1 files changed, 143 insertions, 0 deletions

diff --git a/libetpan/src/data-types/base64.c b/libetpan/src/data-types/base64.c
new file mode 100644
index 0000000..58a2c04
--- a/dev/null
+++ b/libetpan/src/data-types/base64.c
@@ -0,0 +1,143 @@
+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2005 - Juergen Graf
+ * 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 libEtPan! project 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 AUTHORS 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 AUTHORS 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.
+ */
+
+/*
+ * $Id$
+ */
+
+#include "base64.h"
+
+#include <stdlib.h>
+
+#define OUTPUT_SIZE 513
+#define CHAR64(c)  (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
+
+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
+};
+
+static char basis_64[] =
+   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+char * encode_base64(const char * in, int len)
+{
+  char * output, * tmp;
+  unsigned char oval;
+  int out_len;
+
+  out_len = ((len + 2) / 3 * 4) + 1;
+
+  if ((len > 0) && (in == NULL))
+    return NULL;
+
+  output = malloc(out_len);
+  if (!output)
+    return NULL;
+    
+  tmp = output;
+  while (len >= 3) {
+    *tmp++ = basis_64[in[0] >> 2];
+    *tmp++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+    *tmp++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+    *tmp++ = basis_64[in[2] & 0x3f];
+    in += 3;
+    len -= 3;
+  }
+  if (len > 0) {
+    *tmp++ = basis_64[in[0] >> 2];
+    oval = (in[0] << 4) & 0x30;
+    if (len > 1) oval |= in[1] >> 4;
+    *tmp++ = basis_64[oval];
+    *tmp++ = (len < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
+    *tmp++ = '=';
+  }
+
+  *tmp = '\0';
+    
+  return output;
+}
+
+char * decode_base64(const char * in, int len)
+{
+  char * output, * out;
+  int i, c1, c2, c3, c4, out_len;
+
+  out_len = 0;
+  
+  output = malloc(OUTPUT_SIZE);
+  if (output == NULL)
+    return NULL;
+  out = output;
+
+  if (in[0] == '+' && in[1] == ' ')
+    in += 2;
+  
+  for (i = 0; i < (len / 4); i++) {
+    c1 = in[0];
+    c2 = in[1];
+    c3 = in[2];
+    c4 = in[3];
+    if (CHAR64(c1) == -1 || CHAR64(c2) == -1 || 
+        (c3 != '=' && CHAR64(c3) == -1) || 
+        (c4 != '=' && CHAR64(c4) == -1))
+      return NULL;
+
+    in += 4;
+    *output++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
+    if (++out_len >= OUTPUT_SIZE)
+      return NULL;
+
+    if (c3 != '=') {
+      *output++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
+      if (++out_len >= OUTPUT_SIZE)
+        return NULL;
+      
+      if (c4 != '=') {
+        *output++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);  
+        if (++out_len >= OUTPUT_SIZE)
+          return NULL;
+      }
+    }
+  }
+  
+  *output = 0;
+  
+  return out;
+}
+
+