src/http/request/parser/parse.c

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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>

#include "http/request_parser.h"
#include "interface/class.h"


#define REMAINS(pars,done) \
        ((pars)->buffer_used - ((done) - (pars)->buffer))


static
inline
char *
httpRequestParserGetLine(char ** data)
{
        char * line_end = strstr(*data, "\r\n");
        char * ret      = *data;

        if (NULL == line_end) {
                return NULL;
        }

        *line_end = 0;
        *data = line_end + 2;

        return ret;
}

static
inline
void
httpRequestSkip(char ** data)
{
        for (; 0 != **data && ! isalpha(**data); (*data)++);
}

void httpRequestParserGetRequestLine(HttpRequest, char *);

void
httpRequestParserParse(HttpRequestParser this)
{
        static HttpRequest request  = NULL;
        static char *      data; // static pointer to unprocessed data
        char *             line;
        int                cont = 1;

        while(cont) {
                switch(this->state) {
                        case HTTP_REQUEST_GARBAGE:
                                data = this->buffer; // initialize static pointer
                                httpRequestSkip(&data);
                                request = new(HttpRequest);

                                this->state = HTTP_REQUEST_START;
                                break;

                        case HTTP_REQUEST_START:
                                if (NULL == (line = httpRequestParserGetLine(&data))) {
                                        cont = 0;
                                        break;
                                }
                                
                                httpRequestParserGetRequestLine(request, line);

                                this->state = HTTP_REQUEST_REQUEST_LINE_DONE;
                                break;

                        case HTTP_REQUEST_REQUEST_LINE_DONE:
                                if (NULL == (line = httpRequestParserGetLine(&data))) {
                                        cont = 0;
                                        break;
                                }

                                if (0 == strlen(line)) {
                                        this->state = HTTP_REQUEST_HEADERS_DONE;
                                        break;
                                }

                                httpRequestParserGetHeader(request, line);
                                break;

                        case HTTP_REQUEST_HEADERS_DONE:
                                httpHeaderSort(request->header, request->nheader);

                                {
                                        char * nbody;

                                        if (0 == request->nbody) {
                                                nbody = httpHeaderGet(
                                                                request->header,
                                                                request->nheader,
                                                                "Content-Length");

                                                if (NULL == nbody) {
                                                        this->state = HTTP_REQUEST_DONE;
                                                        break;
                                                }
                                                else {
                                                        request->nbody = atoi(nbody);
                                                }
                                        }

                                        if (REMAINS(this, data) >= request->nbody) {
                                                request->body = calloc(1, request->nbody + 1);
                                                memcpy(request->body, data, request->nbody);
                                                data += request->nbody;
                                                this->state = HTTP_REQUEST_DONE;
                                        }
                                }
                                        
                                break;

                        case HTTP_REQUEST_DONE:
                                this->request_queue->requests[(this->request_queue->nrequests)++] =
                                        request;

                                memmove(this->buffer, data, REMAINS(this, data));

                                this->buffer_used -= data - this->buffer;

                                if (0 == this->buffer_used) {
                                        cont = 0;
                                }

                                this->state = HTTP_REQUEST_GARBAGE;

                                break;

                        default:
                                break;
                }
        }
}

// vim: set ts=4 sw=4: