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- /*
- * Copyright (c) Ian F. Darwin 1986-1995.
- * Software written by Ian F. Darwin and others;
- * maintained 1995-present by Christos Zoulas and others.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice immediately at the beginning of the file, without modification,
- * this list of conditions, and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * softmagic - interpret variable magic from MAGIC
- */
- #include "file.h"
- #ifndef lint
- FILE_RCSID("@(#)$File: softmagic.c,v 1.180 2014/03/15 21:47:40 christos Exp $")
- #endif /* lint */
- #include "magic.h"
- #define F(a, b) fmtcheck((a), (b))
- #include <assert.h>
- #include <string.h>
- #include <ctype.h>
- #include <stdlib.h>
- #include <time.h>
- #if defined(HAVE_LOCALE_H)
- #include <locale.h>
- #endif
- private int match(struct magic_set *, struct magic *, uint32_t,
- const unsigned char *, size_t, size_t, int, int, int, int, int *, int *,
- int *);
- private int mget(struct magic_set *, const unsigned char *,
- struct magic *, size_t, size_t, unsigned int, int, int, int, int, int *,
- int *, int *);
- private int magiccheck(struct magic_set *, struct magic *);
- private int32_t mprint(struct magic_set *, struct magic *);
- private int32_t moffset(struct magic_set *, struct magic *);
- private void mdebug(uint32_t, const char *, size_t);
- private int mcopy(struct magic_set *, union VALUETYPE *, int, int,
- const unsigned char *, uint32_t, size_t, size_t);
- private int mconvert(struct magic_set *, struct magic *, int);
- private int print_sep(struct magic_set *, int);
- private int handle_annotation(struct magic_set *, struct magic *);
- private void cvt_8(union VALUETYPE *, const struct magic *);
- private void cvt_16(union VALUETYPE *, const struct magic *);
- private void cvt_32(union VALUETYPE *, const struct magic *);
- private void cvt_64(union VALUETYPE *, const struct magic *);
- #define OFFSET_OOB(n, o, i) ((n) < (o) || (i) > ((n) - (o)))
- /*
- * 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,
- size_t level, int mode, int text)
- {
- struct mlist *ml;
- int rv, printed_something = 0, need_separator = 0;
- 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, level, &printed_something, &need_separator,
- NULL)) != 0)
- return rv;
- return 0;
- }
- /*
- * Go through the whole list, stopping if you find a match. Process all
- * the continuations of that match before returning.
- *
- * We support multi-level continuations:
- *
- * At any time when processing a successful top-level match, there is a
- * current continuation level; it represents the level of the last
- * successfully matched continuation.
- *
- * Continuations above that level are skipped as, if we see one, it
- * means that the continuation that controls them - i.e, the
- * lower-level continuation preceding them - failed to match.
- *
- * Continuations below that level are processed as, if we see one,
- * it means we've finished processing or skipping higher-level
- * continuations under the control of a successful or unsuccessful
- * lower-level continuation, and are now seeing the next lower-level
- * continuation and should process it. The current continuation
- * level reverts to the level of the one we're seeing.
- *
- * Continuations at the current level are processed as, if we see
- * one, there's no lower-level continuation that may have failed.
- *
- * If a continuation matches, we bump the current continuation level
- * so that higher-level continuations are processed.
- */
- private int
- match(struct magic_set *ms, struct magic *magic, uint32_t nmagic,
- const unsigned char *s, size_t nbytes, size_t offset, int mode, int text,
- int flip, int recursion_level, 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_MIME|MAGIC_APPLE)) == 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) {
- /* Skip sub-tests */
- while (magindex + 1 < nmagic &&
- magic[magindex + 1].cont_level != 0 &&
- ++magindex)
- continue;
- 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, recursion_level + 1, 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
- */
- while (magindex < nmagic - 1 &&
- magic[magindex + 1].cont_level != 0)
- magindex++;
- continue;
- }
- 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;
- ms->c.li[cont_level].off = moffset(ms, m);
- /* and any continuations that match */
- if (file_check_mem(ms, ++cont_level) == -1)
- return -1;
- while (magic[magindex+1].cont_level != 0 &&
- ++magindex < nmagic) {
- 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, recursion_level + 1, 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;
- ms->c.li[cont_level].off = moffset(ms, m);
- if (*m->desc)
- *need_separator = 1;
- /*
- * If we see any continuations
- * at a higher level,
- * process them.
