mdw@git.distorted.org.uk Git - qmail/blob - cdbmss.c

   1 #include "readwrite.h"
   2 #include "seek.h"
   3 #include "alloc.h"
   4 #include "cdbmss.h"
   5
   6 int cdbmss_start(c,fd)
   7 struct cdbmss *c;
   8 int fd;
   9 {
  10   cdbmake_init(&c->cdbm);
  11   c->fd = fd;
  12   c->pos = sizeof(c->cdbm.final);
  13   substdio_fdbuf(&c->ss,write,fd,c->ssbuf,sizeof(c->ssbuf));
  14   return seek_set(fd,(seek_pos) c->pos);
  15 }
  16
  17 int cdbmss_add(c,key,keylen,data,datalen)
  18 struct cdbmss *c;
  19 unsigned char *key;
  20 unsigned int keylen;
  21 unsigned char *data;
  22 unsigned int datalen;
  23 {
  24   uint32 h;
  25   int i;
  26
  27   cdbmake_pack(c->packbuf,(uint32) keylen);
  28   cdbmake_pack(c->packbuf + 4,(uint32) datalen);
  29   if (substdio_put(&c->ss,c->packbuf,8) == -1) return -1;
  30   if (substdio_put(&c->ss,key,keylen) == -1) return -1;
  31   if (substdio_put(&c->ss,data,datalen) == -1) return -1;
  32
  33   h = CDBMAKE_HASHSTART;
  34   for (i = 0;i < keylen;++i)
  35     h = cdbmake_hashadd(h,(unsigned int) key[i]);
  36
  37   if (!cdbmake_add(&c->cdbm,h,c->pos,alloc)) return -1;
  38
  39   c->pos += 8 + keylen + datalen; /* XXX: overflow? */
  40   return 0;
  41 }
  42
  43 int cdbmss_finish(c)
  44 struct cdbmss *c;
  45 {
  46   int i;
  47   uint32 len;
  48   uint32 u;
  49
  50   if (!cdbmake_split(&c->cdbm,alloc)) return -1;
  51
  52   for (i = 0;i < 256;++i) {
  53     len = cdbmake_throw(&c->cdbm,c->pos,i);
  54     for (u = 0;u < len;++u) {
  55       cdbmake_pack(c->packbuf,c->cdbm.hash[u].h);
  56       cdbmake_pack(c->packbuf + 4,c->cdbm.hash[u].p);
  57       if (substdio_put(&c->ss,c->packbuf,8) == -1) return -1;
  58       c->pos += 8; /* XXX: overflow? */
  59     }
  60   }
  61
  62   if (substdio_flush(&c->ss) == -1) return -1;
  63   if (seek_begin(c->fd) == -1) return -1;
  64   return substdio_putflush(&c->ss,c->cdbm.final,sizeof(c->cdbm.final));
  65 }