add hex encoder/decoder

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14614 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/hex.c

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2004-2005 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "hex.h"
+
+const static char hexchar[] = "0123456789ABCDEF";
+
+static int 
+pos(char c)
+{
+    const char *p;
+    c = toupper((unsigned char)c);
+    for (p = hexchar; *p; p++)
+	if (*p == c)
+	    return p - hexchar;
+    return -1;
+}
+
+ssize_t
+hex_encode(const void *data, int size, char **str)
+{
+    const unsigned char *q = data;
+    size_t i;
+    char *p;
+
+    if (size + 1 > SIZE_T_MAX/2)
+	return -1;
+
+    p = malloc(size * 2 + 1);
+    if (p == NULL)
+	return -1;
+    
+    for (i = 0; i < size; i++) {
+	p[i * 2] = hexchar[(*q >> 4) & 0xf];
+	p[i * 2 + 1] = hexchar[*q & 0xf];
+	q++;
+    }
+    p[i * 2] = '\0';
+    *str = p;
+
+    return i * 2;
+}
+
+ssize_t
+hex_decode(const char *str, void *data, size_t len)
+{
+    size_t l;
+    unsigned char *p = data;
+    size_t i;
+	
+    l = strlen(str);
+    if ((l + 1) / 2 > len)
+	return -1;
+
+    for (i = 0; i < len; i++)
+	p[i] = pos(str[i * 2]) << 4 | pos(str[(i * 2) + 1]);
+    return i;
+}

lib/roken/hex.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2005 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+/* $Id$ */
+
+#ifndef _BASE64_H_
+#define _BASE64_H_
+
+#define hex_encode rk_hex_encode
+#define hex_decode rk_hex_decode
+
+ssize_t		hex_encode(const void *, int, char **);
+ssize_t		hex_decode(const char *, void *, size_t);
+
+#endif /* _BASE64_H_ */
+