summaryrefslogtreecommitdiff
path: root/Build/source/texk/lcdf-typetools/lcdf-typetools-src/libefont/t1rw.cc
blob: 35e9f57a72c6705ad9a932303b7596c59b2572a6 (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
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
// -*- related-file-name: "../include/efont/t1rw.hh" -*-

/* t1rw.{cc,hh} -- Type 1 font reading and writing
 *
 * Copyright (c) 1998-2019 Eddie Kohler
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version. This program is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <efont/t1rw.hh>
#include <efont/t1cs.hh>
#include <lcdf/straccum.hh>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
namespace Efont {

unsigned char Type1Reader::xvalue_store[257];
unsigned char *Type1Reader::xvalue = &Type1Reader::xvalue_store[1];

void
Type1Reader::static_initialize()
{
    if (xvalue['A'])
        return;
    // rely on static data being initialized to 0
    xvalue['0'] = 0;  xvalue['1'] = 1;  xvalue['2'] = 2;  xvalue['3'] = 3;
    xvalue['4'] = 4;  xvalue['5'] = 5;  xvalue['6'] = 6;  xvalue['7'] = 7;
    xvalue['8'] = 8;  xvalue['9'] = 9;
    xvalue['A'] = 10; xvalue['B'] = 11; xvalue['C'] = 12; xvalue['D'] = 13;
    xvalue['E'] = 14; xvalue['F'] = 15;
    xvalue['a'] = 10; xvalue['b'] = 11; xvalue['c'] = 12; xvalue['d'] = 13;
    xvalue['e'] = 14; xvalue['f'] = 15;
}


Type1Reader::Type1Reader()
    : _data(new unsigned char[DATA_SIZE]), _len(0), _pos(0),
      _ungot(-1), _eexec(false)
{
    static_initialize();
}

Type1Reader::~Type1Reader()
{
    delete[] _data;
}


void
Type1Reader::set_charstring_definer(PermString x)
{
    _charstring_definer = x;
}

void
Type1Reader::switch_eexec(bool on, unsigned char *data, int len)
{
    if (on) {
        if (_pos < len + 3) {
            unsigned char *new_data = new unsigned char[len + 3 + DATA_SIZE];
            assert(_len <= DATA_SIZE);
            memcpy(new_data + len + 3, _data + _pos, _len - _pos);
            _len = len + 3 + _len - _pos;
            _pos = len + 3;
            delete[] _data;
            _data = new_data;
        }
        int original_pos = _pos;
        // don't forget _ungot!!
        if (_ungot >= 0)
            _data[--_pos] = _ungot, _ungot = -1;
        if (_crlf == 0 || _crlf == 2)
            _data[--_pos] = '\n';
        if (_crlf == 1 || _crlf == 2)
            _data[--_pos] = '\r';
        memcpy(_data + _pos - len, data, len);
        _pos -= len;
        start_eexec(original_pos - _pos);
    }
    _eexec = on;
}


int
Type1Reader::more_data()
{
    _pos = 0;
    _len = more_data(_data, DATA_SIZE);
    if (_len < 0)
        return -1;
    else
        return _data[_pos++];
}


inline int
Type1Reader::get_base()
{
    if (_pos >= _len)
        return more_data();
    else
        return _data[_pos++];
}


inline int
Type1Reader::eexec(int c)
{
    unsigned char answer = (unsigned char)(c ^ (_r >> 8));
    _r = (((unsigned char)c + _r) * (uint32_t) t1C1 + t1C2) & 0xFFFF;
    return answer;
}


int
Type1Reader::ascii_eexec_get()
{
    int d1 = get_base();
    while (isspace(d1))
        d1 = get_base();

    int d2 = get_base();
    while (isspace(d2))
        d2 = get_base();
    if (d2 < 0)
        return -1;

    return eexec((xvalue[d1] << 4) | (xvalue[d2]));
}


inline int
Type1Reader::get()
{
    if (!_eexec)
        return get_base();

    else if (_binary_eexec) {
        int c = get_base();
        return c < 0 ? c : eexec(c);

    } else
        return ascii_eexec_get();
}


void
Type1Reader::start_eexec(int initial_ascii)
{
    /* God damn this _ungot thing!! It makes sense not to check it on every
       char fetch, since it can only be set at the end of next_line; therefore,
       only the first get() into a user-visible function might need to check
       _ungot. The problem is I forgot start_eexec() was such a function! */
    int c = _ungot < 0 ? get_base() : _ungot;
    initial_ascii--;
    _ungot = -1;

    /* Strictly speaking, I should look for whitespace even in binary sections
       of PFB fonts; but it turns out some PFBs would be unreadable with that
       pedantic rule. */
    while (isspace(c) && (initial_ascii >= 0 || !preserve_whitespace()))
        c = get_base(), initial_ascii--;

