Adding upstream version 1:5.44.upstream/1%5.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 395 insertions, 0 deletions

diff --git a/src/ascmagic.c b/src/ascmagic.c
new file mode 100644
index 0000000..487f55d
--- /dev/null
+++ b/src/ascmagic.c
@@ -0,0 +1,395 @@
+/*
+ * 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.
+ */
+/*
+ * ASCII magic -- try to detect text encoding.
+ *
+ * Extensively modified by Eric Fischer <enf@pobox.com> in July, 2000,
+ * to handle character codes other than ASCII on a unified basis.
+ */
+
+#include "file.h"
+
+#ifndef	lint
+FILE_RCSID("@(#)$File: ascmagic.c,v 1.113 2022/12/26 17:31:14 christos Exp $")
+#endif	/* lint */
+
+#include "magic.h"
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#define MAXLINELEN 300	/* longest sane line length */
+#define ISSPC(x) ((x) == ' ' || (x) == '\t' || (x) == '\r' || (x) == '\n' \
+		  || (x) == 0x85 || (x) == '\f')
+
+file_private unsigned char *encode_utf8(unsigned char *, size_t, file_unichar_t *,
+    size_t);
+file_private size_t trim_nuls(const unsigned char *, size_t);
+
+/*
+ * Undo the NUL-termination kindly provided by process()
+ * but leave at least one byte to look at
+ */
+file_private size_t
+trim_nuls(const unsigned char *buf, size_t nbytes)
+{
+	while (nbytes > 1 && buf[nbytes - 1] == '\0')
+		nbytes--;
+
+	return nbytes;
+}
+
+file_protected int
+file_ascmagic(struct magic_set *ms, const struct buffer *b, int text)
+{
+	file_unichar_t *ubuf = NULL;
+	size_t ulen = 0;
+	int rv = 1;
+	struct buffer bb;
+
+	const char *code = NULL;
+	const char *code_mime = NULL;
+	const char *type = NULL;
+
+	bb = *b;
+	bb.flen = trim_nuls(CAST(const unsigned char *, b->fbuf), b->flen);
+	/*
+	 * Avoid trimming at an odd byte if the original buffer was evenly
+	 * sized; this avoids losing the last character on UTF-16 LE text
+	 */
+	if ((bb.flen & 1) && !(b->flen & 1))
+		bb.flen++;
+
+	/* If file doesn't look like any sort of text, give up. */
+	if (file_encoding(ms, &bb, &ubuf, &ulen, &code, &code_mime,
+	    &type) == 0)
+		rv = 0;
+        else
+		rv = file_ascmagic_with_encoding(ms, &bb,
+		    ubuf, ulen, code, type, text);
+
+	free(ubuf);
+
+	return rv;
+}
+
+file_protected int
+file_ascmagic_with_encoding(struct magic_set *ms, const struct buffer *b,
+    file_unichar_t *ubuf, size_t ulen, const char *code, const char *type,
+    int text)
+{
+	struct buffer bb;
+	const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
+	size_t nbytes = b->flen;
+	unsigned char *utf8_buf = NULL, *utf8_end;
+	size_t mlen, i, len;
+	int rv = -1;
+	int mime = ms->flags & MAGIC_MIME;
+	int need_separator = 0;
+
+	const char *subtype = NULL;
+
+	int has_escapes = 0;
+	int has_backspace = 0;
+	int seen_cr = 0;
+
+	int n_crlf = 0;
+	int n_lf = 0;
+	int n_cr = 0;
+	int n_nel = 0;
+	int executable = 0;
+
+	size_t last_line_end = CAST(size_t, -1);
+	size_t has_long_lines = 0;
+
+	nbytes = trim_nuls(buf, nbytes);
+
+	/* If we have fewer than 2 bytes, give up. */
+	if (nbytes <= 1) {
+		rv = 0;
+		goto done;
+	}
+
+	if (ulen > 0 && (ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
+		/* Convert ubuf to UTF-8 and try text soft magic */
+		/* malloc size is a conservative overestimate; could be
