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1100 lines
23 KiB
C
1100 lines
23 KiB
C
/*
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* softmagic - interpret variable magic from MAGIC
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*
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* Copyright (c) Ian F. Darwin, 1987.
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* Written by Ian F. Darwin.
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*
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* This software is not subject to any license of the American Telephone
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* and Telegraph Company or of the Regents of the University of California.
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*
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* Permission is granted to anyone to use this software for any purpose on
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* any computer system, and to alter it and redistribute it freely, subject
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* to the following restrictions:
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*
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* 1. The author is not responsible for the consequences of use of this
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* software, no matter how awful, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either by
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* explicit claim or by omission. Since few users ever read sources,
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* credits must appear in the documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not be
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* misrepresented as being the original software. Since few users
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* ever read sources, credits must appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/types.h>
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#include "file.h"
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#ifndef lint
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FILE_RCSID("@(#)$Id: softmagic.c,v 1.46 2001/07/23 00:02:32 christos Exp $")
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#endif /* lint */
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static int match __P((struct magic *, uint32, unsigned char *, int));
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static int mget __P((union VALUETYPE *,
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unsigned char *, struct magic *, int));
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static int mcheck __P((union VALUETYPE *, struct magic *));
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static int32 mprint __P((union VALUETYPE *, struct magic *));
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static void mdebug __P((int32, char *, int));
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static int mconvert __P((union VALUETYPE *, struct magic *));
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extern int kflag;
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/*
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* softmagic - lookup one file in database
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* (already read from /etc/magic by apprentice.c).
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* Passed the name and FILE * of one file to be typed.
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*/
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/*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
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int
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softmagic(buf, nbytes)
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unsigned char *buf;
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int nbytes;
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{
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struct mlist *ml;
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for (ml = mlist.next; ml != &mlist; ml = ml->next)
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if (match(ml->magic, ml->nmagic, buf, nbytes))
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return 1;
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return 0;
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}
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/*
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* Go through the whole list, stopping if you find a match. Process all
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* the continuations of that match before returning.
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*
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* We support multi-level continuations:
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*
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* At any time when processing a successful top-level match, there is a
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* current continuation level; it represents the level of the last
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* successfully matched continuation.
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*
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* Continuations above that level are skipped as, if we see one, it
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* means that the continuation that controls them - i.e, the
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* lower-level continuation preceding them - failed to match.
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*
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* Continuations below that level are processed as, if we see one,
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* it means we've finished processing or skipping higher-level
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* continuations under the control of a successful or unsuccessful
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* lower-level continuation, and are now seeing the next lower-level
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* continuation and should process it. The current continuation
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* level reverts to the level of the one we're seeing.
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*
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* Continuations at the current level are processed as, if we see
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* one, there's no lower-level continuation that may have failed.
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*
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* If a continuation matches, we bump the current continuation level
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* so that higher-level continuations are processed.
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*/
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static int
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match(magic, nmagic, s, nbytes)
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struct magic *magic;
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uint32 nmagic;
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unsigned char *s;
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int nbytes;
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{
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int magindex = 0;
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int cont_level = 0;
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int need_separator = 0;
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union VALUETYPE p;
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static int32 *tmpoff = NULL;
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static size_t tmplen = 0;
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int32 oldoff = 0;
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int returnval = 0; /* if a match is found it is set to 1*/
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int firstline = 1; /* a flag to print X\n X\n- X */
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if (tmpoff == NULL)
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if ((tmpoff = (int32 *) malloc(tmplen = 20)) == NULL)
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error("out of memory\n");
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for (magindex = 0; magindex < nmagic; magindex++) {
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/* if main entry matches, print it... */
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if (!mget(&p, s, &magic[magindex], nbytes) ||
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!mcheck(&p, &magic[magindex])) {
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/*
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* main entry didn't match,
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* flush its continuations
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*/
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while (magindex < nmagic &&
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magic[magindex + 1].cont_level != 0)
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magindex++;
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continue;
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}
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if (! firstline) { /* we found another match */
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/* put a newline and '-' to do some simple formatting*/
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printf("\n- ");
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}
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tmpoff[cont_level] = mprint(&p, &magic[magindex]);
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/*
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* If we printed something, we'll need to print
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* a blank before we print something else.
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*/
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if (magic[magindex].desc[0])
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need_separator = 1;
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/* and any continuations that match */
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if (++cont_level >= tmplen)
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if ((tmpoff = (int32 *) realloc(tmpoff,
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tmplen += 20)) == NULL)
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error("out of memory\n");
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while (magic[magindex+1].cont_level != 0 &&
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++magindex < nmagic) {
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if (cont_level >= magic[magindex].cont_level) {
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if (cont_level > magic[magindex].cont_level) {
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/*
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* We're at the end of the level
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* "cont_level" continuations.
