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50 lines
1.3 KiB
Python
Executable File
50 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python
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import argparse
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import os
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parser = argparse.ArgumentParser(description="""Generate the COMPONENT_INFORMATION checksums (CRC32) header file""")
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parser.add_argument('--output', metavar='checksums.h', help='output file')
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parser.add_argument('files', nargs='+', metavar='input_file.json', help='files to generate CRC from')
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args = parser.parse_args()
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filename = args.output
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files = args.files
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def create_table():
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a = []
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for i in range(256):
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k = i
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for j in range(8):
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if k & 1:
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k ^= 0x1db710640
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k >>= 1
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a.append(k)
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return a
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# MAVLink's CRC32
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def crc_update(buf, crc_table, crc):
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for k in buf:
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crc = (crc >> 8) ^ crc_table[(crc & 0xff) ^ k]
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return crc
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crc_table = create_table()
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with open(filename, 'w') as outfile:
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outfile.write("#pragma once\n")
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outfile.write("#include <stdint.h>\n")
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outfile.write("namespace component_information {\n")
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for filename in files:
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file_crc = 0
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for line in open(filename, "rb"):
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file_crc = crc_update(line, crc_table, file_crc)
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basename = os.path.basename(filename)
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identifier = basename.split('.')[0]
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outfile.write("static constexpr uint32_t {:}_crc = {:};\n".format(identifier, file_crc))
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outfile.write("}\n")
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