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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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202
netwerk/protocol/http/Http2Compression.h Normal file
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/* -*- 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 "nsIMemoryReporter.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;
nsDeque mTable;
};
class HpackDynamicTableReporter;
class Http2BaseCompressor
{
public:
Http2BaseCompressor();
virtual ~Http2BaseCompressor();
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
nsresult SetInitialMaxBufferSize(uint32_t maxBufferSize);
protected:
const static uint32_t kDefaultMaxBuffer = 4096;
virtual void ClearHeaderTable();
virtual void MakeRoom(uint32_t amount, const char *direction);
virtual void DumpState();
virtual void SetMaxBufferSizeInternal(uint32_t maxBufferSize);
nsACString *mOutput;
nvFIFO mHeaderTable;
uint32_t mMaxBuffer;
uint32_t mMaxBufferSetting;
bool mSetInitialMaxBufferSizeAllowed;
uint32_t mPeakSize;
uint32_t mPeakCount;
MOZ_INIT_OUTSIDE_CTOR
Telemetry::ID mPeakSizeID;
MOZ_INIT_OUTSIDE_CTOR
Telemetry::ID mPeakCountID;
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() { } ;
// NS_OK: Produces the working set of HTTP/1 formatted headers
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:
nsresult DoIndexed();
nsresult DoLiteralWithoutIndex();
nsresult DoLiteralWithIncremental();
nsresult DoLiteralInternal(nsACString &, nsACString &, uint32_t);
nsresult DoLiteralNeverIndexed();
nsresult DoContextUpdate();
nsresult DecodeInteger(uint32_t prefixLen, uint32_t &result);
nsresult OutputHeader(uint32_t index);
nsresult OutputHeader(const nsACString &name, const nsACString &value);
nsresult CopyHeaderString(uint32_t index, nsACString &name);
nsresult CopyStringFromInput(uint32_t index, nsACString &val);
uint8_t ExtractByte(uint8_t bitsLeft, uint32_t &bytesConsumed);
nsresult CopyHuffmanStringFromInput(uint32_t index, nsACString &val);
nsresult DecodeHuffmanCharacter(const HuffmanIncomingTable *table, uint8_t &c,
uint32_t &bytesConsumed, uint8_t &bitsLeft);
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;
const uint8_t *mData;
uint32_t mDataLen;
bool mSeenNonColonHeader;
bool mIsPush;
};
class Http2Compressor final : public Http2BaseCompressor
{
public:
Http2Compressor() : mParsedContentLength(-1),
mBufferSizeChangeWaiting(false),
mLowestBufferSizeWaiting(0)
{
mPeakSizeID = Telemetry::HPACK_PEAK_SIZE_COMPRESSOR;
mPeakCountID = Telemetry::HPACK_PEAK_COUNT_COMPRESSOR;
};
virtual ~Http2Compressor() { }
// HTTP/1 formatted header block as input - HTTP/2 formatted
// header block as output
nsresult EncodeHeaderBlock(const nsCString &nvInput,
const nsACString &method, const nsACString &path,
const nsACString &host, const nsACString &scheme,
bool connectForm, 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;
bool mBufferSizeChangeWaiting;
uint32_t mLowestBufferSizeWaiting;
};
} // namespace net
} // namespace mozilla
#endif // mozilla_net_Http2Compression_Internal_h