Compressed archive file
application/octet-stream
Magic Bytes
Offset: 10
23 20 54 68 69 73 20 69 73 20 61 20 73 68 65 6C 6C 20 61 72 63 68 69 76 65
LHA is a legacy compressed archive format originally developed by Haruyasu Yoshizaki for efficient file storage and transfer on MS-DOS and Amiga systems. It is primarily used to bundle multiple files and directories into a single compressed entity to save disk space. While largely replaced by the ZIP format in modern computing, LHA remains relevant for retrocomputing enthusiasts and for extracting historical data from older software repositories.
Validation Code
How to validate .lha files in Python
Python
def is_lha(file_path: str) -> bool:
"""
Check if file is a valid LHA by magic bytes.
Signature offset: 10 bytes
"""
signature = bytes([0x23, 0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x61, 0x20, 0x73, 0x68, 0x65, 0x6C, 0x6C, 0x20, 0x61, 0x72, 0x63, 0x68, 0x69, 0x76, 0x65])
with open(file_path, "rb") as f:
f.seek(10)
return f.read(25) == signatureHow to validate .lha files in Node.js
Node.js
function isLHA(buffer: Buffer): boolean {
// Signature offset: 10 bytes
const signature = Buffer.from([0x23, 0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x61, 0x20, 0x73, 0x68, 0x65, 0x6C, 0x6C, 0x20, 0x61, 0x72, 0x63, 0x68, 0x69, 0x76, 0x65]);
if (buffer.length < 35) return false;
return buffer.subarray(10, 35).equals(signature);
}
Go
func IsLHA(data []byte) bool {
// Signature offset: 10 bytes
signature := []byte{0x23, 0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x61, 0x20, 0x73, 0x68, 0x65, 0x6C, 0x6C, 0x20, 0x61, 0x72, 0x63, 0x68, 0x69, 0x76, 0x65}
if len(data) < 35 {
return false
}
return bytes.Equal(data[10:35], signature)
}API Endpoint
GET
/api/v1/lha
curl https://filesignature.org/api/v1/lha