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annotate src/com/jcraft/jzlib/Adler32.java @ 435:9c6a269fabb5 stable-1.9.2

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author Carl Byington <carl@five-ten-sg.com>
date Thu, 09 Apr 2015 11:32:38 -0700
parents 46c2115ae1c8
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1 /* -*-mode:java; c-basic-offset:2; -*- */
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2 /*
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3 Copyright (c) 2000-2011 ymnk, JCraft,Inc. All rights reserved.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are met:
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7
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8 1. Redistributions of source code must retain the above copyright notice,
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9 this list of conditions and the following disclaimer.
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10
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11 2. Redistributions in binary form must reproduce the above copyright
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12 notice, this list of conditions and the following disclaimer in
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13 the documentation and/or other materials provided with the distribution.
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14
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15 3. The names of the authors may not be used to endorse or promote products
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16 derived from this software without specific prior written permission.
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17
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18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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21 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28 */
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29 /*
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30 * This program is based on zlib-1.1.3, so all credit should go authors
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31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
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32 * and contributors of zlib.
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33 */
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34
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35 package com.jcraft.jzlib;
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36
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37 final public class Adler32 implements Checksum {
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38
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39 // largest prime smaller than 65536
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40 static final private int BASE=65521;
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41 // NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1
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42 static final private int NMAX=5552;
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43
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44 private long s1=1L;
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45 private long s2=0L;
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46
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47 public void reset(long init){
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48 s1=init&0xffff;
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49 s2=(init>>16)&0xffff;
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50 }
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51
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52 public void reset(){
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53 s1=1L;
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54 s2=0L;
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55 }
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56
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57 public long getValue(){
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58 return ((s2<<16)|s1);
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59 }
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60
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61 public void update(byte[] buf, int index, int len){
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62
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63 if(len==1){
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64 s1+=buf[index++]&0xff; s2+=s1;
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65 s1%=BASE;
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66 s2%=BASE;
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67 return;
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68 }
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69
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70 int len1 = len/NMAX;
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71 int len2 = len%NMAX;
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72 while(len1-->0) {
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73 int k=NMAX;
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74 len-=k;
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75 while(k-->0){
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76 s1+=buf[index++]&0xff; s2+=s1;
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77 }
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78 s1%=BASE;
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79 s2%=BASE;
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80 }
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81
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82 int k=len2;
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83 len-=k;
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84 while(k-->0){
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85 s1+=buf[index++]&0xff; s2+=s1;
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86 }
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87 s1%=BASE;
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88 s2%=BASE;
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89 }
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90
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91 public Adler32 copy(){
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92 Adler32 foo = new Adler32();
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93 foo.s1 = this.s1;
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94 foo.s2 = this.s2;
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95 return foo;
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96 }
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97
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98 // The following logic has come from zlib.1.2.
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99 static long combine(long adler1, long adler2, long len2){
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100 long BASEL = (long)BASE;
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101 long sum1;
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102 long sum2;
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103 long rem; // unsigned int
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104
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105 rem = len2 % BASEL;
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106 sum1 = adler1 & 0xffffL;
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107 sum2 = rem * sum1;
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108 sum2 %= BASEL; // MOD(sum2);
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109 sum1 += (adler2 & 0xffffL) + BASEL - 1;
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110 sum2 += ((adler1 >> 16) & 0xffffL) + ((adler2 >> 16) & 0xffffL) + BASEL - rem;
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111 if (sum1 >= BASEL) sum1 -= BASEL;
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112 if (sum1 >= BASEL) sum1 -= BASEL;
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113 if (sum2 >= (BASEL << 1)) sum2 -= (BASEL << 1);
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114 if (sum2 >= BASEL) sum2 -= BASEL;
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115 return sum1 | (sum2 << 16);
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116 }
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117
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118 /*
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119 private java.util.zip.Adler32 adler=new java.util.zip.Adler32();
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120 public void update(byte[] buf, int index, int len){
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121 if(buf==null) {adler.reset();}
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122 else{adler.update(buf, index, len);}
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123 }
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124 public void reset(){
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125 adler.reset();
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126 }
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127 public void reset(long init){
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128 if(init==1L){
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129 adler.reset();
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130 }
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131 else{
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132 System.err.println("unsupported operation");
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133 }
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134 }
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135 public long getValue(){
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136 return adler.getValue();
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137 }
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138 */
0
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139 }