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NAME

       dv2dt - convert a binary TeX DVI file to DTL text representation

SYNOPSIS

       dv2dt input-DVI-file output-DTL-file

       If the filenames are omitted, then stdin and stdout are assumed.

DESCRIPTION

       dv2dt  converts  a binary TeX DVI file to an editable text file in DTL (DVI Text Language)
       format.  The companion dt2dv(1) utility can convert the DTL file  back  to  a  binary  DVI
       file.

DVI COMMAND DESCRIPTION

       TeX  DVI  files  contain  a  compact  binary  description of typeset pages, as a stream of
       operation code bytes, each immediately followed by zero  or  more  parameter  bytes.   The
       format  of  DVI  files  is  fully described in Donald E. Knuth, TeX: The Program, Addison-
       Wesley (1986), ISBN 0-201-13437-3, as well as in the dvitype(1)  literate  program  source
       code.

       For  convenience,  we  provide  a  summary  of  DVI commands here.  In the following list,
       operation code bytes are given as unsigned decimal  values,  followed  by  their  symbolic
       names  (not  present  in the DVI file), and a short description.  A designation like b[+n]
       means that the operation code byte is followed by a parameter b which uses n bytes, and is
       signed.   Without  the  plus  sign,  the  parameter is unsigned.  Signed integer parameter
       values are always represented in two's complement arithmetic, which is the system followed
       by most computers manufactured today, including all personal computers and workstations.

       0 set_char_0     Set character 0 from current font.

       ...

       127 set_char_127 Set character 127 from current font.

       128 set1  c[1]   Set 1-byte unsigned character (uchar) number c.

       129 set2  c[2]   Set 2-byte uchar number c.

       130 set3  c[3]   Set 3-byte uchar number c.

       131 set4  c[+4]  Set 4-byte signed character (schar) number c.

       132 set_rule  a[+4]  b[+4]
                        Set rule, height a, width b.

       133 put1  c[1]   Put 1-byte uchar c.

       134 put2  c[2]   Put 2-byte uchar c.

       135 put3  c[3]   Put 3-byte uchar c.

       136 put4  c[+4]  Put 4-byte schar c.

       137 put_rule  a[+4]  b[+4]
                        Put rule, height a, width b.

       138 nop          Do nothing.

       139 bop  c0[+4]  ...  c9[+4]  p[+4]
                        Beginning of page.  The parameters c0  ...  c9 are the TeX page counters,
                        the contents of TeX count registers \count0  ...  \count9.  The parameter
                        p  is  the byte offset from the beginning of the DVI file of the previous
                        bop operation code byte.  The first such command in the file has p = -1.

       140 eop          End of page.

       141 push         Push (h,v,w,x,y,z) onto stack.

       142 pop          Pop (h,v,w,x,y,z) from stack.

       143 right1  b[+1]
                        Move right b units.

       144 right2  b[+2]
                        Move right b units.

       145 right3  b[+3]
                        Move right b units.

       146 right4  b[+4]
                        Move right b units.

       147 w0           Move right w units.

       148 w1  b[+1]    Move right b units, and set w = b.

       149 w2  b[+2]    Move right b units, and set w = b.

       150 w3  b[+3]    Move right b units, and set w = b.

       151 w4  b[+4]    Move right b units, and set w = b.

       152 x0           Move right x units.

       153 x1  b[+1]    Move right b units, and set x = b.

       154 x2  b[+2]    Move right b units, and set x = b.

       155 x3  b[+3]    Move right b units, and set x = b.

       156 x4  b[+4]    Move right b units, and set x = b.

       157 down1  a[+1] Move down a units.

       158 down2  a[+2] Move down a units.

       159 down3  a[+3] Move down a units.

       160 down4  a[+4] Move down a units.

       161 y0           Move right y units.

       162 y1  a[+1]    Move right a units, and set y = a.

       163 y2  a[+2]    Move right a units, and set y = a.

       164 y3  a[+3]    Move right a units, and set y = a.

       165 y4  a[+4]    Move right a units, and set y = a.

       166 z0           Move right z units.

       167 z1  a[+1]    Move right a units, and set z = a.

       168 z2  a[+2]    Move right a units, and set z = a.

       169 z3  a[+3]    Move right a units, and set z = a.

       170 z4  a[+4]    Move right a units, and set z = a.

       171 fnt_num_0    Set current font number (f) = 0.

       ...

       234 fnt_num_63   Set f = 63.

       235 fnt1  k[1]   Set f = k.

       236 fnt2  k[2]   Set f = k.

       237 fnt3  k[3]   Set f = k.

       238 fnt4  k[+4]  Set f = k.

       239 xxx1  k[1]  x[k]
                        Special string x with k bytes.

       240 xxx2  k[2]  x[k]
                        Special string x with k bytes.

       241 xxx3  k[3]  x[k]
                        Special string x with k bytes.

       242 xxx4  k[4]  x[k]
                        Special string x with (unsigned) k bytes.

       243 fnt_def1  k[1] c[4] s[4] d[4] a[1] l[1] n[a+l]
                        Define font k.  The parameters are:

                        c   Checksum for TFM file.

                        s   Scale factor, in DVI units.

                        d   Design size, in DVI units.

                        a   Length of the ``area'' or directory.

                        l   Length of the font name.

                        n   Area and font name string(s).

