int cdb_read(struct cdb *c,char *buf,unsigned int len,uint32 pos)
{
if (c->map) {
if ((pos > c->size) || (c->size - pos < len)) goto FORMAT;
byte_copy(buf,len,c->map + pos);
}
else {
if (seek_set(c->fd,pos) == -1) return -1;
while (len > 0) {
int r;
do
r = read(c->fd,buf,len);
while ((r == -1) && (errno == error_intr));
if (r == -1) return -1;
if (r == 0) goto FORMAT;
buf += r;
len -= r;
}
}
return 0;
FORMAT:
errno = error_proto;
return -1;
}
int cdb_read (struct cdb *c, char *buf, unsigned int len, uint32 pos)
{
if (c->map)
{
if ((pos > c->size) || (c->size - pos < len)) return (errno = EPROTO, -1) ;
byte_copy(buf, len, c->map + pos) ;
}
else
{
if (seek_set(c->fd, pos) < 0) return -1 ;
if (allread(c->fd, buf, len) < len) return -1 ;
}
return 0 ;
}
int cdb_findnext(struct cdb *c, ut32 u, const char *key, unsigned int len) {
char buf[8];
ut32 pos;
int m;
if (!c->loop) {
if (!cdb_read (c, buf, 8, (u << 3) & 2047))
return -1;
ut32_unpack (buf + 4, &c->hslots);
if (!c->hslots) {
return 0;
}
ut32_unpack (buf, &c->hpos);
c->khash = u;
u >>= 8;
u %= c->hslots;
u <<= 3;
c->kpos = c->hpos + u;
}
while (c->loop < c->hslots) {
if (!cdb_read (c, buf, 8, c->kpos))
return 0;
ut32_unpack (buf + 4, &pos);
if (!pos) return 0;
c->loop++;
c->kpos += 8;
if (c->kpos == c->hpos + (c->hslots << 3))
c->kpos = c->hpos;
ut32_unpack (buf, &u);
if (u == c->khash) {
if (!seek_set (c->fd, pos))
return -1;
if (!getkvlen (c->fd, &u, &c->dlen))
return -1;
if (u == 0)
return -1;
if (u == len) {
if ((m = match (c, key, len, pos + KVLSZ))==-1)
return 0;
if (m == 1) {
c->dpos = pos + KVLSZ + len;
return 1;
}
}
}
}
return 0;
}
int cdb_read(struct cdb *c, char *buf, ut32 len, ut32 pos) {
if (c->map) {
if ((pos > c->size) || (c->size - pos < len))
return 0;
byte_copy (buf, len, c->map + pos);
return 1;
}
if (!seek_set (c->fd, pos))
return 0;
while (len > 0) {
ssize_t r = read (c->fd, buf, len);
if (r < 0) return 0;
buf += r;
len -= r;
}
return 1;
}