1 /*
2 * Copyright (c) Ian F. Darwin 1986-1995.
3 * Software written by Ian F. Darwin and others;
4 * maintained 1995-present by Christos Zoulas and others.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 /*
29 * Encoding -- determine the character encoding of a text file.
30 *
31 * Joerg Wunsch <joerg@freebsd.org> wrote the original support for 8-bit
32 * international characters.
33 */
34
35 #include "file.h"
36
37 #ifndef lint
38 FILE_RCSID("@(#)$File: encoding.c,v 1.21 2019/06/08 20:49:14 christos Exp $")
39 #endif /* lint */
40
41 #include "magic.h"
42 #include <string.h>
43 #include <stdlib.h>
44
45
46 private int looks_ascii(const unsigned char *, size_t, unicodechar *, size_t *);
47 private int looks_utf8_with_BOM(const unsigned char *, size_t, unicodechar *,
48 size_t *);
49 private int looks_utf7(const unsigned char *, size_t, unicodechar *, size_t *);
50 private int looks_ucs16(const unsigned char *, size_t, unicodechar *, size_t *);
51 private int looks_ucs32(const unsigned char *, size_t, unicodechar *, size_t *);
52 private int looks_latin1(const unsigned char *, size_t, unicodechar *, size_t *);
53 private int looks_extended(const unsigned char *, size_t, unicodechar *, size_t *);
54 private void from_ebcdic(const unsigned char *, size_t, unsigned char *);
55
56 #ifdef DEBUG_ENCODING
57 #define DPRINTF(a) printf a
58 #else
59 #define DPRINTF(a)
60 #endif
61
62 /*
63 * Try to determine whether text is in some character code we can
64 * identify. Each of these tests, if it succeeds, will leave
65 * the text converted into one-unicodechar-per-character Unicode in
66 * ubuf, and the number of characters converted in ulen.
67 */
68 protected int
file_encoding(struct magic_set * ms,const struct buffer * b,unicodechar ** ubuf,size_t * ulen,const char ** code,const char ** code_mime,const char ** type)69 file_encoding(struct magic_set *ms, const struct buffer *b, unicodechar **ubuf,
70 size_t *ulen, const char **code, const char **code_mime, const char **type)
71 {
72 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
73 size_t nbytes = b->flen > 64*1024 ? 64*1024 : b->flen;
74 size_t mlen;
75 int rv = 1, ucs_type;
76 unsigned char *nbuf = NULL;
77 unicodechar *udefbuf;
78 size_t udeflen;
79
80 if (ubuf == NULL)
81 ubuf = &udefbuf;
82 if (ulen == NULL)
83 ulen = &udeflen;
84
85 *type = "text";
86 *ulen = 0;
87 *code = "unknown";
88 *code_mime = "binary";
89
90 mlen = (nbytes + 1) * sizeof((*ubuf)[0]);
91 if ((*ubuf = CAST(unicodechar *, ecalloc(CAST(size_t, 1), mlen))) == NULL) {
92 file_oomem(ms, mlen);
93 goto done;
94 }
95 mlen = (nbytes + 1) * sizeof(nbuf[0]);
96 if ((nbuf = CAST(unsigned char *,
97 ecalloc(CAST(size_t, 1), mlen))) == NULL) {
98 file_oomem(ms, mlen);
99 goto done;
100 }
101
102 if (looks_ascii(buf, nbytes, *ubuf, ulen)) {
103 if (looks_utf7(buf, nbytes, *ubuf, ulen) > 0) {
104 DPRINTF(("utf-7 %" SIZE_T_FORMAT "u\n", *ulen));
105 *code = "UTF-7 Unicode";
106 *code_mime = "utf-7";
107 } else {
108 DPRINTF(("ascii %" SIZE_T_FORMAT "u\n", *ulen));
109 *code = "ASCII";
110 *code_mime = "us-ascii";
111 }
112 } else if (looks_utf8_with_BOM(buf, nbytes, *ubuf, ulen) > 0) {
113 DPRINTF(("utf8/bom %" SIZE_T_FORMAT "u\n", *ulen));
114 *code = "UTF-8 Unicode (with BOM)";
115 *code_mime = "utf-8";
116 } else if (file_looks_utf8(buf, nbytes, *ubuf, ulen) > 1) {
117 DPRINTF(("utf8 %" SIZE_T_FORMAT "u\n", *ulen));
118 *code = "UTF-8 Unicode";
119 *code_mime = "utf-8";
120 } else if ((ucs_type = looks_ucs32(buf, nbytes, *ubuf, ulen)) != 0) {
121 if (ucs_type == 1) {
122 *code = "Little-endian UTF-32 Unicode";
123 *code_mime = "utf-32le";
124 } else {
125 *code = "Big-endian UTF-32 Unicode";
126 *code_mime = "utf-32be";
127 }
128 DPRINTF(("ucs32 %" SIZE_T_FORMAT "u\n", *ulen));
129 } else if ((ucs_type = looks_ucs16(buf, nbytes, *ubuf, ulen)) != 0) {
130 if (ucs_type == 1) {
131 *code = "Little-endian UTF-16 Unicode";
132 *code_mime = "utf-16le";
133 } else {
134 *code = "Big-endian UTF-16 Unicode";
135 *code_mime = "utf-16be";
136 }
137 DPRINTF(("ucs16 %" SIZE_T_FORMAT "u\n", *ulen));
138 } else if (looks_latin1(buf, nbytes, *ubuf, ulen)) {
139 DPRINTF(("latin1 %" SIZE_T_FORMAT "u\n", *ulen));
140 *code = "ISO-8859";
141 *code_mime = "iso-8859-1";
142 } else if (looks_extended(buf, nbytes, *ubuf, ulen)) {
143 DPRINTF(("extended %" SIZE_T_FORMAT "u\n", *ulen));
144 *code = "Non-ISO extended-ASCII";
145 *code_mime = "unknown-8bit";
146 } else {
147 from_ebcdic(buf, nbytes, nbuf);
148
149 if (looks_ascii(nbuf, nbytes, *ubuf, ulen)) {
150 DPRINTF(("ebcdic %" SIZE_T_FORMAT "u\n", *ulen));
151 *code = "EBCDIC";
152 *code_mime = "ebcdic";
153 } else if (looks_latin1(nbuf, nbytes, *ubuf, ulen)) {
154 DPRINTF(("ebcdic/international %" SIZE_T_FORMAT "u\n",
155 *ulen));
156 *code = "International EBCDIC";
157 *code_mime = "ebcdic";
158 } else { /* Doesn't look like text at all */
159 DPRINTF(("binary\n"));
160 rv = 0;
161 *type = "binary";
162 }
163 }
164
165 done:
166 efree(nbuf);
167 if (ubuf == &udefbuf)
168 efree(udefbuf);
169
170 return rv;
171 }
172
173 /*
174 * This table reflects a particular philosophy about what constitutes
175 * "text," and there is room for disagreement about it.
176 *
177 * Version 3.31 of the file command considered a file to be ASCII if
178 * each of its characters was approved by either the isascii() or
179 * isalpha() function. On most systems, this would mean that any
180 * file consisting only of characters in the range 0x00 ... 0x7F
181 * would be called ASCII text, but many systems might reasonably
182 * consider some characters outside this range to be alphabetic,
183 * so the file command would call such characters ASCII. It might
184 * have been more accurate to call this "considered textual on the
185 * local system" than "ASCII."
186 *
187 * It considered a file to be "International language text" if each
188 * of its characters was either an ASCII printing character (according
189 * to the real ASCII standard, not the above test), a character in
190 * the range 0x80 ... 0xFF, or one of the following control characters:
191 * backspace, tab, line feed, vertical tab, form feed, carriage return,
192 * escape. No attempt was made to determine the language in which files
193 * of this type were written.
194 *
195 *
196 * The table below considers a file to be ASCII if all of its characters
197 * are either ASCII printing characters (again, according to the X3.4
198 * standard, not isascii()) or any of the following controls: bell,
199 * backspace, tab, line feed, form feed, carriage return, esc, nextline.
200 *
201 * I include bell because some programs (particularly shell scripts)
202 * use it literally, even though it is rare in normal text. I exclude
203 * vertical tab because it never seems to be used in real text. I also
204 * include, with hesitation, the X3.64/ECMA-43 control nextline (0x85),
205 * because that's what the dd EBCDIC->ASCII table maps the EBCDIC newline
206 * character to. It might be more appropriate to include it in the 8859
207 * set instead of the ASCII set, but it's got to be included in *something*
208 * we recognize or EBCDIC files aren't going to be considered textual.
