githubmirror/file

src/softmagic.c
2 262 строки50 KB
Christos Zoulas
Don't make exceeding magic offsets an error; just fail this magic entry test.
21 апр 2016, 18:23
21 апр 2016, 18:233ca1d7b
/*
 * 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 1.230 2016/04/18 15:10:34 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"

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 *);
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) < (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]))

/*
 * 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 = &ic;
	}

	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;
}

#define FILE_FMTDEBUG
#ifdef FILE_FMTDEBUG
#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;
}
#else
#define F(a, b, c) fmtcheck((b)->desc, (c))
#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_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++;
			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)) != 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)) != 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;
					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)
{
	file_regex_t rx;
	int rc, rv = -1;

	if (strchr(m->desc, '%') == NULL)
		return 0;

	rc = file_regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB);
	if (rc) {
		file_regerror(&rx, rc, ms);
	} else {
		rc = file_regexec(&rx, m->desc, 0, 0, 0);
		rv = !rc;
	}
	file_regfree(&rx);
	return rv;
}

#ifndef HAVE_STRNDUP
char * strndup(const char *, size_t);

char *
strndup(const char *str, size_t n)
{
	size_t len;
	char *copy;

	for (len = 0; len < n && str[len]; len++)
		continue;
	if ((copy = malloc(len + 1)) == NULL)
		return NULL;
	(void)memcpy(copy, str, len);
	copy[len] = '\0';
	return copy;
}
#endif /* HAVE_STRNDUP */

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_SEARCH:
	case FILE_REGEX: {
		char *cp;
		int rval;

		cp = strndup((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));
		free(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_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);
				}
				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; \
		} \

private int
cvt_float(union VALUETYPE *p, const struct magic *m)
{
	DO_CVT2(f, (float));
	return 0;
}

private int
cvt_double(union VALUETYPE *p, const struct magic *m)
{
	DO_CVT2(d, (double));
	return 0;
}

/*
 * 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, int flip)
{
	union VALUETYPE *p = &ms->ms_value;
	uint8_t type;