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*/
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cont_level = magic[magindex].cont_level;
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}
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if (magic[magindex].flag & OFFADD) {
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oldoff=magic[magindex].offset;
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magic[magindex].offset +=
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tmpoff[cont_level-1];
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}
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if (mget(&p, s, &magic[magindex], nbytes) &&
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mcheck(&p, &magic[magindex])) {
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/*
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* This continuation matched.
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* Print its message, with
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* a blank before it if
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* the previous item printed
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* and this item isn't empty.
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*/
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/* space if previous printed */
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if (need_separator
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&& (magic[magindex].nospflag == 0)
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&& (magic[magindex].desc[0] != '\0')
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) {
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(void) putchar(' ');
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need_separator = 0;
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}
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tmpoff[cont_level] =
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mprint(&p, &magic[magindex]);
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if (magic[magindex].desc[0])
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need_separator = 1;
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/*
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* If we see any continuations
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* at a higher level,
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* process them.
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*/
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if (++cont_level >= tmplen)
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if ((tmpoff =
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(int32 *) realloc(tmpoff,
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tmplen += 20)) == NULL)
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error("out of memory\n");
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}
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if (magic[magindex].flag & OFFADD) {
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magic[magindex].offset = oldoff;
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}
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}
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}
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firstline = 0;
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returnval = 1;
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if (!kflag) {
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return 1; /* don't keep searching */
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}
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}
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return returnval; /* This is hit if -k is set or there is no match */
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}
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static int32
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mprint(p, m)
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union VALUETYPE *p;
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struct magic *m;
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{
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uint32 v;
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int32 t=0 ;
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switch (m->type) {
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case BYTE:
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v = signextend(m, p->b);
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(void) printf(m->desc, (unsigned char) v);
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t = m->offset + sizeof(char);
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break;
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case SHORT:
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case BESHORT:
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case LESHORT:
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v = signextend(m, p->h);
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(void) printf(m->desc, (unsigned short) v);
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t = m->offset + sizeof(short);
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break;
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case LONG:
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case BELONG:
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case LELONG:
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v = signextend(m, p->l);
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(void) printf(m->desc, (uint32) v);
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t = m->offset + sizeof(int32);
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break;
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case STRING:
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case PSTRING:
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if (m->reln == '=') {
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(void) printf(m->desc, m->value.s);
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t = m->offset + strlen(m->value.s);
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}
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else {
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if (*m->value.s == '\0') {
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char *cp = strchr(p->s,'\n');
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if (cp)
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*cp = '\0';
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}
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(void) printf(m->desc, p->s);
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t = m->offset + strlen(p->s);
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}
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break;
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case DATE:
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case BEDATE:
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case LEDATE:
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(void) printf(m->desc, fmttime(p->l, 1));
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t = m->offset + sizeof(time_t);
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break;
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case LDATE:
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case BELDATE:
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case LELDATE:
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(void) printf(m->desc, fmttime(p->l, 0));
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t = m->offset + sizeof(time_t);
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break;
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default:
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error("invalid m->type (%d) in mprint().\n", m->type);
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/*NOTREACHED*/
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}
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return(t);
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}
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/*
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* Convert the byte order of the data we are looking at
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* While we're here, let's apply the mask operation
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* (unless you have a better idea)
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*/
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static int
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mconvert(p, m)
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union VALUETYPE *p;
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struct magic *m;
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{
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switch (m->type) {
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case BYTE:
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->b &= m->mask;
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break;
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case OPOR:
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p->b |= m->mask;
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break;
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case OPXOR:
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p->b ^= m->mask;
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break;
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case OPADD:
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p->b += m->mask;
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break;
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case OPMINUS:
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p->b -= m->mask;
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break;
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case OPMULTIPLY:
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p->b *= m->mask;
