From 6993bae678904ce29925a5765f1068eb535adac4 Mon Sep 17 00:00:00 2001
From: Colin Phipps <cph@moria.org.uk>
Date: Sun, 15 Apr 2007 12:20:23 +0100
Subject: [PATCH] Duncan Mac-Vicar <dmacvicar@suse.de> pointed out that
 base64.c was missing from the repo.

---
 c/base64.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 c/base64.c

diff --git a/c/base64.c b/c/base64.c
new file mode 100644
index 0000000..f4af592
--- /dev/null
+++ b/c/base64.c
@@ -0,0 +1,89 @@
+/*
+ *
+ * Copyright 1997 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that both the above copyright notice and this
+ * permission notice appear in all copies, that both the above
+ * copyright notice and this permission notice appear in all
+ * supporting documentation, and that the name of M.I.T. not be used
+ * in advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.  M.I.T. makes
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+ * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+ * SHALL M.I.T. 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * Base64 encoding
+ */
+char * base64(const char *src)
+{
+	static const char base64[] =
+	    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	    "abcdefghijklmnopqrstuvwxyz"
+	    "0123456789+/";
+	char *str, *dst;
+	size_t l;
+	int t, r;
+
+	l = strlen(src);
+	if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL)
+		return (NULL);
+	dst = str;
+	r = 0;
+
+	while (l >= 3) {
+		t = (src[0] << 16) | (src[1] << 8) | src[2];
+		dst[0] = base64[(t >> 18) & 0x3f];
+		dst[1] = base64[(t >> 12) & 0x3f];
+		dst[2] = base64[(t >> 6) & 0x3f];
+		dst[3] = base64[(t >> 0) & 0x3f];
+		src += 3; l -= 3;
+		dst += 4; r += 4;
+	}
+
+	switch (l) {
+	case 2:
+		t = (src[0] << 16) | (src[1] << 8);
+		dst[0] = base64[(t >> 18) & 0x3f];
+		dst[1] = base64[(t >> 12) & 0x3f];
+		dst[2] = base64[(t >> 6) & 0x3f];
+		dst[3] = '=';
+		dst += 4;
+		r += 4;
+		break;
+	case 1:
+		t = src[0] << 16;
+		dst[0] = base64[(t >> 18) & 0x3f];
+		dst[1] = base64[(t >> 12) & 0x3f];
+		dst[2] = dst[3] = '=';
+		dst += 4;
+		r += 4;
+		break;
+	case 0:
+		break;
+	}
+
+	*dst = 0;
+	return (str);
+}
+
+