| // 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. |
| |
| #include "net/spdy/hpack_encoding_context.h" |
| |
| #include <cstddef> |
| |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "net/spdy/hpack_constants.h" |
| #include "net/spdy/hpack_entry.h" |
| |
| namespace net { |
| |
| using base::StringPiece; |
| |
| namespace { |
| |
| // An entry in the static table. Must be a POD in order to avoid |
| // static initializers, i.e. no user-defined constructors or |
| // destructors. |
| struct StaticEntry { |
| const char* const name; |
| const size_t name_len; |
| const char* const value; |
| const size_t value_len; |
| }; |
| |
| // The "constructor" for a StaticEntry that computes the lengths at |
| // compile time. |
| #define STATIC_ENTRY(name, value) \ |
| { name, arraysize(name) - 1, value, arraysize(value) - 1 } |
| |
| const StaticEntry kStaticTable[] = { |
| STATIC_ENTRY(":authority" , ""), // 1 |
| STATIC_ENTRY(":method" , "GET"), // 2 |
| STATIC_ENTRY(":method" , "POST"), // 3 |
| STATIC_ENTRY(":path" , "/"), // 4 |
| STATIC_ENTRY(":path" , "/index.html"), // 5 |
| STATIC_ENTRY(":scheme" , "http"), // 6 |
| STATIC_ENTRY(":scheme" , "https"), // 7 |
| STATIC_ENTRY(":status" , "200"), // 8 |
| STATIC_ENTRY(":status" , "500"), // 9 |
| STATIC_ENTRY(":status" , "404"), // 10 |
| STATIC_ENTRY(":status" , "403"), // 11 |
| STATIC_ENTRY(":status" , "400"), // 12 |
| STATIC_ENTRY(":status" , "401"), // 13 |
| STATIC_ENTRY("accept-charset" , ""), // 14 |
| STATIC_ENTRY("accept-encoding" , ""), // 15 |
| STATIC_ENTRY("accept-language" , ""), // 16 |
| STATIC_ENTRY("accept-ranges" , ""), // 17 |
| STATIC_ENTRY("accept" , ""), // 18 |
| STATIC_ENTRY("access-control-allow-origin" , ""), // 19 |
| STATIC_ENTRY("age" , ""), // 20 |
| STATIC_ENTRY("allow" , ""), // 21 |
| STATIC_ENTRY("authorization" , ""), // 22 |
| STATIC_ENTRY("cache-control" , ""), // 23 |
| STATIC_ENTRY("content-disposition" , ""), // 24 |
| STATIC_ENTRY("content-encoding" , ""), // 25 |
| STATIC_ENTRY("content-language" , ""), // 26 |
| STATIC_ENTRY("content-length" , ""), // 27 |
| STATIC_ENTRY("content-location" , ""), // 28 |
| STATIC_ENTRY("content-range" , ""), // 29 |
| STATIC_ENTRY("content-type" , ""), // 30 |
| STATIC_ENTRY("cookie" , ""), // 31 |
| STATIC_ENTRY("date" , ""), // 32 |
| STATIC_ENTRY("etag" , ""), // 33 |
| STATIC_ENTRY("expect" , ""), // 34 |
| STATIC_ENTRY("expires" , ""), // 35 |
| STATIC_ENTRY("from" , ""), // 36 |
| STATIC_ENTRY("host" , ""), // 37 |
| STATIC_ENTRY("if-match" , ""), // 38 |
| STATIC_ENTRY("if-modified-since" , ""), // 39 |
| STATIC_ENTRY("if-none-match" , ""), // 40 |
| STATIC_ENTRY("if-range" , ""), // 41 |
| STATIC_ENTRY("if-unmodified-since" , ""), // 42 |
| STATIC_ENTRY("last-modified" , ""), // 43 |
| STATIC_ENTRY("link" , ""), // 44 |
| STATIC_ENTRY("location" , ""), // 45 |
| STATIC_ENTRY("max-forwards" , ""), // 46 |
| STATIC_ENTRY("proxy-authenticate" , ""), // 47 |
| STATIC_ENTRY("proxy-authorization" , ""), // 48 |
| STATIC_ENTRY("range" , ""), // 49 |
| STATIC_ENTRY("referer" , ""), // 50 |
| STATIC_ENTRY("refresh" , ""), // 51 |
| STATIC_ENTRY("retry-after" , ""), // 52 |
| STATIC_ENTRY("server" , ""), // 53 |
| STATIC_ENTRY("set-cookie" , ""), // 54 |
| STATIC_ENTRY("strict-transport-security" , ""), // 55 |
| STATIC_ENTRY("transfer-encoding" , ""), // 56 |
| STATIC_ENTRY("user-agent" , ""), // 57 |
| STATIC_ENTRY("vary" , ""), // 58 |
| STATIC_ENTRY("via" , ""), // 59 |
| STATIC_ENTRY("www-authenticate" , ""), // 60 |
| }; |
| |
| #undef STATIC_ENTRY |
| |
| const size_t kStaticEntryCount = arraysize(kStaticTable); |
| |
| } // namespace |
| |
| // Must match HpackEntry::kUntouched. |
| const uint32 HpackEncodingContext::kUntouched = 0x7fffffff; |
| |
| HpackEncodingContext::HpackEncodingContext() |
| : settings_header_table_size_(kDefaultHeaderTableSizeSetting) { |
| DCHECK_EQ(HpackEncodingContext::kUntouched, HpackEntry::kUntouched); |
| } |
| |
| HpackEncodingContext::~HpackEncodingContext() {} |
| |
| uint32 HpackEncodingContext::GetMutableEntryCount() const { |
