FILE HEADERS

QDOS file headers consist of a 64 byte file data block in the directory.

Filenames can be up to 36 characters long (not including the drive name).

Executable files have file type 1 and an associated dataspace value, while
ordinary data files (including BASIC programs) are file type 0

OFFSET LENGTH    DESCRIPTION
$00    long      file length (in bytes)
 (decimal 0)

$04    byte      file access key (not implemented on original QLs)
 (decimal 4)

$05    byte      file type
 (decimal 5)     0=a data file or SuperBASIC program
                 1=an executable file
                 2=SROFF relocatable object file
                 255=directory
                 3=Thor directory
                 4=font file in 'The Painter'
                 5=pattern file in The Painter
                 6=4 colour mode compressed picture in The Painter
                 11=8 colour mode compressed picture in The Painter

$06    8 bytes   if file type is an executable file (type 1), the first long
 (decimal 6)     word contains the default dataspace size of the program in
                 bytes

$0E    word     length of filename
 (decimal 14)

$10    36 bytes characters of the filename
 (decimal 16)

$34    long     file update date
 (decimal 52)

$38    long     file reference date
 (decimal 56)

$3C    long     file backup date
 (decimal 60)