WebSVN – Kolibri OS – Diff – /programs/develop/libraries/libpng/pngmem.c

 /* pngmem.c - stub functions for memory allocation
+ *
- * Last changed in libpng 1.5.1 [February 3, 2011]
+ * Last changed in libpng 1.6.0 [February 14, 2013]
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
 #include "pngpriv.h"
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Borland DOS special memory handler */
-#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* If you change this, be sure to change the one in png.h also */
-/* Allocate memory for a png_struct.  The malloc and memset can be replaced
-   by a single call to calloc() if this is thought to improve performance. */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_create_struct,(int type),PNG_ALLOCATED)
-{
-#  ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL, NULL));
-}
-/* Alternate version of png_create_struct, for use with user-defined malloc. */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
-   PNG_ALLOCATED)
-{
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   png_size_t size;
-   png_voidp struct_ptr;
-   if (type == PNG_STRUCT_INFO)
-      size = png_sizeof(png_info);
-   else if (type == PNG_STRUCT_PNG)
-      size = png_sizeof(png_struct);
-   else
-      return (png_get_copyright(NULL));
-#  ifdef PNG_USER_MEM_SUPPORTED
-   if (malloc_fn != NULL)
-   {
-      png_struct dummy_struct;
-      png_structp png_ptr = &dummy_struct;
-      png_ptr->mem_ptr=mem_ptr;
-      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
-   }
-   else
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   struct_ptr = (png_voidp)farmalloc(size);
-   if (struct_ptr != NULL)
-      png_memset(struct_ptr, 0, size);
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-   return (struct_ptr);
-}
-/* Free memory allocated by a png_create_struct() call */
+/* Free a png_struct */
 void /* PRIVATE */
-png_destroy_struct(png_voidp struct_ptr)
+png_destroy_png_struct(png_structrp png_ptr)
-{
-#  ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, NULL, NULL);
-}
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+{
-    png_voidp mem_ptr)
+   if (png_ptr != NULL)
+   {
+      /* png_free might call png_error and may certainly call
+       * png_get_mem_ptr, so fake a temporary png_struct to support this.
+       */
+      png_struct dummy_struct = *png_ptr;
+      memset(png_ptr, 0, (sizeof *png_ptr));
+      png_free(&dummy_struct, png_ptr);
+#     ifdef PNG_SETJMP_SUPPORTED
+         /* We may have a jmp_buf left to deallocate. */
          png_free_jmpbuf(&dummy_struct);
-#  endif
-   if (struct_ptr != NULL)
-   {
-#  ifdef PNG_USER_MEM_SUPPORTED
-      if (free_fn != NULL)
-      {
-         png_struct dummy_struct;
-         png_structp png_ptr = &dummy_struct;
-         png_ptr->mem_ptr=mem_ptr;
-         (*(free_fn))(png_ptr, struct_ptr);
-         return;
-      }
-#  endif /* PNG_USER_MEM_SUPPORTED */
-      farfree (struct_ptr);
+#     endif
+   }
+}
 /* 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
+ * 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.
- *
- * Borland seems to have a problem in DOS mode for exactly 64K.
- * It gives you a segment with an offset of 8 (perhaps to store its
- * memory stuff).  zlib doesn't like this at all, so we have to
- * detect and deal with it.  This code should not be needed in
- * Windows or OS/2 modes, and only in 16 bit mode.  This code has
- * been updated by Alexander Lehmann for version 0.89 to waste less
- * memory.
- *
- * Note that we can't use png_size_t for the "size" declaration,
- * since on some systems a png_size_t is a 16-bit quantity, and as a
- * result, we would be truncating potentially larger memory requests
+ * need to allocate exactly 64K, so whatever you call here must
- * (which should cause a fatal error) and introducing major problems.
+ * have the ability to do that.
  */
 PNG_FUNCTION(png_voidp,PNGAPI
-png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
    png_voidp ret;
-   ret = (png_malloc(png_ptr, size));
+   ret = png_malloc(png_ptr, size);
+   if (ret != NULL)
+      memset(ret, 0, size);
+   return ret;
+}
-   if (ret != NULL)
-      png_memset(ret,0,(png_size_t)size);
+/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of
+ * allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED.
