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95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_HTTP2_HPACK_TOOLS_HPACK_BLOCK_BUILDER_H_
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#define NET_HTTP2_HPACK_TOOLS_HPACK_BLOCK_BUILDER_H_
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// HpackBlockBuilder builds wire-format HPACK blocks (or fragments thereof)
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// from components.
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// Supports very large varints to enable tests to create HPACK blocks with
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// values that the decoder should reject. For now, this is only intended for
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// use in tests, and thus has EXPECT* in the code. If desired to use it in an
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// encoder, it will need optimization work, especially w.r.t memory mgmt, and
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// the EXPECT* will need to be removed or replaced with DCHECKs. And of course
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// the support for very large varints will not be needed in production code.
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#include <stddef.h>
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#include "net/http2/hpack/http2_hpack_constants.h"
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#include "net/http2/platform/api/http2_string.h"
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#include "net/http2/platform/api/http2_string_piece.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace net {
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namespace test {
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class HpackBlockBuilder {
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public:
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explicit HpackBlockBuilder(Http2StringPiece initial_contents)
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: buffer_(initial_contents.data(), initial_contents.size()) {}
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HpackBlockBuilder() {}
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~HpackBlockBuilder() {}
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size_t size() const { return buffer_.size(); }
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const Http2String& buffer() const { return buffer_; }
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//----------------------------------------------------------------------------
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// Methods for appending a valid HPACK entry.
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void AppendIndexedHeader(uint64_t index) {
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AppendEntryTypeAndVarint(HpackEntryType::kIndexedHeader, index);
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}
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void AppendDynamicTableSizeUpdate(uint64_t size) {
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AppendEntryTypeAndVarint(HpackEntryType::kDynamicTableSizeUpdate, size);
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}
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void AppendNameIndexAndLiteralValue(HpackEntryType entry_type,
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uint64_t name_index,
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bool value_is_huffman_encoded,
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Http2StringPiece value) {
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// name_index==0 would indicate that the entry includes a literal name.
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// Call AppendLiteralNameAndValue in that case.
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EXPECT_NE(0u, name_index);
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AppendEntryTypeAndVarint(entry_type, name_index);
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AppendString(value_is_huffman_encoded, value);
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}
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void AppendLiteralNameAndValue(HpackEntryType entry_type,
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bool name_is_huffman_encoded,
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Http2StringPiece name,
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bool value_is_huffman_encoded,
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Http2StringPiece value) {
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AppendEntryTypeAndVarint(entry_type, 0);
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AppendString(name_is_huffman_encoded, name);
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AppendString(value_is_huffman_encoded, value);
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}
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//----------------------------------------------------------------------------
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// Primitive methods that are not guaranteed to write a valid HPACK entry.
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// Appends a varint, with the specified high_bits above the prefix of the
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// varint.
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void AppendHighBitsAndVarint(uint8_t high_bits,
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uint8_t prefix_length,
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uint64_t varint);
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// Append the start of an HPACK entry for the specified type, with the
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// specified varint.
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void AppendEntryTypeAndVarint(HpackEntryType entry_type, uint64_t varint);
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// Append a header string (i.e. a header name or value) in HPACK format.
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// Does NOT perform Huffman encoding.
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void AppendString(bool is_huffman_encoded, Http2StringPiece str);
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private:
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Http2String buffer_;
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};
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} // namespace test
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} // namespace net
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#endif // NET_HTTP2_HPACK_TOOLS_HPACK_BLOCK_BUILDER_H_
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