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jruby/src/org/jruby/util/Adler32Ext.java at parallel_boot · MSNexploder/jruby · GitHub
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Adler32Ext.java
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jruby
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Adler32Ext.java
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/***** BEGIN LICENSE BLOCK *****
* Version: EPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package
org
.
jruby
.
util
;
import
java
.
lang
.
reflect
.
Field
;
import
java
.
util
.
zip
.
Adler32
;
import
java
.
util
.
zip
.
Checksum
;
/**
* This class is a wrapper around Adler32 which provides the capability to
* update the running total. This functionality is provided by quite risky
* reflection and should be fixed in a better way later on.
*/
public
class
Adler32Ext
implements
Checksum
{
private
int
adler
;
private
final
Adler32
intern
;
private
static
final
Field
intern_adler
;
static
{
try
{
intern_adler
=
Adler32
.
class
.
getDeclaredField
(
"adler"
);
intern_adler
.
setAccessible
(
true
);
}
catch
(
final
NoSuchFieldException
nsfe
) {
throw
new
RuntimeException
(
"This class have stopped working, it should be updated and FIXED now."
);
}
}
/**
* Creates the basic object with default initial adler.
*/
public
Adler32Ext
() {
this
(
1
);
}
/**
* Creates the basic object with the adler provided.
*
* @param adler the number to use as starting point for the Adler-32 algorithm
*/
public
Adler32Ext
(
final
int
adler
) {
super
();
this
.
adler
=
adler
;
this
.
intern
=
new
Adler32
();
setAdlerRef
(
this
.
adler
);
}
/**
* Sets the adler running total to the specified value.
*
* @param adler the number to use as current value for the Adler-32 algorithm
*/
public
void
setAdler
(
final
int
adler
) {
this
.
adler
=
adler
;
setAdlerRef
(
this
.
adler
);
}
/**
* @see java.util.zip.Checksum#update
*/
public
void
update
(
final
int
b
) {
this
.
intern
.
update
(
b
);
}
/**
* @see java.util.zip.Checksum#update
*/
public
void
update
(
final
byte
[]
b
,
final
int
off
,
final
int
len
) {
this
.
intern
.
update
(
b
,
off
,
len
);
}
/**
* @see java.util.zip.Checksum#update
*/
public
void
update
(
final
byte
[]
b
) {
this
.
intern
.
update
(
b
);
}
/**
* @see java.util.zip.Checksum#reset
*/
public
void
reset
() {
this
.
intern
.
reset
();
this
.
adler
=
1
;
}
/**
* @see java.util.zip.Checksum#getValue
*/
public
long
getValue
() {
return
this
.
intern
.
getValue
();
}
/**
* Helper method to set the reference through reflection.
*
* @param val the value to set.
*/
private
void
setAdlerRef
(
final
int
val
) {
try
{
intern_adler
.
setInt
(
intern
,
val
);
}
catch
(
final
IllegalAccessException
e
) {
throw
new
IllegalStateException
(
e
.
toString
());
}
}
}
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