From 15318cad33835e4e2dc620d033e43cd930676cdd Mon Sep 17 00:00:00 2001
From: kergoth <kergoth>
Date: Fri, 25 Jan 2002 22:14:26 +0000
Subject: Initial revision

---
(limited to 'rsync/base64.c')

diff --git a/rsync/base64.c b/rsync/base64.c
new file mode 100644
index 0000000..cbe7a8c
--- a/dev/null
+++ b/rsync/base64.c
@@ -0,0 +1,101 @@
+/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
+ *
+ * librsync -- the library for network deltas
+ * $Id$
+ * 
+ * Copyright (C) 2000 by Martin Pool <mbp@samba.org>
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#include <config_rsync.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "rsync.h"
+
+/*
+ * Decode a base64 string in-place - simple and slow algorithm
+ * 
+ * See RFC1521 for the specification of base64.
+ */
+size_t rs_unbase64(char *s)
+{
+    char const *b64 =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    int             bit_offset, byte_offset, idx, i, n;
+    unsigned char  *d = (unsigned char *) s;
+    char           *p;
+
+    n = i = 0;
+
+    while (*s && (p = strchr(b64, *s))) {
+        idx = (int) (p - b64);
+        byte_offset = (i * 6) / 8;
+        bit_offset = (i * 6) % 8;
+        d[byte_offset] &= ~((1 << (8 - bit_offset)) - 1);
+        if (bit_offset < 3) {
+            d[byte_offset] |= (idx << (2 - bit_offset));
+            n = byte_offset + 1;
+        } else {
+            d[byte_offset] |= (idx >> (bit_offset - 2));
+            d[byte_offset + 1] = 0;
+            d[byte_offset + 1] |= (idx << (8 - (bit_offset - 2))) & 0xFF;
+            n = byte_offset + 2;
+        }
+        s++;
+        i++;
+    }
+
+    return n;
+}
+
+/*
+ * Encode a buffer as base64 - simple and slow algorithm.
+ */
+void
+rs_base64(unsigned char const *buf, int n, char *out)
+{
+    char const *b64 =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    int             bytes, i;
+
+    /* work out how many bytes of output there are */
+    bytes = ((n * 8) + 5) / 6;
+
+    for (i = 0; i < bytes; i++) {
+        int             byte = (i * 6) / 8;
+        int             bit = (i * 6) % 8;
+
+        if (bit < 3) {
+            if (byte >= n)
+                abort();
+            *out = b64[(buf[byte] >> (2 - bit)) & 0x3F];
+        } else {
+            if (byte + 1 == n) {
+                *out = b64[(buf[byte] << (bit - 2)) & 0x3F];
+            } else {
+                *out = b64[(buf[byte] << (bit - 2) |
+                            buf[byte + 1] >> (10 - bit)) & 0x3F];
+            }
+        }
+        out++;
+    }
+    *out = 0;
+}
+
--
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