author | jjkang |
Fri, 11 Jun 2010 15:22:40 +0800 | |
changeset 2 | 9da1e5517a66 |
parent 0 | ae805ac0140d |
permissions | -rw-r--r-- |
0
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"""Implements (a subset of) Sun XDR -- eXternal Data Representation. |
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See: RFC 1014 |
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""" |
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import struct |
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try: |
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from cStringIO import StringIO as _StringIO |
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except ImportError: |
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from StringIO import StringIO as _StringIO |
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|
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__all__ = ["Error", "Packer", "Unpacker", "ConversionError"] |
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# exceptions |
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class Error(Exception): |
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"""Exception class for this module. Use: |
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except xdrlib.Error, var: |
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# var has the Error instance for the exception |
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Public ivars: |
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msg -- contains the message |
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""" |
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def __init__(self, msg): |
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self.msg = msg |
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def __repr__(self): |
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return repr(self.msg) |
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def __str__(self): |
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return str(self.msg) |
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class ConversionError(Error): |
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pass |
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class Packer: |
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"""Pack various data representations into a buffer.""" |
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def __init__(self): |
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self.reset() |
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def reset(self): |
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self.__buf = _StringIO() |
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def get_buffer(self): |
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return self.__buf.getvalue() |
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# backwards compatibility |
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get_buf = get_buffer |
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def pack_uint(self, x): |
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self.__buf.write(struct.pack('>L', x)) |
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pack_int = pack_uint |
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pack_enum = pack_int |
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def pack_bool(self, x): |
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if x: self.__buf.write('\0\0\0\1') |
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else: self.__buf.write('\0\0\0\0') |
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def pack_uhyper(self, x): |
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self.pack_uint(x>>32 & 0xffffffffL) |
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self.pack_uint(x & 0xffffffffL) |
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pack_hyper = pack_uhyper |
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def pack_float(self, x): |
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try: self.__buf.write(struct.pack('>f', x)) |
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except struct.error, msg: |
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raise ConversionError, msg |
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def pack_double(self, x): |
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try: self.__buf.write(struct.pack('>d', x)) |
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except struct.error, msg: |
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raise ConversionError, msg |
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def pack_fstring(self, n, s): |
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if n < 0: |
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raise ValueError, 'fstring size must be nonnegative' |
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data = s[:n] |
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n = ((n+3)//4)*4 |
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data = data + (n - len(data)) * '\0' |
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self.__buf.write(data) |
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|
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pack_fopaque = pack_fstring |
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def pack_string(self, s): |
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n = len(s) |
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self.pack_uint(n) |
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self.pack_fstring(n, s) |
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pack_opaque = pack_string |
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pack_bytes = pack_string |
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def pack_list(self, list, pack_item): |
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for item in list: |
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self.pack_uint(1) |
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pack_item(item) |
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self.pack_uint(0) |
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102 |
|
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103 |
def pack_farray(self, n, list, pack_item): |
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if len(list) != n: |
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raise ValueError, 'wrong array size' |
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106 |
for item in list: |
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pack_item(item) |
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108 |
|
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109 |
def pack_array(self, list, pack_item): |
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n = len(list) |
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self.pack_uint(n) |
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112 |
self.pack_farray(n, list, pack_item) |
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|
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114 |
|
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115 |
|
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116 |
class Unpacker: |
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117 |
"""Unpacks various data representations from the given buffer.""" |
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118 |
|
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119 |
def __init__(self, data): |
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120 |
self.reset(data) |
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121 |
|
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def reset(self, data): |
