X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1f0299c17dc878540bf190c290392db241b425ad..0fe5e8fea017ecb73f8aaa8ceb745feb269b3f79:/src/png/pngrio.c diff --git a/src/png/pngrio.c b/src/png/pngrio.c index 6c6710a46f..2af0e8954b 100644 --- a/src/png/pngrio.c +++ b/src/png/pngrio.c @@ -1,23 +1,22 @@ /* pngrio.c - functions for data input * - * libpng 1.0.1 + * libpng 1.0.3 - January 14, 1999 * For conditions of distribution and use, see copyright notice in png.h * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, Glenn Randers-Pehrson - * March 15, 1998 + * Copyright (c) 1998, 1999 Glenn Randers-Pehrson * - * This file provides a location for all input. Users which need - * special handling are expected to write a function which has the same - * arguments as this, and perform a similar function, but possibly has - * a different input method. Note that you shouldn't change this + * This file provides a location for all input. Users who need + * special handling are expected to write a function that has the same + * arguments as this and performs a similar function, but that possibly + * has a different input method. Note that you shouldn't change this * function, but rather write a replacement function and then make * libpng use it at run time with png_set_read_fn(...). */ #define PNG_INTERNAL -#include "../png/png.h" +#include "png.h" /* Read the data from whatever input you are using. The default routine reads from a file pointer. Note that this routine sometimes gets called @@ -35,13 +34,18 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) } #if !defined(PNG_NO_STDIO) -/* This is the function which does the actual reading of data. If you are +/* This is the function that does the actual reading of data. If you are not reading from a standard C stream, you should create a replacement read_data function and use it at run time with png_set_read_fn(), rather than changing the library. */ #ifndef USE_FAR_KEYWORD +#ifdef __VISAGECPP__ +static void _Optlink +png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +#else static void png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +#endif { png_size_t check; @@ -61,10 +65,10 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) can't handle far buffers in the medium and small models, we have to copy the data. */ - + #define NEAR_BUF_SIZE 1024 #define MIN(a,b) (a <= b ? a : b) - + static void png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { @@ -114,10 +118,10 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) png_ptr - pointer to a png input data structure io_ptr - pointer to user supplied structure containing info about the input functions. May be NULL. - read_data_fn - pointer to a new input function which takes as it's + read_data_fn - pointer to a new input function that takes as its arguments a pointer to a png_struct, a pointer to a location where input data can be stored, and a 32-bit - unsigned int which is the number of bytes to be read. + unsigned int that is the number of bytes to be read. To exit and output any fatal error messages the new write function should call png_error(png_ptr, "Error msg"). */ void @@ -136,7 +140,14 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, #endif /* It is an error to write to a read device */ - png_ptr->write_data_fn = NULL; + if (png_ptr->write_data_fn != NULL) + { + png_ptr->write_data_fn = NULL; + png_warning(png_ptr, + "It's an error to set both read_data_fn and write_data_fn in the "); + png_warning(png_ptr, + "same structure. Resetting write_data_fn to NULL."); + } #if defined(PNG_WRITE_FLUSH_SUPPORTED) png_ptr->output_flush_fn = NULL;