encoding.c 17 KB

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  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. #include "file.h"
  35. #ifndef lint
  36. FILE_RCSID("@(#)$File: encoding.c,v 1.7 2012/01/24 19:02:02 christos Exp $")
  37. #endif /* lint */
  38. #include "magic.h"
  39. #include <string.h>
  40. #include <memory.h>
  41. #include <stdlib.h>
  42. private int looks_ascii(const unsigned char *, size_t, unichar *, size_t *);
  43. private int looks_utf8_with_BOM(const unsigned char *, size_t, unichar *,
  44. size_t *);
  45. private int looks_ucs16(const unsigned char *, size_t, unichar *, size_t *);
  46. private int looks_latin1(const unsigned char *, size_t, unichar *, size_t *);
  47. private int looks_extended(const unsigned char *, size_t, unichar *, size_t *);
  48. private void from_ebcdic(const unsigned char *, size_t, unsigned char *);
  49. #ifdef DEBUG_ENCODING
  50. #define DPRINTF(a) printf a
  51. #else
  52. #define DPRINTF(a)
  53. #endif
  54. /*
  55. * Try to determine whether text is in some character code we can
  56. * identify. Each of these tests, if it succeeds, will leave
  57. * the text converted into one-unichar-per-character Unicode in
  58. * ubuf, and the number of characters converted in ulen.
  59. */
  60. protected int
  61. file_encoding(struct magic_set *ms, const unsigned char *buf, size_t nbytes, unichar **ubuf, size_t *ulen, const char **code, const char **code_mime, const char **type)
  62. {
  63. size_t mlen;
  64. int rv = 1, ucs_type;
  65. unsigned char *nbuf = NULL;
  66. *type = "text";
  67. mlen = (nbytes + 1) * sizeof(nbuf[0]);
  68. if ((nbuf = CAST(unsigned char *, calloc((size_t)1, mlen))) == NULL) {
  69. file_oomem(ms, mlen);
  70. goto done;
  71. }
  72. mlen = (nbytes + 1) * sizeof((*ubuf)[0]);
  73. if ((*ubuf = CAST(unichar *, calloc((size_t)1, mlen))) == NULL) {
  74. file_oomem(ms, mlen);
  75. goto done;
  76. }
  77. if (looks_ascii(buf, nbytes, *ubuf, ulen)) {
  78. DPRINTF(("ascii %" SIZE_T_FORMAT "u\n", *ulen));
  79. *code = "ASCII";
  80. *code_mime = "us-ascii";
  81. } else if (looks_utf8_with_BOM(buf, nbytes, *ubuf, ulen) > 0) {
  82. DPRINTF(("utf8/bom %" SIZE_T_FORMAT "u\n", *ulen));
  83. *code = "UTF-8 Unicode (with BOM)";
  84. *code_mime = "utf-8";
  85. } else if (file_looks_utf8(buf, nbytes, *ubuf, ulen) > 1) {
  86. DPRINTF(("utf8 %" SIZE_T_FORMAT "u\n", *ulen));
  87. *code = "UTF-8 Unicode (with BOM)";
  88. *code = "UTF-8 Unicode";
  89. *code_mime = "utf-8";
  90. } else if ((ucs_type = looks_ucs16(buf, nbytes, *ubuf, ulen)) != 0) {
  91. if (ucs_type == 1) {
  92. *code = "Little-endian UTF-16 Unicode";
  93. *code_mime = "utf-16le";
  94. } else {
  95. *code = "Big-endian UTF-16 Unicode";
  96. *code_mime = "utf-16be";
  97. }
  98. DPRINTF(("ucs16 %" SIZE_T_FORMAT "u\n", *ulen));
  99. } else if (looks_latin1(buf, nbytes, *ubuf, ulen)) {
  100. DPRINTF(("latin1 %" SIZE_T_FORMAT "u\n", *ulen));
  101. *code = "ISO-8859";
  102. *code_mime = "iso-8859-1";
  103. } else if (looks_extended(buf, nbytes, *ubuf, ulen)) {
  104. DPRINTF(("extended %" SIZE_T_FORMAT "u\n", *ulen));
  105. *code = "Non-ISO extended-ASCII";
  106. *code_mime = "unknown-8bit";
  107. } else {
  108. from_ebcdic(buf, nbytes, nbuf);
  109. if (looks_ascii(nbuf, nbytes, *ubuf, ulen)) {
  110. DPRINTF(("ebcdic %" SIZE_T_FORMAT "u\n", *ulen));
  111. *code = "EBCDIC";
  112. *code_mime = "ebcdic";
  113. } else if (looks_latin1(nbuf, nbytes, *ubuf, ulen)) {
  114. DPRINTF(("ebcdic/international %" SIZE_T_FORMAT "u\n",
  115. *ulen));
  116. *code = "International EBCDIC";
  117. *code_mime = "ebcdic";
  118. } else { /* Doesn't look like text at all */
  119. DPRINTF(("binary\n"));
  120. rv = 0;
  121. *type = "binary";
  122. }
  123. }
  124. done:
  125. free(nbuf);
  126. return rv;
  127. }
  128. /*
  129. * This table reflects a particular philosophy about what constitutes
  130. * "text," and there is room for disagreement about it.
