From 48540940b6c28bb4378abfeb500ec45a625b37b6 Mon Sep 17 00:00:00 2001
From: Vadim Dashevskiy <watcherhd@gmail.com>
Date: Tue, 15 May 2012 10:38:20 +0000
Subject: initial commit

git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
---
 plugins/db3x/dbmodulechain.c | 132 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 plugins/db3x/dbmodulechain.c

(limited to 'plugins/db3x/dbmodulechain.c')

diff --git a/plugins/db3x/dbmodulechain.c b/plugins/db3x/dbmodulechain.c
new file mode 100644
index 0000000000..8b78b4dffa
--- /dev/null
+++ b/plugins/db3x/dbmodulechain.c
@@ -0,0 +1,132 @@
+/*
+
+Miranda IM: the free IM client for Microsoft* Windows*
+
+Copyright 2000-2003 Miranda ICQ/IM project, 
+all portions of this codebase are copyrighted to the people 
+listed in contributors.txt.
+
+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; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+*/
+
+#include "commonheaders.h"
+#include "database.h"
+
+extern struct DBHeader dbHeader;
+
+static INT_PTR EnumModuleNames(WPARAM wParam,LPARAM lParam);
+
+struct ModuleName {
+	char *name;
+	DWORD hash;
+	DWORD ofs;
+};
+static struct ModuleName *moduleName;
+static int moduleNameCount;
+
+int InitModuleNames(void)
+{
+	struct DBModuleName *dbmn;
+	DWORD ofsThis,ofsNext;
+	int nameLen;
+
+	moduleNameCount=0;
+	moduleName=NULL;
+	ofsThis=dbHeader.ofsFirstModuleName;
+	dbmn=(struct DBModuleName*)DBRead(ofsThis,sizeof(struct DBModuleName),NULL);
+	while(ofsThis) {
+		if(dbmn->signature!=DBMODULENAME_SIGNATURE) DatabaseCorruption();
+		moduleName=(struct ModuleName*)mir_realloc(moduleName,sizeof(struct ModuleName)*(moduleNameCount+1));
+		moduleName[moduleNameCount].ofs=ofsThis;
+		moduleName[moduleNameCount].hash=dbmn->cbName;    //very very simple hash so far
+		moduleName[moduleNameCount].name=(char*)mir_alloc(dbmn->cbName+1);
+		ofsNext=dbmn->ofsNext;
+		nameLen=dbmn->cbName;
+		CopyMemory(moduleName[moduleNameCount].name,DBRead(ofsThis+offsetof(struct DBModuleName,name),nameLen,NULL),nameLen);
+		moduleName[moduleNameCount].name[nameLen]=0;
+		moduleNameCount++;
+		ofsThis=ofsNext;
+		dbmn=(struct DBModuleName*)DBRead(ofsThis,sizeof(struct DBModuleName),NULL);
+	}
+	CreateServiceFunction(MS_DB_MODULES_ENUM,EnumModuleNames);
+	return 0;
+}
+
+void UninitModuleNames(void)
+{
+	int i;
+	for(i=0;i<moduleNameCount;i++) mir_free(moduleName[i].name);
+	if(moduleNameCount) mir_free(moduleName);
+}
+
+static DWORD FindExistingModuleNameOfs(const char *szName,int nameLen)
+{
+	int i;
+	for(i=0;i<moduleNameCount;i++)
+		if(moduleName[i].hash==(DWORD)nameLen && !strcmp(moduleName[i].name,szName)) return moduleName[i].ofs;
+	return 0;
+}
+
+//will create the offset if it needs to
+DWORD GetModuleNameOfs(const char *szName)
+{
+	struct DBModuleName dbmn;
+	int nameLen=(int)strlen(szName);
+	DWORD ofsNew,ofsExisting;
+
+	ofsExisting=FindExistingModuleNameOfs(szName,nameLen);
+	if(ofsExisting) return ofsExisting;
+	//need to create the module name
+	ofsNew=CreateNewSpace(nameLen+offsetof(struct DBModuleName,name));
+	dbmn.signature=DBMODULENAME_SIGNATURE;
+	dbmn.cbName=nameLen;
+	dbmn.ofsNext=dbHeader.ofsFirstModuleName;
+	dbHeader.ofsFirstModuleName=ofsNew;
+	DBWrite(0,&dbHeader,sizeof(dbHeader));
+	DBWrite(ofsNew,&dbmn,offsetof(struct DBModuleName,name));
+	DBWrite(ofsNew+offsetof(struct DBModuleName,name),(PVOID)szName,nameLen);
+	DBFlush(0);
+	//add to cache
+	moduleName=(struct ModuleName*)mir_realloc(moduleName,sizeof(struct ModuleName)*(moduleNameCount+1));
+	moduleName[moduleNameCount].ofs=ofsNew;
+	moduleName[moduleNameCount].hash=nameLen;    //very very simple hash so far
+	moduleName[moduleNameCount].name=(char*)mir_alloc(nameLen+1);
+	strcpy(moduleName[moduleNameCount].name,szName);
+	moduleNameCount++;
+	//quit
+	return ofsNew;
+}
+
+//it's OK that this is a bit slow - it's rarely used
+char *GetModuleNameByOfs(DWORD ofs)
+{
+	int i;
+
+	for(i=0;i<moduleNameCount;i++)
+		if(moduleName[i].ofs==ofs) return moduleName[i].name;
+	DatabaseCorruption();
+	return NULL;
+} 
+
+static INT_PTR EnumModuleNames(WPARAM wParam,LPARAM lParam)
+{
+	int i;
+	INT_PTR ret;
+	for(i=0;i<moduleNameCount;i++) {
+		ret=((DBMODULEENUMPROC)lParam)(moduleName[i].name,moduleName[i].ofs,wParam);
+		if (ret) return ret;
+	}
+	return 0;
+}
-- 
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