  * Checking and error handling must happen outside this routine; it returns NULL
-   return (ret);
+ * if the allocation cannot be done (for any reason.)
-}
+ */
+PNG_FUNCTION(png_voidp /* PRIVATE */,
-PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
-png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+   PNG_ALLOCATED)
+{
-   png_voidp ret;
-   if (png_ptr == NULL || size == 0)
-      return (NULL);
-#  ifdef PNG_USER_MEM_SUPPORTED
-   if (png_ptr->malloc_fn != NULL)
-      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
-   else
-      ret = (png_malloc_default(png_ptr, size));
-   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+   /* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS
-       png_error(png_ptr, "Out of memory");
-   return (ret);
-}
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
-   png_voidp ret;
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   if (png_ptr == NULL || size == 0)
-      return (NULL);
-#  ifdef PNG_MAX_MALLOC_64K
-   if (size > (png_uint_32)65536L)
     * allocators have also been removed in 1.6.0, so any 16-bit system now has
-      png_warning(png_ptr, "Cannot Allocate > 64K");
-      ret = NULL;
+    * to implement a user memory handler.  This checks to be sure it isn't
-   }
-   else
-#  endif
-   if (size != (size_t)size)
-      ret = NULL;
-   else if (size == (png_uint_32)65536L)
-   {
-      if (png_ptr->offset_table == NULL)
-      {
-         /* Try to see if we need to do any of this fancy stuff */
-         ret = farmalloc(size);
-         if (ret == NULL || ((png_size_t)ret & 0xffff))
-         {
-            int num_blocks;
-            png_uint_32 total_size;
-            png_bytep table;
-            int i;
-            png_byte huge * hptr;
-            if (ret != NULL)
-            {
-               farfree(ret);
-               ret = NULL;
-            }
-            if (png_ptr->zlib_window_bits > 14)
-               num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
-            else
-               num_blocks = 1;
-            if (png_ptr->zlib_mem_level >= 7)
-               num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
-            else
-               num_blocks++;
-            total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
-            table = farmalloc(total_size);
-            if (table == NULL)
-            {
-#  ifndef PNG_USER_MEM_SUPPORTED
-               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-                  png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
-               else
-                  png_warning(png_ptr, "Out Of Memory");
-#  endif
+    * called with big numbers.
-               return (NULL);
-            }
-            if ((png_size_t)table & 0xfff0)
-            {
+    */
-#  ifndef PNG_USER_MEM_SUPPORTED
-               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-                  png_error(png_ptr,
-                    "Farmalloc didn't return normalized pointer");
-               else
-                  png_warning(png_ptr,
-                    "Farmalloc didn't return normalized pointer");
-#  endif
-               return (NULL);
-            }
-            png_ptr->offset_table = table;
-            png_ptr->offset_table_ptr = farmalloc(num_blocks *
-               png_sizeof(png_bytep));
-            if (png_ptr->offset_table_ptr == NULL)
-            {
-#  ifndef PNG_USER_MEM_SUPPORTED
+#ifdef PNG_USER_MEM_SUPPORTED
-               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-                  png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
-               else
-                  png_warning(png_ptr, "Out Of memory");
-#  endif
-               return (NULL);
-            }
-            hptr = (png_byte huge *)table;
-            if ((png_size_t)hptr & 0xf)
-            {
-               hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
-               hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
-            }
-            for (i = 0; i < num_blocks; i++)
-            {
-               png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
-               hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
-            }
+   PNG_UNUSED(png_ptr)
-            png_ptr->offset_table_number = num_blocks;
-            png_ptr->offset_table_count = 0;
+#endif
-            png_ptr->offset_table_count_free = 0;
+   if (size > 0 && size <= PNG_SIZE_MAX
-         }
+#     ifdef PNG_MAX_MALLOC_64K
-      }
+         && size <= 65536U
 #     endif
-      if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
+      )
-#  ifndef PNG_USER_MEM_SUPPORTED
-         if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-            png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
+   {
-         else
+#ifdef PNG_USER_MEM_SUPPORTED
-            png_warning(png_ptr, "Out of Memory");
+      if (png_ptr != NULL && png_ptr->malloc_fn != NULL)
-#  endif
-         return (NULL);
-      }
+         return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size);
-      ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
-   }
-   else
-      ret = farmalloc(size);
-#  ifndef PNG_USER_MEM_SUPPORTED
-   if (ret == NULL)
-   {
-      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
+      else
-      else
+#endif
-         png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
+         return malloc((size_t)size); /* checked for truncation above */
+   }
-#  endif
+   else
+      return NULL;
    return (ret);
-}
-/* Free a pointer allocated by png_malloc().  In the default
+/* This is really here only to work round a spurious warning in GCC 4.6 and 4.7
- * configuration, png_ptr is not used, but is passed in case it
- * is needed.  If ptr is NULL, return without taking any action.
- */
+ * that arises because of the checks in png_realloc_array that are repeated in
-void PNGAPI
-png_free(png_structp png_ptr, png_voidp ptr)
+ * png_malloc_array.
-{
+ */
-   if (png_ptr == NULL || ptr == NULL)
-      return;
+static png_voidp
+png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
-#  ifdef PNG_USER_MEM_SUPPORTED
+   size_t element_size)
-   if (png_ptr->free_fn != NULL)
-   {
-      (*(png_ptr->free_fn))(png_ptr, ptr);
-      return;
-   }
-   else
+{
-      png_free_default(png_ptr, ptr);
-}
-void PNGAPI
-png_free_default(png_structp png_ptr, png_voidp ptr)
-{
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   if (png_ptr == NULL || ptr == NULL)
-      return;
-   if (png_ptr->offset_table != NULL)
-   {
-      int i;
+   png_alloc_size_t req = nelements; /* known to be > 0 */
-      for (i = 0; i < png_ptr->offset_table_count; i++)
-      {
-         if (ptr == png_ptr->offset_table_ptr[i])
+   if (req <= PNG_SIZE_MAX/element_size)
-         {
-            ptr = NULL;
-            png_ptr->offset_table_count_free++;
-            break;
+      return png_malloc_base(png_ptr, req * element_size);
-      }
-      if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
-      {
-         farfree(png_ptr->offset_table);
-         farfree(png_ptr->offset_table_ptr);
-         png_ptr->offset_table = NULL;
+   /* The failure case when the request is too large */
+   return NULL;
-         png_ptr->offset_table_ptr = NULL;
+}
-   }
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_malloc_array,(png_const_structrp png_ptr, int nelements,
+   size_t element_size),PNG_ALLOCATED)
+{
-   if (ptr != NULL)
-      farfree(ptr);
-}
+   if (nelements <= 0 || element_size == 0)
+      png_error(png_ptr, "internal error: array alloc");
-#else /* Not the Borland DOS special memory handler */
+   return png_malloc_array_checked(png_ptr, nelements, element_size);
-/* Allocate memory for a png_struct or a png_info.  The malloc and
    memset can be replaced by a single call to calloc() if this is thought
-   to improve performance noticably. */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_create_struct,(int type),PNG_ALLOCATED)
-{
-#  ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL, NULL));
-}
-/* Allocate memory for a png_struct or a png_info.  The malloc and
+PNG_FUNCTION(png_voidp /* PRIVATE */,
-   memset can be replaced by a single call to calloc() if this is thought
-   to improve performance noticably. */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
-   PNG_ALLOCATED)
+png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array,
    int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
+{
-#  endif /* PNG_USER_MEM_SUPPORTED */
+   /* These are internal errors: */
-   png_size_t size;
+   if (add_elements <= 0 || element_size == 0 || old_elements < 0 ||
-   png_voidp struct_ptr;
+      (old_array == NULL && old_elements > 0))
+      png_error(png_ptr, "internal error: array realloc");
-   if (type == PNG_STRUCT_INFO)
-      size = png_sizeof(png_info);
+   /* Check for overflow on the elements count (so the caller does not have to
+    * check.)
