libopenmpt  0.2.5787-autotools
cross-platform C++ and C library to decode tracked music files
libopenmpt_stream_callbacks_fd.h
Go to the documentation of this file.
1 /*
2  * libopenmpt_stream_callbacks_fd.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_FD_H
11 #define LIBOPENMPT_STREAM_CALLBACKS_FD_H
12 
13 #include "libopenmpt.h"
14 
15 #ifdef _MSC_VER
16 #include <io.h>
17 #endif
18 #include <limits.h>
19 #include <stdint.h>
20 #include <stdio.h>
21 #include <string.h>
22 #ifndef _MSC_VER
23 #include <unistd.h>
24 #endif
25 #ifdef _MSC_VER
26 #include <wchar.h> /* off_t */
27 #endif
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32 
33 /* This stuff has to be in a header file because of possibly different MSVC CRTs which cause problems for FILE * crossing CRT boundaries. */
34 
35 static size_t openmpt_stream_fd_read_func( void * stream, void * dst, size_t bytes ) {
36  int fd = 0;
37  #if defined(_MSC_VER)
38  size_t retval = 0;
39  int to_read = 0;
40  int ret_read = 0;
41  #else
42  ssize_t retval = 0;
43  #endif
44  fd = (int)(uintptr_t)stream;
45  if ( fd < 0 ) {
46  return 0;
47  }
48  #if defined(_MSC_VER)
49  retval = 0;
50  while ( bytes > 0 ) {
51  to_read = 0;
52  if ( bytes < (size_t)INT_MAX ) {
53  to_read = (int)bytes;
54  } else {
55  to_read = INT_MAX;
56  }
57  ret_read = _read( fd, dst, to_read );
58  if ( ret_read <= 0 ) {
59  return retval;
60  }
61  bytes -= ret_read;
62  retval += ret_read;
63  }
64  #else
65  retval = read( fd, dst, bytes );
66  #endif
67  if ( retval <= 0 ) {
68  return 0;
69  }
70  return retval;
71 }
72 
75  memset( &retval, 0, sizeof( openmpt_stream_callbacks ) );
77  return retval;
78 }
79 
80 #ifdef __cplusplus
81 }
82 #endif
83 
84 #endif /* LIBOPENMPT_STREAM_CALLBACKS_FD_H */
85 
static size_t openmpt_stream_fd_read_func(void *stream, void *dst, size_t bytes)
Definition: libopenmpt_stream_callbacks_fd.h:35
static openmpt_stream_callbacks openmpt_stream_get_fd_callbacks(void)
Definition: libopenmpt_stream_callbacks_fd.h:73
Stream callbacks.
Definition: libopenmpt.h:177
openmpt_stream_read_func read
Read callback.
Definition: libopenmpt.h:183