detectFormat

fnArchiveFormat detectFormat(const(ubyte)[] headerBytes)

Detect archive format from header bytes.

Examines magic bytes and known signatures at fixed offsets to identify the archive format. Falls back to registered provider detect functions if built-in detection does not match.

Parameters

headerBytesFirst N bytes of the archive. Typically 8-262 bytes are sufficient; TAR requires at least 262 bytes for ustar detection at offset 257.

Returns

The detected ArchiveFormat, or AUTO_DETECT if the format could not

be determined from the provided bytes.

Supported detections:

  • ZIP: 4-byte magic (PK\\x03\\x04)
  • 7-Zip: 6-byte magic (7z\\xBC\\xAF\\x27\\x1C)
  • RAR4: 7-byte magic (Rar!\\x1A\\x07\\x00)
  • RAR5: 7-byte magic (Rar!\\x1A\\x07\\x01\\x00)
  • AR: 8-byte magic (!<arch>\\n)
  • CAB: 4-byte magic (MSCF)
  • XAR: 4-byte magic (xar!\\x00)
  • CPIO: 6-byte magic ("070701", "070702", "070707")
  • TAR: "ustar" at offset 257
  • ISO9660: "CD001" at offset 32769 (needs at least 32774 bytes)