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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
29 * apprentice - make one pass through /etc/magic, learning its secrets.
35 FILE_RCSID("@(#)$File: apprentice.c,v 1.173 2011/12/08 12:38:24 rrt Exp $")
52 #define EATAB {while (isascii((unsigned char) *l) && \
53 isspace((unsigned char) *l)) ++l;}
54 #define LOWCASE(l) (isupper((unsigned char) (l)) ? \
55 tolower((unsigned char) (l)) : (l))
57 * Work around a bug in headers on Digital Unix.
58 * At least confirmed for: OSF1 V4.0 878
60 #if defined(__osf__) && defined(__DECC)
67 #define MAP_FAILED (void *) -1
80 int file_formats[FILE_NAMES_SIZE];
81 const size_t file_nformats = FILE_NAMES_SIZE;
82 const char *file_names[FILE_NAMES_SIZE];
83 const size_t file_nnames = FILE_NAMES_SIZE;
85 private int getvalue(struct magic_set *ms, struct magic *, const char **, int);
86 private int hextoint(int);
87 private const char *getstr(struct magic_set *, struct magic *, const char *,
89 private int parse(struct magic_set *, struct magic_entry **, uint32_t *,
90 const char *, size_t, int);
91 private void eatsize(const char **);
92 private int apprentice_1(struct magic_set *, const char *, int, struct mlist *);
93 private size_t apprentice_magic_strength(const struct magic *);
94 private int apprentice_sort(const void *, const void *);
96 private void apprentice_list(struct mlist *, int );
98 private int apprentice_load(struct magic_set *, struct magic **, uint32_t *,
101 private void byteswap(struct magic *, uint32_t);
102 private void bs1(struct magic *);
103 private uint16_t swap2(uint16_t);
104 private uint32_t swap4(uint32_t);
105 private uint64_t swap8(uint64_t);
107 private char *mkdbname(struct magic_set *, const char *, int);
109 private int apprentice_map(struct magic_set *, struct magic **, uint32_t *,
112 private int apprentice_compile(struct magic_set *, struct magic **, uint32_t *,
114 private int check_format_type(const char *, int);
115 private int check_format(struct magic_set *, struct magic *);
116 private int get_op(char);
117 private int parse_mime(struct magic_set *, struct magic_entry *, const char *);
118 private int parse_strength(struct magic_set *, struct magic_entry *, const char *);
119 private int parse_apple(struct magic_set *, struct magic_entry *, const char *);
122 private size_t maxmagic = 0;
123 private size_t magicsize = sizeof(struct magic);
125 private const char usg_hdr[] = "cont\toffset\ttype\topcode\tmask\tvalue\tdesc";
130 int (*fun)(struct magic_set *, struct magic_entry *, const char *);
132 #define DECLARE_FIELD(name) { # name, sizeof(# name) - 1, parse_ ## name }
134 DECLARE_FIELD(apple),
135 DECLARE_FIELD(strength),
142 int main(int, char *[]);
145 main(int argc, char *argv[])
148 struct magic_set *ms;
151 if ((progname = strrchr(argv[0], '/')) != NULL)
157 (void)fprintf(stderr, "Usage: %s file\n", progname);
161 if ((ms = magic_open(MAGIC_CHECK)) == NULL) {
162 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
165 ret = magic_compile(ms, argv[1]) == -1 ? 1 : 0;
167 (void)fprintf(stderr, "%s: %s\n", progname, magic_error(ms));
171 #endif /* COMPILE_ONLY */
173 static const struct type_tbl_s {
179 # define XX(s) s, (sizeof(s) - 1)
180 # define XX_NULL "", 0
181 { XX("byte"), FILE_BYTE, FILE_FMT_NUM },
182 { XX("short"), FILE_SHORT, FILE_FMT_NUM },
183 { XX("default"), FILE_DEFAULT, FILE_FMT_STR },
184 { XX("long"), FILE_LONG, FILE_FMT_NUM },
185 { XX("string"), FILE_STRING, FILE_FMT_STR },
186 { XX("date"), FILE_DATE, FILE_FMT_STR },
187 { XX("beshort"), FILE_BESHORT, FILE_FMT_NUM },
188 { XX("belong"), FILE_BELONG, FILE_FMT_NUM },
189 { XX("bedate"), FILE_BEDATE, FILE_FMT_STR },
190 { XX("leshort"), FILE_LESHORT, FILE_FMT_NUM },
191 { XX("lelong"), FILE_LELONG, FILE_FMT_NUM },
192 { XX("ledate"), FILE_LEDATE, FILE_FMT_STR },
193 { XX("pstring"), FILE_PSTRING, FILE_FMT_STR },
194 { XX("ldate"), FILE_LDATE, FILE_FMT_STR },
195 { XX("beldate"), FILE_BELDATE, FILE_FMT_STR },
196 { XX("leldate"), FILE_LELDATE, FILE_FMT_STR },
197 { XX("regex"), FILE_REGEX, FILE_FMT_STR },
198 { XX("bestring16"), FILE_BESTRING16, FILE_FMT_STR },
199 { XX("lestring16"), FILE_LESTRING16, FILE_FMT_STR },
200 { XX("search"), FILE_SEARCH, FILE_FMT_STR },
201 { XX("medate"), FILE_MEDATE, FILE_FMT_STR },
202 { XX("meldate"), FILE_MELDATE, FILE_FMT_STR },
203 { XX("melong"), FILE_MELONG, FILE_FMT_NUM },
204 { XX("quad"), FILE_QUAD, FILE_FMT_QUAD },
205 { XX("lequad"), FILE_LEQUAD, FILE_FMT_QUAD },
206 { XX("bequad"), FILE_BEQUAD, FILE_FMT_QUAD },
207 { XX("qdate"), FILE_QDATE, FILE_FMT_STR },
208 { XX("leqdate"), FILE_LEQDATE, FILE_FMT_STR },
209 { XX("beqdate"), FILE_BEQDATE, FILE_FMT_STR },
210 { XX("qldate"), FILE_QLDATE, FILE_FMT_STR },
211 { XX("leqldate"), FILE_LEQLDATE, FILE_FMT_STR },
212 { XX("beqldate"), FILE_BEQLDATE, FILE_FMT_STR },
213 { XX("float"), FILE_FLOAT, FILE_FMT_FLOAT },
214 { XX("befloat"), FILE_BEFLOAT, FILE_FMT_FLOAT },
215 { XX("lefloat"), FILE_LEFLOAT, FILE_FMT_FLOAT },
216 { XX("double"), FILE_DOUBLE, FILE_FMT_DOUBLE },
217 { XX("bedouble"), FILE_BEDOUBLE, FILE_FMT_DOUBLE },
218 { XX("ledouble"), FILE_LEDOUBLE, FILE_FMT_DOUBLE },
219 { XX("leid3"), FILE_LEID3, FILE_FMT_NUM },
220 { XX("beid3"), FILE_BEID3, FILE_FMT_NUM },
221 { XX("indirect"), FILE_INDIRECT, FILE_FMT_NONE },
222 { XX_NULL, FILE_INVALID, FILE_FMT_NONE },
228 get_type(const char *l, const char **t)
230 const struct type_tbl_s *p;
232 for (p = type_tbl; p->len; p++) {
233 if (strncmp(l, p->name, p->len) == 0) {
243 init_file_tables(void)
246 const struct type_tbl_s *p;
252 for (p = type_tbl; p->len; p++) {
253 assert(p->type < FILE_NAMES_SIZE);
254 file_names[p->type] = p->name;
255 file_formats[p->type] = p->format;
260 * Handle one file or directory.
263 apprentice_1(struct magic_set *ms, const char *fn, int action,
266 struct magic *magic = NULL;
276 if (magicsize != FILE_MAGICSIZE) {
277 file_error(ms, 0, "magic element size %lu != %lu",
278 (unsigned long)sizeof(*magic),
279 (unsigned long)FILE_MAGICSIZE);
283 if (action == FILE_COMPILE) {
284 rv = apprentice_load(ms, &magic, &nmagic, fn, action);
287 rv = apprentice_compile(ms, &magic, &nmagic, fn);
293 if ((rv = apprentice_map(ms, &magic, &nmagic, fn)) == -1) {
294 if (ms->flags & MAGIC_CHECK)
295 file_magwarn(ms, "using regular magic file `%s'", fn);
296 rv = apprentice_load(ms, &magic, &nmagic, fn, action);
304 file_delmagic(magic, mapped, nmagic);
308 if ((ml = CAST(struct mlist *, malloc(sizeof(*ml)))) == NULL) {
309 file_delmagic(magic, mapped, nmagic);
310 file_oomem(ms, sizeof(*ml));
318 mlist->prev->next = ml;
319 ml->prev = mlist->prev;
323 if (action == FILE_LIST) {
324 printf("Binary patterns:\n");
325 apprentice_list(mlist, BINTEST);
326 printf("Text patterns:\n");
327 apprentice_list(mlist, TEXTTEST);
329 #endif /* COMPILE_ONLY */
334 file_delmagic(struct magic *p, int type, size_t entries)
342 (void)munmap((void *)p, sizeof(*p) * (entries + 1));
360 /* const char *fn: list of magic files and directories */
361 protected struct mlist *
362 file_apprentice(struct magic_set *ms, const char *fn, int action)
365 int file_err, errs = -1;
368 if ((fn = magic_getpath(fn, action)) == NULL)
373 if ((mfn = strdup(fn)) == NULL) {
374 file_oomem(ms, strlen(fn));
379 if ((mlist = CAST(struct mlist *, malloc(sizeof(*mlist)))) == NULL) {
381 file_oomem(ms, sizeof(*mlist));
384 mlist->next = mlist->prev = mlist;
387 p = strchr(fn, PATHSEP);
392 file_err = apprentice_1(ms, fn, action, mlist);
393 errs = MAX(errs, file_err);
400 file_error(ms, 0, "could not find any magic files!");
408 * Get weight of this magic entry, for sorting purposes.
411 apprentice_magic_strength(const struct magic *m)
414 size_t val = 2 * MULT; /* baseline strength */
417 case FILE_DEFAULT: /* make sure this sorts last */
418 if (m->factor_op != FILE_FACTOR_OP_NONE)
441 val += m->vallen * MULT;
444 case FILE_BESTRING16:
445 case FILE_LESTRING16:
446 val += m->vallen * MULT / 2;
451 val += m->vallen * MAX(MULT / m->vallen, 1);
485 (void)fprintf(stderr, "Bad type %d\n", m->type);
490 case 'x': /* matches anything penalize */
491 case '!': /* matches almost anything penalize */
495 case '=': /* Exact match, prefer */
500 case '<': /* comparison match reduce strength */
505 case '&': /* masking bits, we could count them too */
510 (void)fprintf(stderr, "Bad relation %c\n", m->reln);
514 if (val == 0) /* ensure we only return 0 for FILE_DEFAULT */
517 switch (m->factor_op) {
518 case FILE_FACTOR_OP_NONE:
520 case FILE_FACTOR_OP_PLUS:
523 case FILE_FACTOR_OP_MINUS:
526 case FILE_FACTOR_OP_TIMES:
529 case FILE_FACTOR_OP_DIV:
537 * Magic entries with no description get a bonus because they depend
538 * on subsequent magic entries to print something.
540 if (m->desc[0] == '\0')
546 * Sort callback for sorting entries by "strength" (basically length)
549 apprentice_sort(const void *a, const void *b)
551 const struct magic_entry *ma = CAST(const struct magic_entry *, a);
552 const struct magic_entry *mb = CAST(const struct magic_entry *, b);
553 size_t sa = apprentice_magic_strength(ma->mp);
554 size_t sb = apprentice_magic_strength(mb->mp);
564 * Shows sorted patterns list in the order which is used for the matching
568 apprentice_list(struct mlist *mlist, int mode)
570 uint32_t magindex = 0;
572 for (ml = mlist->next; ml != mlist; ml = ml->next) {
573 for (magindex = 0; magindex < ml->nmagic; magindex++) {
574 struct magic *m = &ml->magic[magindex];
575 if ((m->flag & mode) != mode) {
577 while (magindex + 1 < ml->nmagic &&
578 ml->magic[magindex + 1].cont_level != 0)
580 continue; /* Skip to next top-level test*/
584 * Try to iterate over the tree until we find item with
585 * description/mimetype.
