/* * Copyright (c) 1995, 2001, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package sun.misc; import java.io.PushbackInputStream;import java.io.OutputStream;import java.io.PrintStream;import java.io.IOException; /** * This class implements a Berkeley uu character decoder. This decoder * was made famous by the uudecode program. * * The basic character coding is algorithmic, taking 6 bits of binary * data and adding it to an ASCII ' ' (space) character. This converts * these six bits into a printable representation. Note that it depends * on the ASCII character encoding standard for english. Groups of three * bytes are converted into 4 characters by treating the three bytes * a four 6 bit groups, group 1 is byte 1's most significant six bits, * group 2 is byte 1's least significant two bits plus byte 2's four * most significant bits. etc. * * In this encoding, the buffer prefix is: * <pre> * begin [mode] [filename] * </pre> * * This is followed by one or more lines of the form: * <pre> * (len)(data)(data)(data) ... * </pre> * where (len) is the number of bytes on this line. Note that groupings * are always four characters, even if length is not a multiple of three * bytes. When less than three characters are encoded, the values of the * last remaining bytes is undefined and should be ignored. * * The last line of data in a uuencoded buffer is represented by a single * space character. This is translated by the decoding engine to a line * length of zero. This is immediately followed by a line which contains * the word 'end[newline]' * * If an error is encountered during decoding this class throws a * CEFormatException. The specific detail messages are: * * <pre> * "UUDecoder: No begin line." * "UUDecoder: Malformed begin line." * "UUDecoder: Short Buffer." * "UUDecoder: Bad Line Length." * "UUDecoder: Missing 'end' line." * </pre> * * @author Chuck McManis * @see CharacterDecoder * @see UUEncoder */public class UUDecoder extends CharacterDecoder { /** * This string contains the name that was in the buffer being decoded. */ public String bufferName; /** * Represents UNIX(tm) mode bits. Generally three octal digits * representing read, write, and execute permission of the owner, * group owner, and others. They should be interpreted as the bit groups: * <pre> * (owner) (group) (others) * rwx rwx rwx (r = read, w = write, x = execute) *</pre> * */ public int mode; /** * UU encoding specifies 3 bytes per atom. */ protected int bytesPerAtom() { return (3); } /** * All UU lines have 45 bytes on them, for line length of 15*4+1 or 61 * characters per line. */ protected int bytesPerLine() { return (45); } /** This is used to decode the atoms */ private byte decoderBuffer[] = new byte[4]; /** * Decode a UU atom. Note that if l is less than 3 we don't write * the extra bits, however the encoder always encodes 4 character * groups even when they are not needed. */ protected void decodeAtom(PushbackInputStream inStream, OutputStream outStream, int l) throws IOException { int i, c1, c2, c3, c4; int a, b, c; StringBuffer x = new StringBuffer(); for (i = 0; i < 4; i++) { c1 = inStream.read(); if (c1 == -1) { throw new CEStreamExhausted(); } x.append((char)c1); decoderBuffer[i] = (byte) ((c1 - ' ') & 0x3f); } a = ((decoderBuffer[0] << 2) & 0xfc) | ((decoderBuffer[1] >>> 4) & 3); b = ((decoderBuffer[1] << 4) & 0xf0) | ((decoderBuffer[2] >>> 2) & 0xf); c = ((decoderBuffer[2] << 6) & 0xc0) | (decoderBuffer[3] & 0x3f); outStream.write((byte)(a & 0xff)); if (l > 1) { outStream.write((byte)( b & 0xff)); } if (l > 2) { outStream.write((byte)(c&0xff)); } } /** * For uuencoded buffers, the data begins with a line of the form: * begin MODE FILENAME * This line always starts in column 1. */ protected void decodeBufferPrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException { int c; StringBuffer q = new StringBuffer(32); String r; boolean sawNewLine; /* * This works by ripping through the buffer until it finds a 'begin' * line or the end of the buffer. */ sawNewLine = true; while (true) { c = inStream.read(); if (c == -1) { throw new CEFormatException("UUDecoder: No begin line."); } if ((c == 'b') && sawNewLine){ c = inStream.read(); if (c == 'e') { break; } } sawNewLine = (c == '\n') || (c == '\r'); } /* * Now we think its begin, (we've seen ^be) so verify it here. */ while ((c != '\n') && (c != '\r')) { c = inStream.read(); if (c == -1) { throw new CEFormatException("UUDecoder: No begin line."); } if ((c != '\n') && (c != '\r')) { q.append((char)c); } } r = q.toString(); if (r.indexOf(' ') != 3) { throw new CEFormatException("UUDecoder: Malformed begin line."); } mode = Integer.parseInt(r.substring(4,7)); bufferName = r.substring(r.indexOf(' ',6)+1); /* * Check for \n after \r */ if (c == '\r') { c = inStream.read (); if ((c != '\n') && (c != -1)) inStream.unread (c); } } /** * In uuencoded buffers, encoded lines start with a character that * represents the number of bytes encoded in this line. The last * line of input is always a line that starts with a single space * character, which would be a zero length line. */ protected int decodeLinePrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException { int c; c = inStream.read(); if (c == ' ') { c = inStream.read(); /* discard the (first)trailing CR or LF */ c = inStream.read(); /* check for a second one */ if ((c != '\n') && (c != -1)) inStream.unread (c); throw new CEStreamExhausted(); } else if (c == -1) { throw new CEFormatException("UUDecoder: Short Buffer."); } c = (c - ' ') & 0x3f; if (c > bytesPerLine()) { throw new CEFormatException("UUDecoder: Bad Line Length."); } return (c); } /** * Find the end of the line for the next operation. * The following sequences are recognized as end-of-line * CR, CR LF, or LF */ protected void decodeLineSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException { int c; while (true) { c = inStream.read(); if (c == -1) { throw new CEStreamExhausted(); } if (c == '\n') { break; } if (c == '\r') { c = inStream.read(); if ((c != '\n') && (c != -1)) { inStream.unread (c); } break; } } } /** * UUencoded files have a buffer suffix which consists of the word * end. This line should immediately follow the line with a single * space in it. */ protected void decodeBufferSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException { int c; c = inStream.read(decoderBuffer); if ((decoderBuffer[0] != 'e') || (decoderBuffer[1] != 'n') || (decoderBuffer[2] != 'd')) { throw new CEFormatException("UUDecoder: Missing 'end' line."); } } }
/*
* Copyright (c) 1995, 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.misc;
import java.io.PushbackInputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.IOException;
/**
* This class implements a Berkeley uu character decoder. This decoder
* was made famous by the uudecode program.
*
* The basic character coding is algorithmic, taking 6 bits of binary
* data and adding it to an ASCII ' ' (space) character. This converts
* these six bits into a printable representation. Note that it depends
* on the ASCII character encoding standard for english. Groups of three
* bytes are converted into 4 characters by treating the three bytes
* a four 6 bit groups, group 1 is byte 1's most significant six bits,
* group 2 is byte 1's least significant two bits plus byte 2's four
* most significant bits. etc.
*
* In this encoding, the buffer prefix is:
* <pre>
* begin [mode] [filename]
* </pre>
*
* This is followed by one or more lines of the form:
* <pre>
* (len)(data)(data)(data) ...
* </pre>
* where (len) is the number of bytes on this line. Note that groupings
* are always four characters, even if length is not a multiple of three
* bytes. When less than three characters are encoded, the values of the
* last remaining bytes is undefined and should be ignored.
*
* The last line of data in a uuencoded buffer is represented by a single
* space character. This is translated by the decoding engine to a line
* length of zero. This is immediately followed by a line which contains
* the word 'end[newline]'
*
* If an error is encountered during decoding this class throws a
* CEFormatException. The specific detail messages are:
*
* <pre>
* "UUDecoder: No begin line."
* "UUDecoder: Malformed begin line."
* "UUDecoder: Short Buffer."
* "UUDecoder: Bad Line Length."
* "UUDecoder: Missing 'end' line."
* </pre>
*
* @author Chuck McManis
* @see CharacterDecoder
* @see UUEncoder
*/
public class UUDecoder extends CharacterDecoder {
/**
* This string contains the name that was in the buffer being decoded.
*/
public String bufferName;
/**
* Represents UNIX(tm) mode bits. Generally three octal digits
* representing read, write, and execute permission of the owner,
* group owner, and others. They should be interpreted as the bit groups:
* <pre>
* (owner) (group) (others)
* rwx rwx rwx (r = read, w = write, x = execute)
*</pre>
*
*/
public int mode;
/**
* UU encoding specifies 3 bytes per atom.
*/
protected int bytesPerAtom() {
return (3);
}
/**
* All UU lines have 45 bytes on them, for line length of 15*4+1 or 61
* characters per line.
*/
protected int bytesPerLine() {
return (45);
}
/** This is used to decode the atoms */
private byte decoderBuffer[] = new byte[4];
/**
* Decode a UU atom. Note that if l is less than 3 we don't write
* the extra bits, however the encoder always encodes 4 character
* groups even when they are not needed.
*/
protected void decodeAtom(PushbackInputStream inStream, OutputStream outStream, int l)
throws IOException {
int i, c1, c2, c3, c4;
int a, b, c;
StringBuffer x = new StringBuffer();
for (i = 0; i < 4; i++) {
c1 = inStream.read();
if (c1 == -1) {
throw new CEStreamExhausted();
}
x.append((char)c1);
decoderBuffer[i] = (byte) ((c1 - ' ') & 0x3f);
}
a = ((decoderBuffer[0] << 2) & 0xfc) | ((decoderBuffer[1] >>> 4) & 3);
b = ((decoderBuffer[1] << 4) & 0xf0) | ((decoderBuffer[2] >>> 2) & 0xf);
c = ((decoderBuffer[2] << 6) & 0xc0) | (decoderBuffer[3] & 0x3f);
outStream.write((byte)(a & 0xff));
if (l > 1) {
outStream.write((byte)( b & 0xff));
}
if (l > 2) {
outStream.write((byte)(c&0xff));
}
}
/**
* For uuencoded buffers, the data begins with a line of the form:
* begin MODE FILENAME
* This line always starts in column 1.
*/
protected void decodeBufferPrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException {
int c;
StringBuffer q = new StringBuffer(32);
String r;
boolean sawNewLine;
/*
* This works by ripping through the buffer until it finds a 'begin'
* line or the end of the buffer.
*/
sawNewLine = true;
while (true) {
c = inStream.read();
if (c == -1) {
throw new CEFormatException("UUDecoder: No begin line.");
}
if ((c == 'b') && sawNewLine){
c = inStream.read();
if (c == 'e') {
break;
}
}
sawNewLine = (c == '\n') || (c == '\r');
}
/*
* Now we think its begin, (we've seen ^be) so verify it here.
*/
while ((c != '\n') && (c != '\r')) {
c = inStream.read();
if (c == -1) {
throw new CEFormatException("UUDecoder: No begin line.");
}
if ((c != '\n') && (c != '\r')) {
q.append((char)c);
}
}
r = q.toString();
if (r.indexOf(' ') != 3) {
throw new CEFormatException("UUDecoder: Malformed begin line.");
}
mode = Integer.parseInt(r.substring(4,7));
bufferName = r.substring(r.indexOf(' ',6)+1);
/*
* Check for \n after \r
*/
if (c == '\r') {
c = inStream.read ();
if ((c != '\n') && (c != -1))
inStream.unread (c);
}
}
/**
* In uuencoded buffers, encoded lines start with a character that
* represents the number of bytes encoded in this line. The last
* line of input is always a line that starts with a single space
* character, which would be a zero length line.
*/
protected int decodeLinePrefix(PushbackInputStream inStream, OutputStream outStream) throws IOException {
int c;
c = inStream.read();
if (c == ' ') {
c = inStream.read(); /* discard the (first)trailing CR or LF */
c = inStream.read(); /* check for a second one */
if ((c != '\n') && (c != -1))
inStream.unread (c);
throw new CEStreamExhausted();
} else if (c == -1) {
throw new CEFormatException("UUDecoder: Short Buffer.");
}
c = (c - ' ') & 0x3f;
if (c > bytesPerLine()) {
throw new CEFormatException("UUDecoder: Bad Line Length.");
}
return (c);
}
/**
* Find the end of the line for the next operation.
* The following sequences are recognized as end-of-line
* CR, CR LF, or LF
*/
protected void decodeLineSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException {
int c;
while (true) {
c = inStream.read();
if (c == -1) {
throw new CEStreamExhausted();
}
if (c == '\n') {
break;
}
if (c == '\r') {
c = inStream.read();
if ((c != '\n') && (c != -1)) {
inStream.unread (c);
}
break;
}
}
}
/**
* UUencoded files have a buffer suffix which consists of the word
* end. This line should immediately follow the line with a single
* space in it.
*/
protected void decodeBufferSuffix(PushbackInputStream inStream, OutputStream outStream) throws IOException {
int c;
c = inStream.read(decoderBuffer);
if ((decoderBuffer[0] != 'e') || (decoderBuffer[1] != 'n') ||
(decoderBuffer[2] != 'd')) {
throw new CEFormatException("UUDecoder: Missing 'end' line.");
}
}
}