BitMagic-C++
src
bmgamma.h
Go to the documentation of this file.
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#ifndef BMGAMMAENC__H__INCLUDED__
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#define BMGAMMAENC__H__INCLUDED__
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/*
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Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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For more information please visit: http://bitmagic.io
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*/
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/*! \file bmgamma.h
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\brief Elias Gamma Utils used for compact serialization (internal)
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*/
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namespace
bm
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{
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/*!
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\defgroup gammacode Elias Gamma Code (internal)
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Elias Gamma Encoder
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@internal
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\ingroup bvserial
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*/
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/**
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Elias Gamma decoder
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\ingroup gammacode
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*/
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template
<
typename
T,
typename
TBitIO>
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class
gamma_decoder
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{
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public
:
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gamma_decoder
(TBitIO& bin) : bin_(bin)
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{}
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/**
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Start encoding sequence
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*/
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void
start
()
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{}
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/**
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Stop decoding sequence
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*/
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void
stop
()
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{}
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/**
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Decode word
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*/
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T
operator()
(
void
)
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{
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unsigned
l = bin_.eat_zero_bits();
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bin_.get_bit();
// get border bit
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T current = 0;
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for
(
unsigned
i = 0; i < l; ++i)
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{
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if
(bin_.get_bit())
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{
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current += 1 << i;
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}
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}
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current |= (1 << l);
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return
current;
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}
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private
:
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gamma_decoder
(
const
gamma_decoder
&);
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gamma_decoder
& operator=(
const
gamma_decoder
&);
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private
:
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TBitIO& bin_;
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};
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}
// bm
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#endif
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bm::gamma_decoder::gamma_decoder
gamma_decoder(TBitIO &bin)
Definition:
bmgamma.h:45
bm::gamma_decoder::stop
void stop()
Stop decoding sequence.
Definition:
bmgamma.h:57
bm::gamma_decoder::operator()
T operator()(void)
Decode word.
Definition:
bmgamma.h:63
bm::gamma_decoder::start
void start()
Start encoding sequence.
Definition:
bmgamma.h:51
bm::gamma_decoder
Elias Gamma decoder.
Definition:
encoding.h:334
bm
Definition:
bm.h:76
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