lerc-sys 0.1.5

Low-level FFI bindings to Esri's LERC C API
Documentation 
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/*
Copyright 2015 - 2022 Esri

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.

A local copy of the license and additional notices are located with the
source distribution at:

http://github.com/Esri/lerc/

Contributors:  Thomas Maurer
*/

#ifndef BITSTUFFER_H
#define BITSTUFFER_H


#include <vector>
#include "../Defines.h"

NAMESPACE_LERC_START

/** Bit stuffer, for reading unsigned int arrays compressed lossless in the oldest Lerc1 version
*
*/

class BitStuffer
{
public:
  BitStuffer()  {}
  virtual ~BitStuffer()  {}

  bool read(const Byte** ppByte, std::vector<unsigned int>& dataVec) const;

protected:
  mutable std::vector<unsigned int>  m_tmpBitStuffVec;

  static bool readUInt(const Byte** ppByte, unsigned int& k, int numBytes);    // numBytes = 1, 2, or 4
  static unsigned int numTailBytesNotNeeded(unsigned int numElem, int numBits);
};

NAMESPACE_LERC_END
#endif