This CL adds client.toDataURL which gets the contents...

utils/cross/base64.cc

+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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.
+ */
+
+// This file contains the declaration of functions for dealing with base64
+// encoding and decoding
+
+#include "utils/cross/base64.h"
+#include "core/cross/types.h"
+
+namespace o3d {
+namespace base64 {
+
+size_t GetEncodeLength(size_t length) {
+  return (length + 2) / 3 * 4;
+}
+
+void Encode(const void* src_ptr, size_t length, void* dst_ptr) {
+  const int kEncodePad = 64;
+
+  static const char kEncode[] =
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+      "abcdefghijklmnopqrstuvwxyz"
+      "0123456789+/=";
+
+  const uint8* src = reinterpret_cast<const uint8*>(src_ptr);
+  uint8* dst = reinterpret_cast<uint8*>(dst_ptr);
+  if (dst) {
+    size_t remainder = length % 3;
+    const uint8* end = &src[length - remainder];
+    while (src < end) {
+      unsigned a = *src++;
+      unsigned b = *src++;
+      unsigned c = *src++;
+      unsigned d = c & 0x3F;
+      c = (c >> 6 | b << 2) & 0x3F;
+      b = (b >> 4 | a << 4) & 0x3F;
+      a = a >> 2;
+      *dst++ = kEncode[a];
+      *dst++ = kEncode[b];
+      *dst++ = kEncode[c];
+      *dst++ = kEncode[d];
+    }
+    if (remainder > 0) {
+      unsigned k1 = 0;
+      unsigned k2 = kEncodePad;
+      unsigned a =  *src++;
+      if (remainder == 2) {
+        int b = *src++;
+        k1 = b >> 4;
+        k2 = (b << 2) & 0x3F;
+      }
+      *dst++ = kEncode[a >> 2];
+      *dst++ = kEncode[(k1 | a << 4) & 0x3F];
+      *dst++ = kEncode[k2];
+      *dst++ = kEncode[kEncodePad];
+    }
+  }
+}
+
+}  // namespace base64
+}  // namespace o3d
+