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294 lines
11 KiB
C#
294 lines
11 KiB
C#
//! \file Lz4Stream.cs
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//! \date Fri Jan 13 20:45:26 2017
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//! \brief LZ4 - Fast LZ compression algorithm
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//
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// Copyright (C) 2011-2016, Yann Collet.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// C# implementation Copyright (C) 2017 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Compression
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{
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public class Lz4FrameInfo
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{
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public int BlockSize;
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public bool IndependentBlocks;
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public bool HasBlockChecksum;
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public bool HasContentLength;
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public bool HasContentChecksum;
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public bool HasDictionary;
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public long OriginalLength;
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public int DictionaryId;
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public Lz4FrameInfo ()
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{
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}
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public Lz4FrameInfo (byte flags)
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{
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int version = flags >> 6;
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if (version != 1)
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throw Lz4Stream.InvalidData();
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IndependentBlocks = 0 != (flags & 0x20);
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HasBlockChecksum = 0 != (flags & 0x10);
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HasContentLength = 0 != (flags & 8);
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HasContentChecksum = 0 != (flags & 4);
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HasDictionary = 0 != (flags & 1);
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}
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public void SetBlockSize (int code)
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{
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switch ((code >> 4) & 7)
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{
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case 4: BlockSize = 0x10000; break;
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case 5: BlockSize = 0x40000; break;
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case 6: BlockSize = 0x100000; break;
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case 7: BlockSize = 0x400000; break;
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default: throw Lz4Stream.InvalidData();
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}
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}
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}
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public class Lz4Stream : GameRes.Formats.InputProxyStream
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{
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Lz4FrameInfo m_info;
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readonly byte[] m_block_header;
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byte[] m_block;
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int m_block_size;
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byte[] m_data;
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int m_data_size;
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int m_data_pos;
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bool m_eof;
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public Lz4Stream (Stream input, Lz4FrameInfo info, bool leave_open = false) : base (input, leave_open)
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{
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if (null == info)
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throw new ArgumentNullException ("info");
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if (info.BlockSize <= 0)
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throw new ArgumentOutOfRangeException ("info.BlockSize");
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if (!info.IndependentBlocks)
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throw new NotImplementedException ("LZ4 compression with linked blocks not implemented.");
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if (info.HasDictionary)
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throw new NotImplementedException ("LZ4 compression with dictionary not implemented.");
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m_info = info;
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m_block_header = new byte[4];
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m_data = new byte[m_info.BlockSize];
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m_data_size = 0;
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m_data_pos = 0;
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m_eof = false;
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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int total_read = 0;
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while (count > 0)
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{
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if (m_data_pos < m_data_size)
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{
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int available = Math.Min (m_data_size - m_data_pos, count);
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Buffer.BlockCopy (m_data, m_data_pos, buffer, offset, available);
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total_read += available;
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m_data_pos += available;
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offset += available;
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count -= available;
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}
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else if (m_eof)
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break;
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else
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ReadNextBlock();
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}
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return total_read;
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}
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void ReadNextBlock ()
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{
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if (4 != BaseStream.Read (m_block_header, 0, 4))
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throw new EndOfStreamException();
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int block_size = LittleEndian.ToInt32 (m_block_header, 0);
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if (0 == block_size)
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{
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m_eof = true;
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m_data_size = 0;
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if (m_info.HasContentChecksum)
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ReadChecksum();
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}
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else if (block_size < 0)
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{
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m_data_size = block_size & 0x7FFFFFFF;
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if (m_data_size > m_data.Length)
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m_data = new byte[m_data_size];
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m_data_size = BaseStream.Read (m_data, 0, m_data_size);
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if (m_info.HasBlockChecksum)
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ReadChecksum();
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}
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else
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{
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m_block_size = block_size;
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if (null == m_block || m_block_size > m_block.Length)
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m_block = new byte[m_block_size];
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if (m_block_size != BaseStream.Read (m_block, 0, m_block_size))
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throw new EndOfStreamException();
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m_data_size = DecompressBlock();
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if (m_info.HasBlockChecksum)
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ReadChecksum();
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}
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m_data_pos = 0;
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}
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void ReadChecksum ()
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{
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if (4 != BaseStream.Read (m_block_header, 0, 4))
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throw new EndOfStreamException();
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// XXX checksum is ignored
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}
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const int LastLiterals = 5;
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const int MFLimit = 12;
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int DecompressBlock ()
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{
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int src = 0;
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int iend = m_block_size;
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int dst = 0;
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int oend = m_data.Length;
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for (;;)
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{
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/* get literal length */
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int token = m_block[src++];
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int length = token >> 4;
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if (0xF == length)
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{
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int n;
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do
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{
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n = m_block[src++];
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length += n;
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}
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while ((src < iend - 0xF) && (0xFF == n));
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if (dst + length < dst || src + length < src) // overflow detection
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throw InvalidData();
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}
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/* copy literals */
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int copy_end = dst + length;
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if ((copy_end > oend - MFLimit) || (src + length > iend - (3+LastLiterals)))
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{
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if ((src + length != iend) || copy_end > oend)
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throw InvalidData();
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Buffer.BlockCopy (m_block, src, m_data, dst, length);
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src += length;
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dst += length;
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break;
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}
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Buffer.BlockCopy (m_block, src, m_data, dst, length);
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src += length;
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dst = copy_end;
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/* get offset */
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int offset = LittleEndian.ToUInt16 (m_block, src);
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src += 2;
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int match = dst - offset;
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if (match < 0)
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throw InvalidData();
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/* get matchlength */
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length = token & 0xF;
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if (0xF == length)
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{
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int n;
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do
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{
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n = m_block[src++];
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if (src > iend - LastLiterals)
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throw InvalidData();
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length += n;
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}
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while (0xFF == n);
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if (dst + length < dst) // overflow detection
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throw InvalidData();
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}
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length += 4;
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/* copy match within block */
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Binary.CopyOverlapped (m_data, match, dst, length);
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dst += length;
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}
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return dst; // number of output bytes decoded
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}
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internal static InvalidDataException InvalidData ()
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{
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return new InvalidDataException ("Invalid LZ4 compressed stream.");
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}
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#region Not supported IO.Stream methods
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public override bool CanSeek { get { return false; } }
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public override long Length
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{
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get { throw new NotSupportedException ("Lz4Stream.Length property is not supported"); }
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}
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public override long Position
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{
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get { throw new NotSupportedException ("Lz4Stream.Position property is not supported"); }
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set { throw new NotSupportedException ("Lz4Stream.Position property is not supported"); }
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}
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public override void Flush()
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{
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ("Lz4Stream.Seek method is not supported");
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}
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#endregion
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}
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}
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