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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 2001, 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.PushbackInputStream; | |
| 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 decoder. This decoder | |
| 34 | + * was made famous by the uudecode 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 buffer 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 | + * If an error is encountered during decoding this class throws a | |
| 65 | + * CEFormatException. The specific detail messages are: | |
| 66 | + * | |
| 67 | + * <pre> | |
| 68 | + * "UUDecoder: No begin line." | |
| 69 | + * "UUDecoder: Malformed begin line." | |
| 70 | + * "UUDecoder: Short Buffer." | |
| 71 | + * "UUDecoder: Bad Line Length." | |
| 72 | + * "UUDecoder: Missing 'end' line." | |
| 73 | + * </pre> | |
| 74 | + * | |
| 75 | + * @author Chuck McManis | |
| 76 | + * @see CharacterDecoder | |
| 77 | + * @see UUEncoder | |
| 78 | + */ | |
| 79 | +public class UUDecoder extends CharacterDecoder { | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * This string contains the name that was in the buffer being decoded. | |
| 83 | + */ | |
| 84 | + public String bufferName; | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Represents UNIX(tm) mode bits. Generally three octal digits | |
| 88 | + * representing read, write, and execute permission of the owner, | |
| 89 | + * group owner, and others. They should be interpreted as the bit groups: | |
| 90 | + * <pre> | |
| 91 | + * (owner) (group) (others) | |
| 92 | + * rwx rwx rwx (r = read, w = write, x = execute) | |
| 93 | + *</pre> | |
| 94 | + * | |
| 95 | + */ | |
| 96 | + public int mode; | |
| 97 | + | |
| 98 | + | |
| 99 | + /** | |
| 100 | + * UU encoding specifies 3 bytes per atom. | |
| 101 | + */ | |
| 102 | + protected int bytesPerAtom() { | |
| 103 | + return (3); | |
| 104 | + } | |
| 105 | + | |
| 106 | + /** | |
| 107 | + * All UU lines have 45 bytes on them, for line length of 15*4+1 or 61 | |
| 108 | + * characters per line. | |
| 109 | + */ | |
| 110 | + protected int bytesPerLine() { | |
| 111 | + return (45); | |
| 112 | + } | |
| 113 | + | |
| 114 | + /** This is used to decode the atoms */ | |
| 115 | + private byte decoderBuffer[] = new byte[4]; | |
| 116 | + | |
| 117 | + /** | |
| 118 | + * Decode a UU atom. Note that if l is less than 3 we don't write | |
| 119 | + * the extra bits, however the encoder always encodes 4 character | |
| 120 | + * groups even when they are not needed. | |
| 121 | + */ | |
| 122 | + protected void decodeAtom(PushbackInputStream inStream, OutputStream outStream, int l) | |
| 123 | + throws IOException { | |
| 124 | + int i, c1, c2, c3, c4; | |
| 125 | + int a, b, c; | |
| 126 | + StringBuffer x = new StringBuffer(); | |
| 127 | + | |
| 128 | + for (i = 0; i < 4; i++) { | |
| 129 | + c1 = inStream.read(); | |
| 130 | + if (c1 == -1) { | |
| 131 | + throw new CEStreamExhausted(); | |
| 132 | + } | |
| 133 | + x.append((char)c1); | |
| 134 | + decoderBuffer[i] = (byte) ((c1 - ' ') & 0x3f); | |
| 135 | + } | |
| 136 | + a = ((decoderBuffer[0] << 2) & 0xfc) | ((decoderBuffer[1] >>> 4) & 3); | |
| 137 | + b = ((decoderBuffer[1] << 4) & 0xf0) | ((decoderBuffer[2] >>> 2) & 0xf); | |
| 138 | + c = ((decoderBuffer[2] << 6) & 0xc0) | (decoderBuffer[3] & 0x3f); | |
| 139 | + outStream.write((byte)(a & 0xff)); | |
| 140 | + if (l > 1) { | |
| 141 | + outStream.write((byte)( b & 0xff)); | |
| 142 | + } | |
| 143 | + if (l > 2) { | |
| 144 | + outStream.write((byte)(c&0xff)); | |
| 145 | + } | |
| 146 | + } | |
| 147 | + | |
| 148 | + /** | |
| 149 | + * For uuencoded buffers, the data begins with a line of the form: | |
| 150 | + * begin MODE FILENAME | |
| 151 | + * This line always starts in column 1. | |
| 152 | + */ | |
| 153 | + protected void decodeBufferPrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException { | |
| 154 | + int c; | |
| 155 | + StringBuffer q = new StringBuffer(32); | |
| 156 | + String r; | |
| 157 | + boolean sawNewLine; | |
| 158 | + | |
| 159 | + /* | |
| 160 | + * This works by ripping through the buffer until it finds a 'begin' | |
| 161 | + * line or the end of the buffer. | |
| 162 | + */ | |
| 163 | + sawNewLine = true; | |
| 164 | + while (true) { | |
| 165 | + c = inStream.read(); | |
| 166 | + if (c == -1) { | |
| 167 | + throw new CEFormatException("UUDecoder: No begin line."); | |
| 168 | + } | |
| 169 | + if ((c == 'b') && sawNewLine){ | |
| 170 | + c = inStream.read(); | |
| 171 | + if (c == 'e') { | |
| 172 | + break; | |
| 173 | + } | |
| 174 | + } | |
| 175 | + sawNewLine = (c == '\n') || (c == '\r'); | |
| 176 | + } | |
| 177 | + | |
| 178 | + /* | |
| 179 | + * Now we think its begin, (we've seen ^be) so verify it here. | |
| 180 | + */ | |
| 181 | + while ((c != '\n') && (c != '\r')) { | |
| 182 | + c = inStream.read(); | |
| 183 | + if (c == -1) { | |
| 184 | + throw new CEFormatException("UUDecoder: No begin line."); | |
| 185 | + } | |
| 186 | + if ((c != '\n') && (c != '\r')) { | |
| 187 | + q.append((char)c); | |
| 188 | + } | |
| 189 | + } | |
| 190 | + r = q.toString(); | |
| 191 | + if (r.indexOf(' ') != 3) { | |
| 192 | + throw new CEFormatException("UUDecoder: Malformed begin line."); | |
| 193 | + } | |
| 194 | + mode = Integer.parseInt(r.substring(4,7)); | |
| 195 | + bufferName = r.substring(r.indexOf(' ',6)+1); | |
| 196 | + /* | |
| 197 | + * Check for \n after \r | |
| 198 | + */ | |
| 199 | + if (c == '\r') { | |
| 200 | + c = inStream.read (); | |
| 201 | + if ((c != '\n') && (c != -1)) | |
| 202 | + inStream.unread (c); | |
| 203 | + } | |
| 204 | + } | |
| 205 | + | |
| 206 | + /** | |
| 207 | + * In uuencoded buffers, encoded lines start with a character that | |
| 208 | + * represents the number of bytes encoded in this line. The last | |
| 209 | + * line of input is always a line that starts with a single space | |
| 210 | + * character, which would be a zero length line. | |
| 211 | + */ | |
| 212 | + protected int decodeLinePrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException { | |
| 213 | + int c; | |
| 214 | + | |
| 215 | + c = inStream.read(); | |
| 216 | + if (c == ' ') { | |
| 217 | + c = inStream.read(); /* discard the (first)trailing CR or LF */ | |
| 218 | + c = inStream.read(); /* check for a second one */ | |
| 219 | + if ((c != '\n') && (c != -1)) | |
| 220 | + inStream.unread (c); | |
| 221 | + throw new CEStreamExhausted(); | |
| 222 | + } else if (c == -1) { | |
| 223 | + throw new CEFormatException("UUDecoder: Short Buffer."); | |
| 224 | + } | |
| 225 | + | |
| 226 | + c = (c - ' ') & 0x3f; | |
| 227 | + if (c > bytesPerLine()) { | |
| 228 | + throw new CEFormatException("UUDecoder: Bad Line Length."); | |
| 229 | + } | |
| 230 | + return (c); | |
| 231 | + } | |
| 232 | + | |
| 233 | + | |
| 234 | + /** | |
| 235 | + * Find the end of the line for the next operation. | |
| 236 | + * The following sequences are recognized as end-of-line | |
| 237 | + * CR, CR LF, or LF | |
| 238 | + */ | |
| 239 | + protected void decodeLineSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException { | |
| 240 | + int c; | |
| 241 | + while (true) { | |
| 242 | + c = inStream.read(); | |
| 243 | + if (c == -1) { | |
| 244 | + throw new CEStreamExhausted(); | |
| 245 | + } | |
| 246 | + if (c == '\n') { | |
| 247 | + break; | |
| 248 | + } | |
| 249 | + if (c == '\r') { | |
| 250 | + c = inStream.read(); | |
| 251 | + if ((c != '\n') && (c != -1)) { | |
| 252 | + inStream.unread (c); | |
| 253 | + } | |
| 254 | + break; | |
| 255 | + } | |
| 256 | + } | |
| 257 | + } | |
| 258 | + | |
| 259 | + /** | |
| 260 | + * UUencoded files have a buffer suffix which consists of the word | |
| 261 | + * end. This line should immediately follow the line with a single | |
| 262 | + * space in it. | |
| 263 | + */ | |
| 264 | + protected void decodeBufferSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException { | |
| 265 | + int c; | |
| 266 | + | |
| 267 | + c = inStream.read(decoderBuffer); | |
| 268 | + if ((decoderBuffer[0] != 'e') || (decoderBuffer[1] != 'n') || | |
| 269 | + (decoderBuffer[2] != 'd')) { | |
| 270 | + throw new CEFormatException("UUDecoder: Missing 'end' line."); | |
| 271 | + } | |
| 272 | + } | |
| 273 | + | |
| 274 | +} | |