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-rw-r--r--src/base64.cpp104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/base64.cpp b/src/base64.cpp
new file mode 100644
index 00000000..57f2c9bb
--- /dev/null
+++ b/src/base64.cpp
@@ -0,0 +1,104 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * any later version.
+ *
+ * This file 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ */
+
+#include "base64.h"
+#include <ctype.h>
+
+static const char base64digits[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+#define BAD -1
+
+static const char base64val[] = {
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD,
+ BAD, 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,BAD, BAD,BAD,BAD,BAD,
+ BAD, 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,BAD, BAD,BAD,BAD,BAD
+};
+
+#define DECODE64(c) (isascii(c) ? base64val[c] : BAD)
+
+void to64frombits(unsigned char *out, const unsigned char *in, int inlen)
+{
+ for (; inlen >= 3; inlen -= 3)
+ {
+ *out++ = base64digits[in[0] >> 2];
+ *out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+ *out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+ *out++ = base64digits[in[2] & 0x3f];
+ in += 3;
+ }
+ if (inlen > 0)
+ {
+ unsigned char fragment;
+
+ *out++ = base64digits[in[0] >> 2];
+ fragment = (in[0] << 4) & 0x30;
+ if (inlen > 1)
+ fragment |= in[1] >> 4;
+ *out++ = base64digits[fragment];
+ *out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
+ *out++ = '=';
+ }
+ *out = '\0';
+}
+
+int from64tobits(char *out, const char *in)
+{
+ int len = 0;
+ register unsigned char digit1, digit2, digit3, digit4;
+
+ if (in[0] == '+' && in[1] == ' ')
+ in += 2;
+ if (*in == '\r')
+ return(0);
+
+ do {
+ digit1 = in[0];
+ if (DECODE64(digit1) == BAD)
+ return(-1);
+ digit2 = in[1];
+ if (DECODE64(digit2) == BAD)
+ return(-1);
+ digit3 = in[2];
+ if (digit3 != '=' && DECODE64(digit3) == BAD)
+ return(-1);
+ digit4 = in[3];
+ if (digit4 != '=' && DECODE64(digit4) == BAD)
+ return(-1);
+ in += 4;
+ *out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4);
+ ++len;
+ if (digit3 != '=')
+ {
+ *out++ = ((DECODE64(digit2) << 4) & 0xf0) | (DECODE64(digit3) >> 2);
+ ++len;
+ if (digit4 != '=')
+ {
+ *out++ = ((DECODE64(digit3) << 6) & 0xc0) | DECODE64(digit4);
+ ++len;
+ }
+ }
+ } while (*in && *in != '\r' && digit4 != '=');
+
+ return (len);
+}