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Python Compiled Bytecode | 2005-10-18 | 36.9 KB | 1,404 lines

# Source Generated with Decompyle++ # File: in.pyo (Python 2.4) '''Create portable serialized representations of Python objects. See module cPickle for a (much) faster implementation. See module copy_reg for a mechanism for registering custom picklers. See module pickletools source for extensive comments. Classes: Pickler Unpickler Functions: dump(object, file) dumps(object) -> string load(file) -> object loads(string) -> object Misc variables: __version__ format_version compatible_formats ''' __version__ = '$Revision: 1.158 $' from types import * from copy_reg import dispatch_table from copy_reg import _extension_registry, _inverted_registry, _extension_cache import marshal import sys import struct import re import warnings __all__ = [ 'PickleError', 'PicklingError', 'UnpicklingError', 'Pickler', 'Unpickler', 'dump', 'dumps', 'load', 'loads'] format_version = '2.0' compatible_formats = [ '1.0', '1.1', '1.2', '1.3', '2.0'] HIGHEST_PROTOCOL = 2 mloads = marshal.loads class PickleError(Exception): '''A common base class for the other pickling exceptions.''' pass class PicklingError(PickleError): '''This exception is raised when an unpicklable object is passed to the dump() method. ''' pass class UnpicklingError(PickleError): '''This exception is raised when there is a problem unpickling an object, such as a security violation. Note that other exceptions may also be raised during unpickling, including (but not necessarily limited to) AttributeError, EOFError, ImportError, and IndexError. ''' pass class _Stop(Exception): def __init__(self, value): self.value = value try: from org.python.core import PyStringMap except ImportError: PyStringMap = None try: UnicodeType except NameError: UnicodeType = None MARK = '(' STOP = '.' POP = '0' POP_MARK = '1' DUP = '2' FLOAT = 'F' INT = 'I' BININT = 'J' BININT1 = 'K' LONG = 'L' BININT2 = 'M' NONE = 'N' PERSID = 'P' BINPERSID = 'Q' REDUCE = 'R' STRING = 'S' BINSTRING = 'T' SHORT_BINSTRING = 'U' UNICODE = 'V' BINUNICODE = 'X' APPEND = 'a' BUILD = 'b' GLOBAL = 'c' DICT = 'd' EMPTY_DICT = '}' APPENDS = 'e' GET = 'g' BINGET = 'h' INST = 'i' LONG_BINGET = 'j' LIST = 'l' EMPTY_LIST = ']' OBJ = 'o' PUT = 'p' BINPUT = 'q' LONG_BINPUT = 'r' SETITEM = 's' TUPLE = 't' EMPTY_TUPLE = ')' SETITEMS = 'u' BINFLOAT = 'G' TRUE = 'I01\n' FALSE = 'I00\n' PROTO = '\x80' NEWOBJ = '\x81' EXT1 = '\x82' EXT2 = '\x83' EXT4 = '\x84' TUPLE1 = '\x85' TUPLE2 = '\x86' TUPLE3 = '\x87' NEWTRUE = '\x88' NEWFALSE = '\x89' LONG1 = '\x8a' LONG4 = '\x8b' _tuplesize2code = [ EMPTY_TUPLE, TUPLE1, TUPLE2, TUPLE3] []([] if re.match('[A-Z][A-Z0-9_]+$', x) else _[1]) del x class Pickler: def __init__(self, file, protocol = None, bin = None): '''This takes a file-like object for writing a pickle data stream. The optional protocol argument tells the pickler to use the given protocol; supported protocols are 0, 1, 2. The default protocol is 0, to be backwards compatible. (Protocol 0 is the only protocol that can be written to a file opened in text mode and read back successfully. When using a protocol higher than 0, make sure the file is opened in binary mode, both when pickling and unpickling.) Protocol 1 is more efficient than protocol 0; protocol 2 is more efficient than protocol 1. Specifying a negative protocol version selects the highest protocol version supported. The higher the protocol used, the more recent the version of Python needed to read the pickle produced. The file parameter must have a write() method that accepts a single string argument. It can thus be an open file object, a StringIO object, or