AU: Update Downloader to support our image formats.

src/platform/update_engine/split_file_writer.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "update_engine/split_file_writer.h"
 #include <algorithm>
 
 using std::min;
 
 namespace chromeos_update_engine {
@@ skipping 31 matching lines @@
 }
 
 ssize_t SplitFileWriter::Write(const void* bytes, size_t count) {
   const size_t original_count = count;
   
   // This first block is trying to read the first sizeof(uint64_t)
   // bytes, which are the number of bytes that should be written
   // to the first FileWriter.
   if (bytes_received_ < static_cast<off_t>(sizeof(uint64_t))) {
     // Write more to the initial buffer
-    size_t bytes_to_copy = min(count,
-                               sizeof(first_length_buf_) - bytes_received_);
+    size_t bytes_to_copy = min(static_cast<off_t>(count),
+                               static_cast<off_t>(sizeof(first_length_buf_)) -
+                               bytes_received_);
     memcpy(&first_length_buf_[bytes_received_], bytes, bytes_to_copy);
     bytes_received_ += bytes_to_copy;
     count -= bytes_to_copy;
     bytes = static_cast<const void*>(
         static_cast<const char*>(bytes) + bytes_to_copy);
 
     // See if we have all we need
     if (bytes_received_ == sizeof(first_length_buf_)) {
       // Parse first number
       uint64_t big_endian_first_length;
@@ skipping 40 matching lines @@
   if (first_result < 0)
     LOG(ERROR) << "Error Close()ing first file.";
   int second_result = second_file_writer_->Close();
   if (second_result < 0)
     LOG(ERROR) << "Error Close()ing second file.";
   // Return error if either had returned error.
   return second_result < 0 ? second_result : first_result;
 }
 
 }  // namespace chromeos_update_engine