	switch (type = cvt_flip(m->type, flip)) {
	case FILE_BYTE:
		if (cvt_8(p, m) == -1)
			goto out;
		return 1;
	case FILE_SHORT:
		if (cvt_16(p, m) == -1)
			goto out;
		return 1;
	case FILE_LONG:
	case FILE_DATE:
	case FILE_LDATE:
		if (cvt_32(p, m) == -1)
			goto out;
		return 1;
	case FILE_QUAD:
	case FILE_QDATE:
	case FILE_QLDATE:
	case FILE_QWDATE:
		if (cvt_64(p, m) == -1)
			goto out;
		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: {
		size_t sz = file_pstring_length_size(m);
		char *ptr1 = p->s, *ptr2 = ptr1 + sz;
		size_t len = file_pstring_get_length(m, ptr1);
		sz = sizeof(p->s) - sz; /* maximum length of string */
		if (len >= sz) {
			/*
			 * The size of the pascal string length (sz)
			 * is 1, 2, or 4. We need at least 1 byte for NUL
			 * termination, but we've already truncated the
			 * string by p->s, so we need to deduct sz.
			 * Because we can use one of the bytes of the length
			 * after we shifted as NUL termination.
			 */ 
			len = sz;
		}
		while (len--)
			*ptr1++ = *ptr2++;
		*ptr1 = '\0';
		return 1;
	}
	case FILE_BESHORT:
		p->h = (short)BE16(p);
		if (cvt_16(p, m) == -1)
			goto out;
		return 1;
	case FILE_BELONG:
	case FILE_BEDATE:
	case FILE_BELDATE:
		p->l = (int32_t)BE32(p);
		if (cvt_32(p, m) == -1)
			goto out;
		return 1;
	case FILE_BEQUAD:
	case FILE_BEQDATE:
	case FILE_BEQLDATE:
	case FILE_BEQWDATE:
		p->q = (uint64_t)BE64(p);
		if (cvt_64(p, m) == -1)
			goto out;
		return 1;
	case FILE_LESHORT:
		p->h = (short)LE16(p);
		if (cvt_16(p, m) == -1)
			goto out;
		return 1;
	case FILE_LELONG:
	case FILE_LEDATE:
	case FILE_LELDATE:
		p->l = (int32_t)LE32(p);
		if (cvt_32(p, m) == -1)
			goto out;
		return 1;
	case FILE_LEQUAD:
	case FILE_LEQDATE:
	case FILE_LEQLDATE:
	case FILE_LEQWDATE:
		p->q = (uint64_t)LE64(p);
		if (cvt_64(p, m) == -1)
			goto out;
		return 1;
	case FILE_MELONG:
	case FILE_MEDATE:
	case FILE_MELDATE:
		p->l = (int32_t)ME32(p);
		if (cvt_32(p, m) == -1)
			goto out;
		return 1;
	case FILE_FLOAT:
		if (cvt_float(p, m) == -1)
			goto out;
		return 1;
	case FILE_BEFLOAT:
		p->l = BE32(p);
		if (cvt_float(p, m) == -1)
			goto out;
		return 1;
	case FILE_LEFLOAT:
		p->l = LE32(p);
		if (cvt_float(p, m) == -1)
			goto out;
		return 1;
	case FILE_DOUBLE:
		if (cvt_double(p, m) == -1)
			goto out;
		return 1;
	case FILE_BEDOUBLE:
		p->q = BE64(p); 
		if (cvt_double(p, m) == -1)
			goto out;
		return 1;
	case FILE_LEDOUBLE:
		p->q = LE64(p);
		if (cvt_double(p, m) == -1)
			goto out;
		return 1;
	case FILE_REGEX:
	case FILE_SEARCH:
	case FILE_DEFAULT:
	case FILE_CLEAR:
	case FILE_NAME:
	case FILE_USE:
	case FILE_DER:
		return 1;
	default:
		file_magerror(ms, "invalid type %d in mconvert()", m->type);
		return 0;
	}
out:
	file_magerror(ms, "zerodivide in mconvert()");
	return 0;
}


private void
mdebug(uint32_t offset, const char *str, size_t len)
{
	(void) fprintf(stderr, "mget/%" SIZE_T_FORMAT "u @%d: ", len, 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, struct magic *m)
{
	/*
	 * Note: FILE_SEARCH and FILE_REGEX do not actually copy
	 * anything, but setup pointers into the source
	 */
	if (indir == 0) {
		switch (type) {
		case FILE_DER:
		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, linecnt, bytecnt;

			if (s == NULL) {
				ms->search.s_len = 0;
				ms->search.s = NULL;
				return 0;
			}

			if (m->str_flags & REGEX_LINE_COUNT) {
				linecnt = m->str_range;
				bytecnt = linecnt * 80;
			} else {
				linecnt = 0;
				bytecnt = m->str_range;
			}

			if (bytecnt == 0 || bytecnt > nbytes - offset)
				bytecnt = nbytes - offset;
			if (bytecnt > ms->regex_max)
				bytecnt = ms->regex_max;

			buf = RCAST(const char *, s) + offset;
			end = last = RCAST(const char *, s) + bytecnt + offset;
			/* 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) + bytecnt;

			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 that offset is within range */
			if (offset >= nbytes)
				break;
			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, size_t o, unsigned int cont_level, int mode, int text,
    int flip, uint16_t *indir_count, uint16_t *name_count,
    int *printed_something, int *need_separator, int *returnval)
{
	uint32_t offset = ms->offset;
	uint32_t lhs;
	file_pushbuf_t *pb;
	int rv, oneed_separator, in_type;
	char *rbuf;
	union VALUETYPE *p = &ms->ms_value;
	struct mlist ml;

	if (*indir_count >= ms->indir_max) {
		file_error(ms, 0, "indirect count (%hu) exceeded",
		    *indir_count);
		return -1;
	}

