| 1 | /*
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| 2 | * Copyright (c) 2005 Oren J. Maurice <[email protected]>
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without modifica-
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| 5 | * tion, are permitted provided that the following conditions are met:
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| 6 | *
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| 7 | * 1. Redistributions of source code must retain the above copyright notice,
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| 8 | * this list of conditions and the following disclaimer.
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| 9 | *
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | *
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| 14 | * 3. The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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| 19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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| 21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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| 25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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| 26 | * OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | *
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| 28 | * Alternatively, the contents of this file may be used under the terms of
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| 29 | * the GNU General Public License version 2 (the "GPL"), in which case the
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| 30 | * provisions of the GPL are applicable instead of the above. If you wish to
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| 31 | * allow the use of your version of this file only under the terms of the
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| 32 | * GPL and not to allow others to use your version of this file under the
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| 33 | * BSD license, indicate your decision by deleting the provisions above and
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| 34 | * replace them with the notice and other provisions required by the GPL. If
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| 35 | * you do not delete the provisions above, a recipient may use your version
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| 36 | * of this file under either the BSD or the GPL.
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| 37 | */
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| 38 |
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| 39 | using System;
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| 40 |
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| 41 | namespace LZF.NET
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| 42 | {
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| 43 |
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| 44 | /// <summary>
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| 45 | /// Summary description for CLZF.
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| 46 | /// </summary>
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| 47 | public class CLZF
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| 48 | {
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| 49 | // CRC32 data & function
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| 50 | UInt32 []crc_32_tab = new UInt32[256]
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| 51 | {
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| 52 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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| 53 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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| 54 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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| 55 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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| 56 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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| 57 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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| 58 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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| 59 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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| 60 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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| 61 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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| 62 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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| 63 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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| 64 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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| 65 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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| 66 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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| 67 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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| 68 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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| 69 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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| 70 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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| 71 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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| 72 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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| 73 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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| 74 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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| 75 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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| 76 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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| 77 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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| 78 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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| 79 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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| 80 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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| 81 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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| 82 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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| 83 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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| 84 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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| 85 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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| 86 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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| 87 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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| 88 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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| 89 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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| 90 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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| 91 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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| 92 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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| 93 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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| 94 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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| 95 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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| 96 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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| 97 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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| 98 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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| 99 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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| 100 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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| 101 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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| 102 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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| 103 | 0x2d02ef8d
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| 104 | };
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| 105 |
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| 106 | public UInt32 crc32(UInt32 OldCRC,byte NewData)
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| 107 | {
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| 108 | return crc_32_tab[(OldCRC & 0xff) ^ NewData] ^ (OldCRC >> 8);
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| 109 | }
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| 110 |
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| 111 |
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| 112 | /// <summary>
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| 113 | /// LZF Compressor
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| 114 | /// </summary>
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| 115 |
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| 116 | UInt32 HLOG=14;
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| 117 | UInt32 HSIZE=(1<<14);
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| 118 |
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| 119 | /*
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| 120 | * don't play with this unless you benchmark!
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| 121 | * decompression is not dependent on the hash function
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| 122 | * the hashing function might seem strange, just believe me
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| 123 | * it works ;)
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| 124 | */
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| 125 | UInt32 MAX_LIT=(1 << 5);
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| 126 | UInt32 MAX_OFF=(1 << 13);
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| 127 | UInt32 MAX_REF=((1 << 8) + (1 << 3));
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| 128 |
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| 129 | UInt32 FRST(byte[] Array,UInt32 ptr)
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| 130 | {
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| 131 | return (UInt32)(((Array[ptr]) << 8) | Array[ptr+1]);
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| 132 | }
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| 133 |
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| 134 | UInt32 NEXT(UInt32 v,byte[] Array,UInt32 ptr)
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| 135 | {
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| 136 | return ((v) << 8) | Array[ptr+2];
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| 137 | }
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| 138 |
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| 139 | UInt32 IDX(UInt32 h)
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| 140 | {
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| 141 | return ((h ^ (h << 5)) >> (int)(((3*8 - HLOG)) - h*5) & (HSIZE - 1));
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| 142 | }
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| 143 |
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| 144 | /*
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| 145 | * compressed format
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| 146 | *
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| 147 | * 000LLLLL <L+1> ; literal
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| 148 | * LLLOOOOO oooooooo ; backref L
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| 149 | * 111OOOOO LLLLLLLL oooooooo ; backref L+7
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| 150 | *
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| 151 | */
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| 152 |
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| 153 | public int lzf_compress (byte[] in_data, int in_len,byte[] out_data, int out_len)
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| 154 | {
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| 155 | int c;
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| 156 | long []htab=new long[1<<14];
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| 157 | for (c=0;c<1<<14;c++)
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| 158 | {
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| 159 | htab[c]=0;
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| 160 | }
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| 161 |
