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#!/usr/bin/python3
def tr(x):
"""Translate a 6-bit value to the Base64 alphabet."""
s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' \
+ 'abcdefghijklmnopqrstuvwxyz' \
+ '0123456789' \
+ '+/'
return ord(s[x])
def table(fn):
"""Generate a 12-bit lookup table."""
ret = []
for n in range(0, 2**12):
pre = "\n\t" if n % 8 == 0 else " "
pre = "\t" if n == 0 else pre
ret.append("{}0x{:04X}U,".format(pre, fn(n)))
return "".join(ret)
def table_be():
"""Generate a 12-bit big-endian lookup table."""
return table(lambda n: (tr(n & 0x3F) << 0) | (tr(n >> 6) << 8))
def table_le():
"""Generate a 12-bit little-endian lookup table."""
return table(lambda n: (tr(n >> 6) << 0) | (tr(n & 0x3F) << 8))
def main():
"""Entry point."""
lines = [
"#include <stdint.h>",
"",
"const uint16_t base64_table_enc_12bit[] = {",
"#if BASE64_LITTLE_ENDIAN",
table_le(),
"#else",
table_be(),
"#endif",
"};"
]
for line in lines:
print(line)
if __name__ == "__main__":
main()
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