    /* Differentiate between ASCII eexec and binary eexec. */
    int rand_bytes[4];
    _binary_eexec = false;
    for (int i = 0; i < 4; i++) {
        if (i)
            c = get_base();
        rand_bytes[i] = c;
        if (!isxdigit(c))
            _binary_eexec = true;
    }

    _r = t1R_ee;
    if (_binary_eexec)
        for (int i = 0; i < 4; i++)
            eexec(rand_bytes[i]);
    else {
        for (int i = 0; i < 2; i++) {
            c = xvalue[rand_bytes[i*2]] * 16 + xvalue[rand_bytes[i*2+1]];
            eexec(c);
        }
        ascii_eexec_get();
        ascii_eexec_get();
    }
}


bool
Type1Reader::test_charstring(StringAccum &str)
{
    /* PERFORMANCE NOTE: This function is definitely a bottleneck. Making it
       more efficient cut time by about 40%. */

    if (!_charstring_definer)
        return false;
    if (_charstring_len >= 0)
        return str.length() <= _charstring_start + _charstring_len;

    str.append('\0');           // protect against running off end of string
    char *s = str.data();
    char *start;
    while (*s == ' ')
        s++;

    if (s[0] == '/')
        s++;
    else if (s[0] == 'd' && s[1] == 'u' && s[2] == 'p' && isspace((unsigned char) s[3])) {
        s += 4;
        // 17.Jan.2000 -- some fonts have extra space here.
        while (isspace((unsigned char) *s))
            s++;
    } else
        goto not_charstring;

    // Force one literal space rather than isspace().
    // Why? Consistency: we force 1 literal space around _charstring_definer.
    while (*s != ' ' && *s)
        s++;
    if (*s++ != ' ' || !isdigit((unsigned char) *s))
        goto not_charstring;
    start = s;
    s++;
    while (*s != ' ' && *s)
        s++;
    if (strncmp(s, _charstring_definer.c_str(), _charstring_definer.length()) != 0)
        goto not_charstring;

    _charstring_len = strtol(start, 0, 10);
    _charstring_start = (s - str.data()) + _charstring_definer.length();
    str.pop_back();
    return str.length() <= _charstring_start + _charstring_len;

  not_charstring:
    str.pop_back();
    return false;
}


/* PERFORMANCE NOTE: All kinds of speedup tricks tried with eexec -- buffering
   (doing eexec processing at more_data time), etc., and all this stuff -- and
   found to have essentially zero effect for PFB fonts. Now, it might be
   effective for PFAs; but who cares? I hate PFAs. */

bool
Type1Reader::next_line(StringAccum &s)
{
    if (_len < 0)
        return false;

    // Can't be a charstring if incoming accumulator has nonzero length.
    _charstring_start = 0;
    _charstring_len = (s.length() > 0 ? 0 : -1);

    int first_char = _ungot < 0 ? get() : _ungot;
    _ungot = -1;

    for (int c = first_char; c >= 0; c = get())
        switch (c) {

          case '\n':
            if (test_charstring(s))
                goto normal;
            else {
                _crlf = 0;
                goto done;
            }

          case '\r':
            // check for \r\n (counts as only one line ending)
            if (test_charstring(s))
                goto normal;
            c = get();
            if (c != '\n' || preserve_whitespace())
                _ungot = c, _crlf = 1;
            else
                _crlf = 2;
            goto done;

          normal:
          default:
            s.append((char)c);
            break;

        }

  done:
    return true;
}


int
Type1Reader::get_data(unsigned char *data, int len)
{
    if (_len < 0)
        return -1;
    if (len <= 0)
        return 0;

    int pos = 0;
    if (_ungot >= 0) {
        *data++ = _ungot;
        pos++;
        _ungot = -1;
    }

    for (; pos < len; pos++) {
        int c = get();
        if (c < 0)
            break;
        *data++ = c;
    }

    return pos;
}


/*****
 * Type1PFAReader
 **/

Type1PFAReader::Type1PFAReader(FILE *f)
    : _f(f)
{
}

int
Type1PFAReader::more_data(unsigned char *data, int len)
{
    size_t size = fread(data, 1, len, _f);
    return size ? (int)size : -1;
}


/*****
 * Type1PFBReader
 **/

Type1PFBReader::Type1PFBReader(FILE *f)
    : _f(f), _binary(false), _left(0)
{
}

int
Type1PFBReader::more_data(unsigned char *data, int len)
{
    while (_left == 0) {
        int c = getc(_f);
        if (c != 128)
            return -1;

        c = getc(_f);
        if (c == 3 || c < 1 || c > 3)
            return -1;
        _binary = (c == 2);

