imported KAME-DHCPv6 snapshot at 20051201KAME_20051201

1 files changed, 172 insertions, 0 deletions

diff --git a/base64.c b/base64.c
new file mode 100644
index 0000000..7c9731d
--- /dev/null
+++ b/base64.c
@@ -0,0 +1,172 @@
+/*	$KAME: base64.c,v 1.1 2004/06/08 07:26:56 jinmei Exp $	*/
+
+/*
+ * Copyright (C) 2004 WIDE Project.
+ * All rights reserved.
+ *
+ * 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, 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.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
+ */
+
+/*
+ * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1998-2001, 2003  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and 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 <string.h>
+
+typedef enum { FALSE = 0, TRUE = 1 } boolean_t;
+
+static const char base64[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+/*
+ * State of a base64 decoding process in progress.
+ */
+typedef struct {
+	int length;		/* Desired length of binary data or -1 */
+	int digits;		/* Number of buffered base64 digits */
+	boolean_t seen_end;	/* True if "=" end marker seen */
+	int val[4];
+
+	char *dst;		/* Head of the available space for resulting
+				 * binary data */
+	char *dstend;		/* End of the buffer */
+} base64_decode_ctx_t;
+
+static int
+mem_tobuffer(base64_decode_ctx_t *ctx, void *base, unsigned int length)
+{
+	if (ctx->dst + length >= ctx->dstend)
+		return (-1);
+	memcpy(ctx->dst, base, length);
+	ctx->dst += length;
+	return (0);
+}
+
+static inline void
+base64_decode_init(base64_decode_ctx_t *ctx, int length,
+    char *result, size_t resultlen)
+{
+	ctx->digits = 0;
+	ctx->seen_end = FALSE;
+	ctx->length = length;
+	ctx->dst = result;
+	ctx->dstend = result + resultlen;
+}
+
+static inline int
+base64_decode_char(base64_decode_ctx_t *ctx, int c)
+{
+	char *s;
+
+	if (ctx->seen_end == TRUE)
+		return (-1);
+	if ((s = strchr(base64, c)) == NULL)
+		return (-1);
+	ctx->val[ctx->digits++] = s - base64;
+	if (ctx->digits == 4) {
+		int n;
+		unsigned char buf[3];
+		if (ctx->val[0] == 64 || ctx->val[1] == 64)
+			return (-1);
+		if (ctx->val[2] == 64 && ctx->val[3] != 64)
+			return (-1);
+		/*
+		 * Check that bits that should be zero are.
+		 */
+		if (ctx->val[2] == 64 && (ctx->val[1] & 0xf) != 0)
+			return (-1);
+		/*
+		 * We don't need to test for ctx->val[2] != 64 as
+		 * the bottom two bits of 64 are zero.
+		 */
+		if (ctx->val[3] == 64 && (ctx->val[2] & 0x3) != 0)
+			return (-1);
+		n = (ctx->val[2] == 64) ? 1 :
+			(ctx->val[3] == 64) ? 2 : 3;
+		if (n != 3) {
+			ctx->seen_end = TRUE;
+			if (ctx->val[2] == 64)
+				ctx->val[2] = 0;
+			if (ctx->val[3] == 64)
+				ctx->val[3] = 0;
+		}
+		buf[0] = (ctx->val[0]<<2)|(ctx->val[1]>>4);
+		buf[1] = (ctx->val[1]<<4)|(ctx->val[2]>>2);
+		buf[2] = (ctx->val[2]<<6)|(ctx->val[3]);
+		if (mem_tobuffer(ctx, buf, n))
+			return (-1);
+		if (ctx->length >= 0) {
+			if (n > ctx->length)
+				return (-1);
+			else
+				ctx->length -= n;
+		}
+		ctx->digits = 0;
+	}
+	return (0);
+}
+
+static inline int
+base64_decode_finish(base64_decode_ctx_t *ctx)
+{
+	if (ctx->length > 0)
+		return (-1);
+	if (ctx->digits != 0)
+		return (-1);
+	return (0);
+}
+
+int
+base64_decodestring(const char *cstr, char *result, size_t resultlen)
+{
+	base64_decode_ctx_t ctx;
+
+	base64_decode_init(&ctx, -1, result, resultlen);
+	for (;;) {
+		int c = *cstr++;
+		if (c == '\0')
+			break;
+		if (c == ' ' || c == '\t' || c == '\n' || c== '\r')
+			continue;
+		if (base64_decode_char(&ctx, c))
+			return (-1);
+	}
+	if (base64_decode_finish(&ctx))
+		return (-1);
+	return (ctx.dst - result);
+}