summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luaotfload/fontloader-l-io.lua
blob: 6bf7a97bda27004defb65a26f0c10e7449193800 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
if not modules then modules = { } end modules ['l-io'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local io = io
local open, flush, write, read = io.open, io.flush, io.write, io.read
local byte, find, gsub, format = string.byte, string.find, string.gsub, string.format
local concat = table.concat
----- floor = math.floor
local type = type

if string.find(os.getenv("PATH") or "",";",1,true) then
    io.fileseparator, io.pathseparator = "\\", ";"
else
    io.fileseparator, io.pathseparator = "/" , ":"
end

-- local function readall(f)
--     return f:read("*all")
-- end

-- The next one is upto 50% faster on large files and less memory consumption due
-- to less intermediate large allocations. This phenomena was discussed on the
-- luatex dev list.

local large  = 0x01000000 -- 2^24 16.777.216
local medium = 0x00100000 -- 2^20  1.048.576
local small  = 0x00020000 -- 2^17    131.072

-- local function readall(f)
--     local size = f:seek("end")
--     if size == 0 then
--         return ""
--     end
--     f:seek("set",0)
--     if size < medium then
--         return f:read('*all')
--     else
--         local step = (size > large) and large or (floor(size/(medium)) * small)
--         local data = { }
--         while true do
--             local r = f:read(step)
--             if not r then
--                 return concat(data)
--             else
--                 data[#data+1] = r
--             end
--         end
--     end
-- end

local function readall(f)
 -- return f:read("*all")
    local size = f:seek("end")
    if size > 0 then
        f:seek("set",0)
        return f:read(size)
    else
        return ""
    end
end

io.readall = readall

function io.loaddata(filename,textmode) -- return nil if empty
    local f = open(filename,(textmode and 'r') or 'rb')
    if f then
        local size = f:seek("end")
        local data = nil
        if size > 0 then
         -- data = f:read("*all")
            f:seek("set",0)
            data = f:read(size)
        end
        f:close()
        return data
    end
end

-- function io.copydata(source,target,action)
--     local f = open(source,"rb")
--     if f then
--         local g = open(target,"wb")
--         if g then
--             local size = f:seek("end")
--             if size == 0 then
--                 -- empty
--             else
--                 f:seek("set",0)
--                 if size < medium then
--                     local data = f:read('*all')
--                     if action then
--                         data = action(data)
--                     end
--                     if data then
--                         g:write(data)
--                     end
--                 else
--                     local step = (size > large) and large or (floor(size/(medium)) * small)
--                     while true do
--                         local data = f:read(step)
--                         if data then
--                             if action then
--                                 data = action(data)
--                             end
--                             if data then
--                                 g:write(data)
--                             end
--                         else
--                             break
--                         end
--                     end
--                 end
--             end
--             g:close()
--         end
--         f:close()
--         flush()
--     end
-- end

function io.copydata(source,target,action)
    local f = open(source,"rb")
    if f then
        local g = open(target,"wb")
        if g then
            local size = f:seek("end")
            if size > 0 then
             -- local data = f:read('*all')
                f:seek("set",0)
                local data = f:read(size)
                if action then
                    data = action(data)
                end
                if data then
                    g:write(data)
                end
            end
            g:close()
        end
        f:close()
        flush()
    end
end

function io.savedata(filename,data,joiner,append)
    local f = open(filename,append and "ab" or "wb")
    if f then
        if append and joiner and f:seek("end") > 0 then
            f:write(joiner)
        end
        if type(data) == "table" then
            f:write(concat(data,joiner or ""))
        elseif type(data) == "function" then
            data(f)
        else
            f:write(data or "")
        end
        f:close()
        flush()
        return true
    else
        return false
    end
end

-- we can also chunk this one if needed: io.lines(filename,chunksize,"*l")

-- ffi.readline

if fio and fio.readline then

    local readline = fio.readline

    function io.loadlines(filename,n) -- return nil if empty
        local f = open(filename,'r')
        if not f then
            -- no file
        elseif n then
            local lines = { }
            for i=1,n do
                local line = readline(f)
                if line then
                    lines[i] = line
                else
                    break
                end
            end
            f:close()
            lines = concat(lines,"\n")
            if #lines > 0 then
                return lines
            end
        else
            local line = readline(f)
            f:close()
            if line and #line > 0 then
                return line
            end
        end
    end

else

    function io.loadlines(filename,n) -- return nil if empty
        local f = open(filename,'r')
        if not f then
            -- no file
        elseif n then
            local lines = { }
            for i=1,n do
                local line = f:read("*lines")
                if line then
                    lines[i] = line
                else
                    break
                end
            end
            f:close()
            lines = concat(lines,"\n")
            if #lines > 0 then
                return lines
            end
        else
            local line = f:read("*line") or ""
            f:close()
            if #line > 0 then
                return line
            end
        end
    end

end

function io.loadchunk(filename,n)
    local f = open(filename,'rb')
    if f then
        local data = f:read(n or 1024)
        f:close()
        if #data > 0 then
            return data
        end
    end
end

function io.exists(filename)
    local f = open(filename)
    if f == nil then
        return false
    else
        f:close()
        return true
    end
end

