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DV2DT(1)                                                              DV2DT(1)



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  pro-
       gram 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  val-
       ues are always represented in two's complement arithmetic, which is the system followed by most computers manu-
       factured 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.TobinATee.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: <beebeATmath.edu>



Version 0.6.0                    08 March 1995                        DV2DT(1)