Apple Core Audio File (.caf)

.caf file signature | audio/x-caf

Apple Core Audio File

Safe

Magic Bytes

Offset 0


              63 61 66 66 00 00

Sources: Apache Tika

All Known Signatures

6 signature variants are documented for .caf files across multiple sources.

Hex Signature	Offset	Sources
63 61 66 66 00 00	0	Apache Tika
63 61 66 66 00 01	0	Apache Tika
63 61 66 66 00 02	0	Apache Tika
63 61 66 66 40 00	0	Apache Tika
63 61 66 66 80 00	0	Apache Tika
63 61 66 66	0	Gary Kessler

Extension

.caf

MIME Type

audio/x-caf

Byte Offset

Risk Level

Safe

Validation Code

How to validate .caf files in Python

Python

def is_caf(file_path: str) -> bool:
    """Check if file is a valid CAF by magic bytes."""
    signature = bytes([0x63, 0x61, 0x66, 0x66, 0x00, 0x00])
    with open(file_path, "rb") as f:
        return f.read(6) == signature

How to validate .caf files in Node.js

Node.js

function isCAF(buffer: Buffer): boolean {
  const signature = Buffer.from([0x63, 0x61, 0x66, 0x66, 0x00, 0x00]);
  return buffer.subarray(0, 6).equals(signature);
}

How to validate .caf files in Go

func IsCAF(data []byte) bool {
    signature := []byte{0x63, 0x61, 0x66, 0x66, 0x00, 0x00}
    if len(data) < 6 {
        return false
    }
    return bytes.Equal(data[:6], signature)
}

API Endpoint

GET /api/v1/caf


              curl https://filesignature.org/api/v1/caf

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .caf file?

A .caf file is a Apple Core Audio File file. Apple Core Audio File

What are the magic bytes for .caf files?

The magic bytes for Apple Core Audio File files are 63 61 66 66 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .caf file?

To validate a .caf file, read the first bytes of the file and compare them against the known magic bytes (63 61 66 66 00 00) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .caf files?

The primary MIME type for .caf files is audio/x-caf.

Is it safe to open .caf files?

Apple Core Audio File (.caf) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.