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``dvi.doc''
Mon 27 Feb 1995
Geoffrey Tobin

Description of the DVI file structure.
--------------------------------------

Reference:
----------

        CTAN:  dviware/driv-standard/level-0/dvistd0.tex

    "The DVI Driver Standard, Level 0",
    by  The TUG DVI Driver Standards Committee  (now defunct)
    chaired by Joachim Schrod.
    Appendix A, "Device-Independent File Format",
    section A.2, "Summary of DVI commands".


DVI Commands
------------
Listed in the free format:
"Opcode  Symbol  Parameter[Signed? Bytes]  ...  Action".

    
    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
    135  put3  c[3]   -  put 3-byte uchar
    136  put4  c[+4]  -  put 4-byte schar

    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
    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
    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

    248  post  p[4] num[4] den[4] mag[4] l[4] u[4] s[2] t[2]  -  begin postamble
    249  post_post  q[4] i[1] 223 ... 223                     -  end postamble

    250  -  undefined
    ...
    255  -  undefined

In bop:

    c0[+4] ... c9[+4]  =  page counters, \`a la TeX.
    p[+4]  =  pointer to previous bop (its byte address); first bop has p = -1 .

In the font definitions:

    c[4]  =  check sum for TFM file.
    s[4]  =  scale factor, in DVI units.
    d[4]  =  design size, in DVI units.
    a[1]  =  length of the "area" or directory.
    l[1]  =  length of the font name.
    n[a+l]  =  area and font name string(s).

In the preamble:

    i[1]  =  DVI format ID  =  2, except  TeX-XeT  has  3.
    num[4]  =  numerator   of 100 nm / DVI unit.
    den[4]  =  denominator of 100 nm / DVI unit.
    mag[4]  =  1000 * magnification.
    k[1]  =  comment length.
    x[k]  =  comment string.

In the postamble:

    p[4]  =  pointer to final bop.
    num[4], den[4], mag[4]  =  duplicates of values in preamble.
    l[4]  =  height-plus-depth of tallest page, in DVI units.
    u[4]  =  width of widest page, in DVI units.
    s[2]  =  maximum stack depth needed to process this DVI file.
    t[2]  =  total number of pages (bop commands) present.

In the post-postamble:

    q[4]  =  pointer to the "post" command that started the postamble.
    i[1]  =  DVI format ID, as in the preamble.
    223 ... 223  =  at least four "223" bytes.

---------------
EOF ``dvi.doc''
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