#include <xstream/config.h>
#include <xstream/digest.h>

#include "debug.h"

#if HAVE_LIBZ

//for adler32 and crc32
#include <zlib.h>


namespace xstream{
namespace digest{

	////////////////////////////////
	/////// Adler32 digest /////////
	////////////////////////////////
	
	static const size_t buffer_size = 4*1024;
	typedef unsigned long int uli;
	
	z_common::z_common()
		:common<uli>(buffer_size),_digest(0)
	{
		LOG("digest::z_common");
	}

	unsigned long int z_common::digest()
	{
		LOG("digest::z_common::digest");
		return _digest;
	}

	void z_common::reset_digest()
	{
		_digest=0;
	}

	void adler32::calculate_digest()
	{
		LOG("digest::adler32::calculate_digest");
		_digest = ::adler32(_digest, reinterpret_cast<Bytef*>(pbase()), taken());
		LOG("\tdigest = "<<_digest);
	}

	//////////////////////////////
	/////// CRC32 digest /////////
	//////////////////////////////
	

	void crc32::calculate_digest()
	{
		LOG("digest::crc32::calculate_digest");
		_digest = ::crc32(_digest, reinterpret_cast<Bytef*>(pbase()), taken());
		LOG("\tdigest = "<<_digest);
	}

	}//namespace digest
}//namespace xstream


#endif