function io.size(filename)
    local f = open(filename)
    if f == nil then
        return 0
    else
        local s = f:seek("end")
        f:close()
        return s
    end
end

local function noflines(f)
    if type(f) == "string" then
        local f = open(filename)
        if f then
            local n = f and noflines(f) or 0
            f:close()
            return n
        else
            return 0
        end
    else
        -- todo: load and lpeg
        local n = 0
        for _ in f:lines() do
            n = n + 1
        end
        f:seek('set',0)
        return n
    end
end

io.noflines = noflines

-- inlined is faster ... beware, better use util-fil so these are obsolete
-- and will go

local nextchar = {
    [ 4] = function(f)
        return f:read(1,1,1,1)
    end,
    [ 2] = function(f)
        return f:read(1,1)
    end,
    [ 1] = function(f)
        return f:read(1)
    end,
    [-2] = function(f)
        local a, b = f:read(1,1)
        return b, a
    end,
    [-4] = function(f)
        local a, b, c, d = f:read(1,1,1,1)
        return d, c, b, a
    end
}

function io.characters(f,n)
    if f then
        return nextchar[n or 1], f
    end
end

local nextbyte = {
    [4] = function(f)
        local a, b, c, d = f:read(1,1,1,1)
        if d then
            return byte(a), byte(b), byte(c), byte(d)
        end
    end,
    [3] = function(f)
        local a, b, c = f:read(1,1,1)
        if b then
            return byte(a), byte(b), byte(c)
        end
    end,
    [2] = function(f)
        local a, b = f:read(1,1)
        if b then
            return byte(a), byte(b)
        end
    end,
    [1] = function (f)
        local a = f:read(1)
        if a then
            return byte(a)
        end
    end,
    [-2] = function (f)
        local a, b = f:read(1,1)
        if b then
            return byte(b), byte(a)
        end
    end,
    [-3] = function(f)
        local a, b, c = f:read(1,1,1)
        if b then
            return byte(c), byte(b), byte(a)
        end
    end,
    [-4] = function(f)
        local a, b, c, d = f:read(1,1,1,1)
        if d then
            return byte(d), byte(c), byte(b), byte(a)
        end
    end
}

function io.bytes(f,n)
    if f then
        return nextbyte[n or 1], f
    else
        return nil, nil
    end
end

function io.ask(question,default,options)
    while true do
        write(question)
        if options then
            write(format(" [%s]",concat(options,"|")))
        end
        if default then
            write(format(" [%s]",default))
        end
        write(format(" "))
        flush()
        local answer = read()
        answer = gsub(answer,"^%s*(.*)%s*$","%1")
        if answer == "" and default then
            return default
        elseif not options then
            return answer
        else
            for k=1,#options do
                if options[k] == answer then
                    return answer
                end
            end
            local pattern = "^" .. answer
            for k=1,#options do
                local v = options[k]
                if find(v,pattern) then
                    return v
                end
            end
        end
    end
end

local function readnumber(f,n,m) -- to be replaced
    if m then
        f:seek("set",n)
        n = m
    end
    if n == 1 then
        return byte(f:read(1))
    elseif n == 2 then
        local a, b = byte(f:read(2),1,2)
        return 0x100 * a + b
    elseif n == 3 then
        local a, b, c = byte(f:read(3),1,3)
        return 0x10000 * a + 0x100 * b + c
    elseif n == 4 then
        local a, b, c, d = byte(f:read(4),1,4)
        return 0x1000000 * a + 0x10000 * b + 0x100 * c + d
    elseif n == 8 then
        local a, b = readnumber(f,4), readnumber(f,4)
        return 0x100 * a + b
    elseif n == 12 then
        local a, b, c = readnumber(f,4), readnumber(f,4), readnumber(f,4)
        return 0x10000 * a + 0x100 * b + c
    elseif n == -2 then
        local b, a = byte(f:read(2),1,2)
        return 0x100 * a + b
    elseif n == -3 then
        local c, b, a = byte(f:read(3),1,3)
        return 0x10000 * a + 0x100 * b + c
    elseif n == -4 then
        local d, c, b, a = byte(f:read(4),1,4)
        return 0x1000000 * a + 0x10000 * b + 0x100*c + d
    elseif n == -8 then
        local h, g, f, e, d, c, b, a = byte(f:read(8),1,8)
        return 0x100000000000000 * a + 0x1000000000000 * b + 0x10000000000 * c + 0x100000000 * d +
                       0x1000000 * e +         0x10000 * f +         0x100 * g +               h
    else
        return 0
    end
end

io.readnumber = readnumber

function io.readstring(f,n,m)
    if m then
        f:seek("set",n)
        n = m
    end
    local str = gsub(f:read(n),"\000","")
    return str
end

-- This works quite ok:
--
-- function io.piped(command,writer)
--     local pipe = io.popen(command)
--  -- for line in pipe:lines() do
--  --     print(line)
--  -- end
--     while true do
--         local line = pipe:read(1)
--         if not line then
--             break
--         elseif line ~= "\n" then
--             writer(line)
--         end
--     end
--     return pipe:close() -- ok, status, (error)code
-- end