org.archive.wayback.util

Class ByteOp

java.lang.Object

org.archive.wayback.util.ByteOp

public class ByteOp
extends Object

Byte oriented static methods. Likely a lot of overlap with apache- commons stuff - eventually should be reconciled.

Author:

brad

Field Summary

Fields

Modifier and Type	Field and Description
static int	BUFFER_SIZE Default buffer size for IO ops
static Charset	UTF8

Constructor Summary

Constructors

Constructor and Description
ByteOp()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	cmp(byte[] a, byte[] b) Compare two byte arrays
static byte[]	copy(byte[] src, int offset, int length) Create a new byte array with contents initialized to values from the argument byte array.
static void	copyStream(InputStream is, OutputStream os) Write all bytes from is to os.
static void	copyStream(InputStream is, OutputStream os, int size) Write all bytes from is to os.
static void	discardStream(InputStream is) throw away all bytes from stream argument
static void	discardStream(InputStream is, int size) throw away all bytes from stream argument
static long	discardStreamCount(InputStream is) throw away all bytes from stream argument, and count how many bytes were discarded before reaching the end of the stream.
static long	discardStreamCount(InputStream is, int size) throw away all bytes from stream argument, and count how many bytes were discarded before reaching the end of the stream.

Methods inherited from class java.lang.Object

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

Field Detail

BUFFER_SIZE

public static final int BUFFER_SIZE

Default buffer size for IO ops

See Also:

Constant Field Values

UTF8

public static final Charset UTF8

Constructor Detail

ByteOp

public ByteOp()

Method Detail

copy

public static byte[] copy(byte[] src,
          int offset,
          int length)

Create a new byte array with contents initialized to values from the argument byte array.

Parameters:

src - source byte array of initial values

offset - start offset to copy bytes

length - number of bytes to copy

Returns:

a new byte array of size length, containing values from src starting from offset in the src array.

cmp

public static boolean cmp(byte[] a,
          byte[] b)

Compare two byte arrays

Parameters:

a - byte array to compare

b - byte array to compare

Returns:

true if a and b have same length, and all the same values, false otherwise

discardStream

public static void discardStream(InputStream is)
                          throws IOException

throw away all bytes from stream argument

Parameters:

is - InputStream to read and discard

Throws:

IOException - when is throws one

discardStream

public static void discardStream(InputStream is,
                 int size)
                          throws IOException

throw away all bytes from stream argument

Parameters:

is - InputStream to read and discard

size - number of bytes to read at once from the stream

Throws:

IOException - when is throws one

discardStreamCount

public static long discardStreamCount(InputStream is)
                               throws IOException

throw away all bytes from stream argument, and count how many bytes were discarded before reaching the end of the stream.

Parameters:

is - InputStream to read and discard

Returns:

the number of bytes discarded

Throws:

IOException - when is throws one

discardStreamCount

public static long discardStreamCount(InputStream is,
                      int size)
                               throws IOException

throw away all bytes from stream argument, and count how many bytes were discarded before reaching the end of the stream.

Parameters:

is - InputStream to read and discard

size - number of bytes to read at once from the stream

Returns:

the number of bytes discarded

Throws:

IOException - when is throws one

copyStream

public static void copyStream(InputStream is,
              OutputStream os)
                       throws IOException

Write all bytes from is to os. Does not close either stream.

Parameters:

is - to copy bytes from

os - to copy bytes to

Throws:

IOException - for usual reasons

copyStream

public static void copyStream(InputStream is,
              OutputStream os,
              int size)
                       throws IOException

Write all bytes from is to os. Does not close either stream.

Parameters:

is - to copy bytes from

os - to copy bytes to

size - number of bytes to buffer between read and write operations

Throws:

IOException - for usual reasons