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break;
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case OPDIVIDE:
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p->b /= m->mask;
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break;
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case OPMODULO:
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p->b %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->b = ~p->b;
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return 1;
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case SHORT:
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->h &= m->mask;
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break;
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case OPOR:
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p->h |= m->mask;
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break;
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case OPXOR:
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p->h ^= m->mask;
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break;
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case OPADD:
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p->h += m->mask;
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break;
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case OPMINUS:
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p->h -= m->mask;
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break;
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case OPMULTIPLY:
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p->h *= m->mask;
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break;
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case OPDIVIDE:
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p->h /= m->mask;
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break;
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case OPMODULO:
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p->h %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->h = ~p->h;
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return 1;
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case LONG:
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case DATE:
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case LDATE:
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->l &= m->mask;
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break;
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case OPOR:
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p->l |= m->mask;
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break;
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case OPXOR:
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p->l ^= m->mask;
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break;
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case OPADD:
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p->l += m->mask;
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break;
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case OPMINUS:
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p->l -= m->mask;
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break;
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case OPMULTIPLY:
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p->l *= m->mask;
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break;
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case OPDIVIDE:
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p->l /= m->mask;
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break;
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case OPMODULO:
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p->l %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->l = ~p->l;
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return 1;
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case STRING:
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{
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int n;
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/* Null terminate and eat *trailing* return */
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p->s[sizeof(p->s) - 1] = '\0';
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n = strlen(p->s) - 1;
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if (p->s[n] == '\n')
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p->s[n] = '\0';
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return 1;
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}
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case PSTRING:
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{
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char *ptr1 = p->s, *ptr2 = ptr1 + 1;
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int n = *p->s;
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if (n >= sizeof(p->s))
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n = sizeof(p->s) - 1;
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while (n--)
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*ptr1++ = *ptr2++;
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*ptr1 = '\0';
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n = strlen(p->s) - 1;
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if (p->s[n] == '\n')
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p->s[n] = '\0';
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return 1;
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}
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case BESHORT:
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p->h = (short)((p->hs[0]<<8)|(p->hs[1]));
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->h &= m->mask;
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break;
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case OPOR:
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p->h |= m->mask;
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break;
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case OPXOR:
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p->h ^= m->mask;
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break;
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case OPADD:
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p->h += m->mask;
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break;
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case OPMINUS:
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p->h -= m->mask;
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break;
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case OPMULTIPLY:
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p->h *= m->mask;
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break;
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case OPDIVIDE:
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p->h /= m->mask;
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break;
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case OPMODULO:
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p->h %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->h = ~p->h;
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return 1;
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case BELONG:
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case BEDATE:
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case BELDATE:
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p->l = (int32)
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((p->hl[0]<<24)|(p->hl[1]<<16)|(p->hl[2]<<8)|(p->hl[3]));
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->l &= m->mask;
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break;
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case OPOR:
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p->l |= m->mask;
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break;
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case OPXOR:
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p->l ^= m->mask;
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break;
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case OPADD:
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p->l += m->mask;
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break;
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case OPMINUS:
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p->l -= m->mask;
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break;
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case OPMULTIPLY:
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p->l *= m->mask;
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break;
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case OPDIVIDE:
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p->l /= m->mask;
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break;
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case OPMODULO:
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p->l %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->l = ~p->l;
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return 1;
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case LESHORT:
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p->h = (short)((p->hs[1]<<8)|(p->hs[0]));
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->h &= m->mask;
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break;
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case OPOR:
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p->h |= m->mask;
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break;
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case OPXOR:
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p->h ^= m->mask;
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break;
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case OPADD:
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p->h += m->mask;
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break;
