/
softmagic.c
2126 lines (1938 loc) · 48.7 KB
/
softmagic.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.
*/
/*
* softmagic - interpret variable magic from MAGIC
*/
#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: softmagic.c,v 1.248 2017/04/21 16:54:57 christos Exp $")
#endif /* lint */
#include "magic.h"
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <time.h>
#include "der.h"
#ifndef PREG_OFFSET_CAPTURE
# define PREG_OFFSET_CAPTURE (1<<8)
#endif
private int match(struct magic_set *, struct magic *, uint32_t,
const unsigned char *, size_t, size_t, int, int, int, uint16_t *,
uint16_t *, int *, int *, int *);
private int mget(struct magic_set *, const unsigned char *,
struct magic *, size_t, size_t, unsigned int, int, int, int, uint16_t *,
uint16_t *, int *, int *, int *);
private int magiccheck(struct magic_set *, struct magic *);
private int32_t mprint(struct magic_set *, struct magic *);
private int moffset(struct magic_set *, struct magic *, size_t, int32_t *);
private void mdebug(uint32_t, const char *, size_t);
private int mcopy(struct magic_set *, union VALUETYPE *, int, int,
const unsigned char *, uint32_t, size_t, struct magic *);
private int mconvert(struct magic_set *, struct magic *, int);
private int print_sep(struct magic_set *, int);
private int handle_annotation(struct magic_set *, struct magic *, int);
private int cvt_8(union VALUETYPE *, const struct magic *);
private int cvt_16(union VALUETYPE *, const struct magic *);
private int cvt_32(union VALUETYPE *, const struct magic *);
private int cvt_64(union VALUETYPE *, const struct magic *);
#define OFFSET_OOB(n, o, i) ((n) < (uint32_t)(o) || (i) > ((n) - (o)))
#define BE64(p) (((uint64_t)(p)->hq[0]<<56)|((uint64_t)(p)->hq[1]<<48)| \
((uint64_t)(p)->hq[2]<<40)|((uint64_t)(p)->hq[3]<<32)| \
((uint64_t)(p)->hq[4]<<24)|((uint64_t)(p)->hq[5]<<16)| \
((uint64_t)(p)->hq[6]<<8)|((uint64_t)(p)->hq[7]))
#define LE64(p) (((uint64_t)(p)->hq[7]<<56)|((uint64_t)(p)->hq[6]<<48)| \
((uint64_t)(p)->hq[5]<<40)|((uint64_t)(p)->hq[4]<<32)| \
((uint64_t)(p)->hq[3]<<24)|((uint64_t)(p)->hq[2]<<16)| \
((uint64_t)(p)->hq[1]<<8)|((uint64_t)(p)->hq[0]))
#define LE32(p) (((uint32_t)(p)->hl[3]<<24)|((uint32_t)(p)->hl[2]<<16)| \
((uint32_t)(p)->hl[1]<<8)|((uint32_t)(p)->hl[0]))
#define BE32(p) (((uint32_t)(p)->hl[0]<<24)|((uint32_t)(p)->hl[1]<<16)| \
((uint32_t)(p)->hl[2]<<8)|((uint32_t)(p)->hl[3]))
#define ME32(p) (((uint32_t)(p)->hl[1]<<24)|((uint32_t)(p)->hl[0]<<16)| \
((uint32_t)(p)->hl[3]<<8)|((uint32_t)(p)->hl[2]))
#define BE16(p) (((uint16_t)(p)->hs[0]<<8)|((uint16_t)(p)->hs[1]))
#define LE16(p) (((uint16_t)(p)->hs[1]<<8)|((uint16_t)(p)->hs[0]))
#define SEXT(s,v,p) ((s)?(intmax_t)(int##v##_t)(p):(intmax_t)(uint##v##_t)(p))
/*
* softmagic - lookup one file in parsed, in-memory copy of database
* Passed the name and FILE * of one file to be typed.