any other custom object that meets this interface. ''' if protocol is not None and bin is not None: raise ValueError, "can't specify both 'protocol' and 'bin'" if bin is not None: warnings.warn("The 'bin' argument to Pickler() is deprecated", DeprecationWarning) protocol = bin if protocol is None: protocol = 0 if protocol < 0: protocol = HIGHEST_PROTOCOL elif protocol <= protocol: pass elif not protocol <= HIGHEST_PROTOCOL: raise ValueError('pickle protocol must be <= %d' % HIGHEST_PROTOCOL) self.write = file.write self.memo = { } self.proto = int(protocol) self.bin = protocol >= 1 self.fast = 0 def clear_memo(self): '''Clears the pickler\'s "memo". The memo is the data structure that remembers which objects the pickler has already seen, so that shared or recursive objects are pickled by reference and not by value. This method is useful when re-using picklers. ''' self.memo.clear() def dump(self, obj): '''Write a pickled representation of obj to the open file.''' if self.proto >= 2: self.write(PROTO + chr(self.proto)) self.save(obj) self.write(STOP) def memoize(self, obj): '''Store an object in the memo.''' if self.fast: return None memo_len = len(self.memo) self.write(self.put(memo_len)) self.memo[id(obj)] = (memo_len, obj) def put(self, i, pack = struct.pack): if self.bin: if i < 256: return BINPUT + chr(i) else: return LONG_BINPUT + pack('<i', i) return PUT + repr(i) + '\n' def get(self, i, pack = struct.pack): if self.bin: if i < 256: return BINGET + chr(i) else: return LONG_BINGET + pack('<i', i) return GET + repr(i) + '\n' def save(self, obj): pid = self.persistent_id(obj) if pid: self.save_pers(pid) return None x = self.memo.get(id(obj)) if x: self.write(self.get(x[0])) return None t = type(obj) f = self.dispatch.get(t) if f: f(self, obj) return None try: issc = issubclass(t, TypeType) except TypeError: issc = 0 if issc: self.save_global(obj) return None reduce = dispatch_table.get(t) if reduce: rv = reduce(obj) else: reduce = getattr(obj, '__reduce_ex__', None) if reduce: rv = reduce(self.proto) else: reduce = getattr(obj, '__reduce__', None) if reduce: rv = reduce() else: raise PicklingError("Can't pickle %r object: %r" % (t.__name__, obj)) if type(rv) is StringType: self.save_global(obj, rv) return None if type(rv) is not TupleType: raise PicklingError('%s must return string or tuple' % reduce) l = len(rv) if l <= l: pass elif not l <= 5: raise PicklingError('Tuple returned by %s must have two to five elements' % reduce) self.save_reduce(obj = obj, *rv) def persistent_id(self, obj): pass def save_pers(self, pid): if self.bin: self.save(pid) self.write(BINPERSID) else: self.write(PERSID + str(pid) + '\n') def save_reduce(self, func, args, state = None, listitems = None, dictitems = None, obj = None): if not isinstance(args, TupleType): if args is None: warnings.warn('__basicnew__ special case is deprecated', DeprecationWarning) else: raise PicklingError('args from reduce() should be a tuple') if not callable(func): raise PicklingError('func from reduce should be callable') save = self.save write = self.write if self.proto >= 2 and getattr(func, '__name__', '') == '__newobj__': cls = args[0] if not hasattr(cls, '__new__'): raise PicklingError('args[0] from __newobj__ args has no __new__') if obj is not None and cls is not obj.__class__: raise PicklingError('args[0] from __newobj__ args has the wrong class') args = args[1:] save(cls) save(args) write(NEWOBJ) else: save(func) save(args) write(REDUCE) if obj is not None: self.memoize(obj) if listitems is not None: self._batch_appends(listitems) if dictitems is not None: self._batch_setitems(dictitems) if state is not None: save(state) write(BUILD) dispatch = { } def save_none(self, obj): self.write(NONE) dispatch[NoneType] = save_none def save_bool(self, obj): if self.proto >= 2: if not obj or NEWTRUE: pass self.write(NEWFALSE) elif not obj or TRUE: pass self.write(FALSE) dispatch[bool] = save_bool def save_int(self, obj, pack = struct.pack): if self.bin: if obj >= 0: if obj <= 255: self.write(BININT1 + chr(obj)) return None if obj <= 65535: self.write('%c%c%c' % (BININT2, obj & 255, obj >> 8)) return None high_bits = obj >> 31 if high_bits == 0 or high_bits == -1: self.write(BININT + pack('<i', obj)) return None self.write(INT + repr(obj) + '\n') dispatch[IntType] = save_int def save_long(self, obj, pack = struct.pack): if self.proto >= 2: bytes = encode_long(obj) n = len(bytes) if n < 256: self.write(LONG1 + chr(n) + bytes) else: self.write(LONG4 + pack('<i', n) + bytes) return None self.write(LONG + repr(obj) + '\n') dispatch[LongType] = save_long def save_float(self, obj, pack = struct.pack): if self.bin: self.write(BINFLOAT + pack('>d', obj)) else: self.write(FLOAT + repr(obj) + '\n') dispatch[FloatType] = save_float def save_string(self, obj, pack = struct.pack): if self.bin: n = len(obj) if n < 256: self.write(SHORT_BINSTRING + chr(n) + obj) else: self.write(BINSTRING + pack('<i', n) + obj) else: self.write(STRING + repr(obj) + '\n') self.memoize(obj) dispatch[StringType] = save_string def save_unicode(self, obj, pack = struct.pack): if self.bin: encoding = obj.encode('utf-8') n = len(encoding) self.write(BINUNICODE + pack('<i', n) + encoding) else: obj = obj.replace('\\', '\\u005c') obj = obj.replace('\n', '\\u000a') self.write(UNICODE + obj.encode('raw-unicode-escape') + '\n') self.memoize(obj) dispatch[UnicodeType] = save_unicode if StringType == UnicodeType: def save_string(self, obj, pack = struct.pack): unicode = obj.isunicode() if self.bin: if unicode: obj = obj.encode('utf-8') l = len(obj) if l < 256 and not unicode: self.write(SHORT_BINSTRING + chr(l) + obj) else: s = pack('<i', l) if unicode: self.write(BINUNICODE + s + obj) else: self.write(BINSTRING + s + obj) elif unicode: obj = obj.replace('\\', '\\u005c') obj = obj.replace('\n', '\\u000a') obj = obj.encode('raw-unicode-escape') self.write(UNICODE + obj + '\n') else: self.write(STRING + repr(obj) + '\n') self.memoize(obj) dispatch[StringType] = save_string def save_tuple(self, obj): write = self.write proto = self.proto n = len(obj) if n == 0: if proto: write(EMPTY_TUPLE) else: write(MARK + TUPLE) return None save = self.save memo = self.memo if n <= 3 and proto >= 2: for element in obj: save(element) if id(obj) in memo: get = self.get(memo[id(obj)][0]) write(POP * n + get) else: write(_tuplesize2code[n]) self.memoize(obj) return None write(MARK) for element in obj: save(element) if id(obj) in memo: get = self.get(memo[id(obj)][0]) if proto: write(POP_MARK + get) else: write(POP * (n + 1) + get) return None self.write(TUPLE) self.memoize(obj) dispatch[TupleType] = save_tuple def save_empty_tuple(self, obj): self.write(EMPTY_TUPLE) def save_list(self, obj): write = self.write if self.bin: write(EMPTY_LIST) else: write(MARK + LIST) self.memoize(obj) self._batch_appends(iter(obj)) dispatch[ListType] = save_list _BATCHSIZE = 1000 def _batch_appends(self, items): save = self.save write = self.write if not self.bin: for x in items: save(x) write(APPEND) return None r = xrange(self._BATCHSIZE) while items is not None: tmp = [] for i in r: try: x = items.next() tmp.append(x) continue except StopIteration: items = None break continue n = len(tmp) if n > 1: write(MARK) for x in tmp: save(x) write(APPENDS) continue None<EXCEPTION MATCH>StopIteration if n: save(tmp[0]) write(APPEND) continue def save_dict(self, obj): write = self.write if self.bin: write(EMPTY_DICT) else: write(MARK + DICT) self.memoize(obj) self._batch_setitems(obj.iteritems()) dispatch[DictionaryType] = save_dict if PyStringMap is not None: dispatch[PyStringMap] = save_dict def _batch_setitems(self, items): save = self.save write = self.write if not self.bin: for k, v in items: save(k) save(v) write(SETITEM) return None r = xrange(self._BATCHSIZE) while items is not None: tmp = [] for i in r: try: tmp.append(items.next()) continue except StopIteration: items = None break continue n = len(tmp) if n > 1: write(MARK) for k, v in tmp: save(k) save(v) write(SETITEMS) continue None<EXCEPTION MATCH>StopIteration if n: (k, v) = tmp[0] save(k) save(v) write(SETITEM) continue def save_inst(self, obj): cls = obj.__class__ memo = self.memo write = self.write save = self.save if hasattr(obj, '__getinitargs__'): args = obj.__getinitargs__() len(args) _keep_alive(args, memo) else: args = () write(MARK) if self.bin: save(cls) for arg in args: save(arg) write(OBJ) else: for arg in args: save(arg) write(INST + cls.__module__ + '\n' + cls.__name__ + '\n') self.memoize(obj) try: getstate = obj.__getstate__ except AttributeError: stuff = obj.__dict__ stuff = getstate() _keep_alive(stuff, memo) save(stuff) write(BUILD) dispatch[InstanceType] = save_inst def save_global(self, obj, name = None, pack = struct.pack): write = self.write memo = self.memo if name is None: name = obj.__name__ module = getattr(obj, '__module__', None) if module is None: module = whichmodule(obj, name) try: __import__(module) mod = sys.modules[module] klass = getattr(mod, name) except (ImportError, KeyError, AttributeError): raise PicklingError("Can't pickle %r: it's not found as %s.%s" % (obj, module, name)) if klass is not obj: raise PicklingError("Can't pickle %r: it's not the same object as %s.%s" % (obj, module, name)) if self.proto >= 2: code = _extension_registry.get((module, name)) if code: if code <= 255: write(EXT1 + chr(code)) elif code <= 65535: write('%c%c%c' % (EXT2, code & 255, code >> 8)) else: write(EXT4 + pack('<i', code)) return None write(GLOBAL + module + '\n' + name + '\n') self.memoize(obj) dispatch[ClassType] = save_global dispatch[FunctionType] = save_global dispatch[BuiltinFunctionType] = save_global dispatch[TypeType] = save_global def _keep_alive(x, memo): '''Keeps a reference to the object x in the memo. Because we remember objects by their id, we have to assure that possibly temporary objects are kept alive by referencing them. We store a reference at the id of the memo, which should normally not be used unless someone tries to deepcopy the memo itself... ''' try: memo[id(memo)].append(x) except KeyError: memo[id(memo)] = [ x] classmap = { } def whichmodule(func, funcname): '''Figure out the module in which a function occurs. Search sys.modules for the module. Cache in classmap. Return a module name. If the function cannot be found, return "__main__". ''' mod = getattr(func, '__module__', None) if mod is not None: return mod if func in classmap: return classmap[func] for name, module in sys.modules.items(): if module is None: continue if name != '__main__' and getattr(module, funcname, None) is func: break continue else: name = '__main__' classmap[func] = name return name class Unpickler: def __init__(self, file): '''This takes a file-like object for reading a pickle data stream. The protocol version of the pickle is detected automatically, so no proto argument is needed. The file-like object must have two methods, a read() method that takes an integer argument, and a readline() method that requires no arguments. Both methods should return a string. Thus file-like object