private UnpackedObjectLoader(byte[] compressed, AnyObjectId id)
{
// Try to determine if this is a legacy format loose object or
// a new style loose object. The legacy format was completely
// compressed with zlib so the first byte must be 0x78 (15-bit
// window size, deflated) and the first 16 bit word must be
// evenly divisible by 31. Otherwise its a new style loose
// object.
//
Inflater inflater = InflaterCache.Instance.get();
try
{
int fb = compressed[0] & 0xff;
if (fb == 0x78 && (((fb << 8) | compressed[1] & 0xff) % 31) == 0)
{
inflater.SetInput(compressed);
var hdr = new byte[64];
int avail = 0;
while (!inflater.IsFinished && avail < hdr.Length)
{
try
{
avail += inflater.Inflate(hdr, avail, hdr.Length - avail);
}
catch (IOException dfe)
{
var coe = new CorruptObjectException(id, "bad stream", dfe);
//inflater.end();
throw coe;
}
}
if (avail < 5)
{
throw new CorruptObjectException(id, "no header");
}
var p = new MutableInteger();
_objectType = Constants.decodeTypeString(id, hdr, (byte)' ', p);
_objectSize = RawParseUtils.parseBase10(hdr, p.value, p);
if (_objectSize < 0)
{
throw new CorruptObjectException(id, "negative size");
}
if (hdr[p.value++] != 0)
{
throw new CorruptObjectException(id, "garbage after size");
}
_bytes = new byte[_objectSize];
if (p.value < avail)
{
Array.Copy(hdr, p.value, _bytes, 0, avail - p.value);
}
Decompress(id, inflater, avail - p.value);
}
else
{
int p = 0;
int c = compressed[p++] & 0xff;
int typeCode = (c >> 4) & 7;
int size = c & 15;
int shift = 4;
while ((c & 0x80) != 0)
{
c = compressed[p++] & 0xff;
size += (c & 0x7f) << shift;
shift += 7;
}
switch (typeCode)
{
case Constants.OBJ_COMMIT:
case Constants.OBJ_TREE:
case Constants.OBJ_BLOB:
case Constants.OBJ_TAG:
_objectType = typeCode;
break;
default:
throw new CorruptObjectException(id, "invalid type");
}
_objectSize = size;
_bytes = new byte[_objectSize];
inflater.SetInput(compressed, p, compressed.Length - p);
Decompress(id, inflater, 0);
}
}
finally
{
InflaterCache.Instance.release(inflater);
}
}
private void Decompress(AnyObjectId id, Inflater inf, int p)
{
try
{
while (!inf.IsFinished)
{
p += inf.Inflate(_bytes, p, _objectSize - p);
}
}
catch (IOException dfe)
{
var coe = new CorruptObjectException(id, "bad stream", dfe);
throw coe;
}
if (p != _objectSize)
{
throw new CorruptObjectException(id, "incorrect Length");
}
}
