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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package sun.misc; | ||
| 26 | |||
| 27 | import java.io.InputStream; | ||
| 28 | import java.io.OutputStream; | ||
| 29 | import java.io.PrintStream; | ||
| 30 | import java.io.IOException; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This class implements a Berkeley uu character encoder. This encoder | ||
| 34 | * was made famous by uuencode program. | ||
| 35 | * | ||
| 36 | * The basic character coding is algorithmic, taking 6 bits of binary | ||
| 37 | * data and adding it to an ASCII ' ' (space) character. This converts | ||
| 38 | * these six bits into a printable representation. Note that it depends | ||
| 39 | * on the ASCII character encoding standard for english. Groups of three | ||
| 40 | * bytes are converted into 4 characters by treating the three bytes | ||
| 41 | * a four 6 bit groups, group 1 is byte 1's most significant six bits, | ||
| 42 | * group 2 is byte 1's least significant two bits plus byte 2's four | ||
| 43 | * most significant bits. etc. | ||
| 44 | * | ||
| 45 | * In this encoding, the buffer prefix is: | ||
| 46 | * <pre> | ||
| 47 | * begin [mode] [filename] | ||
| 48 | * </pre> | ||
| 49 | * | ||
| 50 | * This is followed by one or more lines of the form: | ||
| 51 | * <pre> | ||
| 52 | * (len)(data)(data)(data) ... | ||
| 53 | * </pre> | ||
| 54 | * where (len) is the number of bytes on this line. Note that groupings | ||
| 55 | * are always four characters, even if length is not a multiple of three | ||
| 56 | * bytes. When less than three characters are encoded, the values of the | ||
| 57 | * last remaining bytes is undefined and should be ignored. | ||
| 58 | * | ||
| 59 | * The last line of data in a uuencoded file is represented by a single | ||
| 60 | * space character. This is translated by the decoding engine to a line | ||
| 61 | * length of zero. This is immediately followed by a line which contains | ||
| 62 | * the word 'end[newline]' | ||
| 63 | * | ||
| 64 | * @author Chuck McManis | ||
| 65 | * @see CharacterEncoder | ||
| 66 | * @see UUDecoder | ||
| 67 | */ | ||
| 68 | public class UUEncoder extends CharacterEncoder { | ||
| 69 | |||
| 70 | /** | ||
| 71 | * This name is stored in the begin line. | ||
| 72 | */ | ||
| 73 | private String bufferName; | ||
| 74 | |||
| 75 | /** | ||
| 76 | * Represents UNIX(tm) mode bits. Generally three octal digits representing | ||
| 77 | * read, write, and execute permission of the owner, group owner, and | ||
| 78 | * others. They should be interpreted as the bit groups: | ||
| 79 | * (owner) (group) (others) | ||
| 80 | * rwx rwx rwx (r = read, w = write, x = execute) | ||
| 81 | * | ||
| 82 | * By default these are set to 644 (UNIX rw-r--r-- permissions). | ||
| 83 | */ | ||
| 84 | private int mode; | ||
| 85 | |||
| 86 | |||
| 87 | /** | ||
| 88 | * Default - buffer begin line will be: | ||
| 89 | * <pre> | ||
| 90 | * begin 644 encoder.buf | ||
| 91 | * </pre> | ||
| 92 | */ | ||
| 93 | public UUEncoder() { | ||
| 94 | bufferName = "encoder.buf"; | ||
| 95 | mode = 644; | ||
| 96 | } | ||
| 97 | |||
| 98 | /** | ||
| 99 | * Specifies a name for the encoded buffer, begin line will be: | ||
| 100 | * <pre> | ||
| 101 | * begin 644 [FNAME] | ||
| 102 | * </pre> | ||
| 103 | */ | ||
| 104 | public UUEncoder(String fname) { | ||
| 105 | bufferName = fname; | ||
