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+/*
+ * Copyright (c) Ian F. Darwin 1986-1995.
+ * Software written by Ian F. Darwin and others;
+ * maintained 1995-present by Christos Zoulas and others.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice immediately at the beginning of the file, without modification,
+ * this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*
+ * apprentice - make one pass through /etc/magic, learning its secrets.
+ */
+
+#include "file.h"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: apprentice.c,v 1.190 2013/02/17 22:29:40 christos Exp $")
+#endif /* lint */
+
+#include "magic.h"
+#include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <string.h>
+#include <assert.h>
+#include <ctype.h>
+#include <fcntl.h>
+#ifdef QUICK
+#include <sys/mman.h>
+#endif
+#include <dirent.h>
+
+#define EATAB {while (isascii((unsigned char) *l) && \
+ isspace((unsigned char) *l)) ++l;}
+#define LOWCASE(l) (isupper((unsigned char) (l)) ? \
+ tolower((unsigned char) (l)) : (l))
+/*
+ * Work around a bug in headers on Digital Unix.
+ * At least confirmed for: OSF1 V4.0 878
+ */
+#if defined(__osf__) && defined(__DECC)
+#ifdef MAP_FAILED
+#undef MAP_FAILED
+#endif
+#endif
+
+#ifndef MAP_FAILED
+#define MAP_FAILED (void *) -1
+#endif
+
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+#define ALLOC_CHUNK (size_t)10
+#define ALLOC_INCR (size_t)200
+
+struct magic_entry {
+ struct magic *mp;
+ uint32_t cont_count;
+ uint32_t max_count;
+};
+
+struct magic_map {
+ void *p;
+ size_t len;
+ struct magic *magic[MAGIC_SETS];
+ uint32_t nmagic[MAGIC_SETS];
+};
+
+int file_formats[FILE_NAMES_SIZE];
+const size_t file_nformats = FILE_NAMES_SIZE;
+const char *file_names[FILE_NAMES_SIZE];
+const size_t file_nnames = FILE_NAMES_SIZE;
+
+private int getvalue(struct magic_set *ms, struct magic *, const char **, int);
+private int hextoint(int);
+private const char *getstr(struct magic_set *, struct magic *, const char *,
+ int);
+private int parse(struct magic_set *, struct magic_entry *, const char *,
+ size_t, int);
+private void eatsize(const char **);
+private int apprentice_1(struct magic_set *, const char *, int);
+private size_t apprentice_magic_strength(const struct magic *);
+private int apprentice_sort(const void *, const void *);
+private void apprentice_list(struct mlist *, int );
+private struct magic_map *apprentice_load(struct magic_set *,
+ const char *, int);
+private struct mlist *mlist_alloc(void);
+private void mlist_free(struct mlist *);
+private void byteswap(struct magic *, uint32_t);
+private void bs1(struct magic *);
+private uint16_t swap2(uint16_t);
+private uint32_t swap4(uint32_t);
+private uint64_t swap8(uint64_t);
+private char *mkdbname(struct magic_set *, const char *, int);
+private struct magic_map *apprentice_map(struct magic_set *, const char *);
+private void apprentice_unmap(struct magic_map *);
+private int apprentice_compile(struct magic_set *, struct magic_map *,
+ const char *);
+private int check_format_type(const char *, int);
+private int check_format(struct magic_set *, struct magic *);
+private int get_op(char);
+private int parse_mime(struct magic_set *, struct magic_entry *, const char *);
+private int parse_strength(struct magic_set *, struct magic_entry *, const char *);
+private int parse_apple(struct magic_set *, struct magic_entry *, const char *);
+
+
+private size_t maxmagic[MAGIC_SETS] = { 0 };
+private size_t magicsize = sizeof(struct magic);
+
+private const char usg_hdr[] = "cont\toffset\ttype\topcode\tmask\tvalue\tdesc";
+
+private struct {
+ const char *name;
+ size_t len;
+ int (*fun)(struct magic_set *, struct magic_entry *, const char *);
+} bang[] = {
+#define DECLARE_FIELD(name) { # name, sizeof(# name) - 1, parse_ ## name }
+ DECLARE_FIELD(mime),
+ DECLARE_FIELD(apple),
+ DECLARE_FIELD(strength),
+#undef DECLARE_FIELD
+ { NULL, 0, NULL }
+};
+
+#ifdef COMPILE_ONLY
+
+int main(int, char *[]);
+
+int
+main(int argc, char *argv[])
+{
+ int ret;
+ struct magic_set *ms;
+ char *progname;
+
+ if ((progname = strrchr(argv[0], '/')) != NULL)
+ progname++;
+ else
+ progname = argv[0];
+
+ if (argc != 2) {
+ (void)fprintf(stderr, "Usage: %s file\n", progname);
+ return 1;
+ }
+
+ if ((ms = magic_open(MAGIC_CHECK)) == NULL) {
+ (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
+ return 1;
+ }
+ ret = magic_compile(ms, argv[1]) == -1 ? 1 : 0;
+ if (ret == 1)
+ (void)fprintf(stderr, "%s: %s\n", progname, magic_error(ms));
+ magic_close(ms);
+ return ret;
+}
+#endif /* COMPILE_ONLY */
+
+struct type_tbl_s {
+ const char name[16];
+ const size_t len;
+ const int type;
+ const int format;
+};
+
+/*
+ * XXX - the actual Single UNIX Specification says that "long" means "long",
+ * as in the C data type, but we treat it as meaning "4-byte integer".
+ * Given that the OS X version of file 5.04 did the same, I guess that passes
+ * the actual test; having "long" be dependent on how big a "long" is on
+ * the machine running "file" is silly.
+ */
+static const struct type_tbl_s type_tbl[] = {
+# define XX(s) s, (sizeof(s) - 1)
+# define XX_NULL "", 0
+ { XX("invalid"), FILE_INVALID, FILE_FMT_NONE },
+ { XX("byte"), FILE_BYTE, FILE_FMT_NUM },
+ { XX("short"), FILE_SHORT, FILE_FMT_NUM },
+ { XX("default"), FILE_DEFAULT, FILE_FMT_STR },
+ { XX("long"), FILE_LONG, FILE_FMT_NUM },
+ { XX("string"), FILE_STRING, FILE_FMT_STR },
+ { XX("date"), FILE_DATE, FILE_FMT_STR },
+ { XX("beshort"), FILE_BESHORT, FILE_FMT_NUM },
+ { XX("belong"), FILE_BELONG, FILE_FMT_NUM },
+ { XX("bedate"), FILE_BEDATE, FILE_FMT_STR },
+ { XX("leshort"), FILE_LESHORT, FILE_FMT_NUM },
+ { XX("lelong"), FILE_LELONG, FILE_FMT_NUM },
+ { XX("ledate"), FILE_LEDATE, FILE_FMT_STR },
+ { XX("pstring"), FILE_PSTRING, FILE_FMT_STR },
+ { XX("ldate"), FILE_LDATE, FILE_FMT_STR },
+ { XX("beldate"), FILE_BELDATE, FILE_FMT_STR },
+ { XX("leldate"), FILE_LELDATE, FILE_FMT_STR },
+ { XX("regex"), FILE_REGEX, FILE_FMT_STR },
+ { XX("bestring16"), FILE_BESTRING16, FILE_FMT_STR },
+ { XX("lestring16"), FILE_LESTRING16, FILE_FMT_STR },
+ { XX("search"), FILE_SEARCH, FILE_FMT_STR },
+ { XX("medate"), FILE_MEDATE, FILE_FMT_STR },
+ { XX("meldate"), FILE_MELDATE, FILE_FMT_STR },
+ { XX("melong"), FILE_MELONG, FILE_FMT_NUM },
+ { XX("quad"), FILE_QUAD, FILE_FMT_QUAD },
+ { XX("lequad"), FILE_LEQUAD, FILE_FMT_QUAD },
+ { XX("bequad"), FILE_BEQUAD, FILE_FMT_QUAD },
+ { XX("qdate"), FILE_QDATE, FILE_FMT_STR },
+ { XX("leqdate"), FILE_LEQDATE, FILE_FMT_STR },
+ { XX("beqdate"), FILE_BEQDATE, FILE_FMT_STR },
+ { XX("qldate"), FILE_QLDATE, FILE_FMT_STR },
+ { XX("leqldate"), FILE_LEQLDATE, FILE_FMT_STR },
+ { XX("beqldate"), FILE_BEQLDATE, FILE_FMT_STR },
+ { XX("float"), FILE_FLOAT, FILE_FMT_FLOAT },
+ { XX("befloat"), FILE_BEFLOAT, FILE_FMT_FLOAT },
+ { XX("lefloat"), FILE_LEFLOAT, FILE_FMT_FLOAT },
+ { XX("double"), FILE_DOUBLE, FILE_FMT_DOUBLE },
+ { XX("bedouble"), FILE_BEDOUBLE, FILE_FMT_DOUBLE },
+ { XX("ledouble"), FILE_LEDOUBLE, FILE_FMT_DOUBLE },
+ { XX("leid3"), FILE_LEID3, FILE_FMT_NUM },
+ { XX("beid3"), FILE_BEID3, FILE_FMT_NUM },
+ { XX("indirect"), FILE_INDIRECT, FILE_FMT_NUM },
+ { XX("qwdate"), FILE_QWDATE, FILE_FMT_STR },
+ { XX("leqwdate"), FILE_LEQWDATE, FILE_FMT_STR },
+ { XX("beqwdate"), FILE_BEQWDATE, FILE_FMT_STR },
+ { XX("name"), FILE_NAME, FILE_FMT_NONE },
+ { XX("use"), FILE_USE, FILE_FMT_NONE },
+ { XX_NULL, FILE_INVALID, FILE_FMT_NONE },
+};
+
+/*
+ * These are not types, and cannot be preceded by "u" to make them
+ * unsigned.
+ */
+static const struct type_tbl_s special_tbl[] = {
+ { XX("name"), FILE_NAME, FILE_FMT_STR },
+ { XX("use"), FILE_USE, FILE_FMT_STR },
+ { XX_NULL, FILE_INVALID, FILE_FMT_NONE },
+};
+# undef XX
+# undef XX_NULL
+
+private int
+get_type(const struct type_tbl_s *tbl, const char *l, const char **t)
+{
+ const struct type_tbl_s *p;
+
+ for (p = tbl; p->len; p++) {
+ if (strncmp(l, p->name, p->len) == 0) {
+ if (t)
+ *t = l + p->len;
+ break;
+ }
+ }
+ return p->type;
+}
+
+private int
+get_standard_integer_type(const char *l, const char **t)
+{
+ int type;
+
+ if (isalpha((unsigned char)l[1])) {
+ switch (l[1]) {
+ case 'C':
+ /* "dC" and "uC" */
+ type = FILE_BYTE;
+ break;
+ case 'S':
+ /* "dS" and "uS" */
+ type = FILE_SHORT;
+ break;
+ case 'I':
+ case 'L':
+ /*
+ * "dI", "dL", "uI", and "uL".
+ *
+ * XXX - the actual Single UNIX Specification says
+ * that "L" means "long", as in the C data type,
+ * but we treat it as meaning "4-byte integer".
+ * Given that the OS X version of file 5.04 did
+ * the same, I guess that passes the actual SUS
+ * validation suite; having "dL" be dependent on
+ * how big a "long" is on the machine running
+ * "file" is silly.
+ */
+ type = FILE_LONG;
+ break;
+ case 'Q':
+ /* "dQ" and "uQ" */
+ type = FILE_QUAD;
+ break;
+ default:
+ /* "d{anything else}", "u{anything else}" */
+ return FILE_INVALID;
+ }
+ l += 2;
+ } else if (isdigit((unsigned char)l[1])) {
+ /*
+ * "d{num}" and "u{num}"; we only support {num} values
+ * of 1, 2, 4, and 8 - the Single UNIX Specification
+ * doesn't say anything about whether arbitrary
+ * values should be supported, but both the Solaris 10
+ * and OS X Mountain Lion versions of file passed the
+ * Single UNIX Specification validation suite, and
+ * neither of them support values bigger than 8 or
+ * non-power-of-2 values.
+ */
+ if (isdigit((unsigned char)l[2])) {
+ /* Multi-digit, so > 9 */
+ return FILE_INVALID;
+ }
+ switch (l[1]) {
+ case '1':
+ type = FILE_BYTE;
+ break;
+ case '2':
+ type = FILE_SHORT;
+ break;
+ case '4':
+ type = FILE_LONG;
+ break;
+ case '8':
+ type = FILE_QUAD;
+ break;
+ default:
+ /* XXX - what about 3, 5, 6, or 7? */
+ return FILE_INVALID;
+ }
+ l += 2;
+ } else {
+ /*
+ * "d" or "u" by itself.
+ */
+ type = FILE_LONG;
+ ++l;
+ }
+ if (t)
+ *t = l;
+ return type;
+}
+
+private void
+init_file_tables(void)
+{
+ static int done = 0;
+ const struct type_tbl_s *p;
+
+ if (done)
+ return;
+ done++;
+
+ for (p = type_tbl; p->len; p++) {
+ assert(p->type < FILE_NAMES_SIZE);
+ file_names[p->type] = p->name;
+ file_formats[p->type] = p->format;
+ }
+ assert(p - type_tbl == FILE_NAMES_SIZE);
+}
+
+private int
+add_mlist(struct mlist *mlp, struct magic_map *map, size_t idx)
+{
+ struct mlist *ml;
+
+ if ((ml = CAST(struct mlist *, malloc(sizeof(*ml)))) == NULL)
+ return -1;
+
+ ml->map = idx == 0 ? map : NULL;
+ ml->magic = map->magic[idx];
+ ml->nmagic = map->nmagic[idx];
+
+ mlp->prev->next = ml;
+ ml->prev = mlp->prev;
+ ml->next = mlp;
+ mlp->prev = ml;
+ return 0;
+}
+
+/*
+ * Handle one file or directory.
+ */
+private int
+apprentice_1(struct magic_set *ms, const char *fn, int action)
+{
+ struct mlist *ml;
+ struct magic_map *map;
+ size_t i;
+
+ if (magicsize != FILE_MAGICSIZE) {
+ file_error(ms, 0, "magic element size %lu != %lu",
+ (unsigned long)sizeof(*map->magic[0]),
+ (unsigned long)FILE_MAGICSIZE);
+ return -1;
+ }
+
+ if (action == FILE_COMPILE) {
+ map = apprentice_load(ms, fn, action);
+ if (map == NULL)
+ return -1;
+ return apprentice_compile(ms, map, fn);
+ }
+
+#ifndef COMPILE_ONLY
+ map = apprentice_map(ms, fn);
+ if (map == NULL) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "using regular magic file `%s'", fn);
+ map = apprentice_load(ms, fn, action);
+ if (map == NULL)
+ return -1;
+ }
+
+ for (i = 0; i < MAGIC_SETS; i++) {
+ if (add_mlist(ms->mlist[i], map, i) == -1) {
+ file_oomem(ms, sizeof(*ml));
+ apprentice_unmap(map);
+ return -1;
+ }
+ }
+
+ if (action == FILE_LIST) {
+ for (i = 0; i < MAGIC_SETS; i++) {
+ printf("Set %zu:\nBinary patterns:\n", i);
+ apprentice_list(ms->mlist[i], BINTEST);
+ printf("Text patterns:\n");
+ apprentice_list(ms->mlist[i], TEXTTEST);
+ }
+ }
+
+ return 0;
+#endif /* COMPILE_ONLY */
+}
+
+protected void
+file_ms_free(struct magic_set *ms)
+{
+ size_t i;
+ if (ms == NULL)
+ return;
+ for (i = 0; i < MAGIC_SETS; i++)
+ mlist_free(ms->mlist[i]);
+ free(ms->o.pbuf);
+ free(ms->o.buf);
+ free(ms->c.li);
+ free(ms);
+}
+
+protected struct magic_set *
+file_ms_alloc(int flags)
+{
+ struct magic_set *ms;
+ size_t i, len;
+
+ if ((ms = CAST(struct magic_set *, calloc((size_t)1,
+ sizeof(struct magic_set)))) == NULL)
+ return NULL;
+
+ if (magic_setflags(ms, flags) == -1) {
+ errno = EINVAL;
+ goto free;
+ }
+
+ ms->o.buf = ms->o.pbuf = NULL;
+ len = (ms->c.len = 10) * sizeof(*ms->c.li);
+
+ if ((ms->c.li = CAST(struct level_info *, malloc(len))) == NULL)
+ goto free;
+
+ ms->event_flags = 0;
+ ms->error = -1;
+ for (i = 0; i < MAGIC_SETS; i++)
+ ms->mlist[i] = NULL;
+ ms->file = "unknown";
+ ms->line = 0;
+ return ms;
+free:
+ free(ms);
+ return NULL;
+}
+
+private void
+apprentice_unmap(struct magic_map *map)
+{
+ if (map == NULL)
+ return;
+ if (map->p == NULL)
+ return;
+#ifdef QUICK
+ if (map->len)
+ (void)munmap(map->p, map->len);
+ else
+#endif
+ free(map->p);
+ free(map);
+}
+
+private struct mlist *
+mlist_alloc(void)
+{
+ struct mlist *mlist;
+ if ((mlist = CAST(struct mlist *, calloc(1, sizeof(*mlist)))) == NULL) {
+ return NULL;
+ }
+ mlist->next = mlist->prev = mlist;
+ return mlist;
+}
+
+private void
+mlist_free(struct mlist *mlist)
+{
+ struct mlist *ml;
+
+ if (mlist == NULL)
+ return;
+
+ for (ml = mlist->next; ml != mlist;) {
+ struct mlist *next = ml->next;
+ if (ml->map)
+ apprentice_unmap(ml->map);
+ free(ml);
+ ml = next;
+ }
+ free(ml);
+}
+
+/* const char *fn: list of magic files and directories */
+protected int
+file_apprentice(struct magic_set *ms, const char *fn, int action)
+{
+ char *p, *mfn;
+ int file_err, errs = -1;
+ size_t i;
+
+ if ((fn = magic_getpath(fn, action)) == NULL)
+ return -1;
+
+ init_file_tables();
+
+ if ((mfn = strdup(fn)) == NULL) {
+ file_oomem(ms, strlen(fn));
+ return -1;
+ }
+
+ for (i = 0; i < MAGIC_SETS; i++) {
+ mlist_free(ms->mlist[i]);
+ if ((ms->mlist[i] = mlist_alloc()) == NULL) {
+ file_oomem(ms, sizeof(*ms->mlist[i]));
+ if (i != 0) {
+ --i;
+ do
+ mlist_free(ms->mlist[i]);
+ while (i != 0);
+ }
+ free(mfn);
+ return -1;
+ }
+ }
+ fn = mfn;
+
+ while (fn) {
+ p = strchr(fn, PATHSEP);
+ if (p)
+ *p++ = '\0';
+ if (*fn == '\0')
+ break;
+ file_err = apprentice_1(ms, fn, action);
+ errs = MAX(errs, file_err);
+ fn = p;
+ }
+
+ free(mfn);
+
+ if (errs == -1) {
+ for (i = 0; i < MAGIC_SETS; i++) {
+ mlist_free(ms->mlist[i]);
+ ms->mlist[i] = NULL;
+ }
+ file_error(ms, 0, "could not find any valid magic files!");
+ return -1;
+ }
+
+ if (action == FILE_LOAD)
+ return 0;
+
+ for (i = 0; i < MAGIC_SETS; i++) {
+ mlist_free(ms->mlist[i]);
+ ms->mlist[i] = NULL;
+ }
+
+ switch (action) {
+ case FILE_COMPILE:
+ case FILE_CHECK:
+ case FILE_LIST:
+ return 0;
+ default:
+ file_error(ms, 0, "Invalid action %d", action);
+ return -1;
+ }
+}
+
+/*
+ * Get weight of this magic entry, for sorting purposes.
