Revert of Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/hpack/tools/hpack_block_builder.cc

-// Copyright 2016 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.
-
-#include "net/http2/hpack/tools/hpack_block_builder.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace net {
-namespace test {
-
-void HpackBlockBuilder::AppendHighBitsAndVarint(uint8_t high_bits,
-                                                uint8_t prefix_length,
-                                                uint64_t varint) {
-  EXPECT_LE(4, prefix_length);
-  EXPECT_LE(prefix_length, 7);
-
-  // prefix_mask defines the sequence of low-order bits of the first byte
-  // that encode the prefix of the value. It is also the marker in those bits
-  // of the first byte indicating that at least one extension byte is needed.
-  uint8_t prefix_mask = (1 << prefix_length) - 1;
-  EXPECT_EQ(0, high_bits & prefix_mask);
-
-  if (varint < prefix_mask) {
-    uint8_t b = high_bits | static_cast<uint8_t>(varint);
-    buffer_.push_back(static_cast<char>(b));
-    return;
-  }
-
-  // We need extension bytes.
-  buffer_.push_back(static_cast<char>(high_bits | prefix_mask));
-  varint -= prefix_mask;
-  while (varint >= 128) {
-    uint8_t b = static_cast<uint8_t>((varint % 128) + 128);
-    buffer_.push_back(static_cast<char>(b));
-    varint = varint / 128;
-  }
-  char c = static_cast<char>(varint);
-  buffer_.push_back(c);
-}
-
-void HpackBlockBuilder::AppendEntryTypeAndVarint(HpackEntryType entry_type,
-                                                 uint64_t varint) {
-  uint8_t high_bits;
-  uint8_t prefix_length;  // Bits of the varint prefix in the first byte.
-  switch (entry_type) {
-    case HpackEntryType::kIndexedHeader:
-      high_bits = 0x80;
-      prefix_length = 7;
-      break;
-    case HpackEntryType::kDynamicTableSizeUpdate:
-      high_bits = 0x20;
-      prefix_length = 5;
-      break;
-    case HpackEntryType::kIndexedLiteralHeader:
-      high_bits = 0x40;
-      prefix_length = 6;
-      break;
-    case HpackEntryType::kUnindexedLiteralHeader:
-      high_bits = 0x00;
-      prefix_length = 4;
-      break;
-    case HpackEntryType::kNeverIndexedLiteralHeader:
-      high_bits = 0x10;
-      prefix_length = 4;
-      break;
-    default:
-      NOTREACHED();
-      high_bits = 0;
-      prefix_length = 0;
-  }
-  AppendHighBitsAndVarint(high_bits, prefix_length, varint);
-}
-
-void HpackBlockBuilder::AppendString(bool is_huffman_encoded,
-                                     base::StringPiece str) {
-  uint8_t high_bits = is_huffman_encoded ? 0x80 : 0;
-  uint8_t prefix_length = 7;
-  AppendHighBitsAndVarint(high_bits, prefix_length, str.size());
-  str.AppendToString(&buffer_);
-}
-
-}  // namespace test
-}  // namespace net