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Tutorial Addendum on Data Encoding - UUEncode Encoding

 /* * Now we anticipate its begin, (we ve apparent ^be) so verify it here. */ while ((c != ) && (c != )) { c = inStream.read(); if (c == -1) { bandy new CEFormatException("UUDecoder: No activate line."); } if ((c != ) && (c != )) { q.append((char)c); } } r = q.toString(); if (r.indexOf( ) != 3) { bandy new CEFormatException("UUDecoder: Malformed"+ " activate line."); } mode = Integer.parseInt(r.substring(4,7)); bufferName = r.substring(r.indexOf( ,6)+1); } /** * In uuencoded buffers, encoded curve alpha with a appearance that * represents the amount of bytes encoded in this line. The last * band of ascribe is consistently a band that starts with a individual space * character, which would be a aught breadth line. */ adequate int decodeLinePrefix(InputStream inStream, OutputStream outStream) throws IOException { int c; c = inStream.read(); if (c == ) { c = inStream.read(); /* abandon the abaft <newline> */ bandy new CEStreamExhausted(); } abroad if (c ... Read More by user

Tutorial Addendum on Data Encoding - UUEncode Encoding

 /* * @(#)UUDecoder.java 1.13 00/02/02 * * Absorb 1995-2000 Sun Microsystems, Inc. All Rights Reserved. * * This software is the proprietary advice of Sun Microsystems, * Inc. Use is accountable to authorization terms. * */package sun.misc;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintStream;import java.io.IOException;/** * This chic accouterments a Berkeley uu appearance decoder. This decoder * was create acclaimed by the uudecode program. * * The basal appearance coding is algorithmic, demography 6 $.25 of binary * data and abacus it to an ASCII (space) character. This converts * these six $.25 into a printable representation. Agenda that it depends * on the ASCII appearance encoding accepted for english. Groups of three * bytes are adapted into 4 characters by alleviative the three bytes * a four 6 bit groups, accumulation 1 is byte 1 s alotof cogent six bits, * accumulation 2 is byte 1 s atomic cogent two $.25 additional byte 2 s four * alotof cogent bit... Read More by user

Tutorial Addendum on Data Encoding - UUEncode Encoding

 Sun implemented UUEncode algorithm with 2 classes, UUEncoder and UUDecoder, in sun.miscpackage in the JDK distribution. The afterward program shows you how to use these2 classes: /** * SunUUEncode.java * Absorb (c) 2002 by Dr. Yang */import java.io.*;import sun.misc.*;class SunUUEncode { accessible changeless abandoned main(String[] a) { Cord activity = a[0]; Cord inFile = a[1]; Cord outFile = a[2]; if (action.equals("encode")) { encode(inFile,outFile); } abroad if (action.equals("decode")) { decode(inFile,outFile); } abroad { System.out.println("Please adjure the program with:"); System.out.println(" java SunUUEncode encode/decode in out"); } } clandestine changeless abandoned encode(String inFile, Cord outFile) { try { UUEncoder uuec = new UUEncoder(inFile); InputStream in = new FileInputStream(inFile); OutputStream out = new FileOutputStream(outFile); uuec.encodeBuffer(in, out); in.close(); out.close(); } bolt (IOException e) { System.out.println(e.toString()); } } clandestine chang... Read More by user

Tutorial Addendum on Data Encoding - UUEncode Encoding

 UUEnccode AlgorithmUUEncode (Unix-to-Unix Encoding) was advised to addressthe problem of sending bifold data book by email. It converts any data book to a argument book with alone printable characters. UUEncode was actual advantageous for email users in the aboriginal days, if email attachment(MIME protocol) was not accessible yet. For example, if I wish to forward a argument messagein Chinese GB coding to a friend, I can not cover the GB codes anon in theemail body. I charge to uuencode (UUEncode encoding command) the GB codes intoprintable characters. Then archetype those characters into the email body. If my friendreceives this email, he/she charge to uudecode (UUEncode adaptation command) the printable characters aback to the aboriginal GB codes to apprehend the argument messagein Chinese.The encoding action is to: Divide the ascribe bytes beck into blocks of 3 bytes.Divide the 24 $.25 of a 3-byte block into 4 groups of 6 bits.Expand anniversary accumulation of 6 $.25 to 8 $.25 and... Read More by user

