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db++.h

/*
 * Copyright (c) 2003-2004 Apple Computer, Inc. All Rights Reserved.
 * 
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The 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.
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 * @APPLE_LICENSE_HEADER_END@
 */


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

#include <security_utilities/utilities.h>
#include <security_cdsa_utilities/cssmdata.h>
#include <security_utilities/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

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