209 * Some old Unix source files use SO/SI (^N/^O) to shift between Greek
210 * and Latin characters, so these should possibly be allowed. But they
211 * make a real mess on VT100-style displays if they're not paired properly,
212 * so we are probably better off not calling them text.
213 *
214 * A file is considered to be ISO-8859 text if its characters are all
215 * either ASCII, according to the above definition, or printing characters
216 * from the ISO-8859 8-bit extension, characters 0xA0 ... 0xFF.
217 *
218 * Finally, a file is considered to be international text from some other
219 * character code if its characters are all either ISO-8859 (according to
220 * the above definition) or characters in the range 0x80 ... 0x9F, which
221 * ISO-8859 considers to be control characters but the IBM PC and Macintosh
222 * consider to be printing characters.
223 */
224
225 #define F 0 /* character never appears in text */
226 #define T 1 /* character appears in plain ASCII text */
227 #define I 2 /* character appears in ISO-8859 text */
228 #define X 3 /* character appears in non-ISO extended ASCII (Mac, IBM PC) */
229
230 private char text_chars[256] = {
231 /* BEL BS HT LF VT FF CR */
232 F, F, F, F, F, F, F, T, T, T, T, T, T, T, F, F, /* 0x0X */
233 /* ESC */
234 F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */
235 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x2X */
236 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x3X */
237 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x4X */
238 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x5X */
239 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x6X */
240 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, /* 0x7X */
241 /* NEL */
242 X, X, X, X, X, T, X, X, X, X, X, X, X, X, X, X, /* 0x8X */
243 X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, /* 0x9X */
244 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xaX */
245 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xbX */
246 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xcX */
247 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xdX */
248 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xeX */
249 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I /* 0xfX */
250 };
251
252 private int
looks_ascii(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)253 looks_ascii(const unsigned char *buf, size_t nbytes, unicodechar *ubuf,
254 size_t *ulen)
255 {
256 size_t i;
257
258 *ulen = 0;
259
260 for (i = 0; i < nbytes; i++) {
261 int t = text_chars[buf[i]];
262
263 if (t != T)
264 return 0;
265
266 ubuf[(*ulen)++] = buf[i];
267 }
268
269 return 1;
270 }
271
272 private int
looks_latin1(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)273 looks_latin1(const unsigned char *buf, size_t nbytes, unicodechar *ubuf, size_t *ulen)
274 {
275 size_t i;
276
277 *ulen = 0;
278
279 for (i = 0; i < nbytes; i++) {
280 int t = text_chars[buf[i]];
281
282 if (t != T && t != I)
283 return 0;
284
285 ubuf[(*ulen)++] = buf[i];
286 }
287
288 return 1;
289 }
290
291 private int
looks_extended(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)292 looks_extended(const unsigned char *buf, size_t nbytes, unicodechar *ubuf,
293 size_t *ulen)
294 {
295 size_t i;
296
297 *ulen = 0;
298
299 for (i = 0; i < nbytes; i++) {
300 int t = text_chars[buf[i]];
301
302 if (t != T && t != I && t != X)
303 return 0;
304
305 ubuf[(*ulen)++] = buf[i];
306 }
307
308 return 1;
309 }
310
311 /*
312 * Decide whether some text looks like UTF-8. Returns:
313 *
314 * -1: invalid UTF-8
315 * 0: uses odd control characters, so doesn't look like text
316 * 1: 7-bit text
317 * 2: definitely UTF-8 text (valid high-bit set bytes)
318 *
319 * If ubuf is non-NULL on entry, text is decoded into ubuf, *ulen;
320 * ubuf must be big enough!
321 */
322 protected int
file_looks_utf8(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)323 file_looks_utf8(const unsigned char *buf, size_t nbytes, unicodechar *ubuf, size_t *ulen)
324 {
325 size_t i;
326 int n;
327 unicodechar c;
328 int gotone = 0, ctrl = 0;
329
330 if (ubuf)
331 *ulen = 0;
332
333 for (i = 0; i < nbytes; i++) {
334 if ((buf[i] & 0x80) == 0) { /* 0xxxxxxx is plain ASCII */
335 /*
336 * Even if the whole file is valid UTF-8 sequences,
337 * still reject it if it uses weird control characters.
