Diff: lwip/Core/arch/iputil.c

Revision:

0:4570f87afab6

diff -r 000000000000 -r 4570f87afab6 lwip/Core/arch/iputil.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwip/Core/arch/iputil.c	Sat Sep 03 09:42:32 2011 +0000
@@ -0,0 +1,25 @@
+#include "iputil.h"
+
+unsigned int base64enc_len(const char *str) {
+  return (((strlen(str)-1)/3)+1)<<2;
+}
+
+void base64enc(const char *input, unsigned int length, char *output) {
+  static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  unsigned int c, c1, c2, c3;
+  for(unsigned int i = 0, j = 0; i<length; i+=3,j+=4) {
+    c1 = ((((unsigned char)*((unsigned char *)&input[i]))));
+    c2 = (length>i+1)?((((unsigned char)*((unsigned char *)&input[i+1])))):0;
+    c3 = (length>i+2)?((((unsigned char)*((unsigned char *)&input[i+2])))):0;
+
+    c = ((c1 & 0xFC) >> 2);
+    output[j+0] = base64[c];
+    c = ((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4);
+    output[j+1] = base64[c];
+    c = ((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6);
+    output[j+2] = (length>i+1)?base64[c]:'=';
+    c = (c3 & 0x3F);
+    output[j+3] = (length>i+2)?base64[c]:'=';
+  }
+  output[(((length-1)/3)+1)<<2] = '\0';
+}