| return header_table_.GetEntryCount(); |
| } |
| |
| uint32 HpackEncodingContext::GetEntryCount() const { |
| return GetMutableEntryCount() + kStaticEntryCount; |
| } |
| |
| StringPiece HpackEncodingContext::GetNameAt(uint32 index) const { |
| CHECK_GE(index, 1u); |
| CHECK_LE(index, GetEntryCount()); |
| if (index > header_table_.GetEntryCount()) { |
| const StaticEntry& entry = |
| kStaticTable[index - header_table_.GetEntryCount() - 1]; |
| return StringPiece(entry.name, entry.name_len); |
| } |
| return header_table_.GetEntry(index).name(); |
| } |
| |
| StringPiece HpackEncodingContext::GetValueAt(uint32 index) const { |
| CHECK_GE(index, 1u); |
| CHECK_LE(index, GetEntryCount()); |
| if (index > header_table_.GetEntryCount()) { |
| const StaticEntry& entry = |
| kStaticTable[index - header_table_.GetEntryCount() - 1]; |
| return StringPiece(entry.value, entry.value_len); |
| } |
| return header_table_.GetEntry(index).value(); |
| } |
| |
| bool HpackEncodingContext::IsReferencedAt(uint32 index) const { |
| CHECK_GE(index, 1u); |
| CHECK_LE(index, GetEntryCount()); |
| if (index > header_table_.GetEntryCount()) |
| return false; |
| return header_table_.GetEntry(index).IsReferenced(); |
| } |
| |
| uint32 HpackEncodingContext::GetTouchCountAt(uint32 index) const { |
| CHECK_GE(index, 1u); |
| CHECK_LE(index, GetEntryCount()); |
| if (index > header_table_.GetEntryCount()) |
| return 0; |
| return header_table_.GetEntry(index).TouchCount(); |
| } |
| |
| void HpackEncodingContext::SetReferencedAt(uint32 index, bool referenced) { |
| header_table_.GetMutableEntry(index)->SetReferenced(referenced); |
| } |
| |
| void HpackEncodingContext::AddTouchesAt(uint32 index, uint32 touch_count) { |
| header_table_.GetMutableEntry(index)->AddTouches(touch_count); |
| } |
| |
| void HpackEncodingContext::ClearTouchesAt(uint32 index) { |
| header_table_.GetMutableEntry(index)->ClearTouches(); |
| } |
| |
| void HpackEncodingContext::ApplyHeaderTableSizeSetting(uint32 size) { |
| settings_header_table_size_ = size; |
| if (size < header_table_.max_size()) { |
| // Implicit maximum-size context update. |
| CHECK(ProcessContextUpdateNewMaximumSize(size)); |
| } |
| } |
| |
| bool HpackEncodingContext::ProcessContextUpdateNewMaximumSize(uint32 size) { |
| if (size > settings_header_table_size_) { |
| return false; |
| } |
| header_table_.SetMaxSize(size); |
| return true; |
| } |
| |
| bool HpackEncodingContext::ProcessContextUpdateEmptyReferenceSet() { |
| for (size_t i = 1; i <= header_table_.GetEntryCount(); ++i) { |
| HpackEntry* entry = header_table_.GetMutableEntry(i); |
| if (entry->IsReferenced()) { |
| entry->SetReferenced(false); |
| } |
| } |
| return true; |
| } |
| |
| bool HpackEncodingContext::ProcessIndexedHeader(uint32 index, uint32* new_index, |
| std::vector<uint32>* removed_referenced_indices) { |
| CHECK_GT(index, 0u); |
| CHECK_LT(index, GetEntryCount()); |
| |
| if (index <= header_table_.GetEntryCount()) { |
| *new_index = index; |
| removed_referenced_indices->clear(); |
| HpackEntry* entry = header_table_.GetMutableEntry(index); |
| entry->SetReferenced(!entry->IsReferenced()); |
| } else { |
| // TODO(akalin): Make HpackEntry know about owned strings and |
| // non-owned strings so that it can potentially avoid copies here. |
| HpackEntry entry(GetNameAt(index), GetValueAt(index)); |
| |
| header_table_.TryAddEntry(entry, new_index, removed_referenced_indices); |
| if (*new_index >= 1) { |
| header_table_.GetMutableEntry(*new_index)->SetReferenced(true); |
| } |
| } |
| return true; |
| } |
| |
| bool HpackEncodingContext::ProcessLiteralHeaderWithIncrementalIndexing( |
| StringPiece name, |
| StringPiece value, |
| uint32* index, |
| std::vector<uint32>* removed_referenced_indices) { |
| HpackEntry entry(name, value); |
| header_table_.TryAddEntry(entry, index, removed_referenced_indices); |
| if (*index >= 1) { |
| header_table_.GetMutableEntry(*index)->SetReferenced(true); |
| } |
| return true; |
| } |
| |
| } // namespace net |