/* pngrio.c - functions for data input
*
- * libpng 1.0.1
+ * Last changed in libpng 1.2.13 November 13, 2006
* 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) 1998-2006 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.)
*
- * 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"
+
+#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
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
}
#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;
+ 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.
*/
+#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 PNGAPI
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;
+ 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 = (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
{
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;
while (remaining != 0);
}
if ((png_uint_32)check != (png_uint_32)length)
- {
png_error(png_ptr, "read Error");
- }
}
#endif
#endif
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)
{
+ if(png_ptr == NULL) return;
png_ptr->io_ptr = io_ptr;
#if !defined(PNG_NO_STDIO)
#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
}
-
+#endif /* PNG_READ_SUPPORTED */
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