X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b61cc19c06d9795c73fc6fbe893e92898938c70e..ba49d2acf95d53517719c4fd9ac2ad5aaa13540b:/src/png/pngtest.c

diff --git a/src/png/pngtest.c b/src/png/pngtest.c
index 6317751cae..c52aef3e6b 100644
--- a/src/png/pngtest.c
+++ b/src/png/pngtest.c
@@ -1,8 +1,8 @@
 
 /* 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
+ * Last changed in libpng 1.5.6 [November 3, 2011]
+ * Copyright (c) 1998-2011 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.)
  *
@@ -31,26 +31,53 @@
  * of files at once by typing "pngtest -m file1.png file2.png ..."
  */
 
-#include "png.h"
-#include "pngpriv.h"
+#define _POSIX_SOURCE 1
 
+#include "zlib.h"
+#include "png.h"
+/* Copied from pngpriv.h but only used in error messages below. */
+#ifndef PNG_ZBUF_SIZE
+#  define PNG_ZBUF_SIZE 8192
+#endif
 #  include <stdio.h>
 #  include <stdlib.h>
+#  include <string.h>
 #  define FCLOSE(file) fclose(file)
 
 #ifndef PNG_STDIO_SUPPORTED
-     typedef FILE                * png_FILE_p;
+typedef FILE                * png_FILE_p;
 #endif
 
-/* Makes pngtest verbose so we can find problems (needs to be before png.h) */
+/* 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
 
+/* The code uses memcmp and memcpy on large objects (typically row pointers) so
+ * it is necessary to do soemthing special on certain architectures, note that
+ * the actual support for this was effectively removed in 1.4, so only the
+ * memory remains in this program:
+ */
+#define CVT_PTR(ptr)         (ptr)
+#define CVT_PTR_NOCHECK(ptr) (ptr)
+#define png_memcmp  memcmp
+#define png_memcpy  memcpy
+#define png_memset  memset
+
 /* Turn on CPU timing
 #define PNGTEST_TIMING
 */
@@ -71,6 +98,7 @@ static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
 #endif
 
 static int verbose = 0;
+static int strict = 0;
 
 int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
 
@@ -82,11 +110,6 @@ int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
 /*  #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
@@ -97,35 +120,40 @@ static int status_pass = 1;
 static int status_dots_requested = 0;
 static int status_dots = 1;
 
-void
+void PNGCBAPI
 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
-void
+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");
 }
 
-void
+void PNGCBAPI
 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
-void
+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");
 }
 
@@ -136,9 +164,9 @@ write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
  * 5 in case illegal filter values are present.)
  */
 static png_uint_32 filters_used[256];
-void
+void PNGCBAPI
 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data);
-void
+void PNGCBAPI
 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 {
    if (png_ptr != NULL && row_info != NULL)
@@ -153,13 +181,14 @@ count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 
 static png_uint_32 zero_samples;
 
-void
+void PNGCBAPI
 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data);
-void
+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;
+   if (png_ptr == NULL)
+      return;
 
    /* Contents of row_info:
     *  png_uint_32 width      width of row
@@ -176,41 +205,49 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
     {
        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)
@@ -233,10 +270,12 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
              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;
              }
           }
@@ -263,8 +302,50 @@ static int wrote_question = 0;
  * than changing the library.
  */
 
+#ifdef PNG_IO_STATE_SUPPORTED
+void
+pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+   png_uint_32 io_op);
+void
+pngtest_check_io_state(png_structp png_ptr, png_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)
+      png_error(png_ptr, "Bad I/O state or buffer size");
+}
+#endif
+
 #ifndef USE_FAR_KEYWORD
-static void
+static void PNGCBAPI
 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check = 0;
@@ -281,8 +362,12 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 
    if (check != length)
    {
-      png_error(png_ptr, "Read Error!");
+      png_error(png_ptr, "Read Error");
    }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -293,7 +378,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+static void PNGCBAPI
 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
@@ -313,6 +398,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_size_t read, remaining, err;
       check = 0;
       remaining = length;
+
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
@@ -327,17 +413,22 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       }
       while (remaining != 0);
    }
+
    if (check != length)
-      png_error(png_ptr, "read Error");
+      png_error(png_ptr, "Read Error");
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #endif /* USE_FAR_KEYWORD */
 
