Replace string::find(prefix) == 0 pattern with base::StartsWith().

media/blink/resource_multibuffer_data_provider.cc

 // Copyright 2015 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 "media/blink/resource_multibuffer_data_provider.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bits.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/blink/active_loader.h"
 #include "media/blink/cache_util.h"
 #include "media/blink/media_blink_export.h"
 #include "media/blink/url_index.h"
 #include "net/http/http_byte_range.h"
 #include "net/http/http_request_headers.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 
@@ skipping 427 matching lines @@
     // Note that calling Fail() will most likely delete this object.
     url_data_->Fail();
   }
 }
 
 bool ResourceMultiBufferDataProvider::ParseContentRange(
     const std::string& content_range_str,
     int64_t* first_byte_position,
     int64_t* last_byte_position,
     int64_t* instance_size) {
-  const std::string kUpThroughBytesUnit = "bytes ";
-  if (content_range_str.find(kUpThroughBytesUnit) != 0)
+  const char kUpThroughBytesUnit[] = "bytes ";

[Lei Zhang, 2016/07/07 22:33:49]

Thanks

[lazyboy, 2016/07/07 23:44:50]

Acknowledged.

+  if (!base::StartsWith(content_range_str, kUpThroughBytesUnit,
+                        base::CompareCase::SENSITIVE)) {
     return false;
+  }
   std::string range_spec =
-      content_range_str.substr(kUpThroughBytesUnit.length());
+      content_range_str.substr(sizeof(kUpThroughBytesUnit) - 1);
   size_t dash_offset = range_spec.find("-");
   size_t slash_offset = range_spec.find("/");
 
   if (dash_offset == std::string::npos || slash_offset == std::string::npos ||
       slash_offset < dash_offset || slash_offset + 1 == range_spec.length()) {
     return false;
   }
   if (!base::StringToInt64(range_spec.substr(0, dash_offset),
                            first_byte_position) ||
       !base::StringToInt64(
@@ skipping 49 matching lines @@
   }
 
   if (byte_pos() != first_byte_position) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace media