libopenmpt  0.4.6+release
cross-platform C++ and C library to decode tracked music files
libopenmpt_stream_callbacks_fd.h
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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 
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33 
34 /* This stuff has to be in a header file because of possibly different MSVC CRTs which cause problems for fd crossing CRT boundaries. */
35 
36 static size_t openmpt_stream_fd_read_func( void * stream, void * dst, size_t bytes ) {
37  int fd = 0;
38  #if defined(_MSC_VER)
39  size_t retval = 0;
40  int to_read = 0;
41  int ret_read = 0;
42  #else
43  ssize_t retval = 0;
44  #endif
45  fd = (int)(uintptr_t)stream;
46  if ( fd < 0 ) {
47  return 0;
48  }
49  #if defined(_MSC_VER)
50  retval = 0;
51  while ( bytes > 0 ) {
52  to_read = 0;
53  if ( bytes < (size_t)INT_MAX ) {
54  to_read = (int)bytes;
55  } else {
56  to_read = INT_MAX;
57  }
58  ret_read = _read( fd, dst, to_read );
59  if ( ret_read <= 0 ) {
60  return retval;
61  }
62  bytes -= ret_read;
63  retval += ret_read;
64  }
65  #else
66  retval = read( fd, dst, bytes );
67  #endif
68  if ( retval <= 0 ) {
69  return 0;
70  }
71  return retval;
72 }
73 
87  memset( &retval, 0, sizeof( openmpt_stream_callbacks ) );
89  return retval;
90 }
91 
92 #ifdef __cplusplus
93 }
94 #endif
95 
100 #endif /* LIBOPENMPT_STREAM_CALLBACKS_FD_H */
101 
static openmpt_stream_callbacks openmpt_stream_get_fd_callbacks(void)
Provide openmpt_stream_callbacks for standard POSIX file descriptors.
Definition: libopenmpt_stream_callbacks_fd.h:85
Stream callbacks.
Definition: libopenmpt.h:300
static size_t openmpt_stream_fd_read_func(void *stream, void *dst, size_t bytes)
Definition: libopenmpt_stream_callbacks_fd.h:36
openmpt_stream_read_func read
Read callback.
Definition: libopenmpt.h:306