de.quippy.jflac.io

Class BitInputStream

java.lang.Object

de.quippy.jflac.io.BitInputStream

public class BitInputStream
extends Object

Bit-wide input stream.

Author:

kc7bfi

Constructor Summary

Constructors

Constructor and Description
BitInputStream(InputStream is) The constructor.

Method Summary

Methods

Modifier and Type	Method and Description
int	bitsLeftForByteAlignment() return the number of bits to read to align the byte.
int	getInputBytesUnconsumed() return the number of bytes left to read.
short	getReadCRC16() return the read CRC-16 value.
int	getTotalBytesRead() Total Blurbs read.
boolean	isConsumedByteAligned() Test if the Bit Stream consumed bits is byte aligned.
int	peekBitToInt(int val, int bit) peek at the next bit and add it to the input integer.
int	peekRawUInt(int bits) peek at bits into an unsigned integer without advancing the input stream.
int	readBit() read a single bit.
int	readBitToInt(int val) read a bit into an integer value.
long	readBitToLong(long val) read a bit into a long value.
void	readByteBlockAlignedNoCRC(byte[] val, int nvals) Read a block of bytes (aligned) without updating the CRC value.
int	readRawInt(int bits) read bits into a signed integer.
int	readRawIntLittleEndian() read bits into an unsigned little endian integer.
int	readRawUInt(int bits) read bits into an unsigned integer.
long	readRawULong(int bits) read bits into an unsigned long.
void	readRiceSignedBlock(int[] vals, int pos, int nvals, int parameter) Read a Rice Signal Block.
int	readUnaryUnsigned() Read and count the number of zero bits.
int	readUTF8Int(ByteData raw) read UTF8 integer.
long	readUTF8Long(ByteData raw) read UTF long.
void	reset() Reset the bit stream.
void	resetReadCRC16(short seed) Reset the read CRC-16 value.
void	skip(long skip)
void	skipBitsNoCRC(int bits) skip over bits in bit stream without updating CRC.

Methods inherited from class java.lang.Object

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

Constructor Detail

BitInputStream

public BitInputStream(InputStream is)

The constructor.

Parameters:

is - The InputStream to read bits from

Method Detail

skip

public void skip(long skip)
          throws IOException

Throws:

IOException

reset

public void reset()

Reset the bit stream.

resetReadCRC16

public void resetReadCRC16(short seed)

Reset the read CRC-16 value.

Parameters:

seed - The initial CRC-16 value

getReadCRC16

public short getReadCRC16()

return the read CRC-16 value.

Returns:

The read CRC-16 value

isConsumedByteAligned

public boolean isConsumedByteAligned()

Test if the Bit Stream consumed bits is byte aligned.

Returns:

True of bit stream consumed bits is byte aligned

bitsLeftForByteAlignment

public int bitsLeftForByteAlignment()

return the number of bits to read to align the byte.

Returns:

The number of bits to align the byte

getInputBytesUnconsumed

public int getInputBytesUnconsumed()

return the number of bytes left to read.

Returns:

The number of bytes left to read

skipBitsNoCRC

public void skipBitsNoCRC(int bits)
                   throws IOException

skip over bits in bit stream without updating CRC.

Parameters:

bits - Number of bits to skip

Throws:

IOException - Thrown if error reading from input stream

readBit

public int readBit()
            throws IOException

read a single bit.

Returns:

The bit

Throws:

IOException - Thrown if error reading input stream

readBitToInt

public int readBitToInt(int val)
                 throws IOException

read a bit into an integer value. The bits of the input integer are shifted left and the read bit is placed into bit 0.

Parameters:

val - The integer to shift and add read bit

Returns:

The updated integer value

Throws:

IOException - Thrown if error reading input stream

peekBitToInt

public int peekBitToInt(int val,
               int bit)
                 throws IOException

peek at the next bit and add it to the input integer. The bits of the input integer are shifted left and the read bit is placed into bit 0.

Parameters:

val - The input integer

bit - The bit to peek at

Returns:

The updated integer value

Throws:

IOException - Thrown if error reading input stream

readBitToLong

public long readBitToLong(long val)
                   throws IOException

read a bit into a long value. The bits of the input long are shifted left and the read bit is placed into bit 0.

Parameters:

val - The long to shift and add read bit

Returns:

The updated long value

Throws:

IOException - Thrown if error reading input stream

readRawUInt

public int readRawUInt(int bits)
                throws IOException

read bits into an unsigned integer.

Parameters:

bits - The number of bits to read

Returns:

The bits as an unsigned integer

Throws:

IOException - Thrown if error reading input stream

peekRawUInt

public int peekRawUInt(int bits)
                throws IOException

peek at bits into an unsigned integer without advancing the input stream.

Parameters:

bits - The number of bits to read

Returns:

The bits as an unsigned integer

Throws:

IOException - Thrown if error reading input stream

readRawInt

public int readRawInt(int bits)
               throws IOException

read bits into a signed integer.

Parameters:

bits - The number of bits to read

Returns:

The bits as a signed integer

Throws:

IOException - Thrown if error reading input stream

readRawULong

public long readRawULong(int bits)
                  throws IOException

read bits into an unsigned long.

Parameters:

bits - The number of bits to read

Returns:

The bits as an unsigned long

Throws:

IOException - Thrown if error reading input stream

readRawIntLittleEndian

public int readRawIntLittleEndian()
                           throws IOException

read bits into an unsigned little endian integer.

Returns:

The bits as an unsigned integer

Throws:

IOException - Thrown if error reading input stream

readByteBlockAlignedNoCRC

public void readByteBlockAlignedNoCRC(byte[] val,
                             int nvals)
                               throws IOException

Read a block of bytes (aligned) without updating the CRC value.

Parameters:

val - The array to receive the bytes. If null, no bytes are returned

nvals - The number of bytes to read

Throws:

IOException - Thrown if error reading input stream

readUnaryUnsigned

public int readUnaryUnsigned()
                      throws IOException

Read and count the number of zero bits.

Returns:

The number of zero bits read

Throws:

IOException - Thrown if error reading input stream

readRiceSignedBlock

public void readRiceSignedBlock(int[] vals,
                       int pos,
                       int nvals,
                       int parameter)
                         throws IOException

Read a Rice Signal Block.

Parameters:

vals - The values to be returned

pos - The starting position in the vals array

nvals - The number of values to return

parameter - The Rice parameter

Throws:

IOException - On read error

readUTF8Int

public int readUTF8Int(ByteData raw)
                throws IOException

read UTF8 integer. on return, if *val == 0xffffffff then the utf-8 sequence was invalid, but the return value will be true

Parameters:

raw - The raw bytes read (output). If null, no bytes are returned

Returns:

The integer read

Throws:

IOException - Thrown if error reading input stream

readUTF8Long

public long readUTF8Long(ByteData raw)
                  throws IOException

read UTF long. on return, if *val == 0xffffffffffffffff then the utf-8 sequence was invalid, but the return value will be true

Parameters:

raw - The raw bytes read (output). If null, no bytes are returned

Returns:

The long read

Throws:

IOException - Thrown if error reading input stream

getTotalBytesRead

public int getTotalBytesRead()

Total Blurbs read.

Returns:

Returns the total blurbs read.