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/* $Id: cdb_make.c,v 1.12 2006/06/28 17:49:21 mjt Exp $
* basic cdb creation routines
*
* This file is a part of tinycdb package by Michael Tokarev, mjt@corpit.ru.
* Public domain.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "cdb_int.h"
void
cdb_pack(unsigned num, unsigned char buf[4])
{
buf[0] = num & 255; num >>= 8;
buf[1] = num & 255; num >>= 8;
buf[2] = num & 255;
buf[3] = num >> 8;
}
int
cdb_make_start(struct cdb_make *cdbmp, int fd)
{
memset(cdbmp, 0, sizeof(*cdbmp));
cdbmp->cdb_fd = fd;
cdbmp->cdb_dpos = 2048;
cdbmp->cdb_bpos = cdbmp->cdb_buf + 2048;
return 0;
}
int internal_function
_cdb_make_fullwrite(int fd, const unsigned char *buf, unsigned len)
{
while(len) {
int l = write(fd, buf, len);
if (l < 0 && errno != EINTR)
return -1;
len -= l;
buf += l;
}
return 0;
}
int internal_function
_cdb_make_flush(struct cdb_make *cdbmp) {
unsigned len = cdbmp->cdb_bpos - cdbmp->cdb_buf;
if (len) {
if (_cdb_make_fullwrite(cdbmp->cdb_fd, cdbmp->cdb_buf, len) < 0)
return -1;
cdbmp->cdb_bpos = cdbmp->cdb_buf;
}
return 0;
}
int internal_function
_cdb_make_write(struct cdb_make *cdbmp, const unsigned char *ptr, unsigned len)
{
unsigned l = sizeof(cdbmp->cdb_buf) - (cdbmp->cdb_bpos - cdbmp->cdb_buf);
cdbmp->cdb_dpos += len;
if (len > l) {
memcpy(cdbmp->cdb_bpos, ptr, l);
cdbmp->cdb_bpos += l;
if (_cdb_make_flush(cdbmp) < 0)
return -1;
ptr += l; len -= l;
l = len / sizeof(cdbmp->cdb_buf);
if (l) {
l *= sizeof(cdbmp->cdb_buf);
if (_cdb_make_fullwrite(cdbmp->cdb_fd, ptr, l) < 0)
return -1;
ptr += l; len -= l;
}
}
if (len) {
memcpy(cdbmp->cdb_bpos, ptr, len);
cdbmp->cdb_bpos += len;
}
return 0;
}
static int
cdb_make_finish_internal(struct cdb_make *cdbmp)
{
unsigned hcnt[256]; /* hash table counts */
unsigned hpos[256]; /* hash table positions */
struct cdb_rec *htab;
unsigned char *p;
struct cdb_rl *rl;
unsigned hsize;
unsigned t, i;
if (((0xffffffff - cdbmp->cdb_dpos) >> 3) < cdbmp->cdb_rcnt)
return errno = ENOMEM, -1;
/* count htab sizes and reorder reclists */
hsize = 0;
for (t = 0; t < 256; ++t) {
struct cdb_rl *rlt = NULL;
i = 0;
rl = cdbmp->cdb_rec[t];
while(rl) {
struct cdb_rl *rln = rl->next;
rl->next = rlt;
rlt = rl;
i += rl->cnt;
rl = rln;
}
cdbmp->cdb_rec[t] = rlt;
if (hsize < (hcnt[t] = i << 1))
hsize = hcnt[t];
}
/* allocate memory to hold max htable */
htab = (struct cdb_rec*)malloc((hsize + 2) * sizeof(struct cdb_rec));
if (!htab)
return errno = ENOENT, -1;
p = (unsigned char *)htab;
htab += 2;
/* build hash tables */
for (t = 0; t < 256; ++t) {
unsigned len, hi;
hpos[t] = cdbmp->cdb_dpos;
if ((len = hcnt[t]) == 0)
continue;
for (i = 0; i < len; ++i)
htab[i].hval = htab[i].rpos = 0;
for (rl = cdbmp->cdb_rec[t]; rl; rl = rl->next)
for (i = 0; i < rl->cnt; ++i) {
hi = (rl->rec[i].hval >> 8) % len;
while(htab[hi].rpos)
if (++hi == len)
hi = 0;
htab[hi] = rl->rec[i];
}
for (i = 0; i < len; ++i) {
cdb_pack(htab[i].hval, p + (i << 3));
cdb_pack(htab[i].rpos, p + (i << 3) + 4);
}
if (_cdb_make_write(cdbmp, p, len << 3) < 0) {
free(p);
return -1;
}
}
free(p);
if (_cdb_make_flush(cdbmp) < 0)
return -1;
p = cdbmp->cdb_buf;
for (t = 0; t < 256; ++t) {
cdb_pack(hpos[t], p + (t << 3));
cdb_pack(hcnt[t], p + (t << 3) + 4);
}
if (lseek(cdbmp->cdb_fd, 0, 0) != 0 ||
_cdb_make_fullwrite(cdbmp->cdb_fd, p, 2048) != 0)
return -1;
return 0;
}
static void
cdb_make_free(struct cdb_make *cdbmp)
{
unsigned t;
for(t = 0; t < 256; ++t) {
struct cdb_rl *rl = cdbmp->cdb_rec[t];
while(rl) {
struct cdb_rl *tm = rl;
rl = rl->next;
free(tm);
}
}
}
int
cdb_make_finish(struct cdb_make *cdbmp)
{
int r = cdb_make_finish_internal(cdbmp);
cdb_make_free(cdbmp);
return r;
}
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