133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* libopenmpt_stream_callbacks_file.h
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* ----------------------------------
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* Purpose: libopenmpt public c interface
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#ifndef LIBOPENMPT_STREAM_CALLBACKS_FILE_H
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#define LIBOPENMPT_STREAM_CALLBACKS_FILE_H
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#include "libopenmpt.h"
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef _MSC_VER
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#include <wchar.h> /* off_t */
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#endif
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/*! \addtogroup libopenmpt_c
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This stuff has to be in a header file because of possibly different MSVC CRTs which cause problems for FILE * crossing CRT boundaries. */
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static size_t openmpt_stream_file_read_func( void * stream, void * dst, size_t bytes ) {
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FILE * f = 0;
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size_t retval = 0;
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f = (FILE*)stream;
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if ( !f ) {
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return 0;
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}
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retval = fread( dst, 1, bytes, f );
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if ( retval <= 0 ) {
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return 0;
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}
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return retval;
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}
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static int openmpt_stream_file_seek_func( void * stream, int64_t offset, int whence ) {
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FILE * f = 0;
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int fwhence = 0;
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f = (FILE*)stream;
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if ( !f ) {
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return -1;
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}
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switch ( whence ) {
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#if defined(SEEK_SET)
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case OPENMPT_STREAM_SEEK_SET:
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fwhence = SEEK_SET;
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break;
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#endif
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#if defined(SEEK_CUR)
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case OPENMPT_STREAM_SEEK_CUR:
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fwhence = SEEK_CUR;
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break;
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#endif
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#if defined(SEEK_END)
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case OPENMPT_STREAM_SEEK_END:
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fwhence = SEEK_END;
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break;
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#endif
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default:
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return -1;
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break;
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}
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#if defined(_MSC_VER)
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return _fseeki64( f, offset, fwhence ) ? -1 : 0;
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#elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
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return fseeko( f, offset, fwhence ) ? -1 : 0;
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#else
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return fseek( f, offset, fwhence ) ? -1 : 0;
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#endif
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}
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static int64_t openmpt_stream_file_tell_func( void * stream ) {
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FILE * f = 0;
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int64_t retval = 0;
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f = (FILE*)stream;
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if ( !f ) {
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return -1;
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}
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#if defined(_MSC_VER)
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retval = _ftelli64( f );
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#elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
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retval = ftello( f );
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#else
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retval = ftell( f );
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#endif
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if ( retval < 0 ) {
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return -1;
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}
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return retval;
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}
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/*! \brief Provide openmpt_stream_callbacks for standard C FILE objects
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*
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* Fills openmpt_stream_callbacks suitable for passing a standard C FILE object as a stream parameter to functions doing file input/output.
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*
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* \remarks The stream argument must be passed as `(void*)(FILE*)file`.
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* \sa \ref libopenmpt_c_fileio
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* \sa openmpt_stream_callbacks
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* \sa openmpt_could_open_probability2
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* \sa openmpt_probe_file_header_from_stream
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* \sa openmpt_module_create2
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*/
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static openmpt_stream_callbacks openmpt_stream_get_file_callbacks(void) {
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openmpt_stream_callbacks retval;
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memset( &retval, 0, sizeof( openmpt_stream_callbacks ) );
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retval.read = openmpt_stream_file_read_func;
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retval.seek = openmpt_stream_file_seek_func;
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retval.tell = openmpt_stream_file_tell_func;
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return retval;
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}
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#ifdef __cplusplus
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}
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#endif
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/*!
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* @}
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*/
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#endif /* LIBOPENMPT_STREAM_CALLBACKS_FILE_H */
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