uint128.cpp

来自「电驴的MAC源代码」· C++ 代码 · 共 208 行

//
// This file is part of the aMule Project.
//
// Copyright (c) 2008 Dévai Tamás (GonoszTopi) ( [e-mail] )
// Copyright (c) 2004-2008 Angel Vidal (Kry) ( [e-mail] )
// Copyright (c) 2004-2008 aMule Team ( [e-mail] / http://www.amule.org )
// Copyright (c) 2003 Barry Dunne (http://www.emule-project.net)
//
// Any parts of this program derived from the xMule, lMule or eMule project,
// or contributed by third-party developers are copyrighted by their
// respective authors.
//
// 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
//


// Note To Mods //
/*
Please do not change anything here and release it..
There is going to be a new forum created just for the Kademlia side of the client..
If you feel there is an error or a way to improve something, please
post it in the forum first and let us look at it.. If it is a real improvement,
it will be added to the offical client.. Changing something without knowing
what all it does can cause great harm to the network if released in mass form..
Any mod that changes anything within the Kademlia side will not be allowed to advertise
there client on the eMule forum..
*/

#include "UInt128.h"

#include "../../CryptoPP_Inc.h"
#include "../../ArchSpecific.h"


////////////////////////////////////////
using namespace Kademlia;
////////////////////////////////////////

CUInt128::CUInt128(const CUInt128 &value, uint32_t numBits) throw()
{
	// Copy the whole uint32s
	uint32_t numULONGs = numBits / 32;
	for (uint32_t i = 0; i < numULONGs; ++i) {
		m_data[i] = value.m_data[i];
	}

	// Copy the remaining bits
	for (uint32_t i = (32 * numULONGs); i < numBits; ++i) {
		SetBitNumber(i, value.GetBitNumber(i));
	}

	// Pad with random bytes (Not seeding based on time to allow multiple different ones to be created in quick succession)
	for (uint32_t i = numBits; i < 128; ++i) {
		SetBitNumber(i, (rand() % 2));
	}
}

CUInt128& CUInt128::SetValueBE(const uint8_t *valueBE) throw()
{
	m_data[0] = wxUINT32_SWAP_ON_LE(RawPeekUInt32(valueBE+0));
	m_data[1] = wxUINT32_SWAP_ON_LE(RawPeekUInt32(valueBE+4));
	m_data[2] = wxUINT32_SWAP_ON_LE(RawPeekUInt32(valueBE+8));
	m_data[3] = wxUINT32_SWAP_ON_LE(RawPeekUInt32(valueBE+12));
	return *this;
}

CUInt128& CUInt128::SetValueRandom()
{
	CryptoPP::AutoSeededRandomPool rng;
	uint8_t randomBytes[16];
	rng.GenerateBlock(randomBytes, 16);
	SetValueBE(randomBytes);
	return *this;
}

wxString CUInt128::ToHexString() const
{
	wxString str;

	for (int i = 0; i < 4; ++i)
		str.Append(wxString::Format(wxT("%08X"), m_data[i]));

	return str;
}

wxString CUInt128::ToBinaryString(bool trim) const
{
	wxString str;
	int b;
	for (int i = 0; i < 128; ++i) {
		b = GetBitNumber(i);
		if ((!trim) || (b != 0)) {
			str.Append(wxString::Format(wxT("%d"), b));
			trim = false;
		}
	}
	if (str.Len() == 0) {
		str = wxT("0");
	}
	return str;
}

void CUInt128::ToByteArray(uint8_t *b) const throw()
{
	wxASSERT(b != NULL);

	RawPokeUInt32(b,      wxUINT32_SWAP_ON_LE(m_data[0]));
	RawPokeUInt32(b + 4,  wxUINT32_SWAP_ON_LE(m_data[1]));
	RawPokeUInt32(b + 8,  wxUINT32_SWAP_ON_LE(m_data[2]));
	RawPokeUInt32(b + 12, wxUINT32_SWAP_ON_LE(m_data[3]));
}

void CUInt128::StoreCryptValue(uint8_t *buf) const throw()
{
	wxASSERT(buf != NULL);

	RawPokeUInt32(buf,      wxUINT32_SWAP_ON_BE(m_data[0]));
	RawPokeUInt32(buf + 4,  wxUINT32_SWAP_ON_BE(m_data[1]));
	RawPokeUInt32(buf + 8,  wxUINT32_SWAP_ON_BE(m_data[2]));
	RawPokeUInt32(buf + 12, wxUINT32_SWAP_ON_BE(m_data[3]));
}

int CUInt128::CompareTo(const CUInt128 &other) const throw()
{
	for (int i = 0; i < 4; ++i) {
	    if (m_data[i] < other.m_data[i])
			return -1;
	    if (m_data[i] > other.m_data[i])
			return 1;
	}
	return 0;
}

int CUInt128::CompareTo(uint32_t value) const throw()
{
	if ((m_data[0] > 0) || (m_data[1] > 0) || (m_data[2] > 0) || (m_data[3] > value))
		return 1;
	if (m_data[3] < value)
		return -1;
	return 0;
}

CUInt128& CUInt128::Add(const CUInt128 &value) throw()
{
	if (value.IsZero()) return *this;

	int64_t sum = 0;
	for (int i = 3; i >= 0; i--) {
		sum += m_data[i];
		sum += value.m_data[i];
		m_data[i] = (uint32_t)sum;
		sum >>= 32;
	}
	return *this;
}

CUInt128& CUInt128::Subtract(const CUInt128 &value) throw()
{
	if (value.IsZero()) return *this;

	int64_t sum = 0;
	for (int i = 3; i >= 0; i--) {
		sum += m_data[i];
		sum -= value.m_data[i];
		m_data[i] = (uint32_t)sum;
		sum >>= 32;
	}
	return *this;
}

CUInt128& CUInt128::ShiftLeft(unsigned bits) throw()
{
	if ((bits == 0) || IsZero())
		return *this;

	if (bits > 127) {
		SetValue((uint32_t)0);
		return *this;
	}

	uint32_t result[] = {0,0,0,0};
	int indexShift = (int)bits / 32;
	int64_t shifted = 0;
	for (int i = 3; i >= indexShift; i--)
	{
		shifted += ((int64_t)m_data[i]) << (bits % 32);
		result[i-indexShift] = (uint32_t)shifted;
		shifted = shifted >> 32;
	}
	for (int i = 0; i < 4; ++i)
		m_data[i] = result[i];

	return *this;
}
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