fstream.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef M4_FILEIO_FSTREAM_H
#define M4_FILEIO_FSTREAM_H

#include "common/file.h"
#include "m4/fileio/sys_file.h"
#include "m4/mem/reloc.h"
#include "m4/m4_types.h"

namespace M4 {

class StreamFile {
private:
    Common::File _file;
public:
    StreamFile(const Common::Path &filename);
    ~StreamFile() {}

    int32 read(Handle bufferHandle, int32 n);
    bool seek(uint32 n);
    bool seek_ahead(int32 n);
    uint32 get_pos();
};

struct strmRequest {
    strmRequest *next;
    strmRequest *prev;
    SysFile *srcFile;
    int32 strmSize;
    MemHandle strmHandle;
    uint8 *strmBuff;
    uint8 *endStrmBuff;
    uint8 *strmHead;
    uint8 *strmTail;
    uint8 *strmWrap;
    uint8 *strmLastRead;
    int32 nextReadSize;
    int32 numBlocksToRead;
    int32 *blockSizeArray;
    bool wrapStream;
};

bool f_stream_Init();
void f_stream_Shutdown();

strmRequest *f_stream_Open(SysFile *srcFile, int32 fileOffset, int32 strmMinBuffSize, int32 strmBuffSize,
    int32 numBlocksToRead, int32 *blockSizeArray, int32 initialRead, bool wrapStream);
int32 f_stream_Read(strmRequest *myStream, uint8 **dest, int32 numBytes);
void f_stream_Close(strmRequest *myStream);
void f_stream_Process(int32 numToProcess);

} // namespace M4

#endif