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| 162 | long hslot;
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| 163 | UInt32 iidx = 0;
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| 164 | UInt32 oidx = 0;
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| 165 | //byte *in_end = ip + in_len;
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| 166 | //byte *out_end = op + out_len;
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| 167 | long reference;
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| 168 |
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| 169 | UInt32 hval = FRST (in_data,iidx);
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| 170 | long off;
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| 171 | int lit = 0;
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| 172 |
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| 173 | for (;;)
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| 174 | {
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| 175 | if (iidx < in_len - 2)
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| 176 | {
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| 177 | hval = NEXT (hval, in_data,iidx);
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| 178 | hslot = IDX (hval);
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| 179 | reference = htab[hslot];
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| 180 | htab[hslot] = (long)iidx;
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| 181 |
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| 182 | if ((off = iidx - reference - 1) < MAX_OFF
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| 183 | && iidx + 4 < in_len
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| 184 | && reference > 0
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| 185 | && in_data[reference+0] == in_data[iidx+0]
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| 186 | && in_data[reference+1] == in_data[iidx+1]
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| 187 | && in_data[reference+2] == in_data[iidx+2]
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| 188 | )
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| 189 | {
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| 190 | /* match found at *reference++ */
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| 191 | UInt32 len = 2;
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| 192 | UInt32 maxlen = (UInt32)in_len - iidx - len;
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| 193 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen;
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| 194 |
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| 195 | if (oidx + lit + 1 + 3 >= out_len)
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| 196 | return 0;
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| 197 |
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| 198 | do
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| 199 | len++;
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| 200 | while (len < maxlen && in_data[reference+len] == in_data[iidx+len]);
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| 201 |
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| 202 | if (lit!=0)
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| 203 | {
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| 204 | out_data[oidx++] = (byte)(lit - 1);
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| 205 | lit = -lit;
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| 206 | do
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| 207 | out_data[oidx++] = in_data[iidx+lit];
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| 208 | while ((++lit)!=0);
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| 209 | }
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| 210 |
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| 211 | len -= 2;
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| 212 | iidx++;
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| 213 |
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| 214 | if (len < 7)
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| 215 | {
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| 216 | out_data[oidx++] = (byte)((off >> 8) + (len << 5));
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| 217 | }
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| 218 | else
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| 219 | {
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| 220 | out_data[oidx++] = (byte)((off >> 8) + ( 7 << 5));
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| 221 | out_data[oidx++] = (byte)(len - 7);
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| 222 | }
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| 223 |
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| 224 | out_data[oidx++] = (byte)off;
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| 225 |
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| 226 | iidx += len-1;
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| 227 | hval = FRST (in_data,iidx);
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| 228 |
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| 229 | hval = NEXT (hval,in_data, iidx);
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| 230 | htab[IDX (hval)] = iidx;
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| 231 | iidx++;
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| 232 |
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| 233 | hval = NEXT (hval, in_data,iidx);
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| 234 | htab[IDX (hval)] = iidx;
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| 235 | iidx++;
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| 236 | continue;
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| 237 | }
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| 238 | }
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| 239 | else if (iidx == in_len)
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| 240 | break;
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| 241 |
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| 242 | /* one more literal byte we must copy */
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| 243 | lit++;
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| 244 | iidx++;
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| 245 |
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| 246 | if (lit == MAX_LIT)
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| 247 | {
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| 248 | if (oidx + 1 + MAX_LIT >= out_len)
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| 249 | return 0;
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| 250 |
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| 251 | out_data[oidx++] = (byte)(MAX_LIT - 1);
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| 252 | lit = -lit;
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| 253 | do
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| 254 | out_data[oidx++] = in_data[iidx+lit];
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| 255 | while ((++lit)!=0);
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| 256 | }
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| 257 | }
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| 258 |
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| 259 | if (lit!=0)
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| 260 | {
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| 261 | if (oidx + lit + 1 >= out_len)
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| 262 | return 0;
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| 263 |
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| 264 | out_data[oidx++] = (byte)(lit - 1);
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| 265 | lit = -lit;
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| 266 | do
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| 267 | out_data[oidx++] = in_data[iidx+lit];
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| 268 | while ((++lit)!=0);
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| 269 | }
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| 270 |
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| 271 | return (int)oidx;
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| 272 | }
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| 273 |
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| 274 | /// <summary>
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| 275 | /// LZF Decompressor
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| 276 | /// </summary>
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| 277 | public int lzf_decompress ( byte[] in_data, int in_len, byte[] out_data, int out_len)
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| 278 | {
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| 279 | UInt32 iidx=0;
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| 280 | UInt32 oidx=0;
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| 281 |
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| 282 | do
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| 283 | {
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| 284 | UInt32 ctrl = in_data[iidx++];
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| 285 |
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| 286 | if (ctrl < (1 << 5)) /* literal run */
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| 287 | {
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| 288 | ctrl++;
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| 289 |
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| 290 | if (oidx + ctrl > out_len)
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| 291 | {
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| 292 | //SET_ERRNO (E2BIG);
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| 293 | return 0;
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| 294 | }
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| 295 |
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| 296 | do
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| 297 | out_data[oidx++] = in_data[iidx++];
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| 298 | while ((--ctrl)!=0);
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| 299 | }
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| 300 | else /* back reference */
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| 301 | {
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| 302 | UInt32 len = ctrl >> 5;
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| 303 |
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| 304 | int reference = (int)(oidx - ((ctrl & 0x1f) << 8) - 1);
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| 305 |
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| 306 | if (len == 7)
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| 307 | len += in_data[iidx++];
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| 308 |
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| 309 | reference -= in_data[iidx++];
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| 310 |
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| 311 | if (oidx + len + 2 > out_len)
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| 312 | {
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| 313 | //SET_ERRNO (E2BIG);
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| 314 | return 0;
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| 315 | }
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| 316 |
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| 317 | if (reference < 0)
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| 318 | {
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| 319 | //SET_ERRNO (EINVAL);
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| 320 | return 0;
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| 321 | }
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| 322 |
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| 323 | out_data[oidx++]=out_data[reference++];
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| 324 | out_data[oidx++]=out_data[reference++];
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| 325 |
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| 326 | do
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| 327 | out_data[oidx++]=out_data[reference++];
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| 328 | while ((--len)!=0);
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| 329 | }
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| 330 | }
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| 331 | while (oidx < out_len && iidx < in_len);
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| 332 |
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| 333 | return (int)oidx;
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| 334 | }
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| 335 |
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| 336 | public CLZF()
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| 337 | {
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| 338 | //
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| 339 | // TODO: Add ructor logic here
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| 340 | //
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| 341 | }
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| 342 | }
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| 343 | }
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| 344 |
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