base64: Move base64 encoding support

2024-01-25 17:51:06 +01:00
parent 8d22b57969
commit 317df86ba3
10 changed files with 181 additions and 111 deletions
--- a/cpukit/base64/base64-encode.c
+++ b/cpukit/base64/base64-encode.c
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: ISC */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSImplBase64
+ *
+ * @brief This source file contains the implementation of
+ *   _Base64_Encode() and _Base64url_Encode().
+ */
+
+/*
+ * Copyright (C) 2020, 2024 embedded brains GmbH & Co. KG
+ * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1998-2001, 2003  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <rtems/base64.h>
+
+static void
+_Base64_Put(int c, void *arg, IO_Put_char put_char)
+{
+	(*put_char)(c, arg);
+}
+
+static int
+_Base64_Do_encode(IO_Put_char put_char, void *arg, const void *src,
+    size_t srclen, const char *wordbreak, int wordlen, const char *encoding)
+{
+	unsigned int loops = 0;
+	const unsigned char *in = src;
+	int out = 0;
+
+	if (wordlen < 4) {
+		wordlen = 4;
+	}
+
+	while (srclen > 2) {
+		_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
+		_Base64_Put(encoding[((in[0]<<4)&0x30)|
+				((in[1]>>4)&0x0f)], arg, put_char);
+		_Base64_Put(encoding[((in[1]<<2)&0x3c)|
+				((in[2]>>6)&0x03)], arg, put_char);
+		_Base64_Put(encoding[in[2]&0x3f], arg, put_char);
+		in += 3;
+		srclen -= 3;
+		out += 4;
+
+		loops++;
+		if (srclen != 0 &&
+		    (int)((loops + 1) * 4) >= wordlen)
+		{
+			const char *w = wordbreak;
+			loops = 0;
+			while (*w != '\0') {
+				_Base64_Put(*w, arg, put_char);
+				++w;
+				++out;
+			}
+		}
+	}
+	if (srclen == 2) {
+		_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
+		_Base64_Put(encoding[((in[0]<<4)&0x30)|
+				((in[1]>>4)&0x0f)], arg, put_char);
+		_Base64_Put(encoding[((in[1]<<2)&0x3c)], arg, put_char);
+		_Base64_Put('=', arg, put_char);
+		out += 4;
+	} else if (srclen == 1) {
+		_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
+		_Base64_Put(encoding[((in[0]<<4)&0x30)], arg, put_char);
+		_Base64_Put('=', arg, put_char);
+		_Base64_Put('=', arg, put_char);
+		out += 4;
+	}
+	return out;
+}
+
+static const char base64[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+int
+_Base64_Encode(IO_Put_char put_char, void *arg, const void *src, size_t srclen,
+    const char *wordbreak, int wordlen)
+{
+	return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
+	    wordlen, base64);
+}
+
+static const char base64url[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=";
+
+int
+_Base64url_Encode(IO_Put_char put_char, void *arg, const void *src,
+    size_t srclen, const char *wordbreak, int wordlen)
+{
+	return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
+	    wordlen, base64url);
+}