com.qcloud.cos.utils

Class BinaryUtils

java.lang.Object

com.qcloud.cos.utils.BinaryUtils

public class BinaryUtils
extends Object

Utilities for encoding and decoding binary data to and from different forms.

Constructor Summary

Constructors

Constructor and Description
BinaryUtils()

Method Summary

Modifier and Type	Method and Description
static byte[]	copyAllBytesFrom(ByteBuffer bb) Returns a copy of all the bytes from the given ByteBuffer, from the beginning to the buffer's limit; or null if the input is null.
static byte[]	copyBytesFrom(ByteBuffer bb) Returns a copy of the bytes from the given ByteBuffer, ranging from the the buffer's current position to the buffer's limit; or null if the input is null.
static byte[]	fromBase64(String b64Data) Converts a Base64-encoded string to the original byte data.
static byte[]	fromHex(String hexData) Converts a Hex-encoded data string to the original byte data.
static String	toBase64(byte[] data) Converts byte data to a Base64-encoded string.
static String	toHex(byte[] data) Converts byte data to a Hex-encoded string in lower case.
static ByteArrayInputStream	toStream(ByteBuffer byteBuffer) Wraps a ByteBuffer in an InputStream.

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryUtils

public BinaryUtils()

Method Detail

toHex

public static String toHex(byte[] data)

Converts byte data to a Hex-encoded string in lower case.

Parameters:

data - data to hex encode.

Returns:

hex-encoded string.

fromHex

public static byte[] fromHex(String hexData)
                      throws org.apache.commons.codec.DecoderException

Converts a Hex-encoded data string to the original byte data.

Parameters:

hexData - hex-encoded data to decode.

Returns:

decoded data from the hex string.

Throws:

org.apache.commons.codec.DecoderException

toBase64

public static String toBase64(byte[] data)

Converts byte data to a Base64-encoded string.

Parameters:

data - data to Base64 encode.

Returns:

encoded Base64 string.

fromBase64

public static byte[] fromBase64(String b64Data)

Converts a Base64-encoded string to the original byte data.

Parameters:

b64Data - a Base64-encoded string to decode.

Returns:

bytes decoded from a Base64 string.

toStream

public static ByteArrayInputStream toStream(ByteBuffer byteBuffer)

Wraps a ByteBuffer in an InputStream. If the input byteBuffer is null, returns an empty stream.

Parameters:

byteBuffer - The ByteBuffer to wrap.

Returns:

An InputStream wrapping the ByteBuffer content.

copyAllBytesFrom

public static byte[] copyAllBytesFrom(ByteBuffer bb)

Returns a copy of all the bytes from the given ByteBuffer, from the beginning to the buffer's limit; or null if the input is null.

The internal states of the given byte buffer will be restored when this method completes execution.

When handling ByteBuffer from user's input, it's typical to call the copyBytesFrom(ByteBuffer) instead of copyAllBytesFrom(ByteBuffer) so as to account for the position of the input ByteBuffer. The opposite is typically true, however, when handling ByteBuffer from withint the unmarshallers of the low-level clients.

copyBytesFrom

public static byte[] copyBytesFrom(ByteBuffer bb)

Returns a copy of the bytes from the given ByteBuffer, ranging from the the buffer's current position to the buffer's limit; or null if the input is null.

The internal states of the given byte buffer will be restored when this method completes execution.

When handling ByteBuffer from user's input, it's typical to call the copyBytesFrom(ByteBuffer) instead of copyAllBytesFrom(ByteBuffer) so as to account for the position of the input ByteBuffer. The opposite is typically true, however, when handling ByteBuffer from withint the unmarshallers of the low-level clients.