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Unified Diff: net/spdy/spdy_frame_reader.h

Issue 9618002: SPDY - integration of spdy/3 code. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 8 years, 9 months ago
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Index: net/spdy/spdy_frame_reader.h
===================================================================
--- net/spdy/spdy_frame_reader.h (revision 0)
+++ net/spdy/spdy_frame_reader.h (working copy)
@@ -0,0 +1,96 @@
+// Copyright (c) 2012 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.
+
+#ifndef NET_SPDY_FRAME_READER_H_
+#define NET_SPDY_FRAME_READER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/string_piece.h"
+#include "net/base/net_export.h"
+
+namespace spdy {
+
+// Used for reading SPDY frames. Though there isn't really anything terribly
+// SPDY-specific here, it's a helper class that's useful when doing SPDY
+// framing.
+//
+// To use, simply construct a SpdyFramerReader using the underlying buffer that
+// you'd like to read fields from, then call one of the Read*() methods to
+// actually do some reading.
+//
+// This class keeps an internal iterator to keep track of what's already been
+// read and each successive Read*() call automatically increments said iterator
+// on success. On failure, internal state of the SpdyFrameReader should not be
+// trusted and it is up to the caller to throw away the failed instance and
+// handle the error as appropriate. None of the Read*() methods should ever be
+// called after failure, as they will also fail immediately.
+class NET_EXPORT_PRIVATE SpdyFrameReader {
+ public:
+ // Caller must provide an underlying buffer to work on.
+ SpdyFrameReader(const char* data, const size_t len);
+
+ // Empty destructor.
+ ~SpdyFrameReader() {}
+
+ // Reads a 16-bit unsigned integer into the given output parameter.
+ // Forwards the internal iterater on success.
+ // Returns true on success, false otherwise.
+ bool ReadUInt16(uint16* result);
+
+ // Reads a 32-bit unsigned integer into the given output parameter.
+ // Forwards the internal iterater on success.
+ // Returns true on success, false otherwise.
+ bool ReadUInt32(uint32* result);
+
+ // Reads a string prefixed with 16-bit length into the given output parameter.
+ //
+ // NOTE: Does not copy but rather references strings in the underlying buffer.
+ // This should be kept in mind when handling memory management!
+ //
+ // Forwards the internal iterater on success.
+ // Returns true on success, false otherwise.
+ bool ReadStringPiece16(base::StringPiece* result);
+
+ // Reads a string prefixed with 32-bit length into the given output parameter.
+ //
+ // NOTE: Does not copy but rather references strings in the underlying buffer.
+ // This should be kept in mind when handling memory management!
+ //
+ // Forwards the internal iterater on success.
+ // Returns true on success, false otherwise.
+ bool ReadStringPiece32(base::StringPiece* result);
+
+ // Reads a given number of bytes into the given buffer. The buffer
+ // must be of adequate size.
+ // Forwards the internal iterater on success.
+ // Returns true on success, false otherwise.
+ bool ReadBytes(void* result, size_t size);
+
+ // Returns true if the entirety of the underlying buffer has been read via
+ // Read*() calls.
+ bool IsDoneReading() const;
+
+ private:
+ // Returns true if the underlying buffer has enough room to read the given
+ // amount of bytes.
+ bool CanRead(size_t bytes) const;
+
+ // To be called when a read fails for any reason.
+ void OnFailure();
+
+ // The data buffer that we're reading from.
+ const char* data_;
+
+ // The length of the data buffer that we're reading from.
+ const size_t len_;
+
+ // The location of the next read from our data buffer.
+ size_t ofs_;
+};
+
+} // namespace spdy
+
+#endif // NET_SPDY_FRAME_READER_H_
+
Property changes on: net/spdy/spdy_frame_reader.h
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+LF
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