 #ifdef PNG_WRITE_FLUSH_SUPPORTED
-static void
+static void PNGCBAPI
 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 */
+   PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
 }
 #endif
 
@@ -347,18 +438,21 @@ pngtest_flush(png_structp png_ptr)
  * than changing the library.
  */
 #ifndef USE_FAR_KEYWORD
-static void
+static void PNGCBAPI
 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);
+   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
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -369,7 +463,7 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+static void PNGCBAPI
 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
@@ -378,17 +472,20 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 
    /* 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);
+   io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_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);
@@ -403,10 +500,15 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       }
       while (remaining != 0);
    }
+
    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 /* USE_FAR_KEYWORD */
 
@@ -415,14 +517,16 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
  * 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
+static void PNGCBAPI
 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);
 }
@@ -432,7 +536,7 @@ pngtest_warning(png_structp png_ptr, png_const_charp message)
  * function is used by default, or if the program supplies NULL for the
  * error function pointer in png_set_error_fn().
  */
-static void
+static void PNGCBAPI
 pngtest_error(png_structp png_ptr, png_const_charp message)
 {
    pngtest_warning(png_ptr, message);
@@ -469,12 +573,12 @@ 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 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
-png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
+PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
 {
 
    /* png_malloc has already tested for NULL; png_create_struct calls
@@ -496,12 +600,16 @@ png_debug_malloc(png_structp png_ptr, png_alloc_size_t 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;
@@ -509,23 +617,27 @@ png_debug_malloc(png_structp png_ptr, png_alloc_size_t 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,
+         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
+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. */
@@ -537,9 +649,11 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
    /* Unlink the element from the list. */
    {
       memory_infop FAR *ppinfo = &pinformation;
+
       for (;;)
       {
          memory_infop pinfo = *ppinfo;
+
          if (pinfo->pointer == ptr)
          {
             *ppinfo = pinfo->next;
@@ -553,18 +667,21 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
             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);
+      printf("Freeing %p\n", ptr);
+
    png_free_default(png_ptr, ptr);
    ptr = NULL;
 }
@@ -586,7 +703,7 @@ static png_uint_32 user_chunk_data[4];
      * 3: vpAg units
      */
 
-static int read_user_chunk_callback(png_struct *png_ptr,
+static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr,
    png_unknown_chunkp chunk)
 {
    png_uint_32
@@ -611,8 +728,10 @@ static int read_user_chunk_callback(png_struct *png_ptr,
          /* 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);
@@ -663,7 +782,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    int bit_depth, color_type;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
-   jmp_buf jmpbuf;
+   jmp_buf tmp_jmpbuf;
 #endif
 #endif
 
@@ -684,12 +803,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       return (1);
    }
 
-   png_debug(0, "Allocating read and write structures");
+   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_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
+      NULL, NULL, NULL, png_debug_malloc, png_debug_free);
 #else
    read_ptr =
       png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
@@ -722,7 +840,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
        pngtest_warning);
 #endif
 #endif
-   png_debug(0, "Allocating read_info, write_info and end_info structures");
+   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
@@ -731,9 +849,9 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   png_debug(0, "Setting jmpbuf for read struct");
+   pngtest_debug("Setting jmpbuf for read struct");
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(read_ptr)))
 #endif
@@ -751,13 +869,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       return (1);
    }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(read_ptr), jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(read_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
-   png_debug(0, "Setting jmpbuf for write struct");
+   pngtest_debug("Setting jmpbuf for write struct");
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(jmpbuf))
+
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(write_ptr)))
 #endif
@@ -772,13 +891,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       FCLOSE(fpout);
       return (1);
    }
+
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(write_ptr), jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(write_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 #endif
 #endif
 
