LaTeX format for LuaMetaTeX
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local readfile = require'luametalatex-readfile'
local fontcmds = {
[243] = ">I1I4I4I4BB",
[244] = ">I2I4I4I4BB",
[245] = ">I3I4I4I4BB",
[246] = ">I4I4I4I4BB",
}
local function read_fonts(buf, i, fonts, size)
local cmd = fontcmds[string.byte(buf, i)]
if not cmd then return i end
local fid, check, scale, designsize, arealen, namelen, i =
string.unpack(cmd, buf, i + 1)
fid = fid + 1 -- We prefer 1-based arrays
local fsize = size * scale >> 20
if fonts[fid] then error[[font number reused in VF file]] end
fonts[fid] = {
area = arealen > 0 and string.sub(buf, i, i+arealen-1) or nil,
name = string.sub(buf, i+arealen, i+arealen+namelen-1),
size = fsize,
designsize = designsize >> 4,
checksum = check,
}
return read_fonts(buf, i+arealen+namelen, fonts, size)
end
local Cmds = {
[1] = ">I1",
[2] = ">I2",
[3] = ">I3",
[4] = ">I4",
}
local cmds = {
[1] = ">i1",
[2] = ">i2",
[3] = ">i3",
[4] = ">i4",
}
local xxx = {
[239] = ">s1",
[240] = ">s2",
[241] = ">s3",
[242] = ">s4",
}
local function read_chars(buf, i, characters, size)
local cmd = string.byte(buf, i)
if cmd > 242 then return i end
local code, tfmwidth
if cmd == 242 then
cmd, code, tfmwidth, i = string.unpack(">I4I4I4", buf, i + 1)
else
code, tfmwidth, i = string.unpack(">BI3", buf, i + 1)
end
local commands = {}
local character = {
width = tfmwidth, -- Unscaled for compatibility with LuaTeX
commands = commands,
}
characters[code] = character
local after = i + cmd
local w, x, y, z, stack = 0, 0, 0, 0, {}
while i < after do
local cmd = string.byte(buf, i)
if cmd <= 131 then
if cmd >= 128 then
cmd, i = string.unpack(Cmds[cmd-127], buf, i + 1)
else
i = i + 1
end
commands[#commands + 1] = { "char", cmd }
elseif cmd == 132 then
local height, width
height, width, i = string.unpack(">I4I4", buf, i + 1)
commands[#commands + 1] =
{ "rule", height * size >> 20, width * size >> 20 }
elseif cmd <= 136 then
cmd, i = string.unpack(Cmds[cmd-132], buf, i + 1)
commands[#commands + 1] = { "push" }
commands[#commands + 1] = { "char", cmd }
commands[#commands + 1] = { "pop" }
elseif cmd == 137 then
local height, width
height, width, i = string.unpack(">I4I4", buf, i + 1)
commands[#commands + 1] = { "push" }
commands[#commands + 1] =
{ "rule", height * size >> 20, width * size >> 20 }
commands[#commands + 1] = { "pop" }
elseif cmd == 138 then -- NOP
i = i + 1
elseif cmd <= 140 then
error[[Invalid command in packet]]
elseif cmd == 141 then
stack[#stack+1] = {w, x, y, z}
commands[#commands + 1] = { "push" }
i = i + 1
elseif cmd == 142 then
local top = stack[#stack]
if not top then error[[Attempt to pop with empty stack]] end
stack[#stack] = nil
w, x, y, z = top[1], top[2], top[3], top[4]
commands[#commands + 1] = { "pop" }
i = i + 1
elseif cmd <= 146 then
cmd, i = string.unpack(cmds[cmd-142], buf, i + 1)
commands[#commands + 1] = { "right", (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0) }
elseif cmd == 147 then
commands[#commands + 1] = { "right", w }
i = i + 1
elseif cmd <= 151 then
cmd, i = string.unpack(cmds[cmd-147], buf, i + 1)
w = (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0)
commands[#commands + 1] = { "right", w }
elseif cmd == 152 then
commands[#commands + 1] = { "right", x }
i = i + 1
elseif cmd <= 156 then
cmd, i = string.unpack(cmds[cmd-152], buf, i + 1)
x = (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0)
commands[#commands + 1] = { "right", x }
elseif cmd <= 160 then
cmd, i = string.unpack(cmds[cmd-156], buf, i + 1)
commands[#commands + 1] = { "down", (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0) }
elseif cmd == 161 then
commands[#commands + 1] = { "down", y }
i = i + 1
elseif cmd <= 165 then
cmd, i = string.unpack(cmds[cmd-161], buf, i + 1)
y = (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0)
commands[#commands + 1] = { "down", y }
elseif cmd == 166 then
commands[#commands + 1] = { "down", z }
i = i + 1
elseif cmd <= 170 then
cmd, i = string.unpack(cmds[cmd-166], buf, i + 1)
z = (cmd * size >> 20) | (cmd < 0 and 0xFFFFFFFF00000000 or 0)
commands[#commands + 1] = { "down", z }
elseif cmd <= 238 then
if cmd >= 235 then
cmd, i = string.unpack(Cmds[cmd-234], buf, i + 1)
else
cmd, i = cmd - 171, i + 1
end
commands[#commands + 1] = { "font", cmd + 1 } -- 1-based fonts
elseif xxx[cmd] then
cmd, i = string.unpack(xxx[cmd], buf, i + 1)
commands[#commands + 1] = { "special", cmd }
else
error[[Invalid command in packet]]
end
end
if i > after then error[[Ill-formed packet]] end
return read_chars(buf, after, characters, size)
end
local function parse_vf(buf, i, size)
local font = {}
local magic, designsize
magic, font.header, font.checksum, designsize, i =
string.unpack(">Hs1I4I4", buf, i)
if magic ~= 247*256+202 then error[[Not a VF file]] end
font.designsize = designsize >> 4
local fonts, characters = {}, {}
font.fonts, font.characters = fonts, characters
i = read_fonts(buf, i, fonts, size)
i = read_chars(buf, i, characters, size)
return font
end
local basename = ((1-lpeg.S'\\/')^0*lpeg.S'\\/')^0*lpeg.C((1-lpeg.P'.tfm'*-1)^0)
return function(name, size, must_exist)
local file <close> = readfile('vf', name)
if not file then return end
local result = parse_vf(file(), 1, size)
result.name = basename:match(name)
return result
end