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/*
"Spam Filter"-Plugin for Miranda IM
Copyright 2003-2006 Heiko Herkenrath
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 the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program ("SpamFilter-License.txt"); if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// -- Defines
//#define DISABLE_REGEXP_SUPPORT
// -- Includes
#include "common.h"
#include "Utilities/PCRE/include/pcre.h"
// -- Variables
HMODULE hPcreDLL = NULL;
// -- Function Pointers
int (*dyn_pcre_config)(int, void*);
pcre* (*dyn_pcre_compile)(const char*, int, const char**, int*, const unsigned char*);
pcre_extra* (*dyn_pcre_study)(const pcre*, int, const char **);
int (*dyn_pcre_exec)(const pcre*, const pcre_extra*, const char*, int, int, int, int*, int);
void (**dyn_pointer_pcre_free)(void*);
#define dyn_pcre_free (*dyn_pointer_pcre_free);
// -----------------------------------------
BOOL RegExpExistsInString(const WCHAR* pszString, const WCHAR* pszRegEx, BOOL bCaseSensitive, BOOL* pbRegExMalformed)
{
if (pbRegExMalformed) *pbRegExMalformed = FALSE;
if (!pszString || !pszRegEx) return FALSE;
if (hPcreDLL)
{
int iRc;
pcre* pPcre;
pcre_extra* pExtra;
// Following are dummy buffers that are needed for the functions to work
const char* pszErr;
int iErrOffset;
// 1.) Interpret regular expression
#if defined(UNICODE)
{
char* pszRegExUtf8 = mir_utf8encodeW(pszRegEx);
if (pszRegExUtf8)
{
pPcre = dyn_pcre_compile(pszRegExUtf8, (bCaseSensitive ? 0 : PCRE_CASELESS)|PCRE_UTF8|PCRE_NO_UTF8_CHECK, &pszErr, &iErrOffset, NULL);
mir_free(pszRegExUtf8);
} else {
pPcre = NULL;
}
}
#else
pPcre = dyn_pcre_compile(pszRegEx, (bCaseSensitive ? 0 : PCRE_CASELESS), &pszErr, &iErrOffset, NULL);
#endif
if (pPcre)
{
// 2.) Study regular expression (not necessary)
pExtra = dyn_pcre_study(pPcre, 0, &pszErr);
// 3.) Search for regular expression
#if defined(UNICODE)
{
char* pszStringUtf8 = mir_utf8encodeW(pszString);
if (pszStringUtf8)
{
iRc = dyn_pcre_exec(pPcre, pExtra, (char*)pszStringUtf8, (int)lstrlenA(pszStringUtf8), 0, PCRE_NOTEMPTY|PCRE_NO_UTF8_CHECK, NULL, 0);
mir_free(pszStringUtf8);
} else {
iRc = 0;
}
}
#else
iRc = dyn_pcre_exec(pPcre, pExtra, pszString, (int)lstrlen(pszString), 0, PCRE_NOTEMPTY, NULL, 0);
#endif
// Release memory
dyn_pcre_free(pPcre);
if (pExtra) dyn_pcre_free(pExtra);
return (iRc >= 0);
} else {
if (pbRegExMalformed)
*pbRegExMalformed = TRUE;
#if !defined(_DEBUG)
if (!pbRegExMalformed)
#endif
{
WCHAR szOut[128];
mir_sntprintf(szOut, ARRAYSIZE(szOut), _T("Spam Filter: Syntax error in RegExp (%s).\r\n"), pszRegEx);
OutputDebugString(szOut);
}
}
}
// Default string search (fallback)
return (bCaseSensitive ? StrStr(pszString, pszRegEx) : StrStrI(pszString, pszRegEx)) ? TRUE : FALSE;
}
BOOL ValidateRegExp(const WCHAR* pszRegEx)
{
if (hPcreDLL)
{
pcre* pPcre;
char* pszErr;
int iErrOffset;
// Parameter check
if (!pszRegEx) return FALSE;
// Interpret regular expression
#if defined(UNICODE)
{
char* pszRegExUtf8 = mir_utf8encodeW(pszRegEx);
if (pszRegExUtf8) {
pPcre = dyn_pcre_compile(pszRegExUtf8, PCRE_UTF8|PCRE_NO_UTF8_CHECK, &pszErr, &iErrOffset, NULL);
mir_free(pszRegExUtf8);
} else {
pPcre = NULL;
}
}
#else
pPcre = dyn_pcre_compile(pszRegEx, 0, &pszErr, &iErrOffset, NULL);
#endif
if (pPcre) {
dyn_pcre_free(pPcre); // Release memory
return TRUE;
} else {
return FALSE;
}
} else {
return TRUE;
}
}
BOOL RegExpEnabled(void)
{
return (hPcreDLL ? TRUE : FALSE);
}
// ------------------------------------
void InitRegExp(void)
{
#if !defined(DISABLE_REGEXP_SUPPORT)
hPcreDLL = LoadLibrary(_T("PCRE"));
if (hPcreDLL)
{
// Exported functions
// GetProcAddress returns the pointer to the function
*(FARPROC*)&dyn_pcre_config = GetProcAddress(hPcreDLL, "pcre_config");
*(FARPROC*)&dyn_pcre_compile = GetProcAddress(hPcreDLL, "pcre_compile");
*(FARPROC*)&dyn_pcre_study = GetProcAddress(hPcreDLL, "pcre_study");
*(FARPROC*)&dyn_pcre_exec = GetProcAddress(hPcreDLL, "pcre_exec");
// Exported variables
// GetProcAddress returns the pointer to the variable containing the pointer to the function...jippieh! :-)
*(FARPROC*)&dyn_pointer_pcre_free = GetProcAddress(hPcreDLL, "pcre_free");
if (dyn_pcre_compile && dyn_pcre_exec && dyn_pointer_pcre_free && (*dyn_pointer_pcre_free))
{
#if defined(UNICODE)
int iUtf8Supported = 0;
if (dyn_pcre_config)
dyn_pcre_config(PCRE_CONFIG_UTF8, &iUtf8Supported);
if (iUtf8Supported != 0)
return;
#else
return;
#endif
}
// Error: Unloading
FreeLibrary(hPcreDLL);
hPcreDLL = NULL;
}
// Debug output
OutputDebugString(_T("Spam Filter: RegExp DLL (PCRE.DLL) not found or not compatible.\r\n"));
#else
// Debug output
OutputDebugString(_T("Spam Filter: RegExp support disabled.\r\n"));
#endif
}
void UninitRegExp(void)
{
if (hPcreDLL) FreeLibrary(hPcreDLL);
}
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