ascmagic.c revision 175296
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 * ASCII magic -- file types that we know based on keywords 30 * that can appear anywhere in the file. 31 * 32 * Extensively modified by Eric Fischer <enf@pobox.com> in July, 2000, 33 * to handle character codes other than ASCII on a unified basis. 34 * 35 * Joerg Wunsch <joerg@freebsd.org> wrote the original support for 8-bit 36 * international characters, now subsumed into this file. 37 */ 38 39#include "file.h" 40#include "magic.h" 41#include <stdio.h> 42#include <string.h> 43#include <memory.h> 44#include <ctype.h> 45#include <stdlib.h> 46#ifdef HAVE_UNISTD_H 47#include <unistd.h> 48#endif 49#include "names.h" 50 51#ifndef lint 52FILE_RCSID("@(#)$File: ascmagic.c,v 1.53 2007/10/29 00:54:08 christos Exp $") 53#endif /* lint */ 54 55typedef unsigned long unichar; 56 57#define MAXLINELEN 300 /* longest sane line length */ 58#define ISSPC(x) ((x) == ' ' || (x) == '\t' || (x) == '\r' || (x) == '\n' \ 59 || (x) == 0x85 || (x) == '\f') 60 61private int looks_ascii(const unsigned char *, size_t, unichar *, size_t *); 62private int looks_utf8(const unsigned char *, size_t, unichar *, size_t *); 63private int looks_unicode(const unsigned char *, size_t, unichar *, size_t *); 64private int looks_latin1(const unsigned char *, size_t, unichar *, size_t *); 65private int looks_extended(const unsigned char *, size_t, unichar *, size_t *); 66private void from_ebcdic(const unsigned char *, size_t, unsigned char *); 67private int ascmatch(const unsigned char *, const unichar *, size_t); 68 69 70protected int 71file_ascmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes) 72{ 73 size_t i; 74 unsigned char *nbuf = NULL; 75 unichar *ubuf = NULL; 76 size_t ulen; 77 struct names *p; 78 int rv = -1; 79 int mime = ms->flags & MAGIC_MIME; 80 81 const char *code = NULL; 82 const char *code_mime = NULL; 83 const char *type = NULL; 84 const char *subtype = NULL; 85 const char *subtype_mime = NULL; 86 87 int has_escapes = 0; 88 int has_backspace = 0; 89 int seen_cr = 0; 90 91 int n_crlf = 0; 92 int n_lf = 0; 93 int n_cr = 0; 94 int n_nel = 0; 95 96 size_t last_line_end = (size_t)-1; 97 int has_long_lines = 0; 98 99 /* 100 * Undo the NUL-termination kindly provided by process() 101 * but leave at least one byte to look at 102 */ 103 while (nbytes > 1 && buf[nbytes - 1] == '\0') 104 nbytes--; 105 106 if ((nbuf = calloc(1, (nbytes + 1) * sizeof(nbuf[0]))) == NULL) 107 goto done; 108 if ((ubuf = calloc(1, (nbytes + 1) * sizeof(ubuf[0]))) == NULL) 109 goto done; 110 111 /* 112 * Then try to determine whether it's any character code we can 113 * identify. Each of these tests, if it succeeds, will leave 114 * the text converted into one-unichar-per-character Unicode in 115 * ubuf, and the number of characters converted in ulen. 116 */ 117 if (looks_ascii(buf, nbytes, ubuf, &ulen)) { 118 code = "ASCII"; 119 code_mime = "us-ascii"; 120 type = "text"; 121 } else if (looks_utf8(buf, nbytes, ubuf, &ulen)) { 122 code = "UTF-8 Unicode"; 123 code_mime = "utf-8"; 124 type = "text"; 125 } else if ((i = looks_unicode(buf, nbytes, ubuf, &ulen)) != 0) { 126 if (i == 1) 127 code = "Little-endian UTF-16 Unicode"; 128 else 129 code = "Big-endian UTF-16 Unicode"; 130 131 type = "character data"; 132 code_mime = "utf-16"; /* is this defined? */ 133 } else if (looks_latin1(buf, nbytes, ubuf, &ulen)) { 134 code = "ISO-8859"; 135 type = "text"; 136 code_mime = "iso-8859-1"; 137 } else if (looks_extended(buf, nbytes, ubuf, &ulen)) { 138 code = "Non-ISO extended-ASCII"; 139 type = "text"; 140 code_mime = "unknown"; 141 } else { 142 from_ebcdic(buf, nbytes, nbuf); 143 144 if (looks_ascii(nbuf, nbytes, ubuf, &ulen)) { 145 code = "EBCDIC"; 146 type = "character data"; 147 code_mime = "ebcdic"; 148 } else if (looks_latin1(nbuf, nbytes, ubuf, &ulen)) { 149 code = "International EBCDIC"; 150 type = "character data"; 151 code_mime = "ebcdic"; 152 } else { 153 rv = 0; 154 goto done; /* doesn't look like text at all */ 155 } 156 } 157 158 if (nbytes <= 1) { 159 rv = 0; 160 goto done; 161 } 162 163 /* 164 * for troff, look for . + letter + letter or .