# 离线只读验证：不访问网络、不操作设备，只读取同目录合成输入。
import json, math, struct, statistics
from pathlib import Path
def check(d):
 c=d['srgb_byte']/255
 linear=c/12.92 if c<=0.04045 else ((c+0.055)/1.055)**2.4
 valid=lambda v:len(v)==4 and all(0<=x<=1 for x in v)
 return dict(srgb_normalized=round(c,6),linear=round(linear,6),bad_factor_valid=valid(d['factor_bad']),normalized_factor_valid=valid(d['factor_normalized']))

if __name__=='__main__':
 fixture=json.loads(Path(__file__).with_name('fixture.json').read_text(encoding='utf-8'))
 actual=check(fixture['input'])
 assert actual==fixture['expected'], {'实际':actual,'预期':fixture['expected']}
 print(json.dumps({'状态':'通过','实际':actual,'边界':'仅离线合成样例，现场未测'},ensure_ascii=False))