minix/lib/libc/citrus/citrus_db_factory.c

354 lines
8.6 KiB
C
Raw Normal View History

/* $NetBSD: citrus_db_factory.c,v 1.9 2008/02/09 14:56:20 junyoung Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_db_factory.c,v 1.9 2008/02/09 14:56:20 junyoung Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/queue.h>
#include "citrus_namespace.h"
#include "citrus_region.h"
#include "citrus_db_file.h"
#include "citrus_db_factory.h"
struct _citrus_db_factory_entry {
SIMPLEQ_ENTRY(_citrus_db_factory_entry) de_entry;
struct _citrus_db_factory_entry *de_next;
uint32_t de_hashvalue;
struct _region de_key;
int de_key_free;
struct _region de_data;
int de_data_free;
int de_idx;
};
struct _citrus_db_factory {
size_t df_num_entries;
SIMPLEQ_HEAD(, _citrus_db_factory_entry) df_entries;
size_t df_total_key_size;
size_t df_total_data_size;
uint32_t (*df_hashfunc)(void *, struct _citrus_region *);
void *df_hashfunc_closure;
};
#define DB_ALIGN 16
int
_citrus_db_factory_create(struct _citrus_db_factory **rdf,
_citrus_db_hash_func_t hashfunc,
void *hashfunc_closure)
{
struct _citrus_db_factory *df;
df = malloc(sizeof(*df));
if (df == NULL)
return errno;
df->df_num_entries = 0;
df->df_total_key_size = df->df_total_data_size = 0;
SIMPLEQ_INIT(&df->df_entries);
df->df_hashfunc = hashfunc;
df->df_hashfunc_closure = hashfunc_closure;
*rdf = df;
return 0;
}
void
_citrus_db_factory_free(struct _citrus_db_factory *df)
{
struct _citrus_db_factory_entry *de;
while ((de = SIMPLEQ_FIRST(&df->df_entries)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&df->df_entries, de_entry);
if (de->de_key_free)
free(_region_head(&de->de_key));
if (de->de_data_free)
free(_region_head(&de->de_data));
free(de);
}
free(df);
}
static __inline size_t
ceilto(size_t sz)
{
return (sz+DB_ALIGN-1) & ~(DB_ALIGN-1);
}
int
_citrus_db_factory_add(struct _citrus_db_factory *df,
struct _region *key, int keyfree,
struct _region *data, int datafree)
{
struct _citrus_db_factory_entry *de;
de = malloc(sizeof(*de));
if (de == NULL)
return -1;
de->de_hashvalue = df->df_hashfunc(df->df_hashfunc_closure, key);
de->de_key = *key;
de->de_key_free = keyfree;
de->de_data = *data;
de->de_data_free = datafree;
de->de_idx = -1;
SIMPLEQ_INSERT_TAIL(&df->df_entries, de, de_entry);
df->df_total_key_size += _region_size(key);
df->df_total_data_size += ceilto(_region_size(data));
df->df_num_entries++;
return 0;
}
int
_citrus_db_factory_add_by_string(struct _citrus_db_factory *df,
const char *key,
struct _citrus_region *data, int datafree)
{
struct _region r;
char *tmp;
tmp = strdup(key);
if (tmp == NULL)
return errno;
_region_init(&r, tmp, strlen(key));
return _citrus_db_factory_add(df, &r, 1, data, datafree);
}
int
_citrus_db_factory_add8_by_string(struct _citrus_db_factory *df,
const char *key, uint8_t val)
{
struct _region r;
uint8_t *p;
p = malloc(sizeof(*p));
if (p == NULL)
return errno;
*p = val;
_region_init(&r, p, 1);
return _citrus_db_factory_add_by_string(df, key, &r, 1);
}
int
_citrus_db_factory_add16_by_string(struct _citrus_db_factory *df,
const char *key, uint16_t val)
{
struct _region r;
uint16_t *p;
p = malloc(sizeof(*p));
if (p == NULL)
return errno;
*p = htons(val);
_region_init(&r, p, 2);
return _citrus_db_factory_add_by_string(df, key, &r, 1);
}
int
_citrus_db_factory_add32_by_string(struct _citrus_db_factory *df,
const char *key, uint32_t val)
{
struct _region r;
uint32_t *p;
p = malloc(sizeof(*p));
if (p == NULL)
return errno;