*/
/*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
protected int
file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes,
uint16_t *indir_count, uint16_t *name_count, int mode, int text)
{
struct mlist *ml;
int rv, printed_something = 0, need_separator = 0;
uint16_t nc, ic;
if (name_count == NULL) {
nc = 0;
name_count = &nc;
}
if (indir_count == NULL) {
ic = 0;
indir_count = ⁣
}
for (ml = ms->mlist[0]->next; ml != ms->mlist[0]; ml = ml->next)
if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, 0, mode,
text, 0, indir_count, name_count,
&printed_something, &need_separator, NULL)) != 0)
return rv;
return 0;
}
#if defined(FILE_FMTDEBUG) && defined(HAVE_FMTCHECK)
#define F(a, b, c) file_fmtcheck((a), (b), (c), __FILE__, __LINE__)
private const char * __attribute__((__format_arg__(3)))
file_fmtcheck(struct magic_set *ms, const struct magic *m, const char *def,
const char *file, size_t line)
{
const char *ptr = fmtcheck(m->desc, def);
if (ptr == def)
file_magerror(ms,
"%s, %" SIZE_T_FORMAT "u: format `%s' does not match"
" with `%s'", file, line, m->desc, def);
return ptr;
}
#elif defined(HAVE_FMTCHECK)
#define F(a, b, c) fmtcheck((b)->desc, (c))
#else
#define F(a, b, c) ((b)->desc)
#endif
/*
* Go through the whole list, stopping if you find a match. Process all
* the continuations of that match before returning.
*
* We support multi-level continuations:
*
* At any time when processing a successful top-level match, there is a
* current continuation level; it represents the level of the last
* successfully matched continuation.
*
* Continuations above that level are skipped as, if we see one, it
* means that the continuation that controls them - i.e, the
* lower-level continuation preceding them - failed to match.
*
* Continuations below that level are processed as, if we see one,
* it means we've finished processing or skipping higher-level
* continuations under the control of a successful or unsuccessful
* lower-level continuation, and are now seeing the next lower-level
* continuation and should process it. The current continuation
* level reverts to the level of the one we're seeing.
*
* Continuations at the current level are processed as, if we see
* one, there's no lower-level continuation that may have failed.
*
* If a continuation matches, we bump the current continuation level
* so that higher-level continuations are processed.
*/
private int
match(struct magic_set *ms, struct magic *magic, uint32_t nmagic,
const unsigned char *s, size_t nbytes, size_t offset, int mode, int text,
int flip, uint16_t *indir_count, uint16_t *name_count,
int *printed_something, int *need_separator, int *returnval)
{
uint32_t magindex = 0;
unsigned int cont_level = 0;
int returnvalv = 0, e; /* if a match is found it is set to 1*/
int firstline = 1; /* a flag to print X\n X\n- X */
int print = (ms->flags & MAGIC_NODESC) == 0;
if (returnval == NULL)
returnval = &returnvalv;
if (file_check_mem(ms, cont_level) == -1)
return -1;
for (magindex = 0; magindex < nmagic; magindex++) {
int flush = 0;
struct magic *m = &magic[magindex];
if (m->type != FILE_NAME)
if ((IS_LIBMAGIC_STRING(m->type) &&
#define FLT (STRING_BINTEST | STRING_TEXTTEST)
((text && (m->str_flags & FLT) == STRING_BINTEST) ||
(!text && (m->str_flags & FLT) == STRING_TEXTTEST))) ||
(m->flag & mode) != mode) {
flush:
/* Skip sub-tests */
while (magindex < nmagic - 1 &&
magic[magindex + 1].cont_level != 0)
magindex++;
cont_level = 0;
continue; /* Skip to next top-level test*/
}
ms->offset = m->offset;
ms->line = m->lineno;
/* if main entry matches, print it... */
switch (mget(ms, s, m, nbytes, offset, cont_level, mode, text,
flip, indir_count, name_count,
printed_something, need_separator, returnval)) {
case -1:
return -1;
case 0:
flush = m->reln != '!';
break;
default:
if (m->type == FILE_INDIRECT)
*returnval = 1;
switch (magiccheck(ms, m)) {
case -1:
return -1;
case 0:
flush++;
break;
default:
flush = 0;
break;
}
break;
}
if (flush) {
/*
* main entry didn't match,
* flush its continuations
*/
goto flush;
}
if ((e = handle_annotation(ms, m, firstline)) != 0) {
*need_separator = 1;
*printed_something = 1;
*returnval = 1;
return e;
}
/*
* If we are going to print something, we'll need to print
* a blank before we print something else.
