Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 278 insertions, 0 deletions

diff --git a/src/global/uxtext.c b/src/global/uxtext.c
new file mode 100644
index 0000000..6dfe94c
--- /dev/null
+++ b/src/global/uxtext.c
@@ -0,0 +1,278 @@
+/*++
+/* NAME
+/*	uxtext 3
+/* SUMMARY
+/*	quote/unquote text, xtext style.
+/* SYNOPSIS
+/*	#include <uxtext.h>
+/*
+/*	VSTRING	*uxtext_quote(quoted, unquoted, special)
+/*	VSTRING	*quoted;
+/*	const char *unquoted;
+/*	const char *special;
+/*
+/*	VSTRING	*uxtext_quote_append(unquoted, quoted, special)
+/*	VSTRING	*unquoted;
+/*	const char *quoted;
+/*	const char *special;
+/*
+/*	VSTRING	*uxtext_unquote(unquoted, quoted)
+/*	VSTRING	*unquoted;
+/*	const char *quoted;
+/*
+/*	VSTRING	*uxtext_unquote_append(unquoted, quoted)
+/*	VSTRING	*unquoted;
+/*	const char *quoted;
+/* DESCRIPTION
+/*	uxtext_quote() takes a null-terminated UTF8 string and
+/*	replaces characters \, <33(10) and >126(10), as well as
+/*	characters specified with "special" with \x{XX}, XX being
+/*	a 2-6-digit uppercase hexadecimal equivalent.
+/*
+/*	uxtext_quote_append() is like uxtext_quote(), but appends
+/*	the conversion result to the result buffer.
+/*
+/*	uxtext_unquote() performs the opposite transformation. This
+/*	function understands lowercase, uppercase, and mixed case
+/*	\x{XX...} sequences.  The result value is the unquoted
+/*	argument in case of success, a null pointer otherwise.
+/*
+/*	uxtext_unquote_append() is like uxtext_unquote(), but appends
+/*	the conversion result to the result buffer.
+/* BUGS
+/*	This module cannot process null characters in data.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Arnt Gulbrandsen
+/*
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "vstring.h"
+#include "uxtext.h"
+
+/* Application-specific. */
+
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+/* uxtext_quote_append - append unquoted data to quoted data */
+
+VSTRING *uxtext_quote_append(VSTRING *quoted, const char *unquoted,
+			             const char *special)
+{
+    unsigned const char *cp;
+    int     ch;
+
+    for (cp = (unsigned const char *) unquoted; (ch = *cp) != 0; cp++) {
+	/* Fix 20140709: the '\' character must always be quoted. */
+	if (ch != '\\' && ch > 32 && ch < 127
+	    && (*special == 0 || strchr(special, ch) == 0)) {
+	    VSTRING_ADDCH(quoted, ch);
+	} else {
+
+	    /*
+	     * had RFC6533 been written like 6531 and 6532, this else clause
+	     * would be one line long.
+	     */
+	    int     unicode = 0;
+	    int     pick = 0;
+
+	    if (ch < 0x80) {
+		//0000 0000 - 0000 007 F 0x xxxxxx
+		    unicode = ch;
+	    } else if ((ch & 0xe0) == 0xc0) {
+		//0000 0080 - 0000 07 FF 110 xxxxx 10 xxxxxx
+		    unicode = (ch & 0x1f);
+		pick = 1;
+	    } else if ((ch & 0xf0) == 0xe0) {
+		//0000 0800 - 0000 FFFF 1110 xxxx 10 xxxxxx 10 xxxxxx
+		    unicode = (ch & 0x0f);
+		pick = 2;
+	    } else if ((ch & 0xf8) == 0xf0) {
+		//0001 0000 - 001 F FFFF 11110 xxx 10 xxxxxx 10 xxxxxx 10 xxxxxx
+		    unicode = (ch & 0x07);
+		pick = 3;
+	    } else if ((ch & 0xfc) == 0xf8) {
+		//0020 0000 - 03 FF FFFF 111110 xx 10 xxxxxx 10 xxxxxx...10 xxxxxx
+		    unicode = (ch & 0x03);
+		pick = 4;
+	    } else if ((ch & 0xfe) == 0xfc) {
+		//0400 0000 - 7 FFF FFFF 1111110 x 10 xxxxxx...10 xxxxxx
+		    unicode = (ch & 0x01);
+		pick = 5;
+	    } else {
+		return (0);
+	    }
+	    while (pick > 0) {
+		ch = *++cp;
+		if ((ch & 0xc0) != 0x80)
+		    return (0);
+		unicode = unicode << 6 | (ch & 0x3f);
+		pick--;
+	    }
+	    vstring_sprintf_append(quoted, "\\x{%02X}", unicode);
+	}
+    }
+    VSTRING_TERMINATE(quoted);
+    return (quoted);
+}
+
+/* uxtext_quote - unquoted data to quoted */
+
+VSTRING *uxtext_quote(VSTRING *quoted, const char *unquoted, const char *special)
+{
+    VSTRING_RESET(quoted);
+    uxtext_quote_append(quoted, unquoted, special);
+    return (quoted);
+}
+
+/* uxtext_unquote_append - quoted data to unquoted */
+
+VSTRING *uxtext_unquote_append(VSTRING *unquoted, const char *quoted)
+{
+    const unsigned char *cp;
+    int     ch;
+
+    for (cp = (const unsigned char *) quoted; (ch = *cp) != 0; cp++) {
+	if (ch == '\\' && cp[1] == 'x' && cp[2] == '{') {
+	    int     unicode = 0;
+
+	    cp += 2;
+	    while ((ch = *++cp) != '}') {
+		if (ISDIGIT(ch))
+		    unicode = (unicode << 4) + (ch - '0');
+		else if (ch >= 'a' && ch <= 'f')
+		    unicode = (unicode << 4) + (ch - 'a' + 10);
+		else if (ch >= 'A' && ch <= 'F')
+		    unicode = (unicode << 4) + (ch - 'A' + 10);
+		else
+		    return (0);			/* also covers the null
+						 * terminator */
+		if (unicode > 0x10ffff)
+		    return (0);
+	    }
+
+	    /*
+	     * the following block is from
+	     * https://github.com/aox/aox/blob/master/encodings/utf.cpp, with
+	     * permission by the authors.
+	     */
+	    if (unicode < 0x80) {
+		VSTRING_ADDCH(unquoted, (char) unicode);
+	    } else if (unicode < 0x800) {
+		VSTRING_ADDCH(unquoted, 0xc0 | ((char) (unicode >> 6)));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode & 0x3f)));
+	    } else if (unicode < 0x10000) {
+		VSTRING_ADDCH(unquoted, 0xe0 | ((char) (unicode >> 12)));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 6) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode & 0x3f)));
+	    } else if (unicode < 0x200000) {
+		VSTRING_ADDCH(unquoted, 0xf0 | ((char) (unicode >> 18)));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 12) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 6) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode & 0x3f)));
+	    } else if (unicode < 0x4000000) {
+		VSTRING_ADDCH(unquoted, 0xf8 | ((char) (unicode >> 24)));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 18) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 12) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 6) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode & 0x3f)));
+	    } else {
+		VSTRING_ADDCH(unquoted, 0xfc | ((char) (unicode >> 30)));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 24) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 18) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 12) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode >> 6) & 0x3f));
+		VSTRING_ADDCH(unquoted, 0x80 | ((char) (unicode & 0x3f)));
+	    }
+	} else {
+	    VSTRING_ADDCH(unquoted, ch);
+	}
+    }
+    VSTRING_TERMINATE(unquoted);
+    return (unquoted);
+}
+
+/* uxtext_unquote - quoted data to unquoted */
+
+VSTRING *uxtext_unquote(VSTRING *unquoted, const char *quoted)
+{
+    VSTRING_RESET(unquoted);
+    return (uxtext_unquote_append(unquoted, quoted) ? unquoted : 0);
+}
+
+#ifdef TEST
+
+ /*
+  * Proof-of-concept test program: convert to quoted and back.
+  */
+#include <vstream.h>
+
+#define BUFLEN 1024
+
+static ssize_t read_buf(VSTREAM *fp, VSTRING *buf)
+{
+    ssize_t len;
+
+    len = vstream_fread_buf(fp, buf, BUFLEN);
+    VSTRING_TERMINATE(buf);
+    return (len);
+}
+
+int     main(int unused_argc, char **unused_argv)
+{
+    VSTRING *unquoted = vstring_alloc(BUFLEN);
+    VSTRING *quoted = vstring_alloc(100);
+    ssize_t len;
+
+    /*
+     * Negative tests.
+     */
+    if (uxtext_unquote(unquoted, "\\x{x1}") != 0)
+	msg_warn("undetected error pattern 1");
+    if (uxtext_unquote(unquoted, "\\x{2x}") != 0)
+	msg_warn("undetected error pattern 2");
+    if (uxtext_unquote(unquoted, "\\x{33") != 0)
+	msg_warn("undetected error pattern 3");
+
+    /*
+     * Positive tests.
+     */
+    while ((len = read_buf(VSTREAM_IN, unquoted)) > 0) {
+	uxtext_quote(quoted, STR(unquoted), "+=");
+	if (uxtext_unquote(unquoted, STR(quoted)) == 0)
+	    msg_fatal("bad input: %.100s", STR(quoted));
+	if (LEN(unquoted) != len)
+	    msg_fatal("len %ld != unquoted len %ld",
+		      (long) len, (long) LEN(unquoted));
+	if (vstream_fwrite(VSTREAM_OUT, STR(unquoted), LEN(unquoted)) != LEN(unquoted))
+	    msg_fatal("write error: %m");
+    }
+    vstream_fflush(VSTREAM_OUT);
+    vstring_free(unquoted);
+    vstring_free(quoted);
+    return (0);
+}
+
+#endif