Http cache: Use asynchronous IO to read an write the

response headers from the disk cache.

BUG=26729
TEST=current unit tests.


Review URL: http://codereview.chromium.org/506081

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35094 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 21 insertions, 0 deletions

diff --git a/net/base/io_buffer.h b/net/base/io_buffer.h
index 671b263..d908eec 100644
--- a/net/base/io_buffer.h
+++ b/net/base/io_buffer.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/pickle.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 
@@ -131,6 +132,26 @@ class GrowableIOBuffer : public IOBuffer {
   int offset_;
 };
 
+// This versions allows a pickle to be used as the storage for a write-style
+// operation, avoiding an extra data copy.
+class PickledIOBuffer : public IOBuffer {
+ public:
+  PickledIOBuffer() : IOBuffer() {}
+
+  Pickle* pickle() { return &pickle_; }
+
+  // Signals that we are done writing to the picke and we can use it for a
+  // write-style IO operation.
+  void Done() {
+    data_ = const_cast<char*>(static_cast<const char*>(pickle_.data()));
+  }
+
+ private:
+  ~PickledIOBuffer() { data_ = NULL; }
+
+  Pickle pickle_;
+};
+
 // This class allows the creation of a temporary IOBuffer that doesn't really
 // own the underlying buffer. Please use this class only as a last resort.
 // A good example is the buffer for a synchronous operation, where we can be