Deflate.cpp

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/*
    ------------------------------------------------------------------------------------
    LICENSE:
    ------------------------------------------------------------------------------------
    This file is part of EVEmu: EVE Online Server Emulator
    Copyright 2006 - 2021 The EVEmu Team
    For the latest information visit https://evemu.dev
    ------------------------------------------------------------------------------------
    This program is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License along with
    this program; if not, write to the Free Software Foundation, Inc., 59 Temple
    Place - Suite 330, Boston, MA 02111-1307, USA, or go to
    http://www.gnu.org/copyleft/lesser.txt.
    ------------------------------------------------------------------------------------
    Author:        Zhur
*/

#include "eve-core.h"

#include "utils/Deflate.h"

const uint8 DeflateHeaderByte = 0x78; //'x'

bool IsDeflated( const Buffer& data )
{
    return ( DeflateHeaderByte == data[0] );
}

bool DeflateData( Buffer& data )
{
    Buffer dataDeflated;
    if( !DeflateData( data, dataDeflated ) )
        return false;

    data = dataDeflated;
    return true;
}

bool DeflateData( const Buffer& input, Buffer& output )
{
    const Buffer::iterator<uint8> out = output.end<uint8>();

    size_t outputSize = compressBound( input.size() );
    output.ResizeAt( out, outputSize );

    int res = compress( &*out, (uLongf*)&outputSize, &input[0], input.size() );

    if( Z_OK == res )
    {
        output.ResizeAt( out, outputSize );
        return true;
    }
    else
    {
        output.ResizeAt( out, 0 );
        return false;
    }
}

bool InflateData( Buffer& data )
{
    Buffer dataInflated;
    if( !InflateData( data, dataInflated ) )
        return false;

    data = dataInflated;
    return true;
}

bool InflateData( const Buffer& input, Buffer& output )
{
    const Buffer::iterator<uint8> out = output.end<uint8>();

    size_t outputSize = 0;
    size_t sizeMultiplier = 0;

    int res = 0;
    do
    {
        outputSize = ( input.size() << ++sizeMultiplier );
        output.ResizeAt( out, outputSize );

        res = uncompress( &*out, (uLongf*)&outputSize, &input[0], input.size() );
    } while( Z_BUF_ERROR == res );

    if( Z_OK == res )
    {
        output.ResizeAt( out, outputSize );
        return true;
    }
    else
    {
        output.ResizeAt( out, 0 );
        return false;
    }
}