Module tagged 

The tagged binary format of Creo sections (docs/src/research/creo-brep-preview.md).

A section is a stream of values whose schema is written on first use: e0 TT name 00 defines field number N (in order of appearance) with type TT, and the value follows. The writer remembers, for every field, which transition came after it last time – how many struct levels close and which field comes next – and only writes the tokens that differ (f1 f2 f3/f4 N close levels, f7 NN names the next field, f0 is “zero closes, explicitly”). Structs begin with e2/e3, e1 is null, f8 N/f9 R C/fa K d… start arrays (dimensions are remembered per field; fc R reuses the column count), fb precedes the elements of a struct array, e4–e7 N repeat the previous array element.

Integers: 00–7f, 80–bf + 1 byte, c0–df + 2 bytes, e8–eb

• 1–4 bytes, f5 <int> negated, f6 = −1. Doubles: see double.

Modules

double

Compact doubles of the tagged format.

Structs

Field

Tree

A parsed section.

Enums

Node

Functions

parse

Parses a tagged section.