My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/misc/UUEncoder.java (1 of 18352 files). Show all

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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	+}