594 lines
20 KiB
Lua
594 lines
20 KiB
Lua
local readfile = require'luametalatex-readfile'
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local sfnt = require'luametalatex-font-sfnt'
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local stdStrings = require'luametalatex-font-cff-data'
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local offsetfmt = ">I%i"
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local function parse_index(buf, i)
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local count, offsize
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count, offsize, i = string.unpack(">I2B", buf, i)
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if count == 0 then return {}, i-1 end
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local fmt = offsetfmt:format(offsize)
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local offsets = {}
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local dataoffset = i + offsize*count - 1
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for j=1,count+1 do
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offsets[j], i = string.unpack(fmt, buf, i)
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end
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for j=1,count+1 do
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offsets[j] = offsets[j] + i - 1
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end
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return offsets, offsets[#offsets]
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end
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local real_mapping = { [0] = '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'.', 'E', 'E-', nil, '-', nil}
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local function parse_real(cs, offset)
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local c = cs:byte(offset)
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if not c then return offset end
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local c1, c2 = real_mapping[c>>4], real_mapping[c&0xF]
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if not c1 or not c2 then
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return c1 or offset, c1 and offset
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else
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return c1, c2, parse_real(cs, offset+1) --Warning: This is not a tail-call,
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-- so we are affected by the stack limit. On the other hand, as long as
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-- there are less than ~50 bytes we should be safe.
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end
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end
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local function get_number(result)
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if #result ~= 1 then
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print(require'inspect'(result))
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end
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assert(#result == 1)
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local num = result[1]
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result[1] = nil
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return num
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end
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local function get_bool(result)
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return get_number(result) == 1
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end
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local function get_string(result, strings)
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local sid = get_number(result)
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return stdStrings[sid] or strings[sid-#stdStrings]
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end
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local function get_array(result)
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local arr = table.move(result, 1, #result, 1, {})
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for i=1,#result do result[i] = nil end
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return arr
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end
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local function get_delta(result)
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local arr = get_array(result)
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local last = 0
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for i=1,#arr do
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arr[i] = arr[i]+last
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last = arr[i]
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end
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return arr
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end
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local function get_private(result)
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local arr = get_array(result)
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assert(#arr == 2)
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return arr
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end
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local function get_ros(result, strings)
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local arr = get_array(result)
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assert(#arr == 3)
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result[1] = arr[1] arr[1] = get_string(result, strings)
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result[1] = arr[2] arr[2] = get_string(result, strings)
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return arr
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end
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local function apply_matrix(m, x, y)
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return (m[1] * x + m[3] * y + m[5])*1000, (m[2] * x + m[4] * y + m[6])*1000
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end
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local operators = {
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[0] = {'version', get_string},
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{'Notice', get_string},
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{'FullName', get_string},
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{'FamilyName', get_string},
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{'Weight', get_string},
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{'FontBBox', get_array},
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{'BlueValues', get_delta},
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{'OtherBlues', get_delta},
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{'FamilyBlues', get_delta},
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{'FamilyOtherBlues', get_delta},
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{'StdHW', get_number},
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{'StdVW', get_number},
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nil, -- 12, escape
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{'UniqueID', get_number},
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{'XUID', get_array},
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{'charset', get_number},
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{'Encoding', get_number},
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{'CharStrings', get_number},
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{'Private', get_private},
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{'Subrs', get_number},
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{'defaultWidthX', get_number},
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{'nominalWidthX', get_number},
