file_systems/fat/Stream.cpp

110 Stream::_FindCluster(off_t pos, uint32& _cluster)
112 	//TRACE(("FATFS::Stream::%s(%lld,,)\n", __FUNCTION__, pos));
113 	uint32 index = (uint32)(pos / fVolume.ClusterSize());
114 	if (pos > fSize || index >= fClusterCount)
156 Stream::_FindOrCreateCluster(off_t pos, uint32& _cluster, bool& _added)
158 	status_t error = _FindCluster(pos, _cluster);
165 	uint32 index = (uint32)(pos / fVolume.ClusterSize());
212 Stream::FindBlock(off_t pos, off_t &block, off_t &offset)
215 	status_t error = _FindCluster(pos, cluster);
221 	offset += (pos %= fVolume.ClusterSize());
232 Stream::ReadAt(off_t pos, void *_buffer, size_t *_length, off_t *diskOffset)
234 	TRACE(("FATFS::Stream::%s(%lld, )\n", __FUNCTION__, pos));
238 	// set/check boundaries for pos/length
239 	if (pos < 0)
241 	if (pos >= fSize) {
257 	if (pos + (off_t)length > fSize)
258 		length = fSize - pos;
262 	if (FindBlock(pos, num, offset) < B_OK) {
277 	// pos % block_size == (pos - offset) % block_size, offset % block_size == 0
278 	if (pos % blockSize != 0) {
285 		bytesRead = blockSize - (pos % blockSize);
289 		memcpy(buffer, block + (pos % blockSize), bytesRead);
290 		pos += bytesRead;
298 		if (FindBlock(pos, num, offset) < B_OK) {
309 		// offset is the offset to the current pos in the block_run
334 		pos += bytes;
336 		if (FindBlock(pos, num, offset) < B_OK) {
348 Stream::WriteAt(off_t pos, const void* _buffer, size_t* _length,
351 	if (pos < 0)
365 		error = _FindOrCreateCluster(pos, cluster, added);
370 		off_t inClusterOffset = pos % fVolume.ClusterSize();
411 		pos += toWrite;
415 		if (pos > fSize)
416 			fSize = pos;