2 * Copyright (c) Christos Zoulas 2003.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 FILE_RCSID("@(#)$File: funcs.c,v 1.53 2009/04/07 11:07:00 christos Exp $")
38 #if defined(HAVE_WCHAR_H)
41 #if defined(HAVE_WCTYPE_H)
44 #if defined(HAVE_LIMITS_H)
49 #define SIZE_MAX ((size_t)~0)
53 * Like printf, only we append to a buffer.
56 file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
61 len = vasprintf(&buf, fmt, ap);
65 if (ms->o.buf != NULL) {
66 len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
76 file_error(ms, errno, "vasprintf failed");
81 file_printf(struct magic_set *ms, const char *fmt, ...)
87 rv = file_vprintf(ms, fmt, ap);
93 * error - print best error message possible
97 file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
100 /* Only the first error is ok */
101 if (ms->event_flags & EVENT_HAD_ERR)
106 file_printf(ms, "line %u: ", lineno);
108 file_vprintf(ms, f, va);
110 file_printf(ms, " (%s)", strerror(error));
111 ms->event_flags |= EVENT_HAD_ERR;
117 file_error(struct magic_set *ms, int error, const char *f, ...)
121 file_error_core(ms, error, f, va, 0);
126 * Print an error with magic line number.
130 file_magerror(struct magic_set *ms, const char *f, ...)
134 file_error_core(ms, 0, f, va, ms->line);
139 file_oomem(struct magic_set *ms, size_t len)
141 file_error(ms, errno, "cannot allocate %zu bytes", len);
145 file_badseek(struct magic_set *ms)
147 file_error(ms, errno, "error seeking");
151 file_badread(struct magic_set *ms)
153 file_error(ms, errno, "error reading");
158 file_buffer(struct magic_set *ms, int fd, const char *inname, const void *buf,
161 int m = 0, rv = 0, looks_text = 0;
162 int mime = ms->flags & MAGIC_MIME;
163 const unsigned char *ubuf = CAST(const unsigned char *, buf);
164 unichar *u8buf = NULL;
166 const char *code = NULL;
167 const char *code_mime = "binary";
168 const char *type = NULL;
173 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
174 file_printf(ms, mime ? "application/x-empty" :
178 } else if (nb == 1) {
179 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
180 file_printf(ms, mime ? "application/octet-stream" :
181 "very short file (no magic)") == -1)
186 if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
187 looks_text = file_encoding(ms, ubuf, nb, &u8buf, &ulen,
188 &code, &code_mime, &type);
192 if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
193 switch (file_os2_apptype(ms, inname, buf, nb)) {
204 /* try compression stuff */
205 if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0)
206 if ((m = file_zmagic(ms, fd, inname, ubuf, nb)) != 0) {
207 if ((ms->flags & MAGIC_DEBUG) != 0)
208 (void)fprintf(stderr, "zmagic %d\n", m);
212 /* Check if we have a tar file */
213 if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0)
214 if ((m = file_is_tar(ms, ubuf, nb)) != 0) {
215 if ((ms->flags & MAGIC_DEBUG) != 0)
216 (void)fprintf(stderr, "tar %d\n", m);
220 /* Check if we have a CDF file */
221 if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0)
222 if ((m = file_trycdf(ms, fd, ubuf, nb)) != 0) {
223 if ((ms->flags & MAGIC_DEBUG) != 0)
224 (void)fprintf(stderr, "cdf %d\n", m);
228 /* try soft magic tests */
229 if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0)
230 if ((m = file_softmagic(ms, ubuf, nb, BINTEST)) != 0) {
231 if ((ms->flags & MAGIC_DEBUG) != 0)
232 (void)fprintf(stderr, "softmagic %d\n", m);
234 if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 &&
235 nb > 5 && fd != -1) {
237 * We matched something in the file, so this
238 * *might* be an ELF file, and the file is at
239 * least 5 bytes long, so if it's an ELF file
240 * it has at least one byte past the ELF magic
241 * number - try extracting information from the
242 * ELF headers that cannot easily * be
243 * extracted with rules in the magic file.
245 if ((m = file_tryelf(ms, fd, ubuf, nb)) != 0)
246 if ((ms->flags & MAGIC_DEBUG) != 0)
247 (void)fprintf(stderr,
254 /* try text properties (and possibly text tokens) */
255 if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
257 if ((m = file_ascmagic(ms, ubuf, nb)) != 0) {
258 if ((ms->flags & MAGIC_DEBUG) != 0)
259 (void)fprintf(stderr, "ascmagic %d\n", m);
263 /* try to discover text encoding */
264 if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
266 if ((m = file_ascmagic_with_encoding( ms, ubuf,
267 nb, u8buf, ulen, code, type)) != 0) {
268 if ((ms->flags & MAGIC_DEBUG) != 0)
269 (void)fprintf(stderr,
270 "ascmagic/enc %d\n", m);
278 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
279 file_printf(ms, mime ? "application/octet-stream" : "data") == -1) {
283 if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
284 if (ms->flags & MAGIC_MIME_TYPE)
285 if (file_printf(ms, "; charset=") == -1)
287 if (file_printf(ms, "%s", code_mime) == -1)
300 file_reset(struct magic_set *ms)
302 if (ms->mlist == NULL) {
303 file_error(ms, 0, "no magic files loaded");
314 ms->event_flags &= ~EVENT_HAD_ERR;
319 #define OCTALIFY(n, o) \
321 (void)(*(n)++ = '\\', \
322 *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
323 *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
324 *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
327 protected const char *
328 file_getbuffer(struct magic_set *ms)
330 char *pbuf, *op, *np;
333 if (ms->event_flags & EVENT_HAD_ERR)
336 if (ms->flags & MAGIC_RAW)
339 if (ms->o.buf == NULL)
342 /* * 4 is for octal representation, + 1 is for NUL */
343 len = strlen(ms->o.buf);
344 if (len > (SIZE_MAX - 1) / 4) {
349 if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
350 file_oomem(ms, psize);
355 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
360 size_t bytesconsumed;
362 (void)memset(&state, 0, sizeof(mbstate_t));
369 bytesconsumed = mbrtowc(&nextchar, op,
370 (size_t)(eop - op), &state);
371 if (bytesconsumed == (size_t)(-1) ||
372 bytesconsumed == (size_t)(-2)) {
377 if (iswprint(nextchar)) {
378 (void)memcpy(np, op, bytesconsumed);
382 while (bytesconsumed-- > 0)
388 /* Parsing succeeded as a multi-byte sequence */
394 for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
395 if (isprint((unsigned char)*op)) {
406 file_check_mem(struct magic_set *ms, unsigned int level)
410 if (level >= ms->c.len) {
411 len = (ms->c.len += 20) * sizeof(*ms->c.li);
412 ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
414 realloc(ms->c.li, len));
415 if (ms->c.li == NULL) {
420 ms->c.li[level].got_match = 0;
421 #ifdef ENABLE_CONDITIONALS
422 ms->c.li[level].last_match = 0;
423 ms->c.li[level].last_cond = COND_NONE;
424 #endif /* ENABLE_CONDITIONALS */