*/
if (*m->desc) {
*need_separator = 1;
*printed_something = 1;
if (print_sep(ms, firstline) == -1)
return -1;
}
if (print && mprint(ms, m) == -1)
return -1;
switch (moffset(ms, m, nbytes, &ms->c.li[cont_level].off)) {
case -1:
case 0:
goto flush;
default:
break;
}
/* and any continuations that match */
if (file_check_mem(ms, ++cont_level) == -1)
return -1;
while (magindex + 1 < nmagic &&
magic[magindex + 1].cont_level != 0) {
m = &magic[++magindex];
ms->line = m->lineno; /* for messages */
if (cont_level < m->cont_level)
continue;
if (cont_level > m->cont_level) {
/*
* We're at the end of the level
* "cont_level" continuations.
*/
cont_level = m->cont_level;
}
ms->offset = m->offset;
if (m->flag & OFFADD) {
ms->offset +=
ms->c.li[cont_level - 1].off;
}
#ifdef ENABLE_CONDITIONALS
if (m->cond == COND_ELSE ||
m->cond == COND_ELIF) {
if (ms->c.li[cont_level].last_match == 1)
continue;
}
#endif
switch (mget(ms, s, m, nbytes, offset, cont_level, mode,
text, flip, indir_count, name_count,
printed_something, need_separator, returnval)) {
case -1:
return -1;
case 0:
if (m->reln != '!')
continue;
flush = 1;
break;
default:
if (m->type == FILE_INDIRECT)
*returnval = 1;
flush = 0;
break;
}
switch (flush ? 1 : magiccheck(ms, m)) {
case -1:
return -1;
case 0:
#ifdef ENABLE_CONDITIONALS
ms->c.li[cont_level].last_match = 0;
#endif
break;
default:
#ifdef ENABLE_CONDITIONALS
ms->c.li[cont_level].last_match = 1;
#endif
if (m->type == FILE_CLEAR)
ms->c.li[cont_level].got_match = 0;
else if (ms->c.li[cont_level].got_match) {
if (m->type == FILE_DEFAULT)
break;
} else
ms->c.li[cont_level].got_match = 1;
if ((e = handle_annotation(ms, m, firstline)) != 0) {
*need_separator = 1;
*printed_something = 1;
*returnval = 1;
return e;
}
/*
* If we are going to print something,
* make sure that we have a separator first.
*/
if (*m->desc) {
if (!*printed_something) {
*printed_something = 1;
if (print_sep(ms, firstline)
== -1)
return -1;
}
}
/*
* This continuation matched. Print
* its message, with a blank before it
* if the previous item printed and
* this item isn't empty.
*/
/* space if previous printed */
if (*need_separator
&& ((m->flag & NOSPACE) == 0)
&& *m->desc) {
if (print &&
file_printf(ms, " ") == -1)
return -1;
*need_separator = 0;
}
if (print && mprint(ms, m) == -1)
return -1;
switch (moffset(ms, m, nbytes,
&ms->c.li[cont_level].off)) {
case -1:
case 0:
flush = 1;
cont_level--;
break;
default:
break;
}
if (*m->desc)
*need_separator = 1;
/*
* If we see any continuations
* at a higher level,
* process them.