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123 |
self.__buf = data |
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self.__pos = 0 |
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125 |
|
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def get_position(self): |
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127 |
return self.__pos |
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diff
changeset
|
128 |
|
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|
129 |
def set_position(self, position): |
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|
130 |
self.__pos = position |
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|
131 |
|
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|
132 |
def get_buffer(self): |
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|
133 |
return self.__buf |
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diff
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|
134 |
|
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|
135 |
def done(self): |
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|
136 |
if self.__pos < len(self.__buf): |
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|
137 |
raise Error('unextracted data remains') |
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parents:
diff
changeset
|
138 |
|
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|
139 |
def unpack_uint(self): |
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|
140 |
i = self.__pos |
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parents:
diff
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|
141 |
self.__pos = j = i+4 |
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|
142 |
data = self.__buf[i:j] |
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|
143 |
if len(data) < 4: |
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|
144 |
raise EOFError |
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changeset
|
145 |
x = struct.unpack('>L', data)[0] |
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parents:
diff
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|
146 |
try: |
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parents:
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|
147 |
return int(x) |
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parents:
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changeset
|
148 |
except OverflowError: |
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parents:
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|
149 |
return x |
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changeset
|
150 |
|
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|
151 |
def unpack_int(self): |
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|
152 |
i = self.__pos |
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|
153 |
self.__pos = j = i+4 |
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|
154 |
data = self.__buf[i:j] |
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|
155 |
if len(data) < 4: |
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|
156 |
raise EOFError |
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|
157 |
return struct.unpack('>l', data)[0] |
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|
158 |
|
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|
159 |
unpack_enum = unpack_int |
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|
160 |
|
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|
161 |
def unpack_bool(self): |
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|
162 |
return bool(self.unpack_int()) |
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changeset
|
163 |
|
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|
164 |
def unpack_uhyper(self): |
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|
165 |
hi = self.unpack_uint() |
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|
166 |
lo = self.unpack_uint() |
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|
167 |
return long(hi)<<32 | lo |
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diff
changeset
|
168 |
|
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|
169 |
def unpack_hyper(self): |
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|
170 |
x = self.unpack_uhyper() |
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|
171 |
if x >= 0x8000000000000000L: |
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|
172 |
x = x - 0x10000000000000000L |
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|
173 |
return x |
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|
174 |
|
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|
175 |
def unpack_float(self): |
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|
176 |
i = self.__pos |
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|
177 |
self.__pos = j = i+4 |
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|
178 |
data = self.__buf[i:j] |
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|
179 |
if len(data) < 4: |
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|
180 |
raise EOFError |
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|
181 |
return struct.unpack('>f', data)[0] |
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|
182 |
|
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|
183 |
def unpack_double(self): |
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|
184 |
i = self.__pos |
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|
185 |
self.__pos = j = i+8 |
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|
186 |
data = self.__buf[i:j] |
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|
187 |
if len(data) < 8: |
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|
188 |
raise EOFError |
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|
189 |
return struct.unpack('>d', data)[0] |
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|
190 |
|
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|
191 |
def unpack_fstring(self, n): |
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|
192 |
if n < 0: |
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|
193 |
raise ValueError, 'fstring size must be nonnegative' |
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|
194 |
i = self.__pos |
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|
195 |
j = i + (n+3)//4*4 |
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|
196 |
if j > len(self.__buf): |
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changeset
|
197 |
raise EOFError |
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|
198 |
self.__pos = j |
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|
199 |
return self.__buf[i:i+n] |
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changeset
|
200 |
|
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|
201 |
unpack_fopaque = unpack_fstring |
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changeset
|
202 |
|
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|
203 |
def unpack_string(self): |
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|
204 |
n = self.unpack_uint() |
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|
205 |
return self.unpack_fstring(n) |
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changeset
|
206 |
|
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changeset
|
207 |
unpack_opaque = unpack_string |
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diff
changeset
|
208 |
unpack_bytes = unpack_string |
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parents:
diff
changeset
|
209 |
|
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diff
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|
