http/parser/parse.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * 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 3 of the License, 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>

#include "class.h"
#include "cbuf.h"
#include "stream.h"
#include "queue.h"

#include "http/parser.h"
#include "http/header.h"
#include "http/interface/http_intro.h"

#include "utils/memory.h"
#include "commons.h"

#define MIN(a,b)    ((a)<(b)? (a) : (b))


ssize_t
httpParserParse(void * _this, Stream st)
{
    HttpParser this = _this;
    int        cont = 1;
    ssize_t    read;
    char *     line;
    char *     line_end;

    if (cbufIsLocked(this->buffer)) {
        if (FALSE == this->ourLock)
            return 0;
    }
    else {
        cbufLock(this->buffer);
        this->ourLock = TRUE;
    }

    if (NULL != this->incomplete) {
        cbufSetData(this->buffer, this->incomplete, this->isize);
        MEM_FREE(this->incomplete);
    }

    if (0 > (read = cbufRead(this->buffer, st))) {
        cbufRelease(this->buffer);
        this->ourLock = FALSE;
        return read;
    }

    while (cont) {
        switch(this->state) {
            case HTTP_MESSAGE_GARBAGE:
                cbufSkipNonAlpha(this->buffer);
                if (! cbufIsEmpty(this->buffer)) {
                    this->state = HTTP_MESSAGE_START;
                }
                else {
                    cbufRelease(this->buffer);
                    this->ourLock = FALSE;
                    cont          = 0;
                    break;
                }

            case HTTP_MESSAGE_START:
                if (NULL == (line = cbufGetLine(this->buffer, &line_end))) {
                    if (! cbufIsEmpty(this->buffer)) {
                        this->isize      = this->buffer->bused;
                        this->incomplete = memMalloc(this->isize);
                        memcpy(this->incomplete,
                                cbufGetData(this->buffer, this->isize),
                                this->isize);
                    }
                    cbufRelease(this->buffer);
                    this->ourLock = FALSE;
                    cont = 0;
                    break;
                }
                
                httpParserNewMessage(this, line, line_end);
                if (NULL == this->current) {
                    cbufRelease(this->buffer);
                    this->ourLock = FALSE;
                    return -2; // a server error occured can't process...
                }
                httpParserRequestVars(this);

                this->state = HTTP_MESSAGE_INTRO_DONE;

            case HTTP_MESSAGE_INTRO_DONE:
                if (NULL == (line = cbufGetLine(this->buffer, &line_end))) {
                    if (! cbufIsEmpty(this->buffer)) {
                        this->isize      = this->buffer->bused;
                        this->incomplete = memMalloc(this->isize);
                        memcpy(this->incomplete,
                                cbufGetData(this->buffer, this->isize),
                                this->isize);
                    }
                    cbufRelease(this->buffer);
                    this->ourLock = FALSE;
                    cont = 0;
                    break;
                }

                if (0 != strlen(line)) {
                    httpParserHeader(this, line, line_end);
                    break;
                }

                this->state = HTTP_MESSAGE_HEADERS_DONE;

            case HTTP_MESSAGE_HEADERS_DONE:
                if (this->current->dbody == this->current->nbody) {
                    this->state = HTTP_MESSAGE_DONE;
                } else {
                    if (cbufIsEmpty(this->buffer)) {
                        cbufRelease(this->buffer);
                        this->ourLock = FALSE;
                        cont = 0;
                        break;
                    }

                    cbufIncRead(
                            this->buffer,
                            httpParserBody(
                                this,
                                cbufGetRead(this->buffer),
                                this->buffer->bused));

                    break;
                }

            case HTTP_MESSAGE_DONE:
                {
                    HttpHeader enc = hashGet(
                            this->current->header,
                            CSTRA("content-type"));

                    /**
                     * do we have form data??
                     */
                    if (NULL != enc && 0 == strncasecmp(
                                "application/x-www-form-urlencoded",
                                enc->value[0],
                                MIN(sizeof("application/x-www-form-urlencoded")-1,
                                    enc->nvalue[0]))) {
                        //!> then parse them...
                        httpParserPostVars(this);
                    }

                    /**
                     * enqueue current request
                     */
                    queuePut(this->queue, this->current);
                    this->current = NULL;

                    /**
                     * prepare for next request
                     */
                    this->state = HTTP_MESSAGE_GARBAGE;
                }
                break;

            default:
                break;
        }
    }

    return this->queue->nmsg;
}

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