340 lines
12 KiB
C#
340 lines
12 KiB
C#
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//
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// http://forum.unity3d.com/threads/lzf-compression-and-decompression-for-unity.152579/
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//
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/*
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* Improved version to C# LibLZF Port:
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* Copyright (c) 2010 Roman Atachiants <kelindar@gmail.com>
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*
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* Original CLZF Port:
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* Copyright (c) 2005 Oren J. Maurice <oymaurice@hazorea.org.il>
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*
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* Original LibLZF Library Algorithm:
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* Copyright (c) 2000-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License version 2 (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of the above. If you wish to
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* allow the use of your version of this file only under the terms of the
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* GPL and not to allow others to use your version of this file under the
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* BSD license, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the GPL. If
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* you do not delete the provisions above, a recipient may use your version
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* of this file under either the BSD or the GPL.
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*/
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/* Benchmark with Alice29 Canterbury Corpus
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---------------------------------------
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(Compression) Original CLZF C#
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Raw = 152089, Compressed = 101092
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8292,4743 ms.
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---------------------------------------
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(Compression) My LZF C#
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Raw = 152089, Compressed = 101092
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33,0019 ms.
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---------------------------------------
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(Compression) Zlib using SharpZipLib
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Raw = 152089, Compressed = 54388
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8389,4799 ms.
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---------------------------------------
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(Compression) QuickLZ C#
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Raw = 152089, Compressed = 83494
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80,0046 ms.
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---------------------------------------
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(Decompression) Original CLZF C#
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Decompressed = 152089
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16,0009 ms.
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---------------------------------------
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(Decompression) My LZF C#
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Decompressed = 152089
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15,0009 ms.
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---------------------------------------
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(Decompression) Zlib using SharpZipLib
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Decompressed = 152089
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3577,2046 ms.
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---------------------------------------
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(Decompression) QuickLZ C#
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Decompressed = 152089
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21,0012 ms.
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*/
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using System;
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namespace UnityEngine.UI.Extensions
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{
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/// <summary>
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/// Improved C# LZF Compressor, a very small data compression library. The compression algorithm is extremely fast.
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/// Note for strings, ensure you only use Unicode else special characters may get corrupted.
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public static class CLZF2
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{
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private static readonly uint HLOG = 14;
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private static readonly uint HSIZE = (1 << 14);
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private static readonly uint MAX_LIT = (1 << 5);
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private static readonly uint MAX_OFF = (1 << 13);
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private static readonly uint MAX_REF = ((1 << 8) + (1 << 3));
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/// <summary>
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/// Hashtable, that can be allocated only once
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/// </summary>
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private static readonly long[] HashTable = new long[HSIZE];
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// Compresses inputBytes
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public static byte[] Compress(byte[] inputBytes)
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{
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// Starting guess, increase it later if needed
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int outputByteCountGuess = inputBytes.Length * 2;
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byte[] tempBuffer = new byte[outputByteCountGuess];
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int byteCount = lzf_compress(inputBytes, ref tempBuffer);
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// If byteCount is 0, then increase buffer and try again
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while (byteCount == 0)
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{
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outputByteCountGuess *= 2;
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tempBuffer = new byte[outputByteCountGuess];
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byteCount = lzf_compress(inputBytes, ref tempBuffer);
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}
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byte[] outputBytes = new byte[byteCount];
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Buffer.BlockCopy(tempBuffer, 0, outputBytes, 0, byteCount);
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return outputBytes;
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}
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// Decompress outputBytes
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public static byte[] Decompress(byte[] inputBytes)
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{
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// Starting guess, increase it later if needed
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int outputByteCountGuess = inputBytes.Length * 2;
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byte[] tempBuffer = new byte[outputByteCountGuess];
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int byteCount = lzf_decompress(inputBytes, ref tempBuffer);
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// If byteCount is 0, then increase buffer and try again
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while (byteCount == 0)
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{
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outputByteCountGuess *= 2;
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tempBuffer = new byte[outputByteCountGuess];
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byteCount = lzf_decompress(inputBytes, ref tempBuffer);
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}
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byte[] outputBytes = new byte[byteCount];
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Buffer.BlockCopy(tempBuffer, 0, outputBytes, 0, byteCount);
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return outputBytes;
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}
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/// <summary>
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/// Compresses the data using LibLZF algorithm
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/// </summary>
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/// <param name="input">Reference to the data to compress</param>
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/// <param name="output">Reference to a buffer which will contain the compressed data</param>
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/// <returns>The size of the compressed archive in the output buffer</returns>
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public static int lzf_compress(byte[] input, ref byte[] output)
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{
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int inputLength = input.Length;
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int outputLength = output.Length;
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Array.Clear(HashTable, 0, (int)HSIZE);
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long hslot;
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uint iidx = 0;
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uint oidx = 0;
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long reference;