587 while (magindex + 1 < ml->nmagic &&
588 ml->magic[magindex + 1].cont_level != 0 &&
589 *ml->magic[magindex].desc == '\0' &&
590 *ml->magic[magindex].mimetype == '\0')
593 printf("Strength = %3" SIZE_T_FORMAT "u : %s [%s]\n",
594 apprentice_magic_strength(m),
595 ml->magic[magindex].desc,
596 ml->magic[magindex].mimetype);
600 #endif /* COMPILE_ONLY */
603 set_test_type(struct magic *mstart, struct magic *m)
637 mstart->flag |= BINTEST;
641 case FILE_BESTRING16:
642 case FILE_LESTRING16:
643 /* Allow text overrides */
644 if (mstart->str_flags & STRING_TEXTTEST)
645 mstart->flag |= TEXTTEST;
647 mstart->flag |= BINTEST;
651 /* Check for override */
652 if (mstart->str_flags & STRING_BINTEST)
653 mstart->flag |= BINTEST;
654 if (mstart->str_flags & STRING_TEXTTEST)
655 mstart->flag |= TEXTTEST;
657 if (mstart->flag & (TEXTTEST|BINTEST))
660 /* binary test if pattern is not text */
661 if (file_looks_utf8(m->value.us, (size_t)m->vallen, NULL,
663 mstart->flag |= BINTEST;
665 mstart->flag |= TEXTTEST;
668 /* can't deduce anything; we shouldn't see this at the
673 /* invalid search type, but no need to complain here */
679 * Load and parse one file.
682 load_1(struct magic_set *ms, int action, const char *fn, int *errs,
683 struct magic_entry **marray, uint32_t *marraycount)
685 size_t lineno = 0, llen = 0;
689 FILE *f = fopen(ms->file = fn, "r");
692 file_error(ms, errno, "cannot read magic file `%s'",
698 /* read and parse this file */
699 for (ms->line = 1; (len = getline(&line, &llen, f)) != -1;
701 if (len == 0) /* null line, garbage, etc */
703 if (line[len - 1] == '\n') {
705 line[len - 1] = '\0'; /* delete newline */
708 case '\0': /* empty, do not parse */
709 case '#': /* comment, do not parse */
712 if (line[1] == ':') {
715 for (i = 0; bang[i].name != NULL; i++) {
716 if ((size_t)(len - 2) > bang[i].len &&
717 memcmp(bang[i].name, line + 2,
721 if (bang[i].name == NULL) {
723 "Unknown !: entry `%s'", line);
727 if (*marraycount == 0) {
729 "No current entry for :!%s type",
734 if ((*bang[i].fun)(ms,
735 &(*marray)[*marraycount - 1],
736 line + bang[i].len + 2) != 0) {
744 if (parse(ms, marray, marraycount, line, lineno,
755 * parse a file or directory of files
756 * const char *fn: name of magic file or directory
759 cmpstrp(const void *p1, const void *p2)
761 return strcmp(*(char *const *)p1, *(char *const *)p2);
765 apprentice_load(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp,
766 const char *fn, int action)
769 struct magic_entry *marray;
770 uint32_t marraycount, i, mentrycount = 0, starttest;
771 size_t slen, files = 0, maxfiles = 0;
772 char **filearr = NULL, *mfn;
777 ms->flags |= MAGIC_CHECK; /* Enable checks for parsed files */
780 if ((marray = CAST(struct magic_entry *, calloc(maxmagic,
781 sizeof(*marray)))) == NULL) {
782 file_oomem(ms, maxmagic * sizeof(*marray));
787 /* print silly verbose header for USG compat. */
788 if (action == FILE_CHECK)
789 (void)fprintf(stderr, "%s\n", usg_hdr);
791 /* load directory or file */
792 if (stat(fn, &st) == 0 && S_ISDIR(st.st_mode)) {
798 while ((d = readdir(dir)) != NULL) {
799 if (asprintf(&mfn, "%s/%s", fn, d->d_name) < 0) {
801 strlen(fn) + strlen(d->d_name) + 2);
806 if (stat(mfn, &st) == -1 || !S_ISREG(st.st_mode)) {
810 if (files >= maxfiles) {
812 maxfiles = (maxfiles + 1) * 2;
813 mlen = maxfiles * sizeof(*filearr);
814 if ((filearr = CAST(char **,
815 realloc(filearr, mlen))) == NULL) {
816 file_oomem(ms, mlen);
823 filearr[files++] = mfn;
826 qsort(filearr, files, sizeof(*filearr), cmpstrp);
827 for (i = 0; i < files; i++) {
828 load_1(ms, action, filearr[i], &errs, &marray,
834 load_1(ms, action, fn, &errs, &marray, &marraycount);
838 /* Set types of tests */
839 for (i = 0; i < marraycount; ) {
840 if (marray[i].mp->cont_level != 0) {
847 static const char text[] = "text";
848 static const char binary[] = "binary";
849 static const size_t len = sizeof(text);
850 set_test_type(marray[starttest].mp, marray[i].mp);
851 if ((ms->flags & MAGIC_DEBUG) == 0)
853 (void)fprintf(stderr, "%s%s%s: %s\n",
854 marray[i].mp->mimetype,
855 marray[i].mp->mimetype[0] == '\0' ? "" : "; ",
856 marray[i].mp->desc[0] ? marray[i].mp->desc :
858 marray[i].mp->flag & BINTEST ? binary : text);
859 if (marray[i].mp->flag & BINTEST) {
860 char *p = strstr(marray[i].mp->desc, text);
861 if (p && (p == marray[i].mp->desc ||
862 isspace((unsigned char)p[-1])) &&
863 (p + len - marray[i].mp->desc ==
864 MAXstring || (p[len] == '\0' ||
865 isspace((unsigned char)p[len]))))
866 (void)fprintf(stderr, "*** Possible "
867 "binary test for text type\n");
869 } while (++i < marraycount && marray[i].mp->cont_level != 0);
872 qsort(marray, marraycount, sizeof(*marray), apprentice_sort);
875 * Make sure that any level 0 "default" line is last (if one exists).
