libopenmpt_stream_callbacks_file.h
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/*
* libopenmpt_stream_callbacks_file.h
* ----------------------------------
* Purpose: libopenmpt public c interface
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#ifndef LIBOPENMPT_STREAM_CALLBACKS_FILE_H
#define LIBOPENMPT_STREAM_CALLBACKS_FILE_H
#include "libopenmpt.h"
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#ifdef _MSC_VER
#include <wchar.h> /* off_t */
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* This stuff has to be in a header file because of possibly different MSVC CRTs which cause problems for FILE * crossing CRT boundaries. */
static size_t openmpt_stream_file_read_func( void * stream, void * dst, size_t bytes ) {
FILE * f = 0;
size_t retval = 0;
f = (FILE*)stream;
if ( !f ) {
return 0;
}
retval = fread( dst, 1, bytes, f );
if ( retval <= 0 ) {
return 0;
}
return retval;
}
static int openmpt_stream_file_seek_func( void * stream, int64_t offset, int whence ) {
FILE * f = 0;
int fwhence = 0;
f = (FILE*)stream;
if ( !f ) {
return -1;
}
switch ( whence ) {
#if defined(SEEK_SET)
case OPENMPT_STREAM_SEEK_SET:
fwhence = SEEK_SET;
break;
#endif
#if defined(SEEK_CUR)
case OPENMPT_STREAM_SEEK_CUR:
fwhence = SEEK_CUR;
break;
#endif
#if defined(SEEK_END)
case OPENMPT_STREAM_SEEK_END:
fwhence = SEEK_END;
break;
#endif
default:
return -1;
break;
}
#if defined(_MSC_VER)
return _fseeki64( f, offset, fwhence ) ? -1 : 0;
#elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
return fseeko( f, offset, fwhence ) ? -1 : 0;
#else
return fseek( f, offset, fwhence ) ? -1 : 0;
#endif
}
static int64_t openmpt_stream_file_tell_func( void * stream ) {
FILE * f = 0;
int64_t retval = 0;
f = (FILE*)stream;
if ( !f ) {
return -1;
}
#if defined(_MSC_VER)
retval = _ftelli64( f );
#elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
retval = ftello( f );
#else
retval = ftell( f );
#endif
if ( retval < 0 ) {
return -1;
}
return retval;
}
static openmpt_stream_callbacks openmpt_stream_get_file_callbacks(void) {
openmpt_stream_callbacks retval;
memset( &retval, 0, sizeof( openmpt_stream_callbacks ) );
retval.read = openmpt_stream_file_read_func;
retval.seek = openmpt_stream_file_seek_func;
retval.tell = openmpt_stream_file_tell_func;
return retval;
}
#ifdef __cplusplus
}
#endif
#endif /* LIBOPENMPT_STREAM_CALLBACKS_FILE_H */
openmpt_stream_file_seek_func
static int openmpt_stream_file_seek_func(void *stream, int64_t offset, int whence)
Definition: libopenmpt_stream_callbacks_file.h:43
OPENMPT_STREAM_SEEK_CUR
#define OPENMPT_STREAM_SEEK_CUR
Definition: libopenmpt.h:255
openmpt_stream_get_file_callbacks
static openmpt_stream_callbacks openmpt_stream_get_file_callbacks(void)
Definition: libopenmpt_stream_callbacks_file.h:99
OPENMPT_STREAM_SEEK_SET
#define OPENMPT_STREAM_SEEK_SET
Definition: libopenmpt.h:253
openmpt_stream_file_read_func
static size_t openmpt_stream_file_read_func(void *stream, void *dst, size_t bytes)
Definition: libopenmpt_stream_callbacks_file.h:29
libopenmpt.h
openmpt_stream_callbacks::tell
openmpt_stream_tell_func tell
Tell callback.
Definition: libopenmpt.h:317
OPENMPT_STREAM_SEEK_END
#define OPENMPT_STREAM_SEEK_END
Definition: libopenmpt.h:257
openmpt_stream_callbacks
Stream callbacks.
Definition: libopenmpt.h:297
openmpt_stream_file_tell_func
static int64_t openmpt_stream_file_tell_func(void *stream)
Definition: libopenmpt_stream_callbacks_file.h:79
openmpt_stream_callbacks::read
openmpt_stream_read_func read
Read callback.
Definition: libopenmpt.h:303
openmpt_stream_callbacks::seek
openmpt_stream_seek_func seek
Seek callback.
Definition: libopenmpt.h:310