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

 *

 * (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 <stdio.h>

#  include <stdlib.h>

#  define FCLOSE(file) fclose(file)

     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

*/

#undef PNGTEST_TIMING

#endif

#ifdef PNGTEST_TIMING

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

#include <time.h>

#endif

#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");

}

/* 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

/* 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;

/* 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)

{

   /* 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.

    */

   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_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_ptr->io_ptr);

   if ((png_bytep)n_data == data)

   {

   }

   else

   {

      png_byte buf[NEAR_BUF_SIZE];

      png_size_t read, remaining, err;

      check = 0;

      remaining = length;

      do

      {

         read = MIN(NEAR_BUF_SIZE, remaining);

         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 */

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)

{

   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_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)

   {

   }

   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 */

         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!)";

}

/* 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.

    */

}

/* 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_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;

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

png_voidp

{

   /* 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,

      pinfo->size = size;

      current_allocation += size;

      total_allocation += size;

      num_allocations ++;

      if (current_allocation > maximum_allocation)

         maximum_allocation = current_allocation;

      /* Restore malloc_fn and free_fn */

      png_set_mem_fn(png_ptr,

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

      {

         current_allocation -= size;

         total_allocation -= size;

         png_error(png_ptr,

      }

      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