* Copyright 2008, Haiku, Inc.
* Distributed under the terms of the MIT License.
*
* Authors:
* François Revol <revol@free.fr>
*/
#ifndef STREAM_H
#define STREAM_H
#include "fatfs.h"
#include "Volume.h"
#include <sys/stat.h>
#define CLUSTER_MAP_CACHE_SIZE 50
class Node;
struct file_map_run;
namespace FATFS {
class Stream {
public:
Stream(Volume &volume, uint32 chain, off_t size, const char *name);
~Stream();
status_t InitCheck();
Volume &GetVolume() const { return fVolume; }
status_t GetName(char *nameBuffer, size_t bufferSize) const;
status_t GetFileMap(struct file_map_run *runs, int32 *count);
off_t Size() const { return fSize; }
uint32 FirstCluster() const { return fFirstCluster; }
void SetSize(off_t size) { fSize = size; }
status_t ReadAt(off_t pos, void *buffer, size_t *length,
off_t *diskOffset = NULL);
status_t WriteAt(off_t pos, const void *buffer, size_t *length,
off_t *diskOffset = NULL);
private:
status_t BuildClusterList();
status_t _FindCluster(off_t pos, uint32& _cluster);
status_t _FindOrCreateCluster(off_t pos, uint32& _cluster,
bool& _added);
status_t FindBlock(off_t pos, off_t &block, off_t &offset);
Volume &fVolume;
uint32 fFirstCluster;
uint32 fClusterCount;
struct {
off_t block;
uint32 cluster;
} fClusterMapCache[CLUSTER_MAP_CACHE_SIZE];
int fClusterMapCacheLast;
off_t fSize;
char fName[FATFS_NAME_LENGTH+1];
};
}
#endif