+ */
+private size_t
+apprentice_magic_strength(const struct magic *m)
+{
+#define MULT 10
+ size_t val = 2 * MULT; /* baseline strength */
+
+ switch (m->type) {
+ case FILE_DEFAULT: /* make sure this sorts last */
+ if (m->factor_op != FILE_FACTOR_OP_NONE)
+ abort();
+ return 0;
+
+ case FILE_BYTE:
+ val += 1 * MULT;
+ break;
+
+ case FILE_SHORT:
+ case FILE_LESHORT:
+ case FILE_BESHORT:
+ val += 2 * MULT;
+ break;
+
+ case FILE_LONG:
+ case FILE_LELONG:
+ case FILE_BELONG:
+ case FILE_MELONG:
+ val += 4 * MULT;
+ break;
+
+ case FILE_PSTRING:
+ case FILE_STRING:
+ val += m->vallen * MULT;
+ break;
+
+ case FILE_BESTRING16:
+ case FILE_LESTRING16:
+ val += m->vallen * MULT / 2;
+ break;
+
+ case FILE_SEARCH:
+ case FILE_REGEX:
+ val += m->vallen * MAX(MULT / m->vallen, 1);
+ break;
+
+ case FILE_DATE:
+ case FILE_LEDATE:
+ case FILE_BEDATE:
+ case FILE_MEDATE:
+ case FILE_LDATE:
+ case FILE_LELDATE:
+ case FILE_BELDATE:
+ case FILE_MELDATE:
+ case FILE_FLOAT:
+ case FILE_BEFLOAT:
+ case FILE_LEFLOAT:
+ val += 4 * MULT;
+ break;
+
+ case FILE_QUAD:
+ case FILE_BEQUAD:
+ case FILE_LEQUAD:
+ case FILE_QDATE:
+ case FILE_LEQDATE:
+ case FILE_BEQDATE:
+ case FILE_QLDATE:
+ case FILE_LEQLDATE:
+ case FILE_BEQLDATE:
+ case FILE_QWDATE:
+ case FILE_LEQWDATE:
+ case FILE_BEQWDATE:
+ case FILE_DOUBLE:
+ case FILE_BEDOUBLE:
+ case FILE_LEDOUBLE:
+ val += 8 * MULT;
+ break;
+
+ case FILE_INDIRECT:
+ case FILE_NAME:
+ case FILE_USE:
+ break;
+
+ default:
+ val = 0;
+ (void)fprintf(stderr, "Bad type %d\n", m->type);
+ abort();
+ }
+
+ switch (m->reln) {
+ case 'x': /* matches anything penalize */
+ case '!': /* matches almost anything penalize */
+ val = 0;
+ break;
+
+ case '=': /* Exact match, prefer */
+ val += MULT;
+ break;
+
+ case '>':
+ case '<': /* comparison match reduce strength */
+ val -= 2 * MULT;
+ break;
+
+ case '^':
+ case '&': /* masking bits, we could count them too */
+ val -= MULT;
+ break;
+
+ default:
+ (void)fprintf(stderr, "Bad relation %c\n", m->reln);
+ abort();
+ }
+
+ if (val == 0) /* ensure we only return 0 for FILE_DEFAULT */
+ val = 1;
+
+ switch (m->factor_op) {
+ case FILE_FACTOR_OP_NONE:
+ break;
+ case FILE_FACTOR_OP_PLUS:
+ val += m->factor;
+ break;
+ case FILE_FACTOR_OP_MINUS:
+ val -= m->factor;
+ break;
+ case FILE_FACTOR_OP_TIMES:
+ val *= m->factor;
+ break;
+ case FILE_FACTOR_OP_DIV:
+ val /= m->factor;
+ break;
+ default:
+ abort();
+ }
+
+ /*
+ * Magic entries with no description get a bonus because they depend
+ * on subsequent magic entries to print something.
+ */
+ if (m->desc[0] == '\0')
+ val++;
+ return val;
+}
+
+/*
+ * Sort callback for sorting entries by "strength" (basically length)
+ */
+private int
+apprentice_sort(const void *a, const void *b)
+{
+ const struct magic_entry *ma = CAST(const struct magic_entry *, a);
+ const struct magic_entry *mb = CAST(const struct magic_entry *, b);
+ size_t sa = apprentice_magic_strength(ma->mp);
+ size_t sb = apprentice_magic_strength(mb->mp);
+ if (sa == sb)
+ return 0;
+ else if (sa > sb)
+ return -1;
+ else
+ return 1;
+}
+
+/*
+ * Shows sorted patterns list in the order which is used for the matching
+ */
+private void
+apprentice_list(struct mlist *mlist, int mode)
+{
+ uint32_t magindex = 0;
+ struct mlist *ml;
+ for (ml = mlist->next; ml != mlist; ml = ml->next) {
+ for (magindex = 0; magindex < ml->nmagic; magindex++) {
+ struct magic *m = &ml->magic[magindex];
+ if ((m->flag & mode) != mode) {
+ /* Skip sub-tests */
+ while (magindex + 1 < ml->nmagic &&
+ ml->magic[magindex + 1].cont_level != 0)
+ ++magindex;
+ continue; /* Skip to next top-level test*/
+ }
+
+ /*
+ * Try to iterate over the tree until we find item with
+ * description/mimetype.
+ */
+ while (magindex + 1 < ml->nmagic &&
+ ml->magic[magindex + 1].cont_level != 0 &&
+ *ml->magic[magindex].desc == '\0' &&
+ *ml->magic[magindex].mimetype == '\0')
+ magindex++;
+
+ printf("Strength = %3" SIZE_T_FORMAT "u : %s [%s]\n",
+ apprentice_magic_strength(m),
+ ml->magic[magindex].desc,
+ ml->magic[magindex].mimetype);
+ }
+ }
+}
+
+private void
+set_test_type(struct magic *mstart, struct magic *m)
+{
+ switch (m->type) {
+ case FILE_BYTE:
+ case FILE_SHORT:
+ case FILE_LONG:
+ case FILE_DATE:
+ case FILE_BESHORT:
+ case FILE_BELONG:
+ case FILE_BEDATE:
+ case FILE_LESHORT:
+ case FILE_LELONG:
+ case FILE_LEDATE:
+ case FILE_LDATE:
+ case FILE_BELDATE:
+ case FILE_LELDATE:
+ case FILE_MEDATE:
+ case FILE_MELDATE:
+ case FILE_MELONG:
+ case FILE_QUAD:
+ case FILE_LEQUAD:
+ case FILE_BEQUAD:
+ case FILE_QDATE:
+ case FILE_LEQDATE:
+ case FILE_BEQDATE:
+ case FILE_QLDATE:
+ case FILE_LEQLDATE:
+ case FILE_BEQLDATE:
+ case FILE_QWDATE:
+ case FILE_LEQWDATE:
+ case FILE_BEQWDATE:
+ case FILE_FLOAT:
+ case FILE_BEFLOAT:
+ case FILE_LEFLOAT:
+ case FILE_DOUBLE:
+ case FILE_BEDOUBLE:
+ case FILE_LEDOUBLE:
+ mstart->flag |= BINTEST;
+ break;
+ case FILE_STRING:
+ case FILE_PSTRING:
+ case FILE_BESTRING16:
+ case FILE_LESTRING16:
+ /* Allow text overrides */
+ if (mstart->str_flags & STRING_TEXTTEST)
+ mstart->flag |= TEXTTEST;
+ else
+ mstart->flag |= BINTEST;
+ break;
+ case FILE_REGEX:
+ case FILE_SEARCH:
+ /* Check for override */
+ if (mstart->str_flags & STRING_BINTEST)
+ mstart->flag |= BINTEST;
+ if (mstart->str_flags & STRING_TEXTTEST)
+ mstart->flag |= TEXTTEST;
+
+ if (mstart->flag & (TEXTTEST|BINTEST))
+ break;
+
+ /* binary test if pattern is not text */
+ if (file_looks_utf8(m->value.us, (size_t)m->vallen, NULL,
+ NULL) <= 0)
+ mstart->flag |= BINTEST;
+ else
+ mstart->flag |= TEXTTEST;
+ break;
+ case FILE_DEFAULT:
+ /* can't deduce anything; we shouldn't see this at the
+ top level anyway */
+ break;
+ case FILE_INVALID:
+ default:
+ /* invalid search type, but no need to complain here */
+ break;
+ }
+}
+
+private int
+addentry(struct magic_set *ms, struct magic_entry *me,
+ struct magic_entry **mentry, uint32_t *mentrycount)
+{
+ size_t i = me->mp->type == FILE_NAME ? 1 : 0;
+ if (mentrycount[i] == maxmagic[i]) {
+ struct magic_entry *mp;
+
+ maxmagic[i] += ALLOC_INCR;
+ if ((mp = CAST(struct magic_entry *,
+ realloc(mentry[i], sizeof(*mp) * maxmagic[i]))) ==
+ NULL) {
+ file_oomem(ms, sizeof(*mp) * maxmagic[i]);
+ return -1;
+ }
+ (void)memset(&mp[mentrycount[i]], 0, sizeof(*mp) *
+ ALLOC_INCR);
+ mentry[i] = mp;
+ }
+ mentry[i][mentrycount[i]++] = *me;
+ memset(me, 0, sizeof(*me));
+ return 0;
+}
+
+/*
+ * Load and parse one file.