338 */
339
340 if (text_chars[buf[i]] != T)
341 ctrl = 1;
342
343 if (ubuf)
344 ubuf[(*ulen)++] = buf[i];
345 } else if ((buf[i] & 0x40) == 0) { /* 10xxxxxx never 1st byte */
346 return -1;
347 } else { /* 11xxxxxx begins UTF-8 */
348 int following;
349
350 if ((buf[i] & 0x20) == 0) { /* 110xxxxx */
351 c = buf[i] & 0x1f;
352 following = 1;
353 } else if ((buf[i] & 0x10) == 0) { /* 1110xxxx */
354 c = buf[i] & 0x0f;
355 following = 2;
356 } else if ((buf[i] & 0x08) == 0) { /* 11110xxx */
357 c = buf[i] & 0x07;
358 following = 3;
359 } else if ((buf[i] & 0x04) == 0) { /* 111110xx */
360 c = buf[i] & 0x03;
361 following = 4;
362 } else if ((buf[i] & 0x02) == 0) { /* 1111110x */
363 c = buf[i] & 0x01;
364 following = 5;
365 } else
366 return -1;
367
368 for (n = 0; n < following; n++) {
369 i++;
370 if (i >= nbytes)
371 goto done;
372
373 if ((buf[i] & 0x80) == 0 || (buf[i] & 0x40))
374 return -1;
375
376 c = (c << 6) + (buf[i] & 0x3f);
377 }
378
379 if (ubuf)
380 ubuf[(*ulen)++] = c;
381 gotone = 1;
382 }
383 }
384 done:
385 return ctrl ? 0 : (gotone ? 2 : 1);
386 }
387
388 /*
389 * Decide whether some text looks like UTF-8 with BOM. If there is no
390 * BOM, return -1; otherwise return the result of looks_utf8 on the
391 * rest of the text.
392 */
393 private int
looks_utf8_with_BOM(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)394 looks_utf8_with_BOM(const unsigned char *buf, size_t nbytes, unicodechar *ubuf,
395 size_t *ulen)
396 {
397 if (nbytes > 3 && buf[0] == 0xef && buf[1] == 0xbb && buf[2] == 0xbf)
398 return file_looks_utf8(buf + 3, nbytes - 3, ubuf, ulen);
399 else
400 return -1;
401 }
402
403 private int
looks_utf7(const unsigned char * buf,size_t nbytes,unicodechar * ubuf,size_t * ulen)404 looks_utf7(const unsigned char *buf, size_t nbytes, unicodechar *ubuf, size_t *ulen)
405 {
406 if (nbytes > 4 && buf[0] == '+' && buf[1] == '/' && buf[2] == 'v')
407 switch (buf[3]) {
408 case '8':
409 case '9':
410 case '+':
411 case '/':
412 if (ubuf)
413 *ulen = 0;
414 return 1;
415 default:
416 return -1;
417 }
418 else
419 return -1;
420 }
421
422 private int
looks_ucs16(const unsigned char * bf,size_t nbytes,unicodechar * ubf,size_t * ulen)423 looks_ucs16(const unsigned char *bf, size_t nbytes, unicodechar *ubf,
424 size_t *ulen)
425 {
426 int bigend;
427 size_t i;
428
429 if (nbytes < 2)
430 return 0;
431
432 if (bf[0] == 0xff && bf[1] == 0xfe)
433 bigend = 0;
434 else if (bf[0] == 0xfe && bf[1] == 0xff)
435 bigend = 1;
436 else
437 return 0;
438
439 *ulen = 0;
440
441 for (i = 2; i + 1 < nbytes; i += 2) {
442 /* XXX fix to properly handle chars > 65536 */
443
