HPACK: Add HpackHuffmanTable::EncodedSize()

net/spdy/hpack_huffman_table.h

 // Copyright 2014 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_HPACK_HUFFMAN_TABLE_H_
 #define NET_SPDY_HPACK_HUFFMAN_TABLE_H_
 
 #include <cstddef>
 #include <string>
 #include <vector>
@@ skipping 59 matching lines @@
   // otherwise. Symbols must be presented in ascending ID order with no gaps.
   bool Initialize(const Symbol* input_symbols, size_t symbol_count);
 
   // Returns whether Initialize() has been successfully called.
   bool IsInitialized() const;
 
   // Encodes the input string to the output stream using the table's Huffman
   // context.
   void EncodeString(base::StringPiece in, HpackOutputStream* out) const;
 
+  // Returns the encoded size of the input string.
+  size_t EncodedSize(base::StringPiece in) const;
+
   // Decodes symbols from |in| into |out|. It is the caller's responsibility
   // to ensure |out| has a reserved a sufficient buffer to hold decoded output.
   // DecodeString() halts when |in| runs out of input, in which case true is
   // returned. It also halts (returning false) if an invalid Huffman code
   // prefix is read, or if |out_capacity| would otherwise be overflowed.
   bool DecodeString(HpackInputStream* in,
                     size_t out_capacity,
                     std::string* out) const;
 
  private:
@@ skipping 24 matching lines @@
   uint8 pad_bits_;
 
   // If initialization fails, preserve the symbol ID which failed validation
   // for examination in tests.
   uint16 failed_symbol_id_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_HPACK_HUFFMAN_TABLE_H_