	if (*name_count >= ms->name_max) {
		file_error(ms, 0, "name use count (%hu) exceeded",
		    *name_count);
		return -1;
	}

	if (mcopy(ms, p, m->type, m->flag & INDIR, s, (uint32_t)(offset + o),
	    (uint32_t)nbytes, m) == -1)
		return -1;

	if ((ms->flags & MAGIC_DEBUG) != 0) {
		fprintf(stderr, "mget(type=%d, flag=%x, offset=%u, o=%"
		    SIZE_T_FORMAT "u, " "nbytes=%" SIZE_T_FORMAT
		    "u, il=%hu, nc=%hu)\n",
		    m->type, m->flag, offset, o, nbytes,
		    *indir_count, *name_count);
		mdebug(offset, (char *)(void *)p, sizeof(union VALUETYPE));
#ifndef COMPILE_ONLY
		file_mdump(m);
#endif
	}

	if (m->flag & INDIR) {
		int off = m->in_offset;
		if (m->in_op & FILE_OPINDIRECT) {
			const union VALUETYPE *q = CAST(const union VALUETYPE *,
			    ((const void *)(s + offset + off)));
			if (OFFSET_OOB(nbytes, offset + off, sizeof(*q)))
				return 0;
			switch (cvt_flip(m->in_type, flip)) {
			case FILE_BYTE:
				off = q->b;
				break;
			case FILE_SHORT:
				off = q->h;
				break;
			case FILE_BESHORT:
				off = (short)BE16(q);
				break;
			case FILE_LESHORT:
				off = (short)LE16(q);
				break;
			case FILE_LONG:
				off = q->l;
				break;
			case FILE_BELONG:
			case FILE_BEID3:
				off = (int32_t)BE32(q);
				break;
			case FILE_LEID3:
			case FILE_LELONG:
				off = (int32_t)LE32(q);
				break;
			case FILE_MELONG:
				off = (int32_t)ME32(q);
				break;
			}
			if ((ms->flags & MAGIC_DEBUG) != 0)
				fprintf(stderr, "indirect offs=%u\n", off);
		}
		switch (in_type = cvt_flip(m->in_type, flip)) {
		case FILE_BYTE:
			if (OFFSET_OOB(nbytes, offset, 1))
				return 0;
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = p->b & off;
					break;
				case FILE_OPOR:
					offset = p->b | off;
					break;
				case FILE_OPXOR:
					offset = p->b ^ off;
					break;
				case FILE_OPADD:
					offset = p->b + off;
					break;
				case FILE_OPMINUS:
					offset = p->b - off;
					break;
				case FILE_OPMULTIPLY:
					offset = p->b * off;
					break;
				case FILE_OPDIVIDE:
					offset = p->b / off;
					break;
				case FILE_OPMODULO:
					offset = p->b % off;
					break;
				}
			} else
				offset = p->b;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_BESHORT:
			if (OFFSET_OOB(nbytes, offset, 2))
				return 0;
			lhs = (p->hs[0] << 8) | p->hs[1];
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = lhs & off;
					break;
				case FILE_OPOR:
					offset = lhs | off;
					break;
				case FILE_OPXOR:
					offset = lhs ^ off;
					break;
				case FILE_OPADD:
					offset = lhs + off;
					break;
				case FILE_OPMINUS:
					offset = lhs - off;
					break;
				case FILE_OPMULTIPLY:
					offset = lhs * off;
					break;
				case FILE_OPDIVIDE:
					offset = lhs / off;
					break;
				case FILE_OPMODULO:
					offset = lhs % off;
					break;
				}
			} else
				offset = lhs;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_LESHORT:
			if (OFFSET_OOB(nbytes, offset, 2))
				return 0;
			lhs = (p->hs[1] << 8) | p->hs[0];
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = lhs & off;
					break;
				case FILE_OPOR:
					offset = lhs | off;
					break;
				case FILE_OPXOR:
					offset = lhs ^ off;
					break;
				case FILE_OPADD:
					offset = lhs + off;
					break;
				case FILE_OPMINUS:
					offset = lhs - off;
					break;
				case FILE_OPMULTIPLY:
					offset = lhs * off;
					break;
				case FILE_OPDIVIDE:
					offset = lhs / off;
					break;
				case FILE_OPMODULO:
					offset = lhs % off;
					break;
				}
			} else
				offset = lhs;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_SHORT:
			if (OFFSET_OOB(nbytes, offset, 2))
				return 0;
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = p->h & off;
					break;
				case FILE_OPOR:
					offset = p->h | off;
					break;
				case FILE_OPXOR:
					offset = p->h ^ off;
					break;
				case FILE_OPADD:
					offset = p->h + off;
					break;
				case FILE_OPMINUS:
					offset = p->h - off;
					break;
				case FILE_OPMULTIPLY:
					offset = p->h * off;
					break;
				case FILE_OPDIVIDE:
					offset = p->h / off;
					break;
				case FILE_OPMODULO:
					offset = p->h % off;
					break;
				}
			}
			else
				offset = p->h;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_BELONG:
		case FILE_BEID3:
			if (OFFSET_OOB(nbytes, offset, 4))
				return 0;
			lhs = BE32(p);
			if (in_type == FILE_BEID3)
				lhs = cvt_id3(ms, lhs);
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = lhs & off;
					break;
				case FILE_OPOR:
					offset = lhs | off;
					break;
				case FILE_OPXOR:
					offset = lhs ^ off;
					break;
				case FILE_OPADD:
					offset = lhs + off;
					break;
				case FILE_OPMINUS:
					offset = lhs - off;
					break;
				case FILE_OPMULTIPLY:
					offset = lhs * off;
					break;
				case FILE_OPDIVIDE:
					offset = lhs / off;
					break;
				case FILE_OPMODULO:
					offset = lhs % off;
					break;
				}
			} else
				offset = lhs;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_LELONG:
		case FILE_LEID3:
			if (OFFSET_OOB(nbytes, offset, 4))
				return 0;
			lhs = LE32(p);
			if (in_type == FILE_LEID3)
				lhs = cvt_id3(ms, lhs);
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = lhs & off;
					break;
				case FILE_OPOR:
					offset = lhs | off;
					break;
				case FILE_OPXOR:
					offset = lhs ^ off;
					break;
				case FILE_OPADD:
					offset = lhs + off;
					break;
				case FILE_OPMINUS:
					offset = lhs - off;
					break;
				case FILE_OPMULTIPLY:
					offset = lhs * off;
					break;
				case FILE_OPDIVIDE:
					offset = lhs / off;
					break;
				case FILE_OPMODULO:
					offset = lhs % off;
					break;
				}
			} else
				offset = lhs;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_MELONG:
			if (OFFSET_OOB(nbytes, offset, 4))
				return 0;
			lhs = ME32(p);
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = lhs & off;
					break;
				case FILE_OPOR:
					offset = lhs | off;
					break;
				case FILE_OPXOR:
					offset = lhs ^ off;
					break;
				case FILE_OPADD:
					offset = lhs + off;
					break;
				case FILE_OPMINUS:
					offset = lhs - off;
					break;
				case FILE_OPMULTIPLY:
					offset = lhs * off;
					break;
				case FILE_OPDIVIDE:
					offset = lhs / off;
					break;
				case FILE_OPMODULO:
					offset = lhs % off;
					break;
				}
			} else
				offset = lhs;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		case FILE_LONG:
			if (OFFSET_OOB(nbytes, offset, 4))
				return 0;
			if (off) {
				switch (m->in_op & FILE_OPS_MASK) {
				case FILE_OPAND:
					offset = p->l & off;
					break;
				case FILE_OPOR:
					offset = p->l | off;
					break;
				case FILE_OPXOR:
					offset = p->l ^ off;
					break;
				case FILE_OPADD:
					offset = p->l + off;
					break;
				case FILE_OPMINUS:
					offset = p->l - off;
					break;
				case FILE_OPMULTIPLY:
					offset = p->l * off;
					break;
				case FILE_OPDIVIDE:
					offset = p->l / off;
					break;
				case FILE_OPMODULO:
					offset = p->l % off;
					break;
				}
			} else
				offset = p->l;
			if (m->in_op & FILE_OPINVERSE)
				offset = ~offset;
			break;
		default:
			break;
		}