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[-1] = {'Copyright', get_string},
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[-2] = {'isFixedPitch', get_bool},
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[-3] = {'ItalicAngle', get_number},
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[-4] = {'UnderlinePosition', get_number},
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[-5] = {'UnderlineThickness', get_number},
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[-6] = {'PaintType', get_number},
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[-7] = {'CharstringType', get_number},
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[-8] = {'FontMatrix', get_array},
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[-9] = {'StrokeWidth', get_number},
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[-10] = {'BlueScale', get_number},
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[-11] = {'BlueShift', get_number},
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[-12] = {'BlueFuzz', get_number},
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[-13] = {'StemSnapH', get_delta},
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[-14] = {'StemSnapV', get_delta},
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[-15] = {'ForceBold', get_bool},
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[-18] = {'LanguageGroup', get_number},
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[-19] = {'ExpansionFactor', get_number},
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[-20] = {'initialRandomSeed', get_number},
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[-21] = {'SyntheticBase', get_number},
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[-22] = {'PostScript', get_string},
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[-23] = {'BaseFontName', get_string},
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[-24] = {'BaseFontBlend', get_delta},
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[-31] = {'ROS', get_ros},
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[-32] = {'CIDFontVersion', get_number},
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[-33] = {'CIDFontRevision', get_number},
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[-34] = {'CIDFontType', get_number},
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[-35] = {'CIDCount', get_number},
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[-36] = {'UIDBase', get_number},
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[-37] = {'FDArray', get_number},
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[-38] = {'FDSelect', get_number},
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[-39] = {'FontName', get_string},
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}
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local function parse_dict(buf, i, j, strings)
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result = {}
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while i<=j do
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local cmd = buf:byte(i)
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if cmd == 29 then
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result[#result+1] = string.unpack(">i4", buf:sub(i+1, i+4))
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i = i+4
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elseif cmd == 28 then
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result[#result+1] = string.unpack(">i2", buf:sub(i+1, i+2))
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i = i+2
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elseif cmd >= 251 then -- Actually "and cmd ~= 255", but 255 is reserved
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result[#result+1] = -((cmd-251)*256)-string.byte(buf, i+1)-108
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i = i+1
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elseif cmd >= 247 then
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result[#result+1] = (cmd-247)*256+string.byte(buf, i+1)+108
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i = i+1
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elseif cmd >= 32 then
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result[#result+1] = cmd-139
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elseif cmd == 30 then -- 31 is reserved again
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local real = {parse_real(buf, i+1)}
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i = real[#real]
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real[#real] = nil
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result[#result+1] = tonumber(table.concat(real))
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else
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if cmd == 12 then
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i = i+1
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cmd = -buf:byte(i)-1
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end
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local op = operators[cmd]
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if not op then error[[Unknown CFF operator]] end
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result[op[1]] = op[2](result, strings)
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end
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i = i+1
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end
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return result
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end
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local function parse_charstring(cs, globalsubrs, subrs, result)
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result = result or {{false}, stemcount = 0}
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local lastresult = result[#result]
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local i = 1
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while i~=#cs+1 do
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local cmd = cs:byte(i)
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if cmd == 28 then
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lastresult[#lastresult+1] = string.unpack(">i2", cs:sub(i+1, i+2))
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i = i+2
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elseif cmd == 255 then
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lastresult[#lastresult+1] = string.unpack(">i4", cs:sub(i+1, i+4))/0x10000
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i = i+4
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elseif cmd >= 251 then
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lastresult[#lastresult+1] = -((cmd-251)*256)-string.byte(cs, i+1)-108
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i = i+1
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elseif cmd >= 247 then
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lastresult[#lastresult+1] = (cmd-247)*256+string.byte(cs, i+1)+108
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i = i+1
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elseif cmd >= 32 then
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lastresult[#lastresult+1] = cmd-139
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elseif cmd == 10 then
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local idx = lastresult[#lastresult]+subrs.bias
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local subr = subrs[idx]
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subrs.used[idx] = true
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lastresult[#lastresult] = nil
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parse_charstring(subr, globalsubrs, subrs, result)
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lastresult = result[#result]
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elseif cmd == 29 then
