X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..dcbd3762e86258781ed81202977f680665190528:/src/png/pngrio.c diff --git a/src/png/pngrio.c b/src/png/pngrio.c index 7adb48f54c..806f791981 100644 --- a/src/png/pngrio.c +++ b/src/png/pngrio.c @@ -1,17 +1,16 @@ /* pngrio.c - functions for data input * - * libpng 1.0.1 + * libpng 1.2.7 - September 12, 2004 * 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) 1998-2004 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 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(...). */ @@ -24,10 +23,10 @@ with very small lengths, so you should implement some kind of simple buffering if you are using unbuffered reads. This should never be asked to read more then 64K on a 16 bit machine. */ -void +void /* PRIVATE */ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { - png_debug1(4,"reading %d bytes\n", length); + png_debug1(4,"reading %d bytes\n", (int)length); if (png_ptr->read_data_fn != NULL) (*(png_ptr->read_data_fn))(png_ptr, data, length); else @@ -35,12 +34,12 @@ 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 -static void +void PNGAPI png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; @@ -48,36 +47,44 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) /* 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. */ +#if defined(_WIN32_WCE) + if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) ) + check = 0; +#else check = (png_size_t)fread(data, (png_size_t)1, length, - (FILE *)png_ptr->io_ptr); + (png_FILE_p)png_ptr->io_ptr); +#endif if (check != length) - { png_error(png_ptr, "Read Error"); - } } #else /* this is the model-independent version. Since the standard I/O library 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 + +static void /* PRIVATE */ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { int check; png_byte *n_data; - FILE *io_ptr; + png_FILE_p io_ptr; /* Check if data really is near. If so, use usual code. */ n_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr); + io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); if ((png_bytep)n_data == data) { +#if defined(_WIN32_WCE) + if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) ) + check = 0; +#else check = fread(n_data, 1, length, io_ptr); +#endif } else { @@ -88,7 +95,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) do { read = MIN(NEAR_BUF_SIZE, remaining); +#if defined(_WIN32_WCE) + if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) ) + err = 0; +#else err = fread(buf, (png_size_t)1, read, io_ptr); +#endif png_memcpy(data, buf, read); /* copy far buffer to near buffer */ if(err != read) break; @@ -100,9 +112,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) while (remaining != 0); } if ((png_uint_32)check != (png_uint_32)length) - { png_error(png_ptr, "read Error"); - } } #endif #endif @@ -114,13 +124,13 @@ 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 +void PNGAPI png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn) { @@ -136,10 +146,16 @@ 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; -#endif /* PNG_WRITE_FLUSH_SUPPORTED */ +#endif } -