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uint hval = (uint)(((input[iidx]) << 8) | input[iidx + 1]); // FRST(in_data, iidx);
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long off;
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int lit = 0;
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for (;;)
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{
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if (iidx < inputLength - 2)
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{
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hval = (hval << 8) | input[iidx + 2];
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hslot = ((hval ^ (hval << 5)) >> (int)(((3 * 8 - HLOG)) - hval * 5) & (HSIZE - 1));
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reference = HashTable[hslot];
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HashTable[hslot] = (long)iidx;
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if ((off = iidx - reference - 1) < MAX_OFF
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&& iidx + 4 < inputLength
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&& reference > 0
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&& input[reference + 0] == input[iidx + 0]
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&& input[reference + 1] == input[iidx + 1]
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&& input[reference + 2] == input[iidx + 2]
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)
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{
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/* match found at *reference++ */
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uint len = 2;
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uint maxlen = (uint)inputLength - iidx - len;
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maxlen = maxlen > MAX_REF ? MAX_REF : maxlen;
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if (oidx + lit + 1 + 3 >= outputLength)
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return 0;
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do
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len++;
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while (len < maxlen && input[reference + len] == input[iidx + len]);
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if (lit != 0)
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{
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output[oidx++] = (byte)(lit - 1);
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lit = -lit;
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do
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output[oidx++] = input[iidx + lit];
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while ((++lit) != 0);
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}
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len -= 2;
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iidx++;
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if (len < 7)
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{
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output[oidx++] = (byte)((off >> 8) + (len << 5));
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}
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else
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{
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output[oidx++] = (byte)((off >> 8) + (7 << 5));
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output[oidx++] = (byte)(len - 7);
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}
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output[oidx++] = (byte)off;
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iidx += len - 1;
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hval = (uint)(((input[iidx]) << 8) | input[iidx + 1]);
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hval = (hval << 8) | input[iidx + 2];
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HashTable[((hval ^ (hval << 5)) >> (int)(((3 * 8 - HLOG)) - hval * 5) & (HSIZE - 1))] = iidx;
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iidx++;
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hval = (hval << 8) | input[iidx + 2];
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HashTable[((hval ^ (hval << 5)) >> (int)(((3 * 8 - HLOG)) - hval * 5) & (HSIZE - 1))] = iidx;
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iidx++;
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continue;
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}
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}
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else if (iidx == inputLength)
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break;
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/* one more literal byte we must copy */
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lit++;
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iidx++;
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if (lit == MAX_LIT)
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{
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if (oidx + 1 + MAX_LIT >= outputLength)
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return 0;
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output[oidx++] = (byte)(MAX_LIT - 1);
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lit = -lit;
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do
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output[oidx++] = input[iidx + lit];
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while ((++lit) != 0);
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}
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}
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if (lit != 0)
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{
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if (oidx + lit + 1 >= outputLength)
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return 0;
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output[oidx++] = (byte)(lit - 1);
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lit = -lit;
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do
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output[oidx++] = input[iidx + lit];
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while ((++lit) != 0);
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}
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return (int)oidx;
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}
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/// <summary>
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/// Decompresses the data using LibLZF algorithm
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/// </summary>
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/// <param name="input">Reference to the data to decompress</param>
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/// <param name="output">Reference to a buffer which will contain the decompressed data</param>
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/// <returns>Returns decompressed size</returns>
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public static int lzf_decompress(byte[] input, ref byte[] output)
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{
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int inputLength = input.Length;
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int outputLength = output.Length;
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uint iidx = 0;
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uint oidx = 0;
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do
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{
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uint ctrl = input[iidx++];
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if (ctrl < (1 << 5)) /* literal run */
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{
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ctrl++;
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if (oidx + ctrl > outputLength)
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{
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//SET_ERRNO (E2BIG);
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return 0;
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}
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do
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output[oidx++] = input[iidx++];
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while ((--ctrl) != 0);
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}
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else /* back reference */
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{
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uint len = ctrl >> 5;
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int reference = (int)(oidx - ((ctrl & 0x1f) << 8) - 1);
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if (len == 7)
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len += input[iidx++];
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reference -= input[iidx++];
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if (oidx + len + 2 > outputLength)
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{
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//SET_ERRNO (E2BIG);
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return 0;
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}
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if (reference < 0)
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{
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//SET_ERRNO (EINVAL);
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return 0;
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}
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output[oidx++] = output[reference++];
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output[oidx++] = output[reference++];
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do
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output[oidx++] = output[reference++];
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while ((--len) != 0);
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}
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}
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while (iidx < inputLength);
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return (int)oidx;
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}
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}
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}
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