsigned long)zero_samples);
    #else
                    fprintf(STDERR, " PASS\n");
    #endif
    #ifdef PNG_TIME_RFC1123_SUPPORTED
                 if (tIME_chunk_present != 0)
                    fprintf(STDERR, " tIME = %s\n", tIME_string);
    #endif /* TIME_RFC1123 */
                }
             }
    
             else
             {
                if (verbose == 0 && i != 2)
                {
                   fprintf(STDERR, "\n Testing %s:", inname);
    #if PNG_DEBUG > 0
                   fprintf(STDERR, "\n");
    #endif
                }
    
                if (xfail)
                  fprintf(STDERR, " XFAIL\n");
                else
                {
                  fprintf(STDERR, " FAIL\n");
                  ierror += kerror;
                }
             }
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
             if (allocation_now != current_allocation)
                 fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
                     current_allocation - allocation_now);
    
             if (current_allocation != 0)
             {
                 memory_infop pinfo = pinformation;
    
                 fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                     current_allocation);
    
                 while (pinfo != NULL)
                 {
                    fprintf(STDERR, " %lu bytes at %p\n",
                        (unsigned long)pinfo->size, pinfo->pointer);
                    pinfo = pinfo->next;
                 }
              }
    #endif
           }
    #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
           fprintf(STDERR, " Current memory allocation: %10d bytes\n",
               current_allocation);
           fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
               maximum_allocation);
           fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
               total_allocation);
           fprintf(STDERR, "     Number of allocations: %10d\n",
               num_allocations);
    #endif
       }
    
    #ifdef PNGTEST_TIMING
       t_stop = (float)clock();
       t_misc += (t_stop - t_start);
       t_start = t_stop;
       fprintf(STDERR, " CPU time used = %.3f seconds",
           (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
       fprintf(STDERR, " (decoding %.3f,\n",
           t_decode/(float)CLOCKS_PER_SEC);
       fprintf(STDERR, "        encoding %.3f ,",
           t_encode/(float)CLOCKS_PER_SEC);
       fprintf(STDERR, " other %.3f seconds)\n\n",
           t_misc/(float)CLOCKS_PER_SEC);
    #endif
    
       if (ierror == 0)
          fprintf(STDERR, " libpng passes test\n");
    
       else
          fprintf(STDERR, " libpng FAILS test\n");
    
       dummy_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
       fprintf(STDERR, " Default limits:\n");
       fprintf(STDERR, "  width_max  = %lu\n",
           (unsigned long) png_get_user_width_max(dummy_ptr));
       fprintf(STDERR, "  height_max = %lu\n",
           (unsigned long) png_get_user_height_max(dummy_ptr));
       if (png_get_chunk_cache_max(dummy_ptr) == 0)
          fprintf(STDERR, "  cache_max  = unlimited\n");
       else
          fprintf(STDERR, "  cache_max  = %lu\n",
              (unsigned long) png_get_chunk_cache_max(dummy_ptr));
       if (png_get_chunk_malloc_max(dummy_ptr) == 0)
          fprintf(STDERR, "  malloc_max = unlimited\n");
       else
          fprintf(STDERR, "  malloc_max = %lu\n",
              (unsigned long) png_get_chunk_malloc_max(dummy_ptr));
       png_destroy_read_struct(&dummy_ptr, NULL, NULL);
    
       return (int)(ierror != 0);
    }
    #else
    int
    main(void)
    {
       fprintf(STDERR,
           " test ignored because libpng was not built with read support\n");
       /* And skip this test */
       return PNG_LIBPNG_VER < 10600 ? 0 : 77;
    }
    #endif
    
    /* Generate a compiler error if there is an old png.h in the search path. */
    typedef png_libpng_version_1_6_37 Your_png_h_is_not_version_1_6_37;