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automatically find the best format to encode extended types

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This commit is contained in:
Antonio Cuni 2013-10-18 15:45:50 +02:00
parent 522c4bfc79
commit c727440ba5
2 changed files with 38 additions and 8 deletions
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28
msgpack/fallback.py
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@ -545,13 +545,29 @@ class Packer(object):
# overridden by subclasses
return None
def pack_extended_type(self, fmt, typecode, data):
# for now we support only this. We should add support for the other
# fixext/ext formats
assert fmt == "ext 32"
def pack_extended_type(self, typecode, data):
assert 0 <= typecode <= 127
N = len(data)
self._buffer.write(struct.pack('>BIB', 0xc9, N, typecode))
n = len(data)
if n == 1:
header = struct.pack(">BB", 0xd4, typecode) # fixext 1
elif n == 2:
header = struct.pack(">BB", 0xd5, typecode) # fixext 2
elif n == 4:
header = struct.pack(">BB", 0xd6, typecode) # fixext 4
elif n == 8:
header = struct.pack(">BB", 0xd7, typecode) # fixext 8
elif n == 16:
header = struct.pack(">BB", 0xd8, typecode) # fixext 16
elif n <= 2**8-1:
header = struct.pack(">BBB", 0xc7, n, typecode) # ext 8
elif n <= 2**16-1:
header = struct.pack(">BHB", 0xc8, n, typecode) # ext 16
elif n <= 2**32-1:
header = struct.pack(">BIB", 0xc9, n, typecode) # ext 32
else:
raise PackValueError("ext data too large")
#
self._buffer.write(header)
self._buffer.write(data)
def pack(self, obj):