private int ReadFrag(int pos, byte[] buffer, int offset, int count)
{
int fragRecordsPerBlock = 8192 / FragmentRecord.RecordSize;
int fragTable = (int)_inode.FragmentKey / fragRecordsPerBlock;
int recordOffset = (int)(_inode.FragmentKey % fragRecordsPerBlock) * FragmentRecord.RecordSize;
byte[] fragRecordData = new byte[FragmentRecord.RecordSize];
_context.FragmentTableReaders[fragTable].SetPosition(0, recordOffset);
_context.FragmentTableReaders[fragTable].Read(fragRecordData, 0, fragRecordData.Length);
FragmentRecord fragRecord = new FragmentRecord();
fragRecord.ReadFrom(fragRecordData, 0);
Block frag = _context.ReadBlock(fragRecord.StartBlock, fragRecord.CompressedSize);
// Attempt to read data beyond end of fragment
if (pos > frag.Available)
{
return(0);
}
int toCopy = (int)Math.Min(frag.Available - (_inode.FragmentOffset + pos), count);
Array.Copy(frag.Data, _inode.FragmentOffset + pos, buffer, offset, toCopy);
return(toCopy);
}
private void NextBlock()
{
long position = _context.RawStream.Position;
uint writeLen = _context.WriteDataBlock(_currentBlock, 0, _currentOffset);
FragmentRecord blockRecord = new FragmentRecord()
{
StartBlock = position,
CompressedSize = (int)writeLen
};
_fragmentBlocks.Add(blockRecord);
}
private void NextBlock()
{
long position = _context.RawStream.Position;
uint writeLen = _context.WriteDataBlock(_currentBlock, 0, _currentOffset);
FragmentRecord blockRecord = new FragmentRecord()
{
StartBlock = position,
CompressedSize = (int)writeLen
};
_fragmentBlocks.Add(blockRecord);
}
private int ReadFrag(int pos, byte[] buffer, int offset, int count)
{
int fragRecordsPerBlock = 8192 / FragmentRecord.RecordSize;
int fragTable = (int)_inode.FragmentKey / fragRecordsPerBlock;
int recordOffset = (int)(_inode.FragmentKey % fragRecordsPerBlock) * FragmentRecord.RecordSize;
byte[] fragRecordData = new byte[FragmentRecord.RecordSize];
_context.FragmentTableReaders[fragTable].SetPosition(0, recordOffset);
_context.FragmentTableReaders[fragTable].Read(fragRecordData, 0, fragRecordData.Length);
FragmentRecord fragRecord = new FragmentRecord();
fragRecord.ReadFrom(fragRecordData, 0);
Block frag = _context.ReadBlock(fragRecord.StartBlock, fragRecord.CompressedSize);
// Attempt to read data beyond end of fragment
if (pos > frag.Available)
{
return 0;
}
int toCopy = (int)Math.Min(frag.Available - (_inode.FragmentOffset + pos), count);
Array.Copy(frag.Data, _inode.FragmentOffset + pos, buffer, offset, toCopy);
return toCopy;
}