| package org.eclipse.ui.wizards.datatransfer; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| |
| /** |
| * This utility class converts a passed byte array into a Base 64 encoded |
| * String according to the specification in RFC1521 section 5.2 |
| */ |
| /*package*/ class Base64Encoder { |
| private static final String mappings = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//$NON-NLS-1$ |
| private static final String filler = "=";//$NON-NLS-1$ |
| /** |
| * Answer a string representing the Base 64 encoded form of the passed |
| * byte array |
| * |
| * @return java.lang.String |
| * @param contents byte[] |
| */ |
| public static String encode(byte[] contents) { |
| StringBuffer result = new StringBuffer(); |
| |
| for (int i = 0; i < contents.length; i = i + 3) { |
| if (result.length() == 76) |
| result.append("\n\r");//$NON-NLS-1$ |
| |
| // output character 1 |
| result.append(mappings.charAt((contents[i] & 0xFC) >> 2)); |
| |
| // output character 2 |
| int c2 = (contents[i] & 0x03) << 4; |
| if (i + 1 >= contents.length) { |
| result.append(mappings.charAt(c2)); |
| result.append(filler); |
| result.append(filler); |
| return result.toString(); |
| } |
| |
| c2 |= ((contents[i + 1] & 0xF0) >> 4); |
| result.append(mappings.charAt(c2)); |
| |
| // output character 3 |
| int c3 = (contents[i + 1] & 0x0F) << 2; |
| if (i + 2 >= contents.length) { |
| result.append(mappings.charAt(c3)); |
| result.append(filler); |
| return result.toString(); |
| } |
| |
| c3 |= ((contents[i + 2] & 0xC0) >> 6); |
| result.append(mappings.charAt(c3)); |
| |
| // output character 4 |
| result.append(mappings.charAt(contents[i + 2] & 0x3F)); |
| } |
| |
| return result.toString(); |
| } |
| } |