comparison mercurial/revlog.py @ 47386:0d0fb091c49f

revlog: simplify "partial read" error message

We are about to reuse this message in more places and the current handling is
pretty hard to read. So we eat two pie with one stone and clean up this.

Differential Revision: https://phab.mercurial-scm.org/D10784

47385:9d9eb22b9b69

# corresponds to uncompressed length of indexformatng (2 gigs, 4-byte
# signed integer)
_maxentrysize = 0x7FFFFFFF


class revlog(object):
    """
    the underlying revision storage object

        self._cachesegment(realoffset, d)
        if offset != realoffset or reallength != length:
            startoffset = offset - realoffset
            if len(d) - startoffset < length:
                raise error.RevlogError(
                    _(
                        b'partial read of revlog %s; expected %d bytes from '
                        b'offset %d, got %d'
                    )
                    % (
                        self._indexfile if self._inline else self._datafile,
                        length,
                        offset,
                        len(d) - startoffset,
                    )
                )

            return util.buffer(d, startoffset, length)

        if len(d) < length:
            raise error.RevlogError(
                _(
                    b'partial read of revlog %s; expected %d bytes from offset '
                    b'%d, got %d'
                )
                % (
                    self._indexfile if self._inline else self._datafile,
                    length,
                    offset,
                    len(d),
                )
            )

        return d

    def _getsegment(self, offset, length, df=None):
        """Obtain a segment of raw data from the revlog.

47386:0d0fb091c49f

# corresponds to uncompressed length of indexformatng (2 gigs, 4-byte
# signed integer)
_maxentrysize = 0x7FFFFFFF

PARTIAL_READ_MSG = _(
    b'partial read of revlog %s; expected %d bytes from offset %d, got %d'
)


class revlog(object):
    """
    the underlying revision storage object

        self._cachesegment(realoffset, d)
        if offset != realoffset or reallength != length:
            startoffset = offset - realoffset
            if len(d) - startoffset < length:
                filename = self._indexfile if self._inline else self._datafile
                got = len(d) - startoffset
                m = PARTIAL_READ_MSG % (filename, length, offset, got)
                raise error.RevlogError(m)
            return util.buffer(d, startoffset, length)

        if len(d) < length:
            filename = self._indexfile if self._inline else self._datafile
            got = len(d) - startoffset
            m = PARTIAL_READ_MSG % (filename, length, offset, got)
            raise error.RevlogError(m)

        return d

    def _getsegment(self, offset, length, df=None):
        """Obtain a segment of raw data from the revlog.