+ */
+private void
+load_1(struct magic_set *ms, int action, const char *fn, int *errs,
+ struct magic_entry **mentry, uint32_t *mentrycount)
+{
+ size_t lineno = 0, llen = 0;
+ char *line = NULL;
+ ssize_t len;
+ struct magic_entry me;
+
+ FILE *f = fopen(ms->file = fn, "r");
+ if (f == NULL) {
+ if (errno != ENOENT)
+ file_error(ms, errno, "cannot read magic file `%s'",
+ fn);
+ (*errs)++;
+ return;
+ }
+
+ memset(&me, 0, sizeof(me));
+ /* read and parse this file */
+ for (ms->line = 1; (len = getline(&line, &llen, f)) != -1;
+ ms->line++) {
+ if (len == 0) /* null line, garbage, etc */
+ continue;
+ if (line[len - 1] == '\n') {
+ lineno++;
+ line[len - 1] = '\0'; /* delete newline */
+ }
+ switch (line[0]) {
+ case '\0': /* empty, do not parse */
+ case '#': /* comment, do not parse */
+ continue;
+ case '!':
+ if (line[1] == ':') {
+ size_t i;
+
+ for (i = 0; bang[i].name != NULL; i++) {
+ if ((size_t)(len - 2) > bang[i].len &&
+ memcmp(bang[i].name, line + 2,
+ bang[i].len) == 0)
+ break;
+ }
+ if (bang[i].name == NULL) {
+ file_error(ms, 0,
+ "Unknown !: entry `%s'", line);
+ (*errs)++;
+ continue;
+ }
+ if (me.mp == NULL) {
+ file_error(ms, 0,
+ "No current entry for :!%s type",
+ bang[i].name);
+ (*errs)++;
+ continue;
+ }
+ if ((*bang[i].fun)(ms, &me,
+ line + bang[i].len + 2) != 0) {
+ (*errs)++;
+ continue;
+ }
+ continue;
+ }
+ /*FALLTHROUGH*/
+ default:
+ again:
+ switch (parse(ms, &me, line, lineno, action)) {
+ case 0:
+ continue;
+ case 1:
+ (void)addentry(ms, &me, mentry, mentrycount);
+ goto again;
+ default:
+ (*errs)++;
+ break;
+ }
+ }
+ }
+ if (me.mp)
+ (void)addentry(ms, &me, mentry, mentrycount);
+ free(line);
+ (void)fclose(f);
+}
+
+/*
+ * parse a file or directory of files
+ * const char *fn: name of magic file or directory
+ */
+private int
+cmpstrp(const void *p1, const void *p2)
+{
+ return strcmp(*(char *const *)p1, *(char *const *)p2);
+}
+
+
+private uint32_t
+set_text_binary(struct magic_set *ms, struct magic_entry *me, uint32_t nme,
+ uint32_t starttest)
+{
+ static const char text[] = "text";
+ static const char binary[] = "binary";
+ static const size_t len = sizeof(text);
+
+ uint32_t i = starttest;
+
+ do {
+ set_test_type(me[starttest].mp, me[i].mp);
+ if ((ms->flags & MAGIC_DEBUG) == 0)
+ continue;
+ (void)fprintf(stderr, "%s%s%s: %s\n",
+ me[i].mp->mimetype,
+ me[i].mp->mimetype[0] == '\0' ? "" : "; ",
+ me[i].mp->desc[0] ? me[i].mp->desc : "(no description)",
+ me[i].mp->flag & BINTEST ? binary : text);
+ if (me[i].mp->flag & BINTEST) {
+ char *p = strstr(me[i].mp->desc, text);
+ if (p && (p == me[i].mp->desc ||
+ isspace((unsigned char)p[-1])) &&
+ (p + len - me[i].mp->desc == MAXstring
+ || (p[len] == '\0' ||
+ isspace((unsigned char)p[len]))))
+ (void)fprintf(stderr, "*** Possible "
+ "binary test for text type\n");
+ }
+ } while (++i < nme && me[i].mp->cont_level != 0);
+ return i;
+}
+
+private void
+set_last_default(struct magic_set *ms, struct magic_entry *me, uint32_t nme)
+{
+ uint32_t i;
+ for (i = 0; i < nme; i++) {
+ if (me[i].mp->cont_level == 0 &&
+ me[i].mp->type == FILE_DEFAULT) {
+ while (++i < nme)
+ if (me[i].mp->cont_level == 0)
+ break;
+ if (i != nme) {
+ /* XXX - Ugh! */
+ ms->line = me[i].mp->lineno;
+ file_magwarn(ms,
+ "level 0 \"default\" did not sort last");
+ }
+ return;
+ }
+ }
+}
+
+private int
+coalesce_entries(struct magic_set *ms, struct magic_entry *me, uint32_t nme,
+ struct magic **ma, uint32_t *nma)
+{
+ uint32_t i, mentrycount = 0;
+ size_t slen;
+
+ for (i = 0; i < nme; i++)
+ mentrycount += me[i].cont_count;
+
+ slen = sizeof(**ma) * mentrycount;
+ if ((*ma = CAST(struct magic *, malloc(slen))) == NULL) {
+ file_oomem(ms, slen);
+ return -1;
+ }
+
+ mentrycount = 0;
+ for (i = 0; i < nme; i++) {
+ (void)memcpy(*ma + mentrycount, me[i].mp,
+ me[i].cont_count * sizeof(**ma));
+ mentrycount += me[i].cont_count;
+ }
+ *nma = mentrycount;
+ return 0;
+}
+
+private void
+magic_entry_free(struct magic_entry *me, uint32_t nme)
+{
+ uint32_t i;
+ if (me == NULL)
+ return;
+ for (i = 0; i < nme; i++)
+ free(me[i].mp);
+ free(me);
+}
+
+private struct magic_map *
+apprentice_load(struct magic_set *ms, const char *fn, int action)
+{
+ int errs = 0;
+ struct magic_entry *mentry[MAGIC_SETS] = { NULL };
+ uint32_t mentrycount[MAGIC_SETS] = { 0 };
+ uint32_t i, j;
+ size_t files = 0, maxfiles = 0;
+ char **filearr = NULL, *mfn;
+ struct stat st;
+ struct magic_map *map;
+ DIR *dir;
+ struct dirent *d;
+
+ ms->flags |= MAGIC_CHECK; /* Enable checks for parsed files */
+
+ if ((map = CAST(struct magic_map *, calloc(1, sizeof(*map)))) == NULL) {
+ file_oomem(ms, sizeof(*map));
+ return NULL;
+ }
+
+ /* print silly verbose header for USG compat. */
+ if (action == FILE_CHECK)
+ (void)fprintf(stderr, "%s\n", usg_hdr);
+
+ /* load directory or file */
+ if (stat(fn, &st) == 0 && S_ISDIR(st.st_mode)) {
+ dir = opendir(fn);
+ if (!dir) {
+ errs++;
+ goto out;
+ }
+ while ((d = readdir(dir)) != NULL) {
+ if (asprintf(&mfn, "%s/%s", fn, d->d_name) < 0) {
+ file_oomem(ms,
+ strlen(fn) + strlen(d->d_name) + 2);
+ errs++;
+ closedir(dir);
+ goto out;
+ }
+ if (stat(mfn, &st) == -1 || !S_ISREG(st.st_mode)) {
+ free(mfn);
+ continue;
+ }
+ if (files >= maxfiles) {
+ size_t mlen;
+ maxfiles = (maxfiles + 1) * 2;
+ mlen = maxfiles * sizeof(*filearr);
+ if ((filearr = CAST(char **,
+ realloc(filearr, mlen))) == NULL) {
+ file_oomem(ms, mlen);
+ free(mfn);
+ closedir(dir);
+ errs++;
+ goto out;
+ }
+ }
+ filearr[files++] = mfn;
+ }
+ closedir(dir);
+ qsort(filearr, files, sizeof(*filearr), cmpstrp);
+ for (i = 0; i < files; i++) {
+ load_1(ms, action, filearr[i], &errs, mentry,
+ mentrycount);
+ free(filearr[i]);
+ }
+ free(filearr);
+ } else
+ load_1(ms, action, fn, &errs, mentry, mentrycount);
+ if (errs)
+ goto out;
+
+ for (j = 0; j < MAGIC_SETS; j++) {
+ /* Set types of tests */
+ for (i = 0; i < mentrycount[j]; ) {
+ if (mentry[j][i].mp->cont_level != 0) {
+ i++;
+ continue;
+ }
+ i = set_text_binary(ms, mentry[j], mentrycount[j], i);
+ }
+ qsort(mentry[j], mentrycount[j], sizeof(*mentry[j]),
+ apprentice_sort);
+
+ /*
+ * Make sure that any level 0 "default" line is last
+ * (if one exists).
+ */
+ set_last_default(ms, mentry[j], mentrycount[j]);
+
+ /* coalesce per file arrays into a single one */
+ if (coalesce_entries(ms, mentry[j], mentrycount[j],
+ &map->magic[j], &map->nmagic[j]) == -1) {
+ errs++;
+ goto out;
+ }
+ }
+
+out:
+ for (j = 0; j < MAGIC_SETS; j++)
+ magic_entry_free(mentry[j], mentrycount[j]);
+
+ if (errs) {
+ for (j = 0; j < MAGIC_SETS; j++) {
+ if (map->magic[j])
+ free(map->magic[j]);
+ }
+ free(map);
+ return NULL;
+ }
+ return map;
+}
+
+/*
+ * extend the sign bit if the comparison is to be signed
+ */
+protected uint64_t
+file_signextend(struct magic_set *ms, struct magic *m, uint64_t v)
+{
+ if (!(m->flag & UNSIGNED)) {
+ switch(m->type) {
+ /*
+ * Do not remove the casts below. They are
+ * vital. When later compared with the data,
+ * the sign extension must have happened.
+ */
+ case FILE_BYTE:
+ v = (char) v;
+ break;
+ case FILE_SHORT:
+ case FILE_BESHORT:
+ case FILE_LESHORT:
+ v = (short) v;
+ break;
+ case FILE_DATE:
+ case FILE_BEDATE:
+ case FILE_LEDATE:
+ case FILE_MEDATE:
+ case FILE_LDATE:
+ case FILE_BELDATE:
+ case FILE_LELDATE:
+ case FILE_MELDATE:
+ case FILE_LONG:
+ case FILE_BELONG:
+ case FILE_LELONG:
+ case FILE_MELONG:
+ case FILE_FLOAT:
+ case FILE_BEFLOAT:
+ case FILE_LEFLOAT:
+ v = (int32_t) v;
+ break;
+ case FILE_QUAD:
+ case FILE_BEQUAD:
+ case FILE_LEQUAD:
+ case FILE_QDATE:
+ case FILE_QLDATE:
+ case FILE_QWDATE:
+ case FILE_BEQDATE:
+ case FILE_BEQLDATE:
+ case FILE_BEQWDATE:
+ case FILE_LEQDATE:
+ case FILE_LEQLDATE:
+ case FILE_LEQWDATE:
+ case FILE_DOUBLE:
+ case FILE_BEDOUBLE:
+ case FILE_LEDOUBLE:
+ v = (int64_t) v;
+ break;
+ case FILE_STRING:
+ case FILE_PSTRING:
+ case FILE_BESTRING16:
+ case FILE_LESTRING16:
+ case FILE_REGEX:
+ case FILE_SEARCH:
+ case FILE_DEFAULT:
+ case FILE_INDIRECT:
+ case FILE_NAME:
+ case FILE_USE:
+ break;
+ default:
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "cannot happen: m->type=%d\n",
+ m->type);
+ return ~0U;
+ }
+ }
+ return v;
+}
+
+private int
+string_modifier_check(struct magic_set *ms, struct magic *m)
+{
+ if ((ms->flags & MAGIC_CHECK) == 0)
+ return 0;
+
+ if (m->type != FILE_PSTRING && (m->str_flags & PSTRING_LEN) != 0) {
+ file_magwarn(ms,
+ "'/BHhLl' modifiers are only allowed for pascal strings\n");
+ return -1;
+ }
+ switch (m->type) {
+ case FILE_BESTRING16:
+ case FILE_LESTRING16:
+ if (m->str_flags != 0) {
+ file_magwarn(ms,
+ "no modifiers allowed for 16-bit strings\n");
+ return -1;
+ }
+ break;
+ case FILE_STRING:
+ case FILE_PSTRING:
+ if ((m->str_flags & REGEX_OFFSET_START) != 0) {
+ file_magwarn(ms,
+ "'/%c' only allowed on regex and search\n",
+ CHAR_REGEX_OFFSET_START);
+ return -1;
+ }
+ break;
+ case FILE_SEARCH:
+ if (m->str_range == 0) {
+ file_magwarn(ms,
+ "missing range; defaulting to %d\n",
+ STRING_DEFAULT_RANGE);
+ m->str_range = STRING_DEFAULT_RANGE;
+ return -1;
+ }
+ break;
+ case FILE_REGEX:
+ if ((m->str_flags & STRING_COMPACT_WHITESPACE) != 0) {
+ file_magwarn(ms, "'/%c' not allowed on regex\n",
+ CHAR_COMPACT_WHITESPACE);
+ return -1;
+ }
+ if ((m->str_flags & STRING_COMPACT_OPTIONAL_WHITESPACE) != 0) {
+ file_magwarn(ms, "'/%c' not allowed on regex\n",
+ CHAR_COMPACT_OPTIONAL_WHITESPACE);
+ return -1;
+ }
+ break;
+ default:
+ file_magwarn(ms, "coding error: m->type=%d\n",
+ m->type);
+ return -1;
+ }
+ return 0;
+}
+
+private int
+get_op(char c)
+{
+ switch (c) {
+ case '&':
+ return FILE_OPAND;
+ case '|':
+ return FILE_OPOR;
+ case '^':
+ return FILE_OPXOR;
+ case '+':
+ return FILE_OPADD;
+ case '-':
+ return FILE_OPMINUS;
+ case '*':
+ return FILE_OPMULTIPLY;
+ case '/':
+ return FILE_OPDIVIDE;
+ case '%':
+ return FILE_OPMODULO;
+ default:
+ return -1;
+ }
+}
+
+#ifdef ENABLE_CONDITIONALS
+private int
+get_cond(const char *l, const char **t)
+{
+ static const struct cond_tbl_s {
+ char name[8];
+ size_t len;
+ int cond;
+ } cond_tbl[] = {
+ { "if", 2, COND_IF },
+ { "elif", 4, COND_ELIF },
+ { "else", 4, COND_ELSE },
+ { "", 0, COND_NONE },
+ };
+ const struct cond_tbl_s *p;
+
+ for (p = cond_tbl; p->len; p++) {
+ if (strncmp(l, p->name, p->len) == 0 &&
+ isspace((unsigned char)l[p->len])) {
+ if (t)
+ *t = l + p->len;
+ break;
+ }
+ }
+ return p->cond;
+}
+
+private int
+check_cond(struct magic_set *ms, int cond, uint32_t cont_level)
+{
+ int last_cond;
+ last_cond = ms->c.li[cont_level].last_cond;
+
+ switch (cond) {
+ case COND_IF:
+ if (last_cond != COND_NONE && last_cond != COND_ELIF) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "syntax error: `if'");
+ return -1;
+ }
+ last_cond = COND_IF;
+ break;
+
+ case COND_ELIF:
+ if (last_cond != COND_IF && last_cond != COND_ELIF) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "syntax error: `elif'");
+ return -1;
+ }
+ last_cond = COND_ELIF;
+ break;
+
+ case COND_ELSE:
+ if (last_cond != COND_IF && last_cond != COND_ELIF) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "syntax error: `else'");
+ return -1;
+ }
+ last_cond = COND_NONE;
+ break;
+
+ case COND_NONE:
+ last_cond = COND_NONE;
+ break;
+ }
+
+ ms->c.li[cont_level].last_cond = last_cond;
+ return 0;
+}
+#endif /* ENABLE_CONDITIONALS */
+
+/*
+ * parse one line from magic file, put into magic[index++] if valid
+ */
+private int
+parse(struct magic_set *ms, struct magic_entry *me, const char *line,
+ size_t lineno, int action)
+{
+#ifdef ENABLE_CONDITIONALS
+ static uint32_t last_cont_level = 0;
+#endif
+ size_t i;
+ struct magic *m;
+ const char *l = line;
+ char *t;
+ int op;
+ uint32_t cont_level;
+ int32_t diff;
+
+ cont_level = 0;
+
+ /*
+ * Parse the offset.
+ */
+ while (*l == '>') {
+ ++l; /* step over */
+ cont_level++;
+ }
+#ifdef ENABLE_CONDITIONALS
+ if (cont_level == 0 || cont_level > last_cont_level)
+ if (file_check_mem(ms, cont_level) == -1)
+ return -1;
+ last_cont_level = cont_level;
+#endif
+ if (cont_level != 0) {
+ if (me->mp == NULL) {
+ file_magerror(ms, "No current entry for continuation");
+ return -1;
+ }
+ if (me->cont_count == 0) {
+ file_magerror(ms, "Continuations present with 0 count");
+ return -1;
+ }
+ m = &me->mp[me->cont_count - 1];
+ diff = (int32_t)cont_level - (int32_t)m->cont_level;
+ if (diff > 1)
+ file_magwarn(ms, "New continuation level %u is more "
+ "than one larger than current level %u", cont_level,
+ m->cont_level);
+ if (me->cont_count == me->max_count) {
+ struct magic *nm;
+ size_t cnt = me->max_count + ALLOC_CHUNK;
+ if ((nm = CAST(struct magic *, realloc(me->mp,
+ sizeof(*nm) * cnt))) == NULL) {
+ file_oomem(ms, sizeof(*nm) * cnt);
+ return -1;
+ }
+ me->mp = m = nm;
+ me->max_count = CAST(uint32_t, cnt);
+ }
+ m = &me->mp[me->cont_count++];
+ (void)memset(m, 0, sizeof(*m));
+ m->cont_level = cont_level;
+ } else {
+ static const size_t len = sizeof(*m) * ALLOC_CHUNK;
+ if (me->mp != NULL)
+ return 1;
+ if ((m = CAST(struct magic *, malloc(len))) == NULL) {
+ file_oomem(ms, len);
+ return -1;
+ }
+ me->mp = m;
+ me->max_count = ALLOC_CHUNK;
+ (void)memset(m, 0, sizeof(*m));
+ m->factor_op = FILE_FACTOR_OP_NONE;
+ m->cont_level = 0;
+ me->cont_count = 1;
+ }
+ m->lineno = CAST(uint32_t, lineno);
+
+ if (*l == '&') { /* m->cont_level == 0 checked below. */
+ ++l; /* step over */
+ m->flag |= OFFADD;
+ }
+ if (*l == '(') {
+ ++l; /* step over */
+ m->flag |= INDIR;
+ if (m->flag & OFFADD)
+ m->flag = (m->flag & ~OFFADD) | INDIROFFADD;
+
+ if (*l == '&') { /* m->cont_level == 0 checked below */
+ ++l; /* step over */
+ m->flag |= OFFADD;
+ }
+ }
+ /* Indirect offsets are not valid at level 0. */
+ if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD)))
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "relative offset at level 0");
+
+ /* get offset, then skip over it */
+ m->offset = (uint32_t)strtoul(l, &t, 0);
+ if (l == t)
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "offset `%s' invalid", l);
+ l = t;
+
+ if (m->flag & INDIR) {
+ m->in_type = FILE_LONG;
+ m->in_offset = 0;
+ /*
+ * read [.lbs][+-]nnnnn)
+ */
+ if (*l == '.') {
+ l++;
+ switch (*l) {
+ case 'l':
+ m->in_type = FILE_LELONG;
+ break;
+ case 'L':
+ m->in_type = FILE_BELONG;
+ break;
+ case 'm':
+ m->in_type = FILE_MELONG;
+ break;
+ case 'h':
+ case 's':
+ m->in_type = FILE_LESHORT;
+ break;
+ case 'H':
+ case 'S':
+ m->in_type = FILE_BESHORT;
+ break;
+ case 'c':
+ case 'b':
+ case 'C':
+ case 'B':
+ m->in_type = FILE_BYTE;
+ break;
+ case 'e':
+ case 'f':
+ case 'g':
+ m->in_type = FILE_LEDOUBLE;
+ break;
+ case 'E':
+ case 'F':
+ case 'G':
+ m->in_type = FILE_BEDOUBLE;
+ break;
+ case 'i':
+ m->in_type = FILE_LEID3;
+ break;
+ case 'I':
+ m->in_type = FILE_BEID3;
+ break;
+ default:
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms,
+ "indirect offset type `%c' invalid",
+ *l);
+ break;
+ }
+ l++;
+ }
+
+ m->in_op = 0;
+ if (*l == '~') {
+ m->in_op |= FILE_OPINVERSE;
+ l++;
+ }
+ if ((op = get_op(*l)) != -1) {
+ m->in_op |= op;
+ l++;
+ }
+ if (*l == '(') {
+ m->in_op |= FILE_OPINDIRECT;
+ l++;
+ }
+ if (isdigit((unsigned char)*l) || *l == '-') {
+ m->in_offset = (int32_t)strtol(l, &t, 0);
+ if (l == t)
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms,
+ "in_offset `%s' invalid", l);
+ l = t;
+ }
+ if (*l++ != ')' ||
+ ((m->in_op & FILE_OPINDIRECT) && *l++ != ')'))
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms,
+ "missing ')' in indirect offset");
+ }
+ EATAB;
+
+#ifdef ENABLE_CONDITIONALS
+ m->cond = get_cond(l, &l);
+ if (check_cond(ms, m->cond, cont_level) == -1)
+ return -1;
+
+ EATAB;
+#endif
+
+ /*
+ * Parse the type.
+ */
+ if (*l == 'u') {
+ /*
+ * Try it as a keyword type prefixed by "u"; match what
+ * follows the "u". If that fails, try it as an SUS
+ * integer type.
+ */
+ m->type = get_type(type_tbl, l + 1, &l);
+ if (m->type == FILE_INVALID) {
+ /*
+ * Not a keyword type; parse it as an SUS type,
+ * 'u' possibly followed by a number or C/S/L.
+ */
+ m->type = get_standard_integer_type(l, &l);
+ }
+ // It's unsigned.
+ if (m->type != FILE_INVALID)
+ m->flag |= UNSIGNED;
+ } else {
+ /*
+ * Try it as a keyword type. If that fails, try it as
+ * an SUS integer type if it begins with "d" or as an
+ * SUS string type if it begins with "s". In any case,
+ * it's not unsigned.
+ */
+ m->type = get_type(type_tbl, l, &l);
+ if (m->type == FILE_INVALID) {
+ /*
+ * Not a keyword type; parse it as an SUS type,
+ * either 'd' possibly followed by a number or
+ * C/S/L, or just 's'.
