我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用pickle.read()。
def read_string4(f): r""" >>> import StringIO >>> read_string4(StringIO.StringIO("\x00\x00\x00\x00abc")) '' >>> read_string4(StringIO.StringIO("\x03\x00\x00\x00abcdef")) 'abc' >>> read_string4(StringIO.StringIO("\x00\x00\x00\x03abcdef")) Traceback (most recent call last): ... ValueError: expected 50331648 bytes in a string4, but only 6 remain """ n = read_int4(f) if n < 0: raise ValueError("string4 byte count < 0: %d" % n) data = f.read(n) if len(data) == n: return data raise ValueError("expected %d bytes in a string4, but only %d remain" % (n, len(data)))
def read_long1(f): r""" >>> import StringIO >>> read_long1(StringIO.StringIO("\x00")) 0L >>> read_long1(StringIO.StringIO("\x02\xff\x00")) 255L >>> read_long1(StringIO.StringIO("\x02\xff\x7f")) 32767L >>> read_long1(StringIO.StringIO("\x02\x00\xff")) -256L >>> read_long1(StringIO.StringIO("\x02\x00\x80")) -32768L """ n = read_uint1(f) data = f.read(n) if len(data) != n: raise ValueError("not enough data in stream to read long1") return decode_long(data)
def read_long4(f): r""" >>> import StringIO >>> read_long4(StringIO.StringIO("\x02\x00\x00\x00\xff\x00")) 255L >>> read_long4(StringIO.StringIO("\x02\x00\x00\x00\xff\x7f")) 32767L >>> read_long4(StringIO.StringIO("\x02\x00\x00\x00\x00\xff")) -256L >>> read_long4(StringIO.StringIO("\x02\x00\x00\x00\x00\x80")) -32768L >>> read_long1(StringIO.StringIO("\x00\x00\x00\x00")) 0L """ n = read_int4(f) if n < 0: raise ValueError("long4 byte count < 0: %d" % n) data = f.read(n) if len(data) != n: raise ValueError("not enough data in stream to read long4") return decode_long(data)
def read_string4(f): r""" >>> import io >>> read_string4(io.BytesIO(b"\x00\x00\x00\x00abc")) '' >>> read_string4(io.BytesIO(b"\x03\x00\x00\x00abcdef")) 'abc' >>> read_string4(io.BytesIO(b"\x00\x00\x00\x03abcdef")) Traceback (most recent call last): ... ValueError: expected 50331648 bytes in a string4, but only 6 remain """ n = read_int4(f) if n < 0: raise ValueError("string4 byte count < 0: %d" % n) data = f.read(n) if len(data) == n: return data.decode("latin-1") raise ValueError("expected %d bytes in a string4, but only %d remain" % (n, len(data)))
def read_long1(f): r""" >>> import io >>> read_long1(io.BytesIO(b"\x00")) 0 >>> read_long1(io.BytesIO(b"\x02\xff\x00")) 255 >>> read_long1(io.BytesIO(b"\x02\xff\x7f")) 32767 >>> read_long1(io.BytesIO(b"\x02\x00\xff")) -256 >>> read_long1(io.BytesIO(b"\x02\x00\x80")) -32768 """ n = read_uint1(f) data = f.read(n) if len(data) != n: raise ValueError("not enough data in stream to read long1") return decode_long(data)
def read_long4(f): r""" >>> import io >>> read_long4(io.BytesIO(b"\x02\x00\x00\x00\xff\x00")) 255 >>> read_long4(io.BytesIO(b"\x02\x00\x00\x00\xff\x7f")) 32767 >>> read_long4(io.BytesIO(b"\x02\x00\x00\x00\x00\xff")) -256 >>> read_long4(io.BytesIO(b"\x02\x00\x00\x00\x00\x80")) -32768 >>> read_long1(io.BytesIO(b"\x00\x00\x00\x00")) 0 """ n = read_int4(f) if n < 0: raise ValueError("long4 byte count < 0: %d" % n) data = f.read(n) if len(data) != n: raise ValueError("not enough data in stream to read long4") return decode_long(data)
def read_uint1(f): r""" >>> import StringIO >>> read_uint1(StringIO.StringIO('\xff')) 255 """ data = f.read(1) if data: return ord(data) raise ValueError("not enough data in stream to read uint1")
def read_uint2(f): r""" >>> import StringIO >>> read_uint2(StringIO.StringIO('\xff\x00')) 255 >>> read_uint2(StringIO.StringIO('\xff\xff')) 65535 """ data = f.read(2) if len(data) == 2: return _unpack("<H", data)[0] raise ValueError("not enough data in stream to read uint2")
def read_int4(f): r""" >>> import StringIO >>> read_int4(StringIO.StringIO('\xff\x00\x00\x00')) 255 >>> read_int4(StringIO.StringIO('\x00\x00\x00\x80')) == -(2**31) True """ data = f.read(4) if len(data) == 4: return _unpack("<i", data)[0] raise ValueError("not enough data in stream to read int4")
def read_unicodestringnl(f): r""" >>> import StringIO >>> read_unicodestringnl(StringIO.StringIO("abc\uabcd\njunk")) u'abc\uabcd' """ data = f.readline() if not data.endswith('\n'): raise ValueError("no newline found when trying to read " "unicodestringnl") data = data[:-1] # lose the newline return unicode(data, 'raw-unicode-escape')