\"; 165 * this must be done to disambiguate tar archives' ./file 166 * and other trash from real troff input. 167 * 168 * I believe Plan 9 troff allows non-ASCII characters in the names 169 * of macros, so this test might possibly fail on such a file. 170 */ 171 if ((ms->flags & MAGIC_NO_CHECK_TROFF) == 0 && *ubuf == '.') { 172 unichar *tp = ubuf + 1; 173 174 while (ISSPC(*tp)) 175 ++tp; /* skip leading whitespace */ 176 if ((tp[0] == '\\' && tp[1] == '\"') || 177 (isascii((unsigned char)tp[0]) && 178 isalnum((unsigned char)tp[0]) && 179 isascii((unsigned char)tp[1]) && 180 isalnum((unsigned char)tp[1]) && 181 ISSPC(tp[2]))) { 182 subtype_mime = "text/troff"; 183 subtype = "troff or preprocessor input"; 184 goto subtype_identified; 185 } 186 } 187 188 /* look for tokens from names.h - this is expensive! */ 189 190 if ((ms->flags & MAGIC_NO_CHECK_TOKENS) != 0) 191 goto subtype_identified; 192 193 i = 0; 194 while (i < ulen) { 195 size_t end; 196 197 /* 198 * skip past any leading space 199 */ 200 while (i < ulen && ISSPC(ubuf[i])) 201 i++; 202 if (i >= ulen) 203 break; 204 205 /* 206 * find the next whitespace 207 */ 208 for (end = i + 1; end < nbytes; end++) 209 if (ISSPC(ubuf[end])) 210 break; 211 212 /* 213 * compare the word thus isolated against the token list 214 */ 215 for (p = names; p < names + NNAMES; p++) { 216 if (ascmatch((const unsigned char *)p->name, ubuf + i, 217 end - i)) { 218 subtype = types[p->type].human; 219 subtype_mime = types[p->type].mime; 220 goto subtype_identified; 221 } 222 } 223 224 i = end; 225 } 226 227subtype_identified: 228 229 /* 230 * Now try to discover other details about the file. 231 */ 232 for (i = 0; i < ulen; i++) { 233 if (ubuf[i] == '\n') { 234 if (seen_cr) 235 n_crlf++; 236 else 237 n_lf++; 238 last_line_end = i; 239 } else if (seen_cr) 240 n_cr++; 241 242 seen_cr = (ubuf[i] == '\r'); 243 if (seen_cr) 244 last_line_end = i; 245 246 if (ubuf[i] == 0x85) { /* X3.64/ECMA-43 "next line" character */ 247 n_nel++; 248 last_line_end = i; 249 } 250 251 /* If this line is _longer_ than MAXLINELEN, remember it. */ 252 if (i > last_line_end + MAXLINELEN) 253 has_long_lines = 1; 254 255 if (ubuf[i] == '\033') 256 has_escapes = 1; 257 if (ubuf[i] == '\b') 258 has_backspace = 1; 259 } 260 261 /* Beware, if the data has been truncated, the final CR could have 262 been followed by a LF. If we have HOWMANY bytes, it indicates 263 that the data might have been truncated, probably even before 264 this function was called. */ 265 if (seen_cr && nbytes < HOWMANY) 266 n_cr++; 267 268 if (mime) { 269 if (mime & MAGIC_MIME_TYPE) { 270 if (subtype_mime) { 271 if (file_printf(ms, subtype_mime) == -1) 272 goto done; 273 } else { 274 if (file_printf(ms, "text/plain") == -1) 275 goto done; 276 } 277 } 278 279 if ((mime == 0 || mime == MAGIC_MIME) && code_mime) { 280 if ((mime & MAGIC_MIME_TYPE) && 281 file_printf(ms, " charset=") == -1) 282 goto done; 283 if (file_printf(ms, code_mime) == -1) 284 goto done; 285 } 286 287 if (mime == MAGIC_MIME_ENCODING) 288 file_printf(ms, "binary"); 289 } else { 290 if (file_printf(ms, code) == -1) 291 goto done; 292 293 if (subtype) { 294 if (file_printf(ms, " ") == -1) 295 goto done; 296 if (file_printf(ms, subtype) == -1) 297 goto done; 298 } 299 300 if (file_printf(ms, " ") == -1) 301 goto done; 302 if (file_printf(ms, type) == -1) 303 goto done; 304 305 if (has_long_lines) 306 if (file_printf(ms, ", with very long lines") == -1) 307 goto done; 308 309 /* 310 * Only report line terminators if we find one other than LF, 311 * or if we find none at all. 312 */ 313 if ((n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) || 314 (n_crlf != 0 || n_cr != 0 || n_nel != 0)) { 315 if (file_printf(ms, ", with") == -1) 316 goto done; 317 318 if (n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) { 319 if (file_printf(ms, " no") == -1) 320 goto done; 321 } else { 322 if (n_crlf) { 323 if (file_printf(ms, " CRLF") == -1) 324 goto done; 325 if (n_cr || n_lf || n_nel) 326 if (file_printf(ms, ",") == -1) 327 goto done; 328 } 329 if (n_cr) { 330 if (file_printf(ms, " CR") == -1) 331 goto done; 332 if (n_lf || n_nel) 333 if (file_printf(ms, ",") == -1) 334 goto done; 335 } 336 if (n_lf) { 337 if (file_printf(ms, " LF") == -1) 338 goto done; 339 if (n_nel) 340 if (file_printf(ms, ",") == -1) 341 goto done; 342 } 343 if (n_nel) 344 if (file_printf(ms, " NEL") == -1) 345 goto done; 346 } 347 348 if (file_printf(ms, " line terminators") == -1) 349 goto done; 350 } 351 352 if (has_escapes) 353 if (file_printf(ms, ", with escape sequences") == -1) 354 goto done; 355 if (has_backspace) 356 if (file_printf(ms, ", with overstriking") == -1) 357 goto done; 358 } 359 rv = 1; 360done: 361 if (nbuf) 362 free(nbuf); 363 if (ubuf) 364 free(ubuf); 365 366 return rv; 367} 368 369private int 370ascmatch(const unsigned char *s, const unichar *us, size_t ulen) 371{ 372 size_t i; 373 374 for (i = 0; i < ulen; i++) { 375 if (s[i] != us[i]) 376 return 0; 377 } 378 379 if (s[i]) 380 return 0; 381 else 382 return 1; 383} 384 385/* 386 * This table reflects a particular philosophy about what constitutes 387 * "text," and there is room for disagreement about it. 388 * 389 * Version 3.31 of the file command considered a file to be ASCII if 390 * each of its characters was approved by either the isascii() or 391 * isalpha() function. On most systems, this would mean that any 392 * file consisting only of characters in the range 0x00 ... 0x7F 393 * would be called ASCII text, but many systems might reasonably 394 * consider some characters outside this range to be alphabetic, 395 * so the file command would call such characters ASCII. It might 396 * have been more accurate to call this "considered textual on the 397 * local system" than "ASCII." 398 * 399 * It considered a file to be "International language text" if each 400 * of its characters was either an ASCII printing character (according 401 * to the real ASCII standard, not the above test), a character in 402 * the range 0x80 ... 0xFF, or one of the following control characters: 403 * backspace, tab, line feed, vertical tab, form feed, carriage return, 404 * escape. No attempt was made to determine the language in which files 405 * of this type were written. 406 * 407 * 408 * The table below considers a file to be ASCII if all of its characters 409 * are either ASCII printing characters (again, according to the X3.4 410 * standard, not isascii()) or any of the following controls: bell, 411 * backspace, tab, line feed, form feed, carriage return, esc, nextline. 