%%
%% This is file `bytefield.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% bytefield.dtx  (with options: `package')
%% 
%% This is a generated file.
%% 
%% Copyright (C) 2011 by Scott Pakin <scott+bf@pakin.org>
%% 
%% This file may be distributed and/or modified under the conditions of
%% the LaTeX Project Public License, either version 1.3a of this license
%% or (at your option) any later version.  The latest version of this
%% license is in:
%% 
%%    http://www.latex-project.org/lppl.txt
%% 
%% and version 1.3c or later is part of all distributions of LaTeX version
%% 2006/05/20 or later.
%% 
\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\ProvidesPackage{bytefield}
    [2011/01/25 v2.0 Network protocol diagrams]
\RequirePackage{calc}[1998/07/07]
\RequirePackage{keyval}
\def\bf@newdimen#1{\advance\count11 by 1
  \ch@ck1\insc@unt\dimen
  \allocationnumber=\count11
  \dimendef#1=\allocationnumber
  \wlog{\string#1=\string\dimen\the\allocationnumber\space (locally)}%
}
\AtBeginDocument{%
  \begingroup\expandafter\expandafter\expandafter\endgroup
  \expandafter\ifx\csname locdimen\endcsname\relax
  \else
    \let\bf@newdimen\locdimen
  \fi
}
\newlength{\bytefield@height}
\newif\ifcounting@words
\newlength{\bytefield@height@increment}
\DeclareRobustCommand{\inc@bytefield@height}[1]{%
  \setlength{\bytefield@height@increment}{#1}%
  \global\advance\bytefield@height by \bytefield@height@increment}
\newcounter{bits@wide}
\newsavebox{\entire@bytefield@picture}
\newenvironment{bytefield}[2][]{%
  \bf@bytefieldsetup{#1}%
  \setcounter{bits@wide}{#2}%
  \let\old@nl=\\%
  \let\amp=&%
  \catcode`\&=10
  \openup -1pt
  \setlength{\bytefield@height}{0pt}%
  \setlength{\unitlength}{1pt}%
  \global\counting@wordstrue
  \begin{lrbox}{\entire@bytefield@picture}%
  \renewcommand{\\}{%
    \unskip
    \amp\show@wordlabelr\cr
    \ignorespaces\global\counting@wordstrue\make@lspace\amp}%
  \vbox\bgroup\ialign\bgroup##\amp##\amp##\cr\amp
}{%
  \amp\show@wordlabelr\cr\egroup\egroup
  \end{lrbox}%
  \usebox{\entire@bytefield@picture}}
\newcommand*{\bf@bitformatting}{\tiny}
\newcommand*{\bf@boxformatting}{\centering}
\newlength{\bf@bitwidth}
\settowidth{\bf@bitwidth}{\bf@bitformatting{99i}}
\newlength{\bf@bitheight}
\setlength{\bf@bitheight}{4ex}
\newlength{\units@wide}
\newlength{\units@tall}
\DeclareRobustCommand{\bitbox}[3][lrtb]{%
  \setlength{\units@wide}{\bf@bitwidth * #2}%
  \parse@bitbox@arg{#1}%
  \draw@bit@picture{\strip@pt\units@wide}{\strip@pt\bf@bitheight}{#3}}
\DeclareRobustCommand{\wordbox}[3][lrtb]{%
  \setlength{\units@wide}{\bf@bitwidth * \value{bits@wide}}%
  \setlength{\units@tall}{\bf@bitheight * #2}%
  \parse@bitbox@arg{#1}%
  \draw@bit@picture{\strip@pt\units@wide}{\strip@pt\units@tall}{#3}}
\DeclareRobustCommand{\draw@bit@picture}[3]{%
  \begin{picture}(#1,#2)%
    \put(0,0){\makebox(#1,#2){\parbox{#1\unitlength}{%
      \bf@newdimen\height
      \bf@newdimen\depth
      \bf@newdimen\totalheight
      \bf@newdimen\width
      \height=#2\unitlength