		if (m->flag & INDIROFFADD) {
			offset += ms->c.li[cont_level-1].off;
			if (offset == 0) {
				if ((ms->flags & MAGIC_DEBUG) != 0)
					fprintf(stderr,
					    "indirect *zero* offset\n");
				return 0;
			}
			if ((ms->flags & MAGIC_DEBUG) != 0)
				fprintf(stderr, "indirect +offs=%u\n", offset);
		}
		if (mcopy(ms, p, m->type, 0, s, offset, nbytes, m) == -1)
			return -1;
		ms->offset = offset;

		if ((ms->flags & MAGIC_DEBUG) != 0) {
			mdebug(offset, (char *)(void *)p,
			    sizeof(union VALUETYPE));
#ifndef COMPILE_ONLY
			file_mdump(m);
#endif
		}
	}

	/* Verify we have enough data to match magic type */
	switch (m->type) {
	case FILE_BYTE:
		if (OFFSET_OOB(nbytes, offset, 1))
			return 0;
		break;

	case FILE_SHORT:
	case FILE_BESHORT:
	case FILE_LESHORT:
		if (OFFSET_OOB(nbytes, offset, 2))
			return 0;
		break;

	case FILE_LONG:
	case FILE_BELONG:
	case FILE_LELONG:
	case FILE_MELONG:
	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_FLOAT:
	case FILE_BEFLOAT:
	case FILE_LEFLOAT:
		if (OFFSET_OOB(nbytes, offset, 4))
			return 0;
		break;

	case FILE_DOUBLE:
	case FILE_BEDOUBLE:
	case FILE_LEDOUBLE:
		if (OFFSET_OOB(nbytes, offset, 8))
			return 0;
		break;

	case FILE_STRING:
	case FILE_PSTRING:
	case FILE_SEARCH:
		if (OFFSET_OOB(nbytes, offset, m->vallen))
			return 0;
		break;

	case FILE_REGEX:
		if (nbytes < offset)
			return 0;
		break;

	case FILE_INDIRECT:
		if (m->str_flags & INDIRECT_RELATIVE)
			offset += CAST(uint32_t, o);
		if (offset == 0)
			return 0;

		if (nbytes < offset)
			return 0;

		if ((pb = file_push_buffer(ms)) == NULL)
			return -1;

		(*indir_count)++;
		rv = file_softmagic(ms, s + offset, nbytes - offset,
		    indir_count, name_count, BINTEST, text);

		if ((ms->flags & MAGIC_DEBUG) != 0)
			fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);

		rbuf = file_pop_buffer(ms, pb);
		if (rbuf == NULL && ms->event_flags & EVENT_HAD_ERR)
			return -1;

		if (rv == 1) {
			if ((ms->flags & MAGIC_NODESC) == 0 &&
			    file_printf(ms, F(ms, m, "%u"), offset) == -1) {
				free(rbuf);
				return -1;
			}
			if (file_printf(ms, "%s", rbuf) == -1) {
				free(rbuf);
				return -1;
			}
		}
		free(rbuf);
		return rv;

	case FILE_USE:
		if (nbytes < offset)
			return 0;
		rbuf = m->value.s;
		if (*rbuf == '^') {
			rbuf++;
			flip = !flip;
		}
		if (file_magicfind(ms, rbuf, &ml) == -1) {
			file_error(ms, 0, "cannot find entry `%s'", rbuf);
			return -1;
		}
		(*name_count)++;
		oneed_separator = *need_separator;
		if (m->flag & NOSPACE)
			*need_separator = 0;
		rv = match(ms, ml.magic, ml.nmagic, s, nbytes, offset + o,
		    mode, text, flip, indir_count, name_count,
		    printed_something, need_separator, returnval);
		if (rv != 1)
		    *need_separator = oneed_separator;
		return 1;