877 for (i = 0; i < marraycount; i++) {
878 if (marray[i].mp->cont_level == 0 &&
879 marray[i].mp->type == FILE_DEFAULT) {
880 while (++i < marraycount)
881 if (marray[i].mp->cont_level == 0)
883 if (i != marraycount) {
885 ms->line = marray[i].mp->lineno;
887 "level 0 \"default\" did not sort last");
893 for (i = 0; i < marraycount; i++)
894 mentrycount += marray[i].cont_count;
896 slen = sizeof(**magicp) * mentrycount;
897 if ((*magicp = CAST(struct magic *, malloc(slen))) == NULL) {
898 file_oomem(ms, slen);
904 for (i = 0; i < marraycount; i++) {
905 (void)memcpy(*magicp + mentrycount, marray[i].mp,
906 marray[i].cont_count * sizeof(**magicp));
907 mentrycount += marray[i].cont_count;
910 for (i = 0; i < marraycount; i++)
918 *nmagicp = mentrycount;
925 * extend the sign bit if the comparison is to be signed
928 file_signextend(struct magic_set *ms, struct magic *m, uint64_t v)
930 if (!(m->flag & UNSIGNED)) {
933 * Do not remove the casts below. They are
934 * vital. When later compared with the data,
935 * the sign extension must have happened.
978 case FILE_BESTRING16:
979 case FILE_LESTRING16:
986 if (ms->flags & MAGIC_CHECK)
987 file_magwarn(ms, "cannot happen: m->type=%d\n",
996 string_modifier_check(struct magic_set *ms, struct magic *m)
998 if ((ms->flags & MAGIC_CHECK) == 0)
1001 if (m->type != FILE_PSTRING && (m->str_flags & PSTRING_LEN) != 0) {
1003 "'/BHhLl' modifiers are only allowed for pascal strings\n");
1007 case FILE_BESTRING16:
1008 case FILE_LESTRING16:
1009 if (m->str_flags != 0) {
1011 "no modifiers allowed for 16-bit strings\n");
1017 if ((m->str_flags & REGEX_OFFSET_START) != 0) {
1019 "'/%c' only allowed on regex and search\n",
1020 CHAR_REGEX_OFFSET_START);
1025 if (m->str_range == 0) {
1027 "missing range; defaulting to %d\n",
1028 STRING_DEFAULT_RANGE);
1029 m->str_range = STRING_DEFAULT_RANGE;
1034 if ((m->str_flags & STRING_COMPACT_WHITESPACE) != 0) {
1035 file_magwarn(ms, "'/%c' not allowed on regex\n",
1036 CHAR_COMPACT_WHITESPACE);
1039 if ((m->str_flags & STRING_COMPACT_OPTIONAL_WHITESPACE) != 0) {
1040 file_magwarn(ms, "'/%c' not allowed on regex\n",
1041 CHAR_COMPACT_OPTIONAL_WHITESPACE);
1046 file_magwarn(ms, "coding error: m->type=%d\n",
1066 return FILE_OPMINUS;
1068 return FILE_OPMULTIPLY;
1070 return FILE_OPDIVIDE;
1072 return FILE_OPMODULO;
1078 #ifdef ENABLE_CONDITIONALS
1080 get_cond(const char *l, const char **t)
1082 static const struct cond_tbl_s {
1087 { "if", 2, COND_IF },
1088 { "elif", 4, COND_ELIF },
1089 { "else", 4, COND_ELSE },
1090 { "", 0, COND_NONE },
1092 const struct cond_tbl_s *p;
1094 for (p = cond_tbl; p->len; p++) {
1095 if (strncmp(l, p->name, p->len) == 0 &&
1096 isspace((unsigned char)l[p->len])) {
1106 check_cond(struct magic_set *ms, int cond, uint32_t cont_level)
1109 last_cond = ms->c.li[cont_level].last_cond;
1113 if (last_cond != COND_NONE && last_cond != COND_ELIF) {
1114 if (ms->flags & MAGIC_CHECK)
1115 file_magwarn(ms, "syntax error: `if'");
1118 last_cond = COND_IF;
1122 if (last_cond != COND_IF && last_cond != COND_ELIF) {
1123 if (ms->flags & MAGIC_CHECK)
1124 file_magwarn(ms, "syntax error: `elif'");
1127 last_cond = COND_ELIF;
1131 if (last_cond != COND_IF && last_cond != COND_ELIF) {
1132 if (ms->flags & MAGIC_CHECK)
1133 file_magwarn(ms, "syntax error: `else'");
1136 last_cond = COND_NONE;
1140 last_cond = COND_NONE;
1144 ms->c.li[cont_level].last_cond = last_cond;
1147 #endif /* ENABLE_CONDITIONALS */
1150 * parse one line from magic file, put into magic[index++] if valid
1153 parse(struct magic_set *ms, struct magic_entry **mentryp, uint32_t *nmentryp,
1154 const char *line, size_t lineno, int action)
1156 #ifdef ENABLE_CONDITIONALS
1157 static uint32_t last_cont_level = 0;
1160 struct magic_entry *me;
1162 const char *l = line;
1165 uint32_t cont_level;
1170 ++l; /* step over */
1173 #ifdef ENABLE_CONDITIONALS
1174 if (cont_level == 0 || cont_level > last_cont_level)
1175 if (file_check_mem(ms, cont_level) == -1)
1177 last_cont_level = cont_level;
1180 #define ALLOC_CHUNK (size_t)10
1181 #define ALLOC_INCR (size_t)200
1183 if (cont_level != 0) {
1184 if (*nmentryp == 0) {
1185 file_error(ms, 0, "No current entry for continuation");
1188 me = &(*mentryp)[*nmentryp - 1];
1189 if (me->cont_count == me->max_count) {
1191 size_t cnt = me->max_count + ALLOC_CHUNK;
1192 if ((nm = CAST(struct magic *, realloc(me->mp,
1193 sizeof(*nm) * cnt))) == NULL) {
1194 file_oomem(ms, sizeof(*nm) * cnt);
1198 me->max_count = CAST(uint32_t, cnt);
1200 m = &me->mp[me->cont_count++];
1201 (void)memset(m, 0, sizeof(*m));
1202 m->cont_level = cont_level;
1204 if (*nmentryp == maxmagic) {
