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%%% LaTeX support for TeXplorators / M. Spivak dvipaste program
%%% Copyright 1997 David Carlisle


% This program can redistributed and/or modified under the terms
% of the LaTeX Project Public License Distributed from CTAN
% archives in directory macros/latex/base/lppl.txt; either
% version 1 of the License, or (at your option) any later version.

%%% Usage notes in the file dvipaste.txt


\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{grfpaste}
          [1997/07/18 v0.2 dvipaste LaTeX graphics style (DPC)]

% 1997/07/17 v0.1
% 1997/07/18 v0.2  add ref system.

% To include previously prepared dvi fragments, use
% \usepackage{grfpaste}
% and include the graphics with \includegraphics{file.dvi}
% or \includegraphics[num=5]{file.dvi}
%
% To make a file that produces suitable fragments, use
% \usepackage[write]{grfpaste}
% and mark each fragment with \sendout{....}
% 
\DeclareOption{write}{\let\sendout\relax}
\DeclareOption{writepages}{\let\sendout\relax\let\GP@sendout\@empty}
\DeclareOption{include}{%
  \def\sendout#1{\PackageError{grfpaste}{Use write option}{}}}
\DeclareOption{defpaste}{\def\paste#1#2{\includegraphics[num=#2]{#1}}}
\DeclareOption*{\PassOptionsToPackage{\CurrentOption}{graphicx}}
\ExecuteOptions{include}
\ProcessOptions
\RequirePackage{graphicx}

\ifx\sendout\relax
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Marking DVI Sections For Inclusion In Other Files
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Size information will be written in to a file filename.dat
% which is opened now and closed at the end of the run.

\newwrite\writedata@
\immediate\openout\writedata@=\jobname.dat
%\AtEndDocument{\immediate\closeout\writedata@}

% The format of the .dat file is identical to that written by
% dvipaste.tex, the format of the dvi file is compatible.
% dvipaste uses a more complicated scheme that uses a custom output
% routine and then \eject each section, however I can't see why
% \sendout can not just \shipout the box directly, so that is what
% this version does.

\def\sendout{\@testopt\GP@sendout{}}

\ifx\GP@sendout\@empty

\def\GP@sendout[#1]#2{\PackageError{grfpaste}{write pages
    only}{}}

\let\GP@shipout\shipout
\def\shipout{\global\setbox\xxx}
\newbox\xxx
\let\GP@outputpage\@outputpage
\def\@outputpage{%
  \GP@outputpage
  \immediate\write\writedata@
      {\the\ht\xxx\space\the\dp\xxx\space\the\wd\xxx}%
  {\let\protect\noexpand
  \advance\c@page\m@ne
  \GP@shipout\hbox{%
    \special{beginpaste:}%
    \wd\xxx\z@
    \box\xxx
    \special{endpaste:}%
    }%
  }}

\else

\long\def\GP@sendout[#1]#2{%
  \sbox\z@{#2}%
  \immediate\write\writedata@
      {\the\ht\z@\space\the\dp\z@\space\the\wd\z@
        \ifx\box#1\box\else\space\@percentchar#1\fi}%
  \shipout\vbox{%
    \vskip\ht\z@
    \special{beginpaste:}%
    \ht\z@\z@\dp\z@\z@\wd\z@\z@
    \noindent\box\z@
    \special{endpaste:}%
% the original had this rule, but seems not to be needed.
%    \smash{\vrule \@height1sp\@width1sp\@depth\z@}%
    \@@par
    \vskip2pc%
    \hbox{\normalfont File [\jobname], \#\number\c@page}}%
  \stepcounter{page}}

\fi

\else
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Including DVI Sections Into The Current File
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Graphics will be able to include dvi file segments, reading size
% info from .dat files (compatible with dvipast.tex for plain tex)

\DeclareGraphicsRule{.dvi}{dvi}{.dat}{}

% Add .dvi to the default list of extensions.

