Implemented cBase64Encoder

CONTRIBUTORS

@@ -1565,3 +1565,8 @@ Christof Steininger <christof.steininger@t-online.de>
 
 Kendy Kutzner <kutzner@ira.uka.de>
  for making the version number of EPG events be stored in the epg.data file
+
+Bob Withers <bwit@pobox.com>
+ for publishing a Base64 encoder at http://www.ruffboy.com/download.htm
+ (http://www.ruffboy.com/code/Base64.zip), part of which was used when writing
+ the cBase64Encoder class

HISTORY

@@ -4017,3 +4017,5 @@ Video Disk Recorder Revision History
   function cDevice::GrabImageFile() can be used to write the grabbed image
   directly to a file. Plugins that used the old version of cDevice::GrabImage()
   need to be adapted to the new interface.
+- The new class cBase64Encoder (see tools.h) can be used to encode data in
+  base64 (thanks to Bob Withers for publishing his Base64 class).

tools.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.c 1.106 2005/12/29 11:20:28 kls Exp $
+ * $Id: tools.c 1.107 2005/12/29 16:02:37 kls Exp $
  */
 
 #include "tools.h"
@@ -745,6 +745,58 @@ uchar *RgbToJpeg(uchar *Mem, int Width, int Height, int &Size, int Quality)
   return jcd.mem;
 }
 
+// --- cBase64Encoder --------------------------------------------------------
+
+const char *cBase64Encoder::b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+cBase64Encoder::cBase64Encoder(const uchar *Data, int Length, int MaxResult)
+{
+  data = Data;
+  length = Length;
+  maxResult = MaxResult;
+  i = 0;
+  result = MALLOC(char, maxResult + 1);
+}
+
+cBase64Encoder::~cBase64Encoder()
+{
+  free(result);
+}
+
+const char *cBase64Encoder::NextLine(void)
+{
+  int r = 0;
+  while (i < length && r < maxResult - 3) {
+        result[r++] = b64[(data[i] >> 2) & 0x3F];
+        char c = (data[i] << 4) & 0x3F;
+        if (++i < length)
+           c |= (data[i] >> 4) & 0x0F;
+        result[r++] = b64[c];
+        if (i < length) {
+           c = (data[i] << 2) & 0x3F;
+           if (++i < length)
+              c |= (data[i] >> 6) & 0x03;
+           result[r++] = b64[c];
+           }
+        else {
+           i++;
+           result[r++] = '=';
+           }
+        if (i < length) {
+           c = data[i] & 0x3F;
+           result[r++] = b64[c];
+           }
+        else
+           result[r++] = '=';
+        i++;
+        }
+  if (r > 0) {
+     result[r] = 0;
+     return result;
+     }
+  return NULL;
+}
+
 // --- cReadLine -------------------------------------------------------------
 
 cReadLine::cReadLine(void)

tools.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.h 1.86 2005/12/29 11:09:43 kls Exp $
+ * $Id: tools.h 1.87 2005/12/29 15:48:46 kls Exp $
  */
 
 #ifndef __TOOLS_H
@@ -131,6 +131,29 @@ uchar *RgbToJpeg(uchar *Mem, int Width, int Height, int &Size, int Quality = 100
     ///< the result and has to delete it once it is no longer needed.
     ///< The result may be NULL in case of an error.
 
+class cBase64Encoder {
+private:
+  const uchar *data;
+  int length;
+  int maxResult;
+  int i;
+  char *result;
+  static const char *b64;
+public:
+  cBase64Encoder(const uchar *Data, int Length, int MaxResult = 64);
+      ///< Sets up a new base 64 encoder for the given Data, with the given Length.
+      ///< Data will not be copied and must be valid for the entire lifetime of the
+      ///< encoder. MaxResult defines the maximum number of characters in any
+      ///< result line. The resulting lines may be shorter than MaxResult in case
+      ///< its value is not a multiple of 4.
+  ~cBase64Encoder();
+  const char *NextLine(void);
+      ///< Returns the next line of encoded data (terminated by '\0'), or NULL if
+      ///< there is no more encoded data. The caller must call NextLine() and process
+      ///< each returned line until NULL is returned, in order to get the entire
+      ///< data encoded.
+  };
+
 class cTimeMs {
 private:
   uint64 begin;