Imported from libpng-1.2.6beta4.tar
diff --git a/pngmem.c b/pngmem.c
index ed4629d..837fb30 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@
/* pngmem.c - stub functions for memory allocation
*
- * libpng version 1.2.6beta3 - July 18, 2004
+ * libpng version 1.2.6beta4 - July 28, 2004
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2004 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -39,9 +39,9 @@
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
return (png_get_copyright(NULL));
@@ -121,14 +121,12 @@
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
- {
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
- if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of memory!");
- return (ret);
- }
else
- return png_malloc_default(png_ptr, size);
+ 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!");
+ return (ret);
}
png_voidp PNGAPI
@@ -139,10 +137,16 @@
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
- png_error(png_ptr, "Cannot Allocate > 64K");
+ {
+ png_warning(png_ptr, "Cannot Allocate > 64K");
+ ret = NULL;
+ }
+ else
#endif
- if (size == (png_uint_32)65536L)
+ if (size != (size_t)size)
+ ret = NULL;
+ else if (size == (png_uint_32)65536L)
{
if (png_ptr->offset_table == NULL)
{
@@ -177,34 +181,40 @@
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" and "M" */
else
png_warning(png_ptr, "Out Of Memory.");
+#endif
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 *
- sizeof (png_bytep));
+ png_sizeof (png_bytep));
if (png_ptr->offset_table_ptr == 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" and "M" */
else
png_warning(png_ptr, "Out Of memory.");
+#endif
return (NULL);
}
@@ -228,10 +238,12 @@
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
png_warning(png_ptr, "Out of Memory.");
+#endif
return (NULL);
}
@@ -240,6 +252,7 @@
else
ret = farmalloc(size);
+#ifndef PNG_USER_MEM_SUPPORTED
if (ret == NULL)
{
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
@@ -247,6 +260,7 @@
else
png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
}
+#endif
return (ret);
}
@@ -325,9 +339,9 @@
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
return (NULL);
@@ -345,17 +359,16 @@
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
+ struct_ptr = (png_voidp)farmalloc(size);
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
- if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL)
+ struct_ptr = (png_voidp)halloc(size,1);
# else
- if ((struct_ptr = (png_voidp)malloc(size)) != NULL)
+ struct_ptr = (png_voidp)malloc(size);
# endif
#endif
- {
+ if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
- }
return (struct_ptr);
}
@@ -415,14 +428,12 @@
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
- {
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
- if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of Memory!");
- return (ret);
- }
else
- return (png_malloc_default(png_ptr, size));
+ 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!");
+ return (ret);
}
png_voidp PNGAPI
@@ -434,25 +445,39 @@
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
{
+#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
+ /* Check for overflow */
#if defined(__TURBOC__) && !defined(__FLAT__)
+ if (size != (unsigned long)size)
+ ret = NULL;
+ else
ret = farmalloc(size);
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
+ if (size != (unsigned long)size)
+ ret = NULL;
+ else
ret = halloc(size, 1);
# else
+ if (size != (size_t)size)
+ ret = NULL;
+ else
ret = malloc((size_t)size);
# 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);
}
@@ -498,8 +523,9 @@
# define png_malloc_warn png_malloc
#else
/* This function was added at libpng version 1.2.3. The png_malloc_warn()
- * function will issue a png_warning and return NULL instead of issuing a
- * png_error, if it fails to allocate the requested memory.
+ * function will set up png_malloc() to issue a png_warning and return NULL
+ * instead of issuing a png_error, if it fails to allocate the requested
+ * memory.
*/
png_voidp PNGAPI
png_malloc_warn(png_structp png_ptr, png_uint_32 size)