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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 1.147 2011/11/05 15:44:22 rrt Exp $")
#endif /* lint */
#include "magic.h"
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <time.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, int, int);
private int mget(struct magic_set *, const unsigned char *,
struct magic *, size_t, unsigned int, int);
private int magiccheck(struct magic_set *, struct magic *);
private int32_t mprint(struct magic_set *, struct magic *);
private int32_t moffset(struct magic_set *, struct magic *);
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, size_t);
private int mconvert(struct magic_set *, struct magic *);
private int print_sep(struct magic_set *, int);
private int handle_annotation(struct magic_set *, struct magic *);
private void cvt_8(union VALUETYPE *, const struct magic *);
private void cvt_16(union VALUETYPE *, const struct magic *);
private void cvt_32(union VALUETYPE *, const struct magic *);
private void cvt_64(union VALUETYPE *, const struct magic *);
/*
* 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,
int mode, int text)
{
struct mlist *ml;
int rv;
for (ml = ms->mlist->next; ml != ms->mlist; ml = ml->next)
if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, mode,
text)) != 0)
return rv;
return 0;
}
/*
* 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, int mode, int text)
{
uint32_t magindex = 0;
unsigned int cont_level = 0;
int need_separator = 0;
int returnval = 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 printed_something = 0;
int print = (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0;
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 ((IS_LIBMAGIC_STRING(m->type) &&
((text && (m->str_flags & (STRING_BINTEST | STRING_TEXTTEST)) == STRING_BINTEST) ||
(!text && (m->str_flags & (STRING_TEXTTEST | STRING_BINTEST)) == STRING_TEXTTEST))) ||
(m->flag & mode) != mode) {
/* Skip sub-tests */
while (magindex < nmagic - 1 && magic[magindex + 1].cont_level != 0) {
magindex++;
}
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, cont_level, text)) {
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
*/
while (magindex < nmagic - 1 && magic[magindex + 1].cont_level != 0) {
magindex++;
}
continue;
}
if ((e = handle_annotation(ms, m)) != 0)
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;
ms->c.li[cont_level].off = moffset(ms, m);
/* and any continuations that match */
if (file_check_mem(ms, ++cont_level) == -1)
return -1;
while (magindex < nmagic - 1 && magic[magindex + 1].cont_level != 0) {
magindex++;
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, cont_level, text)) {
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_DEFAULT)
ms->c.li[cont_level].got_match = 1;
else if (ms->c.li[cont_level].got_match) {
ms->c.li[cont_level].got_match = 0;
break;
}
if ((e = handle_annotation(ms, m)) != 0)
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;
ms->c.li[cont_level].off = moffset(ms, m);
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 */
}
}
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)
{
pcre *pce;
int re_options;
pcre_extra *re_extra;
TSRMLS_FETCH();
if (strchr(m->desc, '%') == NULL) {
return 0;
}
if ((pce = pcre_get_compiled_regex("~%[-0-9.]*s~", &re_extra, &re_options TSRMLS_CC)) == NULL) {
return -1;
} else {
return !pcre_exec(pce, re_extra, m->desc, strlen(m->desc), 0, re_options, NULL, 0);
}
}
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];