\g@addto@macro\Gin@extensions{,.dvi}


% dvipaste allows multiple dvi fragments to be included from the
% same file. Add a new key num= (defaulting to 1) which says
% which bit to include. Maintaining numbers if you have a lot of
% fragments is inconvenient so may use symbolic references
% instead of number.
% ref=xxx refers to a fragment marked with the label xxx by use
% of an optional argument \sendout[xxx]{......} to \sendout.
% If \sendout is used with such an optional argument
% the fragment may be included either by number or by label.
% (The numeric form must be used if the fragment is included using
% dvipaste.tex's \paste command.)


\define@key{Gin}{num}{\def\Gin@num{#1}}
\define@key{Gin}{ref}{\def\Gin@ref{#1 }}
\setkeys{Gin}{num=1,ref=}

% Unlike other graphics formats, which only have natural height and
% width, dvipaste fragments are TeX boxes, with depth as well.
% add a new key to set the depth (for cases where you don't want to
% use a .dat file).

\define@key{Gin}{natdepth}{%
  \Gin@defaultbp\@tempaa{#1}%
  \Gin@nat@depth\@tempaa bp\relax}

% Ah. Don't look too carefully. The internal command \Gin@setfile
% in the kernel of the graphics package was not expecting this, and
% explicitly sets the depth of the graphic box to zero, so patch that
% to make it set it to the new \Gin@req@depth macro.
%
% pulls apart the macro at \dp\z@\z@ and then puts it all back together
% again.

\def\@tempa#1\dp\z@\z@#2!{%
  \def\Gin@setfile##1##2##3{%
    #1%
    \dp\z@\Gin@req@depth
    #2}}
\expandafter\@tempa\Gin@setfile{#1}{#2}{#3}!

% Scaling is not currently supported, so natural depth and
% required depth are the same.

\def\Gin@req@depth{\Gin@nat@depth}

\newdimen\Gin@nat@depth


% For each new file type the graphics package needs two functions.
% \Gread@&lt;type&gt; defines how to read the size information.
% \Ginclude@type defines how to set the actual box and specials.
% These functions are pretty similar to the code in dvipaste.tex

% as in the dvipaste.tex version, the size information for
% all the fragments in a single dvi file is saved in a macro
% so the file only needs to be read once.

\def\Gread@dvi#1{%
  \expandafter\let\expandafter\@tempb\csname Gread@#1\endcsname
  \ifx\@tempb\relax
  \let\@tempb\@empty
  \let\do\relax
  \immediate\openin\@inputcheck#1 %
  \catcode`\%9\relax
  \ifeof\@inputcheck
    \@latex@error{File `#1' not found}\@ehc
  \else
     \Gread@true
     \loop
       \read\@inputcheck to\@tempa
       \ifeof\@inputcheck
         \Gread@false
       \else
         \xdef\@tempb{\@tempb\do\@tempa\relax}%
       \fi
     \ifGread@
     \repeat
    \immediate\closein\@inputcheck
  \fi
  \global\expandafter\let\csname Gread@#1\endcsname\@tempb
  \fi
%
% Temporarily set \do to count up to the required fragment number
% and then grab the size info. Then execute the list (in \@tempb).
  \count@\z@
  \Gread@false
  \def\do##1 ##2 ##3 ##4\relax{%
    \advance\count@\@ne
    \def\@tempa{##4}%
    \ifx\@tempa\Gin@ref
      \edef\Gin@num{\the\count@}%
    \fi
    \ifnum\Gin@num=\count@
      \Gread@true
  \def\Gin@llx{0}%
  \let\Gin@lly\Gin@llx
  \Gin@defaultbp\Gin@urx{##3}%
  \Gin@defaultbp\Gin@ury{##1}%
       \Gin@nat@depth##2\relax
    \fi}%
  \@tempb
  \let\do\noexpand}

\def\Ginclude@dvi#1{%
  \ifGread@
    \dimen@\Gin@nat@height
    \advance\dimen@\Gin@nat@depth
    \hbox{\special{dvipaste: \Gin@base\space\Gin@num}% 
    \lower\Gin@nat@depth\vbox to\dimen@{\hbox to\Gin@nat@width{}\vfil}}%
  \else
    \Gin@nosize{\Gin@base[\Gin@num]}%
  \fi}


\fi

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