-   png_debug(0, "Initializing input and output streams");
+   pngtest_debug("Initializing input and output streams");
 #ifdef PNG_STDIO_SUPPORTED
    png_init_io(read_ptr, fpin);
 #  ifdef PNG_WRITE_SUPPORTED
@@ -795,6 +915,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #    endif
 #  endif
 #endif
+
+#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
+
    if (status_dots_requested == 1)
    {
 #ifdef PNG_WRITE_SUPPORTED
@@ -802,6 +931,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
       png_set_read_status_fn(read_ptr, read_row_callback);
    }
+
    else
    {
 #ifdef PNG_WRITE_SUPPORTED
@@ -813,8 +943,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #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
@@ -838,10 +970,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       NULL, 0);
 #endif
 
-   png_debug(0, "Reading info struct");
+   pngtest_debug("Reading info struct");
    png_read_info(read_ptr, read_info_ptr);
 
-   png_debug(0, "Transferring info struct");
+   pngtest_debug("Transferring info struct");
    {
       int interlace_type, compression_type, filter_type;
 
@@ -861,6 +993,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    {
       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))
       {
@@ -883,6 +1016,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    {
       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))
       {
@@ -904,7 +1038,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_iCCP_SUPPORTED
    {
       png_charp name;
-      png_charp profile;
+      png_bytep profile;
       png_uint_32 proflen;
       int compression_type;
 
@@ -1028,7 +1162,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
       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);
+         pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
+
+         if (verbose)
+            printf("\nText compression=%d\n", text_ptr->compression);
+
          png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
       }
    }
@@ -1048,6 +1186,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          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 */
@@ -1079,18 +1218,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
    {
       png_unknown_chunkp unknowns;
-      int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
          &unknowns);
+
       if (num_unknowns)
       {
-         png_size_t i;
+         int 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++)
+         for (i = 0; i < num_unknowns; i++)
            png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
              unknowns[i].location);
       }
@@ -1098,7 +1238,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
-   png_debug(0, "Writing info struct");
+   pngtest_debug("Writing info struct");
 
 /* If we wanted, we could write info in two steps:
  * png_write_info_before_PLTE(write_ptr, write_info_ptr);
@@ -1116,9 +1256,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       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'};
@@ -1131,6 +1273,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
            (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);
@@ -1141,12 +1284,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef SINGLE_ROWBUF_ALLOC
-   png_debug(0, "Allocating row buffer...");
+   pngtest_debug("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);
+
+   pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
 #endif /* SINGLE_ROWBUF_ALLOC */
-   png_debug(0, "Writing row data");
+   pngtest_debug("Writing row data");
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
   defined(PNG_WRITE_INTERLACING_SUPPORTED)
@@ -1165,15 +1309,17 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
    for (pass = 0; pass < num_pass; pass++)
    {
-      png_debug1(0, "Writing row data for pass %d", pass);
+      pngtest_debug1("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);
+         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));
-         png_debug2(0, "0x%08lx (%ld bytes)", (unsigned long)row_buf,
+
+         pngtest_debug2("\t0x%08lx (%u 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);
 
@@ -1192,7 +1338,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif /* PNG_WRITE_SUPPORTED */
 
 #ifndef SINGLE_ROWBUF_ALLOC
-         png_debug2(0, "Freeing row buffer (pass %d, y = %ld)", pass, y);
+         pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
          png_free(read_ptr, row_buf);
          row_buf = NULL;
 #endif /* !SINGLE_ROWBUF_ALLOC */
@@ -1206,7 +1352,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
 #endif
 
