This repository has been archived on 2023-11-11. You can view files and clone it, but cannot push or open issues or pull requests.
libpng/pngwio.c

229 lines
7.3 KiB
C
Raw Normal View History

1996-06-05 20:50:50 +00:00
/* pngwio.c - functions for data output
1998-01-01 13:13:13 +00:00
*
2004-08-29 04:30:07 +00:00
* libpng 1.2.7beta2 - August 29, 2004
1998-01-01 13:13:13 +00:00
* For conditions of distribution and use, see copyright notice in png.h
2004-07-18 03:45:44 +00:00
* Copyright (c) 1998-2004 Glenn Randers-Pehrson
2000-06-04 19:29:29 +00:00
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
1998-01-01 13:13:13 +00:00
*
1998-05-21 14:27:50 +00:00
* 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
1998-01-01 13:13:13 +00:00
* functions, but rather write replacement functions and then change
* them at run time with png_set_write_fn(...).
*/
1996-06-05 20:50:50 +00:00
#define PNG_INTERNAL
#include "png.h"
2001-05-07 19:52:45 +00:00
#ifdef PNG_WRITE_SUPPORTED
1996-06-05 20:50:50 +00:00
/* 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
1998-06-14 19:43:31 +00:00
to write more than 64K on a 16 bit machine. */
1996-06-05 20:50:50 +00:00
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
1997-05-16 07:46:07 +00:00
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1996-06-05 20:50:50 +00:00
{
1997-05-16 07:46:07 +00:00
if (png_ptr->write_data_fn != NULL )
1996-06-05 20:50:50 +00:00
(*(png_ptr->write_data_fn))(png_ptr, data, length);
else
png_error(png_ptr, "Call to NULL write function");
}
1998-01-04 04:40:55 +00:00
#if !defined(PNG_NO_STDIO)
1998-05-21 14:27:50 +00:00
/* This is the function that does the actual writing of data. If you are
1996-06-05 20:50:50 +00:00
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
2002-05-01 16:51:26 +00:00
void PNGAPI
1997-05-16 07:46:07 +00:00
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1996-06-05 20:50:50 +00:00
{
png_uint_32 check;
2000-07-08 18:19:41 +00:00
#if defined(_WIN32_WCE)
if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
2000-07-10 12:48:54 +00:00
check = 0;
2000-07-08 18:19:41 +00:00
#else
check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
#endif
1996-06-05 20:50:50 +00:00
if (check != length)
png_error(png_ptr, "Write 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)
2002-05-01 16:51:26 +00:00
void PNGAPI
1997-05-16 07:46:07 +00:00
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1996-06-05 20:50:50 +00:00
{
png_uint_32 check;
1997-05-16 07:46:07 +00:00
png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
2000-07-08 18:19:41 +00:00
png_FILE_p io_ptr;
1996-06-05 20:50:50 +00:00
/* Check if data really is near. If so, use usual code. */
1997-05-16 07:46:07 +00:00
near_data = (png_byte *)CVT_PTR_NOCHECK(data);
2000-07-08 18:19:41 +00:00
io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
1997-05-16 07:46:07 +00:00
if ((png_bytep)near_data == data)
1996-06-05 20:50:50 +00:00
{
2000-07-10 12:48:54 +00:00
#if defined(_WIN32_WCE)
if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
check = 0;
#else
1997-05-16 07:46:07 +00:00
check = fwrite(near_data, 1, length, io_ptr);
2000-07-10 12:48:54 +00:00
#endif
1996-06-05 20:50:50 +00:00
}
else
{
png_byte buf[NEAR_BUF_SIZE];
png_size_t written, remaining, err;
check = 0;
1997-05-16 07:46:07 +00:00
remaining = length;
1996-06-05 20:50:50 +00:00
do
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
2000-07-10 12:48:54 +00:00
#if defined(_WIN32_WCE)
if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
err = 0;
#else
1997-01-17 07:34:35 +00:00
err = fwrite(buf, 1, written, io_ptr);
2000-07-10 12:48:54 +00:00
#endif
1996-06-05 20:50:50 +00:00
if (err != written)
break;
else
check += err;
data += written;
remaining -= written;
}
while (remaining != 0);
}
if (check != length)
png_error(png_ptr, "Write Error");
}
1998-01-04 04:40:55 +00:00
#endif
1996-06-05 20:50:50 +00:00
#endif
/* This function is called to output any data pending writing (normally
to disk). After png_flush is called, there should be no data pending
writing in any buffers. */
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
1996-06-05 20:50:50 +00:00
png_flush(png_structp png_ptr)
{
1997-05-16 07:46:07 +00:00
if (png_ptr->output_flush_fn != NULL)
1996-06-05 20:50:50 +00:00
(*(png_ptr->output_flush_fn))(png_ptr);
}
1998-01-04 04:40:55 +00:00
#if !defined(PNG_NO_STDIO)
2002-05-01 16:51:26 +00:00
void PNGAPI
1996-06-05 20:50:50 +00:00
png_default_flush(png_structp png_ptr)
{
2000-07-08 18:19:41 +00:00
#if !defined(_WIN32_WCE)
png_FILE_p io_ptr;
io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
1997-05-16 07:46:07 +00:00
if (io_ptr != NULL)
1997-01-17 07:34:35 +00:00
fflush(io_ptr);
2000-07-08 18:19:41 +00:00
#endif
1996-06-05 20:50:50 +00:00
}
#endif
1998-01-04 04:40:55 +00:00
#endif
1996-06-05 20:50:50 +00:00
/* This function allows the application to supply new output functions for
libpng if standard C streams aren't being used.
This function takes as its arguments:
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.
1998-05-21 14:27:50 +00:00
write_data_fn - pointer to a new output function that takes as its
1996-06-05 20:50:50 +00:00
arguments a pointer to a png_struct, a pointer to
1998-05-21 14:27:50 +00:00
data to be written, and a 32-bit unsigned int that is
1996-06-05 20:50:50 +00:00
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.
1998-05-21 14:27:50 +00:00
flush_data_fn - pointer to a new flush function that takes as its
1996-06-05 20:50:50 +00:00
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
any buffering of ouput, a function prototype must still be
supplied although it doesn't have to do anything. If
PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
time, output_flush_fn will be ignored, although it must be
supplied for compatibility. */
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-06-05 20:50:50 +00:00
png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
{
png_ptr->io_ptr = io_ptr;
1998-01-04 04:40:55 +00:00
#if !defined(PNG_NO_STDIO)
1997-05-16 07:46:07 +00:00
if (write_data_fn != NULL)
1996-06-05 20:50:50 +00:00
png_ptr->write_data_fn = write_data_fn;
else
2002-05-01 16:51:26 +00:00
png_ptr->write_data_fn = png_default_write_data;
1998-01-04 04:40:55 +00:00
#else
png_ptr->write_data_fn = write_data_fn;
#endif
1996-06-05 20:50:50 +00:00
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1998-01-04 04:40:55 +00:00
#if !defined(PNG_NO_STDIO)
1997-05-16 07:46:07 +00:00
if (output_flush_fn != NULL)
1996-06-05 20:50:50 +00:00
png_ptr->output_flush_fn = output_flush_fn;
else
2002-05-01 16:51:26 +00:00
png_ptr->output_flush_fn = png_default_flush;
1998-01-04 04:40:55 +00:00
#else
png_ptr->output_flush_fn = output_flush_fn;
#endif
1996-06-05 20:50:50 +00:00
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* It is an error to read while writing a png file */
1998-06-06 20:31:35 +00:00
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.");
}
1996-06-05 20:50:50 +00:00
}
1998-12-29 17:47:59 +00:00
#if defined(USE_FAR_KEYWORD)
#if defined(_MSC_VER)
1998-02-09 02:56:40 +00:00
void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
1997-01-17 07:34:35 +00:00
{
1998-12-29 17:47:59 +00:00
void *near_ptr;
1997-01-17 07:34:35 +00:00
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");
return(near_ptr);
}
# else
1998-02-09 02:56:40 +00:00
void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
1997-01-17 07:34:35 +00:00
{
1998-12-29 17:47:59 +00:00
void *near_ptr;
1997-01-17 07:34:35 +00:00
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");
return(near_ptr);
}
# endif
# endif
2001-05-07 19:52:45 +00:00
#endif /* PNG_WRITE_SUPPORTED */