Download resumption - Preliminary

content/browser/download/base_file.cc

Index: content/browser/download/base_file.cc
diff --git a/content/browser/download/base_file.cc b/content/browser/download/base_file.cc
index 9d55828f5ecbe0e73b9138239899601c7a0fed07..c5c15325715114f89603a545159763ee88d20fdd 100644
--- a/content/browser/download/base_file.cc
+++ b/content/browser/download/base_file.cc
@@ -296,6 +296,19 @@ DownloadInterruptReason BaseFile::Open() {
     file_stream_->SetBoundNetLogSource(bound_net_log_);
   }
 
+  int64 file_size = file_stream_->SeekSync(net::FROM_END, 0);
+  if (file_size > bytes_so_far_) {
+    // The file is larger than we expected.
+    // This is OK, as long as we don't use the extra.
+    // Truncate the file.
+    int64 truncate_result = file_stream_->Truncate(bytes_so_far_);
+    DCHECK_EQ(bytes_so_far_, truncate_result);
+  } else if (file_size < bytes_so_far_) {
+    // The file is shorter than we expected.  Our hashes won't be valid.
+    // This will map to a generic 'FAIL' interrupt reason.
+    return LogNetError("Seek", net::ERR_UNEXPECTED);
+  }
+
   return DOWNLOAD_INTERRUPT_REASON_NONE;
 }