#ifndef _DESHA1_HPP
#define _DESHA1_HPP
/*-------------------------------------------------------------------------
 * drawElements C++ Base Library
 * -----------------------------
 *
 * Copyright 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief SHA1 hash functions
 *//*--------------------------------------------------------------------*/

#include "deDefs.hpp"

#include "deSha1.h"

#include <string>
#include <vector>

namespace de
{

class Sha1
{
public:
				Sha1		(const deSha1& hash) : m_hash(hash) {}

	static Sha1	parse		(const std::string& str);
	static Sha1	compute		(size_t size, const void* data);

	bool		operator==	(const Sha1& other) const { return deSha1_equal(&m_hash, &other.m_hash) == DE_TRUE; }
	bool		operator!=	(const Sha1& other) const { return !(*this == other); }

private:
	deSha1		m_hash;
};

class Sha1Stream
{
public:
					Sha1Stream	(void);
	void			process		(size_t size, const void* data);
	Sha1			finalize	(void);

private:
	deSha1Stream	m_stream;
};

// Utility functions for building hash from values.
// \note This is not same as serializing the values and computing hash from the data.
//       Some extra care is required when dealing with types that have platform
//       specific size.
//       All vectors and strings will include their size in the hash. Following codes
//       produce different results:
//           stream << "Hi" << "Hello";
//       and
//           stream << "HiHello";

inline Sha1Stream& operator<< (Sha1Stream& stream, bool b)
{
	const deUint8 value = b ? 1 : 0;
	stream.process(sizeof(value), &value);
	return stream;
}

inline Sha1Stream& operator<< (Sha1Stream& stream, deUint32 value)
{
	const deUint8 data[] =
	{
		(deUint8)(0xFFu & (value >> 24)),
		(deUint8)(0xFFu & (value >> 16)),
		(deUint8)(0xFFu & (value >> 8)),
		(deUint8)(0xFFu & (value >> 0))
	};

	stream.process(sizeof(data), data);
	return stream;
}

inline Sha1Stream& operator<< (Sha1Stream& stream, deInt32 value)
{
	return stream << (deUint32)value;
}

inline Sha1Stream& operator<< (Sha1Stream& stream, deUint64 value)
{
	const deUint8 data[] =
	{
		(deUint8)(0xFFull & (value >> 56)),
		(deUint8)(0xFFull & (value >> 48)),
		(deUint8)(0xFFull & (value >> 40)),
		(deUint8)(0xFFull & (value >> 32)),
		(deUint8)(0xFFull & (value >> 24)),
		(deUint8)(0xFFull & (value >> 16)),
		(deUint8)(0xFFull & (value >> 8)),
		(deUint8)(0xFFull & (value >> 0))
	};

	stream.process(sizeof(data), data);
	return stream;
}

inline Sha1Stream& operator<< (Sha1Stream& stream, deInt64 value)
{
	return stream << (deUint64)value;
}

template<typename T>
inline Sha1Stream& operator<< (Sha1Stream& stream, const std::vector<T>& values)
{
	stream << (deUint64)values.size();

	for (size_t ndx = 0; ndx < values.size(); ndx++)
		stream << values[ndx];

	return stream;
}

inline Sha1Stream& operator<< (Sha1Stream& stream, const std::string& str)
{
	stream << (deUint64)str.size();
	stream.process(str.size(), str.c_str());
	return stream;
}

} // de

#endif // _DESHA1_HPP