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;
652 /* Check for override */
653 if (mstart->str_flags & STRING_BINTEST)
654 mstart->flag |= BINTEST;
655 if (mstart->str_flags & STRING_TEXTTEST)
656 mstart->flag |= TEXTTEST;
658 if (mstart->flag & (TEXTTEST|BINTEST))
661 /* binary test if pattern is not text */
662 if (file_looks_utf8(m->value.us, (size_t)m->vallen, NULL,
664 mstart->flag |= BINTEST;
666 mstart->flag |= TEXTTEST;
670 /* can't deduce anything; we shouldn't see this at the
675 /* invalid search type, but no need to complain here */
681 * Load and parse one file.
684 load_1(struct magic_set *ms, int action, const char *fn, int *errs,
685 struct magic_entry **marray, uint32_t *marraycount)
687 size_t lineno = 0, llen = 0;
691 FILE *f = fopen(ms->file = fn, "r");
694 file_error(ms, errno, "cannot read magic file `%s'",
700 /* read and parse this file */
701 for (ms->line = 1; (len = getline(&line, &llen, f)) != -1;
703 if (len == 0) /* null line, garbage, etc */
705 if (line[len - 1] == '\n') {
707 line[len - 1] = '\0'; /* delete newline */
710 case '\0': /* empty, do not parse */
711 case '#': /* comment, do not parse */
714 if (line[1] == ':') {
717 for (i = 0; bang[i].name != NULL; i++) {
718 if ((size_t)(len - 2) > bang[i].len &&
719 memcmp(bang[i].name, line + 2,
723 if (bang[i].name == NULL) {
725 "Unknown !: entry `%s'", line);
729 if (*marraycount == 0) {
731 "No current entry for :!%s type",
736 if ((*bang[i].fun)(ms,
737 &(*marray)[*marraycount - 1],
738 line + bang[i].len + 2) != 0) {
746 if (parse(ms, marray, marraycount, line, lineno,
757 * parse a file or directory of files
758 * const char *fn: name of magic file or directory
761 cmpstrp(const void *p1, const void *p2)
763 return strcmp(*(char *const *)p1, *(char *const *)p2);
767 apprentice_load(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp,
768 const char *fn, int action)
771 struct magic_entry *marray;
772 uint32_t marraycount, i, mentrycount = 0, starttest;
773 size_t slen, files = 0, maxfiles = 0;
774 char **filearr = NULL, *mfn;
779 ms->flags |= MAGIC_CHECK; /* Enable checks for parsed files */
782 if ((marray = CAST(struct magic_entry *, calloc(maxmagic,
783 sizeof(*marray)))) == NULL) {
784 file_oomem(ms, maxmagic * sizeof(*marray));
789 /* print silly verbose header for USG compat. */
790 if (action == FILE_CHECK)
791 (void)fprintf(stderr, "%s\n", usg_hdr);
793 /* load directory or file */
794 if (stat(fn, &st) == 0 && S_ISDIR(st.st_mode)) {
800 while ((d = readdir(dir)) != NULL) {
801 if (asprintf(&mfn, "%s/%s", fn, d->d_name) < 0) {
803 strlen(fn) + strlen(d->d_name) + 2);
808 if (stat(mfn, &st) == -1 || !S_ISREG(st.st_mode)) {
812 if (files >= maxfiles) {
814 maxfiles = (maxfiles + 1) * 2;
815 mlen = maxfiles * sizeof(*filearr);
816 if ((filearr = CAST(char **,
817 realloc(filearr, mlen))) == NULL) {
818 file_oomem(ms, mlen);
825 filearr[files++] = mfn;
828 qsort(filearr, files, sizeof(*filearr), cmpstrp);
829 for (i = 0; i < files; i++) {
830 load_1(ms, action, filearr[i], &errs, &marray,
836 load_1(ms, action, fn, &errs, &marray, &marraycount);
840 /* Set types of tests */
841 for (i = 0; i < marraycount; ) {
842 if (marray[i].mp->cont_level != 0) {
849 static const char text[] = "text";
850 static const char binary[] = "binary";
851 static const size_t len = sizeof(text);
852 set_test_type(marray[starttest].mp, marray[i].mp);
853 if ((ms->flags & MAGIC_DEBUG) == 0)
855 (void)fprintf(stderr, "%s%s%s: %s\n",
856 marray[i].mp->mimetype,
857 marray[i].mp->mimetype[0] == '\0' ? "" : "; ",
858 marray[i].mp->desc[0] ? marray[i].mp->desc :
860 marray[i].mp->flag & BINTEST ? binary : text);
861 if (marray[i].mp->flag & BINTEST) {
862 char *p = strstr(marray[i].mp->desc, text);
863 if (p && (p == marray[i].mp->desc ||
864 isspace((unsigned char)p[-1])) &&
865 (p + len - marray[i].mp->desc ==
866 MAXstring || (p[len] == '\0' ||
867 isspace((unsigned char)p[len]))))
868 (void)fprintf(stderr, "*** Possible "
869 "binary test for text type\n");
871 } while (++i < marraycount && marray[i].mp->cont_level != 0);
874 qsort(marray, marraycount, sizeof(*marray), apprentice_sort);
877 * Make sure that any level 0 "default" line is last (if one exists).