can be a file object opened for reading, a StringIO object, or any other custom object that meets this interface. ''' self.readline = file.readline self.read = file.read self.memo = { } def load(self): '''Read a pickled object representation from the open file. Return the reconstituted object hierarchy specified in the file. ''' self.mark = object() self.stack = [] self.append = self.stack.append read = self.read dispatch = self.dispatch try: while None: key = read(1) except _Stop: stopinst = None return stopinst.value def marker(self): stack = self.stack mark = self.mark k = len(stack) - 1 while stack[k] is not mark: k = k - 1 return k dispatch = { } def load_eof(self): raise EOFError dispatch[''] = load_eof def load_proto(self): proto = ord(self.read(1)) if proto <= proto: pass elif not proto <= 2: raise ValueError, 'unsupported pickle protocol: %d' % proto dispatch[PROTO] = load_proto def load_persid(self): pid = self.readline()[:-1] self.append(self.persistent_load(pid)) dispatch[PERSID] = load_persid def load_binpersid(self): pid = self.stack.pop() self.append(self.persistent_load(pid)) dispatch[BINPERSID] = load_binpersid def load_none(self): self.append(None) dispatch[NONE] = load_none def load_false(self): self.append(False) dispatch[NEWFALSE] = load_false def load_true(self): self.append(True) dispatch[NEWTRUE] = load_true def load_int(self): data = self.readline() if data == FALSE[1:]: val = False elif data == TRUE[1:]: val = True else: try: val = int(data) except ValueError: val = long(data) self.append(val) dispatch[INT] = load_int def load_binint(self): self.append(mloads('i' + self.read(4))) dispatch[BININT] = load_binint def load_binint1(self): self.append(ord(self.read(1))) dispatch[BININT1] = load_binint1 def load_binint2(self): self.append(mloads('i' + self.read(2) + '\x00\x00')) dispatch[BININT2] = load_binint2 def load_long(self): self.append(long(self.readline()[:-1], 0)) dispatch[LONG] = load_long def load_long1(self): n = ord(self.read(1)) bytes = self.read(n) self.append(decode_long(bytes)) dispatch[LONG1] = load_long1 def load_long4(self): n = mloads('i' + self.read(4)) bytes = self.read(n) self.append(decode_long(bytes)) dispatch[LONG4] = load_long4 def load_float(self): self.append(float(self.readline()[:-1])) dispatch[FLOAT] = load_float def load_binfloat(self, unpack = struct.unpack): self.append(unpack('>d', self.read(8))[0]) dispatch[BINFLOAT] = load_binfloat def load_string(self): rep = self.readline()[:-1] for q in '"\'': if rep.startswith(q): if not rep.endswith(q): raise ValueError, 'insecure string pickle' rep = rep[len(q):-len(q)] break continue else: raise ValueError, 'insecure string pickle' self.append(rep.decode('string-escape')) dispatch[STRING] = load_string def load_binstring(self): len = mloads('i' + self.read(4)) self.append(self.read(len)) dispatch[BINSTRING] = load_binstring def load_unicode(self): self.append(unicode(self.readline()[:-1], 'raw-unicode-escape')) dispatch[UNICODE] = load_unicode def load_binunicode(self): len = mloads('i' + self.read(4)) self.append(unicode(self.read(len), 'utf-8')) dispatch[BINUNICODE] = load_binunicode def load_short_binstring(self): len = ord(self.read(1)) self.append(self.read(len)) dispatch[SHORT_BINSTRING] = load_short_binstring def load_tuple(self): k = self.marker() self.stack[k:] = [ tuple(self.stack[k + 1:])] dispatch[TUPLE] = load_tuple def load_empty_tuple(self): self.stack.append(()) dispatch[EMPTY_TUPLE] = load_empty_tuple def load_tuple1(self): self.stack[-1] = (self.stack[-1],) dispatch[TUPLE1] = load_tuple1 def load_tuple2(self): self.stack[-2:] = [ (self.stack[-2], self.stack[-1])] dispatch[TUPLE2] = load_tuple2 