def createFields(self):
yield String(self, "id", 3, "Identifier (BZh)", charset="ASCII")
yield Character(self, "blocksize",
"Block size (KB of memory needed to uncompress)")
if self._size is None: # TODO: is it possible to handle piped input?
raise NotImplementedError
size = (self._size - self.current_size) / 8
if size:
for tag, filename in self.stream.tags:
if tag == "filename" and filename.endswith(".bz2"):
filename = filename[:-4]
break
else:
filename = None
data = Bzip2Stream(self, "file", size=size * 8)
if has_deflate:
CompressedField(self, Bunzip2)
def createInputStream(**args):
if filename:
args.setdefault("tags", []).append(
("filename", filename))
return self._createInputStream(**args)
data._createInputStream = createInputStream
yield data
def __init__(self, parent, name="compressed_data"):
Fragment.__init__(self, parent, name, None, 8*parent["size"].value)
data = parent.name.split('[')
data, next = "../%s[%%u]" % data[0], int(data[1][:-1]) + 1
first = parent.getField(data % 0)
if first is parent:
first = None
if has_deflate:
CompressedField(self, Gunzip)
else:
first = first[name]
try:
_next = parent[data % next]
next = lambda: _next[name]
except MissingField:
next = None
self.setLinks(first, next)
def createFields(self):
yield String(self, "id", 3, "Identifier (BZh)", charset="ASCII")
yield Character(self, "blocksize",
"Block size (KB of memory needed to uncompress)")
yield UInt8(self, "blockheader", "Block header")
if self["blockheader"].value == 0x17:
yield String(self, "id2", 4, "Identifier2 (re8P)", charset="ASCII")
yield UInt8(self, "id3", "Identifier3 (0x90)")
elif self["blockheader"].value == 0x31:
yield String(self,
"id2",
5,
"Identifier 2 (AY&SY)",
charset="ASCII")
if self["id2"].value != "AY&SY":
raise ParserError("Invalid identifier 2 (AY&SY)!")
else:
raise ParserError("Invalid block header!")
yield textHandler(UInt32(self, "crc32", "CRC32"), hexadecimal)
if self._size is None: # TODO: is it possible to handle piped input?
raise NotImplementedError
size = (self._size - self.current_size) / 8
if size:
for tag, filename in self.stream.tags:
if tag == "filename" and filename.endswith(".bz2"):
filename = filename[:-4]
break
else:
filename = None
data = Bytes(self, "file", size)
if has_deflate:
CompressedField(self, Bunzip2)
def createInputStream(**args):
if filename:
args.setdefault("tags", []).append(
("filename", filename))
return self._createInputStream(**args)
data._createInputStream = createInputStream
yield data
def Deflate(field, wbits=True):
if wbits:
CompressedField(field, DeflateStreamWbits)
else:
CompressedField(field, DeflateStream)
return field
def Deflate(field):
CompressedField(field, DeflateStream)
return field