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d964e73160
The install_cdb.sh script fills the gap of installing header files and creating a cdb library which programs can link against.
227 lines
4.2 KiB
C
227 lines
4.2 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 4 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2002 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.02 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_02.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Sascha Schumann <sascha@schumann.cx> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "php.h"
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#if DBA_CDB
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#include "php_cdb.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <cdb.h>
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#include <uint32.h>
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#define CDB_INFO \
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dba_cdb *cdb = (dba_cdb *) info->dbf
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typedef struct {
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struct cdb c;
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int fd;
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uint32 eod; /* size of constant database */
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uint32 pos; /* current position for traversing */
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} dba_cdb;
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DBA_OPEN_FUNC(cdb)
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{
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int gmode = 0;
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int fd;
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dba_cdb *cdb;
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dba_info *pinfo = (dba_info *) info;
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switch (info->mode) {
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case DBA_READER:
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gmode = O_RDONLY; break;
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/* currently not supported: */
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#if 0
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case DBA_WRITER:
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gmode = O_RDWR; break;
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#endif
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default:
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return FAILURE;
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}
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fd = VCWD_OPEN(info->path, gmode);
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if (fd < 0) {
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return FAILURE;
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}
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cdb = malloc(sizeof *cdb);
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memset(cdb, 0, sizeof *cdb);
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cdb_init(&cdb->c, fd);
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cdb->fd = fd;
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pinfo->dbf = cdb;
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return SUCCESS;
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}
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DBA_CLOSE_FUNC(cdb)
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{
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CDB_INFO;
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/* cdb_free does not close associated fd */
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cdb_free(&cdb->c);
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close(cdb->fd);
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free(cdb);
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}
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DBA_FETCH_FUNC(cdb)
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{
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CDB_INFO;
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unsigned int len;
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char *new_entry = NULL;
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if (cdb_find(&cdb->c, key, keylen) == 1) {
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len = cdb_datalen(&cdb->c);
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new_entry = emalloc(len);
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if (cdb_read(&cdb->c, new_entry, len, cdb_datapos(&cdb->c)) == -1) {
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free(new_entry);
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return NULL;
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}
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if (newlen)
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*newlen = len;
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}
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return new_entry;
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}
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DBA_UPDATE_FUNC(cdb)
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{
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/* if anyone figures out cdbmake.c, let me know */
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return FAILURE;
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}
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DBA_EXISTS_FUNC(cdb)
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{
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CDB_INFO;
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if (cdb_find(&cdb->c, key, keylen) == 1)
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return SUCCESS;
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return FAILURE;
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}
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DBA_DELETE_FUNC(cdb)
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{
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return FAILURE;
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}
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#define CREAD(n) do { \
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if (read(cdb->fd, buf, n) < n) return NULL; \
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} while (0)
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#define CSEEK(n) do { \
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if (n >= cdb->eod) return NULL; \
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if (lseek(cdb->fd, (off_t)n, SEEK_SET) != (off_t) n) return NULL; \
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} while (0)
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DBA_FIRSTKEY_FUNC(cdb)
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{
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CDB_INFO;
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uint32 klen, dlen;
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char buf[8];
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char *key;
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cdb->eod = -1;
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CSEEK(0);
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CREAD(4);
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/* Total length of file in bytes */
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uint32_unpack(buf, &cdb->eod);
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CSEEK(2048);
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CREAD(8);
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/* The first four bytes contain the length of the key */
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uint32_unpack(buf, &klen);
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uint32_unpack(buf + 4, &dlen);
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key = emalloc(klen + 1);
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if (read(cdb->fd, key, klen) < klen) {
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efree(key);
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key = NULL;
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} else {
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key[klen] = '\0';
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if (newlen) *newlen = klen;
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}
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/* header + klenlen + dlenlen + klen + dlen */
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cdb->pos = 2048 + 4 + 4 + klen + dlen;
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return key;
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}
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DBA_NEXTKEY_FUNC(cdb)
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{
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CDB_INFO;
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uint32 klen, dlen;
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char buf[8];
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char *key;
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CSEEK(cdb->pos);
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CREAD(8);
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uint32_unpack(buf, &klen);
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uint32_unpack(buf + 4, &dlen);
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key = emalloc(klen + 1);
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if (read(cdb->fd, key, klen) < klen) {
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efree(key);
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key = NULL;
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} else {
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key[klen] = '\0';
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if (newlen) *newlen = klen;
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}
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cdb->pos += 8 + klen + dlen;
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return key;
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}
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DBA_OPTIMIZE_FUNC(cdb)
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{
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return SUCCESS;
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}
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DBA_SYNC_FUNC(cdb)
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{
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/* this is read-only */
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return SUCCESS;
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}
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#endif
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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