879 for (i = 0; i < marraycount; i++) {
880 if (marray[i].mp->cont_level == 0 &&
881 marray[i].mp->type == FILE_DEFAULT) {
882 while (++i < marraycount)
883 if (marray[i].mp->cont_level == 0)
885 if (i != marraycount) {
887 ms->line = marray[i].mp->lineno;
889 "level 0 \"default\" did not sort last");
895 for (i = 0; i < marraycount; i++)
896 mentrycount += marray[i].cont_count;
898 slen = sizeof(**magicp) * mentrycount;
899 if ((*magicp = CAST(struct magic *, malloc(slen))) == NULL) {
900 file_oomem(ms, slen);
906 for (i = 0; i < marraycount; i++) {
907 (void)memcpy(*magicp + mentrycount, marray[i].mp,
908 marray[i].cont_count * sizeof(**magicp));
909 mentrycount += marray[i].cont_count;
912 for (i = 0; i < marraycount; i++)
920 *nmagicp = mentrycount;
927 * extend the sign bit if the comparison is to be signed
930 file_signextend(struct magic_set *ms, struct magic *m, uint64_t v)
932 if (!(m->flag & UNSIGNED)) {
935 * Do not remove the casts below. They are
936 * vital. When later compared with the data,
937 * the sign extension must have happened.
980 case FILE_BESTRING16:
981 case FILE_LESTRING16:
988 if (ms->flags & MAGIC_CHECK)
989 file_magwarn(ms, "cannot happen: m->type=%d\n",
998 string_modifier_check(struct magic_set *ms, struct magic *m)
1000 if ((ms->flags & MAGIC_CHECK) == 0)
1003 if (m->type != FILE_PSTRING && (m->str_flags & PSTRING_LEN) != 0) {
1005 "'/BHhLl' modifiers are only allowed for pascal strings\n");
1009 case FILE_BESTRING16:
1010 case FILE_LESTRING16:
1011 if (m->str_flags != 0) {
1013 "no modifiers allowed for 16-bit strings\n");
1019 if ((m->str_flags & REGEX_OFFSET_START) != 0) {
1021 "'/%c' only allowed on regex and search\n",
1022 CHAR_REGEX_OFFSET_START);
1027 if (m->str_range == 0) {
1029 "missing range; defaulting to %d\n",
1030 STRING_DEFAULT_RANGE);
1031 m->str_range = STRING_DEFAULT_RANGE;
1036 if ((m->str_flags & STRING_COMPACT_WHITESPACE) != 0) {
1037 file_magwarn(ms, "'/%c' not allowed on regex\n",
1038 CHAR_COMPACT_WHITESPACE);
1041 if ((m->str_flags & STRING_COMPACT_OPTIONAL_WHITESPACE) != 0) {
1042 file_magwarn(ms, "'/%c' not allowed on regex\n",
1043 CHAR_COMPACT_OPTIONAL_WHITESPACE);
1048 file_magwarn(ms, "coding error: m->type=%d\n",
1068 return FILE_OPMINUS;
1070 return FILE_OPMULTIPLY;
1072 return FILE_OPDIVIDE;
1074 return FILE_OPMODULO;
1080 #ifdef ENABLE_CONDITIONALS
1082 get_cond(const char *l, const char **t)
1084 static const struct cond_tbl_s {
1089 { "if", 2, COND_IF },
1090 { "elif", 4, COND_ELIF },
1091 { "else", 4, COND_ELSE },
1092 { "", 0, COND_NONE },
1094 const struct cond_tbl_s *p;
1096 for (p = cond_tbl; p->len; p++) {
1097 if (strncmp(l, p->name, p->len) == 0 &&
1098 isspace((unsigned char)l[p->len])) {
1108 check_cond(struct magic_set *ms, int cond, uint32_t cont_level)
1111 last_cond = ms->c.li[cont_level].last_cond;
1115 if (last_cond != COND_NONE && last_cond != COND_ELIF) {
1116 if (ms->flags & MAGIC_CHECK)
1117 file_magwarn(ms, "syntax error: `if'");
1120 last_cond = COND_IF;
1124 if (last_cond != COND_IF && last_cond != COND_ELIF) {
1125 if (ms->flags & MAGIC_CHECK)
1126 file_magwarn(ms, "syntax error: `elif'");
1129 last_cond = COND_ELIF;
1133 if (last_cond != COND_IF && last_cond != COND_ELIF) {
1134 if (ms->flags & MAGIC_CHECK)