        _left = getc(_f);
        _left |= getc(_f) << 8;
        _left |= getc(_f) << 16;
        _left |= getc(_f) << 24;
    }

    if (_left < 0)
        return -1;

    if (len > _left)
        len = _left;
    _left -= len;

    return fread(data, 1, len, _f);
}

bool
Type1PFBReader::preserve_whitespace() const
{
    return _binary;
}


/*****
 * Type1SubsetReader
 **/

Type1SubsetReader::Type1SubsetReader(Type1Reader *r, int left)
    : _reader(r), _left(left)
{
}

int
Type1SubsetReader::more_data(unsigned char *data, int len)
{
    if (_left <= 0)
        return -1;
    if (len > _left)
        len = _left;
    int how_much = _reader->get_data(data, len);
    if (how_much > 0)
        _left -= how_much;
    return how_much;
}

bool
Type1SubsetReader::preserve_whitespace() const
{
    return _reader->preserve_whitespace();
}


/*****
 * Writer
 **/

Type1Writer::Type1Writer()
    : _buf(new unsigned char[BufSize]), _pos(0),
      _eexec(false), _eexec_start(-1), _eexec_end(-1), _lenIV(4)
{
}


Type1Writer::~Type1Writer()
{
    assert(!_pos);
    delete[] _buf;
}


inline unsigned char
Type1Writer::eexec(int p)
{
    unsigned char c = ((unsigned char)p ^ (_r >> 8)) & 0xFF;
    _r = ((c + _r) * (uint32_t) t1C1 + t1C2) & 0xFFFF;
    return c;
}


void
Type1Writer::flush()
{
    local_flush();
}


/* PERFORMANCE NOTE: Doing eexec processing during flush -- which streamlines
   code for the print() methods -- seems to save some time (4-5%). It also
   makes write performance more consistent. But I have mixed feelings. */

void
Type1Writer::local_flush()
{
    if (_eexec_start >= 0 && _eexec_end < 0)
        _eexec_end = _pos;
    for (int p = _eexec_start; p < _eexec_end; p++)
        _buf[p] = eexec(_buf[p]);
    print0(_buf, _pos);
    _pos = 0;
    _eexec_start = _eexec ? 0 : -1;
    _eexec_end = -1;
}


void
Type1Writer::print(const char *s, int n)
{
    while (n > 0) {
        if (_pos >= BufSize)
            local_flush();
        int copy = BufSize - _pos;
        if (copy > n) copy = n;
        memcpy(_buf + _pos, s, copy);
        _pos += copy;
        s += copy;
        n -= copy;
    }
}


Type1Writer &
Type1Writer::operator<<(int x)
{
    char str[128];
    sprintf(str, "%d", x);
    print(str, strlen(str));
    return *this;
}


Type1Writer &
Type1Writer::operator<<(double x)
{
    char str[256];
    sprintf(str, "%g", x);
    print(str, strlen(str));
    return *this;
}


void
Type1Writer::switch_eexec(bool on)
{
    _eexec = on;
    if (_eexec) {
        _eexec_start = _pos;
        _r = t1R_ee;
        print("SUCK", 4);
    } else
        _eexec_end = _pos;
}


/*****
 * Type1PFAWriter
 **/

Type1PFAWriter::Type1PFAWriter(FILE *f)
    : _f(f), _hex_line(0)
{
}

Type1PFAWriter::~Type1PFAWriter()
{
    flush();
}


void
Type1PFAWriter::switch_eexec(bool on)
{
    flush();
    _hex_line = 0;
    Type1Writer::switch_eexec(on);
}

void
Type1PFAWriter::print0(const unsigned char *c, int l)
{
    if (eexecing()) {
        const char *hex = "0123456789ABCDEF";
        for (; l; c++, l--) {
            putc(hex[*c / 16], _f);
            putc(hex[*c % 16], _f);
            if (++_hex_line == 39) {
                putc('\n', _f);
                _hex_line = 0;
            }
        }
    } else {
        ssize_t result = fwrite(c, 1, l, _f);
        (void) result;
    }
}


/*****
 * Type1PFBWriter
 **/

Type1PFBWriter::Type1PFBWriter(FILE *f)
    : _f(f), _binary(false)
{
}

Type1PFBWriter::~Type1PFBWriter()
{
    flush();
    fputc(128, _f);
    fputc(3, _f);
}

void
Type1PFBWriter::flush()
{
    Type1Writer::flush();
    if (_save.length()) {
        fputc(128, _f);
        fputc(_binary ? 2 : 1, _f);
        long l = _save.length();
        fputc(l & 0xFF, _f);
        fputc((l >> 8) & 0xFF, _f);
        fputc((l >> 16) & 0xFF, _f);
        fputc((l >> 24) & 0xFF, _f);
        ssize_t result = fwrite(_save.data(), 1, _save.length(), _f);
        (void) result;
        _save.clear();
    }
}

void
Type1PFBWriter::switch_eexec(bool on)
{
    flush();
    Type1Writer::switch_eexec(on);
    _binary = on;
}

void
Type1PFBWriter::print0(const unsigned char *c, int l)
{
    char *m = _save.extend(l);
    memcpy(m, c, l);
}

}