NTSTATUS RtlCompressBufferLZNT1( IN USHORT Engine, IN PUCHAR UncompressedBuffer, IN ULONG UncompressedBufferSize, OUT PUCHAR CompressedBuffer, IN ULONG CompressedBufferSize, IN ULONG UncompressedChunkSize, OUT PULONG FinalCompressedSize, IN PVOID WorkSpace ); Routine Description: This routine takes as input an uncompressed buffer and produces its compressed equivalent provided the compressed data fits within the specified destination buffer. An output variable indicates the number of bytes used to store the compressed buffer. Arguments: UncompressedBuffer - Supplies a pointer to the uncompressed data. UncompressedBufferSize - Supplies the size, in bytes, of the uncompressed buffer. CompressedBuffer - Supplies a pointer to where the compressed data is to be stored. CompressedBufferSize - Supplies the size, in bytes, of the compressed buffer. UncompressedChunkSize - Ignored. FinalCompressedSize - Receives the number of bytes needed in the compressed buffer to store the compressed data. WorkSpace - Mind your own business, just give it to me. Return Value: STATUS_SUCCESS - the compression worked without a hitch. STATUS_BUFFER_ALL_ZEROS - the compression worked without a hitch and in addition the input buffer was all zeros. STATUS_BUFFER_TOO_SMALL - the compressed buffer is too small to hold the compressed data.