	case FILE_NAME:
		if (ms->flags & MAGIC_NODESC)
			return 1;
		if (file_printf(ms, "%s", m->desc) == -1)
			return -1;
		return 1;
	case FILE_DER:
	case FILE_DEFAULT:	/* nothing to check */
	case FILE_CLEAR:
	default:
		break;
	}
	if (!mconvert(ms, m, flip))
		return 0;
	return 1;
}

private uint64_t
file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags)
{
	/*
	 * Convert the source args to unsigned here so that (1) the
	 * compare will be unsigned as it is in strncmp() and (2) so
	 * the ctype functions will work correctly without extra
	 * casting.
	 */
	const unsigned char *a = (const unsigned char *)s1;
	const unsigned char *b = (const unsigned char *)s2;
	uint64_t v;

	/*
	 * What we want here is v = strncmp(s1, s2, len),
	 * but ignoring any nulls.
	 */
	v = 0;
	if (0L == flags) { /* normal string: do it fast */
		while (len-- > 0)
			if ((v = *b++ - *a++) != '\0')
				break;
	}
	else { /* combine the others */
		while (len-- > 0) {
			if ((flags & STRING_IGNORE_LOWERCASE) &&
			    islower(*a)) {
				if ((v = tolower(*b++) - *a++) != '\0')
					break;
			}
			else if ((flags & STRING_IGNORE_UPPERCASE) &&
			    isupper(*a)) {
				if ((v = toupper(*b++) - *a++) != '\0')
					break;
			}
			else if ((flags & STRING_COMPACT_WHITESPACE) &&
			    isspace(*a)) {
				a++;
				if (isspace(*b++)) {
					if (!isspace(*a))
						while (isspace(*b))
							b++;
				}
				else {
					v = 1;
					break;
				}
			}
			else if ((flags & STRING_COMPACT_OPTIONAL_WHITESPACE) &&
			    isspace(*a)) {
				a++;
				while (isspace(*b))
					b++;
			}
			else {
				if ((v = *b++ - *a++) != '\0')
					break;
			}
		}
	}
	return v;
}

private uint64_t
file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags)
{
	/*
	 * XXX - The 16-bit string compare probably needs to be done
	 * differently, especially if the flags are to be supported.
	 * At the moment, I am unsure.
	 */
	flags = 0;
	return file_strncmp(a, b, len, flags);
}

private int
magiccheck(struct magic_set *ms, struct magic *m)
{
	uint64_t l = m->value.q;
	uint64_t v;
	float fl, fv;
	double dl, dv;
	int matched;
	union VALUETYPE *p = &ms->ms_value;

	switch (m->type) {
	case FILE_BYTE:
		v = p->b;
		break;

	case FILE_SHORT:
	case FILE_BESHORT:
	case FILE_LESHORT:
		v = p->h;
		break;

	case FILE_LONG:
	case FILE_BELONG:
	case FILE_LELONG:
	case FILE_MELONG:
	case FILE_DATE:
	case FILE_BEDATE:
	case FILE_LEDATE:
	case FILE_MEDATE:
	case FILE_LDATE:
	case FILE_BELDATE:
	case FILE_LELDATE:
	case FILE_MELDATE:
		v = p->l;
		break;

	case FILE_QUAD:
	case FILE_LEQUAD:
	case FILE_BEQUAD:
	case FILE_QDATE:
	case FILE_BEQDATE:
	case FILE_LEQDATE:
	case FILE_QLDATE:
	case FILE_BEQLDATE:
	case FILE_LEQLDATE:
	case FILE_QWDATE:
	case FILE_BEQWDATE:
	case FILE_LEQWDATE:
		v = p->q;
		break;