1205 struct magic_entry *mp;
1207 maxmagic += ALLOC_INCR;
1208 if ((mp = CAST(struct magic_entry *,
1209 realloc(*mentryp, sizeof(*mp) * maxmagic))) ==
1211 file_oomem(ms, sizeof(*mp) * maxmagic);
1214 (void)memset(&mp[*nmentryp], 0, sizeof(*mp) *
1218 me = &(*mentryp)[*nmentryp];
1219 if (me->mp == NULL) {
1220 size_t len = sizeof(*m) * ALLOC_CHUNK;
1221 if ((m = CAST(struct magic *, malloc(len))) == NULL) {
1222 file_oomem(ms, len);
1226 me->max_count = ALLOC_CHUNK;
1229 (void)memset(m, 0, sizeof(*m));
1230 m->factor_op = FILE_FACTOR_OP_NONE;
1234 m->lineno = CAST(uint32_t, lineno);
1236 if (*l == '&') { /* m->cont_level == 0 checked below. */
1237 ++l; /* step over */
1241 ++l; /* step over */
1243 if (m->flag & OFFADD)
1244 m->flag = (m->flag & ~OFFADD) | INDIROFFADD;
1246 if (*l == '&') { /* m->cont_level == 0 checked below */
1247 ++l; /* step over */
1251 /* Indirect offsets are not valid at level 0. */
1252 if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD)))
1253 if (ms->flags & MAGIC_CHECK)
1254 file_magwarn(ms, "relative offset at level 0");
1256 /* get offset, then skip over it */
1257 m->offset = (uint32_t)strtoul(l, &t, 0);
1259 if (ms->flags & MAGIC_CHECK)
1260 file_magwarn(ms, "offset `%s' invalid", l);
1263 if (m->flag & INDIR) {
1264 m->in_type = FILE_LONG;
1267 * read [.lbs][+-]nnnnn)
1273 m->in_type = FILE_LELONG;
1276 m->in_type = FILE_BELONG;
1279 m->in_type = FILE_MELONG;
1283 m->in_type = FILE_LESHORT;
1287 m->in_type = FILE_BESHORT;
1293 m->in_type = FILE_BYTE;
1298 m->in_type = FILE_LEDOUBLE;
1303 m->in_type = FILE_BEDOUBLE;
1306 m->in_type = FILE_LEID3;
1309 m->in_type = FILE_BEID3;
1312 if (ms->flags & MAGIC_CHECK)
1314 "indirect offset type `%c' invalid",
1323 m->in_op |= FILE_OPINVERSE;
1326 if ((op = get_op(*l)) != -1) {
1331 m->in_op |= FILE_OPINDIRECT;
1334 if (isdigit((unsigned char)*l) || *l == '-') {
1335 m->in_offset = (int32_t)strtol(l, &t, 0);
1337 if (ms->flags & MAGIC_CHECK)
1339 "in_offset `%s' invalid", l);
1343 ((m->in_op & FILE_OPINDIRECT) && *l++ != ')'))
1344 if (ms->flags & MAGIC_CHECK)
1346 "missing ')' in indirect offset");
1350 #ifdef ENABLE_CONDITIONALS
1351 m->cond = get_cond(l, &l);
1352 if (check_cond(ms, m->cond, cont_level) == -1)
1360 m->flag |= UNSIGNED;
1363 m->type = get_type(l, &l);
1364 if (m->type == FILE_INVALID) {
1365 if (ms->flags & MAGIC_CHECK)
1366 file_magwarn(ms, "type `%s' invalid", l);
1370 /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
1371 /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */
1375 if (!IS_STRING(m->type))
1376 m->mask_op |= FILE_OPINVERSE;
1377 else if (ms->flags & MAGIC_CHECK)
1378 file_magwarn(ms, "'~' invalid for string types");
1382 m->str_flags = m->type == FILE_PSTRING ? PSTRING_1_LE : 0;
1383 if ((op = get_op(*l)) != -1) {
1384 if (!IS_STRING(m->type)) {
1388 val = (uint64_t)strtoull(l, &t, 0);
1390 m->num_mask = file_signextend(ms, m, val);
1393 else if (op == FILE_OPDIVIDE) {
1395 while (!isspace((unsigned char)*++l)) {
1397 case '0': case '1': case '2':
1398 case '3': case '4': case '5':
1399 case '6': case '7': case '8':
1402 (ms->flags & MAGIC_CHECK))
1406 m->str_range = CAST(uint32_t,
1408 if (m->str_range == 0)
1413 case CHAR_COMPACT_WHITESPACE:
1415 STRING_COMPACT_WHITESPACE;
1417 case CHAR_COMPACT_OPTIONAL_WHITESPACE:
1419 STRING_COMPACT_OPTIONAL_WHITESPACE;
1421 case CHAR_IGNORE_LOWERCASE:
1422 m->str_flags |= STRING_IGNORE_LOWERCASE;
1424 case CHAR_IGNORE_UPPERCASE:
1425 m->str_flags |= STRING_IGNORE_UPPERCASE;
1427 case CHAR_REGEX_OFFSET_START:
1428 m->str_flags |= REGEX_OFFSET_START;
1431 m->str_flags |= STRING_BINTEST;
1434 m->str_flags |= STRING_TEXTTEST;
1436 case CHAR_PSTRING_1_LE:
1437 if (m->type != FILE_PSTRING)
1439 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_1_LE;
1441 case CHAR_PSTRING_2_BE:
1442 if (m->type != FILE_PSTRING)
1444 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_BE;
1446 case CHAR_PSTRING_2_LE:
1447 if (m->type != FILE_PSTRING)
1449 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_LE;
1451 case CHAR_PSTRING_4_BE:
1452 if (m->type != FILE_PSTRING)
1454 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_BE;
1456 case CHAR_PSTRING_4_LE:
1457 if (m->type != FILE_PSTRING)
1459 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_LE;
1461 case CHAR_PSTRING_LENGTH_INCLUDES_ITSELF:
1462 if (m->type != FILE_PSTRING)
1464 m->str_flags |= PSTRING_LENGTH_INCLUDES_ITSELF;
1468 if (ms->flags & MAGIC_CHECK)
1470 "string extension `%c' "
1474 /* allow multiple '/' for readability */
1476 !isspace((unsigned char)l[2]))
1479 if (string_modifier_check(ms, m) == -1)
1483 if (ms->flags & MAGIC_CHECK)
1484 file_magwarn(ms, "invalid string op: %c", *t);
1489 * We used to set mask to all 1's here, instead let's just not do
1490 * anything if mask = 0 (unless you have a better idea)
1500 if (ms->flags & MAGIC_CHECK) {
1501 file_magwarn(ms, "%c= not supported",
1508 /* Old-style anding: "0 byte &0x80 dynamically linked" */
1515 /* HP compat: ignore &= etc. */
1524 m->reln = '='; /* the default relation */
1525 if (*l == 'x' && ((isascii((unsigned char)l[1]) &&
1526 isspace((unsigned char)l[1])) || !l[1])) {
1533 * Grab the value part, except for an 'x' reln.
1535 if (m->reln != 'x' && getvalue(ms, m, &l, action))
1539 * TODO finish this macro and start using it!
1540 * #define offsetcheck {if (offset > HOWMANY-1)
1541 * magwarn("offset too big"); }
1545 * Now get last part - the description
1551 } else if ((l[0] == '\\') && (l[1] == 'b')) {
1556 for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof(m->desc); )
1558 if (i == sizeof(m->desc)) {
1559 m->desc[sizeof(m->desc) - 1] = '\0';
1560 if (ms->flags & MAGIC_CHECK)
1561 file_magwarn(ms, "description `%s' truncated", m->desc);
1565 * We only do this check while compiling, or if any of the magic
1566 * files were not compiled.
1568 if (ms->flags & MAGIC_CHECK) {
1569 if (check_format(ms, m) == -1)
1572 #ifndef COMPILE_ONLY
1573 if (action == FILE_CHECK) {
1577 m->mimetype[0] = '\0'; /* initialise MIME type to none */
1578 if (m->cont_level == 0)
1579 ++(*nmentryp); /* make room for next */
1584 * parse a STRENGTH annotation line from magic file, put into magic[index - 1]
1588 parse_strength(struct magic_set *ms, struct magic_entry *me, const char *line)
1590 const char *l = line;
1592 unsigned long factor;
1593 struct magic *m = &me->mp[0];
1595 if (m->factor_op != FILE_FACTOR_OP_NONE) {
1597 "Current entry already has a strength type: %c %d",
1598 m->factor_op, m->factor);
1603 case FILE_FACTOR_OP_NONE:
1604 case FILE_FACTOR_OP_PLUS:
1605 case FILE_FACTOR_OP_MINUS:
1606 case FILE_FACTOR_OP_TIMES:
1607 case FILE_FACTOR_OP_DIV:
1608 m->factor_op = *l++;
1611 file_magwarn(ms, "Unknown factor op `%c'", *l);
1615 factor = strtoul(l, &el, 0);
1617 file_magwarn(ms, "Too large factor `%lu'", factor);
1620 if (*el && !isspace((unsigned char)*el)) {
1621 file_magwarn(ms, "Bad factor `%s'", l);
1624 m->factor = (uint8_t)factor;
1625 if (m->factor == 0 && m->factor_op == FILE_FACTOR_OP_DIV) {
1626 file_magwarn(ms, "Cannot have factor op `%c' and factor %u",
1627 m->factor_op, m->factor);
1632 m->factor_op = FILE_FACTOR_OP_NONE;
1638 * Parse an Apple CREATOR/TYPE annotation from magic file and put it into
1642 parse_apple(struct magic_set *ms, struct magic_entry *me, const char *line)
1645 const char *l = line;
1646 struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
1648 if (m->apple[0] != '\0') {
1649 file_magwarn(ms, "Current entry already has a APPLE type "
1650 "`%.8s', new type `%s'", m->mimetype, l);
1655 for (i = 0; *l && ((isascii((unsigned char)*l) &&
1656 isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
1657 i < sizeof(m->apple); m->apple[i++] = *l++)
1659 if (i == sizeof(m->apple) && *l) {
1660 /* We don't need to NUL terminate here, printing handles it */
1661 if (ms->flags & MAGIC_CHECK)
1662 file_magwarn(ms, "APPLE type `%s' truncated %"
1663 SIZE_T_FORMAT "u", line, i);
1673 * parse a MIME annotation line from magic file, put into magic[index - 1]
1677 parse_mime(struct magic_set *ms, struct magic_entry *me, const char *line)
1680 const char *l = line;
1681 struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
1683 if (m->mimetype[0] != '\0') {
1684 file_magwarn(ms, "Current entry already has a MIME type `%s',"
1685 " new type `%s'", m->mimetype, l);
1690 for (i = 0; *l && ((isascii((unsigned char)*l) &&
1691 isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
1692 i < sizeof(m->mimetype); m->mimetype[i++] = *l++)
1694 if (i == sizeof(m->mimetype)) {
1695 m->mimetype[sizeof(m->mimetype) - 1] = '\0';
1696 if (ms->flags & MAGIC_CHECK)
1697 file_magwarn(ms, "MIME type `%s' truncated %"
1698 SIZE_T_FORMAT "u", m->mimetype, i);
1700 m->mimetype[i] = '\0';
1709 check_format_type(const char *ptr, int type)
1713 /* Missing format string; bad */
1726 while (isdigit((unsigned char)*ptr)) ptr++;
1729 while (isdigit((unsigned char)*ptr)) ptr++;
1781 case FILE_FMT_FLOAT:
1782 case FILE_FMT_DOUBLE:
1787 while (isdigit((unsigned char)*ptr)) ptr++;
1790 while (isdigit((unsigned char)*ptr)) ptr++;
1809 while (isdigit((unsigned char )*ptr))
1813 while (isdigit((unsigned char )*ptr))
1825 /* internal error */
1833 * Check that the optional printf format in description matches
1834 * the type of the magic.