-   else if (type == PNG_STRUCT_PNG)
+    */
-      size = png_sizeof(png_struct);
-   else
-      return (NULL);
-#  ifdef PNG_USER_MEM_SUPPORTED
-   if (malloc_fn != NULL)
-   {
-      png_struct dummy_struct;
-      png_structp png_ptr = &dummy_struct;
-      png_ptr->mem_ptr=mem_ptr;
-      struct_ptr = (*(malloc_fn))(png_ptr, size);
-      if (struct_ptr != NULL)
-         png_memset(struct_ptr, 0, size);
-      return (struct_ptr);
+   if (add_elements <= INT_MAX - old_elements)
-   }
-#  endif /* PNG_USER_MEM_SUPPORTED */
-#  if defined(__TURBOC__) && !defined(__FLAT__)
-   struct_ptr = (png_voidp)farmalloc(size);
-#  else
+   {
-#    if defined(_MSC_VER) && defined(MAXSEG_64K)
-   struct_ptr = (png_voidp)halloc(size, 1);
+      png_voidp new_array = png_malloc_array_checked(png_ptr,
-#    else
-   struct_ptr = (png_voidp)malloc(size);
-#    endif
+         old_elements+add_elements, element_size);
-#  endif
-   if (struct_ptr != NULL)
-      png_memset(struct_ptr, 0, size);
-   return (struct_ptr);
-}
-/* Free memory allocated by a png_create_struct() call */
+      if (new_array != NULL)
-void /* PRIVATE */
-png_destroy_struct(png_voidp struct_ptr)
-{
-#  ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, NULL, NULL);
-}
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
-    png_voidp mem_ptr)
-{
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   if (struct_ptr != NULL)
-   {
-#  ifdef PNG_USER_MEM_SUPPORTED
-      if (free_fn != NULL)
-      {
-         png_struct dummy_struct;
-         png_structp png_ptr = &dummy_struct;
-         png_ptr->mem_ptr=mem_ptr;
-         (*(free_fn))(png_ptr, struct_ptr);
-         return;
-      }
-#  endif /* PNG_USER_MEM_SUPPORTED */
 #  if defined(__TURBOC__) && !defined(__FLAT__)
-      farfree(struct_ptr);
          /* Because png_malloc_array worked the size calculations below cannot
-#  else
+          * overflow.
-#    if defined(_MSC_VER) && defined(MAXSEG_64K)
+          */
-      hfree(struct_ptr);
+         if (old_elements > 0)
+            memcpy(new_array, old_array, element_size*(unsigned)old_elements);
-#    else
-      free(struct_ptr);
+         memset((char*)new_array + element_size*(unsigned)old_elements, 0,
+            element_size*(unsigned)add_elements);
+         return new_array;
+      }
 #    endif
-#  endif
+   return NULL; /* error */
-   }
+}
 /* Various functions that have different error handling are derived from this.
  * png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate
-/* Allocate memory.  For reasonable files, size should never exceed
- * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * function png_malloc_default is also provided.
- * 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.
