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/*
* Chromaprint -- Audio fingerprinting toolkit
* Copyright (C) 2010 Lukas Lalinsky <lalinsky@gmail.com>
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/

#ifndef CHROMAPRINT_BIT_STRING_READER_H_
#define CHROMAPRINT_BIT_STRING_READER_H_

#include <stdint.h>
#include <string>
#include "debug.h"

namespace Chromaprint
{
class BitStringReader
{
public:
BitStringReader(const std::string &input) : m_value(input), m_buffer(0), m_buffer_size(0)
{
m_value_iter = m_value.begin();
}

uint32_t Read(int bits)
{
if (m_buffer_size < bits) {
if (m_value_iter != m_value.end()) {
m_buffer |= (unsigned char)(*m_value_iter++) << m_buffer_size;
m_buffer_size += 8;
}
}
uint32_t result = m_buffer & ((1 << bits) - 1);
m_buffer >>= bits;
m_buffer_size -= bits;
return result;
}

void Reset()
{
m_buffer = 0;
m_buffer_size = 0;
}

private:

std::string m_value;
std::string::iterator m_value_iter;
uint32_t m_buffer;
int m_buffer_size;
};

};

#endif

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