KFreonLib.Helpers.SaltLZOHelper.CompressChunk C# (CSharp) Method

        public byte[] CompressChunk(Chunk chunk)
        {
            int numBlocks = (chunk.Uncompressed.Length + maxBlockSize - 1) / maxBlockSize;
            if (numBlocks > 8)
                throw new FormatException("Maximum block number exceeded");
            ChunkHeader head = new ChunkHeader();
            head.magic = -1641380927;
            head.blocksize = maxBlockSize;
            head.uncompressedsize = chunk.Uncompressed.Length;
            int pos = 0;
            MemoryStream mem = new MemoryStream();
            List<Block> blockList = new List<Block>();
            int startData = 16 + 8 * numBlocks;
            mem.Seek(startData, SeekOrigin.Begin);
            for (int i = 0; i < numBlocks; i++)
            {
                Block block = new Block();
                byte[] result, temp;
                if (i != numBlocks - 1)
                {
                    block.uncompressedsize = maxBlockSize;
                    temp = new byte[maxBlockSize];
                }
                else
                {
                    block.uncompressedsize = head.uncompressedsize - pos;
                    temp = new byte[block.uncompressedsize];
                }

                Buffer.BlockCopy(chunk.Uncompressed, pos, temp, 0, temp.Length);
                result = LZO1X.Compress(temp);
                if (result.Length == 0)
                    throw new Exception("LZO compression error!");
                block.compressedsize = result.Length;
                mem.WriteBytes(result);
                blockList.Add(block);
                pos += maxBlockSize;
            }
            head.compressedsize = (int)mem.Length;

            mem.Seek(0, SeekOrigin.Begin);
            mem.WriteValueS32(head.magic);
            mem.WriteValueS32(head.blocksize);
            mem.WriteValueS32(head.compressedsize);
            mem.WriteValueS32(head.uncompressedsize);
            foreach (Block block in blockList)
            {
                mem.WriteValueS32(block.compressedsize);
                mem.WriteValueS32(block.uncompressedsize);
            }

            return mem.ToArray();

        }
    }