| 106 | mode = 644; | ||
| 107 | } | ||
| 108 | |||
| 109 | /** | ||
| 110 | * Specifies a name and mode for the encoded buffer, begin line will be: | ||
| 111 | * <pre> | ||
| 112 | * begin [MODE] [FNAME] | ||
| 113 | * </pre> | ||
| 114 | */ | ||
| 115 | public UUEncoder(String fname, int newMode) { | ||
| 116 | bufferName = fname; | ||
| 117 | mode = newMode; | ||
| 118 | } | ||
| 119 | |||
| 120 | /** number of bytes per atom in uuencoding is 3 */ | ||
| 121 | protected int bytesPerAtom() { | ||
| 122 | return (3); | ||
| 123 | } | ||
| 124 | |||
| 125 | /** number of bytes per line in uuencoding is 45 */ | ||
| 126 | protected int bytesPerLine() { | ||
| 127 | return (45); | ||
| 128 | } | ||
| 129 | |||
| 130 | /** | ||
| 131 | * encodeAtom - take three bytes and encodes them into 4 characters | ||
| 132 | * If len is less than 3 then remaining bytes are filled with '1'. | ||
| 133 | * This insures that the last line won't end in spaces and potentiallly | ||
| 134 | * be truncated. | ||
| 135 | */ | ||
| 136 | protected void encodeAtom(OutputStream outStream, byte data[], int offset, int len) | ||
| 137 | throws IOException { | ||
| 138 | byte a, b = 1, c = 1; | ||
| 139 | int c1, c2, c3, c4; | ||
| 140 | |||
| 141 | a = data[offset]; | ||
| 142 | if (len > 1) { | ||
| 143 | b = data[offset+1]; | ||
| 144 | } | ||
| 145 | if (len > 2) { | ||
| 146 | c = data[offset+2]; | ||
| 147 | } | ||
| 148 | |||
| 149 | c1 = (a >>> 2) & 0x3f; | ||
| 150 | c2 = ((a << 4) & 0x30) | ((b >>> 4) & 0xf); | ||
| 151 | c3 = ((b << 2) & 0x3c) | ((c >>> 6) & 0x3); | ||
| 152 | c4 = c & 0x3f; | ||
| 153 | outStream.write(c1 + ' '); | ||
| 154 | outStream.write(c2 + ' '); | ||
| 155 | outStream.write(c3 + ' '); | ||
| 156 | outStream.write(c4 + ' '); | ||
| 157 | return; | ||
| 158 | } | ||
| 159 | |||
| 160 | /** | ||
| 161 | * Encode the line prefix which consists of the single character. The | ||
| 162 | * lenght is added to the value of ' ' (32 decimal) and printed. | ||
| 163 | */ | ||
| 164 | protected void encodeLinePrefix(OutputStream outStream, int length) | ||
| 165 | throws IOException { | ||
| 166 | outStream.write((length & 0x3f) + ' '); | ||
| 167 | } | ||
| 168 | |||
| 169 | |||
| 170 | /** | ||
| 171 | * The line suffix for uuencoded files is simply a new line. | ||
| 172 | */ | ||
| 173 | protected void encodeLineSuffix(OutputStream outStream) throws IOException { | ||
| 174 | pStream.println(); | ||
| 175 | } | ||
| 176 | |||
| 177 | /** | ||
| 178 | * encodeBufferPrefix writes the begin line to the output stream. | ||
| 179 | */ | ||
| 180 | protected void encodeBufferPrefix(OutputStream a) throws IOException { | ||
| 181 | super.pStream = new PrintStream(a); | ||
| 182 | super.pStream.print("begin "+mode+" "); | ||
| 183 | if (bufferName != null) { | ||
| 184 | super.pStream.println(bufferName); | ||
| 185 | } else { | ||
| 186 | super.pStream.println("encoder.bin"); | ||
| 187 | } | ||
| 188 | super.pStream.flush(); | ||
| 189 | } | ||
| 190 | |||
| 191 | /** | ||
| 192 | * encodeBufferSuffix writes the single line containing space (' ') and | ||
| 193 | * the line containing the word 'end' to the output stream. | ||
| 194 | */ | ||
| 195 | protected void encodeBufferSuffix(OutputStream a) throws IOException { | ||
| 196 | super.pStream.println(" \nend"); | ||
| 197 | super.pStream.flush(); | ||
| 198 | } | ||
| 199 | |||
| 200 | } | ||