95 lines
1.7 KiB
C
95 lines
1.7 KiB
C
#include <sys/types.h>
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#include <errno.h>
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extern int errno;
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#include "cdb.h"
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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int cdb_bread(fd,buf,len)
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int fd;
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char *buf;
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int len;
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{
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int r;
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while (len > 0) {
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do
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r = read(fd,buf,len);
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while ((r == -1) && (errno == EINTR));
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if (r == -1) return -1;
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if (r == 0) { errno = EIO; return -1; }
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buf += r;
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len -= r;
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}
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return 0;
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}
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static int match(fd,key,len)
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int fd;
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char *key;
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unsigned int len;
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{
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char buf[32];
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int n;
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int i;
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while (len > 0) {
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n = sizeof(buf);
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if (n > len) n = len;
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if (cdb_bread(fd,buf,n) == -1) return -1;
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for (i = 0;i < n;++i) if (buf[i] != key[i]) return 0;
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key += n;
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len -= n;
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}
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return 1;
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}
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int cdb_seek(fd,key,len,dlen)
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int fd;
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char *key;
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unsigned int len;
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uint32 *dlen;
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{
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char packbuf[8];
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uint32 pos;
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uint32 h;
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uint32 lenhash;
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uint32 h2;
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uint32 loop;
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uint32 poskd;
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h = cdb_hash(key,len);
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pos = 8 * (h & 255);
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if (lseek(fd,(off_t) pos,SEEK_SET) == -1) return -1;
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if (cdb_bread(fd,packbuf,8) == -1) return -1;
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pos = cdb_unpack(packbuf);
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lenhash = cdb_unpack(packbuf + 4);
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if (!lenhash) return 0;
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h2 = (h >> 8) % lenhash;
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for (loop = 0;loop < lenhash;++loop) {
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if (lseek(fd,(off_t) (pos + 8 * h2),SEEK_SET) == -1) return -1;
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if (cdb_bread(fd,packbuf,8) == -1) return -1;
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poskd = cdb_unpack(packbuf + 4);
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if (!poskd) return 0;
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if (cdb_unpack(packbuf) == h) {
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if (lseek(fd,(off_t) poskd,SEEK_SET) == -1) return -1;
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if (cdb_bread(fd,packbuf,8) == -1) return -1;
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if (cdb_unpack(packbuf) == len)
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switch(match(fd,key,len)) {
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case -1:
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return -1;
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case 1:
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*dlen = cdb_unpack(packbuf + 4);
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return 1;
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}
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}
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if (++h2 == lenhash) h2 = 0;
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}
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return 0;
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}
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