friendly-hex/fhex/parse.py

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import math
from fhex.words import ADJECTIVE, PARTICIPLE, NOUN, PHONETIC
DEFAULT_FORMAT_DEF = {
"A": ADJECTIVE,
"P": PARTICIPLE,
"N": NOUN,
"F": PHONETIC,
}
def hex_to_friendly(hex_str, format_str):
hex_i, fmt_i = 0, 0
words = []
fmt_def = DEFAULT_FORMAT_DEF
while hex_i < len(hex_str):
if fmt_i >= len(format_str):
raise Exception("Format string is too short")
fmt_code = format_str[fmt_i]
if fmt_code not in fmt_def:
raise Exception(f"Unrecognized format code: {fmt_code}")
fmt_list = fmt_def[fmt_code]
fmt_len = math.log(len(fmt_list), 16)
if fmt_len % 1 != 0:
raise Exception(
f"Word list for {fmt_code} must be a power of 16" +
" (length: {len(fmt_list)})")
fmt_len = int(fmt_len)
if hex_i + fmt_len > len(hex_str):
raise Exception(f"Not enough hex characters for format code {fmt_code}")
hex_part = hex_str[hex_i:hex_i + fmt_len]
fmt_list_i = int(hex_part, 16)
word = fmt_list[fmt_list_i]
words.append(word)
hex_i += fmt_len
fmt_i += 1
if fmt_i != len(format_str):
raise Exception("Format string is too long")
return words