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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package flex.messaging.util;
/**
* Code to read and write Base64-encoded text.
* Fairly special-purpose, not quite ready for
* general streaming as they don't let you
* drain less than everything that is currently
* available.
*
*
*/
public class Hex
{
private static final char digits[] =
{
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
/**
*
*/
public static class Decoder
{
private int filled = 0;
private byte data[];
private int work[] = {0, 0};
public Decoder()
{
data = new byte[256];
}
public void decode(String encoded)
{
int estimate = 1 + encoded.length() / 2;
if (filled + estimate > data.length)
{
int length = data.length * 2;
while (length < filled + estimate)
{
length *= 2;
}
byte[] newdata = new byte[length];
System.arraycopy(data, 0, newdata, 0, filled);
data = newdata;
}
for (int i = 0; i < encoded.length(); ++i)
{
work[0] = Character.digit(encoded.charAt(i), 16);
i++;
work[1] = Character.digit(encoded.charAt(i), 16);
data[filled++] = (byte) (((work[0] << 4) | (work[1])) & 0xff);
}
}
public byte[] drain()
{
byte[] r = new byte[filled];
System.arraycopy(data, 0, r, 0, filled);
filled = 0;
return r;
}
public byte[] flush() throws IllegalStateException
{
return drain();
}
public void reset()
{
filled = 0;
}
}
/**
*
*/
public static class Encoder
{
private StringBuffer output;
public Encoder(int size)
{
output = new StringBuffer(size * 2);
}
private void encodeBlock(byte work)
{
output.append(digits[(work & 0xF0) >>> 4]);
output.append(digits[(work & 0x0F)]);
}
public void encode(byte[] data)
{
encode(data, 0, data.length);
}
public void encode(byte[] data, int offset, int length)
{
int plainIndex = offset;
while (plainIndex < (offset + length))
{
encodeBlock(data[plainIndex]);
plainIndex++;
}
}
public String drain()
{
String r = output.toString();
output.setLength(0);
return r;
}
public String flush()
{
return drain();
}
}
}
