mutagen/ogg.py
def replace(cls, fileobj, old_pages, new_pages):
        """Replace old_pages with new_pages within fileobj.

        old_pages must have come from reading fileobj originally.
        new_pages are assumed to have the 'same' data as old_pages,
        and so the serial and sequence numbers will be copied, as will
        the flags for the first and last pages.

        fileobj will be resized and pages renumbered as necessary. As
        such, it must be opened r+b or w+b.
        """

        # Number the new pages starting from the first old page.
        first = old_pages[0].sequence
        for page, seq in zip(new_pages, range(first, first + len(new_pages))):
            page.sequence = seq
            page.serial = old_pages[0].serial

        new_pages[0].first = old_pages[0].first
        new_pages[0].last = old_pages[0].last
        new_pages[0].continued = old_pages[0].continued

        new_pages[-1].first = old_pages[-1].first
        new_pages[-1].last = old_pages[-1].last
        new_pages[-1].complete = old_pages[-1].complete
        if not new_pages[-1].complete and len(new_pages[-1].packets) == 1:
            new_pages[-1].position = -1

        new_data = b''.join(cls.write(p) for p in new_pages)

        # Make room in the file for the new data.
        delta = len(new_data)
        fileobj.seek(old_pages[0].offset, 0)
        insert_bytes(fileobj, delta, old_pages[0].offset)
        fileobj.seek(old_pages[0].offset, 0)
        fileobj.write(new_data)
        new_data_end = old_pages[0].offset + delta

        # Go through the old pages and delete them. Since we shifted
        # the data down the file, we need to adjust their offsets. We
        # also need to go backwards, so we don't adjust the deltas of
        # the other pages.
        old_pages.reverse()
        for old_page in old_pages:
            adj_offset = old_page.offset + delta
            delete_bytes(fileobj, old_page.size, adj_offset)

        # Finally, if there's any discrepency in length, we need to
        # renumber the pages for the logical stream.
        if len(old_pages) != len(new_pages):
            fileobj.seek(new_data_end, 0)
            serial = new_pages[-1].serial
            sequence = new_pages[-1].sequence + 1
            cls.renumber(fileobj, serial, sequence)
def replace(cls, fileobj, old_pages, new_pages):
        # Number the new pages starting from the first old page.
        first = old_pages[0].sequence
        for page, seq in zip(new_pages, range(first, first + len(new_pages))):
            page.sequence = seq
            page.serial = old_pages[0].serial

        new_pages[0].first = old_pages[0].first
        new_pages[0].last = old_pages[0].last
        new_pages[0].continued = old_pages[0].continued

        new_pages[-1].first = old_pages[-1].first
        new_pages[-1].last = old_pages[-1].last
        new_pages[-1].complete = old_pages[-1].complete
        if not new_pages[-1].complete and len(new_pages[-1].packets) == 1:
            new_pages[-1].position = -1

        new_data = b''.join(cls.write(p) for p in new_pages)

        # Make room in the file for the new data.
        delta = len(new_data)
        fileobj.seek(old_pages[0].offset, 0)
        insert_bytes(fileobj, delta, old_pages[0].offset)
        fileobj.seek(old_pages[0].offset, 0)
        fileobj.write(new_data)
        new_data_end = old_pages[0].offset + delta

        # Go through the old pages and delete them. Since we shifted
        # the data down the file, we need to adjust their offsets. We
        # also need to go backwards, so we don't adjust the deltas of
        # the other pages.
        old_pages.reverse()
        for old_page in old_pages:
            adj_offset = old_page.offset + delta
            delete_bytes(fileobj, old_page.size, adj_offset)

        # Finally, if there's any discrepency in length, we need to
        # renumber the pages for the logical stream.
        if len(old_pages) != len(new_pages):
            fileobj.seek(new_data_end, 0)
            serial = new_pages[-1].serial
            sequence = new_pages[-1].sequence + 1
            cls.renumber(fileobj, serial, sequence)
def replace ( cls , fileobj , old_pages , new_pages ) : # Number the new pages starting from the first old page. first = old_pages [ 0 ] . sequence for page , seq in zip ( new_pages , range ( first , first + len ( new_pages ) ) ) : page . sequence = seq page . serial = old_pages [ 0 ] . serial new_pages [ 0 ] . first = old_pages [ 0 ] . first new_pages [ 0 ] . last = old_pages [ 0 ] . last new_pages [ 0 ] . continued = old_pages [ 0 ] . continued new_pages [ - 1 ] . first = old_pages [ - 1 ] . first new_pages [ - 1 ] . last = old_pages [ - 1 ] . last new_pages [ - 1 ] . complete = old_pages [ - 1 ] . complete if not new_pages [ - 1 ] . complete and len ( new_pages [ - 1 ] . packets ) == 1 : new_pages [ - 1 ] . position = - 1 new_data = b'' . join ( cls . write ( p ) for p in new_pages ) # Make room in the file for the new data. delta = len ( new_data ) fileobj . seek ( old_pages [ 0 ] . offset , 0 ) insert_bytes ( fileobj , delta , old_pages [ 0 ] . offset ) fileobj . seek ( old_pages [ 0 ] . offset , 0 ) fileobj . write ( new_data ) new_data_end = old_pages [ 0 ] . offset + delta # Go through the old pages and delete them. Since we shifted # the data down the file, we need to adjust their offsets. We # also need to go backwards, so we don't adjust the deltas of # the other pages. old_pages . reverse ( ) for old_page in old_pages : adj_offset = old_page . offset + delta delete_bytes ( fileobj , old_page . size , adj_offset ) # Finally, if there's any discrepency in length, we need to # renumber the pages for the logical stream. if len ( old_pages ) != len ( new_pages ) : fileobj . seek ( new_data_end , 0 ) serial = new_pages [ - 1 ] . serial sequence = new_pages [ - 1 ] . sequence + 1 cls . renumber ( fileobj , serial , sequence )
Replace old_pages with new_pages within fileobj.

        old_pages must have come from reading fileobj originally.
        new_pages are assumed to have the 'same' data as old_pages,
        and so the serial and sequence numbers will be copied, as will
        the flags for the first and last pages.

        fileobj will be resized and pages renumbered as necessary. As
        such, it must be opened r+b or w+b.
Replace old_pages with new_pages within fileobj .