asset/asset.c

Go to the documentation of this file.

/**
 * \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 <stdarg.h>

// for mmap
#include <sys/mman.h>

// for open and fstat
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

// for access
#include <unistd.h>

// for localtime
#include <time.h>


#include "class.h"
#include "asset.h"
#include "hash.h"

#include "utils/mime_type.h"
#include "utils/hash.h"
#include "utils/http.h"


static
int
assetCtor(void * _this, va_list * params)
{
    Asset this = _this;

    struct tm   * tmp;
    struct stat   st;
    char        * fname = va_arg(*params, char*);
    char        * ext;

    this->nfname = va_arg(*params, size_t);

    strncpy(this->fname, fname, 2048);
    this->fname[2048] = '\0';

    this->hash = sdbm(
            (unsigned char *)this->fname,
            this->nfname);

    if (-1 == access(this->fname, R_OK)) {
        return -1;
    } else {
        this->handle = open(this->fname, O_RDONLY);
        fstat(this->handle, &st);
    }

    tmp          = localtime(&(st.st_mtime));
    this->netag  = strftime(this->etag, sizeof(this->etag), "%s", tmp);
    this->nmtime = rfc1123Gmt(
            this->mtime,
            sizeof(this->mtime),
            &(st.st_mtime));

    this->size = st.st_size;

    ext = strrchr(this->fname, '.');
    if (NULL != ext) {
        ext++;
        this->mime_type = getMimeType(ext, strlen(ext));
    } else {
        this->mime_type = "application/octet-stream";
    }

    if (NULL != this->mime_type) {
        this->nmime_type = strlen(this->mime_type);
    } else {
        this->nmime_type = 0;
    }

    if (0 < this->size) {
        this->data = mmap(
                NULL, this->size, PROT_READ, MAP_PRIVATE, this->handle, 0);

        if (MAP_FAILED == this->data) {
            close(this->handle);
            return -1;
        }
    }

    this->ref_count = 1;

    return 0;
}

static void assetDtor(void * _this) {
    Asset this = _this;

    if (MAP_FAILED != this->data && NULL != this->data) {
        munmap(this->data, this->size);
    }

    if (0 < this->handle) {
        close(this->handle);
    }
}

static
unsigned long
assetGetHash(void * _this)
{
    Asset this = _this;

    return this->hash;
}

static
void
assetHandleDouble(void * _this, void * _doub)
{
}

INIT_IFACE(Class, assetCtor, assetDtor, NULL);
INIT_IFACE(Hashable, assetGetHash, assetHandleDouble);
CREATE_CLASS(Asset, NULL, IFACE(Class), IFACE(Hashable));

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