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|
/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2003 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Marcus Boerger <helly@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/* incorporated from D.J.Bernstein's cdb-0.75 (http://cr.yp.to/cdb.html)*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "cdb.h"
#include "cdb_make.h"
#include "uint32.h"
/* {{{ cdb_make_write */
static int cdb_make_write(struct cdb_make *c, char *buf, uint32 sz TSRMLS_DC) {
return php_stream_write(c->fp, buf, sz) == sz ? 0 : -1;
}
/* {{{ cdb_posplus */
static int cdb_posplus(struct cdb_make *c, uint32 len)
{
uint32 newpos = c->pos + len;
if (newpos < len) {
errno = ENOMEM;
return -1;
}
c->pos = newpos;
return 0;
}
/* }}} */
/* {{{ cdb_make_start */
int cdb_make_start(struct cdb_make *c, php_stream * f TSRMLS_DC)
{
c->head = 0;
c->split = 0;
c->hash = 0;
c->numentries = 0;
c->fp = f;
c->pos = sizeof(c->final);
if (php_stream_seek(f, c->pos, SEEK_SET) == -1) {
php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Fseek failed");
return -1;
}
return php_stream_tell(c->fp);
}
/* }}} */
/* {{{ cdb_make_addend */
int cdb_make_addend(struct cdb_make *c, unsigned int keylen, unsigned int datalen, uint32 h TSRMLS_DC)
{
struct cdb_hplist *head;
head = c->head;
if (!head || (head->num >= CDB_HPLIST)) {
head = (struct cdb_hplist *)
emalloc(sizeof(struct cdb_hplist));
if (!head)
return -1;
head->num = 0;
head->next = c->head;
c->head = head;
}
head->hp[head->num].h = h;
head->hp[head->num].p = c->pos;
++head->num;
++c->numentries;
if (cdb_posplus(c,8) == -1)
return -1;
if (cdb_posplus(c, keylen) == -1)
return -1;
if (cdb_posplus(c, datalen) == -1)
return -1;
return 0;
}
/* }}} */
/* {{{ cdb_make_addbegin */
int cdb_make_addbegin(struct cdb_make *c, unsigned int keylen, unsigned int datalen TSRMLS_DC)
{
char buf[8];
if (keylen > 0xffffffff) {
errno = ENOMEM;
return -1;
}
if (datalen > 0xffffffff) {
errno = ENOMEM;
return -1;
}
uint32_pack(buf, keylen);
uint32_pack(buf + 4, datalen);
if (cdb_make_write(c, buf, 8 TSRMLS_CC) != 0)
return -1;
return 0;
}
/* {{{ cdb_make_add */
int cdb_make_add(struct cdb_make *c,char *key,unsigned int keylen,char *data,unsigned int datalen TSRMLS_DC)
{
if (cdb_make_addbegin(c, keylen, datalen TSRMLS_CC) == -1)
return -1;
if (cdb_make_write(c, key, keylen TSRMLS_CC) != 0)
return -1;
if (cdb_make_write(c, data, datalen TSRMLS_CC) != 0)
return -1;
return cdb_make_addend(c, keylen, datalen, cdb_hash(key, keylen) TSRMLS_CC);
}
/* }}} */
/* {{{ cdb_make_finish */
int cdb_make_finish(struct cdb_make *c TSRMLS_DC)
{
char buf[8];
int i;
uint32 len;
uint32 u;
uint32 memsize;
uint32 count;
uint32 where;
struct cdb_hplist *x;
struct cdb_hp *hp;
for (i = 0;i < 256;++i)
c->count[i] = 0;
for (x = c->head; x; x = x->next) {
i = x->num;
while (i--)
++c->count[255 & x->hp[i].h];
}
memsize = 1;
for (i = 0;i < 256;++i) {
u = c->count[i] * 2;
if (u > memsize)
memsize = u;
}
memsize += c->numentries; /* no overflow possible up to now */
u = (uint32) 0 - (uint32) 1;
u /= sizeof(struct cdb_hp);
if (memsize > u) {
errno = ENOMEM;
return -1;
}
c->split = (struct cdb_hp *)
emalloc(memsize * sizeof(struct cdb_hp));
if (!c->split)
return -1;
c->hash = c->split + c->numentries;
u = 0;
for (i = 0;i < 256;++i) {
u += c->count[i]; /* bounded by numentries, so no overflow */
c->start[i] = u;
}
for (x = c->head; x; x = x->next) {
i = x->num;
while (i--)
c->split[--c->start[255 & x->hp[i].h]] = x->hp[i];
}
for (i = 0;i < 256;++i) {
count = c->count[i];
len = count + count; /* no overflow possible */
uint32_pack(c->final + 8 * i,c->pos);
uint32_pack(c->final + 8 * i + 4,len);
for (u = 0;u < len;++u)
c->hash[u].h = c->hash[u].p = 0;
hp = c->split + c->start[i];
for (u = 0;u < count;++u) {
where = (hp->h >> 8) % len;
while (c->hash[where].p)
if (++where == len)
where = 0;
c->hash[where] = *hp++;
}
for (u = 0;u < len;++u) {
uint32_pack(buf, c->hash[u].h);
uint32_pack(buf + 4, c->hash[u].p);
if (cdb_make_write(c, buf, 8 TSRMLS_CC) != 0)
return -1;
if (cdb_posplus(c, 8) == -1)
return -1;
}
}
if (c->split)
efree(c->split);
for (x = c->head; x; c->head = x) {
x = x->next;
efree(c->head);
}
if (php_stream_flush(c->fp) != 0)
return -1;
php_stream_rewind(c->fp);
if (php_stream_tell(c->fp) != 0)
return -1;
if (cdb_make_write(c, c->final, sizeof(c->final) TSRMLS_CC) != 0)
return -1;
return php_stream_flush(c->fp);
}
/* }}} */
/* {{{ cdb_make_version */
char *cdb_make_version()
{
return "0.75, $Revision$";
}
|
