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Dion Moult
a0ba3c0b98
Splits the v13 metadata wire-format knowledge out of the FILE*-bound streaming reader into pure, buffer-based functions so the web byte-range path (#88) can reuse it without loading the whole sidecar into the wasm heap: - parseSidecarHead — validates the 16-byte head, yields num_vertex_bytes - parseSidecarTail — parses meshes/instances/georef/elements/strings from an in-memory tail buffer, bounds-checked - planSidecarReadRanges + SidecarReadPlan — the range-coalescing / scatter planner, promoted out of the anonymous namespace readSidecarMetadataOnly and the range readers now call these; desktop behaviour is unchanged (head + tail are small, the bulk is still skipped via seek). The metadata tail is split from the head around the bulk sections, so a blob-backed loader just slices those two regions and hands the bytes to the same parsers. Closes a coverage gap: StreamingLoader had no unit tests. Adds test_streaming_loader.cpp (7 cases: metadata round-trip, corrupt/truncated rejection, vertex+index range scatter, head validation, tail truncation, read-plan coalescing). 107/107 unit tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>