- */
+PNG_FUNCTION(png_voidp,PNGAPI
-PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
-{
+   png_voidp ret;
-   png_voidp ret;
    if (png_ptr == NULL)
+      return NULL;
+   ret = png_malloc_base(png_ptr, size);
+   if (ret == NULL)
-   ret = (png_malloc(png_ptr, size));
+       png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */
+   return ret;
    if (ret != NULL)
-      png_memset(ret,0,(png_size_t)size);
-   return (ret);
-}
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
-   png_voidp ret;
+#ifdef PNG_USER_MEM_SUPPORTED
-#  ifdef PNG_USER_MEM_SUPPORTED
-   if (png_ptr == NULL || size == 0)
+PNG_FUNCTION(png_voidp,PNGAPI
-      return (NULL);
-   if (png_ptr->malloc_fn != NULL)
-      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
-   else
-      ret = (png_malloc_default(png_ptr, size));
-   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-       png_error(png_ptr, "Out of Memory");
+png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size),
-   return (ret);
-}
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
-   png_voidp ret;
-#  endif /* PNG_USER_MEM_SUPPORTED */
-   if (png_ptr == NULL || size == 0)
-      return (NULL);
-#  ifdef PNG_MAX_MALLOC_64K
-   if (size > (png_uint_32)65536L)
-   {
+   PNG_ALLOCATED PNG_DEPRECATED)
-#    ifndef PNG_USER_MEM_SUPPORTED
-      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-         png_error(png_ptr, "Cannot Allocate > 64K");
-      else
-#    endif
-         return NULL;
-   }
+{
-#  endif
+   png_voidp ret;
-   /* Check for overflow */
+   if (png_ptr == NULL)
-#  if defined(__TURBOC__) && !defined(__FLAT__)
+      return NULL;
-   if (size != (unsigned long)size)
+   /* Passing 'NULL' here bypasses the application provided memory handler. */
-      ret = NULL;
+   ret = png_malloc_base(NULL/*use malloc*/, size);
-   else
+   if (ret == NULL)
-      ret = farmalloc(size);
+      png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */
-#  else
+   return ret;
 #    if defined(_MSC_VER) && defined(MAXSEG_64K)
-   if (size != (unsigned long)size)
-      ret = NULL;
+#endif /* PNG_USER_MEM_SUPPORTED */
-   else
       ret = halloc(size, 1);
 /* This function was added at libpng version 1.2.3.  The png_malloc_warn()
-#    else
+ * function will issue a png_warning and return NULL instead of issuing a
-   if (size != (size_t)size)
+ * png_error, if it fails to allocate the requested memory.
-      ret = NULL;
+ */
 PNG_FUNCTION(png_voidp,PNGAPI
-   else
+png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size),
-      ret = malloc((size_t)size);
+   PNG_ALLOCATED)
-#    endif
 #  endif
-#  ifndef PNG_USER_MEM_SUPPORTED
-   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-      png_error(png_ptr, "Out of Memory");
-#  endif
-   return (ret);
-}
    if (png_ptr != NULL)
-/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
- * without taking any action.
- */
-void PNGAPI
-png_free(png_structp png_ptr, png_voidp ptr)
-{
-   if (png_ptr == NULL || ptr == NULL)
-      return;
-#  ifdef PNG_USER_MEM_SUPPORTED
-   if (png_ptr->free_fn != NULL)
-   {
-      (*(png_ptr->free_fn))(png_ptr, ptr);
-      return;
-   }
-   else
-      png_free_default(png_ptr, ptr);
-}
-void PNGAPI
-png_free_default(png_structp png_ptr, png_voidp ptr)
-{
-   if (png_ptr == NULL || ptr == NULL)
       return;
-#  endif /* PNG_USER_MEM_SUPPORTED */
+      png_voidp ret = png_malloc_base(png_ptr, size);
-#  if defined(__TURBOC__) && !defined(__FLAT__)
+      if (ret != NULL)
-   farfree(ptr);
+         return ret;
-#  else
+      png_warning(png_ptr, "Out of memory");
 #    if defined(_MSC_VER) && defined(MAXSEG_64K)
    hfree(ptr);
    return NULL;
 #    else
    free(ptr);
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy and png_read_destroy are called.
  */
 png_voidp PNGAPI
-png_get_mem_ptr(png_const_structp png_ptr)
+png_get_mem_ptr(png_const_structrp png_ptr)
 {
    if (png_ptr == NULL)
-      return (NULL);
+      return NULL;
-   return ((png_voidp)png_ptr->mem_ptr);
+   return png_ptr->mem_ptr;
+}
 #endif /* PNG_USER_MEM_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

Subversion Repositories Kolibri OS

(root)/programs/develop/libraries/libpng/pngmem.c – Rev 1897 → 3928