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py: Add ustruct.pack_into and unpack_from

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This commit is contained in:
Dave Hylands
2015-12-23 19:11:27 -08:00
committed by Damien George
parent ac16cc9a35
commit a17755ee8b
3 changed files with 118 additions and 19 deletions
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41
tests/basics/struct1.py
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@@ -66,3 +66,44 @@ except TypeError:
# but later were implemented for all.
print(struct.unpack("<3B2h", b"foo\x12\x34\xff\xff"))
print(struct.pack("<3B", 1, 2, 3))
# pack_into
buf = bytearray(b'>>>123<<<')
struct.pack_into('<bbb', buf, 3, 0x41, 0x42, 0x43)
print(buf)
struct.pack_into('<bbb', buf, -6, 0x44, 0x45, 0x46)
print(buf)
try:
struct.pack_into('<bbb', buf, 7, 0x41, 0x42, 0x43)
except:
print('struct.error')
try:
struct.pack_into('<bbb', buf, -10, 0x41, 0x42, 0x43)
except:
print('struct.error')
# unpack_from
buf = b'0123456789'
print(struct.unpack_from('<b', buf, 4))
print(struct.unpack_from('<b', buf, -4))
try:
print(struct.unpack_from('<b', buf, 10))
except:
print('struct.error')
try:
print(struct.unpack_from('<b', buf, -11))
except:
print('struct.error')
# pack with too many args, not checked by uPy
#try:
# print(struct.pack('ii', 1, 2, 3))
#except:
# print('struct.error')
# pack with too few args, not checked by uPy
#try:
# print(struct.pack('ii', 1))
#except:
# print('struct.error')