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annotate cdb.c @ 6:fb33dc49cd48

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author Henry S. Thompson <ht@inf.ed.ac.uk>
date Wed, 29 Jan 2025 12:43:39 +0000
parents 41b9b6a160d1
children 0e21568dec72
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rev   line source
0
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
1 /* Public domain. */
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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2
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3 #include <sys/types.h>
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4 #include <sys/stat.h>
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parents:
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5 #include <sys/mman.h>
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6 #include "readwrite.h"
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parents:
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7 #include "error.h"
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8 #include "seek.h"
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parents:
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9 #include "byte.h"
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parents:
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10 #include "cdb.h"
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11
1
41b9b6a160d1 access functions,
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12
41b9b6a160d1 access functions,
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13 static Cdb c;
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14
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15 Cdb* cdb_new(void)
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16 {
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17 return &c;
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18 }
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19
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20 void cdb_free(Cdb *c)
0
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21 {
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
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22 if (c->map) {
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Henry S. Thompson <ht@inf.ed.ac.uk>
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23 munmap(c->map,c->size);
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24 c->map = 0;
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25 }
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Henry S. Thompson <ht@inf.ed.ac.uk>
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26 }
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27
1
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28 uint32 cdb_len() {
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29 return c.dlen;
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30 }
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31
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32 uint32 cdb_pos() {
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33 return c.dpos;
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34 }
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35
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36 char *cdb_mmap() {
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37 return c.map;
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38 }
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39
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40 uint32 cdb_msize() {
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41 return c.size;
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42 }
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43
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44 void cdb_findstart(Cdb *c)
0
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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45 {
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46 c->loop = 0;
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47 }
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48
1
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49 void cdb_init(Cdb *c,int fd)
0
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50 {
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51 struct stat st;
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52 char *x;
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53
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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54 cdb_free(c);
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parents:
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55 cdb_findstart(c);
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Henry S. Thompson <ht@inf.ed.ac.uk>
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56 c->fd = fd;
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57
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Henry S. Thompson <ht@inf.ed.ac.uk>
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58 if (fstat(fd,&st) == 0)
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parents:
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59 if (st.st_size <= 0xffffffff) {
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parents:
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60 x = mmap(0,st.st_size,PROT_READ,MAP_SHARED,fd,0);
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parents:
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61 if (x + 1) {
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62 c->size = st.st_size;
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63 c->map = x;
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64 }
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65 }
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66 }
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67
1
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68 int cdb_read(Cdb *c,char *buf,unsigned int len,uint32 pos)
0
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69 {
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70 if (c->map) {
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71 if ((pos > c->size) || (c->size - pos < len)) goto FORMAT;
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parents:
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72 byte_copy(buf,len,c->map + pos);
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parents:
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73 }
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74 else {
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parents:
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75 if (seek_set(c->fd,pos) == -1) return -1;
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parents:
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76 while (len > 0) {
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77 int r;
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parents:
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78 do
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79 r = read(c->fd,buf,len);
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parents:
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80 while ((r == -1) && (errno == error_intr));
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parents:
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81 if (r == -1) return -1;
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parents:
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82 if (r == 0) goto FORMAT;
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parents:
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83 buf += r;
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parents:
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84 len -= r;
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parents:
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85 }
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86 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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parents:
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87 return 0;
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88
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89 FORMAT:
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parents:
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90 errno = error_proto;
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parents:
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91 return -1;
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parents:
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92 }
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parents:
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93
1
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94 static int match(Cdb *c,char *key,unsigned int len,uint32 pos)
0
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parents:
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95 {
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96 char buf[32];
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97 int n;
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98
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parents:
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99 while (len > 0) {
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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100 n = sizeof buf;
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parents:
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101 if (n > len) n = len;
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parents:
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102 if (cdb_read(c,buf,n,pos) == -1) return -1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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parents:
diff changeset
103 if (byte_diff(buf,n,key)) return 0;
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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104 pos += n;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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105 key += n;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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106 len -= n;
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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107 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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parents:
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108 return 1;
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parents:
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109 }
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parents:
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110
1
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parents: 0
diff changeset
111 int cdb_findnext(Cdb *c,char *key,unsigned int len)
0
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112 {
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113 char buf[8];
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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114 uint32 pos;
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parents:
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115 uint32 u;
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116
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parents:
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117 if (!c->loop) {
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118 u = cdb_hash(key,len);
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parents:
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119 if (cdb_read(c,buf,8,(u << 3) & 2047) == -1) return -1;
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parents:
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120 uint32_unpack(buf + 4,&c->hslots);
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parents:
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121 if (!c->hslots) return 0;
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parents:
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122 uint32_unpack(buf,&c->hpos);
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parents:
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123 c->khash = u;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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parents:
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124 u >>= 8;
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parents:
diff changeset
125 u %= c->hslots;
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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126 u <<= 3;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
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parents:
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127 c->kpos = c->hpos + u;
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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128 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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129
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Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
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130 while (c->loop < c->hslots) {
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
131 if (cdb_read(c,buf,8,c->kpos) == -1) return -1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
132 uint32_unpack(buf + 4,&pos);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
133 if (!pos) return 0;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
134 c->loop += 1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
135 c->kpos += 8;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
136 if (c->kpos == c->hpos + (c->hslots << 3)) c->kpos = c->hpos;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
137 uint32_unpack(buf,&u);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
138 if (u == c->khash) {
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
139 if (cdb_read(c,buf,8,pos) == -1) return -1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
140 uint32_unpack(buf,&u);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
141 if (u == len)
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
142 switch(match(c,key,len,pos + 8)) {
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
143 case -1:
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
144 return -1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
145 case 1:
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
146 uint32_unpack(buf + 4,&c->dlen);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
147 c->dpos = pos + 8 + len;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
148 return 1;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
149 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
150 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
151 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
152
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
153 return 0;
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
154 }
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
155
1
41b9b6a160d1 access functions,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents: 0
diff changeset
156 int cdb_find(Cdb *c,char *key,unsigned int len)
0
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
157 {
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
158 cdb_findstart(c);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
159 return cdb_findnext(c,key,len);
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
160 }