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case OPMINUS:
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p->h -= m->mask;
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break;
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case OPMULTIPLY:
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p->h *= m->mask;
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break;
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case OPDIVIDE:
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p->h /= m->mask;
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break;
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case OPMODULO:
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p->h %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->h = ~p->h;
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return 1;
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case LELONG:
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case LEDATE:
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case LELDATE:
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p->l = (int32)
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((p->hl[3]<<24)|(p->hl[2]<<16)|(p->hl[1]<<8)|(p->hl[0]));
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if (m->mask)
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switch (m->mask_op&0x7F) {
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case OPAND:
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p->l &= m->mask;
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break;
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case OPOR:
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p->l |= m->mask;
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break;
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case OPXOR:
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p->l ^= m->mask;
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break;
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case OPADD:
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p->l += m->mask;
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break;
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case OPMINUS:
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p->l -= m->mask;
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break;
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case OPMULTIPLY:
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p->l *= m->mask;
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break;
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case OPDIVIDE:
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p->l /= m->mask;
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break;
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case OPMODULO:
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p->l %= m->mask;
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break;
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}
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if (m->mask_op & OPINVERSE)
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p->l = ~p->l;
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return 1;
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default:
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error("invalid type %d in mconvert().\n", m->type);
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return 0;
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}
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}
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static void
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mdebug(offset, str, len)
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|
int32 offset;
|
|
char *str;
|
|
int len;
|
|
{
|
|
(void) fprintf(stderr, "mget @%d: ", offset);
|
|
showstr(stderr, (char *) str, len);
|
|
(void) fputc('\n', stderr);
|
|
(void) fputc('\n', stderr);
|
|
}
|
|
|
|
static int
|
|
mget(p, s, m, nbytes)
|
|
union VALUETYPE* p;
|
|
unsigned char *s;
|
|
struct magic *m;
|
|
int nbytes;
|
|
{
|
|
int32 offset = m->offset;
|
|
|
|
if (offset + sizeof(union VALUETYPE) <= nbytes)
|
|
memcpy(p, s + offset, sizeof(union VALUETYPE));
|
|
else {
|
|
/*
|
|
* the usefulness of padding with zeroes eludes me, it
|
|
* might even cause problems
|
|
*/
|
|
int32 have = nbytes - offset;
|
|
memset(p, 0, sizeof(union VALUETYPE));
|
|
if (have > 0)
|
|
memcpy(p, s + offset, have);
|
|
}
|
|
|
|
|
|
if (debug) {
|
|
mdebug(offset, (char *) p, sizeof(union VALUETYPE));
|
|
mdump(m);
|
|
}
|
|
|
|
if (m->flag & INDIR) {
|
|
|
|
switch (m->in_type) {
|
|
case BYTE:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = p->b & m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = p->b | m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = p->b ^ m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = p->b + m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = p->b - m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = p->b * m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = p->b / m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = p->b % m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case BESHORT:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) &
|
|
m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) |
|
|
m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) ^
|
|
m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) +
|
|
m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) -
|
|
m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) *
|
|
m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) /
|
|
m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = (short)((p->hs[0]<<8)|
|
|
(p->hs[1])) %
|
|
m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case LESHORT:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) &
|
|
m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) |
|
|
m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) ^
|
|
m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) +
|
|
m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) -
|
|
m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) *
|
|
m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) /
|
|
m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = (short)((p->hs[1]<<8)|
|
|
(p->hs[0])) %
|
|
m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case SHORT:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = p->h & m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = p->h | m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = p->h ^ m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = p->h + m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = p->h - m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = p->h * m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = p->h / m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = p->h % m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case BELONG:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) &
|
|
m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) |
|
|
m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) ^
|
|
m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) +
|
|
m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) -
|
|
m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) *
|
|
m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) /
|
|
m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = (int32)((p->hl[0]<<24)|
|
|
(p->hl[1]<<16)|
|
|
(p->hl[2]<<8)|
|
|
(p->hl[3])) %
|
|
m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case LELONG:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) &
|
|
m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) |
|
|
m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) ^
|
|
m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) +
|
|
m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) -
|
|
m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) *
|
|
m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) /
|
|
m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = (int32)((p->hl[3]<<24)|
|
|
(p->hl[2]<<16)|
|
|
(p->hl[1]<<8)|
|
|
(p->hl[0])) %
|
|
m->in_offset;
|
|
break;
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
case LONG:
|
|
if (m->in_offset)
|
|
switch (m->in_op&0x7F) {
|
|
case OPAND:
|
|
offset = p->l & m->in_offset;
|
|
break;
|
|
case OPOR:
|
|
offset = p->l | m->in_offset;
|
|
break;
|
|
case OPXOR:
|
|
offset = p->l ^ m->in_offset;
|
|
break;
|
|
case OPADD:
|
|
offset = p->l + m->in_offset;
|
|
break;
|
|
case OPMINUS:
|
|
offset = p->l - m->in_offset;
|
|
break;
|
|
case OPMULTIPLY:
|
|
offset = p->l * m->in_offset;
|
|
break;
|
|
case OPDIVIDE:
|
|
offset = p->l / m->in_offset;
|
|
break;
|
|
case OPMODULO:
|
|
offset = p->l % m->in_offset;
|
|
break;
|
|
/* case TOOMANYSWITCHBLOCKS:
|
|
* ugh = p->eye % m->strain;
|
|
* rub;
|
|
* case BEER:
|
|
* off = p->tab & m->in_gest;
|
|
* sleep;
|
|
*/
|
|
}
|
|
if (m->in_op & OPINVERSE)
|
|
offset = ~offset;
|
|
break;
|
|
}
|
|
|
|
if (offset + sizeof(union VALUETYPE) > nbytes)
|
|
return 0;
|
|
|
|
memcpy(p, s + offset, sizeof(union VALUETYPE));
|
|
|
|
if (debug) {
|
|
mdebug(offset, (char *) p, sizeof(union VALUETYPE));
|
|
mdump(m);
|
|
}
|
|
}
|
|
if (!mconvert(p, m))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
mcheck(p, m)
|
|
union VALUETYPE* p;
|
|
struct magic *m;
|
|
{
|
|
uint32 l = m->value.l;
|
|
uint32 v;
|
|
int matched;
|
|
|
|
if ( (m->value.s[0] == 'x') && (m->value.s[1] == '\0') ) {
|
|
fprintf(stderr, "BOINK");
|
|
return 1;
|
|
}
|
|
|
|
|
|
switch (m->type) {
|
|
case BYTE:
|
|
v = p->b;
|
|
break;
|
|
|
|
case SHORT:
|
|
case BESHORT:
|
|
case LESHORT:
|
|
v = p->h;
|
|
break;
|
|
|
|
case LONG:
|
|
case BELONG:
|
|
case LELONG:
|
|
case DATE:
|
|
case BEDATE:
|
|
case LEDATE:
|
|
case LDATE:
|
|
case BELDATE:
|
|
case LELDATE:
|
|
v = p->l;
|
|
break;
|
|
|
|
case STRING:
|
|
case PSTRING:
|
|
{
|
|
/*
|
|
* What we want here is:
|
|
* v = strncmp(m->value.s, p->s, m->vallen);
|
|
* but ignoring any nulls. bcmp doesn't give -/+/0
|
|
* and isn't universally available anyway.
