| /* |
| * 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(); |
| } |
| } |
| } |