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local idx = lastresult[#lastresult]+globalsubrs.bias
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local subr = globalsubrs[idx]
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globalsubrs.used[idx] = true
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lastresult[#lastresult] = nil
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parse_charstring(subr, globalsubrs, subrs, result)
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lastresult = result[#result]
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elseif cmd == 11 then
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break -- We do not keep subroutines, so drop returns and continue with the outer commands
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elseif cmd == 12 then
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i = i+1
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cmd = cs:byte(i)
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lastresult[1] = -cmd-1
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lastresult = {false}
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result[#result+1] = lastresult
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elseif cmd == 19 or cmd == 20 then
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if #result == 1 then
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lastresult = {}
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result[#result+1] = lastresult
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end
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lastresult[1] = cmd
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local newi = i+(result.stemcount+7)//8
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lastresult[2] = cs:sub(i+1, newi)
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i = newi
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else
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if cmd == 21 and #result == 1 then
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table.insert(result, 1, {false})
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if #lastresult == 4 then
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result[1][2] = lastresult[2]
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table.remove(lastresult, 2)
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end
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elseif (cmd == 4 or cmd == 22) and #result == 1 then
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table.insert(result, 1, {false})
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if #lastresult == 3 then
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result[1][2] = lastresult[2]
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table.remove(lastresult, 2)
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end
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elseif cmd == 14 and #result == 1 then
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table.insert(result, 1, {false})
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if #lastresult == 2 or #lastresult == 6 then
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result[1][2] = lastresult[2]
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table.remove(lastresult, 2)
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end
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elseif cmd == 1 or cmd == 3 or cmd == 18 or cmd == 23 then
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if #result == 1 then
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table.insert(result, 1, {false})
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if #lastresult % 2 == 0 then
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result[1][2] = lastresult[2]
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table.remove(lastresult, 2)
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end
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end
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result.stemcount = result.stemcount + #lastresult//2
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end
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lastresult[1] = cmd
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lastresult = {false}
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result[#result+1] = lastresult
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end
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i = i+1
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end
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return result
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end
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local function parse_charset(buf, i0, offset, strings, num)
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if not offset then offset = 0 end
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if offset == 0 then
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return ISOAdobe
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elseif offset == 1 then
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return Expert
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elseif offset == 2 then
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return ExpertSubset
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else offset = i0+offset end
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local format
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format, offset = string.unpack(">B", buf, offset)
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local charset = {[0] = 0}
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if format == 0 then
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for i=1,num-1 do
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charset[i], offset = string.unpack(">I2", buf, offset)
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end
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elseif format == 1 then
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local i = 1
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while i < num do
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local first, nLeft
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first, nLeft, offset = string.unpack(">I2I1", buf, offset)
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for j=0,nLeft do
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charset[i+j] = first+j
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end
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i = i+1+nLeft
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end
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elseif format == 2 then
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local i = 1
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while i < num do
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local first, nLeft
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first, nLeft, offset = string.unpack(">I2I2", buf, offset)
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for j=0,nLeft do
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charset[i+j] = first+j
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end
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i = i+1+nLeft
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end
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else
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error[[Invalid Charset format]]
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end
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if strings then -- We are not CID-keyed, so we should use strings instead of numbers
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local string_charset = {}
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for i=#charset,0,-1 do
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local sid = charset[i]
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charset[i] = nil
