diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/Base64Converter.java')
| -rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/Base64Converter.java | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/Base64Converter.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/Base64Converter.java new file mode 100644 index 00000000..5d60a145 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/Base64Converter.java @@ -0,0 +1,124 @@ +/* + * 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 org.apache.tools.ant.util; + +/** + * BASE 64 encoding of a String or an array of bytes. + * + * Based on RFC 1421. + * + **/ +public class Base64Converter { + + private static final int BYTE = 8; + private static final int WORD = 16; + private static final int BYTE_MASK = 0xFF; + private static final int POS_0_MASK = 0x0000003F; + private static final int POS_1_MASK = 0x00000FC0; + private static final int POS_1_SHIFT = 6; + private static final int POS_2_MASK = 0x0003F000; + private static final int POS_2_SHIFT = 12; + private static final int POS_3_MASK = 0x00FC0000; + private static final int POS_3_SHIFT = 18; + + + private static final char[] ALPHABET = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7 + 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15 + 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23 + 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31 + 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39 + 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47 + 'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55 + '4', '5', '6', '7', '8', '9', '+', '/'}; // 56 to 63 + + // CheckStyle:ConstantNameCheck OFF - bc + /** Provided for BC purposes */ + public static final char[] alphabet = ALPHABET; + // CheckStyle:ConstantNameCheck ON + + + /** + * Encode a string into base64 encoding. + * @param s the string to encode. + * @return the encoded string. + */ + public String encode(String s) { + return encode(s.getBytes()); + } + + /** + * Encode a byte array into base64 encoding. + * @param octetString the byte array to encode. + * @return the encoded string. + */ + public String encode(byte[] octetString) { + int bits24; + int bits6; + + // CheckStyle:MagicNumber OFF + char[] out = new char[((octetString.length - 1) / 3 + 1) * 4]; + // CheckStyle:MagicNumber ON + int outIndex = 0; + int i = 0; + + // CheckStyle:MagicNumber OFF + while ((i + 3) <= octetString.length) { + // CheckStyle:MagicNumber ON + // store the octets + bits24 = (octetString[i++] & BYTE_MASK) << WORD; + bits24 |= (octetString[i++] & BYTE_MASK) << BYTE; + bits24 |= octetString[i++] & BYTE_MASK; + + bits6 = (bits24 & POS_3_MASK) >> POS_3_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_2_MASK) >> POS_2_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_1_MASK) >> POS_1_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_0_MASK); + out[outIndex++] = ALPHABET[bits6]; + } + if (octetString.length - i == 2) { + // store the octets + bits24 = (octetString[i] & BYTE_MASK) << WORD; + bits24 |= (octetString[i + 1] & BYTE_MASK) << BYTE; + bits6 = (bits24 & POS_3_MASK) >> POS_3_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_2_MASK) >> POS_2_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_1_MASK) >> POS_1_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + + // padding + out[outIndex++] = '='; + } else if (octetString.length - i == 1) { + // store the octets + bits24 = (octetString[i] & BYTE_MASK) << WORD; + bits6 = (bits24 & POS_3_MASK) >> POS_3_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + bits6 = (bits24 & POS_2_MASK) >> POS_2_SHIFT; + out[outIndex++] = ALPHABET[bits6]; + + // padding + out[outIndex++] = '='; + out[outIndex++] = '='; + } + return new String(out); + } +} |