def __init__(self, ffd):
self._fd = ffd
self._header = Header()
self._body = Body()
self._crc = Crc()
self.file_size = fstat(self._fd.fileno()).st_size
self.header_chunk = ""
class Header(object):
def __init__(self):
self._format = Struct("<BBHL4s")
self.size = None
self.data_type = ".FIT"
self.data_size = None
self.crc = Crc()
self.protocol_version = 16
self.profile_version = 1005
def __nonzero__(self):
return self.size is not None
def __repr__(self):
return '<%s protocol=%d profile=%d crc=%r>' % (
self.__class__.__name__,
self.protocol_version,
self.profile_version,
self.crc
)
@property
def total_size(self):
return self.size + self.data_size + self.crc.size
@property
def valid(self):
return self.data_type == ".FIT"
def read(self, chunk):
(
self.size, self.protocol_version, self.profile_version,
self.data_size, self.data_type
) = self._format.unpack(chunk[:12])
if len(chunk) == 14:
self.crc.read(chunk[12:])
if self.crc.value and not self.crc.check(chunk[:12]):
raise BodyFormatError("Invalid CRC %x, should be %x" % (
compute_crc(chunk[:12]), self.crc.value))
def write(self):
self.size = 14
chunk = self._format.pack(self.size, self.protocol_version,
self.profile_version, self.data_size,
self.data_type)
self.crc.value = compute_crc(chunk)
return chunk + self.crc.write()
def __init__(self):
self._format = Struct("<BBHL4s")
self.size = None
self.data_type = ".FIT"
self.data_size = None
self.crc = Crc()
self.protocol_version = 16
self.profile_version = 1005
class Header(object):
def __init__(self):
self._format = Struct("<BBHL4s")
self.size = None
self.data_type = ".FIT"
self.data_size = None
self.crc = Crc()
self.protocol_version = 16
self.profile_version = 1005
def __nonzero__(self):
return self.size is not None
def __repr__(self):
return '<%s protocol=%d profile=%d crc=%r>' % (
self.__class__.__name__, self.protocol_version,
self.profile_version, self.crc)
@property
def total_size(self):
return self.size + self.data_size + self.crc.size
@property
def valid(self):
return self.data_type == ".FIT"
def read(self, chunk):
(self.size, self.protocol_version, self.profile_version,
self.data_size, self.data_type) = self._format.unpack(chunk[:12])
if len(chunk) == 14:
self.crc.read(chunk[12:])
if self.crc.value and not self.crc.check(chunk[:12]):
raise BodyFormatError(
"Invalid CRC %x, should be %x" %
(compute_crc(chunk[:12]), self.crc.value))
def write(self):
self.size = 14
chunk = self._format.pack(self.size, self.protocol_version,
self.profile_version, self.data_size,
self.data_type)
self.crc.value = compute_crc(chunk)
return chunk + self.crc.write()
def __init__(self, ffd):
self._fd = ffd
self._header = Header()
self._body = Body()
self._crc = Crc()
try:
self.file_size = fstat(self._fd.fileno()).st_size
except UnsupportedOperation:
self._fd.seek(0, SEEK_END)
self.file_size = self._fd.tell()
self._fd.seek(0)
self.header_chunk = ""
class Writer(object):
def __init__(self, ffd, body=None):
self._fd = ffd
self.header = Header()
self.body = body or Body()
self.crc = Crc()
def __repr__(self):
if not self.header or self.crc:
self._prepare()
return '<%s header=%r body=%r crc=%r>' % (
self.__class__.__name__,
self.header, self.body, self.crc
)
def _prepare(self):
chunk = self.body.write()
self.header.data_size = len(chunk)
self.crc.value = compute_crc(chunk)
return chunk
def write(self):
chunk = self._prepare()
self._fd.seek(0)
self._fd.truncate()
self._fd.write(self.header.write())
self._fd.write(chunk)
self._fd.write(self.crc.write())
class Writer(object):
def __init__(self, ffd, body=None):
self._fd = ffd
self.header = Header()
self.body = body or Body()
self.crc = Crc()
def __repr__(self):
if not self.header or self.crc:
self._prepare()
return '<%s header=%r body=%r crc=%r>' % (
self.__class__.__name__, self.header, self.body, self.crc)
def _prepare(self):
chunk = self.body.write()
self.header.data_size = len(chunk)
self.crc.value = compute_crc(chunk)
return chunk
def write(self):
chunk = self._prepare()
self._fd.seek(0)
self._fd.truncate()
self._fd.write(self.header.write())
self._fd.write(chunk)
self._fd.write(self.crc.write())
def __init__(self):
self._format = Struct("<BBHL4s")
self.size = None
self.data_type = ".FIT"
self.data_size = None
self.crc = Crc()
self.protocol_version = 16
self.profile_version = 1005
def __init__(self, ffd):
self._fd = ffd
self._header = Header()