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string_charset[i] = stdStrings[sid] or strings[sid-#stdStrings]
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end
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charset = string_charset
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end
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return charset
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end
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local function parse_encoding(buf, i0, offset, CharStrings)
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if not offset then offset = 0 end
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if offset == 0 then
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error[[TODO]]
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return "StandardEncoding"
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elseif offset == 1 then
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error[[TODO]]
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return "ExpertEncoding"
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else offset = i0+offset end
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local format, num
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format, num, offset = string.unpack(">BB", buf, offset)
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local encoding = {}
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if format == 0 then
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for i=1,num do
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local code
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code, offset = string.unpack(">B", buf, offset)
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encoding[code] = CharStrings[i]
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end
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elseif format == 1 then
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local i = 1
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while i <= num do
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local first, nLeft
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first, nLeft, offset = string.unpack(">BB", buf, offset)
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for j=0,nLeft do
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encoding[first + j] = CharStrings[i + j]
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end
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i = i+1+nLeft
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end
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else
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error[[Invalid Encoding format]]
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end
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return encoding
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end
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local function parse_fdselect(buf, offset, CharStrings)
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local format
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format, offset = string.unpack(">B", buf, offset)
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if format == 0 then
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for i=1,#CharStrings-1 do
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local code
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code, offset = string.unpack(">B", buf, offset)
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CharStrings[i][3] = code + 1
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end -- Reimplement with string.byte
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elseif format == 3 then
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local count, last
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count, offset = string.unpack(">I2", buf, offset)
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for i=1,count do
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local first, code, after = string.unpack(">I2BI2", buf, offset)
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for j=first, after-1 do
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CharStrings[j][3] = code + 1
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end
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offset = offset + 3
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end
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else
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error[[Invalid FDSelect format]]
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end
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end
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local function applyencoding(buf, i, usedcids, encoding)
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local usednames = {}
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local numglyphs
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numglyphs, i = string.unpack(">I2", buf, i)
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local stroffset = 2*numglyphs + i
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local names = setmetatable({}, {__index = function(t, i)
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for j=#t+1,i do
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t[j], stroffset = string.unpack("s1", buf, stroffset)
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end
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return t[i]
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end})
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local newusedcids = {}
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for j=1,#usedcids do
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local name = encoding[usedcids[j][1]]
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if name then
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local new = {old = usedcids[j]}
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usednames[name], newusedcids[j] = new, new
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else
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newusedcids[j] = {j} -- FIXME: Someone used a character which does not exists in the encoding.
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-- This should probably at least trigger a warning.
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end
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end
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for j=1,numglyphs do
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local name
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name, i = string.unpack(">I2", buf, i)
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if name < 258 then
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name = stdnames[name]
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else
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name = names[name-257]
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end
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if usednames[name] then
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usednames[name][1] = j-1
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usednames[name] = nil
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end
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end
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if next(usednames) then
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error[[Missing character]]
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end
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return newusedcids
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end
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-- The encoding parameter might be:
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-- an encoding dictionary - Use the supplied encoding
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-- true - Use the build-in encoding
