org.eclipse.jgit.storage.pack
Class BinaryDelta

java.lang.Object
  org.eclipse.jgit.storage.pack.BinaryDelta

public class BinaryDelta
extends Object

Recreate a stream from a base stream and a GIT pack delta.

This entire class is heavily cribbed from patch-delta.c in the GIT project. The original delta patching code was written by Nicolas Pitre (<nico@cam.org>).

Constructor Summary

BinaryDelta()

Method Summary

static byte[]	apply(byte[] base, byte[] delta) Apply the changes defined by delta to the data in base, yielding a new array of bytes.
static byte[]	apply(byte[] base, byte[] delta, byte[] result) Apply the changes defined by delta to the data in base, yielding a new array of bytes.
static String	format(byte[] delta) Format this delta as a human readable string.
static String	format(byte[] delta, boolean includeHeader) Format this delta as a human readable string.
static long	getBaseSize(byte[] delta) Length of the base object in the delta stream.
static long	getResultSize(byte[] delta) Length of the resulting object in the delta stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryDelta

public BinaryDelta()

Method Detail

getBaseSize

public static long getBaseSize(byte[] delta)

Length of the base object in the delta stream.

Parameters:

delta - the delta stream, or at least the header of it.

Returns:

the base object's size.

getResultSize

public static long getResultSize(byte[] delta)

Length of the resulting object in the delta stream.

Parameters:

delta - the delta stream, or at least the header of it.

Returns:

the resulting object's size.

apply

public static final byte[] apply(byte[] base,
                                 byte[] delta)

Apply the changes defined by delta to the data in base, yielding a new array of bytes.

Parameters:

base - some byte representing an object of some kind.

delta - a git pack delta defining the transform from one version to another.

Returns:

patched base

apply

public static final byte[] apply(byte[] base,
                                 byte[] delta,
                                 byte[] result)

Apply the changes defined by delta to the data in base, yielding a new array of bytes.

Parameters:

base - some byte representing an object of some kind.

delta - a git pack delta defining the transform from one version to another.

result - array to store the result into. If null the result will be allocated and returned.

Returns:

either result, or the result array allocated.

format

public static String format(byte[] delta)

Format this delta as a human readable string.

Parameters:

delta - the delta instruction sequence to format.

Returns:

the formatted delta.

format

public static String format(byte[] delta,
                            boolean includeHeader)

Format this delta as a human readable string.

Parameters:

delta - the delta instruction sequence to format.

includeHeader - true if the header (base size and result size) should be included in the formatting.

Returns:

the formatted delta.