+		   improved, or at least realloced after conversion. */
+		mlen = ulen * 6;
+		if ((utf8_buf = CAST(unsigned char *, malloc(mlen))) == NULL) {
+			file_oomem(ms, mlen);
+			goto done;
+		}
+		if ((utf8_end = encode_utf8(utf8_buf, mlen, ubuf, ulen))
+		    == NULL)
+			goto done;
+		buffer_init(&bb, b->fd, &b->st, utf8_buf,
+		    CAST(size_t, utf8_end - utf8_buf));
+
+		if ((rv = file_softmagic(ms, &bb, NULL, NULL,
+		    TEXTTEST, text)) == 0)
+			rv = -1;
+		else
+			need_separator = 1;
+		buffer_fini(&bb);
+		if ((ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))) {
+			rv = rv == -1 ? 0 : 1;
+			goto done;
+		}
+	}
+
+	if ((ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))) {
+		rv = 0;
+		goto done;
+	}
+
+	/* Now try to discover other details about the file. */
+	for (i = 0; i < ulen; i++) {
+		if (ubuf[i] == '\n') {
+			if (seen_cr)
+				n_crlf++;
+			else
+				n_lf++;
+			last_line_end = i;
+		} else if (seen_cr)
+			n_cr++;
+
+		seen_cr = (ubuf[i] == '\r');
+		if (seen_cr)
+			last_line_end = i;
+
+		if (ubuf[i] == 0x85) { /* X3.64/ECMA-43 "next line" character */
+			n_nel++;
+			last_line_end = i;
+		}
+
+		/* If this line is _longer_ than MAXLINELEN, remember it. */
+		if (i > last_line_end + MAXLINELEN) {
+			size_t ll = i - last_line_end;
+			if (ll > has_long_lines)
+				has_long_lines = ll;
+		}
+
+		if (ubuf[i] == '\033')
+			has_escapes = 1;
+		if (ubuf[i] == '\b')
+			has_backspace = 1;
+	}
+
+	/* Beware, if the data has been truncated, the final CR could have
+	   been followed by a LF.  If we have ms->bytes_max bytes, it indicates
+	   that the data might have been truncated, probably even before
+	   this function was called. */
+	if (seen_cr && nbytes < ms->bytes_max)
+		n_cr++;
+
+	if (strcmp(type, "binary") == 0) {
+		rv = 0;
+		goto done;
+	}
+	len = file_printedlen(ms);
+	if (mime) {
+		if ((mime & MAGIC_MIME_TYPE) != 0) {
+			if (len) {
+				/*
+				 * Softmagic printed something, we
+				 * are either done, or we need a separator
+				 */
+				if ((ms->flags & MAGIC_CONTINUE) == 0) {
+					rv = 1;
+					goto done;
+				}
+				if (need_separator && file_separator(ms) == -1)
+					goto done;
+			} else {
+				if (file_printf(ms, "text/plain") == -1)
+					goto done;
+			}
+		}
+	} else {
+		if (len) {
+			switch (file_replace(ms, " text$", ", ")) {
+			case 0:
+				switch (file_replace(ms, " text executable$",
+				    ", ")) {
+				case 0:
+					if (file_printf(ms, ", ") == -1)
+						goto done;
+					break;
+				case -1:
+					goto done;
+				default:
+					executable = 1;
+					break;
+				}
+				break;
+			case -1:
+				goto done;
+			default:
+				break;
+			}
+		}
+
+		if (file_printf(ms, "%s", code) == -1)
+			goto done;
+
+		if (subtype) {
+			if (file_printf(ms, " %s", subtype) == -1)
+				goto done;
+		}
+
+		if (file_printf(ms, " %s", type) == -1)
+			goto done;
+
+		if (executable)
+			if (file_printf(ms, " executable") == -1)
+				goto done;
+
+		if (has_long_lines)
+			if (file_printf(ms, ", with very long lines (%"
+			    SIZE_T_FORMAT "u)", has_long_lines) == -1)
+				goto done;
+
+		/*
+		 * Only report line terminators if we find one other than LF,
+		 * or if we find none at all.
