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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> |
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date | Thu, 09 Apr 2015 11:32:38 -0700 |
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0 | 1 /* -*-mode:java; c-basic-offset:2; -*- */ |
2 /* | |
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3 Copyright (c) 2000-2011 ymnk, JCraft,Inc. All rights reserved. |
0 | 4 |
5 Redistribution and use in source and binary forms, with or without | |
6 modification, are permitted provided that the following conditions are met: | |
7 | |
8 1. Redistributions of source code must retain the above copyright notice, | |
9 this list of conditions and the following disclaimer. | |
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 |
0 | 13 the documentation and/or other materials provided with the distribution. |
14 | |
15 3. The names of the authors may not be used to endorse or promote products | |
16 derived from this software without specific prior written permission. | |
17 | |
18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, | |
19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT, | |
21 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, | |
24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 */ | |
29 /* | |
30 * This program is based on zlib-1.1.3, so all credit should go authors | |
31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu) | |
32 * and contributors of zlib. | |
33 */ | |
34 | |
35 package com.jcraft.jzlib; | |
36 | |
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37 final public class Adler32 implements Checksum { |
0 | 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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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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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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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){ |
0 | 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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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; |
0 | 80 } |
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; |
0 | 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 | 139 } |