libopenmpt: libopenmpt/libopenmpt_stream_callbacks_file.h Source File

libopenmpt 0.4.53-pre.0+r25032 cross-platform C++ and C library to decode tracked music files

libopenmpt_stream_callbacks_file.h
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1 /*
2 * libopenmpt_stream_callbacks_file.h
3 * ----------------------------------
4 * Purpose: libopenmpt public c interface
5 * Notes : (currently none)
6 * Authors: OpenMPT Devs
7 * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
8 */
9
10 #ifndef LIBOPENMPT_STREAM_CALLBACKS_FILE_H
11 #define LIBOPENMPT_STREAM_CALLBACKS_FILE_H
12
13 #include "libopenmpt.h"
14
15 #include <limits.h>
16 #include <stdint.h>
17 #include <stdio.h>
18 #include <string.h>
19 #ifdef _MSC_VER
20 #include <wchar.h> /* off_t */
21 #endif
22
27 #ifdef __cplusplus
28 extern "C" {
29 #endif
30
31 /* This stuff has to be in a header file because of possibly different MSVC CRTs which cause problems for FILE * crossing CRT boundaries. */
32
33 static size_t openmpt_stream_file_read_func( void * stream, void * dst, size_t bytes ) {
34 FILE * f = 0;
35 size_t retval = 0;
36 f = (FILE*)stream;
37 if ( !f ) {
38 return 0;
39 }
40 retval = fread( dst, 1, bytes, f );
41 if ( retval <= 0 ) {
42 return 0;
43 }
44 return retval;
45 }
46
47 static int openmpt_stream_file_seek_func( void * stream, int64_t offset, int whence ) {
48 FILE * f = 0;
49 int fwhence = 0;
50 f = (FILE*)stream;
51 if ( !f ) {
52 return -1;
53 }
54 switch ( whence ) {
55 #if defined(SEEK_SET)
56 case OPENMPT_STREAM_SEEK_SET:
57 fwhence = SEEK_SET;
58 break;
59 #endif
60 #if defined(SEEK_CUR)
61 case OPENMPT_STREAM_SEEK_CUR:
62 fwhence = SEEK_CUR;
63 break;
64 #endif
65 #if defined(SEEK_END)
66 case OPENMPT_STREAM_SEEK_END:
67 fwhence = SEEK_END;
68 break;
69 #endif
70 default:
71 return -1;
72 break;
73 }
74 #if defined(_MSC_VER)
75 return _fseeki64( f, offset, fwhence ) ? -1 : 0;
76 #elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
77 return fseeko( f, offset, fwhence ) ? -1 : 0;
78 #else
79 return fseek( f, offset, fwhence ) ? -1 : 0;
80 #endif
81 }
82
83 static int64_t openmpt_stream_file_tell_func( void * stream ) {
84 FILE * f = 0;
85 int64_t retval = 0;
86 f = (FILE*)stream;
87 if ( !f ) {
88 return -1;
89 }
90 #if defined(_MSC_VER)
91 retval = _ftelli64( f );
92 #elif defined(_POSIX_SOURCE) && (_POSIX_SOURCE == 1)
93 retval = ftello( f );
94 #else
95 retval = ftell( f );
96 #endif
97 if ( retval < 0 ) {
98 return -1;
99 }
100 return retval;
101 }
102
114 static openmpt_stream_callbacks openmpt_stream_get_file_callbacks(void) {
115 openmpt_stream_callbacks retval;
116 memset( &retval, 0, sizeof( openmpt_stream_callbacks ) );
117 retval.read = openmpt_stream_file_read_func;
118 retval.seek = openmpt_stream_file_seek_func;
119 retval.tell = openmpt_stream_file_tell_func;
120 return retval;
121 }
122
123 #ifdef __cplusplus
124 }
125 #endif
126
131 #endif /* LIBOPENMPT_STREAM_CALLBACKS_FILE_H */
132
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:47
OPENMPT_STREAM_SEEK_CUR
#define OPENMPT_STREAM_SEEK_CUR
Definition: libopenmpt.h:255
OPENMPT_STREAM_SEEK_SET
#define OPENMPT_STREAM_SEEK_SET
Definition: libopenmpt.h:253
libopenmpt.h
openmpt_stream_callbacks::tell
openmpt_stream_tell_func tell
Tell callback.
Definition: libopenmpt.h:320
OPENMPT_STREAM_SEEK_END
#define OPENMPT_STREAM_SEEK_END
Definition: libopenmpt.h:257
openmpt_stream_callbacks
Stream callbacks.
Definition: libopenmpt.h:300
openmpt_stream_callbacks::read
openmpt_stream_read_func read
Read callback.
Definition: libopenmpt.h:306
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:33
openmpt_stream_file_tell_func
static int64_t openmpt_stream_file_tell_func(void *stream)
Definition: libopenmpt_stream_callbacks_file.h:83
openmpt_stream_callbacks::seek
openmpt_stream_seek_func seek
Seek callback.
Definition: libopenmpt.h:313
openmpt_stream_get_file_callbacks
static openmpt_stream_callbacks openmpt_stream_get_file_callbacks(void)
Provide openmpt_stream_callbacks for standard C FILE objects.
Definition: libopenmpt_stream_callbacks_file.h:114