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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (C) 2011-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*
* This code implements parsing of HTTP requests.
* This code was written by Steve Hanov in 2009, no copyright is claimed.
* This code is in the public domain.
* Code was taken from http://refactormycode.com/codes/778-an-efficient-http-parser
*/
#include "HttpParser.h"
HttpParser::~HttpParser() = default;
void
HttpParser::parseHeader()
{
// run the fsm.
const int CR = 13;
const int LF = 10;
const int ANY = 256;
enum Action {
// make lower case
LOWER = 0x1,
// convert current character to null.
NULLIFY = 0x2,
// set the header index to the current position
SET_HEADER_START = 0x4,
// set the key index to the current position
SET_KEY = 0x8,
// set value index to the current position.
SET_VALUE = 0x10,
// store current key/value pair.
STORE_KEY_VALUE = 0x20,
// sets content start to current position + 1
SET_CONTENT_START = 0x40
};
static const struct FSM {
State curState;
int c;
State nextState;
unsigned actions;
} fsm[] = {
{ p_request_line, CR, p_request_line_cr, NULLIFY },
{ p_request_line, ANY, p_request_line, 0 },
{ p_request_line_cr, LF, p_request_line_crlf, 0 },
{ p_request_line_crlf, CR, p_request_line_crlfcr, 0 },
{ p_request_line_crlf, ANY, p_key, SET_HEADER_START | SET_KEY | LOWER },
{ p_request_line_crlfcr, LF, p_content, SET_CONTENT_START },
{ p_key, ':', p_key_colon, NULLIFY },
{ p_key, ANY, p_key, LOWER },
{ p_key_colon, ' ', p_key_colon_sp, 0 },
{ p_key_colon_sp, ANY, p_value, SET_VALUE },
{ p_value, CR, p_value_cr, NULLIFY | STORE_KEY_VALUE },
{ p_value, ANY, p_value, 0 },
{ p_value_cr, LF, p_value_crlf, 0 },
{ p_value_crlf, CR, p_value_crlfcr, 0 },
{ p_value_crlf, ANY, p_key, SET_KEY | LOWER },
{ p_value_crlfcr, LF, p_content, SET_CONTENT_START },
{ p_error, ANY, p_error, 0 }
};
for( unsigned i = _parsedTo; i < _data.length(); ++i) {
char c = _data[i];
State nextState = p_error;
for (const FSM& f : fsm) {
if ( f.curState == _state &&
( c == f.c || f.c == ANY ) ) {
nextState = f.nextState;
if ( f.actions & LOWER ) {
_data[i] = tolower( _data[i] );
}
if ( f.actions & NULLIFY ) {
_data[i] = 0;
}
if ( f.actions & SET_HEADER_START ) {
_headerStart = i;
}
if ( f.actions & SET_KEY ) {
_keyIndex = i;
}
if ( f.actions & SET_VALUE ) {
_valueIndex = i;
}
if ( f.actions & SET_CONTENT_START ) {
_contentStart = i + 1;
}
if ( f.actions & STORE_KEY_VALUE ) {
// store position of first character of key.
_keys.push_back( _keyIndex );
}
break;
}
}
_state = nextState;
if ( _state == p_content ) {
const char* str = getValue("content-length");
if ( str ) {
_contentLength = atoi( str );
}
break;
}
}
_parsedTo = _data.length();
}
bool
HttpParser::parseRequestLine()
{
size_t sp1;
size_t sp2;
sp1 = _data.find( ' ', 0 );
if ( sp1 == std::string::npos ) return false;
sp2 = _data.find( ' ', sp1 + 1 );
if ( sp2 == std::string::npos ) return false;
_data[sp1] = 0;
_data[sp2] = 0;
_uriIndex = sp1 + 1;
return true;
}
HttpParser::status_t
HttpParser::addBytes( const char* bytes, unsigned len )
{
if ( _status != Incomplete ) {
return _status;
}
// append the bytes to data.
_data.append( bytes, len );
if ( _state < p_content ) {
parseHeader();
}
if ( _state == p_error ) {
_status = Error;
} else if ( _state == p_content ) {
if ( _contentLength == 0 || _data.length() - _contentStart >= _contentLength ) {
if ( parseRequestLine() ) {
_status = Done;
} else {
_status = Error;
}
}
}
return _status;
}
const char*
HttpParser::getMethod() const
{
return &_data[0];
}
const char*
HttpParser::getUri() const
{
return &_data[_uriIndex];
}
const char*
HttpParser::getQueryString() const
{
const char* pos = getUri();
while( *pos ) {
if ( *pos == '?' ) {
pos++;
break;
}
pos++;
}
return pos;
}
const char*
HttpParser::getBody() const
{
if ( _contentLength > 0 ) {
return &_data[_contentStart];
} else {
return NULL;
}
}
// key should be in lower case.
const char*
HttpParser::getValue( const char* key ) const
{
for( IntArray::const_iterator iter = _keys.begin();
iter != _keys.end(); ++iter )
{
unsigned index = *iter;
if ( strcmp( &_data[index], key ) == 0 ) {
return &_data[index + strlen(key) + 2];
}
}
return NULL;
}
unsigned
HttpParser::getContentLength() const
{
return _contentLength;
}
|