      \depth=0pt%
      \totalheight=#2\unitlength
      \width=#1\unitlength
      \def\widthunits{#1}%
      \def\heightunits{#2}%
      \bf@boxformatting{#3\par}}}}%
    \ifbitbox@top
      \put(0,#2){\line(1,0){#1}}
    \fi
    \ifbitbox@bottom
      \put(0,0){\line(1,0){#1}}
    \fi
    \ifbitbox@left
      \put(0,0){\line(0,1){#2}}
    \fi
    \ifbitbox@right
      \put(#1,0){\line(0,1){#2}}
    \fi
  \end{picture}%
  \ifcounting@words
    \inc@bytefield@height{\unitlength * \real{#2}}%
    \global\counting@wordsfalse
  \fi
  \ignorespaces}
\newif\ifbitbox@top
\newif\ifbitbox@bottom
\newif\ifbitbox@left
\newif\ifbitbox@right
\def\parse@bitbox@arg#1{%
  \bitbox@topfalse
  \bitbox@bottomfalse
  \bitbox@leftfalse
  \bitbox@rightfalse
  \parse@bitbox@sides#1X}
\def\parse@bitbox@sides#1{%
  \ifx#1X%
  \else
    \ifx#1t%
      \bitbox@toptrue
    \else
      \ifx#1b%
        \bitbox@bottomtrue
      \else
        \ifx#1l%
          \bitbox@lefttrue
        \else
          \ifx#1r%
            \bitbox@righttrue
          \fi
        \fi
      \fi
    \fi
    \expandafter\parse@bitbox@sides
  \fi}
\newlength{\units@high}
\DeclareRobustCommand{\skippedwords}[1][2ex]{%
  \setlength{\units@wide}{\bf@bitwidth * \value{bits@wide}}%
  \setlength{\units@high}{1pt * \ratio{\units@wide}{6.0pt}}%
  \setlength{\units@tall}{#1 + \units@high}%
  \edef\num@wide{\strip@pt\units@wide}%
  \edef\num@tall{\strip@pt\units@tall}%
  \edef\num@high{\strip@pt\units@high}%
  \begin{picture}(\num@wide,\num@tall)
    \put(0,\num@tall){\line(6,-1){\num@wide}}
    \put(\num@wide,0){\line(-6,1){\num@wide}}
    \put(0,0){\line(0,1){\num@high}}
    \put(\num@wide,\num@tall){\line(0,-1){\num@high}}
  \end{picture}%
  \ifcounting@words
    \inc@bytefield@height{\unitlength * \real{\num@tall}}%
    \global\counting@wordsfalse
  \fi}
\DeclareRobustCommand{\bitheader}[2][l]{%
  \parse@bitbox@arg{lrtb}%
  \setlength{\units@wide}{\bf@bitwidth * \value{bits@wide}}%
  \setlength{\units@tall}{\heightof{\bf@bitformatting{1234567890}}}%
  \setlength{\units@high}{\units@tall * -1}%
  \def\bit@endianness{#1}%
  \begin{picture}(\strip@pt\units@wide,\strip@pt\units@tall)%
                 (0,\strip@pt\units@high)
    \parse@range@list#2,X,
  \end{picture}%
  \ifcounting@words
    \inc@bytefield@height{\unitlength * \real{\strip@pt\units@tall}}%
    \global\counting@wordsfalse
  \fi
  \ignorespaces}
\def\parse@range@list#1,{%
  \ifx X#1
  \else
    \parse@range#1-#1-#1\relax
    \expandafter\parse@range@list
  \fi}
\newlength{\header@xpos}
\newcounter{header@val}
\newcounter{max@header@val}
\def\parse@range#1-#2-#3\relax{%
  \setcounter{header@val}{#1}
  \setcounter{max@header@val}{#2 + 1}
  \loop
    \ifnum\value{header@val}<\value{max@header@val}%
      \if\bit@endianness b%
        \setlength{\header@xpos}{%
          \bf@bitwidth * (\value{bits@wide}-\value{header@val}-1)}
      \else
        \setlength{\header@xpos}{\bf@bitwidth * \value{header@val}}
      \fi
      \put(\strip@pt\header@xpos,0){%
