diff options
Diffstat (limited to 'libpng/pngrio.c')
| -rw-r--r-- | libpng/pngrio.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/libpng/pngrio.c b/libpng/pngrio.c index 79755b4..7d2522f 100644 --- a/libpng/pngrio.c +++ b/libpng/pngrio.c @@ -1,9 +1,9 @@ /* pngrio.c - functions for data input * - * libpng 1.2.1 - December 12, 2001 + * Last changed in libpng 1.2.13 November 13, 2006 * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2001 Glenn Randers-Pehrson + * Copyright (c) 1998-2006 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.) * @@ -18,6 +18,8 @@ #define PNG_INTERNAL #include "png.h" +#if defined(PNG_READ_SUPPORTED) + /* Read the data from whatever input you are using. The default routine reads from a file pointer. Note that this routine sometimes gets called with very small lengths, so you should implement some kind of simple @@ -39,11 +41,12 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) 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 /* PRIVATE */ +void PNGAPI png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; + if(png_ptr == NULL) return; /* 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. */ @@ -67,13 +70,14 @@ png_default_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 /* PRIVATE */ +static void PNGAPI png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { int check; png_byte *n_data; png_FILE_p io_ptr; + if(png_ptr == NULL) return; /* 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); @@ -134,6 +138,7 @@ void PNGAPI png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn) { + if(png_ptr == NULL) return; png_ptr->io_ptr = io_ptr; #if !defined(PNG_NO_STDIO) @@ -159,3 +164,4 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, png_ptr->output_flush_fn = NULL; #endif } +#endif /* PNG_READ_SUPPORTED */ |