def createFields(self):
yield String(self,
"signature",
3,
"SWF format signature",
charset="ASCII")
yield UInt8(self, "version")
yield filesizeHandler(UInt32(self, "filesize"))
if self["signature"].value != "CWS":
yield RECT(self, "rect")
yield FixedFloat16(self, "frame_rate")
yield UInt16(self, "frame_count")
while not self.eof:
yield Tag(self, "tag[]")
else:
size = (self.size - self.current_size) // 8
if has_deflate:
data = Deflate(Bytes(self, "compressed_data", size), False)
def createInputStream(cis, source=None, **args):
stream = cis(source=source)
header = StringInputStream("FWS" +
self.stream.readBytes(3 * 8, 5))
args.setdefault("tags", []).append(("class", SwfFile))
return ConcatStream((header, stream),
source=stream.source,
**args)
data.setSubIStream(createInputStream)
yield data
else:
yield Bytes(self, "compressed_data", size)
def createFields(self):
yield String(self, "signature", 3, "SWF format signature", charset="ASCII")
yield UInt8(self, "version")
yield filesizeHandler(UInt32(self, "filesize"))
if self["signature"].value != "CWS":
yield RECT(self, "rect")
yield FixedFloat16(self, "frame_rate")
yield UInt16(self, "frame_count")
while not self.eof:
yield Tag(self, "tag[]")
else:
size = (self.size - self.current_size) // 8
if has_deflate:
data = Deflate(Bytes(self, "compressed_data", size), False)
def createInputStream(cis, source=None, **args):
stream = cis(source=source)
header = StringInputStream(
"FWS" + self.stream.readBytes(3 * 8, 5))
args.setdefault("tags", []).append(("class", SwfFile))
return ConcatStream((header, stream), source=stream.source, **args)
data.setSubIStream(createInputStream)
yield data
else:
yield Bytes(self, "compressed_data", size)
def data(self, size):
compression = self["compression"].value
if compression == 0:
return SubFile(self, "data", size, filename=self.filename)
compressed = SubFile(self, "compressed_data", size, filename=self.filename)
if compression == COMPRESSION_DEFLATE:
return Deflate(compressed)
else:
return compressed
def createFields(self):
# Gzip header
yield Bytes(self, "signature", 2, r"GZip file signature (\x1F\x8B)")
yield Enum(UInt8(self, "compression", "Compression method"),
self.COMPRESSION_NAME)
# Flags
yield Bit(self, "is_text", "File content is probably ASCII text")
yield Bit(self, "has_crc16", "Header CRC16")
yield Bit(self, "has_extra", "Extra informations (variable size)")
yield Bit(self, "has_filename", "Contains filename?")
yield Bit(self, "has_comment", "Contains comment?")
yield NullBits(self, "reserved[]", 3)
yield TimestampUnix32(self, "mtime", "Modification time")
# Extra flags
yield NullBits(self, "reserved[]", 1)
yield Bit(self, "slowest",
"Compressor used maximum compression (slowest)")
yield Bit(self, "fastest", "Compressor used the fastest compression")
yield NullBits(self, "reserved[]", 5)
yield Enum(UInt8(self, "os", "Operating system"), self.os_name)
# Optional fields
if self["has_extra"].value:
yield UInt16(self, "extra_length", "Extra length")
yield RawBytes(self, "extra", self["extra_length"].value, "Extra")
if self["has_filename"].value:
yield CString(self, "filename", "Filename", charset="ISO-8859-1")
if self["has_comment"].value:
yield CString(self, "comment", "Comment")
if self["has_crc16"].value:
yield textHandler(UInt16(self, "hdr_crc16", "CRC16 of the header"),
hexadecimal)
if self._size is None: # TODO: is it possible to handle piped input?
raise NotImplementedError()
# Read file
size = (self._size - self.current_size) // 8 - 8 # -8: crc32+size
if 0 < size:
if self["has_filename"].value:
filename = self["filename"].value
else:
for tag, filename in self.stream.tags:
if tag == "filename" and filename.endswith(".gz"):
filename = filename[:-3]
break
else:
filename = None
yield Deflate(SubFile(self, "file", size, filename=filename))
# Footer
yield textHandler(
UInt32(self, "crc32", "Uncompressed data content CRC32"),
hexadecimal)
yield filesizeHandler(UInt32(self, "size", "Uncompressed size"))