Aegisub/FFmpegSource2/stdiostream.h

81 lines
2.6 KiB
C

// Copyright (c) 2007-2008 Fredrik Mellbin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef STDIOSTREAM_H
#define STDIOSTREAM_H
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "MatroskaParser.h"
#define CACHESIZE 65536
/************\
* Structures *
\************/
/* first we need to create an I/O object that the parser will use to read the
* source file
*/
struct StdIoStream {
struct InputStream base;
FILE *fp;
int error;
};
typedef struct StdIoStream StdIoStream;
/***********\
* Functions *
\***********/
/* read count bytes into buffer starting at file position pos
* return the number of bytes read, -1 on error or 0 on EOF
*/
int StdIoRead(StdIoStream *st, ulonglong pos, void *buffer, int count);
/* scan for a signature sig(big-endian) starting at file position pos
* return position of the first byte of signature or -1 if error/not found
*/
longlong StdIoScan(StdIoStream *st, ulonglong start, unsigned signature);
/* return cache size, this is used to limit readahead */
unsigned StdIoGetCacheSize(StdIoStream *st);
/* return last error message */
const char *StdIoGetLastError(StdIoStream *st);
/* memory allocation, this is done via stdlib */
void *StdIoMalloc(StdIoStream *st, size_t size);
void *StdIoRealloc(StdIoStream *st, void *mem, size_t size);
void StdIoFree(StdIoStream *st, void *mem);
/* progress report handler for lengthy operations
* returns 0 to abort operation, nonzero to continue
*/
int StdIoProgress(StdIoStream *st, ulonglong cur, ulonglong max);
void InitStdIoStream(StdIoStream *st);
#endif /* #ifndef STDIOSTREAM_H */