  131. *
  132. * Version 3.31 of the file command considered a file to be ASCII if
  133. * each of its characters was approved by either the isascii() or
  134. * isalpha() function. On most systems, this would mean that any
  135. * file consisting only of characters in the range 0x00 ... 0x7F
  136. * would be called ASCII text, but many systems might reasonably
  137. * consider some characters outside this range to be alphabetic,
  138. * so the file command would call such characters ASCII. It might
  139. * have been more accurate to call this "considered textual on the
  140. * local system" than "ASCII."
  141. *
  142. * It considered a file to be "International language text" if each
  143. * of its characters was either an ASCII printing character (according
  144. * to the real ASCII standard, not the above test), a character in
  145. * the range 0x80 ... 0xFF, or one of the following control characters:
  146. * backspace, tab, line feed, vertical tab, form feed, carriage return,
  147. * escape. No attempt was made to determine the language in which files
  148. * of this type were written.
  149. *
  150. *
  151. * The table below considers a file to be ASCII if all of its characters
  152. * are either ASCII printing characters (again, according to the X3.4
  153. * standard, not isascii()) or any of the following controls: bell,
  154. * backspace, tab, line feed, form feed, carriage return, esc, nextline.
  155. *
  156. * I include bell because some programs (particularly shell scripts)
  157. * use it literally, even though it is rare in normal text. I exclude
  158. * vertical tab because it never seems to be used in real text. I also
  159. * include, with hesitation, the X3.64/ECMA-43 control nextline (0x85),
  160. * because that's what the dd EBCDIC->ASCII table maps the EBCDIC newline
  161. * character to. It might be more appropriate to include it in the 8859
  162. * set instead of the ASCII set, but it's got to be included in *something*
  163. * we recognize or EBCDIC files aren't going to be considered textual.
  164. * Some old Unix source files use SO/SI (^N/^O) to shift between Greek
  165. * and Latin characters, so these should possibly be allowed. But they
  166. * make a real mess on VT100-style displays if they're not paired properly,
  167. * so we are probably better off not calling them text.
  168. *
  169. * A file is considered to be ISO-8859 text if its characters are all
  170. * either ASCII, according to the above definition, or printing characters
  171. * from the ISO-8859 8-bit extension, characters 0xA0 ... 0xFF.
  172. *
  173. * Finally, a file is considered to be international text from some other
  174. * character code if its characters are all either ISO-8859 (according to
  175. * the above definition) or characters in the range 0x80 ... 0x9F, which
  176. * ISO-8859 considers to be control characters but the IBM PC and Macintosh
  177. * consider to be printing characters.
