parse.c

#include "parse.h"

/**
* Given a char buffer returns the parsed request headers
*/
Request * parse(char *buffer, int size, HTTPContext *context) {
  //Differant states in the state machine
	enum {
		STATE_START = 0, STATE_CR, STATE_CRLF, STATE_CRLFCR, STATE_CRLFCRLF
	};

	int i = 0, state;
	size_t offset = 0;
	char ch;
	char buf[8192];
	memset(buf, 0, 8192);

	state = STATE_START;
	while (state != STATE_CRLFCRLF)
	{
		char expected = 0;

		if (i == size)
			break;

		ch = buffer[i++];
		buf[offset++] = ch;

		switch (state) {
		case STATE_START:
		case STATE_CRLF:
			expected = '\r';
			break;
		case STATE_CR:
		case STATE_CRLFCR:
			expected = '\n';
			break;
		default:
			state = STATE_START;
			continue;
		}

		if (ch == expected)
			state++;
		else
			state = STATE_START;
	}

      //Valid End State
	if (state == STATE_CRLFCRLF)
    {
		Request *request = (Request *) malloc(sizeof(Request));
    	request->header_count=0;
    	request->headers = (Request_header *) malloc(sizeof(Request_header)*1);
		set_parsing_options(buf, i, request);

		if (yyparse() == SUCCESS)
        {
            return request;
		}
	}

    /* Handle Malformed Requests : set is valid to 0 and handle it in outer logic */
    context->is_valid = 0;
}