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Unified Diff: net/spdy/hpack_huffman_table.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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Index: net/spdy/hpack_huffman_table.h
diff --git a/net/spdy/hpack_huffman_table.h b/net/spdy/hpack_huffman_table.h
deleted file mode 100644
index 55352d4e639c14b8d7054c3603a3c5ddaf987c15..0000000000000000000000000000000000000000
--- a/net/spdy/hpack_huffman_table.h
+++ /dev/null
@@ -1,127 +0,0 @@
-// 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>
-
-#include "base/basictypes.h"
-#include "base/strings/string_piece.h"
-#include "net/base/net_export.h"
-#include "net/spdy/hpack_constants.h"
-
-namespace net {
-
-namespace test {
-class HpackHuffmanTablePeer;
-} // namespace test
-
-class HpackInputStream;
-class HpackOutputStream;
-
-// HpackHuffmanTable encodes and decodes string literals using a constructed
-// canonical Huffman code. Once initialized, an instance is read only and
-// may be accessed only through its const interface.
-class NET_EXPORT_PRIVATE HpackHuffmanTable {
- public:
- friend class test::HpackHuffmanTablePeer;
-
- typedef HpackHuffmanSymbol Symbol;
-
- // DecodeTables are multilevel indexes on code prefixes. Each table indexes
- // a portion of the prefix mapped to DecodeEntry, which in turn either
- // captures a terminal symbol, or points to the next DecodeTable to consult
- // with successive portions of the prefix.
- struct NET_EXPORT_PRIVATE DecodeEntry {
- DecodeEntry();
- DecodeEntry(uint8 next_table_index, uint8 length, uint16 symbol_id);
-
- // The next table to consult. If this is a terminal,
- // |next_table_index| will be self-referential.
- uint8 next_table_index;
- // Bit-length of terminal code, if this is a terminal. Length of the
- // longest code having this prefix, if non-terminal.
- uint8 length;
- // Set only for terminal entries.
- uint16 symbol_id;
- };
- struct NET_EXPORT_PRIVATE DecodeTable {
- // Number of bits indexed by the chain leading to this table.
- uint8 prefix_length;
- // Number of additional prefix bits this table indexes.
- uint8 indexed_length;
- // Entries are represented as a length |size()| slice into
- // |decode_entries_| beginning at |entries_offset|.
- size_t entries_offset;
- // Returns |1 << indexed_length|.
- size_t size() const;
- };
-
- HpackHuffmanTable();
- ~HpackHuffmanTable();
-
- // Prepares HpackHuffmanTable to encode & decode the canonical Huffman
- // code as determined by the given symbols. Must be called exactly once.
- // Returns false if the input symbols define an invalid coding, and true
- // otherwise. Symbols must be presented in ascending ID order with no gaps,
- // and |symbol_count| must fit in a uint16.
- 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:
- // Expects symbols ordered on length & ID ascending.
- void BuildDecodeTables(const std::vector<Symbol>& symbols);
-
- // Expects symbols ordered on ID ascending.
- void BuildEncodeTable(const std::vector<Symbol>& symbols);
-
- // Adds a new DecodeTable with the argument prefix & indexed length.
- // Returns the new table index.
- uint8 AddDecodeTable(uint8 prefix, uint8 indexed);
-
- const DecodeEntry& Entry(const DecodeTable& table, uint32 index) const;
-
- void SetEntry(const DecodeTable& table, uint32 index,
- const DecodeEntry& entry);
-
- std::vector<DecodeTable> decode_tables_;
- std::vector<DecodeEntry> decode_entries_;
-
- // Symbol code and code length, in ascending symbol ID order.
- // Codes are stored in the most-significant bits of the word.
- std::vector<uint32> code_by_id_;
- std::vector<uint8> length_by_id_;
-
- // The first 8 bits of the longest code. Applied when generating padding bits.
- 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_
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