/// <exception cref="System.IO.IOException"></exception>
internal virtual LocalObjectRepresentation Representation(WindowCursor curs, AnyObjectId
objectId)
{
long pos = Idx().FindOffset(objectId);
if (pos < 0)
{
return(null);
}
byte[] ib = curs.tempId;
ReadFully(pos, ib, 0, 20, curs);
int c = ib[0] & unchecked ((int)(0xff));
int p = 1;
int typeCode = (c >> 4) & 7;
while ((c & unchecked ((int)(0x80))) != 0)
{
c = ib[p++] & unchecked ((int)(0xff));
}
long len = (FindEndOffset(pos) - pos);
switch (typeCode)
{
case Constants.OBJ_COMMIT:
case Constants.OBJ_TREE:
case Constants.OBJ_BLOB:
case Constants.OBJ_TAG:
{
return(LocalObjectRepresentation.NewWhole(this, pos, len - p));
}
case Constants.OBJ_OFS_DELTA:
{
c = ib[p++] & unchecked ((int)(0xff));
long ofs = c & 127;
while ((c & 128) != 0)
{
ofs += 1;
c = ib[p++] & unchecked ((int)(0xff));
ofs <<= 7;
ofs += (c & 127);
}
ofs = pos - ofs;
return(LocalObjectRepresentation.NewDelta(this, pos, len - p, ofs));
}
case Constants.OBJ_REF_DELTA:
{
len -= p;
len -= Constants.OBJECT_ID_LENGTH;
ReadFully(pos + p, ib, 0, 20, curs);
ObjectId id = ObjectId.FromRaw(ib);
return(LocalObjectRepresentation.NewDelta(this, pos, len, id));
}
default:
{
throw new IOException(MessageFormat.Format(JGitText.Get().unknownObjectType, Sharpen.Extensions.ValueOf
(typeCode)));
}
}
}
