db++.h   [plain text]

/*
 * Copyright (c) 2003 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */


//
// dbm++ - generic C++ layer interface to [n]dbm
//
#ifndef _H_DBMPP
#define _H_DBMPP

#include <Security/utilities.h>
#include <Security/cssmdata.h>
#include <Security/unix++.h>
#include <string>
#include <db.h>


namespace Security {
namespace UnixPlusPlus {


class UnixDb : public FileDesc {
public:
	UnixDb();
	UnixDb(const char *path, int flags = O_RDWR, int mode = 0666, DBTYPE type = DB_HASH);
	UnixDb(const std::string &path, int flags = O_RDWR, int mode = 0666, DBTYPE type = DB_HASH);
	
	virtual ~UnixDb();
		
	void open(const char *path, int flags = O_RDWR, int mode = 0666, DBTYPE type = DB_HASH);
	void open(const std::string &path, int flags = O_RDWR, int mode = 0666, DBTYPE type = DB_HASH);
	void close();

	bool get(const CssmData &key, CssmData &value, int flags = 0) const;
	bool get(const CssmData &key, CssmOwnedData &value, int flags = 0) const;
	bool put(const CssmData &key, const CssmData &value, int flags = 0);
	void erase(const CssmData &key, int flags = 0);
	void flush(int flags = 0);
	
	bool next(CssmData &key, CssmData &value, int flags = R_NEXT) const;
	bool first(CssmData &key, CssmData &value) const
		{ return next(key, value, R_FIRST); }
	
	operator bool () const
		{ return mDb; }
	
public:
	struct Data : public PodWrapper<Data, DBT> {
		template <class T>
		Data(const T &src)		{ DBT::data = src.data(); DBT::size = src.length(); }
		
		Data() { }
		Data(void *data, size_t length) { DBT::data = data; DBT::size = length; }
		Data(const DBT &dat)	{ DBT::data = dat.data; DBT::size = dat.size; }
		
		void *data() const		{ return DBT::data; }
		size_t length() const	{ return size; }
		operator bool () const	{ return DBT::data != NULL; }
		operator CssmData () const { return CssmData(data(), length()); }
	};

private:
	DB *mDb;
};


}	// end namespace UnixPlusPlus
}	// end namespace Security


#endif //_H_DBMPP