PFM
application/x-font-printer-metric
Magic Bytes
Offset: 0
00 01 FF FF 00 00 43 6F 70 79 72
Printer Font Metrics (PFM) is a proprietary file format developed by Adobe Systems to provide character metric data for Type 1 PostScript fonts on Windows platforms. This format is primarily used by graphics software and printer drivers to determine character spacing, kerning, and line heights when rendering or printing professional typography. Now considered a legacy format, PFM files are largely replaced by OpenType and TrueType formats but remain technically safe as they contain static metadata without executable code.
Validation Code
How to validate .pfm files in Python
Python
def is_pfm(file_path: str) -> bool:
"""Check if file is a valid PFM by magic bytes."""
signature = bytes([0x00, 0x01, 0xFF, 0xFF, 0x00, 0x00, 0x43, 0x6F, 0x70, 0x79, 0x72])
with open(file_path, "rb") as f:
return f.read(11) == signatureHow to validate .pfm files in Node.js
Node.js
function isPFM(buffer: Buffer): boolean {
const signature = Buffer.from([0x00, 0x01, 0xFF, 0xFF, 0x00, 0x00, 0x43, 0x6F, 0x70, 0x79, 0x72]);
return buffer.subarray(0, 11).equals(signature);
}
Go
func IsPFM(data []byte) bool {
signature := []byte{0x00, 0x01, 0xFF, 0xFF, 0x00, 0x00, 0x43, 0x6F, 0x70, 0x79, 0x72}
if len(data) < 11 {
return false
}
return bytes.Equal(data[:11], signature)
}API Endpoint
GET
/api/v1/pfm
curl https://filesignature.org/api/v1/pfm