Added member data to classes to support download resumption.

content/browser/download/base_file.cc

 // Copyright (c) 2011 The Chromium 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 "content/browser/download/base_file.h"
 
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
@@ skipping 357 matching lines @@
 
 void BaseFile::Finish() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   if (calculate_hash_)
     secure_hash_->Finish(sha256_hash_, kSha256HashLen);
 
   Close();
 }
 
+bool BaseFile::GetPartialSha256Hash(std::string* hash) {
+  DCHECK(!detached_);
+  if (calculate_hash_)
+    hash->assign(reinterpret_cast<const char*>(sha256_hash_), kSha256HashLen);
+  return calculate_hash_;
+}
+
+bool BaseFile::SetPartialSha256Hash(const std::string& hash) {
+  DCHECK(!detached_);
+  DCHECK(hash.size() == kSha256HashLen);
+  if (calculate_hash_) {
+    memset(sha256_hash_, 0, kSha256HashLen);
+    memcpy(sha256_hash_, hash.c_str(), kSha256HashLen);
+  }
+  return calculate_hash_;
+}
+
 bool BaseFile::GetSha256Hash(std::string* hash) {
-  DCHECK(!detached_);
-  if (!calculate_hash_ || in_progress())
+  if (in_progress())
     return false;
-  hash->assign(reinterpret_cast<const char*>(sha256_hash_),
-               sizeof(sha256_hash_));
-  return true;
+  return GetPartialSha256Hash(hash);
 }
 
 void BaseFile::AnnotateWithSourceInformation() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK(!detached_);
 
 #if defined(OS_WIN)
   // Sets the Zone to tell Windows that this file comes from the internet.
   // We ignore the return value because a failure is not fatal.
   win_util::SetInternetZoneIdentifier(full_path_,
@@ skipping 58 matching lines @@
 std::string BaseFile::DebugString() const {
   return base::StringPrintf("{ source_url_ = \"%s\""
                             " full_path_ = \"%" PRFilePath "\""
                             " bytes_so_far_ = %" PRId64
                             " detached_ = %c }",
                             source_url_.spec().c_str(),
                             full_path_.value().c_str(),
                             bytes_so_far_,
                             detached_ ? 'T' : 'F');
 }