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/** \file
* \brief libJasper I/O
* I/O uses imBinFile instead of libJasper original handlers.
*
* See Copyright Notice in im_lib.h
* $Id: jas_binfile.c,v 1.1 2008/10/17 06:10:16 scuri Exp $
*/
#include <stdlib.h>
#include "jasper/jas_types.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_math.h"
#include "im_binfile.h"
/* These were static in jas_stream.c */
jas_stream_t *jas_stream_create(void);
void jas_stream_initbuf(jas_stream_t *stream, int bufmode, char *buf, int bufsize);
static int file_read(jas_stream_obj_t *obj, char *buf, int cnt)
{
imBinFile* file_bin = (imBinFile*)obj;
return imBinFileRead(file_bin, buf, cnt, 1);
}
static int file_write(jas_stream_obj_t *obj, char *buf, int cnt)
{
imBinFile* file_bin = (imBinFile*)obj;
return imBinFileWrite(file_bin, buf, cnt, 1);
}
static long file_seek(jas_stream_obj_t *obj, long offset, int origin)
{
imBinFile* file_bin = (imBinFile*)obj;
switch (origin)
{
case SEEK_SET:
imBinFileSeekTo(file_bin, offset);
break;
case SEEK_CUR:
imBinFileSeekOffset(file_bin, offset);
break;
case SEEK_END:
imBinFileSeekFrom(file_bin, offset);
break;
}
return imBinFileError(file_bin);
}
static int file_close(jas_stream_obj_t *obj)
{
imBinFile* file_bin = (imBinFile*)obj;
imBinFileClose(file_bin);
return 0;
}
static jas_stream_ops_t jas_stream_fileops = {
file_read,
file_write,
file_seek,
file_close
};
jas_stream_t *jas_binfile_open(const char *file_name, int is_new)
{
void* handle;
jas_stream_t *stream;
if (is_new)
handle = (void*)imBinFileNew(file_name);
else
handle = (void*)imBinFileOpen(file_name);
if (!handle)
return 0;
/* Allocate a stream object. */
stream = jas_stream_create();
if (is_new)
stream->openmode_ = JAS_STREAM_WRITE | JAS_STREAM_CREATE | JAS_STREAM_BINARY;
else
stream->openmode_ = JAS_STREAM_READ | JAS_STREAM_BINARY;
/* Select the operations for a file stream object. */
stream->ops_ = &jas_stream_fileops;
stream->obj_ = handle;
/* By default, use full buffering for this type of stream. */
jas_stream_initbuf(stream, JAS_STREAM_FULLBUF, 0, 0);
return stream;
}
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