Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 228 insertions, 0 deletions

diff --git a/src/util/base64_code.c b/src/util/base64_code.c
new file mode 100644
index 0000000..e607218
--- /dev/null
+++ b/src/util/base64_code.c
@@ -0,0 +1,228 @@
+/*++
+/* NAME
+/*	base64_code 3
+/* SUMMARY
+/*	encode/decode data, base 64 style
+/* SYNOPSIS
+/*	#include <base64_code.h>
+/*
+/*	VSTRING	*base64_encode(result, in, len)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/*
+/*	VSTRING	*base64_decode(result, in, len)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/*
+/*	VSTRING	*base64_encode_opt(result, in, len, flags)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/*	int	flags;
+/*
+/*	VSTRING	*base64_decode_opt(result, in, len, flags)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/*	int	flags;
+/* DESCRIPTION
+/*	base64_encode() takes a block of len bytes and encodes it as one
+/*	null-terminated string.  The result value is the result argument.
+/*
+/*	base64_decode() performs the opposite transformation. The result
+/*	value is the result argument. The result is null terminated, whether
+/*	or not that makes sense.
+/*
+/*	base64_encode_opt() and base64_decode_opt() provide extended
+/*	interfaces.  In both cases the flags arguments is the bit-wise
+/*	OR of zero or more the following:
+/* .IP BASE64_FLAG_APPEND
+/*	Append the result, instead of overwriting the result buffer.
+/* .PP
+/*	For convenience, BASE64_FLAG_NONE specifies none of the above.
+/* DIAGNOSTICS
+/*	base64_decode () returns a null pointer when the input contains
+/*	characters not in the base 64 alphabet.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+
+#ifndef UCHAR_MAX
+#define UCHAR_MAX 0xff
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <base64_code.h>
+
+/* Application-specific. */
+
+static unsigned char to_b64[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+#define UNSIG_CHAR_PTR(x) ((unsigned char *)(x))
+
+/* base64_encode - raw data to encoded */
+
+#undef base64_encode
+
+extern VSTRING *base64_encode(VSTRING *, const char *, ssize_t);
+
+VSTRING *base64_encode(VSTRING *result, const char *in, ssize_t len)
+{
+    return (base64_encode_opt(result, in, len, BASE64_FLAG_NONE));
+}
+
+VSTRING *base64_encode_opt(VSTRING *result, const char *in, ssize_t len,
+			           int flags)
+{
+    const unsigned char *cp;
+    ssize_t count;
+
+    /*
+     * Encode 3 -> 4.
+     */
+    if ((flags & BASE64_FLAG_APPEND) == 0)
+	VSTRING_RESET(result);
+    for (cp = UNSIG_CHAR_PTR(in), count = len; count > 0; count -= 3, cp += 3) {
+	VSTRING_ADDCH(result, to_b64[cp[0] >> 2]);
+	if (count > 1) {
+	    VSTRING_ADDCH(result, to_b64[(cp[0] & 0x3) << 4 | cp[1] >> 4]);
+	    if (count > 2) {
+		VSTRING_ADDCH(result, to_b64[(cp[1] & 0xf) << 2 | cp[2] >> 6]);
+		VSTRING_ADDCH(result, to_b64[cp[2] & 0x3f]);
+	    } else {
+		VSTRING_ADDCH(result, to_b64[(cp[1] & 0xf) << 2]);
+		VSTRING_ADDCH(result, '=');
+		break;
+	    }
+	} else {
+	    VSTRING_ADDCH(result, to_b64[(cp[0] & 0x3) << 4]);
+	    VSTRING_ADDCH(result, '=');
+	    VSTRING_ADDCH(result, '=');
+	    break;
+	}
+    }
+    VSTRING_TERMINATE(result);
+    return (result);
+}
+
+/* base64_decode - encoded data to raw */
+
+#undef base64_decode
+
+extern VSTRING *base64_decode(VSTRING *, const char *, ssize_t);
+
+VSTRING *base64_decode(VSTRING *result, const char *in, ssize_t len)
+{
+    return (base64_decode_opt(result, in, len, BASE64_FLAG_NONE));
+}
+
+VSTRING *base64_decode_opt(VSTRING *result, const char *in, ssize_t len,
+			           int flags)
+{
+    static unsigned char *un_b64 = 0;
+    const unsigned char *cp;
+    ssize_t count;
+    unsigned int ch0;
+    unsigned int ch1;
+    unsigned int ch2;
+    unsigned int ch3;
+
+#define CHARS_PER_BYTE	(UCHAR_MAX + 1)
+#define INVALID		0xff
+
+    /*
+     * Sanity check.
+     */
+    if (len % 4)
+	return (0);
+
+    /*
+     * Once: initialize the decoding lookup table on the fly.
+     */
+    if (un_b64 == 0) {
+	un_b64 = (unsigned char *) mymalloc(CHARS_PER_BYTE);
+	memset(un_b64, INVALID, CHARS_PER_BYTE);
+	for (cp = to_b64; cp < to_b64 + sizeof(to_b64) - 1; cp++)
+	    un_b64[*cp] = cp - to_b64;
+    }
+
+    /*
+     * Decode 4 -> 3.
+     */
+    if ((flags & BASE64_FLAG_APPEND) == 0)
+	VSTRING_RESET(result);
+    for (cp = UNSIG_CHAR_PTR(in), count = 0; count < len; count += 4) {
+	if ((ch0 = un_b64[*cp++]) == INVALID
+	    || (ch1 = un_b64[*cp++]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch0 << 2 | ch1 >> 4);
+	if ((ch2 = *cp++) == '=')
+	    break;
+	if ((ch2 = un_b64[ch2]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch1 << 4 | ch2 >> 2);
+	if ((ch3 = *cp++) == '=')
+	    break;
+	if ((ch3 = un_b64[ch3]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch2 << 6 | ch3);
+    }
+    VSTRING_TERMINATE(result);
+    return (result);
+}
+
+#ifdef TEST
+
+ /*
+  * Proof-of-concept test program: convert to base 64 and back.
+  */
+
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+int     main(int unused_argc, char **unused_argv)
+{
+    VSTRING *b1 = vstring_alloc(1);
+    VSTRING *b2 = vstring_alloc(1);
+    char    test[256];
+    int     n;
+
+    for (n = 0; n < sizeof(test); n++)
+	test[n] = n;
+    base64_encode(b1, test, sizeof(test));
+    if (base64_decode(b2, STR(b1), LEN(b1)) == 0)
+	msg_panic("bad base64: %s", STR(b1));
+    if (LEN(b2) != sizeof(test))
+	msg_panic("bad decode length: %ld != %ld",
+		  (long) LEN(b2), (long) sizeof(test));
+    for (n = 0; n < sizeof(test); n++)
+	if (STR(b2)[n] != test[n])
+	    msg_panic("bad decode value %d != %d",
+		      (unsigned char) STR(b2)[n], (unsigned char) test[n]);
+    vstring_free(b1);
+    vstring_free(b2);
+    return (0);
+}
+
+#endif