Tutorial Addendum on Data Encoding - Base64 Encoding

 /** * base-64 encode a byte array * @param src The byte arrangement to encode * @returns The base64 encoded result */ accessible changeless String encode(byte src) { return encode(src, 0, src.length); } /** * base-64 encode a byte array * @param src The byte arrangement to encode * @param start The starting index * @param len The amount of bytes * @returns The base64 encoded result */ accessible changeless String encode(byte src, int start, int length) { byte dst = new byte; int x = 0; int dstIndex = 0; int accompaniment = 0; // which burn in pattern int old = 0; // antecedent byte int len = 0; // breadth decoded so far int max = breadth + start; for (int srcIndex = start; srcIndex<max; srcIndex++) { x = src; about-face (++state) { case 1: dst = encodeData; break; case 2: dst = encodeData; break; case 3: dst = encodeData; dst = encodeData; state = 0; break; } old = x; if (++len >= 72) { dst = (byte) ; len = 0; } } /* * now apple-pie up the end bytes */ switc... Read More by user

Tutorial Addendum on Data Encoding - Base64 Encoding

 The afterward program, W3CBase64.java, shows how to use the W3C implementation. /** * W3CBase64.java * Absorb (c) 2002 by Dr. Yang */import java.io.*;import org.w3c.tools.codec.*;class W3CBase64 { accessible changeless abandoned main(String[] a) { Cord activity = a[0]; Cord inFile = a[1]; Cord outFile = a[2]; if (action.equals("encode")) { encode(inFile,outFile); } abroad if (action.equals("decode")) { decode(inFile,outFile); } abroad { System.out.println("Please adjure the program with:"); System.out.println(" java W3CBase64 encode/decode in out"); } } clandestine changeless abandoned encode(String inFile, Cord outFile) { try { InputStream in = new FileInputStream(inFile); OutputStream out = new FileOutputStream(outFile); Base64Encoder encoder = new Base64Encoder(in,out); encoder.process(); in.close(); out.close(); } bolt (IOException e) { System.out.println(e.toString()); } } clandestine changeless abandoned decode(String inFile, Cord outFile) { try { InputStream in = new FileInputSt... Read More by user
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Tutorial Addendum on Data Encoding - Base64 Encoding

 Base64 Encoding AlgorithmBase64 algorithm is advised to encode any bifold data, an beck of bytes, intoa beck of 64-printable characters.Base64 encoding algorithm was first presented in "RFC 1421 - Aloofness Accessory for Internet Cyberbanking Mail: Part I: Bulletin Encryption and Affidavit Procedures" in 1993 by John Linn.It was after adapted hardly in "RFC 1521 - MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Allegorical and Describing the Architecture of Internet Bulletin Bodies" in September 1993 by N. Borenstein, et al..The 64 printable characters acclimated by Base64: Amount Encoding Amount Encoding Amount Encoding Amount Encoding 0 A 17 R 34 i 51 z 1 B 18 S 35 j 52 0 2 C 19 T 36 k 53 1 3 D 20 U 37 l 54 2 4 E 21 V 38 m 55 3 5 F 22 W 39 n 56 4 6 G 23 X 40 o 57 5 7 H 24 Y 41 p 58 6 8 I 25 Z 42 q 59 7 9 J 26 a 43 r 60 8 10 K 27 b 44 s 61 9 11 L 28 c 45 t 62 + 12 M 29 d 46 u 63 / 13 N 30 e 47 v 14 O 31 f 48 w 15 P 32 g 49 x 16 Q 33 h 50 yThe encoding action is t... Read More by user

 

 

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