444 if (bigend)
445 ubf[(*ulen)++] = bf[i + 1]
446 | (CAST(unicodechar, bf[i]) << 8);
447 else
448 ubf[(*ulen)++] = bf[i]
449 | (CAST(unicodechar, bf[i + 1]) << 8);
450
451 if (ubf[*ulen - 1] == 0xfffe)
452 return 0;
453 if (ubf[*ulen - 1] < 128 &&
454 text_chars[CAST(size_t, ubf[*ulen - 1])] != T)
455 return 0;
456 }
457
458 return 1 + bigend;
459 }
460
461 private int
looks_ucs32(const unsigned char * bf,size_t nbytes,unicodechar * ubf,size_t * ulen)462 looks_ucs32(const unsigned char *bf, size_t nbytes, unicodechar *ubf,
463 size_t *ulen)
464 {
465 int bigend;
466 size_t i;
467
468 if (nbytes < 4)
469 return 0;
470
471 if (bf[0] == 0xff && bf[1] == 0xfe && bf[2] == 0 && bf[3] == 0)
472 bigend = 0;
473 else if (bf[0] == 0 && bf[1] == 0 && bf[2] == 0xfe && bf[3] == 0xff)
474 bigend = 1;
475 else
476 return 0;
477
478 *ulen = 0;
479
480 for (i = 4; i + 3 < nbytes; i += 4) {
481 /* XXX fix to properly handle chars > 65536 */
482
483 if (bigend)
484 ubf[(*ulen)++] = CAST(unicodechar, bf[i + 3])
485 | (CAST(unicodechar, bf[i + 2]) << 8)
486 | (CAST(unicodechar, bf[i + 1]) << 16)
487 | (CAST(unicodechar, bf[i]) << 24);
488 else
489 ubf[(*ulen)++] = CAST(unicodechar, bf[i + 0])
490 | (CAST(unicodechar, bf[i + 1]) << 8)
491 | (CAST(unicodechar, bf[i + 2]) << 16)
492 | (CAST(unicodechar, bf[i + 3]) << 24);
493
494 if (ubf[*ulen - 1] == 0xfffe)
495 return 0;
496 if (ubf[*ulen - 1] < 128 &&
497 text_chars[CAST(size_t, ubf[*ulen - 1])] != T)
498 return 0;
499 }
500
501 return 1 + bigend;
502 }
503 #undef F
504 #undef T
505 #undef I
506 #undef X
507
508 /*
509 * This table maps each EBCDIC character to an (8-bit extended) ASCII
510 * character, as specified in the rationale for the dd(1) command in
511 * draft 11.2 (September, 1991) of the POSIX P1003.2 standard.
512 *
513 * Unfortunately it does not seem to correspond exactly to any of the
514 * five variants of EBCDIC documented in IBM's _Enterprise Systems
515 * Architecture/390: Principles of Operation_, SA22-7201-06, Seventh
516 * Edition, July, 1999, pp. I-1 - I-4.
517 *
518 * Fortunately, though, all versions of EBCDIC, including this one, agree
519 * on most of the printing characters that also appear in (7-bit) ASCII.
520 * Of these, only '|', '!', '~', '^', '[', and ']' are in question at all.
521 *
522 * Fortunately too, there is general agreement that codes 0x00 through
523 * 0x3F represent control characters, 0x41 a nonbreaking space, and the
524 * remainder printing characters.
525 *
526 * This is sufficient to allow us to identify EBCDIC text and to distinguish
527 * between old-style and internationalized examples of text.