-   png_debug(0, "Reading and writing end_info data");
+   pngtest_debug("Reading and writing end_info data");
 
    png_read_end(read_ptr, end_info_ptr);
 #ifdef PNG_TEXT_SUPPORTED
@@ -1216,7 +1362,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
       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);
+         pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
          png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
       }
    }
@@ -1235,6 +1381,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          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 */
@@ -1244,19 +1391,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #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,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
          &unknowns);
+
       if (num_unknowns)
       {
-         png_size_t i;
+         int 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++)
+         for (i = 0; i < num_unknowns; i++)
            png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
              unknowns[i].location);
       }
@@ -1277,26 +1424,26 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    }
 #endif
 
-   png_debug(0, "Destroying data structs");
+   pngtest_debug("Destroying data structs");
 #ifdef SINGLE_ROWBUF_ALLOC
-   png_debug(1, "destroying row_buf for read_ptr");
+   pngtest_debug("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");
+   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
-   png_debug(1, "destroying write_end_info_ptr");
+   pngtest_debug("destroying write_end_info_ptr");
    png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-   png_debug(1, "destroying write_ptr, write_info_ptr");
+   pngtest_debug("destroying write_ptr, write_info_ptr");
    png_destroy_write_struct(&write_ptr, &write_info_ptr);
 #endif
-   png_debug(0, "Destruction complete.");
+   pngtest_debug("Destruction complete.");
 
    FCLOSE(fpin);
    FCLOSE(fpout);
 
-   png_debug(0, "Opening files for comparison");
+   pngtest_debug("Opening files for comparison");
    if ((fpin = fopen(inname, "rb")) == NULL)
    {
       fprintf(STDERR, "Could not find file %s\n", inname);
@@ -1321,6 +1468,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                  inname, outname);
+
          if (wrote_question == 0)
          {
             fprintf(STDERR,
@@ -1333,9 +1481,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
               ZLIB_VERSION);
             wrote_question = 1;
          }
+
          FCLOSE(fpin);
          FCLOSE(fpout);
-         return (0);
+
+         if (strict != 0)
+           return (1);
+
+         else
+           return (0);
       }
 
       if (!num_in)
@@ -1344,6 +1498,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       if (png_memcmp(inbuf, outbuf, num_in))
       {
          fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname);
+
          if (wrote_question == 0)
          {
             fprintf(STDERR,
@@ -1356,9 +1511,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
               ZLIB_VERSION);
             wrote_question = 1;
          }
+
          FCLOSE(fpin);
          FCLOSE(fpout);
-         return (0);
+
+         if (strict != 0)
+           return (1);
+
+         else
+           return (0);
       }
    }
 
@@ -1390,11 +1551,10 @@ main(int argc, char *argv[])
    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
@@ -1425,6 +1585,7 @@ main(int argc, char *argv[])
          multiple = 1;
          status_dots_requested = 0;
       }
+
       else if (strcmp(argv[1], "-mv") == 0 ||
                strcmp(argv[1], "-vm") == 0 )
       {
@@ -1432,12 +1593,22 @@ main(int argc, char *argv[])
          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++;
+      }
+
       else
       {
          inname = argv[1];
@@ -1491,9 +1662,11 @@ main(int argc, char *argv[])
 #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");
@@ -1503,17 +1676,19 @@ main(int argc, char *argv[])
          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);
+                 (unsigned int)pinfo->pointer);
                pinfo = pinfo->next;
             }
          }
@@ -1530,6 +1705,7 @@ main(int argc, char *argv[])
             num_allocations);
 #endif
    }
+
    else
    {
       int i;
@@ -1539,11 +1715,17 @@ main(int argc, char *argv[])
 #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 == 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)
@@ -1569,10 +1751,12 @@ main(int argc, char *argv[])
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
             }
          }
+
          else
          {
             if (verbose == 0 && i != 2)
                fprintf(STDERR, "\n Testing %s:", inname);
+
             fprintf(STDERR, " FAIL\n");
             ierror += kerror;
          }
@@ -1580,12 +1764,14 @@ main(int argc, char *argv[])
          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",
@@ -1623,10 +1809,12 @@ main(int argc, char *argv[])
 
    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;
+typedef png_libpng_version_1_5_7 Your_png_h_is_not_version_1_5_7;