        \makebox(\strip@pt\bf@bitwidth,\strip@pt\units@tall){%
          \bf@bitformatting{\theheader@val}}}
      \addtocounter{header@val}{1}
  \repeat}
\def\bf@leftcurlyshrinkage{5pt}
\def\bf@rightcurlyshrinkage{5pt}
\def\bf@leftcurlyspace{0pt}
\def\bf@rightcurlyspace{0pt}
\def\bf@leftlabelspace{0pt}
\def\bf@rightlabelspace{0pt}
\gdef\bf@leftcurlyspace{1ex}
\gdef\bf@rightcurlyspace{1ex}
\gdef\bf@leftlabelspace{0.5ex}
\gdef\bf@rightlabelspace{0.5ex}
\let\bf@leftcurly=\{
\let\bf@rightcurly=\}
\newbox{\curly@box}
\def\store@rcurly#1#2{%
  \begingroup
    \bf@newdimen\curly@height
    \setlength{\curly@height}{#2 - \bf@rightcurlyshrinkage}%
    \bf@newdimen\half@curly@height
    \setlength{\half@curly@height}{0.5\curly@height}%
    \bf@newdimen\curly@shift
    \setlength{\curly@shift}{\bf@rightcurlyshrinkage}%
    \setlength{\curly@shift}{\half@curly@height + 0.5\curly@shift}%
    \global\sbox{#1}{\raisebox{\curly@shift}{%
      $\xdef\old@axis{\the\fontdimen22\textfont2}$%
      $\fontdimen22\textfont2=0pt%
       \left.
       \vrule height\half@curly@height
              width 0pt
              depth\half@curly@height\right\bf@rightcurly$%
      $\fontdimen22\textfont2=\old@axis$}}%
  \endgroup
}
\def\store@lcurly#1#2{%
  \begingroup
    \bf@newdimen\curly@height
    \setlength{\curly@height}{#2 - \bf@leftcurlyshrinkage}%
    \bf@newdimen\half@curly@height
    \setlength{\half@curly@height}{0.5\curly@height}%
    \bf@newdimen\curly@shift
    \setlength{\curly@shift}{\bf@leftcurlyshrinkage}%
    \setlength{\curly@shift}{\half@curly@height + 0.5\curly@shift}%
    \global\sbox{#1}{\raisebox{\curly@shift}{%
      $\xdef\old@axis{\the\fontdimen22\textfont2}$%
      $\fontdimen22\textfont2=0pt%
       \left\bf@leftcurly
       \vrule height\half@curly@height
              width 0pt
              depth\half@curly@height\right.$%
      $\fontdimen22\textfont2=\old@axis$}}%
  \endgroup
}
\def\show@wordlabelr{}
\newlength{\wordlabelr@start}
\newlength{\wordlabelr@end}
\newenvironment{rightwordgroup}[1]{%
  \endgroup
  \global\wordlabelr@start=\bytefield@height
  \gdef\wordlabelr@text{#1}%
  \ignorespaces
}{%
  \begingroup
  \global\wordlabelr@end=\bytefield@height
  \gdef\show@wordlabelr{%
    \sbox{\word@label@box}{%
      \begin{tabular}[b]{@{}l@{}}\wordlabelr@text\end{tabular}}%
    \settowidth{\label@box@width}{\usebox{\word@label@box}}%
    \setlength{\label@box@height}{\wordlabelr@end-\wordlabelr@start}%
    \store@rcurly{\curly@box}{\label@box@height}%
    \bf@newdimen\total@box@width
    \setlength{\total@box@width}{%
      \bf@rightcurlyspace +
      \widthof{\usebox{\curly@box}} +
      \bf@rightlabelspace +
      \label@box@width}%
    \begin{picture}(\strip@pt\total@box@width,0)
      \put(0,0){%
        \hspace*{\bf@rightcurlyspace}%
        \usebox{\curly@box}%
        \hspace*{\bf@rightlabelspace}%
        \makebox(\strip@pt\label@box@width,\strip@pt\label@box@height){%
          \usebox{\word@label@box}}}
    \end{picture}%
    \gdef\show@wordlabelr{}}%
  \def\@currenvir{rightwordgroup}%
  \ignorespaces
}
\newlength{\wordlabell@start}
\newlength{\wordlabell@end}
\newlength{\total@lbox@width}
\gdef\make@lspace{}
\newenvironment{leftwordgroup}[1]{%
  \endgroup
  \global\wordlabell@start=\bytefield@height
  \gdef\wordlabell@text{#1}%
  \sbox{\word@label@box}{%
    \begin{tabular}[b]{@{}l@{}}\wordlabell@text\end{tabular}}%
  \settowidth{\label@box@width}{\usebox{\word@label@box}}%
  \store@lcurly{\curly@box}{5cm}%
  \setlength{\total@lbox@width}{%
    \bf@leftcurlyspace +
    \widthof{\usebox{\curly@box}} +
    \bf@leftlabelspace +
    \label@box@width}%
  \global\total@lbox@width=\total@lbox@width
  \gdef\make@lspace{%
    \hspace*{\total@lbox@width}%
    \gdef\make@lspace{}}%
  \ignorespaces
}{%
  \begingroup
  \global\wordlabell@end=\bytefield@height
  \bf@newdimen\starting@point
  \setlength{\starting@point}{%
    -\total@lbox@width - \bf@bitwidth*\value{bits@wide}}%
  \sbox{\word@label@box}{%
    \begin{tabular}[b]{@{}l@{}}\wordlabell@text\end{tabular}}%
  \settowidth{\label@box@width}{\usebox{\word@label@box}}%
  \setlength{\label@box@height}{\wordlabell@end-\wordlabell@start}%
  \store@lcurly{\curly@box}{\label@box@height}%
  \begin{picture}(0,0)
    \put(\strip@pt\starting@point,0){%
      \makebox(\strip@pt\label@box@width,\strip@pt\label@box@height){%
        \usebox{\word@label@box}}%
      \hspace*{\bf@leftlabelspace}%
      \usebox{\curly@box}%
      \hspace*{\bf@leftcurlyspace}}
  \end{picture}%
  \def\@currenvir{leftwordgroup}%
  \ignorespaces}
\newlength{\label@box@width}
\newlength{\label@box@height}
\newsavebox{\word@label@box}
\newcommand{\bf@enter@compatibility@mode@i}{%
  \PackageInfo{bytefield}{Entering version 1 compatibility mode}%
  \newlength{\bitwidth}%
  \newlength{\byteheight}%
  \newlength{\curlyspace}%
  \newlength{\labelspace}%
  \newlength{\curlyshrinkage}%
  \settowidth{\bitwidth}{\tiny 99i}%
  \setlength{\byteheight}{4ex}%
  \setlength{\curlyspace}{1ex}%
  \setlength{\labelspace}{0.5ex}%
  \setlength{\curlyshrinkage}{5pt}%
  \let\newbytefield=\bytefield
  \let\endnewbytefield=\endbytefield
  \renewenvironment{bytefield}[1]{%
    \begin{newbytefield}[%
      bitwidth=\bitwidth,
      bitheight=\byteheight,
      curlyspace=\curlyspace,
      labelspace=\labelspace,
      curlyshrinkage=\curlyshrinkage]{##1}%
  }{%
    \end{newbytefield}%
  }
  \def\wordgroupr{\begin{rightwordgroup}}
  \def\endwordgroupr{\end{rightwordgroup}}
  \def\wordgroupl{\begin{leftwordgroup}}
  \def\endwordgroupl{\end{leftwordgroup}}
  \renewcommand{\bytefieldsetup}[1]{%
    \PackageError{bytefield}{%
      The \protect\bytefieldsetup\space macro is not available in\MessageBreak
      version 1 compatibility mode%
    }{%
      Remove [compat1] from the \protect\usepackage{bytefield} line to
      make \protect\bytefieldsetup\MessageBreak
      available to this document.\space\space (The document may also need
      to be modified to use\MessageBreak
      the new bytefield interface.)
    }%
  }%
}
\newcommand{\wordgroupr}{%
  \PackageError{bytefield}{%
    Macros \protect\wordgroupr, \protect\wordgroupl, \protect\endwordgroupr,
    \MessageBreak
    and \protect\endwordgroupl\space no longer exist%
  }{%
    Starting with version 2.0, bytefield uses \protect\begin{wordgroupr}...
    \MessageBreak
    \protect\end{wordgroupr} and \protect\begin{wordgroupl}...%
    \protect\end{wordgroupl}\MessageBreak
    to specify word groups and a new \protect\bytefieldsetup\space macro to
    \MessageBreak
    change bytefield's various formatting parameters.%
  }%
}
\let\endwordgroupr=\wordgroupr
\let\wordgroupl=\wordgroupr
\let\endwordgroupl=\wordgroupr
\define@key{bytefield}{bitwidth}{%
  \def\bf@bw@arg{#1}%
  \def\bf@auto{auto}%
  \ifx\bf@bw@arg\bf@auto
    \settowidth{\bf@bitwidth}{\bf@bitformatting{99i}}%
  \else
    \setlength{\bf@bitwidth}{#1}%
  \fi
}
\define@key{bytefield}{bitheight}{\setlength{\bf@bitheight}{#1}}
\define@key{bytefield}{bitformatting}{\def\bf@bitformatting{#1}}
\define@key{bytefield}{boxformatting}{\def\bf@boxformatting{#1}}
\define@key{bytefield}{leftcurly}{\def\bf@leftcurly{#1}}
\define@key{bytefield}{rightcurly}{\def\bf@rightcurly{#1}}
\define@key{bytefield}{leftcurlyspace}{\def\bf@leftcurlyspace{#1}}
\define@key{bytefield}{rightcurlyspace}{\def\bf@rightcurlyspace{#1}}
\define@key{bytefield}{curlyspace}{%
  \def\bf@leftcurlyspace{#1}%
  \def\bf@rightcurlyspace{#1}%
}
\define@key{bytefield}{leftlabelspace}{\def\bf@leftlabelspace{#1}}
\define@key{bytefield}{rightlabelspace}{\def\bf@rightlabelspace{#1}}
\define@key{bytefield}{labelspace}{%
  \def\bf@leftlabelspace{#1}%
  \def\bf@rightlabelspace{#1}%
}
\define@key{bytefield}{leftcurlyshrinkage}{\def\bf@leftcurlyshrinkage{#1}}
\define@key{bytefield}{rightcurlyshrinkage}{\def\bf@rightcurlyshrinkage{#1}}
\define@key{bytefield}{curlyshrinkage}{%
  \def\bf@leftcurlyshrinkage{#1}%
  \def\bf@rightcurlyshrinkage{#1}%
}
\newcommand{\bf@bytefieldsetup}{\setkeys{bytefield}}
\let\bytefieldsetup=\bf@bytefieldsetup
\DeclareOption{compat1}{\bf@enter@compatibility@mode@i}
\def\bf@package@options{}
\DeclareOption*{%
  \edef\next{%
    \noexpand\g@addto@macro\noexpand\bf@package@options{,\CurrentOption}%
  }%
  \next
}
\ProcessOptions\relax
\expandafter\bf@bytefieldsetup\expandafter{\bf@package@options}
\endinput
%%
%% End of file `bytefield.sty'.
