HUS

Status

What it is

HUS is a legacy Husqvarna Viking machine format. It is still supplied by many design sellers for older machines.

Satin Studio behavior

Satin Studio documents this format for identification and inspection. It does not open or export the file.

Versions and variants

HUS is a compressed legacy format. Relationship to VIP and other VSM-family formats should be proven with files, not assumed.

File identification notes

Reported structure uses compressed stitch bytes with ARJ-like table compression behavior. Palette behavior, section layout, and command decoding still need independent validation before support.

Observed structure notes

• Observed HUS files begin with little-endian header fields: magic, stitch count, color count, positive/negative extents, command stream offset, X stream offset, and Y stream offset.
• After a short name/unknown area and color indexes, the command, X, and Y byte streams are stored separately and compressed. They expand to parallel arrays of command byte, signed X delta, and signed Y delta.
• Observed command bytes include 0x80 stitch, 0x81 jump, 0x84 color change, 0x88 trim, and 0x90 end.

Structure sketch

HUS is a compressed, parallel-stream format in observed files:

struct HusFile<'a> {
    magic: u32,
    stitch_count: u32,
    color_count: u32,
    extent_pos_x: i16,
    extent_pos_y: i16,
    extent_neg_x: i16,
    extent_neg_y: i16,
    command_offset: u32,
    x_offset: u32,
    y_offset: u32,
    name_or_unknown: [u8; 8],
    unknown_16: u16,
    color_indexes: &'a [u16],
    command_compressed: &'a [u8],
    x_compressed: &'a [u8],
    y_compressed: &'a [u8],
}

enum HusCommand {
    Stitch = 0x80,
    Jump = 0x81,
    ColorChange = 0x84,
    Trim = 0x88,
    End = 0x90,
}

Compatibility evidence

The notes above help identify and inspect the format; they do not imply import or export support. Keep the original file and record the machine and software that produced it.