Synnefo

        backend.update_object_meta(request.user, v_container, v_object, meta, replace=True)

    try:

        prev_meta = backend.get_object_meta(request.user, v_container, v_object)

    except NameError:

        raise ItemNotFound('Object does not exist')

    # Handle metadata changes.

    # A Content-Type or Content-Range header may indicate data updates.

    if content_type and content_type.startswith('multipart/byteranges'):

        # TODO: Support multiple update ranges.

        return HttpResponse(status=202)

    # Single range update. Range must be in Content-Range.

    # (with the addition that '*' is allowed for the range - will append).

    if content_type and content_type != 'application/octet-stream':

        return HttpResponse(status=202)

    # Require either a Content-Length, or 'chunked' Transfer-Encoding.

    content_length = -1

    if request.META.get('HTTP_TRANSFER_ENCODING') != 'chunked':

        content_length = get_content_length(request)

    try:

        # TODO: Also check for IndexError.

        size, hashmap = backend.get_object_hashmap(request.user, v_container, v_object)

    except NameError:

        raise ItemNotFound('Object does not exist')

    offset, length, total = ranges

    if offset is None:

        offset = size

    if length is None:

        length = content_length # Nevermind the error.

    elif length != content_length:

        raise BadRequest('Content length does not match range length')

    if total is not None and (total != size or offset >= size or (length > 0 and offset + length >= size)):

        raise RangeNotSatisfiable('Supplied range will change provided object limits')

    sock = raw_input_socket(request)

    data = ''

    for d in socket_read_iterator(sock, length, backend.block_size):

        # TODO: Raise 408 (Request Timeout) if this takes too long.

        # TODO: Raise 499 (Client Disconnect) if a length is defined and we stop before getting this much data.

        data += d

        bi = int(offset / backend.block_size)

        bo = offset % backend.block_size

        bl = min(len(data), backend.block_size - bo)

        offset += bl

        h = backend.update_block(hashmap[bi], data[:bl], bo)

        if bi < len(hashmap):

            hashmap[bi] = h

        else:

            hashmap.append(h)

        data = data[bl:]

    if len(data) > 0:

        bi = int(offset / backend.block_size)

        offset += len(data)

        h = backend.update_block(hashmap[bi], data)

        if bi < len(hashmap):

            hashmap[bi] = h

        else:

            hashmap.append(h)

    if offset > size:

        size = offset

    try:

        backend.update_object_hashmap(request.user, v_container, v_object, size, hashmap)

    except NameError:

        raise ItemNotFound('Container does not exist')

    # Update ETag.

    # TODO: Decide on the new ETag to use here.

    meta = {}

    md5 = hashlib.md5()

    md5.update(str(hashmap))

    meta['hash'] = md5.hexdigest().lower()

    try:

        backend.update_object_meta(request.user, v_container, v_object, meta)

    except NameError:

        raise ItemNotFound('Object does not exist')