*/
if (file_check_mem(ms, ++cont_level) == -1)
return -1;
break;
}
}
if (*printed_something) {
firstline = 0;
if (print)
*returnval = 1;
}
if ((ms->flags & MAGIC_CONTINUE) == 0 && *printed_something) {
return *returnval; /* don't keep searching */
}
cont_level = 0;
}
return *returnval; /* This is hit if -k is set or there is no match */
}
private int
check_fmt(struct magic_set *ms, struct magic *m)
{
pcre2_code *pce;
uint32_t re_options, capture_count;
int rv = -1;
zend_string *pattern;
if (strchr(m->desc, '%') == NULL)
return 0;
(void)setlocale(LC_CTYPE, "C");
pattern = zend_string_init("~%[-0-9.]*s~", sizeof("~%[-0-9.]*s~") - 1, 0);
if ((pce = pcre_get_compiled_regex(pattern, &capture_count, &re_options)) == NULL) {
rv = -1;
} else {
pcre2_match_data *match_data = php_pcre_create_match_data(capture_count, pce);
if (match_data) {
rv = pcre2_match(pce, m->desc, strlen(m->desc), 0, re_options, match_data, php_pcre_mctx()) > 0;
php_pcre_free_match_data(match_data);
}
}
zend_string_release(pattern);
(void)setlocale(LC_CTYPE, "");
return rv;
}
private int32_t
mprint(struct magic_set *ms, struct magic *m)
{
uint64_t v;
float vf;
double vd;
int64_t t = 0;
char buf[128], tbuf[26], sbuf[512];
union VALUETYPE *p = &ms->ms_value;
switch (m->type) {
case FILE_BYTE:
v = file_signextend(ms, m, (uint64_t)p->b);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%d",
(unsigned char)v);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%d"),
(unsigned char) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(char);
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
v = file_signextend(ms, m, (uint64_t)p->h);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%u",
(unsigned short)v);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%u"),
(unsigned short) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(short);
break;
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
v = file_signextend(ms, m, (uint64_t)p->l);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%u", (uint32_t) v);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%u"), (uint32_t) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(int32_t);
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
v = file_signextend(ms, m, p->q);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%" INT64_T_FORMAT "u",
(unsigned long long)v);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%" INT64_T_FORMAT "u"),
(unsigned long long) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(int64_t);
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->reln == '=' || m->reln == '!') {
if (file_printf(ms, F(ms, m, "%s"),
file_printable(sbuf, sizeof(sbuf), m->value.s))
== -1)
return -1;
t = ms->offset + m->vallen;
}
else {
char *str = p->s;
/* compute t before we mangle the string? */
t = ms->offset + strlen(str);
if (*m->value.s == '\0')
str[strcspn(str, "\r\n")] = '\0';
if (m->str_flags & STRING_TRIM) {
char *last;
while (isspace((unsigned char)*str))
str++;
last = str;
while (*last)
last++;
--last;
while (isspace((unsigned char)*last))
last--;
*++last = '\0';
}
if (file_printf(ms, F(ms, m, "%s"),
file_printable(sbuf, sizeof(sbuf), str)) == -1)
return -1;
if (m->type == FILE_PSTRING)
t += file_pstring_length_size(m);
}
break;
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
if (file_printf(ms, F(ms, m, "%s"),
file_fmttime(p->l, 0, tbuf)) == -1)
return -1;
t = ms->offset + sizeof(uint32_t);
break;
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
if (file_printf(ms, F(ms, m, "%s"),
file_fmttime(p->l, FILE_T_LOCAL, tbuf)) == -1)