  178. */
  179. #define F 0 /* character never appears in text */
  180. #define T 1 /* character appears in plain ASCII text */
  181. #define I 2 /* character appears in ISO-8859 text */
  182. #define X 3 /* character appears in non-ISO extended ASCII (Mac, IBM PC) */
  183. private char text_chars[256] = {
  184. /* BEL BS HT LF FF CR */
  185. F, F, F, F, F, F, F, T, T, T, T, F, T, T, F, F, /* 0x0X */
  186. /* ESC */
  187. F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */
  188. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x2X */
  189. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x3X */
  190. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x4X */
  191. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x5X */
  192. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x6X */
  193. T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, /* 0x7X */
  194. /* NEL */
  195. X, X, X, X, X, T, X, X, X, X, X, X, X, X, X, X, /* 0x8X */
  196. X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, /* 0x9X */
  197. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xaX */
  198. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xbX */
  199. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xcX */
  200. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xdX */
  201. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xeX */
  202. I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I /* 0xfX */
  203. };
  204. private int
  205. looks_ascii(const unsigned char *buf, size_t nbytes, unichar *ubuf,
  206. size_t *ulen)
  207. {
  208. size_t i;
  209. *ulen = 0;
  210. for (i = 0; i < nbytes; i++) {
  211. int t = text_chars[buf[i]];
  212. if (t != T)
  213. return 0;
  214. ubuf[(*ulen)++] = buf[i];
  215. }
  216. return 1;
  217. }
  218. private int
  219. looks_latin1(const unsigned char *buf, size_t nbytes, unichar *ubuf, size_t *ulen)
  220. {
  221. size_t i;
  222. *ulen = 0;
  223. for (i = 0; i < nbytes; i++) {
  224. int t = text_chars[buf[i]];
  225. if (t != T && t != I)
  226. return 0;
  227. ubuf[(*ulen)++] = buf[i];
  228. }
  229. return 1;
  230. }
  231. private int
  232. looks_extended(const unsigned char *buf, size_t nbytes, unichar *ubuf,
  233. size_t *ulen)
  234. {
  235. size_t i;
  236. *ulen = 0;
  237. for (i = 0; i < nbytes; i++) {
  238. int t = text_chars[buf[i]];
  239. if (t != T && t != I && t != X)
  240. return 0;
  241. ubuf[(*ulen)++] = buf[i];
  242. }
  243. return 1;
  244. }
  245. /*
  246. * Decide whether some text looks like UTF-8. Returns:
  247. *
  248. * -1: invalid UTF-8
  249. * 0: uses odd control characters, so doesn't look like text
  250. * 1: 7-bit text
  251. * 2: definitely UTF-8 text (valid high-bit set bytes)
  252. *
  253. * If ubuf is non-NULL on entry, text is decoded into ubuf, *ulen;
  254. * ubuf must be big enough!
  255. */
  256. protected int
  257. file_looks_utf8(const unsigned char *buf, size_t nbytes, unichar *ubuf, size_t *ulen)
  258. {
  259. size_t i;
  260. int n;
  261. unichar c;
  262. int gotone = 0, ctrl = 0;
  263. if (ubuf)
  264. *ulen = 0;
  265. for (i = 0; i < nbytes; i++) {
  266. if ((buf[i] & 0x80) == 0) { /* 0xxxxxxx is plain ASCII */
  267. /*
  268. * Even if the whole file is valid UTF-8 sequences,
  269. * still reject it if it uses weird control characters.
  270. */
  271. if (text_chars[buf[i]] != T)
  272. ctrl = 1;
  273. if (ubuf)
  274. ubuf[(*ulen)++] = buf[i];
  275. } else if ((buf[i] & 0x40) == 0) { /* 10xxxxxx never 1st byte */
  276. return -1;
  277. } else { /* 11xxxxxx begins UTF-8 */
  278. int following;
  279. if ((buf[i] & 0x20) == 0) { /* 110xxxxx */
  280. c = buf[i] & 0x1f;
  281. following = 1;
  282. } else if ((buf[i] & 0x10) == 0) { /* 1110xxxx */
  283. c = buf[i] & 0x0f;
  284. following = 2;
  285. } else if ((buf[i] & 0x08) == 0) { /* 11110xxx */
  286. c = buf[i] & 0x07;
  287. following = 3;
  288. } else if ((buf[i] & 0x04) == 0) { /* 111110xx */
  289. c = buf[i] & 0x03;
  290. following = 4;
  291. } else if ((buf[i] & 0x02) == 0) { /* 1111110x */
  292. c = buf[i] & 0x01;
  293. following = 5;
  294. } else
  295. return -1;
  296. for (n = 0; n < following; n++) {
  297. i++;
  298. if (i >= nbytes)
  299. goto done;
  300. if ((buf[i] & 0x80) == 0 || (buf[i] & 0x40))
  301. return -1;
  302. c = (c << 6) + (buf[i] & 0x3f);
  303. }
  304. if (ubuf)
  305. ubuf[(*ulen)++] = c;
  306. gotone = 1;
  307. }
  308. }
  309. done:
  310. return ctrl ? 0 : (gotone ? 2 : 1);
  311. }
  312. /*
  313. * Decide whether some text looks like UTF-8 with BOM. If there is no
  314. * BOM, return -1; otherwise return the result of looks_utf8 on the
  315. * rest of the text.