412 * 413 * I include bell because some programs (particularly shell scripts) 414 * use it literally, even though it is rare in normal text. I exclude 415 * vertical tab because it never seems to be used in real text. I also 416 * include, with hesitation, the X3.64/ECMA-43 control nextline (0x85), 417 * because that's what the dd EBCDIC->ASCII table maps the EBCDIC newline 418 * character to. It might be more appropriate to include it in the 8859 419 * set instead of the ASCII set, but it's got to be included in *something* 420 * we recognize or EBCDIC files aren't going to be considered textual. 421 * Some old Unix source files use SO/SI (^N/^O) to shift between Greek 422 * and Latin characters, so these should possibly be allowed. But they 423 * make a real mess on VT100-style displays if they're not paired properly, 424 * so we are probably better off not calling them text. 425 * 426 * A file is considered to be ISO-8859 text if its characters are all 427 * either ASCII, according to the above definition, or printing characters 428 * from the ISO-8859 8-bit extension, characters 0xA0 ... 0xFF. 429 * 430 * Finally, a file is considered to be international text from some other 431 * character code if its characters are all either ISO-8859 (according to 432 * the above definition) or characters in the range 0x80 ... 0x9F, which 433 * ISO-8859 considers to be control characters but the IBM PC and Macintosh 434 * consider to be printing characters. 435 */ 436 437#define F 0 /* character never appears in text */ 438#define T 1 /* character appears in plain ASCII text */ 439#define I 2 /* character appears in ISO-8859 text */ 440#define X 3 /* character appears in non-ISO extended ASCII (Mac, IBM PC) */ 441 442private char text_chars[256] = { 443 /* BEL BS HT LF FF CR */ 444 F, F, F, F, F, F, F, T, T, T, T, F, T, T, F, F, /* 0x0X */ 445 /* ESC */ 446 F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */ 447 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x2X */ 448 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x3X */ 449 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x4X */ 450 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x5X */ 451 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x6X */ 452 T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, /* 0x7X */ 453 /* NEL */ 454 X, X, X, X, X, T, X, X, X, X, X, X, X, X, X, X, /* 0x8X */ 455 X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, /* 0x9X */ 456 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xaX */ 457 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xbX */ 458 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xcX */ 459 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xdX */ 460 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xeX */ 461 I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I /* 0xfX */ 462}; 463 464private int 465looks_ascii(const unsigned char *buf, size_t nbytes, unichar *ubuf, 466 size_t *ulen) 467{ 468 size_t i; 469 470 *ulen = 0; 471 472 for (i = 0; i < nbytes; i++) { 473 int t = text_chars[buf[i]]; 474 475 if (t != T) 476 return 0; 477 478 ubuf[(*ulen)++] = buf[i]; 479 } 480 481 return 1; 482} 483 484private int 485looks_latin1(const unsigned char *buf, size_t nbytes, unichar *ubuf, size_t *ulen) 486{ 487 size_t i; 488 489 *ulen = 0; 490 491 for (i = 0; i < nbytes; i++) { 492 int t = text_chars[buf[i]]; 493 494 if (t != T && t != I) 495 return 0; 496 497 ubuf[(*ulen)++] = buf[i]; 498 } 499 500 return 1; 501} 502 503private int 504looks_extended(const unsigned char *buf, size_t nbytes, unichar *ubuf, 505 size_t *ulen) 506{ 507 size_t i; 508 509 *ulen = 0; 510 511 for (i = 0; i < nbytes; i++) { 512 int t = text_chars[buf[i]]; 513 514 if (t != T && t != I && t != X) 515 return 0; 516 517 ubuf[(*ulen)++] = buf[i]; 518 } 519 520 return 1; 521} 522 523private int 524looks_utf8(const unsigned char *buf, size_t nbytes, unichar *ubuf, size_t *ulen) 525{ 526 size_t i; 527 int n; 528 unichar c; 529 int gotone = 0; 530 531 *ulen = 0; 532 533 for (i = 0; i < nbytes; i++) { 534 if ((buf[i] & 0x80) == 0) { /* 0xxxxxxx is plain ASCII */ 535 /* 536 * Even if the whole file is valid UTF-8 sequences, 537 * still reject it if it uses weird control characters. 