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annotate Checksums/CRC32.cs @ 4:7516b6315819

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* Fix tooling version - we're 2.0 compatible, not 3.5 no-open-ticket
author IBBoard <dev@ibboard.co.uk>
date Wed, 26 Jan 2011 20:04:48 +0000
parents 94e25b786321
children
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1
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1 // CRC32.cs - Computes CRC32 data checksum of a data stream
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2 // Copyright (C) 2001 Mike Krueger
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3 //
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4 // This file was translated from java, it was part of the GNU Classpath
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5 // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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6 //
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7 // This program is free software; you can redistribute it and/or
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8 // modify it under the terms of the GNU General Public License
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9 // as published by the Free Software Foundation; either version 2
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10 // of the License, or (at your option) any later version.
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11 //
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12 // This program is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16 //
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17 // You should have received a copy of the GNU General Public License
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18 // along with this program; if not, write to the Free Software
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19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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20 //
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21 // Linking this library statically or dynamically with other modules is
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22 // making a combined work based on this library. Thus, the terms and
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23 // conditions of the GNU General Public License cover the whole
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24 // combination.
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25 //
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26 // As a special exception, the copyright holders of this library give you
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27 // permission to link this library with independent modules to produce an
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28 // executable, regardless of the license terms of these independent
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29 // modules, and to copy and distribute the resulting executable under
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30 // terms of your choice, provided that you also meet, for each linked
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31 // independent module, the terms and conditions of the license of that
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32 // module. An independent module is a module which is not derived from
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33 // or based on this library. If you modify this library, you may extend
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34 // this exception to your version of the library, but you are not
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35 // obligated to do so. If you do not wish to do so, delete this
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36 // exception statement from your version.
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37
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38 using System;
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39
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40 namespace ICSharpCode.SharpZipLib.Checksums
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41 {
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42
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43 /// <summary>
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44 /// Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
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45 /// x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
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46 ///
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47 /// Polynomials over GF(2) are represented in binary, one bit per coefficient,
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48 /// with the lowest powers in the most significant bit. Then adding polynomials
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49 /// is just exclusive-or, and multiplying a polynomial by x is a right shift by
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50 /// one. If we call the above polynomial p, and represent a byte as the
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51 /// polynomial q, also with the lowest power in the most significant bit (so the
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52 /// byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
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53 /// where a mod b means the remainder after dividing a by b.
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54 ///
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55 /// This calculation is done using the shift-register method of multiplying and
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56 /// taking the remainder. The register is initialized to zero, and for each
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57 /// incoming bit, x^32 is added mod p to the register if the bit is a one (where
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58 /// x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
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59 /// x (which is shifting right by one and adding x^32 mod p if the bit shifted
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60 /// out is a one). We start with the highest power (least significant bit) of
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61 /// q and repeat for all eight bits of q.
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62 ///
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63 /// The table is simply the CRC of all possible eight bit values. This is all
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64 /// the information needed to generate CRC's on data a byte at a time for all
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65 /// combinations of CRC register values and incoming bytes.
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66 /// </summary>
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67 public sealed class Crc32 : IChecksum
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68 {
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69 const uint CrcSeed = 0xFFFFFFFF;
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70
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71 readonly static uint[] CrcTable = new uint[] {
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72 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419,
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73 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4,
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74 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07,
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75 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
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76 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856,
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77 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
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78 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4,
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79 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
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80 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
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81 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A,
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82 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599,
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83 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
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84 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190,
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85 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F,
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86 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E,
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87 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
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88 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED,
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89 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
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90 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3,
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91 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
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92 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A,
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93 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5,
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94 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010,
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95 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
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96 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17,
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97 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6,
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98 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
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99 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
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100 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344,
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101 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
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102 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A,
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103 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
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104 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1,
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105 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C,
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106 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
107 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
108 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
109 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
110 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
111 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
112 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
113 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
114 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
115 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
116 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
117 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
118 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
119 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
120 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
121 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
122 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
123 0x2D02EF8D
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
124 };
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
125
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
126 internal static uint ComputeCrc32(uint oldCrc, byte value)
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
127 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
128 return (uint)(Crc32.CrcTable[(oldCrc ^ value) & 0xFF] ^ (oldCrc >> 8));
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
129 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
130
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
131 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
132 /// The crc data checksum so far.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
133 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
134 uint crc;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
135
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
136 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
137 /// Returns the CRC32 data checksum computed so far.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
138 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
139 public long Value {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
140 get {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
141 return (long)crc;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
142 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
143 set {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
144 crc = (uint)value;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
145 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
146 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
147
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
148 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
149 /// Resets the CRC32 data checksum as if no update was ever called.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
150 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
151 public void Reset()
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
152 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
153 crc = 0;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
154 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
155
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
156 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
157 /// Updates the checksum with the int bval.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
158 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
159 /// <param name = "value">
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
160 /// the byte is taken as the lower 8 bits of value
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
161 /// </param>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
162 public void Update(int value)
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
163 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
164 crc ^= CrcSeed;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
165 crc = CrcTable[(crc ^ value) & 0xFF] ^ (crc >> 8);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
166 crc ^= CrcSeed;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
167 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
168
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
169 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
170 /// Updates the checksum with the bytes taken from the array.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
171 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
172 /// <param name="buffer">
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
173 /// buffer an array of bytes
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
174 /// </param>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
175 public void Update(byte[] buffer)
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
176 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
177 if (buffer == null) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
178 throw new ArgumentNullException("buffer");
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
179 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
180
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
181 Update(buffer, 0, buffer.Length);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
182 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
183
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
184 /// <summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
185 /// Adds the byte array to the data checksum.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
186 /// </summary>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
187 /// <param name = "buffer">
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
188 /// The buffer which contains the data
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
189 /// </param>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
190 /// <param name = "offset">
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
191 /// The offset in the buffer where the data starts
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
192 /// </param>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
193 /// <param name = "count">
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
194 /// The number of data bytes to update the CRC with.
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
195 /// </param>
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
196 public void Update(byte[] buffer, int offset, int count)
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
197 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
198 if (buffer == null) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
199 throw new ArgumentNullException("buffer");
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
200 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
201
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
202 if ( count < 0 ) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
203 #if NETCF_1_0
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
204 throw new ArgumentOutOfRangeException("count");
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
205 #else
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
206 throw new ArgumentOutOfRangeException("count", "Count cannot be less than zero");
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
207 #endif
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
208 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
209
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
210 if (offset < 0 || offset + count > buffer.Length) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
211 throw new ArgumentOutOfRangeException("offset");
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
212 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
213
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
214 crc ^= CrcSeed;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
215
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
216 while (--count >= 0) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
217 crc = CrcTable[(crc ^ buffer[offset++]) & 0xFF] ^ (crc >> 8);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
218 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
219
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
220 crc ^= CrcSeed;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
221 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
222 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
223 }