  316. */
  317. private int
  318. looks_utf8_with_BOM(const unsigned char *buf, size_t nbytes, unichar *ubuf,
  319. size_t *ulen)
  320. {
  321. if (nbytes > 3 && buf[0] == 0xef && buf[1] == 0xbb && buf[2] == 0xbf)
  322. return file_looks_utf8(buf + 3, nbytes - 3, ubuf, ulen);
  323. else
  324. return -1;
  325. }
  326. private int
  327. looks_ucs16(const unsigned char *buf, size_t nbytes, unichar *ubuf,
  328. size_t *ulen)
  329. {
  330. int bigend;
  331. size_t i;
  332. if (nbytes < 2)
  333. return 0;
  334. if (buf[0] == 0xff && buf[1] == 0xfe)
  335. bigend = 0;
  336. else if (buf[0] == 0xfe && buf[1] == 0xff)
  337. bigend = 1;
  338. else
  339. return 0;
  340. *ulen = 0;
  341. for (i = 2; i + 1 < nbytes; i += 2) {
  342. /* XXX fix to properly handle chars > 65536 */
  343. if (bigend)
  344. ubuf[(*ulen)++] = buf[i + 1] + 256 * buf[i];
  345. else
  346. ubuf[(*ulen)++] = buf[i] + 256 * buf[i + 1];
  347. if (ubuf[*ulen - 1] == 0xfffe)
  348. return 0;
  349. if (ubuf[*ulen - 1] < 128 &&
  350. text_chars[(size_t)ubuf[*ulen - 1]] != T)
  351. return 0;
  352. }
  353. return 1 + bigend;
  354. }
  355. #undef F
  356. #undef T
  357. #undef I
  358. #undef X
  359. /*
  360. * This table maps each EBCDIC character to an (8-bit extended) ASCII
  361. * character, as specified in the rationale for the dd(1) command in
  362. * draft 11.2 (September, 1991) of the POSIX P1003.2 standard.
  363. *
  364. * Unfortunately it does not seem to correspond exactly to any of the
  365. * five variants of EBCDIC documented in IBM's _Enterprise Systems
  366. * Architecture/390: Principles of Operation_, SA22-7201-06, Seventh
  367. * Edition, July, 1999, pp. I-1 - I-4.
  368. *
  369. * Fortunately, though, all versions of EBCDIC, including this one, agree
  370. * on most of the printing characters that also appear in (7-bit) ASCII.
  371. * Of these, only '|', '!', '~', '^', '[', and ']' are in question at all.
  372. *
  373. * Fortunately too, there is general agreement that codes 0x00 through
  374. * 0x3F represent control characters, 0x41 a nonbreaking space, and the
  375. * remainder printing characters.
  376. *
  377. * This is sufficient to allow us to identify EBCDIC text and to distinguish
  378. * between old-style and internationalized examples of text.
