builder.cc

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00001 ///
00002 /// \file       builder.cc
00003 ///             Virtual protocol packet builder wrapper
00004 ///
00005 
00006 /*
00007     Copyright (C) 2005-2012, Net Direct Inc. (http://www.netdirect.ca/)
00008 
00009     This program is free software; you can redistribute it and/or modify
00010     it under the terms of the GNU General Public License as published by
00011     the Free Software Foundation; either version 2 of the License, or
00012     (at your option) any later version.
00013 
00014     This program is distributed in the hope that it will be useful,
00015     but WITHOUT ANY WARRANTY; without even the implied warranty of
00016     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00017 
00018     See the GNU General Public License in the COPYING file at the
00019     root directory of this project for more details.
00020 */
00021 
00022 #include "builder.h"
00023 #include <stdexcept>
00024 #include <string.h>
00025 
00026 namespace Barry {
00027 
00028 //////////////////////////////////////////////////////////////////////////////
00029 // DBDataBuilder class
00030 
00031 
00032 DBDataBuilder::DBDataBuilder(const DBData &orig)
00033         : m_orig(orig)
00034 {
00035 }
00036 
00037 DBDataBuilder::~DBDataBuilder()
00038 {
00039 }
00040 
00041 bool DBDataBuilder::BuildRecord(DBData &data, size_t &offset,
00042                                 const IConverter *ic)
00043 {
00044         if( offset == m_orig.GetOffset() ) {
00045                 data = m_orig;
00046         }
00047         else {
00048                 // copy the metadata
00049                 data.CopyMeta(m_orig);
00050 
00051                 // copy the buffer, to the new offset
00052                 if( m_orig.GetOffset() > m_orig.GetData().GetSize() )
00053                         throw std::logic_error("DBDataBuilder: offset greater than size");
00054                 size_t actual = m_orig.GetData().GetSize() - m_orig.GetOffset();
00055                 size_t total = offset + actual;
00056                 unsigned char *buf = data.UseData().GetBuffer(total);
00057                 memcpy(buf + offset,
00058                         m_orig.GetData().GetData() + m_orig.GetOffset(),
00059                         actual);
00060                 data.UseData().ReleaseBuffer(total);
00061 
00062                 // set the new offset
00063                 data.SetOffset(offset);
00064         }
00065         return true;
00066 }
00067 
00068 bool DBDataBuilder::FetchRecord(DBData &data, const IConverter *ic)
00069 {
00070         data = m_orig;
00071         return true;
00072 }
00073 
00074 bool DBDataBuilder::EndOfFile() const
00075 {
00076         return true;
00077 }
00078 
00079 } // namespace Barry
00080 
00081