538 */ 539 540 if (text_chars[buf[i]] != T) 541 return 0; 542 543 ubuf[(*ulen)++] = buf[i]; 544 } else if ((buf[i] & 0x40) == 0) { /* 10xxxxxx never 1st byte */ 545 return 0; 546 } else { /* 11xxxxxx begins UTF-8 */ 547 int following; 548 549 if ((buf[i] & 0x20) == 0) { /* 110xxxxx */ 550 c = buf[i] & 0x1f; 551 following = 1; 552 } else if ((buf[i] & 0x10) == 0) { /* 1110xxxx */ 553 c = buf[i] & 0x0f; 554 following = 2; 555 } else if ((buf[i] & 0x08) == 0) { /* 11110xxx */ 556 c = buf[i] & 0x07; 557 following = 3; 558 } else if ((buf[i] & 0x04) == 0) { /* 111110xx */ 559 c = buf[i] & 0x03; 560 following = 4; 561 } else if ((buf[i] & 0x02) == 0) { /* 1111110x */ 562 c = buf[i] & 0x01; 563 following = 5; 564 } else 565 return 0; 566 567 for (n = 0; n < following; n++) { 568 i++; 569 if (i >= nbytes) 570 goto done; 571 572 if ((buf[i] & 0x80) == 0 || (buf[i] & 0x40)) 573 return 0; 574 575 c = (c << 6) + (buf[i] & 0x3f); 576 } 577 578 ubuf[(*ulen)++] = c; 579 gotone = 1; 580 } 581 } 582done: 583 return gotone; /* don't claim it's UTF-8 if it's all 7-bit */ 584} 585 586private int 587looks_unicode(const unsigned char *buf, size_t nbytes, unichar *ubuf, 588 size_t *ulen) 589{ 590 int bigend; 591 size_t i; 592 593 if (nbytes < 2) 594 return 0; 595 596 if (buf[0] == 0xff && buf[1] == 0xfe) 597 bigend = 0; 598 else if (buf[0] == 0xfe && buf[1] == 0xff) 599 bigend = 1; 600 else 601 return 0; 602 603 *ulen = 0; 604 605 for (i = 2; i + 1 < nbytes; i += 2) { 606 /* XXX fix to properly handle chars > 65536 */ 607 608 if (bigend) 609 ubuf[(*ulen)++] = buf[i + 1] + 256 * buf[i]; 610 else 611 ubuf[(*ulen)++] = buf[i] + 256 * buf[i + 1]; 612 613 if (ubuf[*ulen - 1] == 0xfffe) 614 return 0; 615 if (ubuf[*ulen - 1] < 128 && 616 text_chars[(size_t)ubuf[*ulen - 1]] != T) 617 return 0; 618 } 619 620 return 1 + bigend; 621} 622 623#undef F 624#undef T 625#undef I 626#undef X 627 628/* 629 * This table maps each EBCDIC character to an (8-bit extended) ASCII 630 * character, as specified in the rationale for the dd(1) command in 631 * draft 11.2 (September, 1991) of the POSIX P1003.2 standard. 632 * 633 * Unfortunately it does not seem to correspond exactly to any of the 634 * five variants of EBCDIC documented in IBM's _Enterprise Systems 635 * Architecture/390: Principles of Operation_, SA22-7201-06, Seventh 636 * Edition, July, 1999, pp. I-1 - I-4. 637 * 638 * Fortunately, though, all versions of EBCDIC, including this one, agree 639 * on most of the printing characters that also appear in (7-bit) ASCII. 640 * Of these, only '|', '!', '~', '^', '[', and ']' are in question at all. 641 * 642 * Fortunately too, there is general agreement that codes 0x00 through 643 * 0x3F represent control characters, 0x41 a nonbreaking space, and the 644 * remainder printing characters. 