1135 file_magwarn(ms, "syntax error: `else'");
1138 last_cond = COND_NONE;
1142 last_cond = COND_NONE;
1146 ms->c.li[cont_level].last_cond = last_cond;
1149 #endif /* ENABLE_CONDITIONALS */
1152 * parse one line from magic file, put into magic[index++] if valid
1155 parse(struct magic_set *ms, struct magic_entry **mentryp, uint32_t *nmentryp,
1156 const char *line, size_t lineno, int action)
1158 #ifdef ENABLE_CONDITIONALS
1159 static uint32_t last_cont_level = 0;
1162 struct magic_entry *me;
1164 const char *l = line;
1167 uint32_t cont_level;
1172 ++l; /* step over */
1175 #ifdef ENABLE_CONDITIONALS
1176 if (cont_level == 0 || cont_level > last_cont_level)
1177 if (file_check_mem(ms, cont_level) == -1)
1179 last_cont_level = cont_level;
1182 #define ALLOC_CHUNK (size_t)10
1183 #define ALLOC_INCR (size_t)200
1185 if (cont_level != 0) {
1186 if (*nmentryp == 0) {
1187 file_error(ms, 0, "No current entry for continuation");
1190 me = &(*mentryp)[*nmentryp - 1];
1191 if (me->cont_count == me->max_count) {
1193 size_t cnt = me->max_count + ALLOC_CHUNK;
1194 if ((nm = CAST(struct magic *, realloc(me->mp,
1195 sizeof(*nm) * cnt))) == NULL) {
1196 file_oomem(ms, sizeof(*nm) * cnt);
1200 me->max_count = CAST(uint32_t, cnt);
1202 m = &me->mp[me->cont_count++];
1203 (void)memset(m, 0, sizeof(*m));
1204 m->cont_level = cont_level;
1206 if (*nmentryp == maxmagic) {
1207 struct magic_entry *mp;
1209 maxmagic += ALLOC_INCR;
1210 if ((mp = CAST(struct magic_entry *,
1211 realloc(*mentryp, sizeof(*mp) * maxmagic))) ==
1213 file_oomem(ms, sizeof(*mp) * maxmagic);
1216 (void)memset(&mp[*nmentryp], 0, sizeof(*mp) *
1220 me = &(*mentryp)[*nmentryp];
1221 if (me->mp == NULL) {
1222 size_t len = sizeof(*m) * ALLOC_CHUNK;
1223 if ((m = CAST(struct magic *, malloc(len))) == NULL) {
1224 file_oomem(ms, len);
1228 me->max_count = ALLOC_CHUNK;
1231 (void)memset(m, 0, sizeof(*m));
1232 m->factor_op = FILE_FACTOR_OP_NONE;
1236 m->lineno = CAST(uint32_t, lineno);
1238 if (*l == '&') { /* m->cont_level == 0 checked below. */
1239 ++l; /* step over */
1243 ++l; /* step over */
1245 if (m->flag & OFFADD)
1246 m->flag = (m->flag & ~OFFADD) | INDIROFFADD;
1248 if (*l == '&') { /* m->cont_level == 0 checked below */
1249 ++l; /* step over */
1253 /* Indirect offsets are not valid at level 0. */
1254 if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD)))
1255 if (ms->flags & MAGIC_CHECK)
1256 file_magwarn(ms, "relative offset at level 0");
1258 /* get offset, then skip over it */
1259 m->offset = (uint32_t)strtoul(l, &t, 0);
1261 if (ms->flags & MAGIC_CHECK)
1262 file_magwarn(ms, "offset `%s' invalid", l);
1265 if (m->flag & INDIR) {
1266 m->in_type = FILE_LONG;
1269 * read [.lbs][+-]nnnnn)
1275 m->in_type = FILE_LELONG;
1278 m->in_type = FILE_BELONG;
1281 m->in_type = FILE_MELONG;
1285 m->in_type = FILE_LESHORT;
1289 m->in_type = FILE_BESHORT;
1295 m->in_type = FILE_BYTE;
1300 m->in_type = FILE_LEDOUBLE;
1305 m->in_type = FILE_BEDOUBLE;
1308 m->in_type = FILE_LEID3;
1311 m->in_type = FILE_BEID3;
1314 if (ms->flags & MAGIC_CHECK)
1316 "indirect offset type `%c' invalid",
1325 m->in_op |= FILE_OPINVERSE;
1328 if ((op = get_op(*l)) != -1) {
1333 m->in_op |= FILE_OPINDIRECT;
1336 if (isdigit((unsigned char)*l) || *l == '-') {
1337 m->in_offset = (int32_t)strtol(l, &t, 0);
