def getvarsize1B(data, offset):
if IS_BIGENDIAN:
return pgstruct.getubyte(
data, offset + memoffset['varattrib_1b.va_header']) & 0x7F
else:
return (pgstruct.getubyte(
data, offset + memoffset['varattrib_1b.va_header']) >> 1) & 0x7F
def getvarsize4B(data, offset):
if IS_BIGENDIAN:
return pgstruct.getubyte(
data,
offset + memoffset['varattrib_4b.va_4byte.va_header']) & 0x3FFFFFFF
else:
return (pgstruct.getubyte(
data, offset + memoffset['varattrib_4b.va_4byte.va_header']) >>
2) & 0x3FFFFFFF
def load(self, pagedata, tupleoff, heaptuplemode=True):
if heaptuplemode:
self.xmin = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['HeapTupleFields.t_xmin'])
self.xmax = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['HeapTupleFields.t_xmax'])
self.field3 = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['HeapTupleFields.t_field3'])
else:
self.datum_len_ = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['DatumTupleFields.datum_len_'])
self.datum_typmod = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['DatumTupleFields.datum_typmod'])
self.datum_typeid = pgstruct.getuint(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_heap'] +
memoffset['DatumTupleFields.datum_typeid'])
self.ctid_blkid_hi = pgstruct.getushort(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_ctid'] +
memoffset['ItemPointerData.ip_blkid'] +
memoffset['BlockIdData.bi_hi'])
self.ctid_blkid_lo = pgstruct.getushort(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_ctid'] +
memoffset['ItemPointerData.ip_blkid'] +
memoffset['BlockIdData.bi_lo'])
self.ctid_posid = pgstruct.getushort(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_ctid'] +
memoffset['ItemPointerData.ip_posid'])
self.infomask2 = pgstruct.getushort(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_infomask2'])
self.infomask = pgstruct.getushort(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_infomask'])
self.hoff = pgstruct.getubyte(
pagedata, tupleoff + memoffset['HeapTupleHeaderData.t_hoff'])
hasoid = (self.infomask & HeapTuple.HEAP_HASOID) != 0
hasnull = (self.infomask & HeapTuple.HEAP_HASNULL) != 0
if hasnull:
nullbitlen = self.hoff - memoffset[
'HeapTupleHeaderData.t_bits'] - (4 if hasoid else 0)
self.bits = ctypes.string_at(
ctypes.byref(
pagedata,
tupleoff + memoffset['HeapTupleHeaderData.t_bits']),
nullbitlen)
else:
nullbitlen = 0
self.bits = None
if hasoid:
self.oid = pgstruct.getuint(pagedata, tupleoff + self.hoff - 4)
else:
self.oid = None
def get_transid_status(self, xid):
pageno = xid / self.CLOG_XACTS_PER_PAGE
byteno = (xid % self.CLOG_XACTS_PER_PAGE) / self.CLOG_XACTS_PER_BYTE
bshift = (xid % self.CLOG_XACTS_PER_BYTE) * self.CLOG_BITS_PER_XACT
try:
blockdata = self.getlrupage(pageno).data
except UPgException:
return TRANSACTION_STATUS_NOTFOUND
bytevalue = pgstruct.getubyte(blockdata, byteno)
status = (bytevalue >> bshift) & self.CLOG_XACT_BITMASK;
return status
def get_transid_status(self, xid):
pageno = xid / self.CLOG_XACTS_PER_PAGE
byteno = (xid % self.CLOG_XACTS_PER_PAGE) / self.CLOG_XACTS_PER_BYTE
bshift = (xid % self.CLOG_XACTS_PER_BYTE) * self.CLOG_BITS_PER_XACT
try:
blockdata = self.getlrupage(pageno).data
except UPgException:
return TRANSACTION_STATUS_NOTFOUND
bytevalue = pgstruct.getubyte(blockdata, byteno)
status = (bytevalue >> bshift) & self.CLOG_XACT_BITMASK
return status
def load(self, pagedata, tupleoff, heaptuplemode = True):
if heaptuplemode:
self.xmin = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['HeapTupleFields.t_xmin'])
self.xmax = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['HeapTupleFields.t_xmax'])
self.field3 = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['HeapTupleFields.t_field3'])
else:
self.datum_len_ = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['DatumTupleFields.datum_len_'])
self.datum_typmod = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['DatumTupleFields.datum_typmod'])
self.datum_typeid = pgstruct.getuint(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_heap']+memoffset['DatumTupleFields.datum_typeid'])
self.ctid_blkid_hi = pgstruct.getushort(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_ctid']
+memoffset['ItemPointerData.ip_blkid'] + memoffset['BlockIdData.bi_hi'])
self.ctid_blkid_lo = pgstruct.getushort(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_ctid']
+memoffset['ItemPointerData.ip_blkid'] + memoffset['BlockIdData.bi_lo'])
self.ctid_posid = pgstruct.getushort(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_ctid']
+memoffset['ItemPointerData.ip_posid'])
self.infomask2 = pgstruct.getushort(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_infomask2'])
self.infomask = pgstruct.getushort(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_infomask'])
self.hoff = pgstruct.getubyte(pagedata,
tupleoff+memoffset['HeapTupleHeaderData.t_hoff'])
hasoid = (self.infomask & HeapTuple.HEAP_HASOID) != 0
hasnull = (self.infomask & HeapTuple.HEAP_HASNULL) != 0
if hasnull:
nullbitlen = self.hoff - memoffset['HeapTupleHeaderData.t_bits']- (4 if hasoid else 0)
self.bits = ctypes.string_at(ctypes.byref(pagedata, tupleoff+memoffset['HeapTupleHeaderData.t_bits']), nullbitlen)
else:
nullbitlen = 0
self.bits = None
if hasoid:
self.oid = pgstruct.getuint(pagedata, tupleoff+ self.hoff - 4)
else:
self.oid = None
def getvartype(data, offset):
b = pgstruct.getubyte(data, offset)
if IS_BIGENDIAN:
if b & 0x80 == 0:
return '4B'
if b & 0xC0 == 0:
return '4B_U'
if b & 0xC0 == 0x40:
return '4B_C'
if b & 0x80 == 0x80:
return '1B'
if b == 0x80:
return '1B_E'
else:
if b & 0x01 == 0:
return '4B'
if b & 0x03 == 0:
return '4B_U'
if b & 0x03 == 0x02:
return '4B_C'
if b & 0x03 == 0x01:
return '1B'
if b == 0x01:
return '1B_E'
def boolout(data, off, len):
if pgstruct.getubyte(data, off) != 0:
return 'True'
else:
return 'False'
def getexternalsize(data, offset):
tag = pgstruct.getubyte(data, offset + memoffset['varattrib_1b_e.va_tag'])
return memoffset['varattrib_1b_e.va_data'] + typesize[
'varatt_indirect'] if tag == VARTAG_INDIRECT else typesize[
'varatt_external']
def attisnull(self, attrnum):
return not (pgstruct.getubyte(self.bits, attrnum >> 3) & (1 << ((attrnum) & 0x07)))
def boolout(data, off, len):
if pgstruct.getubyte(data, off) != 0:
return 'True'
else:
return 'False'
def attisnull(self, attrnum):
return not (pgstruct.getubyte(self.bits, attrnum >> 3) &
(1 << ((attrnum) & 0x07)))