- */
- if (file_check_mem(ms, ++cont_level) == -1)
- return -1;
- break;
- }
- }
- if (*printed_something) {
- firstline = 0;
- if (print)
- *returnval = 1;
- }
- if ((ms->flags & MAGIC_CONTINUE) == 0 && *printed_something) {
- return *returnval; /* don't keep searching */
- }
- }
- return *returnval; /* This is hit if -k is set or there is no match */
- }
- private int
- check_fmt(struct magic_set *ms, struct magic *m)
- {
- regex_t rx;
- int rc, rv = -1;
- char *old_lc_ctype;
- if (strchr(m->desc, '%') == NULL)
- return 0;
- old_lc_ctype = setlocale(LC_CTYPE, NULL);
- assert(old_lc_ctype != NULL);
- old_lc_ctype = strdup(old_lc_ctype);
- assert(old_lc_ctype != NULL);
- (void)setlocale(LC_CTYPE, "C");
- rc = regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB);
- if (rc) {
- char errmsg[512];
- (void)regerror(rc, &rx, errmsg, sizeof(errmsg));
- file_magerror(ms, "regex error %d, (%s)", rc, errmsg);
- } else {
- rc = regexec(&rx, m->desc, 0, 0, 0);
- regfree(&rx);
- rv = !rc;
- }
- (void)setlocale(LC_CTYPE, old_lc_ctype);
- free(old_lc_ctype);
- 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];
- union VALUETYPE *p = &ms->ms_value;
- switch (m->type) {
- case FILE_BYTE:
- v = file_signextend(ms, m, (uint64_t)p->b);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%c",
- (unsigned char)v);
- if (file_printf(ms, F(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%c"),
- (unsigned char) v) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(char);
- break;
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- v = file_signextend(ms, m, (uint64_t)p->h);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%hu",
- (unsigned short)v);
- if (file_printf(ms, F(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%hu"),
- (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(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%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), "%llu",
- (unsigned long long)v);
- if (file_printf(ms, F(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%llu"),
- (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(m->desc, "%s"), 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, "\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(m->desc, "%s"), 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(m->desc, "%s"),
- file_fmttime(p->l, FILE_T_LOCAL, 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(m->desc, "%s"),
- file_fmttime(p->l, 0, 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(m->desc, "%s"),
- file_fmttime(p->q, FILE_T_LOCAL, 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(m->desc, "%s"),
- file_fmttime(p->q, 0, 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(m->desc, "%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(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%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(m->desc, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(m->desc, "%g"), vd) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(double);
- break;
- 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(m->desc, "%s"), 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_SEARCH:
- if (file_printf(ms, F(m->desc, "%s"), m->value.s) == -1)
- return -1;
- if ((m->str_flags & REGEX_OFFSET_START))
- t = ms->search.offset;
- else
- t = ms->search.offset + m->vallen;
- break;
- case FILE_DEFAULT:
- case FILE_CLEAR:
- if (file_printf(ms, "%s", m->desc) == -1)
- return -1;
- t = ms->offset;
- break;
- case FILE_INDIRECT:
- case FILE_USE:
- case FILE_NAME:
- t = ms->offset;
- break;
- default:
- file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
- return -1;
- }
- return (int32_t)t;
- }
- private int32_t
- moffset(struct magic_set *ms, struct magic *m)
- {
- switch (m->type) {
- case FILE_BYTE:
- return CAST(int32_t, (ms->offset + sizeof(char)));
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- return CAST(int32_t, (ms->offset + sizeof(short)));
- case FILE_LONG:
- case FILE_BELONG:
- case FILE_LELONG:
- case FILE_MELONG:
- return CAST(int32_t, (ms->offset + sizeof(int32_t)));
- case FILE_QUAD:
- case FILE_BEQUAD:
- case FILE_LEQUAD:
- return CAST(int32_t, (ms->offset + sizeof(int64_t)));
- case FILE_STRING:
- case FILE_PSTRING:
- case FILE_BESTRING16:
- case FILE_LESTRING16:
- if (m->reln == '=' || m->reln == '!')