	case FILE_FLOAT:
	case FILE_BEFLOAT:
	case FILE_LEFLOAT:
		fl = m->value.f;
		fv = p->f;
		switch (m->reln) {
		case 'x':
			matched = 1;
			break;

		case '!':
			matched = fv != fl;
			break;

		case '=':
			matched = fv == fl;
			break;

		case '>':
			matched = fv > fl;
			break;

		case '<':
			matched = fv < fl;
			break;

		default:
			file_magerror(ms, "cannot happen with float: invalid relation `%c'",
			    m->reln);
			return -1;
		}
		return matched;

	case FILE_DOUBLE:
	case FILE_BEDOUBLE:
	case FILE_LEDOUBLE:
		dl = m->value.d;
		dv = p->d;
		switch (m->reln) {
		case 'x':
			matched = 1;
			break;

		case '!':
			matched = dv != dl;
			break;

		case '=':
			matched = dv == dl;
			break;

		case '>':
			matched = dv > dl;
			break;

		case '<':
			matched = dv < dl;
			break;

		default:
			file_magerror(ms, "cannot happen with double: invalid relation `%c'", m->reln);
			return -1;
		}
		return matched;

	case FILE_DEFAULT:
	case FILE_CLEAR:
		l = 0;
		v = 0;
		break;

	case FILE_STRING:
	case FILE_PSTRING:
		l = 0;
		v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
		break;

	case FILE_BESTRING16:
	case FILE_LESTRING16:
		l = 0;
		v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
		break;

	case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */
		size_t slen;
		size_t idx;

		if (ms->search.s == NULL)
			return 0;

		slen = MIN(m->vallen, sizeof(m->value.s));
		l = 0;
		v = 0;

		for (idx = 0; m->str_range == 0 || idx < m->str_range; idx++) {
			if (slen + idx > ms->search.s_len)
				break;

			v = file_strncmp(m->value.s, ms->search.s + idx, slen,
			    m->str_flags);
			if (v == 0) {	/* found match */
				ms->search.offset += idx;
				ms->search.rm_len = m->str_range - idx;
				break;
			}
		}
		break;
	}
	case FILE_REGEX: {
		int rc;
		file_regex_t rx;
		const char *search;

		if (ms->search.s == NULL)
			return 0;

		l = 0;
		rc = file_regcomp(&rx, m->value.s,
		    REG_EXTENDED|REG_NEWLINE|
		    ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0));
		if (rc) {
			file_regerror(&rx, rc, ms);
			v = (uint64_t)-1;
		} else {
			regmatch_t pmatch;
			size_t slen = ms->search.s_len;
			char *copy;
			if (slen != 0) {
			    copy = malloc(slen);
			    if (copy == NULL)  {
				file_error(ms, errno,
				    "can't allocate %" SIZE_T_FORMAT "u bytes",
				    slen);
				return -1;
			    }
			    memcpy(copy, ms->search.s, slen);
			    copy[--slen] = '\0';
			    search = copy;
			} else {
			    search = ms->search.s;
			    copy = NULL;
			}
			rc = file_regexec(&rx, (const char *)search,
			    1, &pmatch, 0);
			free(copy);
			switch (rc) {
			case 0:
				ms->search.s += (int)pmatch.rm_so;
				ms->search.offset += (size_t)pmatch.rm_so;
				ms->search.rm_len =
				    (size_t)(pmatch.rm_eo - pmatch.rm_so);
				v = 0;
				break;

			case REG_NOMATCH:
				v = 1;
				break;

			default:
				file_regerror(&rx, rc, ms);
				v = (uint64_t)-1;
				break;
			}
		}
		file_regfree(&rx);
		if (v == (uint64_t)-1)
			return -1;
		break;
	}
	case FILE_INDIRECT:
	case FILE_USE:
	case FILE_NAME:
		return 1;
	case FILE_DER:
		matched = der_cmp(ms, m);
		if (matched == -1) {
			if ((ms->flags & MAGIC_DEBUG) != 0) {
				(void) fprintf(stderr,
				    "EOF comparing DER entries");
			}
			return 0;
		}
		return matched;
	default:
		file_magerror(ms, "invalid type %d in magiccheck()", m->type);
		return -1;
	}

