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

// Copyright (C) 2007-2009, 2014-2015, 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 "PackedTime64OutStream.h"

///////////////////////////////////////////////////////////////
//
// CPackedTime64OutStreamBase
//
///////////////////////////////////////////////////////////////

// add data to the stream

void CPackedTime64OutStreamBase::Add (__time64_t value)
{
    // store only diffs

    __time64_t temp = value;
    value -= lastValue;
    lastValue = temp;

    // extract the sign

    unsigned char head = 0;
    if (value < 0)
    {
        value = -value;
        head = 0x80;
    }

    // store bits 0 .. 3 in the header

    head += (unsigned char)value & 0xf;
    value >>= 4;

    // set buffer and determine size (min. 1)

    unsigned char buf[9] = { 0 };
    *reinterpret_cast<__time64_t*>(&buf[1]) = value;

    size_t size = 8;
    while ((buf[size] == 0) && (size > 1))
        --size;

    // store size in header and prepend header to buffer

    head += (unsigned char)((size-1) * 0x10);
    buf[0] = head;

    // write buffer to stream

    CBinaryOutStreamBase::Add (buf, size+1);
}

// construction: nothing special to do

CPackedTime64OutStreamBase::CPackedTime64OutStreamBase ( CCacheFileOutBuffer* aBuffer
                                                       , SUB_STREAM_ID anID)
    : CBinaryOutStreamBase (aBuffer, anID)
    , lastValue (0)
{
}

///////////////////////////////////////////////////////////////
//
// CPackedTime64OutStream
//
///////////////////////////////////////////////////////////////

// construction: nothing special to do

CPackedTime64OutStream::CPackedTime64OutStream ( CCacheFileOutBuffer* aBuffer
                                               , SUB_STREAM_ID anID)
    : TBase (aBuffer, anID)
{
}