ORG.oclc.ecat.util
Class UUEncoder

java.lang.Object
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  +--ORG.oclc.ecat.util.CharacterEncoder
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        +--ORG.oclc.ecat.util.UUEncoder

public class UUEncoder

extends CharacterEncoder

This class implements a Berkeley uu character encoder. This encoder was made famous by uuencode 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:

     begin [mode] [filename]
 

This is followed by one or more lines of the form:

	(len)(data)(data)(data) ...
 

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 file 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]'

See Also:

CharacterEncoder, UUDecoder

Fields inherited from class ORG.oclc.ecat.util.CharacterEncoder

pStream

Constructor Summary

UUEncoder()
Default - buffer begin line will be: begin 644 encoder.buf

UUEncoder(String fname)
Specifies a name for the encoded bufer, begin line will be: begin 644 [FNAME]

UUEncoder(String fname, int newMode)
Specifies a name and mode for the encoded bufer, begin line will be: begin [MODE] [FNAME]

Methods inherited from class ORG.oclc.ecat.util.CharacterEncoder

encodeBuffer, encodeBuffer, encodeBuffer, readFully

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UUEncoder

public UUEncoder()

Default - buffer begin line will be:

	begin 644 encoder.buf
 

UUEncoder

public UUEncoder(String fname)

Specifies a name for the encoded bufer, begin line will be:

	begin 644 [FNAME]
 

UUEncoder

public UUEncoder(String fname,
                 int newMode)

Specifies a name and mode for the encoded bufer, begin line will be:

	begin [MODE] [FNAME]