	v = file_signextend(ms, m, v);

	switch (m->reln) {
	case 'x':
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void) fprintf(stderr, "%" INT64_T_FORMAT
			    "u == *any* = 1\n", (unsigned long long)v);
		matched = 1;
		break;

	case '!':
		matched = v != l;
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void) fprintf(stderr, "%" INT64_T_FORMAT "u != %"
			    INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
			    (unsigned long long)l, matched);
		break;

	case '=':
		matched = v == l;
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void) fprintf(stderr, "%" INT64_T_FORMAT "u == %"
			    INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
			    (unsigned long long)l, matched);
		break;

	case '>':
		if (m->flag & UNSIGNED) {
			matched = v > l;
			if ((ms->flags & MAGIC_DEBUG) != 0)
				(void) fprintf(stderr, "%" INT64_T_FORMAT
				    "u > %" INT64_T_FORMAT "u = %d\n",
				    (unsigned long long)v,
				    (unsigned long long)l, matched);
		}
		else {
			matched = (int64_t) v > (int64_t) l;
			if ((ms->flags & MAGIC_DEBUG) != 0)
				(void) fprintf(stderr, "%" INT64_T_FORMAT
				    "d > %" INT64_T_FORMAT "d = %d\n",
				    (long long)v, (long long)l, matched);
		}
		break;

	case '<':
		if (m->flag & UNSIGNED) {
			matched = v < l;
			if ((ms->flags & MAGIC_DEBUG) != 0)
				(void) fprintf(stderr, "%" INT64_T_FORMAT
				    "u < %" INT64_T_FORMAT "u = %d\n",
				    (unsigned long long)v,
				    (unsigned long long)l, matched);
		}
		else {
			matched = (int64_t) v < (int64_t) l;
			if ((ms->flags & MAGIC_DEBUG) != 0)
				(void) fprintf(stderr, "%" INT64_T_FORMAT
				    "d < %" INT64_T_FORMAT "d = %d\n",
				     (long long)v, (long long)l, matched);
		}
		break;

	case '&':
		matched = (v & l) == l;
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
			    INT64_T_FORMAT "x) == %" INT64_T_FORMAT
			    "x) = %d\n", (unsigned long long)v,
			    (unsigned long long)l, (unsigned long long)l,
			    matched);
		break;

	case '^':
		matched = (v & l) != l;
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
			    INT64_T_FORMAT "x) != %" INT64_T_FORMAT
			    "x) = %d\n", (unsigned long long)v,
			    (unsigned long long)l, (unsigned long long)l,
			    matched);
		break;

	default:
		file_magerror(ms, "cannot happen: invalid relation `%c'",
		    m->reln);
		return -1;
	}

	return matched;
}

private int
handle_annotation(struct magic_set *ms, struct magic *m)
{
	if ((ms->flags & MAGIC_APPLE) && m->apple[0]) {
		if (file_printf(ms, "%.8s", m->apple) == -1)
			return -1;
		return 1;
	}
	if ((ms->flags & MAGIC_EXTENSION) && m->ext[0]) {
		if (file_printf(ms, "%s", m->ext) == -1)
			return -1;
		return 1;
	}
	if ((ms->flags & MAGIC_MIME_TYPE) && m->mimetype[0]) {
		if (file_printf(ms, "%s", m->mimetype) == -1)
			return -1;
		return 1;
	}
	return 0;
}

private int
print_sep(struct magic_set *ms, int firstline)
{
	if (ms->flags & MAGIC_NODESC)
		return 0;
	if (firstline)
		return 0;
	/*
	 * we found another match
	 * put a newline and '-' to do some simple formatting
	 */
	return file_printf(ms, "\n- ");
}