Crate hypc 

hypc: HPC1 reader/writer with SMC1 and GEOT support.

Byte-level format derived from the provided reference implementation.

Layout (header): b“HPC1“ (4) version: u32 (4) = 1 flags: u32 (4) bit0 => tilekey present count: u32 (4) number of points qbits: u8 (1) must be 16 reserved: [u8; 11] (11) tilekey payload if flags bit0 set decode_min: [f32; 3] (12) decode_max: [f32; 3] (12) payload: count * 3 * (qbits/8) bytes (for qbits=16 => count*6)

Trailing chunks: “SMC1” + u32(len) + payload(v1) -> semantic mask; encoding 0(raw) or 1(zlib) “GEOT” + fixed 24 bytes (v1) -> bbox in CRS:84 with Q7 (1e-7 deg) quantization.

Unknown chunks are assumed to be “TAG + u32 length + payload” for skipping.

Structs

GeoExtentDeg

HypcPointCloud

In-memory representation of an HPC1 point cloud.

HypcWrite

Parameters for writing an HPC1 file.

SemanticMask

Enums

GeoCrs

Smc1Encoding

TileKey

Constants

FLAG_TILEKEY_PRESENT

Functions

pack_tilekey

Encode TileKey into flags+reserved field.

read

Read HPC1 + optional chunks from an arbitrary reader (must implement Seek for skipping).

read_file

Read HPC1 + optional chunks from a path.

unpack_tilekey

Decode TileKey from flags+reserved if present/recognized.

write

Write HPC1 + optional chunks to an arbitrary writer.

write_file

Write HPC1 + optional chunks to a path.

Type Aliases

Smc1ClassEntry

Palette entry: (class_id, precedence)