Mercurial > 510Connectbot
annotate src/com/jcraft/jzlib/Adler32.java @ 361:395a16681ae1
add help files to the web documentation
author | Carl Byington <carl@five-ten-sg.com> |
---|---|
date | Mon, 04 Aug 2014 08:23:36 -0700 |
parents | 46c2115ae1c8 |
children |
rev | line source |
---|---|
0 | 1 /* -*-mode:java; c-basic-offset:2; -*- */ |
2 /* | |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
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 | |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
11 2. Redistributions in binary form must reproduce the above copyright |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
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 | |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
37 final public class Adler32 implements Checksum { |
0 | 38 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
39 // largest prime smaller than 65536 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
40 static final private int BASE=65521; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
41 // NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
42 static final private int NMAX=5552; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
43 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
44 private long s1=1L; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
45 private long s2=0L; |
0 | 46 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
47 public void reset(long init){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
48 s1=init&0xffff; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
49 s2=(init>>16)&0xffff; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
50 } |
0 | 51 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
52 public void reset(){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
53 s1=1L; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
54 s2=0L; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
55 } |
0 | 56 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
57 public long getValue(){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
58 return ((s2<<16)|s1); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
59 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
60 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
61 public void update(byte[] buf, int index, int len){ |
0 | 62 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
63 if(len==1){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
64 s1+=buf[index++]&0xff; s2+=s1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
65 s1%=BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
66 s2%=BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
67 return; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
68 } |
0 | 69 |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
70 int len1 = len/NMAX; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
71 int len2 = len%NMAX; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
72 while(len1-->0) { |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
73 int k=NMAX; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
74 len-=k; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
75 while(k-->0){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
76 s1+=buf[index++]&0xff; s2+=s1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
77 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
78 s1%=BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
79 s2%=BASE; |
0 | 80 } |
81 | |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
82 int k=len2; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
83 len-=k; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
84 while(k-->0){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
85 s1+=buf[index++]&0xff; s2+=s1; |
0 | 86 } |
357
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
87 s1%=BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
88 s2%=BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
89 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
90 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
91 public Adler32 copy(){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
92 Adler32 foo = new Adler32(); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
93 foo.s1 = this.s1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
94 foo.s2 = this.s2; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
95 return foo; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
96 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
97 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
98 // The following logic has come from zlib.1.2. |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
99 static long combine(long adler1, long adler2, long len2){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
100 long BASEL = (long)BASE; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
101 long sum1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
102 long sum2; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
103 long rem; // unsigned int |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
104 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
105 rem = len2 % BASEL; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
106 sum1 = adler1 & 0xffffL; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
107 sum2 = rem * sum1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
108 sum2 %= BASEL; // MOD(sum2); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
109 sum1 += (adler2 & 0xffffL) + BASEL - 1; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
110 sum2 += ((adler1 >> 16) & 0xffffL) + ((adler2 >> 16) & 0xffffL) + BASEL - rem; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
111 if (sum1 >= BASEL) sum1 -= BASEL; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
112 if (sum1 >= BASEL) sum1 -= BASEL; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
113 if (sum2 >= (BASEL << 1)) sum2 -= (BASEL << 1); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
114 if (sum2 >= BASEL) sum2 -= BASEL; |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
115 return sum1 | (sum2 << 16); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
116 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
117 |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
118 /* |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
119 private java.util.zip.Adler32 adler=new java.util.zip.Adler32(); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
120 public void update(byte[] buf, int index, int len){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
121 if(buf==null) {adler.reset();} |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
122 else{adler.update(buf, index, len);} |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
123 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
124 public void reset(){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
125 adler.reset(); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
126 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
127 public void reset(long init){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
128 if(init==1L){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
129 adler.reset(); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
130 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
131 else{ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
132 System.err.println("unsupported operation"); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
133 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
134 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
135 public long getValue(){ |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
136 return adler.getValue(); |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
137 } |
46c2115ae1c8
update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
Carl Byington <carl@five-ten-sg.com>
parents:
0
diff
changeset
|
138 */ |
0 | 139 } |