| /* |
| * |
| * 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 flash.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 Base64 |
| { |
| private final static char alphabet[] = |
| { |
| 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
| 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', |
| 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
| 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', |
| 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
| 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', |
| 'w', 'x', 'y', 'z', '0', '1', '2', '3', |
| '4', '5', '6', '7', '8', '9', '+', '/' |
| }; |
| |
| private final static int inverse[] = |
| { |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63, |
| 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64, |
| 64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64, |
| 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, |
| 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, |
| 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64 |
| }; |
| |
| public static class Decoder |
| { |
| private int filled = 0; |
| private byte data[]; |
| private int count = 0; |
| private int work[] = { 0, 0, 0, 0 }; |
| |
| public Decoder() |
| { |
| data = new byte[256]; |
| } |
| |
| public void decode( String encoded ) |
| { |
| int estimate = 1 + encoded.length() * 3 / 4; |
| |
| 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 ) |
| { |
| char c = encoded.charAt(i); |
| |
| if ( c == '=' ) |
| work[count++] = -1; |
| else if ( inverse[c] != 64 ) |
| work[count++] = inverse[c]; |
| else |
| continue; |
| |
| if ( count == 4 ) |
| { |
| count = 0; |
| data[filled++] = (byte)((work[0] << 2) | ((work[1]&0xff) >> 4)); |
| |
| if ( work[2] == -1 ) |
| break; |
| |
| data[filled++] = (byte)((work[1] << 4) | ((work[2]&0xff) >> 2)); |
| |
| if ( work[3] == -1 ) |
| break; |
| |
| data[filled++] = (byte)((work[2] << 6) | work[3]); |
| } |
| |
| } |
| } |
| public byte[] drain() |
| { |
| byte[] r = new byte[filled]; |
| System.arraycopy( data, 0, r, 0, filled ); |
| filled = 0; |
| return r; |
| } |
| |
| public byte[] flush() throws IllegalStateException |
| { |
| if ( count > 0 ) |
| throw new IllegalStateException( "a partial block (" + count + " of 4 bytes) was dropped, decoded data is probably truncated!"); |
| return drain(); |
| } |
| |
| public void reset() |
| { |
| count = 0; |
| filled = 0; |
| } |
| |
| } |
| |
| |
| public static class Encoder |
| { |
| private int work[] = { 0, 0, 0 }; |
| private int count = 0; |
| private int line = 0; |
| private StringBuilder output; |
| private int wrap = 76; |
| |
| public Encoder( int size ) |
| { |
| output = new StringBuilder( size ); |
| } |
| |
| public Encoder( int size, int wrap ) |
| { |
| output = new StringBuilder( size ); |
| this.wrap = wrap; |
| } |
| |
| private void encodeBlock() |
| { |
| output.append( alphabet[(work[0] & 0xFF) >> 2] ); |
| output.append( alphabet[((work[0] & 0x03) << 4) | ((work[1] & 0xF0) >> 4)] ); |
| if ( count > 1 ) |
| output.append( alphabet[((work[1] & 0x0F) << 2) | ((work[2] & 0xC0) >> 6) ] ); |
| else |
| output.append( '=' ); |
| |
| if ( count > 2 ) |
| output.append( alphabet[work[2] & 0x3F] ); |
| else |
| output.append( '=' ); |
| |
| if ( (wrap != -1) && (( line += 4 ) == wrap )) |
| { |
| output.append( '\n' ); |
| line = 0; |
| } |
| } |
| |
| 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) ) |
| { |
| work[count] = data[plainIndex]; |
| count++; |
| |
| if ( count == work.length || ((offset + length) - plainIndex) == 1 ) |
| { |
| encodeBlock(); |
| count = 0; |
| work[0] = 0; |
| work[1] = 0; |
| work[2] = 0; |
| } |
| plainIndex++; |
| } |
| } |
| |
| public String drain() |
| { |
| String r = output.toString(); |
| output.setLength(0); |
| return r; |
| } |
| |
| public String flush() |
| { |
| if ( count > 0 ) |
| encodeBlock(); |
| |
| String r = drain(); |
| count = 0; |
| line = 0; |
| work[0] = 0; |
| work[1] = 0; |
| work[2] = 0; |
| return r; |
| } |
| |
| |
| } |
| |
| public static void main(String[] args) |
| { |
| boolean printData = false; |
| int randomLimit = 500; |
| |
| byte raw [] = new byte[(int)(Math.random() * randomLimit)]; |
| |
| for ( int i = 0; i < raw.length; ++i ) |
| { |
| if (( i % 1024 ) < 256 ) |
| raw[i] = (byte)(i % 1024); |
| else |
| raw[i] = (byte)((int)(Math.random() * 255) - 128); |
| } |
| Base64.Encoder encoder = new Base64.Encoder(100); |
| encoder.encode( raw ); |
| |
| String encoded = encoder.drain(); |
| |
| Base64.Decoder decoder = new Base64.Decoder(); |
| decoder.decode( encoded ); |
| byte check[] = decoder.flush(); |
| |
| String mesg = "Success!"; |
| if ( check.length != raw.length ) |
| { |
| mesg = "***** length mismatch!"; |
| } |
| else |
| { |
| for ( int i = 0; i < check.length; ++i ) |
| { |
| if ( check[i] != raw[i] ) |
| { |
| mesg = "***** data mismatch!"; |
| break; |
| } |
| } |
| } |
| System.out.println(mesg); |
| |
| if (printData) |
| { |
| System.out.println("Decoded: " + new String(raw)); |
| System.out.println("Encoded: " + encoded); |
| System.out.println("Decoded: " + new String(check)); |
| } |
| |
| /* |
| if (args.length==0) |
| { |
| System.err.println("Usage: java util.Base64 filename"); |
| System.exit(1); |
| } |
| |
| File f = new File( args[0] ); |
| URL url = FileUtils.toURL(f); |
| |
| InputStream in = url.openStream(); |
| Base64.Encoder enc = new Base64.Encoder(1024 * 4 / 3 + 2*1024/76); |
| |
| byte data [] = new byte[1024]; |
| while ( true ) |
| { |
| int len = in.read( data ); |
| if ( len == -1 ) |
| break; |
| enc.encode( data, 0, len ); |
| System.out.print( enc.drain() ); |
| |
| } |
| System.out.print( enc.flush() ); |
| */ |
| |
| } |
| } |