1339 if (ms->flags & MAGIC_CHECK)
1341 "in_offset `%s' invalid", l);
1345 ((m->in_op & FILE_OPINDIRECT) && *l++ != ')'))
1346 if (ms->flags & MAGIC_CHECK)
1348 "missing ')' in indirect offset");
1352 #ifdef ENABLE_CONDITIONALS
1353 m->cond = get_cond(l, &l);
1354 if (check_cond(ms, m->cond, cont_level) == -1)
1362 m->flag |= UNSIGNED;
1365 m->type = get_type(l, &l);
1366 if (m->type == FILE_INVALID) {
1367 if (ms->flags & MAGIC_CHECK)
1368 file_magwarn(ms, "type `%s' invalid", l);
1372 /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
1373 /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */
1377 if (!IS_STRING(m->type))
1378 m->mask_op |= FILE_OPINVERSE;
1379 else if (ms->flags & MAGIC_CHECK)
1380 file_magwarn(ms, "'~' invalid for string types");
1384 m->str_flags = m->type == FILE_PSTRING ? PSTRING_1_LE : 0;
1385 if ((op = get_op(*l)) != -1) {
1386 if (!IS_STRING(m->type)) {
1390 val = (uint64_t)strtoull(l, &t, 0);
1392 m->num_mask = file_signextend(ms, m, val);
1395 else if (op == FILE_OPDIVIDE) {
1397 while (!isspace((unsigned char)*++l)) {
1399 case '0': case '1': case '2':
1400 case '3': case '4': case '5':
1401 case '6': case '7': case '8':
1404 (ms->flags & MAGIC_CHECK))
1408 m->str_range = CAST(uint32_t,
1410 if (m->str_range == 0)
1415 case CHAR_COMPACT_WHITESPACE:
1417 STRING_COMPACT_WHITESPACE;
1419 case CHAR_COMPACT_OPTIONAL_WHITESPACE:
1421 STRING_COMPACT_OPTIONAL_WHITESPACE;
1423 case CHAR_IGNORE_LOWERCASE:
1424 m->str_flags |= STRING_IGNORE_LOWERCASE;
1426 case CHAR_IGNORE_UPPERCASE:
1427 m->str_flags |= STRING_IGNORE_UPPERCASE;
1429 case CHAR_REGEX_OFFSET_START:
1430 m->str_flags |= REGEX_OFFSET_START;
1433 m->str_flags |= STRING_BINTEST;
1436 m->str_flags |= STRING_TEXTTEST;
1438 case CHAR_PSTRING_1_LE:
1439 if (m->type != FILE_PSTRING)
1441 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_1_LE;
1443 case CHAR_PSTRING_2_BE:
1444 if (m->type != FILE_PSTRING)
1446 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_BE;
1448 case CHAR_PSTRING_2_LE:
1449 if (m->type != FILE_PSTRING)
1451 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_LE;
1453 case CHAR_PSTRING_4_BE:
1454 if (m->type != FILE_PSTRING)
1456 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_BE;
1458 case CHAR_PSTRING_4_LE:
1459 if (m->type != FILE_PSTRING)
1461 m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_LE;
1463 case CHAR_PSTRING_LENGTH_INCLUDES_ITSELF:
1464 if (m->type != FILE_PSTRING)
1466 m->str_flags |= PSTRING_LENGTH_INCLUDES_ITSELF;
1470 if (ms->flags & MAGIC_CHECK)
1472 "string extension `%c' "
1476 /* allow multiple '/' for readability */
1478 !isspace((unsigned char)l[2]))
1481 if (string_modifier_check(ms, m) == -1)
1485 if (ms->flags & MAGIC_CHECK)
1486 file_magwarn(ms, "invalid string op: %c", *t);
1491 * We used to set mask to all 1's here, instead let's just not do
1492 * anything if mask = 0 (unless you have a better idea)
1502 if (ms->flags & MAGIC_CHECK) {
1503 file_magwarn(ms, "%c= not supported",
1510 /* Old-style anding: "0 byte &0x80 dynamically linked" */
1517 /* HP compat: ignore &= etc. */
1526 m->reln = '='; /* the default relation */
1527 if (*l == 'x' && ((isascii((unsigned char)l[1]) &&
1528 isspace((unsigned char)l[1])) || !l[1])) {
1535 * Grab the value part, except for an 'x' reln.
