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Introduce DAAP-specific collation function for SQLite

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Kai Elwert 2010-08-29 10:21:35 +02:00 committed by Julien BLACHE
parent 471f750a8c
commit f79dbc93cb
1 changed files with 63 additions and 0 deletions
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63
src/db.c
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2009-2010 Julien BLACHE <jb@jblache.org>
* Copyright (C) 2010 Kai Elwert <elwertk@googlemail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -26,6 +27,11 @@
#include <time.h>
#include <stdint.h>
#include <inttypes.h>
#include <errno.h>
#include <unistr.h>
#include <unictype.h>
#include <unicase.h>
#include <pthread.h>
@ -3699,6 +3705,54 @@ db_daap_songalbumid_xfunc(sqlite3_context *pv, int n, sqlite3_value **ppv)
sqlite3_result_int64(pv, result);
}
static int
db_daap_unicode_xcollation(void *notused, int llen, const void *left, int rlen, const void *right)
{
ucs4_t lch;
ucs4_t rch;
int lalpha;
int ralpha;
int rpp;
int ret;
/* Extract first utf-8 character */
ret = u8_mbtoucr(&lch, (const uint8_t *)left, llen);
if (ret < 0)
{
DPRINTF(E_LOG, L_DB, "DAAP collation: error %d in u8_mbtoucr (left)\n", ret);
return 0;
}
ret = u8_mbtoucr(&rch, (const uint8_t *)right, rlen);
if (ret < 0)
{
DPRINTF(E_LOG, L_DB, "DAAP collation: error %d in u8_mbtoucr (right)\n", ret);
return 0;
}
/* Ensure digits and other non-alphanum sort to tail */
lalpha = uc_is_alpha(lch);
ralpha = uc_is_alpha(rch);
if (!lalpha && ralpha)
return 1;
else if (lalpha && !ralpha)
return -1;
/* Compare case and normalization insensitive */
ret = u8_casecmp((const uint8_t *)left, llen, (const uint8_t*)right, rlen, NULL, UNINORM_NFD, &rpp);
if (ret < 0)
{
DPRINTF(E_LOG, L_DB, "DAAP collation: error in u8_casecmp: %s\n", strerror(errno));
return 0;
}
return rpp;
}
int
db_perthread_init(void)
@ -3723,6 +3777,15 @@ db_perthread_init(void)
return -1;
}
ret = sqlite3_create_collation(hdl, "DAAP", SQLITE_UTF8, NULL, db_daap_unicode_xcollation);
if (ret != SQLITE_OK)
{
DPRINTF(E_LOG, L_DB, "Could not create sqlite3 custom collation DAAP: %s\n", sqlite3_errmsg(hdl));
sqlite3_close(hdl);
return -1;
}
return 0;
}