def fromRawData(self, rawFieldDef, startPos): '''system: decode dbf field definition from 32-byte raw dbf data jjk 02/18/98''' self.name = strutil.unzfill(rawFieldDef[:11]) dataAddress = binnum.unsigned_from_Intel4(rawFieldDef[12:16]) self.length = ord(rawFieldDef[16]) self.start = startPos self.end = startPos + self.length self.decimalCount = ord(rawFieldDef[17])
def _fromRawData(self, rawData): '''private: instantiate the receiver from dbf 32-byte raw header jjk 02/19/98''' self.version = ord(rawData[0]) self.year = 1900+ord(rawData[1]) self.month = ord(rawData[2]) self.day = ord(rawData[3]) self.recordCount = binnum.unsigned_from_Intel4(rawData[4:8]) self.headerLength = binnum.unsigned_from_Intel2(rawData[8:10]) self.recordLength = binnum.unsigned_from_Intel2(rawData[10:12])
def readFieldDef(self, dbfs, start):
'''read and dcode dbf field definition from binary input stream
jjk 11/05/97'''
self.name = dbfs.read(11)
while (self.name[-1:] == '\000'): self.name = self.name[:-1]
self.type = dbfs.read(1)
dataAddress = binnum.unsigned_from_Intel4(dbfs.read(4))
self.length = ord(dbfs.read(1))
self.start = start
self.end = start + self.length
self.decimalCount = ord(dbfs.read(1))
reserved = dbfs.read(14)
def readFieldDef(self, dbfs, start):
'''read and dcode dbf field definition from binary input stream
jjk 11/05/97'''
self.name = dbfs.read(11)
while (self.name[-1:] == '\000'):
self.name = self.name[:-1]
self.type = dbfs.read(1)
dataAddress = binnum.unsigned_from_Intel4(dbfs.read(4))
self.length = ord(dbfs.read(1))
self.start = start
self.end = start + self.length
self.decimalCount = ord(dbfs.read(1))
reserved = dbfs.read(14)
def readHeaderData(self, dbfs):
'''private: read and dcode dbf header data from binary input stream
jjk 11/05/97'''
self.version = ord(dbfs.read(1))
year = ord(dbfs.read(1))
month = ord(dbfs.read(1))
day = ord(dbfs.read(1))
self.lastUpdate = "%2d/%2d/%2d" % (month, day, year)
self.recordCount = binnum.unsigned_from_Intel4(dbfs.read(4))
self.headerLength = binnum.unsigned_from_Intel2(dbfs.read(2))
self.recordLength = binnum.unsigned_from_Intel2(dbfs.read(2))
reserved = dbfs.read(20)
self.fieldDefs = []
fieldCount = (self.headerLength - 33) / 32
start = 1 #byte 0 is delete flag
for fn in range(fieldCount):
fd = DbfFieldDef()
fd.readFieldDef(dbfs, start)
self.fieldDefs.append(fd)
start = fd.end
skip = dbfs.read(1)
def readHeaderData(self, dbfs):
'''private: read and dcode dbf header data from binary input stream
jjk 11/05/97'''
self.version = ord(dbfs.read(1))
year = ord(dbfs.read(1))
month = ord(dbfs.read(1))
day = ord(dbfs.read(1))
self.lastUpdate = "%2d/%2d/%2d" % (month, day, year)
self.recordCount = binnum.unsigned_from_Intel4(dbfs.read(4))
self.headerLength = binnum.unsigned_from_Intel2(dbfs.read(2))
self.recordLength = binnum.unsigned_from_Intel2(dbfs.read(2))
reserved = dbfs.read(20)
self.fieldDefs = []
fieldCount = (self.headerLength - 33) / 32
start = 1 #byte 0 is delete flag
for fn in range(fieldCount):
fd = DbfFieldDef()
fd.readFieldDef(dbfs, start)
self.fieldDefs.append(fd)
start = fd.end
skip = dbfs.read(1)