/* pngwio.c - functions for data output
*
- * libpng 1.0.1
+ * Last changed in libpng 1.2.30 [August 15, 2008]
* 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) 1998-2008 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 output. Users which need
- * special handling are expected to write functions which have the same
- * arguments as these, and perform similar functions, but possibly use
- * different output methods. Note that you shouldn't change these
+ * This file provides a location for all output. Users who need
+ * special handling are expected to write functions that have the same
+ * arguments as these and perform similar functions, but that possibly
+ * use different output methods. Note that you shouldn't change these
* functions, but rather write replacement functions and then change
* them at run time with png_set_write_fn(...).
*/
#define PNG_INTERNAL
#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Write the data to whatever output you are using. The default routine
writes to 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 writes. This should never be asked
- to write more then 64K on a 16 bit machine. */
+ to write more than 64K on a 16 bit machine. */
-void
+void /* PRIVATE */
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
if (png_ptr->write_data_fn != NULL )
}
#if !defined(PNG_NO_STDIO)
-/* This is the function which does the actual writing of data. If you are
+/* This is the function that does the actual writing of data. If you are
not writing to a standard C stream, you should create a replacement
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
#ifndef USE_FAR_KEYWORD
-static void
+void PNGAPI
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_uint_32 check;
- check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+ if (png_ptr == NULL) return;
+#if defined(_WIN32_WCE)
+ if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+ check = 0;
+#else
+ check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
if (check != length)
- {
png_error(png_ptr, "Write Error");
- }
}
#else
/* this is the model-independent version. Since the standard I/O library
#define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b)
-static void
+void PNGAPI
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_uint_32 check;
png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
- FILE *io_ptr;
+ png_FILE_p io_ptr;
+ if (png_ptr == NULL) return;
/* Check if data really is near. If so, use usual code. */
near_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)near_data == data)
{
+#if defined(_WIN32_WCE)
+ if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+ check = 0;
+#else
check = fwrite(near_data, 1, length, io_ptr);
+#endif
}
else
{
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+#if defined(_WIN32_WCE)
+ if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+ err = 0;
+#else
err = fwrite(buf, 1, written, io_ptr);
+#endif
if (err != written)
break;
else
while (remaining != 0);
}
if (check != length)
- {
png_error(png_ptr, "Write Error");
- }
}
#endif
to disk). After png_flush is called, there should be no data pending
writing in any buffers. */
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-void
+void /* PRIVATE */
png_flush(png_structp png_ptr)
{
if (png_ptr->output_flush_fn != NULL)
}
#if !defined(PNG_NO_STDIO)
-static void
+void PNGAPI
png_default_flush(png_structp png_ptr)
{
- FILE *io_ptr;
- io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+ png_FILE_p io_ptr;
+#endif
+ if (png_ptr == NULL) return;
+#if !defined(_WIN32_WCE)
+ io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
if (io_ptr != NULL)
fflush(io_ptr);
+#endif
}
#endif
#endif
png_ptr - pointer to a png output data structure
io_ptr - pointer to user supplied structure containing info about
the output functions. May be NULL.
- write_data_fn - pointer to a new output function which takes as its
+ write_data_fn - pointer to a new output function that takes as its
arguments a pointer to a png_struct, a pointer to
- data to be written, and a 32-bit unsigned int which is
+ data to be written, and a 32-bit unsigned int that is
the number of bytes to be written. The new write
function should call png_error(png_ptr, "Error msg")
to exit and output any fatal error messages.
- flush_data_fn - pointer to a new flush function which takes as its
+ flush_data_fn - pointer to a new flush function that takes as its
arguments a pointer to a png_struct. After a call to
the flush function, there should be no data in any buffers
or pending transmission. If the output method doesn't do
PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
time, output_flush_fn will be ignored, although it must be
supplied for compatibility. */
-void
+void PNGAPI
png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
{
+ if (png_ptr == NULL) return;
png_ptr->io_ptr = io_ptr;
#if !defined(PNG_NO_STDIO)
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* It is an error to read while writing a png file */
- png_ptr->read_data_fn = NULL;
+ if (png_ptr->read_data_fn != NULL)
+ {
+ png_ptr->read_data_fn = NULL;
+ png_warning(png_ptr,
+ "Attempted to set both read_data_fn and write_data_fn in");
+ png_warning(png_ptr,
+ "the same structure. Resetting read_data_fn to NULL.");
+ }
}
-#if defined(USE_FAR_KEYWORD)
-#if defined(_MSC_VER)
-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+#if defined(USE_FAR_KEYWORD)
+#if defined(_MSC_VER)
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
{
- void *near_ptr;
+ void *near_ptr;
void FAR *far_ptr;
FP_OFF(near_ptr) = FP_OFF(ptr);
far_ptr = (void FAR *)near_ptr;
- if(check != 0)
- if(FP_SEG(ptr) != FP_SEG(far_ptr))
- png_error(png_ptr,"segment lost in conversion");
+ if (check != 0)
+ if (FP_SEG(ptr) != FP_SEG(far_ptr))
+ png_error(png_ptr, "segment lost in conversion");
return(near_ptr);
}
# else
-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
{
- void *near_ptr;
+ void *near_ptr;
void FAR *far_ptr;
near_ptr = (void FAR *)ptr;
far_ptr = (void FAR *)near_ptr;
- if(check != 0)
- if(far_ptr != ptr)
- png_error(png_ptr,"segment lost in conversion");
+ if (check != 0)
+ if (far_ptr != ptr)
+ png_error(png_ptr, "segment lost in conversion");
return(near_ptr);
}
# endif
# endif
+#endif /* PNG_WRITE_SUPPORTED */
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