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/******************************************************************************
* $Id: ogrsqliteregexp.cpp 25406 2012-12-30 20:07:19Z rouault $
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: SQLite REGEXP function
* Author: Even Rouault, even dot rouault at mines dash paris dot org
*
******************************************************************************
* Copyright (c) 2012, Even Rouault <even dot rouault at mines dash paris dot org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
/* WARNING: VERY IMPORTANT NOTE: This file MUST not be directly compiled as */
/* a standalone object. It must be included from ogrsqlitevirtualogr.cpp */
/* (actually from ogrsqlitesqlfunctions.cpp) */
#ifndef COMPILATION_ALLOWED
#error See comment in file
#endif
/* This code originates from pcre.c from the sqlite3-pcre extension */
/* from http://laltromondo.dynalias.net/~iki/informatica/soft/sqlite3-pcre/ */
/* whose header is : */
/*
* Written by Alexey Tourbin <at@altlinux.org>.
*
* The author has dedicated the code to the public domain. Anyone is free
* to copy, modify, publish, use, compile, sell, or distribute the original
* code, either in source code form or as a compiled binary, for any purpose,
* commercial or non-commercial, and by any means.
*/
#include "ogrsqliteregexp.h"
#ifdef HAVE_PCRE
#include <pcre.h>
typedef struct {
char *s;
pcre *p;
pcre_extra *e;
} cache_entry;
#ifndef CACHE_SIZE
#define CACHE_SIZE 16
#endif
/************************************************************************/
/* OGRSQLiteREGEXPFunction() */
/************************************************************************/
static
void OGRSQLiteREGEXPFunction(sqlite3_context *ctx, int argc, sqlite3_value **argv)
{
const char *re, *str;
pcre *p;
pcre_extra *e;
CPLAssert(argc == 2);
re = (const char *) sqlite3_value_text(argv[0]);
if (!re) {
sqlite3_result_error(ctx, "no regexp", -1);
return;
}
if( sqlite3_value_type(argv[1]) == SQLITE_NULL )
{
sqlite3_result_int(ctx, 0);
return;
}
str = (const char *) sqlite3_value_text(argv[1]);
if (!str) {
sqlite3_result_error(ctx, "no string", -1);
return;
}
/* simple LRU cache */
int i;
int found = 0;
cache_entry *cache = (cache_entry*) sqlite3_user_data(ctx);
CPLAssert(cache);
for (i = 0; i < CACHE_SIZE && cache[i].s; i++)
{
if (strcmp(re, cache[i].s) == 0) {
found = 1;
break;
}
}
if (found)
{
if (i > 0)
{
cache_entry c = cache[i];
memmove(cache + 1, cache, i * sizeof(cache_entry));
cache[0] = c;
}
}
else
{
cache_entry c;
const char *err;
int pos;
c.p = pcre_compile(re, 0, &err, &pos, NULL);
if (!c.p)
{
char *e2 = sqlite3_mprintf("%s: %s (offset %d)", re, err, pos);
sqlite3_result_error(ctx, e2, -1);
sqlite3_free(e2);
return;
}
c.e = pcre_study(c.p, 0, &err);
c.s = VSIStrdup(re);
if (!c.s)
{
sqlite3_result_error(ctx, "strdup: ENOMEM", -1);
pcre_free(c.p);
pcre_free(c.e);
return;
}
i = CACHE_SIZE - 1;
if (cache[i].s)
{
CPLFree(cache[i].s);
CPLAssert(cache[i].p);
pcre_free(cache[i].p);
pcre_free(cache[i].e);
}
memmove(cache + 1, cache, i * sizeof(cache_entry));
cache[0] = c;
}
p = cache[0].p;
e = cache[0].e;
int rc;
CPLAssert(p);
rc = pcre_exec(p, e, str, strlen(str), 0, 0, NULL, 0);
sqlite3_result_int(ctx, rc >= 0);
}
#endif // HAVE_PCRE
/************************************************************************/
/* OGRSQLiteRegisterRegExpFunction() */
/************************************************************************/
static
void* OGRSQLiteRegisterRegExpFunction(sqlite3* hDB)
{
#ifdef HAVE_PCRE
/* For debugging purposes mostly */
if( !CSLTestBoolean(CPLGetConfigOption("OGR_SQLITE_REGEXP", "YES")) )
return NULL;
/* Check if we really need to define our own REGEXP function */
int rc = sqlite3_exec(hDB, "SELECT 'a' REGEXP 'a'", NULL, NULL, NULL);
if( rc == SQLITE_OK )
{
CPLDebug("SQLITE", "REGEXP already available");
return NULL;
}
cache_entry *cache = (cache_entry*) CPLCalloc(CACHE_SIZE, sizeof(cache_entry));
sqlite3_create_function(hDB, "REGEXP", 2, SQLITE_UTF8, cache,
OGRSQLiteREGEXPFunction, NULL, NULL);
/* To clear the error flag */
sqlite3_exec(hDB, "SELECT 1", NULL, NULL, NULL);
return cache;
#else // HAVE_PCRE
return NULL;
#endif // HAVE_PCRE
}
/************************************************************************/
/* OGRSQLiteFreeRegExpCache() */
/************************************************************************/
static
void OGRSQLiteFreeRegExpCache(void* hRegExpCache)
{
#ifdef HAVE_PCRE
if( hRegExpCache == NULL )
return;
cache_entry *cache = (cache_entry*) hRegExpCache;
int i;
for (i = 0; i < CACHE_SIZE && cache[i].s; i++)
{
CPLFree(cache[i].s);
CPLAssert(cache[i].p);
pcre_free(cache[i].p);
pcre_free(cache[i].e);
}
CPLFree(cache);
#endif // HAVE_PCRE
}
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