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Diffstat (limited to 'cs/CLZF.cs')
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diff --git a/cs/CLZF.cs b/cs/CLZF.cs new file mode 100644 index 0000000..81b93bf --- /dev/null +++ b/cs/CLZF.cs @@ -0,0 +1,344 @@ +/* + * Copyright (c) 2005 Oren J. Maurice <oymaurice@hazorea.org.il> + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License version 2 (the "GPL"), in which case the + * provisions of the GPL are applicable instead of the above. If you wish to + * allow the use of your version of this file only under the terms of the + * GPL and not to allow others to use your version of this file under the + * BSD license, indicate your decision by deleting the provisions above and + * replace them with the notice and other provisions required by the GPL. If + * you do not delete the provisions above, a recipient may use your version + * of this file under either the BSD or the GPL. + */ + +using System; + +namespace LZF.NET +{ + + /// <summary> + /// Summary description for CLZF. + /// </summary> + public class CLZF + { + // CRC32 data & function + UInt32 []crc_32_tab = new UInt32[256] + { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, + 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, + 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, + 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, + 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, + 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, + 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, + 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, + 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, + 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, + 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, + 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, + 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, + 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, + 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, + 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, + 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, + 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, + 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, + 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, + 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, + 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, + 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, + 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, + 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, + 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, + 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, + 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, + 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, + 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, + 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, + 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, + 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, + 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, + 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, + 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, + 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, + 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, + 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, + 0x2d02ef8d + }; + + public UInt32 crc32(UInt32 OldCRC,byte NewData) + { + return crc_32_tab[(OldCRC & 0xff) ^ NewData] ^ (OldCRC >> 8); + } + + + /// <summary> + /// LZF Compressor + /// </summary> + + UInt32 HLOG=14; + UInt32 HSIZE=(1<<14); + + /* + * don't play with this unless you benchmark! + * decompression is not dependent on the hash function + * the hashing function might seem strange, just believe me + * it works ;) + */ + UInt32 MAX_LIT=(1 << 5); + UInt32 MAX_OFF=(1 << 13); + UInt32 MAX_REF=((1 << 8) + (1 << 3)); + + UInt32 FRST(byte[] Array,UInt32 ptr) + { + return (UInt32)(((Array[ptr]) << 8) | Array[ptr+1]); + } + + UInt32 NEXT(UInt32 v,byte[] Array,UInt32 ptr) + { + return ((v) << 8) | Array[ptr+2]; + } + + UInt32 IDX(UInt32 h) + { + return ((h ^ (h << 5)) >> (int)(((3*8 - HLOG)) - h*5) & (HSIZE - 1)); + } + + /* + * compressed format + * + * 000LLLLL <L+1> ; literal + * LLLOOOOO oooooooo ; backref L + * 111OOOOO LLLLLLLL oooooooo ; backref L+7 + * + */ + + public int lzf_compress (byte[] in_data, int in_len,byte[] out_data, int out_len) + { + int c; + long []htab=new long[1<<14]; + for (c=0;c<1<<14;c++) + { + htab[c]=0; + } + + long hslot; + UInt32 iidx = 0; + UInt32 oidx = 0; + //byte *in_end = ip + in_len; + //byte *out_end = op + out_len; + long reference; + + UInt32 hval = FRST (in_data,iidx); + long off; + int lit = 0; + + for (;;) + { + if (iidx < in_len - 2) + { + hval = NEXT (hval, in_data,iidx); + hslot = IDX (hval); + reference = htab[hslot]; + htab[hslot] = (long)iidx; + + if ((off = iidx - reference - 1) < MAX_OFF + && iidx + 4 < in_len + && reference > 0 + && in_data[reference+0] == in_data[iidx+0] + && in_data[reference+1] == in_data[iidx+1] + && in_data[reference+2] == in_data[iidx+2] + ) + { + /* match found at *reference++ */ + UInt32 len = 2; + UInt32 maxlen = (UInt32)in_len - iidx - len; + maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; + + if (oidx + lit + 1 + 3 >= out_len) + return 0; + + do + len++; + while (len < maxlen && in_data[reference+len] == in_data[iidx+len]); + + if (lit!=0) + { + out_data[oidx++] = (byte)(lit - 1); + lit = -lit; + do + out_data[oidx++] = in_data[iidx+lit]; + while ((++lit)!=0); + } + + len -= 2; + iidx++; + + if (len < 7) + { + out_data[oidx++] = (byte)((off >> 8) + (len << 5)); + } + else + { + out_data[oidx++] = (byte)((off >> 8) + ( 7 << 5)); + out_data[oidx++] = (byte)(len - 7); + } + + out_data[oidx++] = (byte)off; + + iidx += len-1; + hval = FRST (in_data,iidx); + + hval = NEXT (hval,in_data, iidx); + htab[IDX (hval)] = iidx; + iidx++; + + hval = NEXT (hval, in_data,iidx); + htab[IDX (hval)] = iidx; + iidx++; + continue; + } + } + else if (iidx == in_len) + break; + + /* one more literal byte we must copy */ + lit++; + iidx++; + + if (lit == MAX_LIT) + { + if (oidx + 1 + MAX_LIT >= out_len) + return 0; + + out_data[oidx++] = (byte)(MAX_LIT - 1); + lit = -lit; + do + out_data[oidx++] = in_data[iidx+lit]; + while ((++lit)!=0); + } + } + + if (lit!=0) + { + if (oidx + lit + 1 >= out_len) + return 0; + + out_data[oidx++] = (byte)(lit - 1); + lit = -lit; + do + out_data[oidx++] = in_data[iidx+lit]; + while ((++lit)!=0); + } + + return (int)oidx; + } + + /// <summary> + /// LZF Decompressor + /// </summary> + public int lzf_decompress ( byte[] in_data, int in_len, byte[] out_data, int out_len) + { + UInt32 iidx=0; + UInt32 oidx=0; + + do + { + UInt32 ctrl = in_data[iidx++]; + + if (ctrl < (1 << 5)) /* literal run */ + { + ctrl++; + + if (oidx + ctrl > out_len) + { + //SET_ERRNO (E2BIG); + return 0; + } + + do + out_data[oidx++] = in_data[iidx++]; + while ((--ctrl)!=0); + } + else /* back reference */ + { + UInt32 len = ctrl >> 5; + + int reference = (int)(oidx - ((ctrl & 0x1f) << 8) - 1); + + if (len == 7) + len += in_data[iidx++]; + + reference -= in_data[iidx++]; + + if (oidx + len + 2 > out_len) + { + //SET_ERRNO (E2BIG); + return 0; + } + + if (reference < 0) + { + //SET_ERRNO (EINVAL); + return 0; + } + + out_data[oidx++]=out_data[reference++]; + out_data[oidx++]=out_data[reference++]; + + do + out_data[oidx++]=out_data[reference++]; + while ((--len)!=0); + } + } + while (oidx < out_len && iidx < in_len); + + return (int)oidx; + } + + public CLZF() + { + // + // TODO: Add ructor logic here + // + } + } +} + |