def load_tuple3(self): self.stack[-3:] = [ (self.stack[-3], self.stack[-2], self.stack[-1])] dispatch[TUPLE3] = load_tuple3 def load_empty_list(self): self.stack.append([]) dispatch[EMPTY_LIST] = load_empty_list def load_empty_dictionary(self): self.stack.append({ }) dispatch[EMPTY_DICT] = load_empty_dictionary def load_list(self): k = self.marker() self.stack[k:] = [ self.stack[k + 1:]] dispatch[LIST] = load_list def load_dict(self): k = self.marker() d = { } items = self.stack[k + 1:] for i in range(0, len(items), 2): key = items[i] value = items[i + 1] d[key] = value self.stack[k:] = [ d] dispatch[DICT] = load_dict def _instantiate(self, klass, k): args = tuple(self.stack[k + 1:]) del self.stack[k:] instantiated = 0 if not args and type(klass) is ClassType and not hasattr(klass, '__getinitargs__'): try: value = _EmptyClass() value.__class__ = klass instantiated = 1 except RuntimeError: pass except: None<EXCEPTION MATCH>RuntimeError None<EXCEPTION MATCH>RuntimeError if not instantiated: try: value = klass(*args) except TypeError: err = None raise TypeError, 'in constructor for %s: %s' % (klass.__name__, str(err)), sys.exc_info()[2] except: None<EXCEPTION MATCH>TypeError None<EXCEPTION MATCH>TypeError self.append(value) def load_inst(self): module = self.readline()[:-1] name = self.readline()[:-1] klass = self.find_class(module, name) self._instantiate(klass, self.marker()) dispatch[INST] = load_inst def load_obj(self): k = self.marker() klass = self.stack.pop(k + 1) self._instantiate(klass, k) dispatch[OBJ] = load_obj def load_newobj(self): args = self.stack.pop() cls = self.stack[-1] obj = cls.__new__(cls, *args) self.stack[-1] = obj dispatch[NEWOBJ] = load_newobj def load_global(self): module = self.readline()[:-1] name = self.readline()[:-1] klass = self.find_class(module, name) self.append(klass) dispatch[GLOBAL] = load_global def load_ext1(self): code = ord(self.read(1)) self.get_extension(code) dispatch[EXT1] = load_ext1 def load_ext2(self): code = mloads('i' + self.read(2) + '\x00\x00') self.get_extension(code) dispatch[EXT2] = load_ext2 def load_ext4(self): code = mloads('i' + self.read(4)) self.get_extension(code) dispatch[EXT4] = load_ext4 def get_extension(self, code): nil = [] obj = _extension_cache.get(code, nil) if obj is not nil: self.append(obj) return None key = _inverted_registry.get(code) if not key: raise ValueError('unregistered extension code %d' % code) obj = self.find_class(*key) _extension_cache[code] = obj self.append(obj) def find_class(self, module, name): __import__(module) mod = sys.modules[module] klass = getattr(mod, name) return klass def load_reduce(self): stack = self.stack args = stack.pop() func = stack[-1] if args is None: warnings.warn('__basicnew__ special case is deprecated', DeprecationWarning) value = func.__basicnew__() else: value = func(*args) stack[-1] = value dispatch[REDUCE] = load_reduce def load_pop(self): del self.stack[-1] dispatch[POP] = load_pop def load_pop_mark(self): k = self.marker() del self.stack[k:] dispatch[POP_MARK] = load_pop_mark def load_dup(self): self.append(self.stack[-1]) dispatch[DUP] = load_dup def load_get(self): self.append(self.memo[self.readline()[:-1]]) dispatch[GET] = load_get def load_binget(self): i = ord(self.read(1)) self.append(self.memo[repr(i)]) dispatch[BINGET] = load_binget def load_long_binget(self): i = mloads('i' + self.read(4)) self.append(self.memo[repr(i)]) dispatch[LONG_BINGET] = load_long_binget def load_put(self): self.memo[self.readline()[:-1]] = self.stack[-1] dispatch[PUT] = load_put def load_binput(self): i = ord(self.read(1)) self.memo[repr(i)] = self.stack[-1] dispatch[BINPUT] = load_binput def load_long_binput(self): i = mloads('i' + self.read(4)) self.memo[repr(i)] = self.stack[-1] dispatch[LONG_BINPUT] = load_long_binput def load_append(self): stack = self.stack value = stack.pop() list = stack[-1] list.append(value) dispatch[APPEND] = load_append def load_appends(self): stack = self.stack mark = self.marker() list = stack[mark - 1] list.extend(stack[mark + 1:]) del stack[mark:] dispatch[APPENDS] = load_appends def load_setitem(self): stack = self.stack value = stack.pop() key = stack.pop() dict = stack[-1] dict[key] = value dispatch[SETITEM] = load_setitem def load_setitems(self): stack = self.stack mark = self.marker() dict = stack[mark - 1] for i in range(mark + 1, len(stack), 2): dict[stack[i]] = stack[i + 1] del stack[mark:] dispatch[SETITEMS] = load_setitems def load_build(self): stack = self.stack state = stack.pop() inst = stack[-1] setstate = getattr(inst, '__setstate__', None) if setstate: setstate(state) return None slotstate = None if isinstance(state, tuple) and len(state) == 2: (state, slotstate) = state if state: try: inst.__dict__.update(state) except RuntimeError: for k, v in state.items(): setattr(inst, k, v) None<EXCEPTION MATCH>RuntimeError if slotstate: for k, v in slotstate.items(): setattr(inst, k, v) dispatch[BUILD] = load_build def load_mark(self): self.append(self.mark) dispatch[MARK] = load_mark def load_stop(self): value = self.stack.pop() raise _Stop(value) dispatch[STOP] = load_stop class _EmptyClass: pass import binascii as _binascii def encode_long(x): """Encode a long to a two's complement little-endian binary string. Note that 0L is a special case, returning an empty string, to save a byte in the LONG1 pickling context. >>> encode_long(0L) '' >>> encode_long(255L) '\\xff\\x00' >>> encode_long(32767L) '\\xff\\x7f' >>> encode_long(-256L) '\\x00\\xff' >>> encode_long(-32768L) '\\x00\\x80' >>> encode_long(-128L) '\\x80' >>> encode_long(127L) '\\x7f' >>> """ if x == 0: return '' if x > 0: ashex = hex(x) njunkchars = 2 + ashex.endswith('L') nibbles = len(ashex) - njunkchars if nibbles & 1: ashex = '0x0' + ashex[2:] elif int(ashex[2], 16) >= 8: ashex = '0x00' + ashex[2:] else: ashex = hex(-x) njunkchars = 2 + ashex.endswith('L') nibbles = len(ashex) - njunkchars if nibbles & 1: nibbles += 1 nbits = nibbles * 4 x += 0x1L << nbits ashex = hex(x) njunkchars = 2 + ashex.endswith('L') newnibbles = len(ashex) - njunkchars if newnibbles < nibbles: ashex = '0x' + '0' * (nibbles - newnibbles) + ashex[2:] if int(ashex[2], 16) < 8: ashex = '0xff' + ashex[2:] if ashex.endswith('L'): ashex = ashex[2:-1] else: ashex = ashex[2:] binary = _binascii.unhexlify(ashex) return binary[::-1] def decode_long(data): '''Decode a long from a two\'s complement little-endian binary string. >>> decode_long(\'\') 0L >>> decode_long("\\xff\\x00") 255L >>> decode_long("\\xff\\x7f") 32767L >>> decode_long("\\x00\\xff") -256L >>> decode_long("\\x00\\x80") -32768L >>> decode_long("\\x80") -128L >>> decode_long("\\x7f") 127L ''' nbytes = len(data) if nbytes == 0: return 0x0L ashex = _binascii.hexlify(data[::-1]) n = long(ashex, 16) if data[-1] >= '\x80': n -= 0x1L << nbytes * 8 return n try: from cStringIO import StringIO except ImportError: __all__.extend __all__.extend from StringIO import StringIO except: __all__.extend def dump(obj, file, protocol = None, bin = None): Pickler(file, protocol, bin).dump(obj) def dumps(obj, protocol = None, bin = None): file = StringIO() Pickler(file, protocol, bin).dump(obj) return file.getvalue() def load(file): return Unpickler(file).load() def loads(str): file = StringIO(str) return Unpickler(file).load() def _test(): import doctest return doctest.testmod() if __name__ == '__main__': _test()