Commit | Line | Data |
---|---|---|
c627d613 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include "rsync.h" | |
21 | ||
34ccb63e AT |
22 | int csum_length=SUM_LENGTH; |
23 | ||
24 | #define CSUM_CHUNK 64 | |
25 | ||
aae43eb3 | 26 | int checksum_seed = 0; |
b98c7b81 | 27 | extern int remote_version; |
c627d613 AT |
28 | |
29 | /* | |
30 | a simple 32 bit checksum that can be upadted from either end | |
31 | (inspired by Mark Adler's Adler-32 checksum) | |
32 | */ | |
33 | uint32 get_checksum1(char *buf,int len) | |
34 | { | |
35 | int i; | |
36 | uint32 s1, s2; | |
37 | ||
38 | s1 = s2 = 0; | |
34ccb63e AT |
39 | for (i = 0; i < (len-4); i+=4) { |
40 | s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3]; | |
41 | s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3]); | |
42 | } | |
43 | for (; i < len; i++) { | |
44 | s1 += buf[i]; s2 += s1; | |
c627d613 AT |
45 | } |
46 | return (s1 & 0xffff) + (s2 << 16); | |
47 | } | |
48 | ||
49 | ||
34ccb63e AT |
50 | static void sum_put(MDstruct *md,char *sum) |
51 | { | |
52 | SIVAL(sum,0,md->buffer[0]); | |
53 | if (csum_length <= 4) return; | |
54 | SIVAL(sum,4,md->buffer[1]); | |
55 | if (csum_length <= 8) return; | |
56 | SIVAL(sum,8,md->buffer[2]); | |
57 | if (csum_length <= 12) return; | |
58 | SIVAL(sum,12,md->buffer[3]); | |
59 | } | |
60 | ||
61 | ||
c627d613 AT |
62 | void get_checksum2(char *buf,int len,char *sum) |
63 | { | |
c627d613 AT |
64 | int i; |
65 | MDstruct MD; | |
aae43eb3 AT |
66 | static char *buf1 = NULL; |
67 | static int len1 = 0; | |
68 | ||
69 | if (len > len1) { | |
70 | if (buf1) free(buf1); | |
57e877a1 | 71 | buf1 = (char *)malloc(len+4); |
aae43eb3 AT |
72 | len1 = len; |
73 | if (!buf1) out_of_memory("get_checksum2"); | |
74 | } | |
c627d613 AT |
75 | |
76 | MDbegin(&MD); | |
34ccb63e | 77 | |
aae43eb3 AT |
78 | bcopy(buf,buf1,len); |
79 | if (checksum_seed) { | |
57e877a1 AT |
80 | SIVAL(buf1,len,checksum_seed); |
81 | len += 4; | |
c627d613 | 82 | } |
34ccb63e | 83 | |
aae43eb3 AT |
84 | for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) { |
85 | MDupdate(&MD, buf1+i, CSUM_CHUNK*8); | |
86 | } | |
9e31c482 AT |
87 | if (len - i > 0) |
88 | MDupdate(&MD, buf1+i, (len-i)*8); | |
34ccb63e AT |
89 | |
90 | sum_put(&MD,sum); | |
c627d613 AT |
91 | } |
92 | ||
34ccb63e | 93 | |
c627d613 AT |
94 | void file_checksum(char *fname,char *sum,off_t size) |
95 | { | |
34ccb63e AT |
96 | int i; |
97 | MDstruct MD; | |
c6e7fcb4 | 98 | struct map_struct *buf; |
c627d613 | 99 | int fd; |
34ccb63e | 100 | int len = size; |
aae43eb3 | 101 | char tmpchunk[CSUM_CHUNK]; |
34ccb63e | 102 | |
43a481dc | 103 | bzero(sum,csum_length); |
c627d613 AT |
104 | |
105 | fd = open(fname,O_RDONLY); | |
106 | if (fd == -1) return; | |
107 | ||
108 | buf = map_file(fd,size); | |
34ccb63e AT |
109 | |
110 | MDbegin(&MD); | |
111 | ||
112 | for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) { | |
113 | bcopy(map_ptr(buf,i,CSUM_CHUNK),tmpchunk,CSUM_CHUNK); | |
114 | MDupdate(&MD, tmpchunk, CSUM_CHUNK*8); | |
c627d613 AT |
115 | } |
116 | ||
9e31c482 AT |
117 | if (len - i > 0) { |
118 | bcopy(map_ptr(buf,i,len-i),tmpchunk,len-i); | |
119 | MDupdate(&MD, tmpchunk, (len-i)*8); | |
120 | } | |
34ccb63e AT |
121 | |
122 | sum_put(&MD,sum); | |
123 | ||
c627d613 | 124 | close(fd); |
c6e7fcb4 | 125 | unmap_file(buf); |
c627d613 | 126 | } |
34ccb63e AT |
127 | |
128 | ||
129 | void checksum_init(void) | |
130 | { | |
b98c7b81 AT |
131 | if (remote_version >= 14) |
132 | csum_length = 2; /* adaptive */ | |
133 | else | |
134 | csum_length = SUM_LENGTH; | |
34ccb63e AT |
135 | } |
136 | ||
137 | ||
9e31c482 AT |
138 | |
139 | static MDstruct sumMD; | |
140 | static int sumresidue; | |
141 | static char sumrbuf[CSUM_CHUNK]; | |
142 | ||
143 | void sum_init(void) | |
144 | { | |
73545f2c AT |
145 | char s[4]; |
146 | MDbegin(&sumMD); | |
9e31c482 | 147 | sumresidue=0; |
73545f2c AT |
148 | SIVAL(s,0,checksum_seed); |
149 | sum_update(s,4); | |
9e31c482 AT |
150 | } |
151 | ||
152 | void sum_update(char *p,int len) | |
153 | { | |
154 | int i; | |
f94e821c AT |
155 | if (len + sumresidue < CSUM_CHUNK) { |
156 | bcopy(p,sumrbuf+sumresidue,len); | |
157 | sumresidue += len; | |
158 | return; | |
159 | } | |
160 | ||
9e31c482 AT |
161 | if (sumresidue) { |
162 | i = MIN(CSUM_CHUNK-sumresidue,len); | |
163 | bcopy(p,sumrbuf+sumresidue,i); | |
164 | MDupdate(&sumMD, sumrbuf, (i+sumresidue)*8); | |
165 | len -= i; | |
166 | p += i; | |
167 | } | |
168 | ||
169 | for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) { | |
170 | bcopy(p+i,sumrbuf,CSUM_CHUNK); | |
171 | MDupdate(&sumMD, sumrbuf, CSUM_CHUNK*8); | |
172 | } | |
173 | ||
174 | if (len - i > 0) { | |
175 | sumresidue = len-i; | |
176 | bcopy(p+i,sumrbuf,sumresidue); | |
177 | } else { | |
178 | sumresidue = 0; | |
179 | } | |
180 | } | |
181 | ||
182 | void sum_end(char *sum) | |
183 | { | |
184 | if (sumresidue) | |
185 | MDupdate(&sumMD, sumrbuf, sumresidue*8); | |
186 | ||
187 | SIVAL(sum,0,sumMD.buffer[0]); | |
188 | SIVAL(sum,4,sumMD.buffer[1]); | |
189 | SIVAL(sum,8,sumMD.buffer[2]); | |
190 | SIVAL(sum,12,sumMD.buffer[3]); | |
191 | } | |
192 | ||
193 |