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apprentice.c
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apprentice.c
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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 1.193 2013/04/22 15:30:11 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_entry_set {
struct magic_entry *me;
uint32_t count;
uint32_t max;
};
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 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_NONE },
{ 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("clear"), FILE_CLEAR, 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_set *mset)
{
size_t i = me->mp->type == FILE_NAME ? 1 : 0;
if (mset[i].count == mset[i].max) {
struct magic_entry *mp;
mset[i].max += ALLOC_INCR;
if ((mp = CAST(struct magic_entry *,
realloc(mset[i].me, sizeof(*mp) * mset[i].max))) ==
NULL) {
file_oomem(ms, sizeof(*mp) * mset[i].max);
return -1;
}
(void)memset(&mp[mset[i].count], 0, sizeof(*mp) *
ALLOC_INCR);
mset[i].me = mp;
}
mset[i].me[mset[i].count++] = *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_set *mset)
{
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, mset);
goto again;