- return ms->offset + m->vallen;
- else {
- union VALUETYPE *p = &ms->ms_value;
- uint32_t t;
- if (*m->value.s == '\0')
- p->s[strcspn(p->s, "\n")] = '\0';
- t = CAST(uint32_t, (ms->offset + strlen(p->s)));
- if (m->type == FILE_PSTRING)
- t += (uint32_t)file_pstring_length_size(m);
- return t;
- }
- case FILE_DATE:
- case FILE_BEDATE:
- case FILE_LEDATE:
- case FILE_MEDATE:
- return CAST(int32_t, (ms->offset + sizeof(uint32_t)));
- case FILE_LDATE:
- case FILE_BELDATE:
- case FILE_LELDATE:
- case FILE_MELDATE:
- return CAST(int32_t, (ms->offset + sizeof(uint32_t)));
- case FILE_QDATE:
- case FILE_BEQDATE:
- case FILE_LEQDATE:
- return CAST(int32_t, (ms->offset + sizeof(uint64_t)));
- case FILE_QLDATE:
- case FILE_BEQLDATE:
- case FILE_LEQLDATE:
- return CAST(int32_t, (ms->offset + sizeof(uint64_t)));
- case FILE_FLOAT:
- case FILE_BEFLOAT:
- case FILE_LEFLOAT:
- return CAST(int32_t, (ms->offset + sizeof(float)));
- case FILE_DOUBLE:
- case FILE_BEDOUBLE:
- case FILE_LEDOUBLE:
- return CAST(int32_t, (ms->offset + sizeof(double)));
- case FILE_REGEX:
- if ((m->str_flags & REGEX_OFFSET_START) != 0)
- return CAST(int32_t, ms->search.offset);
- else
- return CAST(int32_t, (ms->search.offset +
- ms->search.rm_len));
- case FILE_SEARCH:
- if ((m->str_flags & REGEX_OFFSET_START) != 0)
- return CAST(int32_t, ms->search.offset);
- else
- return CAST(int32_t, (ms->search.offset + m->vallen));
- case FILE_CLEAR:
- case FILE_DEFAULT:
- case FILE_INDIRECT:
- return ms->offset;
- default:
- return 0;
- }
- }
- 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: \
- p->fld /= cast m->num_mask; \
- break; \
- case FILE_OPMODULO: \
- p->fld %= cast m->num_mask; \
- break; \
- } \
- if (m->mask_op & FILE_OPINVERSE) \
- p->fld = ~p->fld \
- private void
- cvt_8(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(b, (uint8_t));
- }
- private void
- cvt_16(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(h, (uint16_t));
- }
- private void
- cvt_32(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(l, (uint32_t));
- }
- private void
- cvt_64(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(q, (uint64_t));
- }
- #define DO_CVT2(fld, cast) \
- if (m->num_mask) \
- switch (m->mask_op & FILE_OPS_MASK) { \
- case FILE_OPADD: \
- p->fld += cast m->num_mask; \
- break; \
- case FILE_OPMINUS: \
- p->fld -= cast m->num_mask; \
- break; \
- case FILE_OPMULTIPLY: \
- p->fld *= cast m->num_mask; \
- break; \
- case FILE_OPDIVIDE: \
- p->fld /= cast m->num_mask; \
- break; \
- } \
- private void
- cvt_float(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT2(f, (float));
- }
- private void
- cvt_double(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT2(d, (double));
- }
- /*
- * Convert the byte order of the data we are looking at
- * While we're here, let's apply the mask operation
- * (unless you have a better idea)
- */
- private int
- mconvert(struct magic_set *ms, struct magic *m, int flip)
- {
- union VALUETYPE *p = &ms->ms_value;
- switch (cvt_flip(m->type, flip)) {
- case FILE_BYTE:
- cvt_8(p, m);
- return 1;
- case FILE_SHORT:
- cvt_16(p, m);
- return 1;
- case FILE_LONG:
- case FILE_DATE:
- case FILE_LDATE:
- cvt_32(p, m);
- return 1;
- case FILE_QUAD:
- case FILE_QDATE:
- case FILE_QLDATE:
- case FILE_QWDATE:
- cvt_64(p, m);
- return 1;
- case FILE_STRING:
- case FILE_BESTRING16:
- case FILE_LESTRING16: {
- /* Null terminate and eat *trailing* return */
- p->s[sizeof(p->s) - 1] = '\0';
- return 1;
- }
- case FILE_PSTRING: {
