/*      $NetBSD: citrus_esdb.c,v 1.5 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.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_esdb.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <sys/types.h>

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_lookup.h"
#include "citrus_db.h"
#include "citrus_db_hash.h"
#include "citrus_esdb.h"
#include "citrus_esdb_file.h"

#define ESDB_DIR        "esdb.dir"
#define ESDB_ALIAS      "esdb.alias"

/*
* _citrus_esdb_alias:
*      resolve encoding scheme name aliases.
*/
const char *
_citrus_esdb_alias(const char *esname, char *buf, size_t bufsize)
{
       return _lookup_alias(_PATH_ESDB "/" ESDB_ALIAS, esname, buf, bufsize,
                            _LOOKUP_CASE_IGNORE);
}


/*
* conv_esdb:
*      external representation -> local structure.
*/
static int
conv_esdb(struct _citrus_esdb *esdb, struct _region *fr)
{
       int ret;
       struct _citrus_db *db;
       uint32_t version, num_charsets, csid, i, tmp;
       char buf[100];
       const char *str;

       /* open db */
       ret = _db_open(&db, fr, _CITRUS_ESDB_MAGIC, &_db_hash_std, NULL);
       if (ret)
               goto err0;

       /* check version */
       ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_VERSION, &version, NULL);
       if (ret)
               goto err1;
       switch (version) {
       case 0x00000001:
               /* current version */
               /* initial version */
               break;
       default:
               ret = EFTYPE;
               goto err1;
       }

       /* get encoding/variable */
       ret = _db_lookupstr_by_s(db, _CITRUS_ESDB_SYM_ENCODING, &str, NULL);
       if (ret)
               goto err1;
       esdb->db_encname = strdup(str);
       if (esdb->db_encname == NULL) {
               ret = errno;
               goto err1;
       }

       esdb->db_len_variable = 0;
       esdb->db_variable = NULL;
       ret = _db_lookupstr_by_s(db, _CITRUS_ESDB_SYM_VARIABLE, &str, NULL);
       if (ret == 0) {
               esdb->db_len_variable = strlen(str)+1;
               esdb->db_variable = strdup(str);
               if (esdb->db_variable == NULL) {
                       ret = errno;
                       goto err2;
               }
       } else if (ret != ENOENT)
               goto err2;

       /* get number of charsets */
       ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_NUM_CHARSETS,
                               &num_charsets, NULL);
       if (ret)
               goto err3;
       esdb->db_num_charsets = num_charsets;

       /* get invalid character */
       ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_INVALID, &tmp, NULL);
       if (ret == 0) {
               esdb->db_use_invalid = 1;
               esdb->db_invalid = tmp;
       } else if (ret == ENOENT)
               esdb->db_use_invalid = 0;
       else
               goto err3;

       /* get charsets */
       esdb->db_charsets = malloc(num_charsets * sizeof(*esdb->db_charsets));
       if (esdb->db_charsets == NULL) {
               ret = errno;
               goto err3;
       }
       for (i = 0; i < num_charsets; i++) {
               snprintf(buf, sizeof(buf),
                   _CITRUS_ESDB_SYM_CSID_PREFIX "%d", i);
               ret = _db_lookup32_by_s(db, buf, &csid, NULL);
               if (ret)
                       goto err4;
               esdb->db_charsets[i].ec_csid = csid;

               snprintf(buf, sizeof(buf),
                   _CITRUS_ESDB_SYM_CSNAME_PREFIX "%d", i);
               ret = _db_lookupstr_by_s(db, buf, &str, NULL);
               if (ret)
                       goto err4;
               esdb->db_charsets[i].ec_csname = strdup(str);
               if (esdb->db_charsets[i].ec_csname == NULL) {
                       ret = errno;
                       goto err4;
               }
       }

       _db_close(db);
       return 0;

err4:
       for (; i > 0; i--)
               free(esdb->db_charsets[i - 1].ec_csname);
       free(esdb->db_charsets);
err3:
       free(esdb->db_variable);
err2:
       free(esdb->db_encname);
err1:
       _db_close(db);
       if (ret == ENOENT)
               ret = EFTYPE;
err0:
       return ret;
}

/*
* _citrus_esdb_open:
*      open an ESDB file.
*/
int
_citrus_esdb_open(struct _citrus_esdb *db, const char *esname)
{
       int ret;
       const char *realname, *encfile;
       char buf1[PATH_MAX], buf2[PATH_MAX], path[PATH_MAX];
       struct _region fr;

