diff -u pnglite-0.1.17.orig/pnglite.c pnglite-0.1.17/pnglite.c
--- pnglite-0.1.17.orig/pnglite.c	2011-08-11 13:48:04.899447483 +0300
+++ pnglite-0.1.17/pnglite.c	2011-08-11 13:53:20.159484127 +0300
@@ -113,7 +113,7 @@
 	if(pngalloc)
 		png_alloc = pngalloc;
 	else
-		png_alloc = &malloc;
+		png_alloc = (png_alloc_t)&malloc;
 
 	if(pngfree)
 		png_free = pngfree;
@@ -492,7 +492,7 @@
 	(void)png_end_deflate;
 	(void)png_deflate;
 
-	chunk = png_alloc(size);
+	chunk = png_alloc(size+8);
 	memcpy(chunk, "IDAT", 4);
 	
 	written = size;
diff -u pnglite-0.1.17.orig/pnglite.h pnglite-0.1.17/pnglite.h
--- pnglite-0.1.17.orig/pnglite.h	2011-08-11 13:48:04.907447382 +0300
+++ pnglite-0.1.17/pnglite.h	2011-08-11 13:54:45.938405741 +0300
@@ -70,10 +70,10 @@
 	Typedefs for callbacks.
 */
 
-typedef unsigned (*png_write_callback_t)(void* input, size_t size, size_t numel, void* user_pointer);
-typedef unsigned (*png_read_callback_t)(void* output, size_t size, size_t numel, void* user_pointer);
+typedef unsigned (*png_write_callback_t)(void* input, unsigned long size, unsigned long numel, void* user_pointer);
+typedef unsigned (*png_read_callback_t)(void* output, unsigned long size, unsigned long numel, void* user_pointer);
 typedef void (*png_free_t)(void* p);
-typedef void * (*png_alloc_t)(size_t s);
+typedef void * (*png_alloc_t)(unsigned long s);
 
 typedef struct
 {
@@ -100,7 +100,7 @@
 
 	This function initializes pnglite. The parameters can be used to set your own memory allocation routines following these formats:
 
-	> void* (*custom_alloc)(size_t s)
+	> void* (*custom_alloc)(unsigned long s)
 	> void (*custom_free)(void* p)
 	Parameters:
 		pngalloc - Pointer to custom allocation routine. If 0 is passed, malloc from libc will be used.
@@ -136,8 +136,8 @@
 
 	This function reads or writes a png from/to the specified callback. The callbacks should be of the format:
 
-	> size_t (*png_write_callback_t)(void* input, size_t size, size_t numel, void* user_pointer);
-	> size_t (*png_read_callback_t)(void* output, size_t size, size_t numel, void* user_pointer).
+	> unsigned long (*png_write_callback_t)(void* input, unsigned long size, unsigned long numel, void* user_pointer);
+	> unsigned long (*png_read_callback_t)(void* output, unsigned long size, unsigned long numel, void* user_pointer).
 
 	Only one callback has to be specified. The read callback in case of PNG reading, otherwise the write callback.