// TortoiseSVN - a Windows shell extension for easy version control

// Copyright (C) 2007-2009, 2020 - TortoiseSVN

// 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,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#include "stdafx.h"
#include "PackedDWORDInStream.h"

///////////////////////////////////////////////////////////////
//
// CPackedDWORDInStreamBase
//
///////////////////////////////////////////////////////////////

// construction: nothing to do here

CPackedDWORDInStreamBase::CPackedDWORDInStreamBase (CCacheFileInBuffer* buffer
                                                   , STREAM_INDEX index)
    : CBinaryInStreamBase (buffer, index)
    , lastValue (0)
    , count (0)
{
}

// data access

DWORD CPackedDWORDInStreamBase::InternalGetValue()
{
    DWORD result = GetByte();
    if (result < 0x80)
        return result;

    result -= 0x80;

    char shift = 7;
    for (;;)
    {
        DWORD c = GetByte();
        if (c < 0x80)
            return result + (c << shift);

        result += ((c - 0x80) << shift);
        shift += 7;
    }
}

// update members in this derived class as well

void CPackedDWORDInStreamBase::AutoOpen()
{
    CBinaryInStreamBase::AutoOpen();
    lastValue = 0;
    count = 0;
}

void CPackedDWORDInStreamBase::AutoClose()
{
    lastValue = 0;
    count = 0;
    CBinaryInStreamBase::AutoClose();
}

///////////////////////////////////////////////////////////////
//
// CPackedDWORDInStream
//
///////////////////////////////////////////////////////////////

// construction: nothing special to do

CPackedDWORDInStream::CPackedDWORDInStream ( CCacheFileInBuffer* buffer
                                           , STREAM_INDEX index)
    : TBase (buffer, index)
{
}