return -1;
t = ms->offset + sizeof(uint32_t);
break;
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
if (file_printf(ms, F(ms, m, "%s"),
file_fmttime(p->q, 0, tbuf)) == -1)
return -1;
t = ms->offset + sizeof(uint64_t);
break;
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
if (file_printf(ms, F(ms, m, "%s"),
file_fmttime(p->q, FILE_T_LOCAL, tbuf)) == -1)
return -1;
t = ms->offset + sizeof(uint64_t);
break;
case FILE_QWDATE:
case FILE_BEQWDATE:
case FILE_LEQWDATE:
if (file_printf(ms, F(ms, m, "%s"),
file_fmttime(p->q, FILE_T_WINDOWS, tbuf)) == -1)
return -1;
t = ms->offset + sizeof(uint64_t);
break;
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
vf = p->f;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%g", vf);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%g"), vf) == -1)
return -1;
break;
}
t = ms->offset + sizeof(float);
break;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
vd = p->d;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
(void)snprintf(buf, sizeof(buf), "%g", vd);
if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
return -1;
break;
default:
if (file_printf(ms, F(ms, m, "%g"), vd) == -1)
return -1;
break;
}
t = ms->offset + sizeof(double);
break;
case FILE_REGEX: {
char *cp;
int rval;
cp = estrndup((const char *)ms->search.s, ms->search.rm_len);
if (cp == NULL) {
file_oomem(ms, ms->search.rm_len);
return -1;
}
rval = file_printf(ms, F(ms, m, "%s"),
file_printable(sbuf, sizeof(sbuf), cp));
efree(cp);
if (rval == -1)
return -1;
if ((m->str_flags & REGEX_OFFSET_START))
t = ms->search.offset;
else
t = ms->search.offset + ms->search.rm_len;
break;
}
case FILE_SEARCH:
if (file_printf(ms, F(ms, m, "%s"), m->value.s) == -1)
return -1;
if ((m->str_flags & REGEX_OFFSET_START))
t = ms->search.offset;
else
t = ms->search.offset + m->vallen;
break;
case FILE_DEFAULT:
case FILE_CLEAR:
if (file_printf(ms, "%s", m->desc) == -1)
return -1;
t = ms->offset;
break;
case FILE_INDIRECT:
case FILE_USE:
case FILE_NAME:
t = ms->offset;
break;
case FILE_DER:
if (file_printf(ms, F(ms, m, "%s"),
file_printable(sbuf, sizeof(sbuf), ms->ms_value.s)) == -1)
return -1;
t = ms->offset;
break;
default:
file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
return -1;
}
return (int32_t)t;
}
private int
moffset(struct magic_set *ms, struct magic *m, size_t nbytes, int32_t *op)
{
int32_t o;
switch (m->type) {
case FILE_BYTE:
o = CAST(int32_t, (ms->offset + sizeof(char)));
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
o = CAST(int32_t, (ms->offset + sizeof(short)));
break;
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
o = CAST(int32_t, (ms->offset + sizeof(int32_t)));
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
o = CAST(int32_t, (ms->offset + sizeof(int64_t)));
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->reln == '=' || m->reln == '!') {
o = ms->offset + m->vallen;
} else {
union VALUETYPE *p = &ms->ms_value;
if (*m->value.s == '\0')
p->s[strcspn(p->s, "\r\n")] = '\0';
o = CAST(uint32_t, (ms->offset + strlen(p->s)));
if (m->type == FILE_PSTRING)
o += (uint32_t)file_pstring_length_size(m);
}
break;
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
break;
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
break;
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
break;
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
break;
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
o = CAST(int32_t, (ms->offset + sizeof(float)));
break;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
