comparison mercurial/revlog.py @ 47249:130c9f7ed914

revlog: add a "data compression mode" entry in the index tuple

That will make it possible to keep track of compression information in the
revlog index, opening the way to more efficient revision restoration (in native
code, but the python usage is already defeating performance work).

We start with adding a new entry to the index tuple, using a value matching the
current behavior. We will introduce storage and other value in later changesets.

Differential Revision: https://phab.mercurial-scm.org/D10646

47248:013c645dd28c

)
from .i18n import _
from .pycompat import getattr
from .revlogutils.constants import (
    ALL_KINDS,
    FEATURES_BY_VERSION,
    FLAG_GENERALDELTA,
    FLAG_INLINE_DATA,
    INDEX_HEADER,
    REVLOGV0,

    [8] sidedata offset:
            The byte index of the start of the revision's side-data chunk.

    [9] sidedata chunk length:
            The size, in bytes, of the revision's side-data chunk.
    """

    _flagserrorclass = error.RevlogError

    def __init__(

            p1r,
            p2r,
            node,
            sidedata_offset,
            len(serialized_sidedata),
        )

        self.index.append(e)
        entry = self.index.entry_binary(curr)
        if curr == 0 and self._docket is None:

47249:130c9f7ed914

)
from .i18n import _
from .pycompat import getattr
from .revlogutils.constants import (
    ALL_KINDS,
    COMP_MODE_INLINE,
    FEATURES_BY_VERSION,
    FLAG_GENERALDELTA,
    FLAG_INLINE_DATA,
    INDEX_HEADER,
    REVLOGV0,

    [8] sidedata offset:
            The byte index of the start of the revision's side-data chunk.

    [9] sidedata chunk length:
            The size, in bytes, of the revision's side-data chunk.

    [10] data compression mode:
            two bits that detail the way the data chunk is compressed on disk.
            (see "COMP_MODE_*" constants for details). For revlog version 0 and
            1 this will always be COMP_MODE_INLINE.

    """

    _flagserrorclass = error.RevlogError

    def __init__(

            p1r,
            p2r,
            node,
            sidedata_offset,
            len(serialized_sidedata),
            COMP_MODE_INLINE,
        )

        self.index.append(e)
        entry = self.index.entry_binary(curr)
        if curr == 0 and self._docket is None: