зеркало из https://github.com/mozilla/pjs.git
197 строки
6.9 KiB
Java
197 строки
6.9 KiB
Java
/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1997
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* Netscape Communications Corporation. All Rights Reserved.
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*
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* Created: Jamie Zawinski <jwz@netscape.com>, 28 Aug 1997.
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*/
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package grendel.mime.encoder;
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import calypso.util.ByteBuf;
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/** Implements a uuencode -> plaintext decoder.
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*/
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public final class MimeUUDecoder extends MimeEncoder {
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// Maps ASCII characters to their corresponding uuencode 6-bit values.
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static private final byte map[] = {
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0, 0, 0, 0, 0, 0, 0, 0, // 000-007
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0, 0, 0, 0, 0, 0, 0, 0, // 010-017
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0, 0, 0, 0, 0, 0, 0, 0, // 020-027
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0, 0, 0, 0, 0, 0, 0, 0, // 030-037
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0, 1, 2, 3, 4, 5, 6, 7, // 040-047 !"#$%&'
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8, 9, 10, 11, 12, 13, 14, 15, // 050-057 ()*+,-./
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16, 17, 18, 19, 20, 21, 22, 23, // 060-067 01234567
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24, 25, 26, 27, 28, 29, 30, 31, // 070-077 89:;<=>?
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32, 33, 34, 35, 36, 37, 38, 39, // 100-107 @ABCDEFG
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40, 41, 42, 43, 44, 45, 46, 47, // 110-117 HIJKLMNO
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48, 49, 50, 51, 52, 53, 54, 55, // 120-127 PQRSTUVW
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56, 57, 58, 59, 60, 61, 62, 63, // 130-137 XYZ[\]^_
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0, 0, 0, 0, 0, 0, 0, 0, // 140-147 `abcdefg
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0, 0, 0, 0, 0, 0, 0, 0, // 150-157 hijklmno
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0, 0, 0, 0, 0, 0, 0, 0, // 160-167 pqrstuvw
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0, 0, 0, 0, 0, 0, 0, 0, // 170-177 xyz{|}~
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0, 0, 0, 0, 0, 0, 0, 0, // 200-207
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0, 0, 0, 0, 0, 0, 0, 0, // 210-217
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0, 0, 0, 0, 0, 0, 0, 0, // 220-227
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0, 0, 0, 0, 0, 0, 0, 0, // 230-237
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0, 0, 0, 0, 0, 0, 0, 0, // 240-247
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0, 0, 0, 0, 0, 0, 0, 0, // 250-257
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0, 0, 0, 0, 0, 0, 0, 0, // 260-267
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0, 0, 0, 0, 0, 0, 0, 0, // 270-277
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0, 0, 0, 0, 0, 0, 0, 0, // 300-307
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0, 0, 0, 0, 0, 0, 0, 0, // 310-317
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0, 0, 0, 0, 0, 0, 0, 0, // 320-327
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0, 0, 0, 0, 0, 0, 0, 0, // 330-337
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0, 0, 0, 0, 0, 0, 0, 0, // 340-347
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0, 0, 0, 0, 0, 0, 0, 0, // 350-357
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0, 0, 0, 0, 0, 0, 0, 0, // 360-367
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0, 0, 0, 0, 0, 0, 0, 0, // 370-377
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};
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static private final int BEGIN = 100;
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static private final int BODY = 101;
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static private final int END = 102;
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int state = BEGIN;
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ByteBuf line_buf = new ByteBuf(80); // we buffer by lines while decoding
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ByteBuf out_buf = new ByteBuf(80); // line buffering output is faster
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private final void decode_line(ByteBuf out) {
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byte line[] = line_buf.toBytes();
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int length = line_buf.length();
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if (state == BODY &&
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length == 3 &&
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line[0] == 'e' &&
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line[1] == 'n' &&
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line[2] == 'd') {
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state = END;
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line_buf = null;
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} else if (state == BEGIN) {
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if (length >= 9 &&
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line[0] == 'b' &&
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line[1] == 'e' &&
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line[2] == 'g' &&
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line[3] == 'i' &&
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line[4] == 'n' &&
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line[5] == ' ') {
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state = BODY;
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}
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} else if (length > 1) { // state == BODY
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// We map down `line', reading four bytes and writing three.
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out_buf.ensureCapacity(length);
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byte outb[] = out_buf.toBytes();
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int outi = 0;
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int i = map[line[0]];
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int lost = i - (((length - 1) * 3) / 4);
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// If lost is >0 get here, then the line is shorter than the length byte
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// at the beginning says it should be: it's internally inconsistent. We
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// will parse from it what we can...
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//
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// This probably happened because some gateway stripped trailing
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// whitespace from the end of the line -- so pretend the line was padded
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// with spaces (which conveniently map to \000...)
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if (lost > 0)
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i -= lost;
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int in = 0;
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for (++in; i > 0; in += 4, i -= 3) {
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if (i >= 3) {
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// We read four; write three.
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outb[outi++] = (byte) (map[line[in]] << 2 | map[line[in+1]] >> 4);
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outb[outi++] = (byte) (map[line[in+1]] << 4 | map[line[in+2]] >> 2);
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outb[outi++] = (byte) (map[line[in+2]] << 6 | map[line[in+3]]);
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} else {
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// Handle a line that isn't a multiple of 4 long.
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// (We read 1, 2, or 3, and will write 1 or 2.)
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outb[outi++] = (byte)(map[line[in]] << 2 | map[line[in+1]] >> 4);
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if (i == 2) {
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outb[outi++] = (byte)(map[line[in+1]] << 4 | map[line[in+2]] >> 2);
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}
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}
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}
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// If the line was truncated, pad the missing bytes with 0 (SPC). */
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while (lost > 0) {
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outb[outi++] = 0;
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lost--;
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}
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// Append to `out' a line at a time, so that we don't make one method
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// call per *byte*... (It's more like one per 38 or something.)
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out.append(outb, 0, outi);
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}
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if (line_buf != null)
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line_buf.setLength(0);
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}
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/** Given a sequence of input bytes in the uuencode encoding, produces a
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sequence of unencoded output bytes. Note that some (small) amount of
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buffering may be necessary, if the input byte stream didn't fall on an
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appropriate boundary. If there are bytes in `out' already, the new
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bytes are appended, so the caller should do `out.setLength(0)' first
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if that's desired.
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*/
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public final void translate(ByteBuf in, ByteBuf out) {
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if (line_buf == null)
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return;
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byte inb[] = in.toBytes();
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int in_length = in.length();
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for (int i = 0; i < in_length; i++) {
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if (inb[i] == '\r' || inb[i] == '\n') {
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if (line_buf.length() != 0) {
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decode_line(out);
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if (line_buf == null)
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return;
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}
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} else {
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line_buf.append(inb[i]);
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}
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}
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}
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/** Tell the uudecoder that no more input data will be forthcoming. This
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may result in output, as a result of flushing the internal buffer.
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This object must not be used again after calling eof(). If there are
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bytes in `out' already, the new bytes are appended, so the caller should
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do `out.setLength(0)' first if that's desired.
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*/
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public final void eof(ByteBuf out) {
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if (line_buf != null &&
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line_buf.length() != 0)
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decode_line(out);
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line_buf = null;
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out_buf = null;
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}
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}
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