       _DIAGASSERT(esname != NULL);

       snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, ESDB_ALIAS);
       realname = _lookup_alias(path, esname, buf1, sizeof(buf1),
                                _LOOKUP_CASE_IGNORE);

       snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, ESDB_DIR);
       encfile = _lookup_simple(path, realname, buf2, sizeof(buf2),
                                _LOOKUP_CASE_IGNORE);
       if (encfile==NULL)
               return ENOENT;

       /* open file */
       snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, encfile);
       ret = _map_file(&fr, path);
       if (ret)
               return ret;

       ret = conv_esdb(db, &fr);

       _unmap_file(&fr);

       return ret;
}

/*
* _citrus_esdb_close:
*      free an ESDB.
*/
void
_citrus_esdb_close(struct _citrus_esdb *db)
{
       int i;

       _DIAGASSERT(db != NULL);
       _DIAGASSERT(db->db_num_charsets == 0 || db->db_charsets != NULL);

       for (i = 0; i < db->db_num_charsets; i++)
               free(db->db_charsets[i].ec_csname);
       db->db_num_charsets = 0;
       free(db->db_charsets); db->db_charsets = NULL;
       free(db->db_encname); db->db_encname = NULL;
       db->db_len_variable = 0;
       free(db->db_variable); db->db_variable = NULL;
}

/*
* _citrus_esdb_free_list:
*      free the list.
*/
void
_citrus_esdb_free_list(char **list, size_t num)
{
       size_t i;

       for (i = 0; i < num; i++)
               free(list[i]);
       free(list);
}

/*
* _citrus_esdb_get_list:
*      get esdb entries.
*/
int
_citrus_esdb_get_list(char ***rlist, size_t *rnum)
{
       int ret;
       struct _region key;
       size_t num;
       struct _citrus_lookup *cla, *cld;
       char **list, **q;
       char buf[PATH_MAX];

       num = 0;

       ret = _lookup_seq_open(&cla, _PATH_ESDB "/" ESDB_ALIAS,
                              _LOOKUP_CASE_IGNORE);
       if (ret)
               goto quit0;

       ret = _lookup_seq_open(&cld, _PATH_ESDB "/" ESDB_DIR,
                              _LOOKUP_CASE_IGNORE);
       if (ret)
               goto quit1;

       /* count number of entries */
       num = _lookup_get_num_entries(cla) + _lookup_get_num_entries(cld);

       _lookup_seq_rewind(cla);
       _lookup_seq_rewind(cld);

       /* allocate list pointer space */
       list = malloc(num * sizeof(char *));
       num = 0;
       if (list == NULL) {
               ret = errno;
               goto quit3;
       }

       /* get alias entries */
       while ((ret = _lookup_seq_next(cla, &key, NULL)) == 0) {
               snprintf(buf, sizeof(buf), "%.*s",
                        (int)_region_size(&key),
                        (const char *)_region_head(&key));
               _bcs_convert_to_lower(buf);
               list[num] = strdup(buf);
               if (list[num] == NULL) {
                       ret = errno;
                       goto quit3;
               }
               num++;
       }
       if (ret != ENOENT)
               goto quit3;
       /* get dir entries */
       while ((ret = _lookup_seq_next(cld, &key, NULL)) == 0) {
               /* check duplicated entry */
               snprintf(buf, sizeof(buf), "%.*s",
                        (int)_region_size(&key),
                        (const char *)_region_head(&key));
               _bcs_convert_to_lower(buf);
               ret = _lookup_seq_lookup(cla, buf, NULL);
               if (ret) {
                       if (ret != ENOENT)
                               goto quit3;
                       /* not duplicated */
                       list[num] = strdup(buf);
                       if (list[num] == NULL) {
                               ret = errno;
                               goto quit3;
                       }
                       num++;
               }
       }
       if (ret != ENOENT)
               goto quit3;

       ret = 0;
       q = realloc(list, num * sizeof(char *));
       if (!q) {
               ret = ENOMEM;
               goto quit3;
       }
       list = q;
       *rlist = list;
       *rnum = num;
quit3:
       if (ret)
               _citrus_esdb_free_list(list, num);
       _lookup_seq_close(cld);
quit1:
       _lookup_seq_close(cla);
quit0:
       return ret;
}

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