mirror of https://github.com/dirtbags/netarch.git
92 lines
2.2 KiB
Python
92 lines
2.2 KiB
Python
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"""Endianness conversions.
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This is a blatant rip-off of the golang binary library.
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I'm not too proud to steal a nicely-thought-out API.
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"""
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def byte(v):
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return v & 0xff
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class ByteOrder:
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"A ByteOrder specifies how to convert byte sequences into 16-, 32-, or 64-bit unsigned integers."
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pass
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class LittleEndian(ByteOrder):
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"Little-Endian byte order"
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def Uint16(self, b:bytes) -> int:
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return b[0] | (b[1]<<8)
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def PutUint16(self, v:int) -> bytes:
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return bytes([
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byte(v),
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byte(v>>8),
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])
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def Uint32(self, b:bytes) -> int:
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return b[0] | (b[1]<<8) | (b[2]<<16) | (b[3]<<24)
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def PutUint16(self, v:int) -> bytes:
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return bytes([
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byte(v),
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byte(v>>8),
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byte(v>>16),
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byte(v>>24),
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])
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def Uint64(self, b:bytes) -> int:
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return b[0] | (b[1]<<8) | (b[2]<<16) | (b[3]<<24) | \
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(b[4]<<32) | (b[5]<<40) | (b[6]<<48) | (b[7]<<56)
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def PutUint64(self, v:int) -> bytes:
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return bytes([
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byte(v),
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byte(v>>8),
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byte(v>>16),
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byte(v>>24),
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byte(v>>32),
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byte(v>>40),
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byte(v>>48),
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byte(v>>56),
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])
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class BigEndian(ByteOrder):
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"Big-Endian byte order"
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def Uint16(self, b:bytes) -> int:
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return b[1] | (b[0]<<8)
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def PutUint16(self, v:int) -> bytes:
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return bytes([
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byte(v>>8),
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byte(v),
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])
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def Uint32(self, b:bytes) -> int:
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return b[3] | (b[2]<<8) | (b[1]<<16) | (b[0]<<24)
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def PutUint16(self, v:int) -> bytes:
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return bytes([
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byte(v>>24),
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byte(v>>16),
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byte(v>>8),
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byte(v),
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])
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def Uint64(self, b:bytes) -> int:
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return b[7] | (b[6]<<8) | (b[5]<<16) | (b[4]<<24) | \
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(b[3]<<32) | (b[2]<<40) | (b[1]<<48) | (b[0]<<56)
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def PutUint64(self, v:int) -> bytes:
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return bytes([
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byte(v>>56),
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byte(v>>48),
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byte(v>>40),
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byte(v>>32),
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byte(v>>24),
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byte(v>>16),
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byte(v>>8),
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byte(v),
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])
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