const fs = require('fs');
const filePath = 'c:\\Users\\matthias.hoesch\\.gemini\\antigravity\\scratch\\vda-to-edifact-converter\\samples\\test_efz.edi';
const buffer = fs.readFileSync(filePath);

console.log('File size:', buffer.length);

const searchStr = 'Precision';
const searchBuf = Buffer.from(searchStr, 'utf8');

let index = buffer.indexOf(searchBuf);
if (index !== -1) {
    console.log('Found "' + searchStr + '" at byte offset:', index);
    const start = Math.max(0, index - 30);
    const end = Math.min(buffer.length, index + 40);
    const context = buffer.slice(start, end);
    console.log('Context (hex):', context.toString('hex'));
    console.log('Context (utf8):', context.toString('utf8'));
    console.log('Context (latin1):', context.toString('latin1'));
} else {
    console.log('"' + searchStr + '" not found in file.');
}