From 5b38ff25ee9bd1c11f7bc409b5ff249e37599e95 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Tue, 27 May 1997 19:24:49 +0000
Subject: Initial revision

svn path=/trunk/; revision=1030
---
 base64.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 base64.c

diff --git a/base64.c b/base64.c
new file mode 100644
index 00000000..918af9d5
--- /dev/null
+++ b/base64.c
@@ -0,0 +1,92 @@
+/* from imtest.c -- IMAP/IMSP test client
+ * Cyrus IMAPd 1.5.2 <URL:ftp://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-imapd-v1.5.2.tar.gz>
+ *
+ * Copyright 1996, Carnegie Mellon University.  All Rights Reserved.
+ * 
+ * This software is made available for academic and research
+ * purposes only.  No commercial license is hereby granted.
+ * Copying and other reproduction is authorized only for research,
+ * education, and other non-commercial purposes.  No warranties,
+ * either expressed or implied, are made regarding the operation,
+ * use, or results of the software.  Such a release does not permit
+ * use of the code for commercial purposes or benefits by anyone
+ * without specific, additional permission by the owner of the code.
+ *
+ * Author: Chris Newman <chrisn+@cmu.edu>
+ * Start Date: 2/16/93
+ */
+
+/* base64 tables
+ */
+static char basis_64[] =
+   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static char index_64[128] = {
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+    52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+    -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+    15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
+    -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+    41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+};
+#define CHAR64(c)  (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
+
+void to64(out, in, inlen)
+    unsigned char *out, *in;
+    int inlen;
+{
+    unsigned char oval;
+    
+    while (inlen >= 3) {
+	*out++ = basis_64[in[0] >> 2];
+	*out++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+	*out++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+	*out++ = basis_64[in[2] & 0x3f];
+	in += 3;
+	inlen -= 3;
+    }
+    if (inlen > 0) {
+	*out++ = basis_64[in[0] >> 2];
+	oval = (in[0] << 4) & 0x30;
+	if (inlen > 1) oval |= in[1] >> 4;
+	*out++ = basis_64[oval];
+	*out++ = (inlen < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
+	*out++ = '=';
+    }
+    *out = '\0';
+}
+
+int from64(out, in)
+    char *out, *in;
+{
+    int len = 0;
+    int c1, c2, c3, c4;
+
+    if (in[0] == '+' && in[1] == ' ') in += 2;
+    if (*in == '\r') return (0);
+    do {
+	c1 = in[0];
+	if (CHAR64(c1) == -1) return (-1);
+	c2 = in[1];
+	if (CHAR64(c2) == -1) return (-1);
+	c3 = in[2];
+	if (c3 != '=' && CHAR64(c3) == -1) return (-1); 
+	c4 = in[3];
+	if (c4 != '=' && CHAR64(c4) == -1) return (-1);
+	in += 4;
+	*out++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
+	++len;
+	if (c3 != '=') {
+	    *out++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
+	    ++len;
+	    if (c4 != '=') {
+		*out++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);
+		++len;
+	    }
+	}
+    } while (*in != '\r' && c4 != '=');
+
+    return (len);
+}
+
-- 
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