/// <summary>Commits the object header onto the stream.</summary>
/// <remarks>
/// Commits the object header onto the stream.
/// <p>
/// Once the header has been written, the object representation must be fully
/// output, or packing must abort abnormally.
/// </remarks>
/// <param name="otp">the object to pack. Header information is obtained.</param>
/// <param name="rawLength">
/// number of bytes of the inflated content. For an object that is
/// in whole object format, this is the same as the object size.
/// For an object that is in a delta format, this is the size of
/// the inflated delta instruction stream.
/// </param>
/// <exception cref="System.IO.IOException">the underlying stream refused to accept the header.
/// </exception>
public void WriteHeader(ObjectToPack otp, long rawLength)
{
if (otp.IsDeltaRepresentation())
{
if (packWriter.IsDeltaBaseAsOffset())
{
ObjectToPack baseInPack = otp.GetDeltaBase();
if (baseInPack != null && baseInPack.IsWritten())
{
long start = count;
int n = EncodeTypeSize(Constants.OBJ_OFS_DELTA, rawLength);
Write(headerBuffer, 0, n);
long offsetDiff = start - baseInPack.GetOffset();
n = headerBuffer.Length - 1;
headerBuffer[n] = unchecked ((byte)(offsetDiff & unchecked ((int)(0x7F))));
while ((offsetDiff >>= 7) > 0)
{
headerBuffer[--n] = unchecked ((byte)(unchecked ((int)(0x80)) | (--offsetDiff & unchecked (
(int)(0x7F)))));
}
Write(headerBuffer, n, headerBuffer.Length - n);
return;
}
}
int n_1 = EncodeTypeSize(Constants.OBJ_REF_DELTA, rawLength);
otp.GetDeltaBaseId().CopyRawTo(headerBuffer, n_1);
Write(headerBuffer, 0, n_1 + Constants.OBJECT_ID_LENGTH);
}
else
{
int n = EncodeTypeSize(otp.GetType(), rawLength);
Write(headerBuffer, 0, n);
}
}