+		 */
+		if ((n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) ||
+		    (n_crlf != 0 || n_cr != 0 || n_nel != 0)) {
+			if (file_printf(ms, ", with") == -1)
+				goto done;
+
+			if (n_crlf == 0 && n_cr == 0 &&
+			    n_nel == 0 && n_lf == 0) {
+				if (file_printf(ms, " no") == -1)
+					goto done;
+			} else {
+				if (n_crlf) {
+					if (file_printf(ms, " CRLF") == -1)
+						goto done;
+					if (n_cr || n_lf || n_nel)
+						if (file_printf(ms, ",") == -1)
+							goto done;
+				}
+				if (n_cr) {
+					if (file_printf(ms, " CR") == -1)
+						goto done;
+					if (n_lf || n_nel)
+						if (file_printf(ms, ",") == -1)
+							goto done;
+				}
+				if (n_lf) {
+					if (file_printf(ms, " LF") == -1)
+						goto done;
+					if (n_nel)
+						if (file_printf(ms, ",") == -1)
+							goto done;
+				}
+				if (n_nel)
+					if (file_printf(ms, " NEL") == -1)
+						goto done;
+			}
+
+			if (file_printf(ms, " line terminators") == -1)
+				goto done;
+		}
+
+		if (has_escapes)
+			if (file_printf(ms, ", with escape sequences") == -1)
+				goto done;
+		if (has_backspace)
+			if (file_printf(ms, ", with overstriking") == -1)
+				goto done;
+	}
+	rv = 1;
+done:
+	free(utf8_buf);
+
+	return rv;
+}
+
+/*
+ * Encode Unicode string as UTF-8, returning pointer to character
+ * after end of string, or NULL if an invalid character is found.
+ */
+file_private unsigned char *
+encode_utf8(unsigned char *buf, size_t len, file_unichar_t *ubuf, size_t ulen)
+{
+	size_t i;
+	unsigned char *end = buf + len;
+
+	for (i = 0; i < ulen; i++) {
+		if (ubuf[i] <= 0x7f) {
+			if (end - buf < 1)
+				return NULL;
+			*buf++ = CAST(unsigned char, ubuf[i]);
+			continue;
+		} 
+		if (ubuf[i] <= 0x7ff) {
+			if (end - buf < 2)
+				return NULL;
+			*buf++ = CAST(unsigned char, (ubuf[i] >> 6) + 0xc0);
+			goto out1;
+		}
+		if (ubuf[i] <= 0xffff) {
+			if (end - buf < 3)
+				return NULL;
+			*buf++ = CAST(unsigned char, (ubuf[i] >> 12) + 0xe0);
+			goto out2;
+		}
+		if (ubuf[i] <= 0x1fffff) {
+			if (end - buf < 4)
+				return NULL;
+			*buf++ = CAST(unsigned char, (ubuf[i] >> 18) + 0xf0);
+			goto out3;
+		}
+		if (ubuf[i] <= 0x3ffffff) {
+			if (end - buf < 5)
+				return NULL;
+			*buf++ = CAST(unsigned char, (ubuf[i] >> 24) + 0xf8);
+			goto out4;
+		} 
+		if (ubuf[i] <= 0x7fffffff) {
+			if (end - buf < 6)
+				return NULL;
+			*buf++ = CAST(unsigned char, (ubuf[i] >> 30) + 0xfc);
+			goto out5;
+		} 
+		/* Invalid character */
+		return NULL;
+	out5:	*buf++ = CAST(unsigned char, ((ubuf[i] >> 24) & 0x3f) + 0x80);
+	out4:	*buf++ = CAST(unsigned char, ((ubuf[i] >> 18) & 0x3f) + 0x80);
+	out3:	*buf++ = CAST(unsigned char, ((ubuf[i] >> 12) & 0x3f) + 0x80);
+	out2:	*buf++ = CAST(unsigned char, ((ubuf[i] >>  6) & 0x3f) + 0x80);
+	out1:	*buf++ = CAST(unsigned char, ((ubuf[i] >>  0) & 0x3f) + 0x80);
+	}
+
+	return buf;
+}