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411e97c72d
yet unfinished port to libmagic 5.28 catch with missing libmagic port pieces regenerate data file with magic from 5.28 test magic files from 5.28 missing files fix path pure c99 is still not supported move right to 5.29, yet some bugs present more sync with orig lib more ZMM usage use unpatched data for now partial revert according to bug #67705 Revert "more ZMM usage" This reverts commit 5e3c9b851034b455942b219b18bdc49c8315c3ee. several fixes, so it's now closer to the clean port
362 lines
9.6 KiB
C
362 lines
9.6 KiB
C
/*
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* Copyright (c) Ian F. Darwin 1986-1995.
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* Software written by Ian F. Darwin and others;
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* maintained 1995-present by Christos Zoulas and others.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* ASCII magic -- try to detect text encoding.
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*
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* Extensively modified by Eric Fischer <enf@pobox.com> in July, 2000,
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* to handle character codes other than ASCII on a unified basis.
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*/
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#include "file.h"
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#ifndef lint
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FILE_RCSID("@(#)$File: ascmagic.c,v 1.97 2016/06/27 20:56:25 christos Exp $")
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#endif /* lint */
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#include "magic.h"
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#include <string.h>
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#include <memory.h>
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#include <ctype.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#define MAXLINELEN 300 /* longest sane line length */
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#define ISSPC(x) ((x) == ' ' || (x) == '\t' || (x) == '\r' || (x) == '\n' \
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|| (x) == 0x85 || (x) == '\f')
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private unsigned char *encode_utf8(unsigned char *, size_t, unichar *, size_t);
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private size_t trim_nuls(const unsigned char *, size_t);
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/*
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* Undo the NUL-termination kindly provided by process()
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* but leave at least one byte to look at
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*/
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private size_t
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trim_nuls(const unsigned char *buf, size_t nbytes)
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{
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while (nbytes > 1 && buf[nbytes - 1] == '\0')
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nbytes--;
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return nbytes;
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}
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protected int
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file_ascmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes,
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int text)
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{
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unichar *ubuf = NULL;
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size_t ulen = 0;
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int rv = 1;
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const char *code = NULL;
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const char *code_mime = NULL;
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const char *type = NULL;
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nbytes = trim_nuls(buf, nbytes);
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/* If file doesn't look like any sort of text, give up. */
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if (file_encoding(ms, buf, nbytes, &ubuf, &ulen, &code, &code_mime,
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&type) == 0)
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rv = 0;
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else
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rv = file_ascmagic_with_encoding(ms, buf, nbytes, ubuf, ulen, code,
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type, text);
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free(ubuf);
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return rv;
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}
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protected int
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file_ascmagic_with_encoding(struct magic_set *ms, const unsigned char *buf,
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size_t nbytes, unichar *ubuf, size_t ulen, const char *code,
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const char *type, int text)
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{
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unsigned char *utf8_buf = NULL, *utf8_end;
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size_t mlen, i;
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int rv = -1;
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int mime = ms->flags & MAGIC_MIME;
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const char *subtype = NULL;
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const char *subtype_mime = NULL;
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int has_escapes = 0;
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int has_backspace = 0;
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int seen_cr = 0;
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int n_crlf = 0;
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int n_lf = 0;
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int n_cr = 0;
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int n_nel = 0;
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int executable = 0;
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size_t last_line_end = (size_t)-1;
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int has_long_lines = 0;
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nbytes = trim_nuls(buf, nbytes);
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/* If we have fewer than 2 bytes, give up. */
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if (nbytes <= 1) {
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rv = 0;
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goto done;
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}
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if (ulen > 0 && (ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
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/* Convert ubuf to UTF-8 and try text soft magic */
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/* malloc size is a conservative overestimate; could be
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improved, or at least realloced after conversion. */
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mlen = ulen * 6;
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if ((utf8_buf = CAST(unsigned char *, emalloc(mlen))) == NULL) {
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file_oomem(ms, mlen);
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goto done;
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}
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if ((utf8_end = encode_utf8(utf8_buf, mlen, ubuf, ulen))
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== NULL)
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goto done;
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if ((rv = file_softmagic(ms, utf8_buf,
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(size_t)(utf8_end - utf8_buf), NULL, NULL,
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TEXTTEST, text)) == 0)
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rv = -1;
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if ((ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))) {
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rv = rv == -1 ? 0 : 1;
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goto done;
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}
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}
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if ((ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)))
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return 0;
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/* Now try to discover other details about the file. */
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for (i = 0; i < ulen; i++) {
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if (ubuf[i] == '\n') {
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if (seen_cr)
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n_crlf++;
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else
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n_lf++;
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last_line_end = i;
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} else if (seen_cr)
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n_cr++;
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seen_cr = (ubuf[i] == '\r');
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if (seen_cr)
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last_line_end = i;
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if (ubuf[i] == 0x85) { /* X3.64/ECMA-43 "next line" character */
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n_nel++;
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last_line_end = i;
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}
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/* If this line is _longer_ than MAXLINELEN, remember it. */
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if (i > last_line_end + MAXLINELEN)
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has_long_lines = 1;
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if (ubuf[i] == '\033')
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has_escapes = 1;
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if (ubuf[i] == '\b')
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has_backspace = 1;
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}
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/* Beware, if the data has been truncated, the final CR could have
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been followed by a LF. If we have ms->bytes_max bytes, it indicates
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that the data might have been truncated, probably even before
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this function was called. */
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if (seen_cr && nbytes < ms->bytes_max)
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n_cr++;
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if (strcmp(type, "binary") == 0) {
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rv = 0;
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goto done;
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}
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if (mime) {
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if (!file_printedlen(ms) && (mime & MAGIC_MIME_TYPE) != 0) {
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if (subtype_mime) {
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if (file_printf(ms, "%s", subtype_mime) == -1)
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goto done;
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} else {
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if (file_printf(ms, "text/plain") == -1)
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goto done;
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}
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}
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} else {
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if (file_printedlen(ms)) {
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switch (file_replace(ms, " text$", ", ")) {
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case 0:
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switch (file_replace(ms, " text executable$",
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", ")) {
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case 0:
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if (file_printf(ms, ", ") == -1)
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goto done;
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break;
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case -1:
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goto done;
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default:
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executable = 1;
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break;
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}
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break;
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case -1:
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goto done;
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default:
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break;
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}
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}
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if (file_printf(ms, "%s", code) == -1)
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goto done;
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if (subtype) {
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if (file_printf(ms, " %s", subtype) == -1)
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goto done;
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}
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if (file_printf(ms, " %s", type) == -1)
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goto done;
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if (executable)
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if (file_printf(ms, " executable") == -1)
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goto done;
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if (has_long_lines)
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if (file_printf(ms, ", with very long lines") == -1)
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goto done;
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/*
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* Only report line terminators if we find one other than LF,
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* or if we find none at all.
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*/
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if ((n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) ||
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(n_crlf != 0 || n_cr != 0 || n_nel != 0)) {
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if (file_printf(ms, ", with") == -1)
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goto done;
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if (n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) {
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if (file_printf(ms, " no") == -1)
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goto done;
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} else {
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if (n_crlf) {
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if (file_printf(ms, " CRLF") == -1)
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goto done;
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if (n_cr || n_lf || n_nel)
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if (file_printf(ms, ",") == -1)
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goto done;
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}
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if (n_cr) {
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if (file_printf(ms, " CR") == -1)
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goto done;
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if (n_lf || n_nel)
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if (file_printf(ms, ",") == -1)
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goto done;
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}
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if (n_lf) {
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if (file_printf(ms, " LF") == -1)
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goto done;
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if (n_nel)
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if (file_printf(ms, ",") == -1)
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goto done;
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}
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if (n_nel)
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if (file_printf(ms, " NEL") == -1)
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goto done;
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}
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if (file_printf(ms, " line terminators") == -1)
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goto done;
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}
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if (has_escapes)
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if (file_printf(ms, ", with escape sequences") == -1)
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goto done;
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if (has_backspace)
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if (file_printf(ms, ", with overstriking") == -1)
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goto done;
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}
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rv = 1;
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done:
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if (utf8_buf)
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efree(utf8_buf);
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return rv;
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}
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/*
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* Encode Unicode string as UTF-8, returning pointer to character
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* after end of string, or NULL if an invalid character is found.
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*/
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private unsigned char *
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encode_utf8(unsigned char *buf, size_t len, unichar *ubuf, size_t ulen)
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{
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size_t i;
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unsigned char *end = buf + len;
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for (i = 0; i < ulen; i++) {
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if (ubuf[i] <= 0x7f) {
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if (end - buf < 1)
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return NULL;
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*buf++ = (unsigned char)ubuf[i];
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} else if (ubuf[i] <= 0x7ff) {
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if (end - buf < 2)
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return NULL;
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*buf++ = (unsigned char)((ubuf[i] >> 6) + 0xc0);
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*buf++ = (unsigned char)((ubuf[i] & 0x3f) + 0x80);
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} else if (ubuf[i] <= 0xffff) {
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if (end - buf < 3)
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return NULL;
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*buf++ = (unsigned char)((ubuf[i] >> 12) + 0xe0);
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*buf++ = (unsigned char)(((ubuf[i] >> 6) & 0x3f) + 0x80);
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*buf++ = (unsigned char)((ubuf[i] & 0x3f) + 0x80);
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} else if (ubuf[i] <= 0x1fffff) {
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if (end - buf < 4)
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return NULL;
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*buf++ = (unsigned char)((ubuf[i] >> 18) + 0xf0);
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*buf++ = (unsigned char)(((ubuf[i] >> 12) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 6) & 0x3f) + 0x80);
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*buf++ = (unsigned char)((ubuf[i] & 0x3f) + 0x80);
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} else if (ubuf[i] <= 0x3ffffff) {
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if (end - buf < 5)
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return NULL;
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*buf++ = (unsigned char)((ubuf[i] >> 24) + 0xf8);
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*buf++ = (unsigned char)(((ubuf[i] >> 18) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 12) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 6) & 0x3f) + 0x80);
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*buf++ = (unsigned char)((ubuf[i] & 0x3f) + 0x80);
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} else if (ubuf[i] <= 0x7fffffff) {
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if (end - buf < 6)
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return NULL;
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*buf++ = (unsigned char)((ubuf[i] >> 30) + 0xfc);
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*buf++ = (unsigned char)(((ubuf[i] >> 24) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 18) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 12) & 0x3f) + 0x80);
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*buf++ = (unsigned char)(((ubuf[i] >> 6) & 0x3f) + 0x80);
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*buf++ = (unsigned char)((ubuf[i] & 0x3f) + 0x80);
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} else /* Invalid character */
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return NULL;
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}
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return buf;
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}
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