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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 1.188 2013/01/09 15:36:55 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
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif
#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("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_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;
}
}
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. In either case, it's unsigned.
*/
m->flag |= UNSIGNED;
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);
}
} 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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