645 * 646 * This is sufficient to allow us to identify EBCDIC text and to distinguish 647 * between old-style and internationalized examples of text. 648 */ 649 650private unsigned char ebcdic_to_ascii[] = { 651 0, 1, 2, 3, 156, 9, 134, 127, 151, 141, 142, 11, 12, 13, 14, 15, 652 16, 17, 18, 19, 157, 133, 8, 135, 24, 25, 146, 143, 28, 29, 30, 31, 653128, 129, 130, 131, 132, 10, 23, 27, 136, 137, 138, 139, 140, 5, 6, 7, 654144, 145, 22, 147, 148, 149, 150, 4, 152, 153, 154, 155, 20, 21, 158, 26, 655' ', 160, 161, 162, 163, 164, 165, 166, 167, 168, 213, '.', '<', '(', '+', '|', 656'&', 169, 170, 171, 172, 173, 174, 175, 176, 177, '!', '$', '*', ')', ';', '~', 657'-', '/', 178, 179, 180, 181, 182, 183, 184, 185, 203, ',', '%', '_', '>', '?', 658186, 187, 188, 189, 190, 191, 192, 193, 194, '`', ':', '#', '@', '\'','=', '"', 659195, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 196, 197, 198, 199, 200, 201, 660202, 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', '^', 204, 205, 206, 207, 208, 661209, 229, 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 210, 211, 212, '[', 214, 215, 662216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, ']', 230, 231, 663'{', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 232, 233, 234, 235, 236, 237, 664'}', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 238, 239, 240, 241, 242, 243, 665'\\',159, 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 244, 245, 246, 247, 248, 249, 666'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 250, 251, 252, 253, 254, 255 667}; 668 669#ifdef notdef 670/* 671 * The following EBCDIC-to-ASCII table may relate more closely to reality, 672 * or at least to modern reality. It comes from 673 * 674 * http://ftp.s390.ibm.com/products/oe/bpxqp9.html 675 * 676 * and maps the characters of EBCDIC code page 1047 (the code used for 677 * Unix-derived software on IBM's 390 systems) to the corresponding 678 * characters from ISO 8859-1. 679 * 680 * If this table is used instead of the above one, some of the special 681 * cases for the NEL character can be taken out of the code. 682 */ 683 684private unsigned char ebcdic_1047_to_8859[] = { 6850x00,0x01,0x02,0x03,0x9C,0x09,0x86,0x7F,0x97,0x8D,0x8E,0x0B,0x0C,0x0D,0x0E,0x0F, 6860x10,0x11,0x12,0x13,0x9D,0x0A,0x08,0x87,0x18,0x19,0x92,0x8F,0x1C,0x1D,0x1E,0x1F, 6870x80,0x81,0x82,0x83,0x84,0x85,0x17,0x1B,0x88,0x89,0x8A,0x8B,0x8C,0x05,0x06,0x07, 6880x90,0x91,0x16,0x93,0x94,0x95,0x96,0x04,0x98,0x99,0x9A,0x9B,0x14,0x15,0x9E,0x1A, 6890x20,0xA0,0xE2,0xE4,0xE0,0xE1,0xE3,0xE5,0xE7,0xF1,0xA2,0x2E,0x3C,0x28,0x2B,0x7C, 6900x26,0xE9,0xEA,0xEB,0xE8,0xED,0xEE,0xEF,0xEC,0xDF,0x21,0x24,0x2A,0x29,0x3B,0x5E, 6910x2D,0x2F,0xC2,0xC4,0xC0,0xC1,0xC3,0xC5,0xC7,0xD1,0xA6,0x2C,0x25,0x5F,0x3E,0x3F, 6920xF8,0xC9,0xCA,0xCB,0xC8,0xCD,0xCE,0xCF,0xCC,0x60,0x3A,0x23,0x40,0x27,0x3D,0x22, 6930xD8,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0xAB,0xBB,0xF0,0xFD,0xFE,0xB1, 6940xB0,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0xAA,0xBA,0xE6,0xB8,0xC6,0xA4, 6950xB5,0x7E,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0xA1,0xBF,0xD0,0x5B,0xDE,0xAE, 6960xAC,0xA3,0xA5,0xB7,0xA9,0xA7,0xB6,0xBC,0xBD,0xBE,0xDD,0xA8,0xAF,0x5D,0xB4,0xD7, 6970x7B,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0xAD,0xF4,0xF6,0xF2,0xF3,0xF5, 6980x7D,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0xB9,0xFB,0xFC,0xF9,0xFA,0xFF, 6990x5C,0xF7,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB2,0xD4,0xD6,0xD2,0xD3,0xD5, 7000x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0xB3,0xDB,0xDC,0xD9,0xDA,0x9F 701}; 702#endif 703 704/* 705 * Copy buf[0 ... nbytes-1] into out[], translating EBCDIC to ASCII. 706 */ 707private void 708from_ebcdic(const unsigned char *buf, size_t nbytes, unsigned char *out) 709{ 710 size_t i; 711 712 for (i = 0; i < nbytes; i++) { 713 out[i] = ebcdic_to_ascii[buf[i]]; 714 } 715} 716