self._body = Body()
self._crc = Crc()
try:
self.file_size = fstat(self._fd.fileno()).st_size
except UnsupportedOperation:
self._fd.seek(0, SEEK_END)
self.file_size = self._fd.tell()
self._fd.seek(0)
self.header_chunk = ""
class Reader(object):
def __init__(self, ffd):
self._fd = ffd
self._header = Header()
self._body = Body()
self._crc = Crc()
try:
self.file_size = fstat(self._fd.fileno()).st_size
except UnsupportedOperation:
self._fd.seek(0, SEEK_END)
self.file_size = self._fd.tell()
self._fd.seek(0)
self.header_chunk = ""
def __repr__(self):
return '<%s header=%r body=%r crc=%r>' % (
self.__class__.__name__,
self.header, self.body, self.crc
)
@property
def header(self):
if self._header:
return self._header
self._fd.seek(0)
header_size = ord(self._fd.read(1))
if header_size not in (12, 14):
raise HeaderFormatError(
"Strange size: %d bytes" % header_size)
header = self._fd.read(header_size - 1)
if len(header) != header_size - 1:
raise HeaderFormatError(
"Can't read %d bytes, read %d bytes instead" % (
header_size, len(header) + 1))
self.header_chunk = header = "%c%s" % (header_size, header)
self._header.read(header)
if not self._header.valid:
raise HeaderFormatError("Not FIT filetype")
if self._header.total_size != self.file_size:
raise HeaderFormatError(
"File size should be %d bytes, but actually is %d bytes" % (
self._header.total_size, self.file_size))
return self._header
@property
def body(self):
if not self._body:
self._fd.seek(self.header.size)
body = self._fd.read(self.header.data_size)
if len(body) != self.header.data_size:
raise BodyFormatError(
"Can't read %d bytes, read %d bytes instead" % (
self.header.data_size, len(body)))
header = "" if self.header.crc.value else self.header_chunk
if not self.crc.check(header + body):
raise BodyFormatError("Invalid CRC %x, should be %x" % (
compute_crc(body), self.crc.value))
self._body.read(body)
return self._body
@property
def crc(self):
if not self._crc:
self._fd.seek(self.header.size + self.header.data_size)
chunk = self._fd.read(self._crc.size)
if len(chunk) != self._crc.size:
raise CrcFormatError(
"Can't read %d bytes, read %d bytes instead" % (
self.header.data_size, len(chunk)))
self._crc.read(chunk)
return self._crc
def __init__(self, ffd, body=None):
self._fd = ffd
self.header = Header()
self.body = body or Body()
self.crc = Crc()
class Reader(object):
def __init__(self, ffd):
self._fd = ffd
self._header = Header()
self._body = Body()
self._crc = Crc()
self.file_size = fstat(self._fd.fileno()).st_size
self.header_chunk = ""
def __repr__(self):
return '<%s header=%r body=%r crc=%r>' % (
self.__class__.__name__, self.header, self.body, self.crc)
@property
def header(self):
if self._header:
return self._header
self._fd.seek(0)
header_size = ord(self._fd.read(1))
if header_size not in (12, 14):
raise HeaderFormatError("Strange size: %d bytes" % header_size)
header = self._fd.read(header_size - 1)
if len(header) != header_size - 1:
raise HeaderFormatError(
"Can't read %d bytes, read %d bytes instead" %
(header_size, len(header) + 1))
self.header_chunk = header = "%c%s" % (header_size, header)
self._header.read(header)
if not self._header.valid:
raise HeaderFormatError("Not FIT filetype")
if self._header.total_size != self.file_size:
raise HeaderFormatError(
"File size should be %d bytes, but actually is %d bytes" %
(self._header.total_size, self.file_size))
return self._header
@property
def body(self):
if not self._body:
self._fd.seek(self.header.size)
body = self._fd.read(self.header.data_size)
if len(body) != self.header.data_size:
raise BodyFormatError(
"Can't read %d bytes, read %d bytes instead" %
(self.header.data_size, len(body)))
header = "" if self.header.crc.value else self.header_chunk
if not self.crc.check(header + body):
raise BodyFormatError("Invalid CRC %x, should be %x" %
(compute_crc(body), self.crc.value))
self._body.read(body)
return self._body
@property
def crc(self):
if not self._crc:
self._fd.seek(self.header.size + self.header.data_size)
chunk = self._fd.read(self._crc.size)
if len(chunk) != self._crc.size:
raise CrcFormatError(
"Can't read %d bytes, read %d bytes instead" %
(self.header.data_size, len(chunk)))
self._crc.read(chunk)
return self._crc
def __init__(self, ffd, body=None):
self._fd = ffd
self.header = Header()
self.body = body or Body()
self.crc = Crc()
