ODC
application/vnd.oasis.opendocument.chart
Magic Bytes
Offset: 0
50 4B
The OpenDocument Chart (ODC) format is an XML-based file format for storing graphical charts, maintained by the Organization for the Advancement of Structured Information Standards (OASIS). It is primarily used within the LibreOffice and Apache OpenOffice suites to represent standalone chart data or integrated components within larger documents. As a ZIP-compressed archive of XML files, the format is generally considered safe, though it is increasingly superseded by embedding charts directly into spreadsheet or text files.
Validation Code
How to validate .odc files in Python
Python
def is_odc(file_path: str) -> bool:
"""Check if file is a valid ODC by magic bytes."""
signature = bytes([0x50, 0x4B])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .odc files in Node.js
Node.js
function isODC(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B]);
return buffer.subarray(0, 2).equals(signature);
}
Go
func IsODC(data []byte) bool {
signature := []byte{0x50, 0x4B}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
GET
/api/v1/odc
curl https://filesignature.org/api/v1/odc