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-- false - Use GIDs
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-- nil - Use CIDs, falling back to GIDs in name.based fonts
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function myfunc(buf, i0, fontid, usedcids, encoding, trust_widths)
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-- return function(filename, fontid)
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fontid = fontid or 1
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local major, minor, hdrSize, offSize = string.unpack(">BBBB", buf, i0)
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if major ~= 1 then error[[Unsupported CFF version]] end
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-- local offfmt = offsetfmt:format(offSize)
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local nameoffsets, topoffsets, stringoffsets, globalsubrs
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local i = i0+hdrSize
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nameoffsets, i = parse_index(buf, i)
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topoffsets, i = parse_index(buf, i)
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stringoffsets, i = parse_index(buf, i)
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globalsubrs, i = parse_index(buf, i)
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local strings = {}
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for j=1,#stringoffsets-1 do
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strings[j] = buf:sub(stringoffsets[j], stringoffsets[j+1]-1)
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end
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if #nameoffsets ~= #topoffsets then error[[Inconsistant size of FontSet]] end
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if fontid >= #nameoffsets then error[[Invalid font id]] end
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local top = parse_dict(buf, topoffsets[fontid], topoffsets[fontid+1]-1, strings)
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top.FontName = buf:sub(nameoffsets[fontid], nameoffsets[fontid+1]-1)
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local gsubrsdict = {}
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for i=1,#globalsubrs-1 do
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gsubrsdict[i] = buf:sub(globalsubrs[i], globalsubrs[i+1]-1)
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end
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gsubrsdict.used = {}
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gsubrsdict.bias = #gsubrsdict < 1240 and 108 or #gsubrsdict < 33900 and 1132 or 32769
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top.GlobalSubrs = gsubrsdict
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local CharStrings = parse_index(buf, i0+top.CharStrings)
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if not not encoding ~= encoding and (encoding or top.ROS) then -- If we use the build-in encoding *or* GIDs, we do not need to waste our time making sense of the charset
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local charset = parse_charset(buf, i0, top.charset, not top.ROS and strings, #CharStrings-1)
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named_charstrings = {}
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for i=1,#CharStrings-1 do
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named_charstrings[charset[i-1]] = {CharStrings[i], CharStrings[i+1]-1}
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end
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CharStrings = named_charstrings
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else
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for i=1,#CharStrings-1 do
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CharStrings[i-1] = {CharStrings[i], CharStrings[i+1]-1}
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end
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CharStrings[#CharStrings] = nil
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CharStrings[#CharStrings] = nil
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end
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-- top.CharStrings = named_charstrings
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if not top.ROS then
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if encoding == true then -- Use the built-in encoding
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CharStrings = parse_encoding(buf, i0, top.Encoding, CharStrings)
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elseif encoding then
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encoding = require'luametalatex-font-enc'(encoding)
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local encoded = {}
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for i, n in pairs(encoding) do
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encoded[i] = CharStrings[n]
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end
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CharStrings = encoded
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end -- else: Use GIDs
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top.Privates = {parse_dict(buf, i0+top.Private[2], i0+top.Private[2]+top.Private[1]-1, strings)}
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local subrs = top.Privates[1].Subrs
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if subrs then
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subrs = parse_index(buf, i0+top.Private[2]+subrs)
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local subrsdict ={}
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for j=1,#subrs-1 do
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subrsdict[j] = buf:sub(subrs[j], subrs[j+1]-1)
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end
|
|
subrsdict.used = {}
|
|
subrsdict.bias = #subrsdict < 1240 and 108 or #subrsdict < 33900 and 1132 or 32769
|
|
top.Privates[1].Subrs = subrsdict
|
|
end
|
|
top.Private = nil
|
|
else
|
|
assert(not encoding) -- FIXME: If we actually get these from OpenType, the glyph names might be hidden there...
|
|
-- Would that even be allowed?
|
|
local fonts = parse_index(buf, i0+top.FDArray)
|
|
local privates = {}
|
|
top.Privates = privates
|
|
for i=1,#fonts-1 do
|
|
local font = fonts[i]
|
|
local fontdir = parse_dict(buf, fonts[i], fonts[i+1]-1, strings)
|
|
privates[i] = parse_dict(buf, i0+fontdir.Private[2], i0+fontdir.Private[2]+fontdir.Private[1]-1, strings)
|
|
privates[i].FontName = fontdir.FontName
|
|
local subrs = privates[i].Subrs
|
|
if subrs then
|
|
subrs = parse_index(buf, i0+fontdir.Private[2]+subrs)
|
|
local subrsdict ={}
|
|
for j=1,#subrs-1 do
|
|
subrsdict[j] = buf:sub(subrs[j], subrs[j+1]-1)
|
|
end
|
|
subrsdict.used = {}
|
|
subrsdict.bias = #subrsdict < 1240 and 108 or #subrsdict < 33900 and 1132 or 32769
|
|
privates[i].Subrs = subrsdict
|
|
end
|
|
end
|
|
top.FDArray = nil
|
|
parse_fdselect(buf, i0+top.FDSelect, CharStrings)
|
|
end
|
|
local glyphs = {}
|
|
-- if false and usedcids then -- Subsetting FIXME: Disabled, because other tables have to be fixed up first
|
|
if usedcids then -- Subsetting FIXME: Should be Disabled, because other tables have to be fixed up first -- Actually seems to work now, let's test it a bit more
|
|
local usedfonts = {}
|
|
for i=1,#usedcids do
|
|
local cid = usedcids[i][1]
|
|
local cs = CharStrings[cid]
|
|
glyphs[i] = {cs = buf:sub(cs[1], cs[2]), index = cid, cidfont = cs[3], usedcid = usedcids[i]}
|
|
usedfonts[CharStrings[cid][3] or 1] = true
|
|
end
|
|
local lastfont = 0
|
|
for i=1,#top.Privates do
|
|
if usedfonts[i] then
|
|
lastfont = lastfont + 1
|
|
usedfonts[i] = lastfont
|
|
top.Privates[lastfont] = top.Privates[i]
|
|
end
|
|
end
|
|
for i=lastfont+1,#top.Privates do
|
|
top.Privates[i] = nil
|
|
end
|
|
for i=1,#glyphs do
|
|
glyphs[i].cidfont = usedfonts[glyphs[i].cidfont]
|
|
end
|
|
-- TODO: CIDFont / Privates subsetting... DONE(?)