+ */
+ if (*l == 'd')
+ m->type = get_standard_integer_type(l, &l);
+ else if (*l == 's' && !isalpha((unsigned char)l[1])) {
+ m->type = FILE_STRING;
+ ++l;
+ }
+ }
+ }
+
+ if (m->type == FILE_INVALID) {
+ /* Not found - try it as a special keyword. */
+ m->type = get_type(special_tbl, l, &l);
+ }
+
+ if (m->type == FILE_INVALID) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "type `%s' invalid", l);
+ return -1;
+ }
+
+ /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
+ /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */
+
+ m->mask_op = 0;
+ if (*l == '~') {
+ if (!IS_STRING(m->type))
+ m->mask_op |= FILE_OPINVERSE;
+ else if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "'~' invalid for string types");
+ ++l;
+ }
+ m->str_range = 0;
+ m->str_flags = m->type == FILE_PSTRING ? PSTRING_1_LE : 0;
+ if ((op = get_op(*l)) != -1) {
+ if (!IS_STRING(m->type)) {
+ uint64_t val;
+ ++l;
+ m->mask_op |= op;
+ val = (uint64_t)strtoull(l, &t, 0);
+ l = t;
+ m->num_mask = file_signextend(ms, m, val);
+ eatsize(&l);
+ }
+ else if (op == FILE_OPDIVIDE) {
+ int have_range = 0;
+ while (!isspace((unsigned char)*++l)) {
+ switch (*l) {
+ case '0': case '1': case '2':
+ case '3': case '4': case '5':
+ case '6': case '7': case '8':
+ case '9':
+ if (have_range &&
+ (ms->flags & MAGIC_CHECK))
+ file_magwarn(ms,
+ "multiple ranges");
+ have_range = 1;
+ m->str_range = CAST(uint32_t,
+ strtoul(l, &t, 0));
+ if (m->str_range == 0)
+ file_magwarn(ms,
+ "zero range");
+ l = t - 1;
+ break;
+ case CHAR_COMPACT_WHITESPACE:
+ m->str_flags |=
+ STRING_COMPACT_WHITESPACE;
+ break;
+ case CHAR_COMPACT_OPTIONAL_WHITESPACE:
+ m->str_flags |=
+ STRING_COMPACT_OPTIONAL_WHITESPACE;
+ break;
+ case CHAR_IGNORE_LOWERCASE:
+ m->str_flags |= STRING_IGNORE_LOWERCASE;
+ break;
+ case CHAR_IGNORE_UPPERCASE:
+ m->str_flags |= STRING_IGNORE_UPPERCASE;
+ break;
+ case CHAR_REGEX_OFFSET_START:
+ m->str_flags |= REGEX_OFFSET_START;
+ break;
+ case CHAR_BINTEST:
+ m->str_flags |= STRING_BINTEST;
+ break;
+ case CHAR_TEXTTEST:
+ m->str_flags |= STRING_TEXTTEST;
+ break;
+ case CHAR_TRIM:
+ m->str_flags |= STRING_TRIM;
+ break;
+ case CHAR_PSTRING_1_LE:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_1_LE;
+ break;
+ case CHAR_PSTRING_2_BE:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_BE;
+ break;
+ case CHAR_PSTRING_2_LE:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_LE;
+ break;
+ case CHAR_PSTRING_4_BE:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_BE;
+ break;
+ case CHAR_PSTRING_4_LE:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_LE;
+ break;
+ case CHAR_PSTRING_LENGTH_INCLUDES_ITSELF:
+ if (m->type != FILE_PSTRING)
+ goto bad;
+ m->str_flags |= PSTRING_LENGTH_INCLUDES_ITSELF;
+ break;
+ default:
+ bad:
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms,
+ "string extension `%c' "
+ "invalid", *l);
+ return -1;
+ }
+ /* allow multiple '/' for readability */
+ if (l[1] == '/' &&
+ !isspace((unsigned char)l[2]))
+ l++;
+ }
+ if (string_modifier_check(ms, m) == -1)
+ return -1;
+ }
+ else {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "invalid string op: %c", *t);
+ return -1;
+ }
+ }
+ /*
+ * We used to set mask to all 1's here, instead let's just not do
+ * anything if mask = 0 (unless you have a better idea)
+ */
+ EATAB;
+
+ switch (*l) {
+ case '>':
+ case '<':
+ m->reln = *l;
+ ++l;
+ if (*l == '=') {
+ if (ms->flags & MAGIC_CHECK) {
+ file_magwarn(ms, "%c= not supported",
+ m->reln);
+ return -1;
+ }
+ ++l;
+ }
+ break;
+ /* Old-style anding: "0 byte &0x80 dynamically linked" */
+ case '&':
+ case '^':
+ case '=':
+ m->reln = *l;
+ ++l;
+ if (*l == '=') {
+ /* HP compat: ignore &= etc. */
+ ++l;
+ }
+ break;
+ case '!':
+ m->reln = *l;
+ ++l;
+ break;
+ default:
+ m->reln = '='; /* the default relation */
+ if (*l == 'x' && ((isascii((unsigned char)l[1]) &&
+ isspace((unsigned char)l[1])) || !l[1])) {
+ m->reln = *l;
+ ++l;
+ }
+ break;
+ }
+ /*
+ * Grab the value part, except for an 'x' reln.
+ */
+ if (m->reln != 'x' && getvalue(ms, m, &l, action))
+ return -1;
+
+ /*
+ * TODO finish this macro and start using it!
+ * #define offsetcheck {if (offset > HOWMANY-1)
+ * magwarn("offset too big"); }
+ */
+
+ /*
+ * Now get last part - the description
+ */
+ EATAB;
+ if (l[0] == '\b') {
+ ++l;
+ m->flag |= NOSPACE;
+ } else if ((l[0] == '\\') && (l[1] == 'b')) {
+ ++l;
+ ++l;
+ m->flag |= NOSPACE;
+ }
+ for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof(m->desc); )
+ continue;
+ if (i == sizeof(m->desc)) {
+ m->desc[sizeof(m->desc) - 1] = '\0';
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "description `%s' truncated", m->desc);
+ }
+
+ /*
+ * We only do this check while compiling, or if any of the magic
+ * files were not compiled.
+ */
+ if (ms->flags & MAGIC_CHECK) {
+ if (check_format(ms, m) == -1)
+ return -1;
+ }
+#ifndef COMPILE_ONLY
+ if (action == FILE_CHECK) {
+ file_mdump(m);
+ }
+#endif
+ m->mimetype[0] = '\0'; /* initialise MIME type to none */
+ return 0;
+}
+
+/*
+ * parse a STRENGTH annotation line from magic file, put into magic[index - 1]
+ * if valid
+ */
+private int
+parse_strength(struct magic_set *ms, struct magic_entry *me, const char *line)
+{
+ const char *l = line;
+ char *el;
+ unsigned long factor;
+ struct magic *m = &me->mp[0];
+
+ if (m->factor_op != FILE_FACTOR_OP_NONE) {
+ file_magwarn(ms,
+ "Current entry already has a strength type: %c %d",
+ m->factor_op, m->factor);
+ return -1;
+ }
+ EATAB;
+ switch (*l) {
+ case FILE_FACTOR_OP_NONE:
+ case FILE_FACTOR_OP_PLUS:
+ case FILE_FACTOR_OP_MINUS:
+ case FILE_FACTOR_OP_TIMES:
+ case FILE_FACTOR_OP_DIV:
+ m->factor_op = *l++;
+ break;
+ default:
+ file_magwarn(ms, "Unknown factor op `%c'", *l);
+ return -1;
+ }
+ EATAB;
+ factor = strtoul(l, &el, 0);
+ if (factor > 255) {
+ file_magwarn(ms, "Too large factor `%lu'", factor);
+ goto out;
+ }
+ if (*el && !isspace((unsigned char)*el)) {
+ file_magwarn(ms, "Bad factor `%s'", l);
+ goto out;
+ }
+ m->factor = (uint8_t)factor;
+ if (m->factor == 0 && m->factor_op == FILE_FACTOR_OP_DIV) {
+ file_magwarn(ms, "Cannot have factor op `%c' and factor %u",
+ m->factor_op, m->factor);
+ goto out;
+ }
+ return 0;
+out:
+ m->factor_op = FILE_FACTOR_OP_NONE;
+ m->factor = 0;
+ return -1;
+}
+
+/*
+ * Parse an Apple CREATOR/TYPE annotation from magic file and put it into
+ * magic[index - 1]
+ */
+private int
+parse_apple(struct magic_set *ms, struct magic_entry *me, const char *line)
+{
+ size_t i;
+ const char *l = line;
+ struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
+
+ if (m->apple[0] != '\0') {
+ file_magwarn(ms, "Current entry already has a APPLE type "
+ "`%.8s', new type `%s'", m->mimetype, l);
+ return -1;
+ }
+
+ EATAB;
+ for (i = 0; *l && ((isascii((unsigned char)*l) &&
+ isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
+ i < sizeof(m->apple); m->apple[i++] = *l++)
+ continue;
+ if (i == sizeof(m->apple) && *l) {
+ /* We don't need to NUL terminate here, printing handles it */
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "APPLE type `%s' truncated %"
+ SIZE_T_FORMAT "u", line, i);
+ }
+
+ if (i > 0)
+ return 0;
+ else
+ return -1;
+}
+
+/*
+ * parse a MIME annotation line from magic file, put into magic[index - 1]
+ * if valid
+ */
+private int
+parse_mime(struct magic_set *ms, struct magic_entry *me, const char *line)
+{
+ size_t i;
+ const char *l = line;
+ struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
+
+ if (m->mimetype[0] != '\0') {
+ file_magwarn(ms, "Current entry already has a MIME type `%s',"
+ " new type `%s'", m->mimetype, l);
+ return -1;
+ }
+
+ EATAB;
+ for (i = 0; *l && ((isascii((unsigned char)*l) &&
+ isalnum((unsigned char)*l)) || strchr("-+/.", *l)) &&
+ i < sizeof(m->mimetype); m->mimetype[i++] = *l++)
+ continue;
+ if (i == sizeof(m->mimetype)) {
+ m->mimetype[sizeof(m->mimetype) - 1] = '\0';
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "MIME type `%s' truncated %"
+ SIZE_T_FORMAT "u", m->mimetype, i);
+ } else
+ m->mimetype[i] = '\0';
+
+ if (i > 0)
+ return 0;
+ else
+ return -1;
+}
+
+private int
+check_format_type(const char *ptr, int type)
+{
+ int quad = 0;
+ if (*ptr == '\0') {
+ /* Missing format string; bad */
+ return -1;
+ }
+
+ switch (type) {
+ case FILE_FMT_QUAD:
+ quad = 1;
+ /*FALLTHROUGH*/
+ case FILE_FMT_NUM:
+ if (*ptr == '-')
+ ptr++;
+ if (*ptr == '.')
+ ptr++;
+ while (isdigit((unsigned char)*ptr)) ptr++;
+ if (*ptr == '.')
+ ptr++;
+ while (isdigit((unsigned char)*ptr)) ptr++;
+ if (quad) {
+ if (*ptr++ != 'l')
+ return -1;
+ if (*ptr++ != 'l')
+ return -1;
+ }
+
+ switch (*ptr++) {
+ case 'l':
+ switch (*ptr++) {
+ case 'i':
+ case 'd':
+ case 'u':
+ case 'x':
+ case 'X':
+ return 0;
+ default:
+ return -1;
+ }
+
+ case 'h':
+ switch (*ptr++) {
+ case 'h':
+ switch (*ptr++) {
+ case 'i':
+ case 'd':
+ case 'u':
+ case 'x':
+ case 'X':
+ return 0;
+ default:
+ return -1;
+ }
+ case 'd':
+ return 0;
+ default:
+ return -1;
+ }
+
+ case 'i':
+ case 'c':
+ case 'd':
+ case 'u':
+ case 'x':
+ case 'X':
+ return 0;
+
+ default:
+ return -1;
+ }
+
+ case FILE_FMT_FLOAT:
+ case FILE_FMT_DOUBLE:
+ if (*ptr == '-')
+ ptr++;
+ if (*ptr == '.')
+ ptr++;
+ while (isdigit((unsigned char)*ptr)) ptr++;
+ if (*ptr == '.')
