Embroidery format SPX

Spx files are Pfaff machine binary stitch files.

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All files start with magic numbers 25 73 70 78 25 (%spx%).

01 01 01 ---

Section tag 01 01 01. 08-0B Following that we have the remaining number of bytes in the file, in a 4 byte big endian number.

We then have in the 01 01 01 block 0x50 characters that typically read:

• 00 4E 00 20 00 20 00 20 00 20 00 20 00 20 00 20
• 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20
• 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20
• 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20
• 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20

07 01 01 ---

Section tag 07 01 01.

5F-62 Following that we have the remaining bytes in the file, in a 4 byte big endian number.

We then have 0x2A character of:

• 00 01 06 01 01 00 00 00 6D 01 03 E8 00 00 07 01
• 00 01 00 01 00 00 00 00 19 00 00 00 00 00 00 00
• 00 00 00 00 00 00 00 00 00 00

• 8C-8F Then a we have the width in micrometers. So 5000 (dec) for a 5mm, and 49900 for a 49.9mm wide design.

• 90-92 This is followed by a 4 byte big endian number which is twice the width.

Followed by some unchanging data:

• 03 00 00 01 F4 00 00 0F A0 00 00 2E E0 00 00 8C
• A0 00 00 01 F4 00 00 03 E8 00 00 07 D0 00 00 00
• 00

• B4-B7 This is followed by the height in a 4 byte big endian number.

Then we have another bunch of unchanging characters:

• 00 00 EA 60 03 00 00 00 00 00 00 0B B8 00 00 17
• 70 00 00 23 28 00 00 00 FA 00 00 01 F4 00 00 03
• E8 01 05 01 01 00 00 00 1E 00 00 00 00 00 00 00
• 00 00 00 00 00 00 00 00 00 19

• F2-F5 Then the width again in 4 byte big endian.
• F6-F9 Then the height again in 4 byte big endian.

And we finish out the section with:

• 00 00 00 00 00 01

03 01 01 --- Section starts exactly at 0x100

103-106: Following that we have the remaining bytes in the file, in a 4 byte big endian number.

We 4 4-byte big endian numbers conveying some information about size.

00 00 00 64 00 00 00 64 00 00 00 64 00 00 00 00

02 01 01 ---

We then enter section 02 01 01:

• Following that we have the remaining bytes in the file, in a 4 byte big endian number.

This is the stitches section:

• All stitches are grouped into 9 bytes. The first two bytes is always 80 2F and the last two are always 80 0F.

• 80 2F XX XX YY YY CC 80 0F
• XX XX is 2 bytes of little-endian signed relative coordinate.
• YY YY is 2 bytes of little-endian signed relative coordinate.
• CC is usually 00, F6 and 0A are also frequently seen values.