nodejs-sjis

sjis-1.txt

あ﨑い

sjis-2.txt

あⅢい

sjis-3.txt

あ\い

sjis-4.txt

あ～い

sjis-test.js

const fs = require('fs')
const Iconv  = require('iconv').Iconv;

function loadTextFileContent(filePath,encoding){
  const iconv = Iconv(encoding, 'utf-8');
  const contents = iconv.convert(fs.readFileSync(filePath)).toString();
  return contents;
}
function check(fileName,encoding,check){
  const bin = Buffer(fs.readFileSync(fileName)).toString("hex").toUpperCase();
  try{
    const iconv = Iconv(encoding, 'utf-8');
    const contents = iconv.convert(fs.readFileSync(fileName)).toString();
    const assert = check == contents ? "YES" : "NO";
    console.log(`${fileName} bin=[${bin}] content=[${contents}] assert=[${assert}] isEqual=[${check}]`);
  }catch(e){
    console.log(`${fileName} bin=[${bin}] error ${e}`);
  }
}
function check1(encoding){
  console.log(`${encoding} でチェック`);
  check("./sjis-1.txt",encoding,"あ﨑い");
  check("./sjis-2.txt",encoding,"あⅢい");
  check("./sjis-3.txt",encoding,"あ\\い");
  check("./sjis-4.txt",encoding,"あ～い");
}

check1("Shift_JIS");
check1("CP932");

/*
Shift_JIS でチェック
./sjis-1.txt bin=[82A0FAB182A2] error Error: Illegal character sequence.
./sjis-2.txt bin=[82A0875682A2] error Error: Illegal character sequence.
./sjis-3.txt bin=[82A05C82A2] content=[あ¥い] assert=[NO] isEqual=[あ\い]
./sjis-4.txt bin=[82A0816082A2] content=[あ〜い] assert=[NO] isEqual=[あ～い]
CP932 でチェック
./sjis-1.txt bin=[82A0FAB182A2] content=[あ﨑い] assert=[YES] isEqual=[あ﨑い]
./sjis-2.txt bin=[82A0875682A2] content=[あⅢい] assert=[YES] isEqual=[あⅢい]
./sjis-3.txt bin=[82A05C82A2] content=[あ\い] assert=[YES] isEqual=[あ\い]
./sjis-4.txt bin=[82A0816082A2] content=[あ〜い] assert=[NO] isEqual=[あ～い]
*/

https://twitter.com/Fushihara/status/891699476334731264 で使うためのコード