  379. */
  380. private unsigned char ebcdic_to_ascii[] = {
  381. 0, 1, 2, 3, 156, 9, 134, 127, 151, 141, 142, 11, 12, 13, 14, 15,
  382. 16, 17, 18, 19, 157, 133, 8, 135, 24, 25, 146, 143, 28, 29, 30, 31,
  383. 128, 129, 130, 131, 132, 10, 23, 27, 136, 137, 138, 139, 140, 5, 6, 7,
  384. 144, 145, 22, 147, 148, 149, 150, 4, 152, 153, 154, 155, 20, 21, 158, 26,
  385. ' ', 160, 161, 162, 163, 164, 165, 166, 167, 168, 213, '.', '<', '(', '+', '|',
  386. '&', 169, 170, 171, 172, 173, 174, 175, 176, 177, '!', '$', '*', ')', ';', '~',
  387. '-', '/', 178, 179, 180, 181, 182, 183, 184, 185, 203, ',', '%', '_', '>', '?',
  388. 186, 187, 188, 189, 190, 191, 192, 193, 194, '`', ':', '#', '@', '\'','=', '"',
  389. 195, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 196, 197, 198, 199, 200, 201,
  390. 202, 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', '^', 204, 205, 206, 207, 208,
  391. 209, 229, 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 210, 211, 212, '[', 214, 215,
  392. 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, ']', 230, 231,
  393. '{', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 232, 233, 234, 235, 236, 237,
  394. '}', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 238, 239, 240, 241, 242, 243,
  395. '\\',159, 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 244, 245, 246, 247, 248, 249,
  396. '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 250, 251, 252, 253, 254, 255
  397. };
  398. #ifdef notdef
  399. /*
  400. * The following EBCDIC-to-ASCII table may relate more closely to reality,
  401. * or at least to modern reality. It comes from
  402. *
  403. * http://ftp.s390.ibm.com/products/oe/bpxqp9.html
  404. *
  405. * and maps the characters of EBCDIC code page 1047 (the code used for
  406. * Unix-derived software on IBM's 390 systems) to the corresponding
  407. * characters from ISO 8859-1.
  408. *
  409. * If this table is used instead of the above one, some of the special
  410. * cases for the NEL character can be taken out of the code.
  411. */
  412. private unsigned char ebcdic_1047_to_8859[] = {
  413. 0x00,0x01,0x02,0x03,0x9C,0x09,0x86,0x7F,0x97,0x8D,0x8E,0x0B,0x0C,0x0D,0x0E,0x0F,
  414. 0x10,0x11,0x12,0x13,0x9D,0x0A,0x08,0x87,0x18,0x19,0x92,0x8F,0x1C,0x1D,0x1E,0x1F,
  415. 0x80,0x81,0x82,0x83,0x84,0x85,0x17,0x1B,0x88,0x89,0x8A,0x8B,0x8C,0x05,0x06,0x07,
  416. 0x90,0x91,0x16,0x93,0x94,0x95,0x96,0x04,0x98,0x99,0x9A,0x9B,0x14,0x15,0x9E,0x1A,
  417. 0x20,0xA0,0xE2,0xE4,0xE0,0xE1,0xE3,0xE5,0xE7,0xF1,0xA2,0x2E,0x3C,0x28,0x2B,0x7C,
  418. 0x26,0xE9,0xEA,0xEB,0xE8,0xED,0xEE,0xEF,0xEC,0xDF,0x21,0x24,0x2A,0x29,0x3B,0x5E,
  419. 0x2D,0x2F,0xC2,0xC4,0xC0,0xC1,0xC3,0xC5,0xC7,0xD1,0xA6,0x2C,0x25,0x5F,0x3E,0x3F,
  420. 0xF8,0xC9,0xCA,0xCB,0xC8,0xCD,0xCE,0xCF,0xCC,0x60,0x3A,0x23,0x40,0x27,0x3D,0x22,
  421. 0xD8,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0xAB,0xBB,0xF0,0xFD,0xFE,0xB1,
  422. 0xB0,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0xAA,0xBA,0xE6,0xB8,0xC6,0xA4,
  423. 0xB5,0x7E,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0xA1,0xBF,0xD0,0x5B,0xDE,0xAE,
  424. 0xAC,0xA3,0xA5,0xB7,0xA9,0xA7,0xB6,0xBC,0xBD,0xBE,0xDD,0xA8,0xAF,0x5D,0xB4,0xD7,
  425. 0x7B,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0xAD,0xF4,0xF6,0xF2,0xF3,0xF5,
  426. 0x7D,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0xB9,0xFB,0xFC,0xF9,0xFA,0xFF,
  427. 0x5C,0xF7,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB2,0xD4,0xD6,0xD2,0xD3,0xD5,
  428. 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0xB3,0xDB,0xDC,0xD9,0xDA,0x9F
  429. };
  430. #endif
  431. /*
  432. * Copy buf[0 ... nbytes-1] into out[], translating EBCDIC to ASCII.
  433. */
  434. private void
  435. from_ebcdic(const unsigned char *buf, size_t nbytes, unsigned char *out)
  436. {
  437. size_t i;
  438. for (i = 0; i < nbytes; i++) {
  439. out[i] = ebcdic_to_ascii[buf[i]];
  440. }
  441. }