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Contents
#ifndef __BIT_SOURCE_H__
#define __BIT_SOURCE_H__
/*
* BitSource.h
* zxing
*
* Copyright 2010 ZXing authors All rights reserved.
*
* 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.
*/
#include <zxing/common/Array.h>
namespace zxing {
/**
* <p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
* number of bits read is not often a multiple of 8.</p>
*
* <p>This class is not thread-safe.</p>
*
* @author srowen@google.com (Sean Owen)
* @author christian.brunschen@gmail.com (Christian Brunschen)
*/
class BitSource : public Counted {
typedef char byte;
private:
ArrayRef<byte> bytes_;
int byteOffset_;
int bitOffset_;
public:
/**
* @param bytes bytes from which this will read bits. Bits will be read from the first byte first.
* Bits are read within a byte from most-significant to least-significant bit.
*/
BitSource(ArrayRef<byte> &bytes) :
bytes_(bytes), byteOffset_(0), bitOffset_(0) {
}
int getBitOffset() {
return bitOffset_;
}
int getByteOffset() {
return byteOffset_;
}
/**
* @param numBits number of bits to read
* @return int representing the bits read. The bits will appear as the least-significant
* bits of the int
* @throws IllegalArgumentException if numBits isn't in [1,32]
*/
int readBits(int numBits);
/**
* @return number of bits that can be read successfully
*/
int available();
};
}
#endif // __BIT_SOURCE_H__
Version data entries
13 entries across 13 versions & 4 rubygems