First Kindle 4 PC solution

skindle/b64.c

@@ -0,0 +1,80 @@
+/*********************************************************************\
+LICENCE:        Copyright (c) 2001 Bob Trower, Trantor Standard Systems Inc.
+
+                Permission is hereby granted, free of charge, to any person
+                obtaining a copy of this software and associated
+                documentation files (the "Software"), to deal in the
+                Software without restriction, including without limitation
+                the rights to use, copy, modify, merge, publish, distribute,
+                sublicense, and/or sell copies of the Software, and to
+                permit persons to whom the Software is furnished to do so,
+                subject to the following conditions:
+
+                The above copyright notice and this permission notice shall
+                be included in all copies or substantial portions of the
+                Software.
+
+                THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+                KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+                WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+                PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+                OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+                OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+                OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+                SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+VERSION HISTORY:
+                Bob Trower 08/04/01 -- Create Version 0.00.00B
+
+\******************************************************************* */
+
+#include <stdlib.h>
+
+/*
+** Translation Table as described in RFC1113
+*/
+static const char cb64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+/*
+** encodeblock
+**
+** encode 3 8-bit binary bytes as 4 '6-bit' characters
+*/
+void encodeblock(unsigned char in[3], unsigned char out[4], int len) {
+    out[0] = cb64[ in[0] >> 2 ];
+    out[1] = cb64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
+    out[2] = (unsigned char) (len > 1 ? cb64[ ((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6) ] : '=');
+    out[3] = (unsigned char) (len > 2 ? cb64[ in[2] & 0x3f ] : '=');
+}
+
+/*
+** encode
+**
+** base64 encode a stream adding padding and line breaks as per spec.
+*/
+unsigned int base64(unsigned char *inbuf, unsigned int len, unsigned char *outbuf) {
+   unsigned char in[3], out[4];
+   int c;
+   unsigned int i = 0;
+   unsigned int outlen = 0;
+   while (i < len) {
+      int n = 0;
+      for(c = 0; c < 3; c++, i++) {
+         if (i < len) {
+            in[c] = inbuf[i];
+            n++;
+         }
+         else {
+            in[c] = 0;
+         }
+      }
+      if (n) {
+         encodeblock(in, out, n);
+         for(c = 0; c < 4; c++) {
+            outbuf[outlen++] = out[c];
+         }
+      }
+   }
+   return outlen;
+}
+