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), "%c",
(unsigned char)v);
if (file_printf(ms, m->desc, buf) == -1)
return -1;
break;
default:
if (file_printf(ms, m->desc, (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), "%hu",
(unsigned short)v);
if (file_printf(ms, m->desc, buf) == -1)
return -1;
break;
default:
if (
file_printf(ms, m->desc, (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, m->desc, buf) == -1)
return -1;
break;
default:
if (file_printf(ms, m->desc, (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);
if (file_printf(ms, m->desc, (uint64_t) v) == -1)
return -1;
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, m->desc, m->value.s) == -1)
return -1;
t = ms->offset + m->vallen;
}
else {
if (*m->value.s == '\0')
p->s[strcspn(p->s, "\n")] = '\0';
if (file_printf(ms, m->desc, p->s) == -1)
return -1;
t = ms->offset + strlen(p->s);
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, m->desc, file_fmttime(p->l, 1)) == -1)
return -1;
t = ms->offset + sizeof(time_t);
break;
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
if (file_printf(ms, m->desc, file_fmttime(p->l, 0)) == -1)
return -1;
t = ms->offset + sizeof(time_t);
break;
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
if (file_printf(ms, m->desc, file_fmttime((uint32_t)p->q,
1)) == -1)
return -1;
t = ms->offset + sizeof(uint64_t);
break;
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
if (file_printf(ms, m->desc, file_fmttime((uint32_t)p->q,
0)) == -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, m->desc, buf) == -1)
return -1;
break;
default:
if (file_printf(ms, m->desc, 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, m->desc, buf) == -1)
return -1;
break;
default:
if (file_printf(ms, m->desc, 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);
rval = file_printf(ms, m->desc, 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, m->desc, 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:
if (file_printf(ms, m->desc, m->value.s) == -1)
return -1;
t = ms->offset;
break;
case FILE_INDIRECT:
t = ms->offset;
break;
default:
file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
return -1;
}
return (int32_t)t;
}
private int32_t
moffset(struct magic_set *ms, struct magic *m)
{
switch (m->type) {
case FILE_BYTE:
return CAST(int32_t, (ms->offset + sizeof(char)));
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
return CAST(int32_t, (ms->offset + sizeof(short)));
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
return CAST(int32_t, (ms->offset + sizeof(int32_t)));
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
return CAST(int32_t, (ms->offset + sizeof(int64_t)));
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->reln == '=' || m->reln == '!')
return ms->offset + m->vallen;
else {
union VALUETYPE *p = &ms->ms_value;
uint32_t t;
if (*m->value.s == '\0')
p->s[strcspn(p->s, "\n")] = '\0';
t = CAST(uint32_t, (ms->offset + strlen(p->s)));
if (m->type == FILE_PSTRING)
t += file_pstring_length_size(m);
return t;
}
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
return CAST(int32_t, (ms->offset + sizeof(time_t)));
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
return CAST(int32_t, (ms->offset + sizeof(time_t)));
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
return CAST(int32_t, (ms->offset + sizeof(uint64_t)));
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
return CAST(int32_t, (ms->offset + sizeof(uint64_t)));
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
return CAST(int32_t, (ms->offset + sizeof(float)));
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
return CAST(int32_t, (ms->offset + sizeof(double)));
case FILE_REGEX:
if ((m->str_flags & REGEX_OFFSET_START) != 0)
return CAST(int32_t, ms->search.offset);
else
return CAST(int32_t, (ms->search.offset +
ms->search.rm_len));
case FILE_SEARCH:
if ((m->str_flags & REGEX_OFFSET_START) != 0)
return CAST(int32_t, ms->search.offset);
else
return CAST(int32_t, (ms->search.offset + m->vallen));
case FILE_DEFAULT:
return ms->offset;
case FILE_INDIRECT:
return ms->offset;
default:
return 0;
}
}
#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: \
p->fld /= cast m->num_mask; \
break; \
case FILE_OPMODULO: \
p->fld %= cast m->num_mask; \
break; \
} \
if (m->mask_op & FILE_OPINVERSE) \
p->fld = ~p->fld \
private void
cvt_8(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(b, (uint8_t));
}
private void
cvt_16(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(h, (uint16_t));
}
private void
cvt_32(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(l, (uint32_t));
}
private void
cvt_64(union VALUETYPE *p, const struct magic *m)
{
DO_CVT(q, (uint64_t));
}
#define DO_CVT2(fld, cast) \
if (m->num_mask) \
switch (m->mask_op & FILE_OPS_MASK) { \
case FILE_OPADD: \
p->fld += cast (int64_t)m->num_mask; \
break; \
case FILE_OPMINUS: \
p->fld -= cast (int64_t)m->num_mask; \
break; \
case FILE_OPMULTIPLY: \
p->fld *= cast (int64_t)m->num_mask; \
break; \
case FILE_OPDIVIDE: \
p->fld /= cast (int64_t)m->num_mask; \
break; \
} \
private void
cvt_float(union VALUETYPE *p, const struct magic *m)
{
DO_CVT2(f, (float));
}
private void
cvt_double(union VALUETYPE *p, const struct magic *m)
{
DO_CVT2(d, (double));
}
/*
* Convert the byte order of the data we are looking at
* While we're here, let's apply the mask operation
* (unless you have a better idea)
*/
private int
mconvert(struct magic_set *ms, struct magic *m)
{
union VALUETYPE *p = &ms->ms_value;
switch (m->type) {
case FILE_BYTE:
cvt_8(p, m);
return 1;
case FILE_SHORT:
cvt_16(p, m);
return 1;
case FILE_LONG:
case FILE_DATE:
case FILE_LDATE:
cvt_32(p, m);
return 1;
case FILE_QUAD:
case FILE_QDATE:
case FILE_QLDATE:
cvt_64(p, m);
return 1;
case FILE_STRING:
case FILE_BESTRING16:
case FILE_LESTRING16: {
/* Null terminate and eat *trailing* return */
p->s[sizeof(p->s) - 1] = '\0';
return 1;
}
case FILE_PSTRING: {
char *ptr1 = p->s, *ptr2 = ptr1 + file_pstring_length_size(m);
size_t len = file_pstring_get_length(m, ptr1);
if (len >= sizeof(p->s))
len = sizeof(p->s) - 1;
while (len--)
*ptr1++ = *ptr2++;
*ptr1 = '\0';
return 1;
}
case FILE_BESHORT:
p->h = (short)((p->hs[0]<<8)|(p->hs[1]));
cvt_16(p, m);
return 1;
case FILE_BELONG:
case FILE_BEDATE:
case FILE_BELDATE:
p->l = (int32_t)
((p->hl[0]<<24)|(p->hl[1]<<16)|(p->hl[2]<<8)|(p->hl[3]));
cvt_32(p, m);
return 1;
case FILE_BEQUAD:
case FILE_BEQDATE:
case FILE_BEQLDATE:
p->q = (uint64_t)
(((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]));
cvt_64(p, m);
return 1;
case FILE_LESHORT:
p->h = (short)((p->hs[1]<<8)|(p->hs[0]));
cvt_16(p, m);
return 1;
case FILE_LELONG:
case FILE_LEDATE:
case FILE_LELDATE:
p->l = (int32_t)
((p->hl[3]<<24)|(p->hl[2]<<16)|(p->hl[1]<<8)|(p->hl[0]));
cvt_32(p, m);
return 1;
case FILE_LEQUAD:
case FILE_LEQDATE:
case FILE_LEQLDATE:
p->q = (uint64_t)
(((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]));
cvt_64(p, m);
return 1;
case FILE_MELONG:
case FILE_MEDATE:
case FILE_MELDATE:
p->l = (int32_t)
((p->hl[1]<<24)|(p->hl[0]<<16)|(p->hl[3]<<8)|(p->hl[2]));
cvt_32(p, m);
return 1;
case FILE_FLOAT:
cvt_float(p, m);
return 1;
case FILE_BEFLOAT:
p->l = ((uint32_t)p->hl[0]<<24)|((uint32_t)p->hl[1]<<16)|
((uint32_t)p->hl[2]<<8) |((uint32_t)p->hl[3]);
cvt_float(p, m);
return 1;
case FILE_LEFLOAT:
p->l = ((uint32_t)p->hl[3]<<24)|((uint32_t)p->hl[2]<<16)|
((uint32_t)p->hl[1]<<8) |((uint32_t)p->hl[0]);
cvt_float(p, m);
return 1;
case FILE_DOUBLE:
cvt_double(p, m);
return 1;
case FILE_BEDOUBLE:
p->q = ((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]);
cvt_double(p, m);
return 1;
case FILE_LEDOUBLE:
p->q = ((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]);
cvt_double(p, m);
return 1;
case FILE_REGEX:
case FILE_SEARCH:
case FILE_DEFAULT:
return 1;
default:
file_magerror(ms, "invalid type %d in mconvert()", m->type);
return 0;
}
}
private void
mdebug(uint32_t offset, const char *str, size_t len)
{
(void) fprintf(stderr, "mget @%d: ", offset);
file_showstr(stderr, str, len);
(void) fputc('\n', stderr);
(void) fputc('\n', stderr);
}
private int
mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir,
const unsigned char *s, uint32_t offset, size_t nbytes, size_t linecnt)
{
/*
* Note: FILE_SEARCH and FILE_REGEX do not actually copy
* anything, but setup pointers into the source
*/
if (indir == 0) {
switch (type) {
case FILE_SEARCH:
ms->search.s = RCAST(const char *, s) + offset;
ms->search.s_len = nbytes - offset;
ms->search.offset = offset;
return 0;
case FILE_REGEX: {
const char *b;
const char *c;
const char *last; /* end of search region */
const char *buf; /* start of search region */
const char *end;
size_t lines;
if (s == NULL) {
ms->search.s_len = 0;
ms->search.s = NULL;
return 0;
}
buf = RCAST(const char *, s) + offset;
end = last = RCAST(const char *, s) + nbytes;
/* mget() guarantees buf <= last */
for (lines = linecnt, b = buf; lines && b < end &&
((b = CAST(const char *,
memchr(c = b, '\n', CAST(size_t, (end - b)))))
|| (b = CAST(const char *,
memchr(c, '\r', CAST(size_t, (end - c))))));
lines--, b++) {
last = b;
if (b[0] == '\r' && b[1] == '\n')
b++;
}
if (lines)
last = RCAST(const char *, s) + nbytes;
ms->search.s = buf;
ms->search.s_len = last - buf;
ms->search.offset = offset;
ms->search.rm_len = 0;
return 0;
}
case FILE_BESTRING16:
case FILE_LESTRING16: {
const unsigned char *src = s + offset;
const unsigned char *esrc = s + nbytes;
char *dst = p->s;
char *edst = &p->s[sizeof(p->s) - 1];
if (type == FILE_BESTRING16)
src++;
/* check for pointer overflow */
if (src < s) {
file_magerror(ms, "invalid offset %u in mcopy()",
offset);
return -1;
}
for (/*EMPTY*/; src < esrc; src += 2, dst++) {
if (dst < edst)
*dst = *src;
else
break;
if (*dst == '\0') {
if (type == FILE_BESTRING16 ?
*(src - 1) != '\0' :
*(src + 1) != '\0')
*dst = ' ';
}
}
*edst = '\0';
return 0;
}
case FILE_STRING: /* XXX - these two should not need */
case FILE_PSTRING: /* to copy anything, but do anyway. */
default:
break;
}
}
if (offset >= nbytes) {
(void)memset(p, '\0', sizeof(*p));
return 0;
}
if (nbytes - offset < sizeof(*p))
nbytes = nbytes - offset;
else
nbytes = sizeof(*p);
(void)memcpy(p, s + offset, nbytes);
/*
* the usefulness of padding with zeroes eludes me, it
* might even cause problems
*/
if (nbytes < sizeof(*p))
(void)memset(((char *)(void *)p) + nbytes, '\0',
sizeof(*p) - nbytes);
return 0;
}
private int
mget(struct magic_set *ms, const unsigned char *s,
struct magic *m, size_t nbytes, unsigned int cont_level, int text)