com.google.zxing.common

类 BitSource

java.lang.Object

com.google.zxing.common.BitSource

public final class BitSource
extends java.lang.Object

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.

This class is thread-safe but not reentrant -- unless the caller modifies the bytes array it passed in, in which case all bets are off.

作者:

Sean Owen

构造器概要

构造器

构造器和说明
BitSource(byte[] bytes)

方法概要

限定符和类型	方法和说明
int	available()
int	getBitOffset()
int	getByteOffset()
int	readBits(int numBits)

从类继承的方法 java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

BitSource

public BitSource(byte[] bytes)

参数:

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.

方法详细资料

getBitOffset

public int getBitOffset()

返回:

index of next bit in current byte which would be read by the next call to readBits(int).

getByteOffset

public int getByteOffset()

返回:

index of next byte in input byte array which would be read by the next call to readBits(int).

readBits

public int readBits(int numBits)

参数:

numBits - number of bits to read

返回:

int representing the bits read. The bits will appear as the least-significant bits of the int

抛出:

java.lang.IllegalArgumentException - if numBits isn't in [1,32] or more than is available

available

public int available()

返回:

number of bits that can be read successfully