1837 check_format(struct magic_set *ms, struct magic *m)
1841 for (ptr = m->desc; *ptr; ptr++)
1845 /* No format string; ok */
1849 assert(file_nformats == file_nnames);
1851 if (m->type >= file_nformats) {
1852 file_magwarn(ms, "Internal error inconsistency between "
1853 "m->type and format strings");
1856 if (file_formats[m->type] == FILE_FMT_NONE) {
1857 file_magwarn(ms, "No format string for `%s' with description "
1858 "`%s'", m->desc, file_names[m->type]);
1863 if (check_format_type(ptr, file_formats[m->type]) == -1) {
1865 * TODO: this error message is unhelpful if the format
1866 * string is not one character long
1868 file_magwarn(ms, "Printf format `%c' is not valid for type "
1869 "`%s' in description `%s'", *ptr ? *ptr : '?',
1870 file_names[m->type], m->desc);
1874 for (; *ptr; ptr++) {
1877 "Too many format strings (should have at most one) "
1878 "for `%s' with description `%s'",
1879 file_names[m->type], m->desc);
1887 * Read a numeric value from a pointer, into the value union of a magic
1888 * pointer, according to the magic type. Update the string pointer to point
1889 * just after the number read. Return 0 for success, non-zero for failure.
1892 getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
1895 case FILE_BESTRING16:
1896 case FILE_LESTRING16:
1901 *p = getstr(ms, m, *p, action == FILE_COMPILE);
1903 if (ms->flags & MAGIC_CHECK)
1904 file_magwarn(ms, "cannot get string from `%s'",
1912 if (m->reln != 'x') {
1915 m->value.f = strtof(*p, &ep);
1917 m->value.f = (float)strtod(*p, &ep);
1925 if (m->reln != 'x') {
1927 m->value.d = strtod(*p, &ep);
1932 if (m->reln != 'x') {
1934 m->value.q = file_signextend(ms, m,
1935 (uint64_t)strtoull(*p, &ep, 0));
1944 * Convert a string containing C character escapes. Stop at an unescaped
1946 * Copy the converted version to "m->value.s", and the length in m->vallen.
1947 * Return updated scan pointer as function result. Warn if set.
1949 private const char *
1950 getstr(struct magic_set *ms, struct magic *m, const char *s, int warn)
1952 const char *origs = s;
1953 char *p = m->value.s;
1954 size_t plen = sizeof(m->value.s);
1956 char *pmax = p + plen - 1;
1960 while ((c = *s++) != '\0') {
1961 if (isspace((unsigned char) c))
1964 file_error(ms, 0, "string too long: `%s'", origs);
1972 file_magwarn(ms, "incomplete escape");
1978 "escaped tab found, use \\t instead");
1979 warn = 0; /* already did */
1984 if (isprint((unsigned char)c)) {
1985 /* Allow escaping of
1987 if (strchr("<>&^=!", c) == NULL
1988 && (m->type != FILE_REGEX ||
1989 strchr("[]().*?^$|{}", c)
1991 file_magwarn(ms, "no "
1997 "unknown escape sequence: "
2002 /* space, perhaps force people to use \040? */
2006 * Other things people escape, but shouldn't need to,
2007 * so we disallow them
2020 /* and baskslash itself */
2053 /* \ and up to 3 octal digits */
2063 c = *s++; /* try for 2 */
2064 if (c >= '0' && c <= '7') {
2065 val = (val << 3) | (c - '0');
2066 c = *s++; /* try for 3 */
2067 if (c >= '0' && c <= '7')
2068 val = (val << 3) | (c-'0');
2077 /* \x and up to 2 hex digits */
2079 val = 'x'; /* Default if no digits */
2080 c = hextoint(*s++); /* Get next char */
2085 val = (val << 4) + c;
2098 m->vallen = CAST(unsigned char, (p - origp));
2099 if (m->type == FILE_PSTRING)
2100 m->vallen += (unsigned char)file_pstring_length_size(m);
2105 /* Single hex char to int; -1 if not a hex char. */
2109 if (!isascii((unsigned char) c))
2111 if (isdigit((unsigned char) c))
2113 if ((c >= 'a') && (c <= 'f'))
2114 return c + 10 - 'a';
2115 if (( c>= 'A') && (c <= 'F'))
2116 return c + 10 - 'A';
2122 * Print a string containing C character escapes.
2125 file_showstr(FILE *fp, const char *s, size_t len)
2140 if (c >= 040 && c <= 0176) /* TODO isprint && !iscntrl */
2141 (void) fputc(c, fp);
2143 (void) fputc('\\', fp);
2146 (void) fputc('a', fp);
2150 (void) fputc('b', fp);
2154 (void) fputc('f', fp);
2158 (void) fputc('n', fp);
2162 (void) fputc('r', fp);
2166 (void) fputc('t', fp);
2170 (void) fputc('v', fp);
2174 (void) fprintf(fp, "%.3o", c & 0377);
2182 * eatsize(): Eat the size spec from a number [eg. 10UL]
2185 eatsize(const char **p)
2189 if (LOWCASE(*l) == 'u')
2192 switch (LOWCASE(*l)) {
2193 case 'l': /* long */
2194 case 's': /* short */
2195 case 'h': /* short */
2196 case 'b': /* char/byte */
2197 case 'c': /* char/byte */
2207 #ifndef COMPILE_ONLY
2209 * handle a compiled file.
