http_server/request_parser.cc at master · zhoubaozhou/http_server · GitHub

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#include "request_parser.h"
#include "request.h"

namespace http {
namespace server {

request_parser::request_parser()
    : state_ (method_start)
{
}

void request_parser::reset()
{
    state_ = method_start;
}

boost::tribool request_parser::consume(request& req, char input)
{
    switch (state_) {
    case method_start:
        if (!is_char(input) || is_ctl(input) || is_tspecial(input) ) {
            return false;
        } else {
            state_ = method;
            req.method.push_back(input);
            return boost::indeterminate;
        }
    case method:
        if (' ' == input) {
            state_ = uri;
            return boost::indeterminate;
        } else if (!is_char(input) || is_ctl(input) || is_tspecial(input) ) {
            return false;
        } else {
            req.method.push_back(input);
            return boost::indeterminate;
        }
    case uri:
        if (' ' == input) {
            state_ = http_version_h;
            return boost::indeterminate;
        } else if (is_ctl(input)) {
            return false;
        } else {
            req.uri.push_back(input);
            return boost::indeterminate;
        }
    case http_version_h:
        if ('H' == input) {
            state_ = http_version_t_1;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_t_1:
        if ('T' == input) {
            state_ = http_version_t_2;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_t_2:
        if ('T' == input) {
            state_ = http_version_p;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_p:
        if ('P' == input) {
            state_ = http_version_slash;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_slash:
        if ('/' == input) {
            req.http_version_major = 0;
            req.http_version_minor = 0;
            state_ = http_version_major_start;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_major_start:
        if (is_digit(input)) {
            req.http_version_major = req.http_version_major * 10 + input - '0';
            state_ = http_version_major;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_major:
        if ('.' == input) {
            state_ = http_version_minor_start;
            return boost::indeterminate;
        } else if (is_digit(input)) {
            req.http_version_major = req.http_version_major * 10 + input - '0';
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_minor_start:
        if (is_digit(input)) {
            req.http_version_minor = req.http_version_minor * 10 + input - '0';
            state_ = http_version_minor;
            return boost::indeterminate;
        } else {
            return false;
        }
    case http_version_minor:
        if ('\r' == input) {
            state_ = expecting_newline_1;
            return boost::indeterminate;
        } else if (is_digit(input)) {
            req.http_version_minor = req.http_version_minor * 10 + input - '0';
            return boost::indeterminate;
        } else {
            return false;
        }
    case expecting_newline_1:
        if ('\n' == input) {
            state_ = header_line_start;
            return boost::indeterminate;
        } else {
            return false;
        }
    case header_line_start:
        if ('\r' == input) {
            state_ = expecting_newline_3;
            return boost::indeterminate;
        } else if (!req.headers.empty() && (' ' == input || '\t' == input)) {
            state_ =header_lws;
            return boost::indeterminate;
        } else if (!is_char(input) || is_ctl(input) || is_tspecial(input)) {
            return false;
        } else {
            req.headers.push_back(header());
            req.headers.back().name.push_back(input);
            state_ = header_name;
            return boost::indeterminate;
        }
    case header_lws:
        if ('\r' == input) {
            state_ = expecting_newline_2;
            return boost::indeterminate;
        } else if (' ' == input || '\t' == input) {
            return boost::indeterminate;
        } else if (is_ctl(input)) {
            return false;
        } else {
            state_ = header_value;
            req.headers.back().value.push_back(input);
            return boost::indeterminate;
        }
    case header_name:
        if (':' == input) {
            state_ = space_before_header_value;
            return boost::indeterminate;
        } else if (!is_char(input) || is_ctl(input) || is_tspecial(input)) {
            return false;
        } else {
            req.headers.back().name.push_back(input);
            return boost::indeterminate;
        }
    case space_before_header_value:
        if (' ' == input) {
            state_ = header_value;
            return boost::indeterminate;
        } else {
            return false;
        }
    case header_value:
        if ('\r' == input) {
            state_ = expecting_newline_2;
            return boost::indeterminate;
        } else if (is_ctl(input)) {
            return false;
        } else {
            req.headers.back().value.push_back(input);
            return boost::indeterminate;
        }
    case expecting_newline_2:
        if ('\n' == input) {
            state_ = header_line_start;
            return boost::indeterminate;
        } else {
            return false;
        }
    case expecting_newline_3:
        return ('\n' == input);
    default:
        return false;
    }
}

bool request_parser::is_char(int c)
{
    return c >= 0 && c <= 127;
}

bool request_parser::is_ctl(int c)
{
    return (c >= 0 && c <= 31) || (127 == c);
}

bool request_parser::is_tspecial(int c)
{
    switch(c) {
    case '(': case ')': case '<': case '>': case '@':
    case ',': case ';': case ':': case '\\': case '"':
    case '/': case '[': case ']': case '?': case '=':
    case '{': case '}': case ' ': case '\t':
        return true;
    default:
        return false;
    }
}

bool request_parser::is_digit(int c)
{
    return c >= '0' && c <= '9';
}


};
};