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Diffstat (limited to 'netwerk/protocol/http/Http2Compression.h')
| -rw-r--r-- | netwerk/protocol/http/Http2Compression.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/netwerk/protocol/http/Http2Compression.h b/netwerk/protocol/http/Http2Compression.h new file mode 100644 index 0000000000..dd98584607 --- /dev/null +++ b/netwerk/protocol/http/Http2Compression.h @@ -0,0 +1,198 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_net_Http2Compression_Internal_h +#define mozilla_net_Http2Compression_Internal_h + +// HPACK - RFC 7541 +// https://www.rfc-editor.org/rfc/rfc7541.txt + +#include "mozilla/Attributes.h" +#include "nsDeque.h" +#include "nsString.h" +#include "mozilla/Telemetry.h" + +namespace mozilla { +namespace net { + +struct HuffmanIncomingTable; + +void Http2CompressionCleanup(); + +class nvPair { + public: + nvPair(const nsACString& name, const nsACString& value) + : mName(name), mValue(value) {} + + uint32_t Size() const { return mName.Length() + mValue.Length() + 32; } + size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const; + size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const; + + nsCString mName; + nsCString mValue; +}; + +class nvFIFO { + public: + nvFIFO(); + ~nvFIFO(); + void AddElement(const nsCString& name, const nsCString& value); + void AddElement(const nsCString& name); + void RemoveElement(); + uint32_t ByteCount() const; + uint32_t Length() const; + uint32_t VariableLength() const; + size_t StaticLength() const; + void Clear(); + const nvPair* operator[](size_t index) const; + + private: + uint32_t mByteCount{0}; + nsDeque<nvPair> mTable; +}; + +class HpackDynamicTableReporter; + +class Http2BaseCompressor { + public: + Http2BaseCompressor(); + virtual ~Http2BaseCompressor(); + size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + nsresult SetInitialMaxBufferSize(uint32_t maxBufferSize); + void SetDumpTables(bool dumpTables); + + protected: + const static uint32_t kDefaultMaxBuffer = 4096; + + virtual void ClearHeaderTable(); + virtual void MakeRoom(uint32_t amount, const char* direction); + virtual void DumpState(const char*); + virtual void SetMaxBufferSizeInternal(uint32_t maxBufferSize); + + nsACString* mOutput{nullptr}; + nvFIFO mHeaderTable; + + uint32_t mMaxBuffer{kDefaultMaxBuffer}; + uint32_t mMaxBufferSetting{kDefaultMaxBuffer}; + bool mSetInitialMaxBufferSizeAllowed{true}; + + uint32_t mPeakSize{0}; + uint32_t mPeakCount{0}; + MOZ_INIT_OUTSIDE_CTOR + Telemetry::HistogramID mPeakSizeID; + MOZ_INIT_OUTSIDE_CTOR + Telemetry::HistogramID mPeakCountID; + + bool mDumpTables{false}; + + private: + RefPtr<HpackDynamicTableReporter> mDynamicReporter; +}; + +class Http2Compressor; + +class Http2Decompressor final : public Http2BaseCompressor { + public: + Http2Decompressor() { + mPeakSizeID = Telemetry::HPACK_PEAK_SIZE_DECOMPRESSOR; + mPeakCountID = Telemetry::HPACK_PEAK_COUNT_DECOMPRESSOR; + }; + virtual ~Http2Decompressor() = default; + + // NS_OK: Produces the working set of HTTP/1 formatted headers + [[nodiscard]] nsresult DecodeHeaderBlock(const uint8_t* data, + uint32_t datalen, nsACString& output, + bool isPush); + + void GetStatus(nsACString& hdr) { hdr = mHeaderStatus; } + void GetHost(nsACString& hdr) { hdr = mHeaderHost; } + void GetScheme(nsACString& hdr) { hdr = mHeaderScheme; } + void GetPath(nsACString& hdr) { hdr = mHeaderPath; } + void GetMethod(nsACString& hdr) { hdr = mHeaderMethod; } + + private: + [[nodiscard]] nsresult DoIndexed(); + [[nodiscard]] nsresult DoLiteralWithoutIndex(); + [[nodiscard]] nsresult DoLiteralWithIncremental(); + [[nodiscard]] nsresult DoLiteralInternal(nsACString&, nsACString&, uint32_t); + [[nodiscard]] nsresult DoLiteralNeverIndexed(); + [[nodiscard]] nsresult DoContextUpdate(); + + [[nodiscard]] nsresult DecodeInteger(uint32_t prefixLen, uint32_t& accum); + [[nodiscard]] nsresult OutputHeader(uint32_t index); + [[nodiscard]] nsresult OutputHeader(const nsACString& name, + const nsACString& value); + + [[nodiscard]] nsresult CopyHeaderString(uint32_t index, nsACString& name); + [[nodiscard]] nsresult CopyStringFromInput(uint32_t bytes, nsACString& val); + uint8_t ExtractByte(uint8_t bitsLeft, uint32_t& bytesConsumed); + [[nodiscard]] nsresult CopyHuffmanStringFromInput(uint32_t bytes, + nsACString& val); + [[nodiscard]] nsresult DecodeHuffmanCharacter( + const HuffmanIncomingTable* table, uint8_t& c, uint32_t& bytesConsumed, + uint8_t& bitsLeft); + [[nodiscard]] nsresult DecodeFinalHuffmanCharacter( + const HuffmanIncomingTable* table, uint8_t& c, uint8_t& bitsLeft); + + nsCString mHeaderStatus; + nsCString mHeaderHost; + nsCString mHeaderScheme; + nsCString mHeaderPath; + nsCString mHeaderMethod; + + // state variables when DecodeBlock() is on the stack + uint32_t mOffset{0}; + const uint8_t* mData{nullptr}; + uint32_t mDataLen{0}; + bool mSeenNonColonHeader{false}; + bool mIsPush{false}; +}; + +class Http2Compressor final : public Http2BaseCompressor { + public: + Http2Compressor() { + mPeakSizeID = Telemetry::HPACK_PEAK_SIZE_COMPRESSOR; + mPeakCountID = Telemetry::HPACK_PEAK_COUNT_COMPRESSOR; + }; + virtual ~Http2Compressor() = default; + + // HTTP/1 formatted header block as input - HTTP/2 formatted + // header block as output + [[nodiscard]] nsresult EncodeHeaderBlock( + const nsCString& nvInput, const nsACString& method, + const nsACString& path, const nsACString& host, const nsACString& scheme, + const nsACString& protocol, bool simpleConnectForm, nsACString& output); + + int64_t GetParsedContentLength() { + return mParsedContentLength; + } // -1 on not found + + void SetMaxBufferSize(uint32_t maxBufferSize); + + private: + enum outputCode { + kNeverIndexedLiteral, + kPlainLiteral, + kIndexedLiteral, + kIndex + }; + + void DoOutput(Http2Compressor::outputCode code, const class nvPair* pair, + uint32_t index); + void EncodeInteger(uint32_t prefixLen, uint32_t val); + void ProcessHeader(const nvPair inputPair, bool noLocalIndex, + bool neverIndex); + void HuffmanAppend(const nsCString& value); + void EncodeTableSizeChange(uint32_t newMaxSize); + + int64_t mParsedContentLength{-1}; + bool mBufferSizeChangeWaiting{false}; + uint32_t mLowestBufferSizeWaiting{0}; +}; + +} // namespace net +} // namespace mozilla + +#endif // mozilla_net_Http2Compression_Internal_h |