1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Marcus Boerger <helly@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id: 72ecea30ff644d09080ef2da8b617a4ebdb89c8d $ */
20
21 /* incorporated from D.J.Bernstein's cdb-0.75 (http://cr.yp.to/cdb.html)*/
22
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include "php.h"
28
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #ifndef PHP_WIN32
32 #include <sys/mman.h>
33 #endif
34 #ifdef HAVE_UNISTD_H
35 #include <unistd.h>
36 #endif
37 #include <string.h>
38 #include <errno.h>
39 #include "cdb.h"
40
41 #ifndef EPROTO
42 # define EPROTO -15 /* cdb 0.75's default for PROTOless systems */
43 #endif
44
45 /* {{{ cdb_match */
46 static int cdb_match(struct cdb *c, char *key, unsigned int len, uint32 pos)
47 {
48 char buf[32];
49 unsigned int n;
50
51 while (len > 0) {
52 n = sizeof(buf);
53 if (n > len)
54 n = len;
55 if (cdb_read(c, buf, n, pos) == -1)
56 return -1;
57 if (memcmp(buf, key, n))
58 return 0;
59 pos += n;
60 key += n;
61 len -= n;
62 }
63 return 1;
64 }
65 /* }}} */
66
67 /* {{{ cdb_hash */
68 uint32 cdb_hash(char *buf, unsigned int len)
69 {
70 uint32 h;
71 const unsigned char * b = (unsigned char *)buf;
72
73 h = CDB_HASHSTART;
74 while (len--) {
75 h = ( h + (h << 5)) ^ (*b++);
76 }
77 return h;
78 }
79 /* }}} */
80
81 /* {{{ cdb_free */
82 void cdb_free(struct cdb *c)
83 {
84 }
85 /* }}} */
86
87 /* {{{ cdb_findstart */
88 void cdb_findstart(struct cdb *c)
89 {
90 c->loop = 0;
91 }
92 /* }}} */
93
94 /* {{{ cdb_init */
95 void cdb_init(struct cdb *c, php_stream *fp)
96 {
97 cdb_free(c);
98 cdb_findstart(c);
99 c->fp = fp;
100 }
101 /* }}} */
102
103 /* {{{ cdb_read */
104 int cdb_read(struct cdb *c, char *buf, unsigned int len, uint32 pos)
105 {
106 if (php_stream_seek(c->fp, pos, SEEK_SET) == -1) {
107 errno = EPROTO;
108 return -1;
109 }
110 while (len > 0) {
111 int r;
112 do {
113 r = php_stream_read(c->fp, buf, len);
114 } while ((r == -1) && (errno == EINTR));
115 if (r == -1)
116 return -1;
117 if (r == 0) {
118 errno = EPROTO;
119 return -1;
120 }
121 buf += r;
122 len -= r;
123 }
124 return 0;
125 }
126 /* }}} */
127
128 /* {{{ cdb_findnext */
129 int cdb_findnext(struct cdb *c, char *key, unsigned int len)
130 {
131 char buf[8];
132 uint32 pos;
133 uint32 u;
134
135 if (!c->loop) {
136 u = cdb_hash(key, len);
137 if (cdb_read(c, buf, 8, (u << 3) & 2047) == -1)
138 return -1;
139 uint32_unpack(buf + 4,&c->hslots);
140 if (!c->hslots)
141 return 0;
142 uint32_unpack(buf, &c->hpos);
143 c->khash = u;
144 u >>= 8;
145 u %= c->hslots;
146 u <<= 3;
147 c->kpos = c->hpos + u;
148 }
149
150 while (c->loop < c->hslots) {
151 if (cdb_read(c, buf, 8, c->kpos) == -1)
152 return -1;
153 uint32_unpack(buf + 4, &pos);
154 if (!pos)
155 return 0;
156 c->loop += 1;
157 c->kpos += 8;
158 if (c->kpos == c->hpos + (c->hslots << 3))
159 c->kpos = c->hpos;
160 uint32_unpack(buf, &u);
161 if (u == c->khash) {
162 if (cdb_read(c, buf, 8, pos) == -1)
163 return -1;
164 uint32_unpack(buf, &u);
165 if (u == len)
166 switch(cdb_match(c, key, len, pos + 8)) {
167 case -1:
168 return -1;
169 case 1:
170 uint32_unpack(buf + 4, &c->dlen);
171 c->dpos = pos + 8 + len;
172 return 1;
173 }
174 }
175 }
176
177 return 0;
178 }
179 /* }}} */
180
181 /* {{{ cdb_find */
182 int cdb_find(struct cdb *c, char *key, unsigned int len)
183 {
184 cdb_findstart(c);
185 return cdb_findnext(c, key, len);
186 }
187 /* }}} */
188
189 /* {{{ cdb_version */
190 char *cdb_version()
191 {
192 return "0.75, $Id: 72ecea30ff644d09080ef2da8b617a4ebdb89c8d $";
193 }
194 /* }}} */