def read_unicodestring4(f): r""" # bug 24549 #>>> import StringIO #>>> s = u'abcd\uabcd' #>>> enc = s.encode('utf-8') #>>> enc #'abcd\xea\xaf\x8d' #>>> n = chr(len(enc)) + chr(0) * 3 # little-endian 4-byte length #>>> t = read_unicodestring4(StringIO.StringIO(n + enc + 'junk')) #>>> s == t #True # #>>> read_unicodestring4(StringIO.StringIO(n + enc[:-1])) #Traceback (most recent call last): #... #ValueError: expected 7 bytes in a unicodestring4, but only 6 remain """ n = read_int4(f) if n < 0: raise ValueError("unicodestring4 byte count < 0: %d" % n) data = f.read(n) if len(data) == n: return unicode(data, 'utf-8') raise ValueError("expected %d bytes in a unicodestring4, but only %d " "remain" % (n, len(data)))
def read_float8(f): r""" #>>> import StringIO, struct #>>> raw = struct.pack(">d", -1.25) #>>> raw #'\xbf\xf4\x00\x00\x00\x00\x00\x00' #>>> read_float8(StringIO.StringIO(raw + "\n")) #-1.25 """ data = f.read(8) if len(data) == 8: return _unpack(">d", data)[0] raise ValueError("not enough data in stream to read float8")
def read_unicodestring4(f): r""" >>> import StringIO >>> s = u'abcd\uabcd' >>> enc = s.encode('utf-8') >>> enc 'abcd\xea\xaf\x8d' >>> n = chr(len(enc)) + chr(0) * 3 # little-endian 4-byte length >>> t = read_unicodestring4(StringIO.StringIO(n + enc + 'junk')) >>> s == t True >>> read_unicodestring4(StringIO.StringIO(n + enc[:-1])) Traceback (most recent call last): ... ValueError: expected 7 bytes in a unicodestring4, but only 6 remain """ n = read_int4(f) if n < 0: raise ValueError("unicodestring4 byte count < 0: %d" % n) data = f.read(n) if len(data) == n: return unicode(data, 'utf-8') raise ValueError("expected %d bytes in a unicodestring4, but only %d " "remain" % (n, len(data)))
def read_float8(f): r""" >>> import StringIO, struct >>> raw = struct.pack(">d", -1.25) >>> raw '\xbf\xf4\x00\x00\x00\x00\x00\x00' >>> read_float8(StringIO.StringIO(raw + "\n")) -1.25 """ data = f.read(8) if len(data) == 8: return _unpack(">d", data)[0] raise ValueError("not enough data in stream to read float8")
def read_uint1(f): r""" >>> import io >>> read_uint1(io.BytesIO(b'\xff')) 255 """ data = f.read(1) if data: return data[0] raise ValueError("not enough data in stream to read uint1")
def read_uint2(f): r""" >>> import io >>> read_uint2(io.BytesIO(b'\xff\x00')) 255 >>> read_uint2(io.BytesIO(b'\xff\xff')) 65535 """ data = f.read(2) if len(data) == 2: return _unpack("<H", data)[0] raise ValueError("not enough data in stream to read uint2")
def read_int4(f): r""" >>> import io >>> read_int4(io.BytesIO(b'\xff\x00\x00\x00')) 255 >>> read_int4(io.BytesIO(b'\x00\x00\x00\x80')) == -(2**31) True """ data = f.read(4) if len(data) == 4: return _unpack("<i", data)[0] raise ValueError("not enough data in stream to read int4")
def read_unicodestringnl(f): r""" >>> import io >>> read_unicodestringnl(io.BytesIO(b"abc\\uabcd\njunk")) == 'abc\uabcd' True """ data = f.readline() if not data.endswith(b'\n'): raise ValueError("no newline found when trying to read " "unicodestringnl") data = data[:-1] # lose the newline return str(data, 'raw-unicode-escape')
def read_unicodestring4(f): r""" >>> import io >>> s = 'abcd\uabcd' >>> enc = s.encode('utf-8') >>> enc b'abcd\xea\xaf\x8d' >>> n = bytes([len(enc), 0, 0, 0]) # little-endian 4-byte length >>> t = read_unicodestring4(io.BytesIO(n + enc + b'junk')) >>> s == t True >>> read_unicodestring4(io.BytesIO(n + enc[:-1])) Traceback (most recent call last): ... ValueError: expected 7 bytes in a unicodestring4, but only 6 remain """ n = read_int4(f) if n < 0: raise ValueError("unicodestring4 byte count < 0: %d" % n) data = f.read(n) if len(data) == n: return str(data, 'utf-8', 'surrogatepass') raise ValueError("expected %d bytes in a unicodestring4, but only %d " "remain" % (n, len(data)))
def read_float8(f): r""" >>> import io, struct >>> raw = struct.pack(">d", -1.25) >>> raw b'\xbf\xf4\x00\x00\x00\x00\x00\x00' >>> read_float8(io.BytesIO(raw + b"\n")) -1.25 """ data = f.read(8) if len(data) == 8: return _unpack(">d", data)[0] raise ValueError("not enough data in stream to read float8")
