Module invpart 

Autodesk Inventor files (.ipt, .iam): the segments below the OLE storage RSeStorage (see docs/src/research/inventor-display-preview.md).

Every segment has a meta stream M<id> and a data stream B<id>:

M<id>: u32 25 "RSe Meta Stream Version 8" | u16 | 16 bytes
       | u32 n, n × UTF-16 segment name | class UUID | 3 × u32
       | u32 n, ASCII date | u32 n, ASCII date | u8 | zlib/zstd body:
         7 × u16 | u32 sections, sections × u32 (bit 31 + length) | u32
         | u32 n, n × 10 bytes | u32 | u32 n, n × 28 bytes | u32
         | u32 classes, classes × (UUID, u16, u32, u16, u32)
B<id>: 18 bytes | zlib/zstd body: per section
         u32 class word (low byte: class table index) | payload
         | u32 payload length again | u8 0

The bodies are zlib (Inventor 2019–2024 as tested) or Zstandard (newer files, issue #271), told apart by their magic bytes. Where the header of a Zstandard stream ends is not known from real files: the frame is taken at the zlib offset, else at the first Zstandard magic close to it.

Classes are named by the first 32 bits of their UUID (time_low). Every length is checked against the data before it is used, unpacked streams are capped, and a damaged file is an error, never a panic.

Structs

Array

A typed array: its element type and raw elements.

Cursor

Reads typed values from a section payload.

Section

One section of a segment.

Sections

Iterator over the sections of a Segment.

Segment

One segment: its section lengths, its class table and the inflated data.

Constants

ARRAY

Marker of a typed array.

ELEM_KEYS

Element type of key arrays (u32 too).

ELEM_U32

Element type of u32 arrays.

POINT2F

Array element class: f32 2D point.

POINT3F

Array element class: f32 point (x, y, z).

VECTOR3F

Array element class: f32 unit vector.

Functions

read_stream

A whole stream of the compound file, at most limit bytes.

segment

The segment named name (e.g. PmGraphicsSegment), inflating at most limit bytes; Ok(None) when the file has no such segment.