Ejemplo n.º 1
0
        public Lz4FrameInfo(byte flags)
        {
            int version = flags >> 6;

            if (version != 1)
            {
                throw Lz4Compressor.InvalidData();
            }
            IndependentBlocks  = 0 != (flags & 0x20);
            HasBlockChecksum   = 0 != (flags & 0x10);
            HasContentLength   = 0 != (flags & 8);
            HasContentChecksum = 0 != (flags & 4);
            HasDictionary      = 0 != (flags & 1);
        }
Ejemplo n.º 2
0
        void ReadNextBlock()
        {
            if (4 != BaseStream.Read(m_block_header, 0, 4))
            {
                throw new EndOfStreamException();
            }
            int block_size = LittleEndian.ToInt32(m_block_header, 0);

            if (0 == block_size)
            {
                m_eof       = true;
                m_data_size = 0;
                if (m_info.HasContentChecksum)
                {
                    ReadChecksum();
                }
            }
            else if (block_size < 0)
            {
                m_data_size = block_size & 0x7FFFFFFF;
                if (m_data_size > m_data.Length)
                {
                    m_data = new byte[m_data_size];
                }
                m_data_size = BaseStream.Read(m_data, 0, m_data_size);
                if (m_info.HasBlockChecksum)
                {
                    ReadChecksum();
                }
            }
            else
            {
                m_block_size = block_size;
                if (null == m_block || m_block_size > m_block.Length)
                {
                    m_block = new byte[m_block_size];
                }
                if (m_block_size != BaseStream.Read(m_block, 0, m_block_size))
                {
                    throw new EndOfStreamException();
                }
                m_data_size = Lz4Compressor.DecompressBlock(m_block, m_block_size, m_data, m_data.Length);
                if (m_info.HasBlockChecksum)
                {
                    ReadChecksum();
                }
            }
            m_data_pos = 0;
        }
Ejemplo n.º 3
0
        public void SetBlockSize(int code)
        {
            switch ((code >> 4) & 7)
            {
            case 4: BlockSize = 0x10000; break;

            case 5: BlockSize = 0x40000; break;

            case 6: BlockSize = 0x100000; break;

            case 7: BlockSize = 0x400000; break;

            default: throw Lz4Compressor.InvalidData();
            }
        }