def __init__(
self,
theFile,
theFileId=None,
keepGoing=False,
hasTif=False,
thePrLen=PhysRec.PR_MAX_LENGTH,
thePrt=PhysRec.PhysRecTail(),
):
"""Constructor with:
theFile - A file like object or string, if the latter it assumed to be a path.
theFileId - File identifier, this could be a path for example. If None the RawStream will try and cope with it.
keepGoing - If True we do our best to keep going.
hasTif - Insert TIF markers or not.
thePrLen - Max Physical Record length, defaults to the maximum possible length.
thePrt - Physical Records Trailer settings (defaults to PhysRec.PhysRecTail()).
"""
super().__init__(theFile, theFileId, 'w', keepGoing)
try:
self._prh = PhysRec.PhysRecWrite(
self.file,
self.fileId,
self.keepGoing,
hasTif,
thePrLen,
thePrt,
)
except PhysRec.ExceptionPhysRec as e:
raise ExceptionFileWrite('FileWrite.__init__(): error "%s"' %
str(e))
def setup(self, arg):
pr_len, lr_len, lr_count = tuple(int(s) for s in arg.split('-'))
self.io_file = io.BytesIO()
pr_writer = PhysRec.PhysRecWrite(
self.io_file,
theFileId='WriteFile',
keepGoing=False,
hasTif=True,
thePrLen=pr_len,
thePrt=PhysRec.PhysRecTail(hasRecNum=True, fileNum=42, hasCheckSum=True),
)
for i in range(lr_count):
pr_writer.writeLr(b'\xff' * lr_len)
def setup(self, arg):
pr_len, lr_len, lr_count = tuple(int(s) for s in arg.split('-'))
io_file = io.BytesIO()
self.pr_writer = PhysRec.PhysRecWrite(
io_file,
theFileId='WriteFile',
keepGoing=False,
hasTif=False,
thePrLen=pr_len,
thePrt=PhysRec.PhysRecTail(
hasRecNum=True,
fileNum=42,
hasCheckSum=False
),
)
self.logical_data = b'\xff' * lr_len
def write_logical_data_to_physical_records(
logical_data_records: typing.List[bytes],
has_tif: bool = False,
pr_len: int = PhysRec.PR_MAX_LENGTH,
pr_tail: PhysRec.PhysRecTail = PhysRec.PhysRecTail()
) -> io.BytesIO:
"""
Takes logical data and writes it into a contiguous set of physical records returning a binary file.
This is quite useful for testing.
pr_tail has the following arguments: hasRecNum=False, fileNum=None, hasCheckSum=False
"""
file_obj = io.BytesIO()
prh = PhysRec.PhysRecWrite(file_obj,
theFileId=None,
keepGoing=False,
hasTif=has_tif,
thePrLen=pr_len,
thePrt=pr_tail)
for ld in logical_data_records:
prh.writeLr(ld)
return file_obj