2212 apprentice_map(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp,
2220 char *dbname = NULL;
2223 dbname = mkdbname(ms, fn, 0);
2227 if ((fd = open(dbname, O_RDONLY|O_BINARY)) == -1)
2230 if (fstat(fd, &st) == -1) {
2231 file_error(ms, errno, "cannot stat `%s'", dbname);
2234 if (st.st_size < 8) {
2235 file_error(ms, 0, "file `%s' is too small", dbname);
2240 if ((mm = mmap(0, (size_t)st.st_size, PROT_READ|PROT_WRITE,
2241 MAP_PRIVATE|MAP_FILE, fd, (off_t)0)) == MAP_FAILED) {
2242 file_error(ms, errno, "cannot map `%s'", dbname);
2247 if ((mm = CAST(void *, malloc((size_t)st.st_size))) == NULL) {
2248 file_oomem(ms, (size_t)st.st_size);
2251 if (read(fd, mm, (size_t)st.st_size) != (ssize_t)st.st_size) {
2257 *magicp = CAST(struct magic *, mm);
2260 ptr = (uint32_t *)(void *)*magicp;
2261 if (*ptr != MAGICNO) {
2262 if (swap4(*ptr) != MAGICNO) {
2263 file_error(ms, 0, "bad magic in `%s'", dbname);
2270 version = swap4(ptr[1]);
2273 if (version != VERSIONNO) {
2274 file_error(ms, 0, "File %s supports only version %d magic "
2275 "files. `%s' is version %d", VERSION,
2276 VERSIONNO, dbname, version);
2279 *nmagicp = (uint32_t)(st.st_size / sizeof(struct magic));
2284 byteswap(*magicp, *nmagicp);
2293 (void)munmap((void *)mm, (size_t)st.st_size);
2305 #endif /* COMPILE_ONLY */
2307 private const uint32_t ar[] = {
2311 * handle an mmaped file.
2314 apprentice_compile(struct magic_set *ms, struct magic **magicp,
2315 uint32_t *nmagicp, const char *fn)
2321 dbname = mkdbname(ms, fn, 1);
2326 if ((fd = open(dbname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644)) == -1) {
2327 file_error(ms, errno, "cannot open `%s'", dbname);
2331 if (write(fd, ar, sizeof(ar)) != (ssize_t)sizeof(ar)) {
2332 file_error(ms, errno, "error writing `%s'", dbname);
2336 if (lseek(fd, (off_t)sizeof(struct magic), SEEK_SET)
2337 != sizeof(struct magic)) {
2338 file_error(ms, errno, "error seeking `%s'", dbname);
2342 if (write(fd, *magicp, (sizeof(struct magic) * *nmagicp))
2343 != (ssize_t)(sizeof(struct magic) * *nmagicp)) {
2344 file_error(ms, errno, "error writing `%s'", dbname);
2356 private const char ext[] = ".mgc";
2361 mkdbname(struct magic_set *ms, const char *fn, int strip)
2367 if ((p = strrchr(fn, '/')) != NULL)
2371 for (q = fn; *q; q++)
2374 for (p = ext + sizeof(ext) - 1; p >= ext && q >= fn; p--, q--)
2378 /* Did not find .mgc, restore q */
2384 /* Compatibility with old code that looked in .mime */
2385 if (ms->flags & MAGIC_MIME) {
2386 asprintf(&buf, "%.*s.mime%s", (int)(q - fn), fn, ext);
2387 if (access(buf, R_OK) != -1) {
2388 ms->flags &= MAGIC_MIME_TYPE;
2393 asprintf(&buf, "%.*s%s", (int)(q - fn), fn, ext);
2395 /* Compatibility with old code that looked in .mime */
2396 if (strstr(p, ".mime") != NULL)
2397 ms->flags &= MAGIC_MIME_TYPE;
2401 #ifndef COMPILE_ONLY
2403 * Byteswap an mmap'ed file if needed
2406 byteswap(struct magic *magic, uint32_t nmagic)
2409 for (i = 0; i < nmagic; i++)
2420 uint8_t *s = (uint8_t *)(void *)&sv;
2421 uint8_t *d = (uint8_t *)(void *)&rv;
2434 uint8_t *s = (uint8_t *)(void *)&sv;
2435 uint8_t *d = (uint8_t *)(void *)&rv;
2450 uint8_t *s = (uint8_t *)(void *)&sv;
2451 uint8_t *d = (uint8_t *)(void *)&rv;
2475 * byteswap a single magic entry
2478 bs1(struct magic *m)
2480 m->cont_level = swap2(m->cont_level);
2481 m->offset = swap4((uint32_t)m->offset);
2482 m->in_offset = swap4((uint32_t)m->in_offset);
2483 m->lineno = swap4((uint32_t)m->lineno);
2484 if (IS_STRING(m->type)) {
2485 m->str_range = swap4(m->str_range);
2486 m->str_flags = swap4(m->str_flags);
2489 m->value.q = swap8(m->value.q);
2490 m->num_mask = swap8(m->num_mask);
2493 #endif /* COMPILE_ONLY */
2496 file_pstring_length_size(const struct magic *m)
2498 switch (m->str_flags & PSTRING_LEN) {
2508 abort(); /* Impossible */
2513 file_pstring_get_length(const struct magic *m, const char *s)
2517 switch (m->str_flags & PSTRING_LEN) {
2522 len = (s[1] << 8) | s[0];
2525 len = (s[0] << 8) | s[1];
2528 len = (s[3] << 24) | (s[2] << 16) | (s[1] << 8) | s[0];
2531 len = (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3];
2534 abort(); /* Impossible */
2537 if (m->str_flags & PSTRING_LENGTH_INCLUDES_ITSELF)
2538 len -= file_pstring_length_size(m);