org.apache.commons.compress.utils

Class ByteUtils

java.lang.Object

org.apache.commons.compress.utils.ByteUtils

public final class ByteUtils
extends Object

Utility methods for reading and writing bytes.

Since:

1.14

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ByteUtils.ByteConsumer Used to consume bytes.
static interface	ByteUtils.ByteSupplier Used to supply bytes.
static class	ByteUtils.InputStreamByteSupplier ByteUtils.ByteSupplier based on InputStream.
static class	ByteUtils.OutputStreamByteConsumer ByteUtils.ByteConsumer based on OutputStream.

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	EMPTY_BYTE_ARRAY Empty array.

Method Summary

Modifier and Type	Method and Description
static long	fromLittleEndian(byte[] bytes) Reads the given byte array as a little endian long.
static long	fromLittleEndian(byte[] bytes, int off, int length) Reads the given byte array as a little endian long.
static long	fromLittleEndian(ByteUtils.ByteSupplier supplier, int length) Reads the given number of bytes from the given supplier as a little endian long.
static long	fromLittleEndian(DataInput in, int length) Reads the given number of bytes from the given input as little endian long.
static long	fromLittleEndian(InputStream in, int length) Reads the given number of bytes from the given stream as a little endian long.
static void	toLittleEndian(byte[] b, long value, int off, int length) Inserts the given value into the array as a little endian sequence of the given length starting at the given offset.
static void	toLittleEndian(ByteUtils.ByteConsumer consumer, long value, int length) Provides the given value to the given consumer as a little endian sequence of the given length.
static void	toLittleEndian(DataOutput out, long value, int length) Writes the given value to the given stream as a little endian array of the given length.
static void	toLittleEndian(OutputStream out, long value, int length) Writes the given value to the given stream as a little endian array of the given length.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_BYTE_ARRAY

public static final byte[] EMPTY_BYTE_ARRAY

Empty array.

Since:

1.21

Method Detail

fromLittleEndian

public static long fromLittleEndian(byte[] bytes)

Reads the given byte array as a little endian long.

Parameters:

bytes - the byte array to convert

Returns:

the number read

fromLittleEndian

public static long fromLittleEndian(byte[] bytes,
                                    int off,
                                    int length)

Reads the given byte array as a little endian long.

Parameters:

bytes - the byte array to convert

off - the offset into the array that starts the value

length - the number of bytes representing the value

Returns:

the number read

Throws:

IllegalArgumentException - if len is bigger than eight

fromLittleEndian

public static long fromLittleEndian(ByteUtils.ByteSupplier supplier,
                                    int length)
                             throws IOException

Reads the given number of bytes from the given supplier as a little endian long.

Typically used by our InputStreams that need to count the bytes read as well.

Parameters:

supplier - the supplier for bytes

length - the number of bytes representing the value

Returns:

the number read

Throws:

IllegalArgumentException - if len is bigger than eight

IOException - if the supplier fails or doesn't supply the given number of bytes anymore

fromLittleEndian

public static long fromLittleEndian(DataInput in,
                                    int length)
                             throws IOException

Reads the given number of bytes from the given input as little endian long.

Parameters:

in - the input to read from

length - the number of bytes representing the value

Returns:

the number read

Throws:

IllegalArgumentException - if len is bigger than eight

IOException - if reading fails or the stream doesn't contain the given number of bytes anymore

fromLittleEndian

public static long fromLittleEndian(InputStream in,
                                    int length)
                             throws IOException

Reads the given number of bytes from the given stream as a little endian long.

Parameters:

in - the stream to read from

length - the number of bytes representing the value

Returns:

the number read

Throws:

IllegalArgumentException - if len is bigger than eight

IOException - if reading fails or the stream doesn't contain the given number of bytes anymore

toLittleEndian

public static void toLittleEndian(byte[] b,
                                  long value,
                                  int off,
                                  int length)

Inserts the given value into the array as a little endian sequence of the given length starting at the given offset.

Parameters:

b - the array to write into

value - the value to insert

off - the offset into the array that receives the first byte

length - the number of bytes to use to represent the value

toLittleEndian

public static void toLittleEndian(ByteUtils.ByteConsumer consumer,
                                  long value,
                                  int length)
                           throws IOException

Provides the given value to the given consumer as a little endian sequence of the given length.

Parameters:

consumer - the consumer to provide the bytes to

value - the value to provide

length - the number of bytes to use to represent the value

Throws:

IOException - if writing fails

toLittleEndian

public static void toLittleEndian(DataOutput out,
                                  long value,
                                  int length)
                           throws IOException

Writes the given value to the given stream as a little endian array of the given length.

Parameters:

out - the output to write to

value - the value to write

length - the number of bytes to use to represent the value

Throws:

IOException - if writing fails

toLittleEndian

public static void toLittleEndian(OutputStream out,
                                  long value,
                                  int length)
                           throws IOException

Writes the given value to the given stream as a little endian array of the given length.

Parameters:

out - the stream to write to

value - the value to write

length - the number of bytes to use to represent the value

Throws:

IOException - if writing fails