528 */
529
530 private unsigned char ebcdic_to_ascii[] = {
531 0, 1, 2, 3, 156, 9, 134, 127, 151, 141, 142, 11, 12, 13, 14, 15,
532 16, 17, 18, 19, 157, 133, 8, 135, 24, 25, 146, 143, 28, 29, 30, 31,
533 128, 129, 130, 131, 132, 10, 23, 27, 136, 137, 138, 139, 140, 5, 6, 7,
534 144, 145, 22, 147, 148, 149, 150, 4, 152, 153, 154, 155, 20, 21, 158, 26,
535 ' ', 160, 161, 162, 163, 164, 165, 166, 167, 168, 213, '.', '<', '(', '+', '|',
536 '&', 169, 170, 171, 172, 173, 174, 175, 176, 177, '!', '$', '*', ')', ';', '~',
537 '-', '/', 178, 179, 180, 181, 182, 183, 184, 185, 203, ',', '%', '_', '>', '?',
538 186, 187, 188, 189, 190, 191, 192, 193, 194, '`', ':', '#', '@', '\'','=', '"',
539 195, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 196, 197, 198, 199, 200, 201,
540 202, 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', '^', 204, 205, 206, 207, 208,
541 209, 229, 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 210, 211, 212, '[', 214, 215,
542 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, ']', 230, 231,
543 '{', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 232, 233, 234, 235, 236, 237,
544 '}', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 238, 239, 240, 241, 242, 243,
545 '\\',159, 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 244, 245, 246, 247, 248, 249,
546 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 250, 251, 252, 253, 254, 255
547 };
548
549 #ifdef notdef
550 /*
551 * The following EBCDIC-to-ASCII table may relate more closely to reality,
552 * or at least to modern reality. It comes from
553 *
554 * http://ftp.s390.ibm.com/products/oe/bpxqp9.html
555 *
556 * and maps the characters of EBCDIC code page 1047 (the code used for
557 * Unix-derived software on IBM's 390 systems) to the corresponding
558 * characters from ISO 8859-1.
559 *
560 * If this table is used instead of the above one, some of the special
561 * cases for the NEL character can be taken out of the code.
562 */
563
564 private unsigned char ebcdic_1047_to_8859[] = {
565 0x00,0x01,0x02,0x03,0x9C,0x09,0x86,0x7F,0x97,0x8D,0x8E,0x0B,0x0C,0x0D,0x0E,0x0F,
566 0x10,0x11,0x12,0x13,0x9D,0x0A,0x08,0x87,0x18,0x19,0x92,0x8F,0x1C,0x1D,0x1E,0x1F,
567 0x80,0x81,0x82,0x83,0x84,0x85,0x17,0x1B,0x88,0x89,0x8A,0x8B,0x8C,0x05,0x06,0x07,
568 0x90,0x91,0x16,0x93,0x94,0x95,0x96,0x04,0x98,0x99,0x9A,0x9B,0x14,0x15,0x9E,0x1A,
569 0x20,0xA0,0xE2,0xE4,0xE0,0xE1,0xE3,0xE5,0xE7,0xF1,0xA2,0x2E,0x3C,0x28,0x2B,0x7C,
570 0x26,0xE9,0xEA,0xEB,0xE8,0xED,0xEE,0xEF,0xEC,0xDF,0x21,0x24,0x2A,0x29,0x3B,0x5E,
571 0x2D,0x2F,0xC2,0xC4,0xC0,0xC1,0xC3,0xC5,0xC7,0xD1,0xA6,0x2C,0x25,0x5F,0x3E,0x3F,
572 0xF8,0xC9,0xCA,0xCB,0xC8,0xCD,0xCE,0xCF,0xCC,0x60,0x3A,0x23,0x40,0x27,0x3D,0x22,
573 0xD8,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0xAB,0xBB,0xF0,0xFD,0xFE,0xB1,
574 0xB0,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0xAA,0xBA,0xE6,0xB8,0xC6,0xA4,
575 0xB5,0x7E,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0xA1,0xBF,0xD0,0x5B,0xDE,0xAE,
576 0xAC,0xA3,0xA5,0xB7,0xA9,0xA7,0xB6,0xBC,0xBD,0xBE,0xDD,0xA8,0xAF,0x5D,0xB4,0xD7,
577 0x7B,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0xAD,0xF4,0xF6,0xF2,0xF3,0xF5,
578 0x7D,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0xB9,0xFB,0xFC,0xF9,0xFA,0xFF,
579 0x5C,0xF7,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB2,0xD4,0xD6,0xD2,0xD3,0xD5,
580 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0xB3,0xDB,0xDC,0xD9,0xDA,0x9F
581 };
582 #endif
583
584 /*
585 * Copy buf[0 ... nbytes-1] into out[], translating EBCDIC to ASCII.
586 */
587 private void
from_ebcdic(const unsigned char * buf,size_t nbytes,unsigned char * out)588 from_ebcdic(const unsigned char *buf, size_t nbytes, unsigned char *out)
589 {
590 size_t i;
591
592 for (i = 0; i < nbytes; i++) {
593 out[i] = ebcdic_to_ascii[buf[i]];
594 }
595 }
596
