'\"
'\" Generated from file 'yencode\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2002, Pat Thoyts
'\"
.TH "yencode" 3tcl 1\&.1\&.2 tcllib "Text encoding & decoding binary data"
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.SH NAME
yencode \- Y-encode/decode binary data
.SH SYNOPSIS
package require \fBTcl  8\&.2\fR
.sp
package require \fByencode  ?1\&.1\&.2?\fR
.sp
\fB::yencode::encode\fR \fIstring\fR
.sp
\fB::yencode::decode\fR \fIstring\fR
.sp
\fB::yencode::yencode\fR ?\fB-name\fR \fIstring\fR? ?\fB-line\fR \fIinteger\fR? ?\fB-crc32\fR \fIboolean\fR? (\fB-file\fR \fIfilename\fR | ?\fB--\fR? \fIstring\fR)
.sp
\fB::yencode::ydecode\fR (\fB-file\fR \fIfilename\fR | ?\fB--\fR? \fIstring\fR)
.sp
.BE
.SH DESCRIPTION
.PP
This package provides a Tcl-only implementation of the yEnc file
encoding\&. This is a recently introduced method of encoding binary
files for transmission through Usenet\&. This encoding packs binary data
into a format that requires an 8-bit clean transmission layer but that
escapes characters special to the \fINNTP\fR posting protocols\&. See
\fIhttp://www\&.yenc\&.org/\fR for details concerning the algorithm\&.
.TP
\fB::yencode::encode\fR \fIstring\fR
returns the yEnc encoded data\&.
.TP
\fB::yencode::decode\fR \fIstring\fR
Decodes the given yEnc encoded data\&.
.TP
\fB::yencode::yencode\fR ?\fB-name\fR \fIstring\fR? ?\fB-line\fR \fIinteger\fR? ?\fB-crc32\fR \fIboolean\fR? (\fB-file\fR \fIfilename\fR | ?\fB--\fR? \fIstring\fR)
Encode a file or block of data\&.
.TP
\fB::yencode::ydecode\fR (\fB-file\fR \fIfilename\fR | ?\fB--\fR? \fIstring\fR)
Decode a file or block of data\&. A file may contain more than one
embedded file so the result is a list where each element is a three
element list of filename, file size and data\&.
.PP
.SH OPTIONS
.TP
-filename name
Cause the yencode or ydecode commands to read their data from the
named file rather that taking a string parameter\&.
.TP
-name string
The encoded data header line contains the suggested file name to be
used when unpacking the data\&. Use this option to change this from the
default of "data\&.dat"\&.
.TP
-line integer
The yencoded data header line contains records the line length used
during the encoding\&. Use this option to select a line length other
that the default of 128\&. Note that NNTP imposes a 1000 character line
length limit and some gateways may have trouble with more than 255
characters per line\&.
.TP
-crc32 boolean
The yEnc specification recommends the inclusion of a cyclic redundancy
check value in the footer\&. Use this option to change the default from
\fItrue\fR to \fIfalse\fR\&.
.PP
.PP
.CS


% set d [yencode::yencode -file testfile\&.txt]
=ybegin line=128 size=584 name=testfile\&.txt
 -o- data not shown -o-
=yend size=584 crc32=ded29f4f

.CE
.SH REFERENCES
.IP [1]
\fIhttp://www\&.yenc\&.org/yenc-draft\&.1\&.3\&.txt\fR
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIbase64\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
encoding, yEnc, ydecode, yencode
.SH CATEGORY
Text processing
.SH COPYRIGHT
.nf
Copyright (c) 2002, Pat Thoyts

.fi