102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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/*
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* libopenmpt_stream_callbacks_fd.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_FD_H
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#define LIBOPENMPT_STREAM_CALLBACKS_FD_H
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#include "libopenmpt.h"
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#ifdef _MSC_VER
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#include <io.h>
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#endif
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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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#ifndef _MSC_VER
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#include <unistd.h>
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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 fd crossing CRT boundaries. */
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static size_t openmpt_stream_fd_read_func( void * stream, void * dst, size_t bytes ) {
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int fd = 0;
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#if defined(_MSC_VER)
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size_t retval = 0;
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int to_read = 0;
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int ret_read = 0;
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#else
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ssize_t retval = 0;
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#endif
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fd = (int)(uintptr_t)stream;
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if ( fd < 0 ) {
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return 0;
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}
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#if defined(_MSC_VER)
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retval = 0;
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while ( bytes > 0 ) {
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to_read = 0;
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if ( bytes < (size_t)INT_MAX ) {
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to_read = (int)bytes;
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} else {
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to_read = INT_MAX;
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}
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ret_read = _read( fd, dst, to_read );
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if ( ret_read <= 0 ) {
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return retval;
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}
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bytes -= ret_read;
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retval += ret_read;
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}
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#else
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retval = read( fd, dst, bytes );
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#endif
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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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/*! \brief Provide openmpt_stream_callbacks for standard POSIX file descriptors
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*
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* Fills openmpt_stream_callbacks suitable for passing a POSIX filer descriptor 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*)(uintptr_t)(int)fd`.
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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_fd_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_fd_read_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_FD_H */
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