1537 if (m->reln != 'x' && getvalue(ms, m, &l, action))
1541 * TODO finish this macro and start using it!
1542 * #define offsetcheck {if (offset > HOWMANY-1)
1543 * magwarn("offset too big"); }
1547 * Now get last part - the description
1553 } else if ((l[0] == '\\') && (l[1] == 'b')) {
1558 for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof(m->desc); )
1560 if (i == sizeof(m->desc)) {
1561 m->desc[sizeof(m->desc) - 1] = '\0';
1562 if (ms->flags & MAGIC_CHECK)
1563 file_magwarn(ms, "description `%s' truncated", m->desc);
1567 * We only do this check while compiling, or if any of the magic
1568 * files were not compiled.
1570 if (ms->flags & MAGIC_CHECK) {
1571 if (check_format(ms, m) == -1)
1574 #ifndef COMPILE_ONLY
1575 if (action == FILE_CHECK) {
1579 m->mimetype[0] = '\0'; /* initialise MIME type to none */
1580 if (m->cont_level == 0)
1581 ++(*nmentryp); /* make room for next */
1586 * parse a STRENGTH annotation line from magic file, put into magic[index - 1]
1590 parse_strength(struct magic_set *ms, struct magic_entry *me, const char *line)
1592 const char *l = line;
1594 unsigned long factor;
1595 struct magic *m = &me->mp[0];
1597 if (m->factor_op != FILE_FACTOR_OP_NONE) {
1599 "Current entry already has a strength type: %c %d",
1600 m->factor_op, m->factor);
1605 case FILE_FACTOR_OP_NONE:
1606 case FILE_FACTOR_OP_PLUS:
1607 case FILE_FACTOR_OP_MINUS:
1608 case FILE_FACTOR_OP_TIMES:
1609 case FILE_FACTOR_OP_DIV:
1610 m->factor_op = *l++;
1613 file_magwarn(ms, "Unknown factor op `%c'", *l);
1617 factor = strtoul(l, &el, 0);
1619 file_magwarn(ms, "Too large factor `%lu'", factor);
1622 if (*el && !isspace((unsigned char)*el)) {
1623 file_magwarn(ms, "Bad factor `%s'", l);
1626 m->factor = (uint8_t)factor;
1627 if (m->factor == 0 && m->factor_op == FILE_FACTOR_OP_DIV) {
1628 file_magwarn(ms, "Cannot have factor op `%c' and factor %u",
1629 m->factor_op, m->factor);
1634 m->factor_op = FILE_FACTOR_OP_NONE;
1640 * Parse an Apple CREATOR/TYPE annotation from magic file and put it into
1644 parse_apple(struct magic_set *ms, struct magic_entry *me, const char *line)
1647 const char *l = line;
1648 struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
1650 if (m->apple[0] != '\0') {
1651 file_magwarn(ms, "Current entry already has a APPLE type "
1652 "`%.8s', new type `%s'", m->mimetype, l);
1657 for (i = 0; *l && ((isascii((unsigned char)*l) &&
1658 isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
1659 i < sizeof(m->apple); m->apple[i++] = *l++)
1661 if (i == sizeof(m->apple) && *l) {
1662 /* We don't need to NUL terminate here, printing handles it */
1663 if (ms->flags & MAGIC_CHECK)
1664 file_magwarn(ms, "APPLE type `%s' truncated %"
1665 SIZE_T_FORMAT "u", line, i);
1675 * parse a MIME annotation line from magic file, put into magic[index - 1]
1679 parse_mime(struct magic_set *ms, struct magic_entry *me, const char *line)
1682 const char *l = line;
1683 struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
1685 if (m->mimetype[0] != '\0') {