+ ptr++;
+ while (isdigit((unsigned char)*ptr)) ptr++;
+
+ switch (*ptr++) {
+ case 'e':
+ case 'E':
+ case 'f':
+ case 'F':
+ case 'g':
+ case 'G':
+ return 0;
+
+ default:
+ return -1;
+ }
+
+
+ case FILE_FMT_STR:
+ if (*ptr == '-')
+ ptr++;
+ while (isdigit((unsigned char )*ptr))
+ ptr++;
+ if (*ptr == '.') {
+ ptr++;
+ while (isdigit((unsigned char )*ptr))
+ ptr++;
+ }
+
+ switch (*ptr++) {
+ case 's':
+ return 0;
+ default:
+ return -1;
+ }
+
+ default:
+ /* internal error */
+ abort();
+ }
+ /*NOTREACHED*/
+ return -1;
+}
+
+/*
+ * Check that the optional printf format in description matches
+ * the type of the magic.
+ */
+private int
+check_format(struct magic_set *ms, struct magic *m)
+{
+ char *ptr;
+
+ for (ptr = m->desc; *ptr; ptr++)
+ if (*ptr == '%')
+ break;
+ if (*ptr == '\0') {
+ /* No format string; ok */
+ return 1;
+ }
+
+ assert(file_nformats == file_nnames);
+
+ if (m->type >= file_nformats) {
+ file_magwarn(ms, "Internal error inconsistency between "
+ "m->type and format strings");
+ return -1;
+ }
+ if (file_formats[m->type] == FILE_FMT_NONE) {
+ file_magwarn(ms, "No format string for `%s' with description "
+ "`%s'", m->desc, file_names[m->type]);
+ return -1;
+ }
+
+ ptr++;
+ if (check_format_type(ptr, file_formats[m->type]) == -1) {
+ /*
+ * TODO: this error message is unhelpful if the format
+ * string is not one character long
+ */
+ file_magwarn(ms, "Printf format `%c' is not valid for type "
+ "`%s' in description `%s'", *ptr ? *ptr : '?',
+ file_names[m->type], m->desc);
+ return -1;
+ }
+
+ for (; *ptr; ptr++) {
+ if (*ptr == '%') {
+ file_magwarn(ms,
+ "Too many format strings (should have at most one) "
+ "for `%s' with description `%s'",
+ file_names[m->type], m->desc);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Read a numeric value from a pointer, into the value union of a magic
+ * pointer, according to the magic type. Update the string pointer to point
+ * just after the number read. Return 0 for success, non-zero for failure.
+ */
+private int
+getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
+{
+ switch (m->type) {
+ case FILE_BESTRING16:
+ case FILE_LESTRING16:
+ case FILE_STRING:
+ case FILE_PSTRING:
+ case FILE_REGEX:
+ case FILE_SEARCH:
+ case FILE_NAME:
+ case FILE_USE:
+ *p = getstr(ms, m, *p, action == FILE_COMPILE);
+ if (*p == NULL) {
+ if (ms->flags & MAGIC_CHECK)
+ file_magwarn(ms, "cannot get string from `%s'",
+ m->value.s);
+ return -1;
+ }
+ return 0;
+ case FILE_FLOAT:
+ case FILE_BEFLOAT:
+ case FILE_LEFLOAT:
+ if (m->reln != 'x') {
+ char *ep;
+#ifdef HAVE_STRTOF
+ m->value.f = strtof(*p, &ep);
+#else
+ m->value.f = (float)strtod(*p, &ep);
+#endif
+ *p = ep;
+ }
+ return 0;
+ case FILE_DOUBLE:
+ case FILE_BEDOUBLE:
+ case FILE_LEDOUBLE:
+ if (m->reln != 'x') {
+ char *ep;
+ m->value.d = strtod(*p, &ep);
+ *p = ep;
+ }
+ return 0;
+ default:
+ if (m->reln != 'x') {
+ char *ep;
+ m->value.q = file_signextend(ms, m,
+ (uint64_t)strtoull(*p, &ep, 0));
+ *p = ep;
+ eatsize(p);
+ }
+ return 0;
+ }
+}
+
+/*
+ * Convert a string containing C character escapes. Stop at an unescaped
+ * space or tab.
+ * Copy the converted version to "m->value.s", and the length in m->vallen.
+ * Return updated scan pointer as function result. Warn if set.
+ */
+private const char *
+getstr(struct magic_set *ms, struct magic *m, const char *s, int warn)
+{
+ const char *origs = s;
+ char *p = m->value.s;
+ size_t plen = sizeof(m->value.s);
+ char *origp = p;
+ char *pmax = p + plen - 1;
+ int c;
+ int val;
+
+ while ((c = *s++) != '\0') {
+ if (isspace((unsigned char) c))
+ break;
+ if (p >= pmax) {
+ file_error(ms, 0, "string too long: `%s'", origs);
+ return NULL;
+ }
+ if (c == '\\') {
+ switch(c = *s++) {
+
+ case '\0':
+ if (warn)
+ file_magwarn(ms, "incomplete escape");
+ goto out;
+
+ case '\t':
+ if (warn) {
+ file_magwarn(ms,
+ "escaped tab found, use \\t instead");
+ warn = 0; /* already did */
+ }
+ /*FALLTHROUGH*/
+ default:
+ if (warn) {
+ if (isprint((unsigned char)c)) {
+ /* Allow escaping of
+ * ``relations'' */
+ if (strchr("<>&^=!", c) == NULL
+ && (m->type != FILE_REGEX ||
+ strchr("[]().*?^$|{}", c)
+ == NULL)) {
+ file_magwarn(ms, "no "
+ "need to escape "
+ "`%c'", c);
+ }
+ } else {
+ file_magwarn(ms,
+ "unknown escape sequence: "
+ "\\%03o", c);
+ }
+ }
+ /*FALLTHROUGH*/
+ /* space, perhaps force people to use \040? */
+ case ' ':
+#if 0
+ /*
+ * Other things people escape, but shouldn't need to,
+ * so we disallow them
+ */
+ case '\'':
+ case '"':
+ case '?':
+#endif
+ /* Relations */
+ case '>':
+ case '<':
+ case '&':
+ case '^':
+ case '=':
+ case '!':
+ /* and baskslash itself */
+ case '\\':
+ *p++ = (char) c;
+ break;
+
+ case 'a':
+ *p++ = '\a';
+ break;
+
+ case 'b':
+ *p++ = '\b';
+ break;
+
+ case 'f':
+ *p++ = '\f';
+ break;
+
+ case 'n':
+ *p++ = '\n';
+ break;
+
+ case 'r':
+ *p++ = '\r';
+ break;
+
+ case 't':
+ *p++ = '\t';
+ break;
+
+ case 'v':
+ *p++ = '\v';
+ break;
+
+ /* \ and up to 3 octal digits */
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ val = c - '0';
+ c = *s++; /* try for 2 */
+ if (c >= '0' && c <= '7') {
+ val = (val << 3) | (c - '0');
+ c = *s++; /* try for 3 */
+ if (c >= '0' && c <= '7')
+ val = (val << 3) | (c-'0');
+ else
+ --s;
+ }
+ else
+ --s;
+ *p++ = (char)val;
+ break;
+
+ /* \x and up to 2 hex digits */
+ case 'x':
+ val = 'x'; /* Default if no digits */
+ c = hextoint(*s++); /* Get next char */
+ if (c >= 0) {
+ val = c;
+ c = hextoint(*s++);
+ if (c >= 0)
+ val = (val << 4) + c;
+ else
+ --s;
+ } else
+ --s;
+ *p++ = (char)val;
+ break;
+ }
+ } else
+ *p++ = (char)c;
+ }
+out:
+ *p = '\0';
+ m->vallen = CAST(unsigned char, (p - origp));
+ if (m->type == FILE_PSTRING)
+ m->vallen += (unsigned char)file_pstring_length_size(m);
+ return s;
+}
+
+
+/* Single hex char to int; -1 if not a hex char. */
+private int
+hextoint(int c)
+{
+ if (!isascii((unsigned char) c))
+ return -1;
+ if (isdigit((unsigned char) c))
+ return c - '0';
+ if ((c >= 'a') && (c <= 'f'))
+ return c + 10 - 'a';
+ if (( c>= 'A') && (c <= 'F'))
+ return c + 10 - 'A';
+ return -1;
+}
+
+
+/*
+ * Print a string containing C character escapes.
+ */
+protected void
+file_showstr(FILE *fp, const char *s, size_t len)
+{
+ char c;
+
+ for (;;) {
+ if (len == ~0U) {
+ c = *s++;
+ if (c == '\0')
+ break;
+ }
+ else {
+ if (len-- == 0)
+ break;
+ c = *s++;
+ }
+ if (c >= 040 && c <= 0176) /* TODO isprint && !iscntrl */
+ (void) fputc(c, fp);
+ else {
+ (void) fputc('\\', fp);
+ switch (c) {
+ case '\a':
+ (void) fputc('a', fp);
+ break;
+
+ case '\b':
+ (void) fputc('b', fp);
+ break;
+
+ case '\f':
+ (void) fputc('f', fp);
+ break;
+
+ case '\n':
+ (void) fputc('n', fp);
+ break;
+
+ case '\r':
+ (void) fputc('r', fp);
+ break;
+
+ case '\t':
+ (void) fputc('t', fp);
+ break;
+
+ case '\v':
+ (void) fputc('v', fp);
+ break;
+
+ default:
+ (void) fprintf(fp, "%.3o", c & 0377);
+ break;
+ }
+ }
+ }
+}
+
+/*
+ * eatsize(): Eat the size spec from a number [eg. 10UL]
+ */
+private void
+eatsize(const char **p)
+{
+ const char *l = *p;
+
+ if (LOWCASE(*l) == 'u')
+ l++;
+
+ switch (LOWCASE(*l)) {
+ case 'l': /* long */
+ case 's': /* short */
+ case 'h': /* short */
+ case 'b': /* char/byte */
+ case 'c': /* char/byte */
+ l++;
+ /*FALLTHROUGH*/
+ default:
+ break;
+ }
+
+ *p = l;
+}
+
+/*
+ * handle a compiled file.
+ */
+
+private struct magic_map *
+apprentice_map(struct magic_set *ms, const char *fn)
+{
+ int fd;
+ struct stat st;
+ uint32_t *ptr;
+ uint32_t version, entries, nentries;
+ int needsbyteswap;
+ char *dbname = NULL;
+ struct magic_map *map;
+ size_t i;
+
+ fd = -1;
+ if ((map = CAST(struct magic_map *, calloc(1, sizeof(*map)))) == NULL) {
+ file_oomem(ms, sizeof(*map));
+ goto error;
+ }
+
+ dbname = mkdbname(ms, fn, 0);
+ if (dbname == NULL)
+ goto error;
+
+ if ((fd = open(dbname, O_RDONLY|O_BINARY)) == -1)
+ goto error;
+
+ if (fstat(fd, &st) == -1) {
+ file_error(ms, errno, "cannot stat `%s'", dbname);
+ goto error;
+ }
+ if (st.st_size < 8) {
+ file_error(ms, 0, "file `%s' is too small", dbname);
+ goto error;
+ }
+
+ map->len = (size_t)st.st_size;
+#ifdef QUICK
+ if ((map->p = mmap(0, (size_t)st.st_size, PROT_READ|PROT_WRITE,
+ MAP_PRIVATE|MAP_FILE, fd, (off_t)0)) == MAP_FAILED) {
+ file_error(ms, errno, "cannot map `%s'", dbname);
+ goto error;
+ }
+#else
+ if ((map->p = CAST(void *, malloc(map->len))) == NULL) {
+ file_oomem(ms, map->len);
+ goto error;
+ }
+ if (read(fd, map->p, map->len) != (ssize_t)map->len) {
+ file_badread(ms);
+ goto error;
+ }
+ map->len = 0;
+#define RET 1
+#endif
+ (void)close(fd);
+ fd = -1;
+ ptr = CAST(uint32_t *, map->p);
+ if (*ptr != MAGICNO) {
+ if (swap4(*ptr) != MAGICNO) {
+ file_error(ms, 0, "bad magic in `%s'", dbname);
+ goto error;
+ }
+ needsbyteswap = 1;
+ } else
+ needsbyteswap = 0;
+ if (needsbyteswap)
+ version = swap4(ptr[1]);
+ else
+ version = ptr[1];
+ if (version != VERSIONNO) {
+ file_error(ms, 0, "File %s supports only version %d magic "
+ "files. `%s' is version %d", VERSION,
+ VERSIONNO, dbname, version);
+ goto error;
+ }
+ entries = (uint32_t)(st.st_size / sizeof(struct magic));
+ if ((off_t)(entries * sizeof(struct magic)) != st.st_size) {
+ file_error(ms, 0, "Size of `%s' %llu is not a multiple of %zu",
+ dbname, (unsigned long long)st.st_size,
+ sizeof(struct magic));
+ goto error;
+ }
+ map->magic[0] = CAST(struct magic *, map->p) + 1;
+ nentries = 0;
+ for (i = 0; i < MAGIC_SETS; i++) {
+ if (needsbyteswap)
+ map->nmagic[i] = swap4(ptr[i + 2]);
+ else
+ map->nmagic[i] = ptr[i + 2];
+ if (i != MAGIC_SETS - 1)
+ map->magic[i + 1] = map->magic[i] + map->nmagic[i];
+ nentries += map->nmagic[i];
+ }
+ if (entries != nentries + 1) {
+ file_error(ms, 0, "Inconsistent entries in `%s' %u != %u",
+ dbname, entries, nentries + 1);
+ goto error;
+ }
+ if (needsbyteswap)
+ for (i = 0; i < MAGIC_SETS; i++)
+ byteswap(map->magic[i], map->nmagic[i]);
+ free(dbname);
+ return map;
+
+error:
+ if (fd != -1)
+ (void)close(fd);
+ apprentice_unmap(map);
+ free(dbname);
+ return NULL;
+}
+
+private const uint32_t ar[] = {
+ MAGICNO, VERSIONNO
+};
+
+/*
+ * handle an mmaped file.
+ */
+private int
+apprentice_compile(struct magic_set *ms, struct magic_map *map, const char *fn)
+{
+ static const size_t nm = sizeof(*map->nmagic) * MAGIC_SETS;
+ static const size_t m = sizeof(**map->magic);
+ int fd = -1;
+ size_t len;
+ char *dbname;
+ int rv = -1;
+ uint32_t i;
+
+ dbname = mkdbname(ms, fn, 1);
+
+ if (dbname == NULL)
+ goto out;
+
+ if ((fd = open(dbname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644)) == -1)
+ {
+ file_error(ms, errno, "cannot open `%s'", dbname);
+ goto out;
+ }
+
+ if (write(fd, ar, sizeof(ar)) != (ssize_t)sizeof(ar)) {
+ file_error(ms, errno, "error writing `%s'", dbname);
+ goto out;
+ }
+
+ if (write(fd, map->nmagic, nm) != (ssize_t)nm) {
+ file_error(ms, errno, "error writing `%s'", dbname);
+ goto out;
+ }
+
+ assert(nm + sizeof(ar) < m);
+
+ if (lseek(fd, (off_t)m, SEEK_SET) != (off_t)m) {
+ file_error(ms, errno, "error seeking `%s'", dbname);
+ goto out;
+ }
+
+ for (i = 0; i < MAGIC_SETS; i++) {
+ len = m * map->nmagic[i];
+ if (write(fd, map->magic[i], len) != (ssize_t)len) {
+ file_error(ms, errno, "error writing `%s'", dbname);
+ goto out;
+ }
+ }
+
+ if (fd != -1)
+ (void)close(fd);
+ rv = 0;
+out:
+ free(dbname);
+ return rv;
+}
+
+private const char ext[] = ".mgc";
+/*
+ * make a dbname
+ */
+private char *
+mkdbname(struct magic_set *ms, const char *fn, int strip)
+{
+ const char *p, *q;
+ char *buf;
+
+ if (strip) {
+ if ((p = strrchr(fn, '/')) != NULL)
+ fn = ++p;
+ }
+
+ for (q = fn; *q; q++)
+ continue;
+ /* Look for .mgc */
+ for (p = ext + sizeof(ext) - 1; p >= ext && q >= fn; p--, q--)
+ if (*p != *q)
+ break;
+
+ /* Did not find .mgc, restore q */
+ if (p >= ext)
+ while (*q)
+ q++;
+
+ q++;
+ /* Compatibility with old code that looked in .mime */
+ if (ms->flags & MAGIC_MIME) {
+ if (asprintf(&buf, "%.*s.mime%s", (int)(q - fn), fn, ext) < 0)
+ return NULL;
+ if (access(buf, R_OK) != -1) {
+ ms->flags &= MAGIC_MIME_TYPE;
+ return buf;
+ }
+ free(buf);
+ }
+ if (asprintf(&buf, "%.*s%s", (int)(q - fn), fn, ext) < 0)
+ return NULL;
+
+ /* Compatibility with old code that looked in .mime */
+ if (strstr(p, ".mime") != NULL)
+ ms->flags &= MAGIC_MIME_TYPE;
+ return buf;
+}
+
+/*
+ * Byteswap an mmap'ed file if needed
+ */
+private void
+byteswap(struct magic *magic, uint32_t nmagic)
+{
+ uint32_t i;
+ for (i = 0; i < nmagic; i++)
+ bs1(&magic[i]);
+}
+
+/*
+ * swap a short
+ */
+private uint16_t
+swap2(uint16_t sv)
+{
+ uint16_t rv;
+ uint8_t *s = (uint8_t *)(void *)&sv;
+ uint8_t *d = (uint8_t *)(void *)&rv;
+ d[0] = s[1];
+ d[1] = s[0];
+ return rv;
+}
+
+/*
+ * swap an int
+ */
+private uint32_t
+swap4(uint32_t sv)
+{
+ uint32_t rv;
+ uint8_t *s = (uint8_t *)(void *)&sv;
+ uint8_t *d = (uint8_t *)(void *)&rv;
+ d[0] = s[3];
+ d[1] = s[2];
+ d[2] = s[1];
+ d[3] = s[0];
+ return rv;
+}
+
+/*
+ * swap a quad
+ */
+private uint64_t
+swap8(uint64_t sv)
+{
+ uint64_t rv;
+ uint8_t *s = (uint8_t *)(void *)&sv;
+ uint8_t *d = (uint8_t *)(void *)&rv;
+#if 0
+ d[0] = s[3];
+ d[1] = s[2];
+ d[2] = s[1];
+ d[3] = s[0];
+ d[4] = s[7];
+ d[5] = s[6];
+ d[6] = s[5];
+ d[7] = s[4];
+#else
+ d[0] = s[7];
+ d[1] = s[6];
+ d[2] = s[5];
+ d[3] = s[4];
+ d[4] = s[3];
+ d[5] = s[2];
+ d[6] = s[1];
+ d[7] = s[0];
+#endif
+ return rv;
+}
+
+/*
+ * byteswap a single magic entry
+ */
+private void
+bs1(struct magic *m)
+{
+ m->cont_level = swap2(m->cont_level);
+ m->offset = swap4((uint32_t)m->offset);
+ m->in_offset = swap4((uint32_t)m->in_offset);
+ m->lineno = swap4((uint32_t)m->lineno);
+ if (IS_STRING(m->type)) {
+ m->str_range = swap4(m->str_range);
+ m->str_flags = swap4(m->str_flags);
+ }
+ else {
+ m->value.q = swap8(m->value.q);
+ m->num_mask = swap8(m->num_mask);
+ }
+}
+
+protected size_t
+file_pstring_length_size(const struct magic *m)
+{
+ switch (m->str_flags & PSTRING_LEN) {
+ case PSTRING_1_LE:
+ return 1;
+ case PSTRING_2_LE:
+ case PSTRING_2_BE:
+ return 2;
+ case PSTRING_4_LE:
+ case PSTRING_4_BE:
+ return 4;
+ default:
+ abort(); /* Impossible */
+ return 1;
+ }
+}
+protected size_t
+file_pstring_get_length(const struct magic *m, const char *s)
+{
+ size_t len = 0;
+
+ switch (m->str_flags & PSTRING_LEN) {
+ case PSTRING_1_LE:
+ len = *s;
+ break;
+ case PSTRING_2_LE:
+ len = (s[1] << 8) | s[0];
+ break;
+ case PSTRING_2_BE:
+ len = (s[0] << 8) | s[1];
+ break;
+ case PSTRING_4_LE:
+ len = (s[3] << 24) | (s[2] << 16) | (s[1] << 8) | s[0];
+ break;
+ case PSTRING_4_BE:
+ len = (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3];
+ break;
+ default:
+ abort(); /* Impossible */
+ }
+
+ if (m->str_flags & PSTRING_LENGTH_INCLUDES_ITSELF)
+ len -= file_pstring_length_size(m);
+
+ return len;
+}
+
+protected int
+file_magicfind(struct magic_set *ms, const char *name, struct mlist *v)
+{
+ uint32_t i, j;
+ struct mlist *mlist, *ml;
+
+ mlist = ms->mlist[1];
+
+ for (ml = mlist->next; ml != mlist; ml = ml->next) {
+ struct magic *ma = ml->magic;
+ uint32_t nma = ml->nmagic;
+ for (i = 0; i < nma; i++) {
+ if (ma[i].type != FILE_NAME)
+ continue;
+ if (strcmp(ma[i].value.s, name) == 0) {
+ v->magic = &ma[i];
+ for (j = i + 1; j < nma; j++)
+ if (ma[j].cont_level == 0)
+ break;
+ v->nmagic = j - i;
+ return 0;
+ }
+ }
+ }
+ return -1;
+}
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