private void WriteDeltaObjectReuse(ObjectToPack otp, PackedObjectLoader reuse)
{
if (DeltaBaseAsOffset && otp.DeltaBase != null)
{
WriteObjectHeader(Constants.OBJ_OFS_DELTA, reuse.RawSize);
ObjectToPack deltaBase = otp.DeltaBase;
long offsetDiff = otp.Offset - deltaBase.Offset;
int localPos = _buf.Length - 1;
_buf[localPos] = (byte)(offsetDiff & 0x7F);
while ((offsetDiff >>= 7) > 0)
{
_buf[--localPos] = (byte)(0x80 | (--offsetDiff & 0x7F));
}
_pos.Write(_buf, localPos, _buf.Length - localPos);
}
else
{
WriteObjectHeader(Constants.OBJ_REF_DELTA, reuse.RawSize);
otp.DeltaBaseId.copyRawTo(_buf, 0);
_pos.Write(_buf, 0, Constants.OBJECT_ID_LENGTH);
}
reuse.CopyRawData(_pos, _buf, _windowCursor);
}
private void WriteObject(ObjectToPack otp)
{
otp.MarkWantWrite();
if (otp.IsDeltaRepresentation)
{
ObjectToPack deltaBase = otp.DeltaBase;
Debug.Assert(deltaBase != null || Thin);
if (deltaBase != null && !deltaBase.IsWritten)
{
if (deltaBase.WantWrite)
{
otp.ClearDeltaBase();
otp.DisposeLoader();
}
else
{
WriteObject(deltaBase);
}
}
}
Debug.Assert(!otp.IsWritten);
_pos.resetCRC32();
otp.Offset = _pos.Length;
PackedObjectLoader reuse = Open(otp);
if (reuse != null)
{
try
{
if (otp.IsDeltaRepresentation)
{
WriteDeltaObjectReuse(otp, reuse);
}
else
{
WriteObjectHeader(otp.Type, reuse.Size);
reuse.CopyRawData(_pos, _buf, _windowCursor);
}
}
finally
{
reuse.endCopyRawData();
}
}
else if (otp.IsDeltaRepresentation)
{
throw new IOException("creating deltas is not implemented");
}
else
{
WriteWholeObjectDeflate(otp);
}
otp.CRC = _pos.getCRC32();
_writeMonitor.Update(1);
}