|
|
-- TODO: Subrs subsetting... Instead of deleting unused SubRs, we only make them empty.
|
|
-- This avoids problems with renumberings whiuch would have to be consitant across
|
|
-- Fonts in some odd way, because they might be used by globalsubrs.
|
|
for i=1,#glyphs do
|
|
local g = glyphs[i]
|
|
local private = top.Privates[g.cidfont or 1]
|
|
local parsed = parse_charstring(g.cs, top.GlobalSubrs, private.Subrs) -- TODO: Implement
|
|
local width = parsed[1][2]
|
|
if width then
|
|
width = width + (private.nominalWidthX or 0)
|
|
else
|
|
width = private.defaultWidthX or 0
|
|
end
|
|
local m = top.FontMatrix or {.001, 0, 0, .001, 0, 0}
|
|
width = width * m[1] + m[3] -- I really have no idea why m[3] /= 0 might happen, but why not?
|
|
width = math.floor(width*1000+.5) -- Thats rescale into "PDF glyph space"
|
|
if g.usedcid[2] ~= width then print("MISMATCH:", g.usedcid[1], g.usedcid[2], width) end
|
|
g.usedcid[2] = width
|
|
end
|
|
for i=1,#top.GlobalSubrs do
|
|
if not top.GlobalSubrs.used[i] then
|
|
top.GlobalSubrs[i] = ""
|
|
end
|
|
end
|
|
for _, priv in ipairs(top.Privates) do if priv.Subrs then
|
|
for i=1,#priv.Subrs do
|
|
if not priv.Subrs.used[i] then
|
|
priv.Subrs[i] = ""
|
|
end
|
|
end
|
|
end end
|
|
else
|
|
for i, cs in pairs(CharStrings) do -- Not subsetting
|
|
glyphs[#glyphs+1] = {cs = buf:sub(cs[1], cs[2]), index = i, cidfont = cs.font}
|
|
end
|
|
end
|
|
top.glyphs = glyphs
|
|
table.sort(glyphs, function(a,b)return a.index<b.index end)
|
|
local bbox
|
|
if top.FontMatrix then
|
|
local x0, y0 = apply_matrix(top.FontMatrix, top.FontBBox[1], top.FontBBox[2])
|
|
local x1, y1 = apply_matrix(top.FontMatrix, top.FontBBox[3], top.FontBBox[4])
|
|
bbox = {x0, y0, x1, y1}
|
|
else
|
|
bbox = top.FontBBox
|
|
end
|
|
return require'luametalatex-font-cff'(top), bbox
|
|
end
|
|
|
|
return function(filename, fontid, encoding) return function(fontdir, usedcids)
|
|
local file <close> = readfile('opentype', filename)
|
|
local buf = file()
|
|
local i = 1
|
|
local magic = buf:sub(1, 4)
|
|
if magic == "ttcf" or magic == "OTTO" then
|
|
-- assert(not encoding) -- nil or false
|
|
encoding = encoding or false
|
|
local magic, tables = sfnt.parse(buf, fontid) -- TODO: Interpret widths etc, they might differ from the CFF ones.
|
|
assert(magic == "OTTO")
|
|
-- Also CFF2 would be nice to have
|
|
i = tables['CFF '][1]
|
|
end
|
|
local content, bbox = myfunc(buf, i, fontid, usedcids, encoding)
|
|
fontdir.bbox = bbox
|
|
return content
|
|
end end
|