210 |
def unpack_list(self, unpack_item): |
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|
211 |
list = [] |
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parents:
diff
changeset
|
212 |
while 1: |
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parents:
diff
changeset
|
213 |
x = self.unpack_uint() |
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diff
changeset
|
214 |
if x == 0: break |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
215 |
if x != 1: |
ae805ac0140d
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parents:
diff
changeset
|
216 |
raise ConversionError, '0 or 1 expected, got %r' % (x,) |
ae805ac0140d
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parents:
diff
changeset
|
217 |
item = unpack_item() |
ae805ac0140d
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parents:
diff
changeset
|
218 |
list.append(item) |
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parents:
diff
changeset
|
219 |
return list |
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parents:
diff
changeset
|
220 |
|
ae805ac0140d
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parents:
diff
changeset
|
221 |
def unpack_farray(self, n, unpack_item): |
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diff
changeset
|
222 |
list = [] |
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parents:
diff
changeset
|
223 |
for i in range(n): |
ae805ac0140d
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parents:
diff
changeset
|
224 |
list.append(unpack_item()) |
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parents:
diff
changeset
|
225 |
return list |
ae805ac0140d
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parents:
diff
changeset
|
226 |
|
ae805ac0140d
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parents:
diff
changeset
|
227 |
def unpack_array(self, unpack_item): |
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diff
changeset
|
228 |
n = self.unpack_uint() |
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parents:
diff
changeset
|
229 |
return self.unpack_farray(n, unpack_item) |
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parents:
diff
changeset
|
230 |
|
ae805ac0140d
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parents:
diff
changeset
|
231 |
|
ae805ac0140d
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parents:
diff
changeset
|
232 |
# test suite |
ae805ac0140d
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parents:
diff
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|
233 |
def _test(): |
ae805ac0140d
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parents:
diff
changeset
|
234 |
p = Packer() |
ae805ac0140d
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parents:
diff
changeset
|
235 |
packtest = [ |
ae805ac0140d
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parents:
diff
changeset
|
236 |
(p.pack_uint, (9,)), |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
237 |
(p.pack_bool, (True,)), |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
238 |
(p.pack_bool, (False,)), |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
239 |
(p.pack_uhyper, (45L,)), |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
240 |
(p.pack_float, (1.9,)), |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
241 |
(p.pack_double, (1.9,)), |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
242 |
(p.pack_string, ('hello world',)), |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
243 |
(p.pack_list, (range(5), p.pack_uint)), |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
244 |
(p.pack_array, (['what', 'is', 'hapnin', 'doctor'], p.pack_string)), |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
245 |
] |
ae805ac0140d
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Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
246 |
succeedlist = [1] * len(packtest) |
ae805ac0140d
DP tools release version Revision: 200912
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parents:
diff
changeset
|
247 |
count = 0 |
ae805ac0140d
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parents:
diff
changeset
|
248 |
for method, args in packtest: |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
249 |
print 'pack test', count, |
ae805ac0140d
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parents:
diff
changeset
|
250 |
try: |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
251 |
method(*args) |
ae805ac0140d
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Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
252 |
print 'succeeded' |
ae805ac0140d
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parents:
diff
changeset
|
253 |
except ConversionError, var: |
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254 |
print 'ConversionError:', var.msg |
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255 |
succeedlist[count] = 0 |
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256 |
count = count + 1 |
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257 |
data = p.get_buffer() |
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258 |
# now verify |
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259 |
up = Unpacker(data) |
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260 |
unpacktest = [ |
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261 |
(up.unpack_uint, (), lambda x: x == 9), |
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|
262 |
(up.unpack_bool, (), lambda x: x is True), |
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263 |
(up.unpack_bool, (), lambda x: x is False), |
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264 |
(up.unpack_uhyper, (), lambda x: x == 45L), |
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265 |
(up.unpack_float, (), lambda x: 1.89 < x < 1.91), |
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|
266 |
(up.unpack_double, (), lambda x: 1.89 < x < 1.91), |
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|
267 |
(up.unpack_string, (), lambda x: x == 'hello world'), |
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|
268 |
(up.unpack_list, (up.unpack_uint,), lambda x: x == range(5)), |
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|
269 |
(up.unpack_array, (up.unpack_string,), |
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|
270 |
lambda x: x == ['what', 'is', 'hapnin', 'doctor']), |
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|
271 |
] |
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272 |
count = 0 |
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273 |
for method, args, pred in unpacktest: |
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274 |
print 'unpack test', count, |
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275 |
try: |
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|
276 |
if succeedlist[count]: |
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277 |
x = method(*args) |
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278 |
print pred(x) and 'succeeded' or 'failed', ':', x |
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279 |
else: |
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280 |
print 'skipping' |
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281 |
except ConversionError, var: |
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282 |
print 'ConversionError:', var.msg |
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283 |
count = count + 1 |
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|
284 |
|
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|
285 |
|
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286 |
if __name__ == '__main__': |
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287 |
_test() |