|
|
*/
|
|
unsigned char *a = (unsigned char*)m->value.s;
|
|
unsigned char *b = (unsigned char*)p->s;
|
|
int len = m->vallen;
|
|
l = 0;
|
|
v = 0;
|
|
if (0L == m->mask) { /* normal string: do it fast */
|
|
while (--len >= 0)
|
|
if ((v = *b++ - *a++) != '\0')
|
|
break;
|
|
} else { /* combine the others */
|
|
while (--len >= 0) {
|
|
if ((m->mask & STRING_IGNORE_LOWERCASE) &&
|
|
islower(*a)) {
|
|
if ((v = tolower(*b++) - *a++) != '\0')
|
|
break;
|
|
} else if ((m->mask & STRING_COMPACT_BLANK) &&
|
|
isspace(*a)) {
|
|
a++;
|
|
if (isspace(*b++)) {
|
|
while (isspace(*b))
|
|
b++;
|
|
} else {
|
|
v = 1;
|
|
break;
|
|
}
|
|
} else if (isspace(*a) &&
|
|
(m->mask & STRING_COMPACT_OPTIONAL_BLANK)) {
|
|
a++;
|
|
while (isspace(*b))
|
|
b++;
|
|
} else {
|
|
if ((v = *b++ - *a++) != '\0')
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
error("invalid type %d in mcheck().\n", m->type);
|
|
return 0;/*NOTREACHED*/
|
|
}
|
|
|
|
if(m->type != STRING && m->type != PSTRING)
|
|
v = signextend(m, v);
|
|
|
|
switch (m->reln) {
|
|
case 'x':
|
|
if (debug)
|
|
(void) fprintf(stderr, "%u == *any* = 1\n", v);
|
|
matched = 1;
|
|
break;
|
|
|
|
case '!':
|
|
matched = v != l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%u != %u = %d\n",
|
|
v, l, matched);
|
|
break;
|
|
|
|
case '=':
|
|
matched = v == l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%u == %u = %d\n",
|
|
v, l, matched);
|
|
break;
|
|
|
|
case '>':
|
|
if (m->flag & UNSIGNED) {
|
|
matched = v > l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%u > %u = %d\n",
|
|
v, l, matched);
|
|
}
|
|
else {
|
|
matched = (int32) v > (int32) l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%d > %d = %d\n",
|
|
v, l, matched);
|
|
}
|
|
break;
|
|
|
|
case '<':
|
|
if (m->flag & UNSIGNED) {
|
|
matched = v < l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%u < %u = %d\n",
|
|
v, l, matched);
|
|
}
|
|
else {
|
|
matched = (int32) v < (int32) l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "%d < %d = %d\n",
|
|
v, l, matched);
|
|
}
|
|
break;
|
|
|
|
case '&':
|
|
matched = (v & l) == l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "((%x & %x) == %x) = %d\n",
|
|
v, l, l, matched);
|
|
break;
|
|
|
|
case '^':
|
|
matched = (v & l) != l;
|
|
if (debug)
|
|
(void) fprintf(stderr, "((%x & %x) != %x) = %d\n",
|
|
v, l, l, matched);
|
|
break;
|
|
|
|
default:
|
|
matched = 0;
|
|
error("mcheck: can't happen: invalid relation %d.\n", m->reln);
|
|
break;/*NOTREACHED*/
|
|
}
|
|
|
|
return matched;
|
|
}
|