Function http_seek

libavformat/http.c:404–438

}

static int64_t http_seek(URLContext *h, int64_t off, int whence)
{
    HTTPContext *s = h->priv_data;
    URLContext *old_hd = s->hd;
    int64_t old_off = s->off;
    uint8_t old_buf[BUFFER_SIZE];
    int old_buf_size;

    if (whence == AVSEEK_SIZE)
        return s->filesize;
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
        return -1;

    /* we save the old context in case the seek fails */
    old_buf_size = s->buf_end - s->buf_ptr;
    memcpy(old_buf, s->buf_ptr, old_buf_size);
    s->hd = NULL;
    if (whence == SEEK_CUR)
        off += s->off;
    else if (whence == SEEK_END)
        off += s->filesize;
    s->off = off;

    /* if it fails, continue on old connection */
    if (http_open_cnx(h) < 0) {
        memcpy(s->buffer, old_buf, old_buf_size);
        s->buf_ptr = s->buffer;
        s->buf_end = s->buffer + old_buf_size;
        s->hd = old_hd;
        s->off = old_off;
        return -1;
    }
    url_close(old_hd);
    return off;
}

static int
http_get_file_handle(URLContext *h)