*p = htonl(val);
_region_init(&r, p, 4);
return _citrus_db_factory_add_by_string(df, key, &r, 1);
}
int
_citrus_db_factory_add_string_by_string(struct _citrus_db_factory *df,
const char *key, const char *data)
{
char *p;
struct _region r;
p = strdup(data);
if (p == NULL)
return errno;
_region_init(&r, p, strlen(p)+1);
return _citrus_db_factory_add_by_string(df, key, &r, 1);
}
size_t
_citrus_db_factory_calc_size(struct _citrus_db_factory *df)
{
size_t sz;
sz = ceilto(_CITRUS_DB_HEADER_SIZE);
sz += ceilto(_CITRUS_DB_ENTRY_SIZE * df->df_num_entries);
sz += ceilto(df->df_total_key_size);
sz += df->df_total_data_size;
return sz;
}
static __inline void
put8(struct _region *r, size_t *rofs, uint8_t val)
{
*(uint8_t *)_region_offset(r, *rofs) = val;
*rofs += 1;
}
static __inline void
put16(struct _region *r, size_t *rofs, uint16_t val)
{
val = htons(val);
memcpy(_region_offset(r, *rofs), &val, 2);
*rofs += 2;
}
static __inline void
put32(struct _region *r, size_t *rofs, uint32_t val)
{
val = htonl(val);
memcpy(_region_offset(r, *rofs), &val, 4);
*rofs += 4;
}
static __inline void
putpad(struct _region *r, size_t *rofs)
{
size_t i;
for (i = ceilto(*rofs) - *rofs; i > 0; i--)
put8(r, rofs, 0);
}
static __inline void
dump_header(struct _region *r, const char *magic, size_t *rofs,
size_t num_entries)
{
while (*rofs<_CITRUS_DB_MAGIC_SIZE)
put8(r, rofs, *magic++);
put32(r, rofs, num_entries);
put32(r, rofs, _CITRUS_DB_HEADER_SIZE);
}
int
_citrus_db_factory_serialize(struct _citrus_db_factory *df, const char *magic,
struct _region *r)
{
size_t i, ofs, keyofs, dataofs, nextofs;
struct _citrus_db_factory_entry *de, **depp, *det;
ofs = 0;
/* check whether more than 0 entries exist */
if (df->df_num_entries == 0) {
dump_header(r, magic, &ofs, 0);
return 0;
}
/* allocate hash table */
depp = malloc(sizeof(*depp) * df->df_num_entries);
if (depp == NULL)
return -1;
for (i = 0; i < df->df_num_entries; i++)
depp[i] = NULL;
/* step1: store the entries which are not conflicting */
SIMPLEQ_FOREACH(de, &df->df_entries, de_entry) {
de->de_hashvalue %= df->df_num_entries;
de->de_idx = -1;
de->de_next = NULL;
if (depp[de->de_hashvalue] == NULL) {
depp[de->de_hashvalue] = de;
de->de_idx = (int)de->de_hashvalue;
}
}
/* step2: resolve conflicts */
i = 0;
SIMPLEQ_FOREACH(de, &df->df_entries, de_entry) {
if (de->de_idx == -1) {
det = depp[de->de_hashvalue];
while (det->de_next != NULL)
det = det->de_next;
det->de_next = de;
while (depp[i] != NULL)
i++;
depp[i] = de;
de->de_idx = (int)i;
}
}
keyofs =
_CITRUS_DB_HEADER_SIZE +
ceilto(df->df_num_entries*_CITRUS_DB_ENTRY_SIZE);
dataofs = keyofs + ceilto(df->df_total_key_size);
/* dump header */
dump_header(r, magic, &ofs, df->df_num_entries);
/* dump entries */
for (i = 0; i < df->df_num_entries; i++) {
de = depp[i];
nextofs = 0;
if (de->de_next) {
nextofs =
_CITRUS_DB_HEADER_SIZE +
de->de_next->de_idx * _CITRUS_DB_ENTRY_SIZE;
}
put32(r, &ofs, de->de_hashvalue);
put32(r, &ofs, nextofs);
put32(r, &ofs, keyofs);
put32(r, &ofs, _region_size(&de->de_key));
put32(r, &ofs, dataofs);
put32(r, &ofs, _region_size(&de->de_data));
memcpy(_region_offset(r, keyofs),
_region_head(&de->de_key), _region_size(&de->de_key));
keyofs += _region_size(&de->de_key);
memcpy(_region_offset(r, dataofs),
_region_head(&de->de_data), _region_size(&de->de_data));
dataofs += _region_size(&de->de_data);
putpad(r, &dataofs);
}
putpad(r, &ofs);
putpad(r, &keyofs);
free(depp);
return 0;
}