1686 file_magwarn(ms, "Current entry already has a MIME type `%s',"
1687 " new type `%s'", m->mimetype, l);
1692 for (i = 0; *l && ((isascii((unsigned char)*l) &&
1693 isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
1694 i < sizeof(m->mimetype); m->mimetype[i++] = *l++)
1696 if (i == sizeof(m->mimetype)) {
1697 m->mimetype[sizeof(m->mimetype) - 1] = '\0';
1698 if (ms->flags & MAGIC_CHECK)
1699 file_magwarn(ms, "MIME type `%s' truncated %"
1700 SIZE_T_FORMAT "u", m->mimetype, i);
1702 m->mimetype[i] = '\0';
1711 check_format_type(const char *ptr, int type)
1715 /* Missing format string; bad */
1728 while (isdigit((unsigned char)*ptr)) ptr++;
1731 while (isdigit((unsigned char)*ptr)) ptr++;
1783 case FILE_FMT_FLOAT:
1784 case FILE_FMT_DOUBLE:
1789 while (isdigit((unsigned char)*ptr)) ptr++;
1792 while (isdigit((unsigned char)*ptr)) ptr++;
1811 while (isdigit((unsigned char )*ptr))
1815 while (isdigit((unsigned char )*ptr))
1827 /* internal error */
1835 * Check that the optional printf format in description matches
1836 * the type of the magic.
1839 check_format(struct magic_set *ms, struct magic *m)
1843 for (ptr = m->desc; *ptr; ptr++)
1847 /* No format string; ok */
1851 assert(file_nformats == file_nnames);
1853 if (m->type >= file_nformats) {
1854 file_magwarn(ms, "Internal error inconsistency between "
1855 "m->type and format strings");
1858 if (file_formats[m->type] == FILE_FMT_NONE) {
1859 file_magwarn(ms, "No format string for `%s' with description "
1860 "`%s'", m->desc, file_names[m->type]);
1865 if (check_format_type(ptr, file_formats[m->type]) == -1) {
1867 * TODO: this error message is unhelpful if the format
1868 * string is not one character long
1870 file_magwarn(ms, "Printf format `%c' is not valid for type "
1871 "`%s' in description `%s'", *ptr ? *ptr : '?',
1872 file_names[m->type], m->desc);
1876 for (; *ptr; ptr++) {
1879 "Too many format strings (should have at most one) "
1880 "for `%s' with description `%s'",
1881 file_names[m->type], m->desc);
1889 * Read a numeric value from a pointer, into the value union of a magic
1890 * pointer, according to the magic type. Update the string pointer to point
1891 * just after the number read. Return 0 for success, non-zero for failure.
1894 getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
1897 case FILE_BESTRING16:
1898 case FILE_LESTRING16:
1903 *p = getstr(ms, m, *p, action == FILE_COMPILE);
1905 if (ms->flags & MAGIC_CHECK)
1906 file_magwarn(ms, "cannot get string from `%s'",
1914 if (m->reln != 'x') {
1917 m->value.f = strtof(*p, &ep);
1919 m->value.f = (float)strtod(*p, &ep);
1927 if (m->reln != 'x') {
1929 m->value.d = strtod(*p, &ep);
1934 if (m->reln != 'x') {
1936 m->value.q = file_signextend(ms, m,
1937 (uint64_t)strtoull(*p, &ep, 0));
1946 * Convert a string containing C character escapes. Stop at an unescaped
1948 * Copy the converted version to "m->value.s", and the length in m->vallen.
1949 * Return updated scan pointer as function result. Warn if set.
