comparison mercurial/obsolete.py @ 32689:9933410bf763

obsstore: move marker version reading to a separate function

This allows us to read marker version without reading markers.

32688:2c1400d43fd2

# mapping to read/write various marker formats
# <version> -> (decoder, encoder)
formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
           _fm1version: (_fm1readmarkers, _fm1encodeonemarker)}

@util.nogc
def _readmarkers(data):
    """Read and enumerate markers from raw data"""
    off = 0
    diskversion = _unpack('>B', data[off:off + 1])[0]
    off += 1
    if diskversion not in formats:
        msg = _('parsing obsolete marker: unknown version %r') % diskversion
        raise error.UnknownVersion(msg, version=diskversion)
    return diskversion, formats[diskversion][0](data, off)

32689:9933410bf763

# mapping to read/write various marker formats
# <version> -> (decoder, encoder)
formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
           _fm1version: (_fm1readmarkers, _fm1encodeonemarker)}

def _readmarkerversion(data):
    return _unpack('>B', data[0:1])[0]

@util.nogc
def _readmarkers(data):
    """Read and enumerate markers from raw data"""
    diskversion = _readmarkerversion(data)
    off = 1
    if diskversion not in formats:
        msg = _('parsing obsolete marker: unknown version %r') % diskversion
        raise error.UnknownVersion(msg, version=diskversion)
    return diskversion, formats[diskversion][0](data, off)