mirror of
https://github.com/owntone/owntone-server.git
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b3bfb0a5f6
The purpose of this is to support library backends making their own calculation of these id's, which is relevant if they have more information available than just album_artist and album. This also removes a bunch of sqlite extension code plus some triggers, which in itself is probably an improvement.
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* Copyright (C) 2009-2010 Julien BLACHE <jb@jblache.org>
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* Copyright (C) 2010 Kai Elwert <elwertk@googlemail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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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 <string.h>
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#include <stdint.h>
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#include <unistr.h>
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#include <unictype.h>
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#include <unicase.h>
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#include <sqlite3ext.h>
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SQLITE_EXTENSION_INIT1
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static void
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sqlext_daap_no_zero_xfunc(sqlite3_context *pv, int n, sqlite3_value **ppv)
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{
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sqlite3_int64 new_value;
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sqlite3_int64 old_value;
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if (n != 2)
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{
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sqlite3_result_error(pv, "daap_no_zero() requires 2 parameters, new_value and old_value", -1);
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return;
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}
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if ((sqlite3_value_type(ppv[0]) != SQLITE_INTEGER)
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|| (sqlite3_value_type(ppv[1]) != SQLITE_INTEGER))
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{
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sqlite3_result_error(pv, "daap_no_zero() requires 2 integer parameters", -1);
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return;
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}
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new_value = sqlite3_value_int64(ppv[0]);
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old_value = sqlite3_value_int64(ppv[1]);
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if (new_value != 0)
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sqlite3_result_int64(pv, new_value);
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else
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sqlite3_result_int64(pv, old_value);
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}
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static int
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sqlext_daap_unicode_xcollation(void *notused, int llen, const void *left, int rlen, const void *right)
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{
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ucs4_t lch;
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ucs4_t rch;
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int lalpha;
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int ralpha;
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int rpp;
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int ret;
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/* Extract first utf-8 character */
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ret = u8_mbtoucr(&lch, (const uint8_t *)left, llen);
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if (ret < 0)
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return 0;
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ret = u8_mbtoucr(&rch, (const uint8_t *)right, rlen);
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if (ret < 0)
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return 0;
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/* Ensure digits and other non-alphanum sort to tail */
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lalpha = uc_is_alpha(lch);
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ralpha = uc_is_alpha(rch);
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if (!lalpha && ralpha)
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return 1;
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else if (lalpha && !ralpha)
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return -1;
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/* Compare case and normalization insensitive */
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ret = u8_casecmp((const uint8_t *)left, llen, (const uint8_t*)right, rlen, NULL, UNINORM_NFD, &rpp);
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if (ret < 0)
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return 0;
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return rpp;
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}
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int
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sqlite3_extension_init(sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi)
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{
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SQLITE_EXTENSION_INIT2(pApi);
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int ret;
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ret = sqlite3_create_function(db, "daap_no_zero", 2, SQLITE_UTF8, NULL, sqlext_daap_no_zero_xfunc, NULL, NULL);
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if (ret != SQLITE_OK)
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{
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if (pzErrMsg)
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*pzErrMsg = sqlite3_mprintf("Could not create daap_no_zero function: %s\n", sqlite3_errmsg(db));
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return -1;
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}
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ret = sqlite3_create_collation(db, "DAAP", SQLITE_UTF8, NULL, sqlext_daap_unicode_xcollation);
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if (ret != SQLITE_OK)
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{
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if (pzErrMsg)
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*pzErrMsg = sqlite3_mprintf("Could not create sqlite3 custom collation DAAP: %s\n", sqlite3_errmsg(db));
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return -1;
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}
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return 0;
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}
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