1951 private const char *
1952 getstr(struct magic_set *ms, struct magic *m, const char *s, int warn)
1954 const char *origs = s;
1955 char *p = m->value.s;
1956 size_t plen = sizeof(m->value.s);
1958 char *pmax = p + plen - 1;
1962 while ((c = *s++) != '\0') {
1963 if (isspace((unsigned char) c))
1966 file_error(ms, 0, "string too long: `%s'", origs);
1974 file_magwarn(ms, "incomplete escape");
1980 "escaped tab found, use \\t instead");
1981 warn = 0; /* already did */
1986 if (isprint((unsigned char)c)) {
1987 /* Allow escaping of
1989 if (strchr("<>&^=!", c) == NULL
1990 && (m->type != FILE_REGEX ||
1991 strchr("[]().*?^$|{}", c)
1993 file_magwarn(ms, "no "
1999 "unknown escape sequence: "
2004 /* space, perhaps force people to use \040? */
2008 * Other things people escape, but shouldn't need to,
2009 * so we disallow them
2022 /* and baskslash itself */
2055 /* \ and up to 3 octal digits */
2065 c = *s++; /* try for 2 */
2066 if (c >= '0' && c <= '7') {
2067 val = (val << 3) | (c - '0');
2068 c = *s++; /* try for 3 */
2069 if (c >= '0' && c <= '7')
2070 val = (val << 3) | (c-'0');
2079 /* \x and up to 2 hex digits */
2081 val = 'x'; /* Default if no digits */
2082 c = hextoint(*s++); /* Get next char */
2087 val = (val << 4) + c;
2100 m->vallen = CAST(unsigned char, (p - origp));
2101 if (m->type == FILE_PSTRING)
2102 m->vallen += (unsigned char)file_pstring_length_size(m);
2107 /* Single hex char to int; -1 if not a hex char. */
2111 if (!isascii((unsigned char) c))
2113 if (isdigit((unsigned char) c))
2115 if ((c >= 'a') && (c <= 'f'))
2116 return c + 10 - 'a';
2117 if (( c>= 'A') && (c <= 'F'))
2118 return c + 10 - 'A';
2124 * Print a string containing C character escapes.
2127 file_showstr(FILE *fp, const char *s, size_t len)
2142 if (c >= 040 && c <= 0176) /* TODO isprint && !iscntrl */
2143 (void) fputc(c, fp);
2145 (void) fputc('\\', fp);
2148 (void) fputc('a', fp);
2152 (void) fputc('b', fp);
2156 (void) fputc('f', fp);
2160 (void) fputc('n', fp);
2164 (void) fputc('r', fp);
2168 (void) fputc('t', fp);
2172 (void) fputc('v', fp);
2176 (void) fprintf(fp, "%.3o", c & 0377);
2184 * eatsize(): Eat the size spec from a number [eg. 10UL]
2187 eatsize(const char **p)
2191 if (LOWCASE(*l) == 'u')
2194 switch (LOWCASE(*l)) {
2195 case 'l': /* long */
2196 case 's': /* short */
2197 case 'h': /* short */
2198 case 'b': /* char/byte */
2199 case 'c': /* char/byte */
2209 #ifndef COMPILE_ONLY
2211 * handle a compiled file.
2214 apprentice_map(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp,
2222 char *dbname = NULL;
2225 dbname = mkdbname(ms, fn, 0);
2229 if ((fd = open(dbname, O_RDONLY|O_BINARY)) == -1)
2232 if (fstat(fd, &st) == -1) {
2233 file_error(ms, errno, "cannot stat `%s'", dbname);
2236 if (st.st_size < 8) {
2237 file_error(ms, 0, "file `%s' is too small", dbname);
2242 if ((mm = mmap(0, (size_t)st.st_size, PROT_READ|PROT_WRITE,
2243 MAP_PRIVATE|MAP_FILE, fd, (off_t)0)) == MAP_FAILED) {
2244 file_error(ms, errno, "cannot map `%s'", dbname);
2249 if ((mm = CAST(void *, malloc((size_t)st.st_size))) == NULL) {
2250 file_oomem(ms, (size_t)st.st_size);
2253 if (read(fd, mm, (size_t)st.st_size) != (ssize_t)st.st_size) {
2259 *magicp = CAST(struct magic *, mm);
2262 ptr = (uint32_t *)(void *)*magicp;
2263 if (*ptr != MAGICNO) {
2264 if (swap4(*ptr) != MAGICNO) {
2265 file_error(ms, 0, "bad magic in `%s'", dbname);
2272 version = swap4(ptr[1]);
2275 if (version != VERSIONNO) {
2276 file_error(ms, 0, "File %s supports only version %d magic "
2277 "files. `%s' is version %d", VERSION,
2278 VERSIONNO, dbname, version);
2281 *nmagicp = (uint32_t)(st.st_size / sizeof(struct magic));
2286 byteswap(*magicp, *nmagicp);
2295 (void)munmap((void *)mm, (size_t)st.st_size);
2307 #endif /* COMPILE_ONLY */
2309 private const uint32_t ar[] = {
2313 * handle an mmaped file.
