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39 lines
1.1 KiB
Python
Executable File
39 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import print_function
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CRC_POLY = 0x04C11DB7
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CRC_WIDTH = 32
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def precompute_table(bits):
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lookup_table = []
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for i in xrange(2**bits):
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rr = i << (CRC_WIDTH - bits)
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for x in xrange(bits):
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if rr & 0x80000000:
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rr = (rr << 1) ^ CRC_POLY
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else:
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rr <<= 1
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lookup_table.append(rr & 0xffffffff)
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return lookup_table
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print('static const uint32_t s_lookup_table[] = {')
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for entry in precompute_table(4):
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print(' 0x{:08x},'.format(entry))
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print('};')
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