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File Formats

ODF

Open Document Format

An ISO-standardized XML-based file format for office documents (text, spreadsheets, presentations).

Detalhe técnico

Understanding odf requires knowledge of file structure — how headers, metadata, and payload data are organized within the binary layout. Most file formats begin with a magic number (signature bytes) that identifies the format independently of the file extension: PDF starts with %PDF-, PNG with \x89PNG, ZIP with PK. MIME type detection combines magic number inspection with file extension matching. Format specifications define the exact byte layout, enabling tools to parse, validate, and convert files correctly.

Exemplo

```javascript
// ODF: file format detection
const header = new Uint8Array(await file.slice(0, 4).arrayBuffer());
const signature = Array.from(header).map(b => b.toString(16)).join(' ');
// PDF: '25 50 44 46' (%PDF)
// PNG: '89 50 4e 47' (.PNG)
// ZIP: '50 4b 03 04' (PK..)
```

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