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/*
* 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
*
* Copyright (C) 2011-2013 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "HttpParser.h"
HttpParser::HttpParser() :
_headerStart(0),
_bodyStart(0),
_parsedTo( 0 ),
_state( 0 ),
_keyIndex(0),
_valueIndex(0),
_contentLength(0),
_contentStart(0),
_uriIndex(0),
_status( Incomplete )
{
}
HttpParser::~HttpParser()
{
}
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 ( unsigned d = 0; d < sizeof(fsm) / sizeof(FSM); ++d ) {
if ( fsm[d].curState == _state &&
( c == fsm[d].c || fsm[d].c == ANY ) ) {
nextState = fsm[d].nextState;
if ( fsm[d].actions & LOWER ) {
_data[i] = tolower( _data[i] );
}
if ( fsm[d].actions & NULLIFY ) {
_data[i] = 0;
}
if ( fsm[d].actions & SET_HEADER_START ) {
_headerStart = i;
}
if ( fsm[d].actions & SET_KEY ) {
_keyIndex = i;
}
if ( fsm[d].actions & SET_VALUE ) {
_valueIndex = i;
}
if ( fsm[d].actions & SET_CONTENT_START ) {
_contentStart = i + 1;
}
if ( fsm[d].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;
}
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