       244 fnt_def2  k[2] c[4] s[4] d[4] a[1] l[1] n[a+l]
                        Define font k.

       245 fnt_def3  k[3] c[4] s[4] d[4] a[1] l[1] n[a+l]
                        Define font k.

       246 fnt_def4  k[+4] c[4] s[4] d[4] a[1] l[1] n[a+l]
                        Define font k.

       247 pre  i[1]  num[4]  den[4]  mag[4]  k[1]  x[k]
                        Begin preamble.  The parameters are:

                        i     DVI format.  Standard TeX has ID = 2, and TeX-XeT has ID = 3.

                        num   Numerator of 100 nm / DVI unit.

                        den   Denominator of 100 nm / DVI unit.

                        mag   1000 * magnification.

                        k     Comment length.

                        x     Comment string.

       248 post  p[4] num[4] den[4] mag[4] l[4] u[4] s[2] t[2]
                        Begin postamble.  The parameters are:

                        p     Pointer to final bop.

                        num, den, mag
                              Duplicates of values in preamble.

                        l     Height-plus-depth of tallest page, in DVI units.

                        u     Width of widest page, in DVI units.

                        s     Maximum stack depth needed to process this DVI file.

                        t     Total number of pages (bop commands) present.

       249 post_post  q[4] i[1] 223 ... 223
                        End postamble.  The parameters are:

                        q     Byte offset from the beginning of the DVI file to the post  command
                              that started the postamble.

                        i     DVI format ID, as in the preamble.

                        223   At least four 223 bytes.

       250              Undefined.

       ...

       255              Undefined.

DTL COMMAND DESCRIPTION

       A  DTL file contains one line per command, with a limit of 1024 characters per line.  Each
       command contains a symbolic operation name, followed by zero  or  more  parameter  values.
       The  parameter value descriptions are not repeated here; they can be found in the previous
       section.

       variety <variety-name>
                            This command specifies the name of the DTL file type; it has  no  DVI
                            file equivalent.

       (text)               Series of set_char commands, for printable ASCII text.

       \(                   Literal ASCII left parenthesis in (text).

       \)                   Literal ASCII right parenthesis in (text).

       \\                   Literal ASCII backslash in (text).

       \"                   Literal ASCII double quote in (text).

       \XY                  Set_char  for character with hexadecimal code XY, not in parentheses,
                            but by itself for readability.

       s1, s2, s2, s3       Set, with (1,2,3,4)-byte charcodes.

       sr                   set_rule.

       p1, p2, p2, p3       Put, with (1,2,3,4)-byte charcodes.

       pr                   put_rule.

       nop                  nop (do nothing).

       bop                  bop (beginning of page).

       eop                  eop (end of page).

       [                    Push.

       ]                    Pop.

       r1, r2, r3, r4       Right, with (1,2,3,4)-byte argument.

       w0, w1, w2, w3, w4   As in DVI.

       x0, x1, x2, x3, x4   As in DVI.

       d1, d2, d3, d4       Down, with (1,2,3,4)-byte argument.

       y0, y1, y2, y3, y4   As in DVI.

       z0, z1, z2, z3, z4   As in DVI.

       fn                   fnt_num (set current font to font number in 0 to 63).

       f1, f2, f3, f4       fnt (set current font to (1,2,3,4)-byte font number).

       special              xxx (special commands with (1,2,3,4)-byte string length).

       fd                   fnt_def (assign a number to a named font).

       pre                  Preamble.

       post                 post (begin postamble).

       post_post            post_post (end postamble).

       opcode               Undefined DVI command (250 to 255).

SAMPLE DTL FILE

       The following 2-line TeX file
              Hello.
              \bye
       when processed with the commands
              tex hello.tex
              dv2dt hello.dvi hello.dtl
       produces this DTL file:
              variety sequences-6
              pre 2 25400000 473628672 1000 27 ' TeX output 1995.03.02:2334'
              bop 1 0 0 0 0 0 0 0 0 0 -1
              [
              d3 -917504
              ]
              d4 42152922
              [
              d4 -41497562
              [
              r3 1310720
              fd1 0 11374260171 655360 655360 0 5 '' 'cmr10'
              fn0
              (Hello.)
              ]
              ]
              d3 1572864
              [
              r4 15229091
              (1)
              ]
              eop
              post 42 25400000 473628672 1000 43725786 30785863 2 1
              fd1 0 11374260171 655360 655360 0 5 'cmr10'
              post_post 152 2 223 223 223 223
       The command
              dt2dv hello.dtl hello.dvi
       will reconstruct the original DVI file.

SEE ALSO

       dt2dv(1), dvitype(1), tex(1).

FILES

       *.dvi   binary TeX DVI file.

       *.dtl   text representation of a TeX DVI file in DVI Text Language format.

AUTHOR

       dv2dt and dt2dv(1) were written by
              Geoffrey Tobin
              Department of Electronic Engineering
              La Trobe University
              Bundoora, Victoria 3083
              Australia
              Tel: +61 3 479 3736
              FAX: +61 3 479 3025
              Email: <G.Tobin@ee.latrobe.edu.au>

       These manual pages were primarily written by
              Nelson H. F. Beebe, Ph.D.
              Center for Scientific Computing
              Department of Mathematics
              University of Utah
              Salt Lake City, UT 84112
              Tel: +1 801 581 5254
              FAX: +1 801 581 4148
              Email: <beebe@math.utah.edu>