1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/* -*- 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;
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;
nvFIFO mHeaderTable;
uint32_t mMaxBuffer;
uint32_t mMaxBufferSetting;
bool mSetInitialMaxBufferSizeAllowed;
uint32_t mPeakSize;
uint32_t mPeakCount;
MOZ_INIT_OUTSIDE_CTOR
Telemetry::HistogramID mPeakSizeID;
MOZ_INIT_OUTSIDE_CTOR
Telemetry::HistogramID mPeakCountID;
bool mDumpTables;
private:
RefPtr<HpackDynamicTableReporter> mDynamicReporter;
};
class Http2Compressor;
class Http2Decompressor final : public Http2BaseCompressor {
public:
Http2Decompressor()
: mOffset(0),
mData(nullptr),
mDataLen(0),
mSeenNonColonHeader(false),
mIsPush(false) {
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& result);
[[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 index, nsACString& val);
uint8_t ExtractByte(uint8_t bitsLeft, uint32_t& bytesConsumed);
[[nodiscard]] nsresult CopyHuffmanStringFromInput(uint32_t index,
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;
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() = 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;
bool mBufferSizeChangeWaiting;
uint32_t mLowestBufferSizeWaiting;
};
} // namespace net
} // namespace mozilla
#endif // mozilla_net_Http2Compression_Internal_h
|