o = CAST(int32_t, (ms->offset + sizeof(double)));
break;
case FILE_REGEX:
if ((m->str_flags & REGEX_OFFSET_START) != 0)
o = CAST(int32_t, ms->search.offset);
else
o = CAST(int32_t,
(ms->search.offset + ms->search.rm_len));
break;
case FILE_SEARCH:
if ((m->str_flags & REGEX_OFFSET_START) != 0)
o = CAST(int32_t, ms->search.offset);
else
o = CAST(int32_t, (ms->search.offset + m->vallen));
break;
case FILE_CLEAR:
case FILE_DEFAULT:
case FILE_INDIRECT:
o = ms->offset;
break;
case FILE_DER:
{
o = der_offs(ms, m, nbytes);
if (o == -1 || (size_t)o > nbytes) {
if ((ms->flags & MAGIC_DEBUG) != 0) {
(void)fprintf(stderr,
"Bad DER offset %d nbytes=%zu",
o, nbytes);
}
*op = 0;
return 0;
}
break;
}
default:
o = 0;
break;
}
if ((size_t)o > nbytes) {
#if 0
file_error(ms, 0, "Offset out of range %zu > %zu",
(size_t)o, nbytes);
#endif
return -1;
}
*op = o;
return 1;
}
private uint32_t
cvt_id3(struct magic_set *ms, uint32_t v)
{
v = ((((v >> 0) & 0x7f) << 0) |
(((v >> 8) & 0x7f) << 7) |
(((v >> 16) & 0x7f) << 14) |
(((v >> 24) & 0x7f) << 21));
if ((ms->flags & MAGIC_DEBUG) != 0)
fprintf(stderr, "id3 offs=%u\n", v);
return v;
}
private int
cvt_flip(int type, int flip)
{
if (flip == 0)
return type;
switch (type) {
case FILE_BESHORT:
return FILE_LESHORT;
case FILE_BELONG:
return FILE_LELONG;
case FILE_BEDATE:
return FILE_LEDATE;
case FILE_BELDATE:
return FILE_LELDATE;
case FILE_BEQUAD:
return FILE_LEQUAD;
case FILE_BEQDATE:
return FILE_LEQDATE;
case FILE_BEQLDATE:
return FILE_LEQLDATE;
case FILE_BEQWDATE:
return FILE_LEQWDATE;
case FILE_LESHORT:
return FILE_BESHORT;
case FILE_LELONG:
return FILE_BELONG;
case FILE_LEDATE:
return FILE_BEDATE;
case FILE_LELDATE:
return FILE_BELDATE;
case FILE_LEQUAD:
return FILE_BEQUAD;
case FILE_LEQDATE:
return FILE_BEQDATE;
case FILE_LEQLDATE:
return FILE_BEQLDATE;
case FILE_LEQWDATE:
return FILE_BEQWDATE;
case FILE_BEFLOAT:
return FILE_LEFLOAT;
case FILE_LEFLOAT:
return FILE_BEFLOAT;
case FILE_BEDOUBLE:
return FILE_LEDOUBLE;
case FILE_LEDOUBLE:
return FILE_BEDOUBLE;
default:
return type;
}
}
#define DO_CVT(fld, cast) \
if (m->num_mask) \
switch (m->mask_op & FILE_OPS_MASK) { \
case FILE_OPAND: \
p->fld &= cast m->num_mask; \
break; \
case FILE_OPOR: \
p->fld |= cast m->num_mask; \
break; \
case FILE_OPXOR: \
p->fld ^= cast m->num_mask; \
break; \
case FILE_OPADD: \
p->fld += cast m->num_mask; \
break; \
case FILE_OPMINUS: \
p->fld -= cast m->num_mask; \
break; \
case FILE_OPMULTIPLY: \
p->fld *= cast m->num_mask; \
break; \
case FILE_OPDIVIDE: \
if (cast m->num_mask == 0) \
return -1; \
p->fld /= cast m->num_mask; \
break; \
case FILE_OPMODULO: \
if (cast m->num_mask == 0) \
return -1; \
p->fld %= cast m->num_mask; \
break; \
} \
if (m->mask_op & FILE_OPINVERSE) \
p->fld = ~p->fld \
private int
cvt_8(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(b, (uint8_t));
return 0;
}
private int
cvt_16(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(h, (uint16_t));
return 0;
}
private int
cvt_32(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(l, (uint32_t));
return 0;
}
private int
cvt_64(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(q, (uint64_t));
return 0;
}
#define DO_CVT2(fld, cast) \
if (m->num_mask) \
switch (m->mask_op & FILE_OPS_MASK) { \
case FILE_OPADD: \
p->fld += cast m->num_mask; \
break; \
case FILE_OPMINUS: \
p->fld -= cast m->num_mask; \
break; \
case FILE_OPMULTIPLY: \
p->fld *= cast m->num_mask; \
break; \
case FILE_OPDIVIDE: \
if (cast m->num_mask == 0) \
return -1; \
p->fld /= cast m->num_mask; \
break; \
} \