mercurial/revlog.py

20179:5bb3826bdac4

        self.datafile = indexfile[:-2] + ".d"
        self.opener = opener
        self._cache = None
        self._basecache = None
        self._chunkcache = (0, '')
        self.index = []
        self._pcache = {}
        self._nodecache = {nullid: nullrev}
        self._nodepos = None

            if 'revlogv1' in opts:
                if 'generaldelta' in opts:
                    v |= REVLOGGENERALDELTA
            else:
                v = 0

        i = ''
        self._initempty = True
        try:
            f = self.opener(self.indexfile)

            df = self.opener(self.datafile)

        # Cache data both forward and backward around the requested
        # data, in a fixed size window. This helps speed up operations
        # involving reading the revlog backwards.
        realoffset = offset & ~65535
        reallength = ((offset + length + 65536) & ~65535) - realoffset
        df.seek(realoffset)
        d = df.read(reallength)
        df.close()
        self._addchunk(realoffset, d)
        if offset != realoffset or reallength != length:

20180:969148b49fc6

        self.datafile = indexfile[:-2] + ".d"
        self.opener = opener
        self._cache = None
        self._basecache = None
        self._chunkcache = (0, '')
        self._chunkcachesize = 65536
        self.index = []
        self._pcache = {}
        self._nodecache = {nullid: nullrev}
        self._nodepos = None

            if 'revlogv1' in opts:
                if 'generaldelta' in opts:
                    v |= REVLOGGENERALDELTA
            else:
                v = 0
            if 'chunkcachesize' in opts:
                self._chunkcachesize = opts['chunkcachesize']

        if self._chunkcachesize <= 0:
            raise RevlogError(_('revlog chunk cache size %r is not greater '
                                'than 0') % self._chunkcachesize)
        elif self._chunkcachesize & (self._chunkcachesize - 1):
            raise RevlogError(_('revlog chunk cache size %r is not a power '
                                'of 2') % self._chunkcachesize)

        i = ''
        self._initempty = True
        try:
            f = self.opener(self.indexfile)

            df = self.opener(self.datafile)

        # Cache data both forward and backward around the requested
        # data, in a fixed size window. This helps speed up operations
        # involving reading the revlog backwards.
        cachesize = self._chunkcachesize
        realoffset = offset & ~(cachesize - 1)
        reallength = (((offset + length + cachesize) & ~(cachesize - 1))
                      - realoffset)
        df.seek(realoffset)
        d = df.read(reallength)
        df.close()
        self._addchunk(realoffset, d)
        if offset != realoffset or reallength != length: