Eng:Scratch File Format (1.4)/Inline Values

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This article or section documents a feature not included in the current version of Scratch (3.0). It is only useful from a historical perspective.

This is part of a technical description of the file format.

Inline values — nil, true, false, integers, and floats — are simply encoded inline as fields in Objects in an Object Table.

Note: References are also found as Object fields, although they are not inline values.

List of Inline Values

classID, type	Squeak Function, structure
1: nil	n/a (constant value)
2: true	n/a (constant value)
3: false	n/a (constant value)
4: SmallInteger	SmallInt - signed 32-bit integer
5: SmallInteger16	SmallInt - signed 16-bit integer
6: LargePositiveInteger	length: 16-bit integer, followed by that many bytes.
7: LargeNegativeInteger	(same as above)
8: Float	8 bytes

"Squeak function" refers to the function in the Squeak source code used to parse that type (eg. getSmallInt, putSmallInt.)

References

• Primitive Data Types in Java