2316 apprentice_compile(struct magic_set *ms, struct magic **magicp,
2317 uint32_t *nmagicp, const char *fn)
2323 dbname = mkdbname(ms, fn, 1);
2328 if ((fd = open(dbname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644)) == -1) {
2329 file_error(ms, errno, "cannot open `%s'", dbname);
2333 if (write(fd, ar, sizeof(ar)) != (ssize_t)sizeof(ar)) {
2334 file_error(ms, errno, "error writing `%s'", dbname);
2338 if (lseek(fd, (off_t)sizeof(struct magic), SEEK_SET)
2339 != sizeof(struct magic)) {
2340 file_error(ms, errno, "error seeking `%s'", dbname);
2344 if (write(fd, *magicp, (sizeof(struct magic) * *nmagicp))
2345 != (ssize_t)(sizeof(struct magic) * *nmagicp)) {
2346 file_error(ms, errno, "error writing `%s'", dbname);
2358 private const char ext[] = ".mgc";
2363 mkdbname(struct magic_set *ms, const char *fn, int strip)
2369 if ((p = strrchr(fn, '/')) != NULL)
2373 for (q = fn; *q; q++)
2376 for (p = ext + sizeof(ext) - 1; p >= ext && q >= fn; p--, q--)
2380 /* Did not find .mgc, restore q */
2386 /* Compatibility with old code that looked in .mime */
2387 if (ms->flags & MAGIC_MIME) {
2388 asprintf(&buf, "%.*s.mime%s", (int)(q - fn), fn, ext);
2389 if (access(buf, R_OK) != -1) {
2390 ms->flags &= MAGIC_MIME_TYPE;
2395 asprintf(&buf, "%.*s%s", (int)(q - fn), fn, ext);
2397 /* Compatibility with old code that looked in .mime */
2398 if (strstr(p, ".mime") != NULL)
2399 ms->flags &= MAGIC_MIME_TYPE;
2403 #ifndef COMPILE_ONLY
2405 * Byteswap an mmap'ed file if needed
2408 byteswap(struct magic *magic, uint32_t nmagic)
2411 for (i = 0; i < nmagic; i++)
2422 uint8_t *s = (uint8_t *)(void *)&sv;
2423 uint8_t *d = (uint8_t *)(void *)&rv;
2436 uint8_t *s = (uint8_t *)(void *)&sv;
2437 uint8_t *d = (uint8_t *)(void *)&rv;
2452 uint8_t *s = (uint8_t *)(void *)&sv;
2453 uint8_t *d = (uint8_t *)(void *)&rv;
2477 * byteswap a single magic entry
2480 bs1(struct magic *m)
2482 m->cont_level = swap2(m->cont_level);
2483 m->offset = swap4((uint32_t)m->offset);
2484 m->in_offset = swap4((uint32_t)m->in_offset);
2485 m->lineno = swap4((uint32_t)m->lineno);
2486 if (IS_STRING(m->type)) {
2487 m->str_range = swap4(m->str_range);
2488 m->str_flags = swap4(m->str_flags);
2491 m->value.q = swap8(m->value.q);
2492 m->num_mask = swap8(m->num_mask);
2495 #endif /* COMPILE_ONLY */
2498 file_pstring_length_size(const struct magic *m)
2500 switch (m->str_flags & PSTRING_LEN) {
2510 abort(); /* Impossible */
2515 file_pstring_get_length(const struct magic *m, const char *s)
2519 switch (m->str_flags & PSTRING_LEN) {
2524 len = (s[1] << 8) | s[0];
2527 len = (s[0] << 8) | s[1];
2530 len = (s[3] << 24) | (s[2] << 16) | (s[1] << 8) | s[0];
2533 len = (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3];
2536 abort(); /* Impossible */
2539 if (m->str_flags & PSTRING_LENGTH_INCLUDES_ITSELF)
2540 len -= file_pstring_length_size(m);