- char *ptr1 = p->s, *ptr2 = ptr1 + file_pstring_length_size(m);
- size_t len = file_pstring_get_length(m, ptr1);
- if (len >= sizeof(p->s))
- len = sizeof(p->s) - 1;
- while (len--)
- *ptr1++ = *ptr2++;
- *ptr1 = '\0';
- return 1;
- }
- case FILE_BESHORT:
- p->h = (short)((p->hs[0]<<8)|(p->hs[1]));
- cvt_16(p, m);
- return 1;
- case FILE_BELONG:
- case FILE_BEDATE:
- case FILE_BELDATE:
- p->l = (int32_t)
- ((p->hl[0]<<24)|(p->hl[1]<<16)|(p->hl[2]<<8)|(p->hl[3]));
- cvt_32(p, m);
- return 1;
- case FILE_BEQUAD:
- case FILE_BEQDATE:
- case FILE_BEQLDATE:
- case FILE_BEQWDATE:
- p->q = (uint64_t)
- (((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)|
- ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)|
- ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)|
- ((uint64_t)p->hq[6]<<8)|((uint64_t)p->hq[7]));
- cvt_64(p, m);
- return 1;
- case FILE_LESHORT:
- p->h = (short)((p->hs[1]<<8)|(p->hs[0]));
- cvt_16(p, m);
- return 1;
- case FILE_LELONG:
- case FILE_LEDATE:
- case FILE_LELDATE:
- p->l = (int32_t)
- ((p->hl[3]<<24)|(p->hl[2]<<16)|(p->hl[1]<<8)|(p->hl[0]));
- cvt_32(p, m);
- return 1;
- case FILE_LEQUAD:
- case FILE_LEQDATE:
- case FILE_LEQLDATE:
- case FILE_LEQWDATE:
- p->q = (uint64_t)
- (((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)|
- ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)|
- ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)|
- ((uint64_t)p->hq[1]<<8)|((uint64_t)p->hq[0]));
- cvt_64(p, m);
- return 1;
- case FILE_MELONG:
- case FILE_MEDATE:
- case FILE_MELDATE:
- p->l = (int32_t)
- ((p->hl[1]<<24)|(p->hl[0]<<16)|(p->hl[3]<<8)|(p->hl[2]));
- cvt_32(p, m);
- return 1;
- case FILE_FLOAT:
- cvt_float(p, m);
- return 1;
- case FILE_BEFLOAT:
- p->l = ((uint32_t)p->hl[0]<<24)|((uint32_t)p->hl[1]<<16)|
- ((uint32_t)p->hl[2]<<8) |((uint32_t)p->hl[3]);
- cvt_float(p, m);
- return 1;
- case FILE_LEFLOAT:
- p->l = ((uint32_t)p->hl[3]<<24)|((uint32_t)p->hl[2]<<16)|
- ((uint32_t)p->hl[1]<<8) |((uint32_t)p->hl[0]);
- cvt_float(p, m);
- return 1;
- case FILE_DOUBLE:
- cvt_double(p, m);
- return 1;
- case FILE_BEDOUBLE:
- p->q = ((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)|
- ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)|
- ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)|
- ((uint64_t)p->hq[6]<<8) |((uint64_t)p->hq[7]);
- cvt_double(p, m);
- return 1;
- case FILE_LEDOUBLE:
- p->q = ((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)|
- ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)|
- ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)|
- ((uint64_t)p->hq[1]<<8) |((uint64_t)p->hq[0]);
- cvt_double(p, m);
- return 1;
- case FILE_REGEX:
- case FILE_SEARCH:
- case FILE_DEFAULT:
- case FILE_CLEAR:
- case FILE_NAME:
- case FILE_USE:
- return 1;
- default:
- file_magerror(ms, "invalid type %d in mconvert()", m->type);
- return 0;
- }
- }
- private void
- mdebug(uint32_t offset, const char *str, size_t len)
- {
- (void) fprintf(stderr, "mget/%zu @%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, size_t linecnt)
- {
- /*
- * Note: FILE_SEARCH and FILE_REGEX do not actually copy
- * anything, but setup pointers into the source
- */
- if (indir == 0) {
- switch (type) {
- case FILE_SEARCH:
- ms->search.s = RCAST(const char *, s) + offset;
- ms->search.s_len = nbytes - offset;
- ms->search.offset = offset;
- return 0;
- case FILE_REGEX: {
- const char *b;
- const char *c;
- const char *last; /* end of search region */
- const char *buf; /* start of search region */
- const char *end;
- size_t lines;
- if (s == NULL) {
- ms->search.s_len = 0;
- ms->search.s = NULL;
- return 0;
- }
- buf = RCAST(const char *, s) + offset;
- end = last = RCAST(const char *, s) + nbytes;
- /* mget() guarantees buf <= last */
- for (lines = linecnt, b = buf; lines && b < end &&
- ((b = CAST(const char *,
- memchr(c = b, '\n', CAST(size_t, (end - b)))))
- || (b = CAST(const char *,
- memchr(c, '\r', CAST(size_t, (end - c))))));
- lines--, b++) {
- last = b;
- if (b[0] == '\r' && b[1] == '\n')
- b++;
- }
- if (lines)
- last = RCAST(const char *, s) + nbytes;
- ms->search.s = buf;
- ms->search.s_len = last - buf;
- ms->search.offset = offset;
- ms->search.rm_len = 0;
- return 0;
- }
- case FILE_BESTRING16:
- case FILE_LESTRING16: {
- const unsigned char *src = s + offset;
- const unsigned char *esrc = s + nbytes;
- char *dst = p->s;
- char *edst = &p->s[sizeof(p->s) - 1];
- if (type == FILE_BESTRING16)
- src++;
- /* check 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, int recursion_level, int *printed_something,
- int *need_separator, int *returnval)
- {
- uint32_t soffset, offset = ms->offset;
- uint32_t count = m->str_range;
- int rv, oneed_separator, in_type;
- char *sbuf, *rbuf;
- union VALUETYPE *p = &ms->ms_value;
- struct mlist ml;
- if (recursion_level >= 20) {
- file_error(ms, 0, "recursion nesting exceeded");
- return -1;
- }
- if (mcopy(ms, p, m->type, m->flag & INDIR, s, (uint32_t)(offset + o),
- (uint32_t)nbytes, count) == -1)
- return -1;
- if ((ms->flags & MAGIC_DEBUG) != 0) {
- fprintf(stderr, "mget(type=%d, flag=%x, offset=%u, o=%zu, "
- "nbytes=%zu, count=%u)\n", m->type, m->flag, offset, o,
- nbytes, 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)));
- 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)((q->hs[0]<<8)|(q->hs[1]));
- break;
- case FILE_LESHORT:
- off = (short)((q->hs[1]<<8)|(q->hs[0]));
- break;
- case FILE_LONG:
- off = q->l;
- break;
- case FILE_BELONG:
- case FILE_BEID3:
- off = (int32_t)((q->hl[0]<<24)|(q->hl[1]<<16)|
- (q->hl[2]<<8)|(q->hl[3]));
- break;
- case FILE_LEID3:
- case FILE_LELONG:
- off = (int32_t)((q->hl[3]<<24)|(q->hl[2]<<16)|
- (q->hl[1]<<8)|(q->hl[0]));
- break;
- case FILE_MELONG:
- off = (int32_t)((q->hl[1]<<24)|(q->hl[0]<<16)|
- (q->hl[3]<<8)|(q->hl[2]));
- 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;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) &
- off;
- break;
- case FILE_OPOR:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) |
- off;
- break;
- case FILE_OPXOR:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) ^
- off;
- break;
- case FILE_OPADD:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) +
- off;
- break;
- case FILE_OPMINUS:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) -
- off;
- break;
- case FILE_OPMULTIPLY:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) *
- off;
- break;
- case FILE_OPDIVIDE:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) /
- off;
- break;
- case FILE_OPMODULO:
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1])) %
- off;
- break;
- }
- } else
- offset = (short)((p->hs[0]<<8)|
- (p->hs[1]));
- if (m->in_op & FILE_OPINVERSE)
- offset = ~offset;
- break;
- case FILE_LESHORT:
- if (OFFSET_OOB(nbytes, offset, 2))
- return 0;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) &
- off;
- break;
- case FILE_OPOR:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) |
- off;
- break;
- case FILE_OPXOR:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) ^
- off;
- break;
- case FILE_OPADD:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) +
- off;
- break;
- case FILE_OPMINUS:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) -
- off;
- break;
- case FILE_OPMULTIPLY:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) *
- off;
- break;
- case FILE_OPDIVIDE:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) /
- off;
- break;
- case FILE_OPMODULO:
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0])) %
- off;
- break;
- }
- } else
- offset = (short)((p->hs[1]<<8)|
- (p->hs[0]));
- 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;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) &
- off;
- break;
- case FILE_OPOR:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) |
- off;
- break;
- case FILE_OPXOR:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) ^
- off;
- break;
- case FILE_OPADD:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) +
- off;
- break;
- case FILE_OPMINUS:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) -
- off;
- break;
- case FILE_OPMULTIPLY:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) *
- off;
- break;
- case FILE_OPDIVIDE:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) /
- off;
- break;
- case FILE_OPMODULO:
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3])) %
- off;
- break;
- }
- } else
- offset = (int32_t)((p->hl[0]<<24)|
- (p->hl[1]<<16)|
- (p->hl[2]<<8)|
- (p->hl[3]));
- if (m->in_op & FILE_OPINVERSE)
- offset = ~offset;
- break;
- case FILE_LELONG:
- case FILE_LEID3:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) &
- off;
- break;
- case FILE_OPOR:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) |
- off;
- break;
- case FILE_OPXOR:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) ^
- off;
- break;
- case FILE_OPADD:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) +
- off;
- break;
- case FILE_OPMINUS:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) -
- off;
- break;
- case FILE_OPMULTIPLY:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) *
- off;
- break;
- case FILE_OPDIVIDE:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) /
- off;
- break;
- case FILE_OPMODULO:
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0])) %
- off;
- break;
- }
- } else
- offset = (int32_t)((p->hl[3]<<24)|
- (p->hl[2]<<16)|
- (p->hl[1]<<8)|
- (p->hl[0]));
- if (m->in_op & FILE_OPINVERSE)
- offset = ~offset;
- break;
- case FILE_MELONG:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) &
- off;
- break;
- case FILE_OPOR:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) |
- off;
- break;
- case FILE_OPXOR:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) ^
- off;
- break;
- case FILE_OPADD:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) +
- off;
- break;
- case FILE_OPMINUS:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) -
- off;
- break;
- case FILE_OPMULTIPLY:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) *
- off;
- break;
- case FILE_OPDIVIDE:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) /
- off;
- break;
- case FILE_OPMODULO:
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2])) %
- off;
- break;
- }
- } else
- offset = (int32_t)((p->hl[1]<<24)|
- (p->hl[0]<<16)|
- (p->hl[3]<<8)|
- (p->hl[2]));
- 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;
- }
- switch (in_type) {
- case FILE_LEID3:
- case FILE_BEID3:
- offset = ((((offset >> 0) & 0x7f) << 0) |
- (((offset >> 8) & 0x7f) << 7) |
- (((offset >> 16) & 0x7f) << 14) |
- (((offset >> 24) & 0x7f) << 21)) + 10;
- 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, count) == -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 (offset == 0)
- return 0;
- if (nbytes < offset)
- return 0;
- sbuf = ms->o.buf;
- soffset = ms->offset;
- ms->o.buf = NULL;
- ms->offset = 0;
- rv = file_softmagic(ms, s + offset, nbytes - offset,
- recursion_level, BINTEST, text);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
- rbuf = ms->o.buf;
- ms->o.buf = sbuf;
- ms->offset = soffset;
- if (rv == 1) {
- if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 &&
- file_printf(ms, F(m->desc, "%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;
- sbuf = m->value.s;
- if (*sbuf == '^') {
- sbuf++;
- flip = !flip;
- }
- if (file_magicfind(ms, sbuf, &ml) == -1) {
- file_error(ms, 0, "cannot find entry `%s'", sbuf);
- return -1;
- }
- 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, recursion_level, printed_something,
- need_separator, returnval);
- if (rv != 1)
- *need_separator = oneed_separator;
- return rv;
- case FILE_NAME:
- if (file_printf(ms, "%s", m->desc) == -1)
- return -1;
- return 1;
- 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;
- char *old_lc_ctype;
- 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:
- matched = 0;
- 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:
- matched = 0;
- 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;
- break;
- }
- }
- break;
- }
- case FILE_REGEX: {
- int rc;
- regex_t rx;
- char errmsg[512];
- if (ms->search.s == NULL)
- return 0;
- old_lc_ctype = setlocale(LC_CTYPE, NULL);
- assert(old_lc_ctype != NULL);
- old_lc_ctype = strdup(old_lc_ctype);
- assert(old_lc_ctype != NULL);
- (void)setlocale(LC_CTYPE, "C");
- l = 0;
- rc = regcomp(&rx, m->value.s,
- REG_EXTENDED|REG_NEWLINE|
- ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0));
- if (rc) {
- (void)regerror(rc, &rx, errmsg, sizeof(errmsg));
- file_magerror(ms, "regex error %d, (%s)",
- rc, errmsg);
- v = (uint64_t)-1;
- }
- else {
- regmatch_t pmatch[1];
- #ifndef REG_STARTEND
- #define REG_STARTEND 0
- size_t l = ms->search.s_len - 1;
- char c = ms->search.s[l];
- ((char *)(intptr_t)ms->search.s)[l] = '\0';
- #else
- pmatch[0].rm_so = 0;
- pmatch[0].rm_eo = ms->search.s_len;
- #endif
- rc = regexec(&rx, (const char *)ms->search.s,
- 1, pmatch, REG_STARTEND);
- #if REG_STARTEND == 0
- ((char *)(intptr_t)ms->search.s)[l] = c;
- #endif
- switch (rc) {
- case 0:
- ms->search.s += (int)pmatch[0].rm_so;
- ms->search.offset += (size_t)pmatch[0].rm_so;
- ms->search.rm_len =
- (size_t)(pmatch[0].rm_eo - pmatch[0].rm_so);
- v = 0;
- break;
- case REG_NOMATCH:
- v = 1;
- break;
- default:
- (void)regerror(rc, &rx, errmsg, sizeof(errmsg));
- file_magerror(ms, "regexec error %d, (%s)",
- rc, errmsg);
- v = (uint64_t)-1;
- break;
- }
- regfree(&rx);
- }
- (void)setlocale(LC_CTYPE, old_lc_ctype);
- free(old_lc_ctype);
- if (v == (uint64_t)-1)
- return -1;
- break;
- }
- case FILE_INDIRECT:
- case FILE_USE:
- case FILE_NAME:
- return 1;
- 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:
- matched = 0;
- 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) {
- if (file_printf(ms, "%.8s", m->apple) == -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_MIME)
- return 0;
- if (firstline)
- return 0;
- /*
- * we found another match
- * put a newline and '-' to do some simple formatting
- */
- return file_printf(ms, "\n- ");
- }
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