Comma-Separated Values (.csv)
RFC StandardnoComma-Separated Values (CSV) is a ubiquitous plain-text format for tabular data, where each line represents a data record and fields are separated by delimiter characters.
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Pregledaj i metapodaci
Operativni sistemi i analizatori datoteka identifikuju CSV datoteke proverom početnog binarnog niza bajtova:
Potpis zaglavlja na nivou bajtova (Magic Bytes)
Operativni sistemi i analizatori datoteka identifikuju CSV datoteke proverom početnog binarnog niza bajtova:
HEX POTPIS (OFFSET 0):
Plain TextASCII REPREZENTACIJA: ASCII / UTF-8
Standardizacija: RFC 4180 / IETF
Tehničke specifikacije
| Arhitektura kontejnera | Delimited flat text file representing tabular data rows and columns |
| Kompresija | Gzip / Deflate achieves 85%-95% compression on repetitive tabular records |
| Bajtni redosled (Endianness) | UTF-8 text stream (optional UTF-8 BOM EF BB BF used by Excel) |
| Prostori boja | Not applicable |
| Kanali i struktura | Row records delimited by CRLF with columns delimited by commas |
| Maksimalne dimenzije | Unbounded; streamable to gigabytes without loading entire file in memory |
| Transparentnost | Not applicable |
| Strimovanje i progresivno učitavanje | Native line-by-line stream processing supported by all data pipelines |
Tehnička matrica poređenja: CSV vs Konkurenti
| Tehnički atribut | CSV (Trenutno) | Excel (XLSX) | Parquet | JSON |
|---|---|---|---|---|
| File Type | Plain text flat table | Zipped XML spreadsheet | Binary columnar storage | Hierarchical text |
| Multiple Sheets | No (single flat table only) | Yes (multiple workbooks and sheets) | Partition-based storage | Nested arrays and objects |
| Data Types | Untyped raw text | Typed cells, formulas, formatting | Strict binary column types | Primitive types (string, number, bool) |
| Big Data Analytics | Slow (requires reading every row linearly) | Not suitable for big data | Ultra-fast (column pruning & predicate pushdown) | Moderate |
Uobičajeni režimi oštećenja i vodič za heksadecimalni oporavak
⚠️ Columns shift to the right or row counts do not match.
Osnovni uzrok: A text field containing an unescaped comma without surrounding quotation marks.
Oporavak: RFC 4180 requires fields containing commas to be wrapped in double quotes: "Smith, John".
⚠️ Accented characters render as strange symbols (mojibake like é instead of é) in Excel.
Osnovni uzrok: Excel opened a UTF-8 CSV assuming the legacy Windows ANSI/CP1252 character encoding.
Oporavak: Prepend the 3-byte UTF-8 Byte Order Mark (0xEF 0xBB 0xBF) to the beginning of the file.
Bezbednosna analiza i vektori napada parsera
CSV files open directly in spreadsheet software like Excel and Google Sheets, exposing users to Formula Injection (CSV Injection) attacks.
Poznati vektori napada
- Formula Injection: Cells starting with '=', '+', '-', or '@' executing spreadsheet macros or DDE commands (e.g. '=cmd|' /C calc'!A0').
- Data exfiltration via HYPERLINK() formulas sending sensitive cell data to remote attacker servers upon click.
Defanzivne najbolje prakse: When exporting user data to CSV, prepend a single quote (') or tab to any cell starting with '=', '+', '-', or '@' to force plain text rendering in Excel.
Istorijat i prekretnice
Ključne prednosti
- Maximum simplicity: readable in any text editor and importable into every database and spreadsheet.
- Extremely fast line-by-line streaming without building a full in-memory DOM.
- Minimal overhead: no verbose tag syntax or schema definitions.
Tehnička ograničenja i nedostaci
- No standard data types: numbers, dates, booleans, and text are all stored as raw strings.
- No support for multiple sheets, cell formatting, formulas, or metadata.
- Delimiter conflicts (commas inside text, decimal commas in European locales) cause frequent parsing bugs.
Zanimljivosti
- In many European countries where commas are used as decimal points, semicolons (;) are used instead of commas as CSV separators.
- Microsoft Excel historically required a UTF-8 BOM (0xEF 0xBB 0xBF) to correctly display non-ASCII accented characters.
Često postavljana tehnička pitanja
What is RFC 4180?
RFC 4180 is the official IETF standard for CSV. It mandates that fields containing commas, line breaks, or double quotes must be enclosed in double quotes, and internal quotes must be escaped by doubling them ("").
Why do CSV files open with corrupted characters in Excel?
Older versions of Microsoft Excel default to the local Windows code page (like Windows-1252) rather than UTF-8 when opening CSV files directly. Adding a UTF-8 BOM (Byte Order Mark) at the start of the file forces Excel to decode UTF-8 correctly.
Povezani parovi konverzije za CSV
Export Microsoft Excel spreadsheets into clean, comma-separated plain text tables.
Import CSV tabular data into formatted Microsoft Excel XLSX workbooks.
Import tabular CSV spreadsheet records directly into indexed SQLite database tables.
Extract table records and rows from SQL INSERT statements into standardized comma-separated CSV spreadsheets.
Extract multidimensional scientific datasets and numerical matrices from HDF5 (.h5) into tabular CSV format.
Flatten multidimensional NetCDF (.nc) climate and oceanographic variables into comma-separated CSV spreadsheets.
Convert electronic business cards (vCard / VCF) into tabular CSV contact lists for Excel and Google Contacts.