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Add SPZ v4 (NGSP / ZSTD multi-stream) read and write support #332

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Add SPZ v4 (NGSP / ZSTD multi-stream) read and write support #332

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397e191
Add SPZ v4 (NGSP / ZSTD multi-stream) read and write support
May 4, 2026
8fde2e7
Add v4 (NGSP / ZSTD) read support to Rust SPZ decoder
May 4, 2026
c42cb9f
Merge v4_decoded flag into existing done flag in SPZ decoder
udwinj May 18, 2026
5faeb6b
Restructure v4 SPZ decoder as an explicit stage state machine
udwinj May 18, 2026
37fdc4b
Extract shared SPZ header prefix into parse_common_header
udwinj May 18, 2026
b836655
Restructure SpzDecoder::push into explicit append/advance phases
udwinj May 18, 2026
ecc2ae5
Remove redundant try_decode_v4() call in finish() for v4 stream
udwinj May 18, 2026
a6ed593
Warn when SPZ v4 file has extensions but decoder skips them
udwinj May 19, 2026
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1 change: 1 addition & 0 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,7 @@
"spark-rs": "file:rust/spark-rs/pkg"
},
"dependencies": {
"@bokuweb/zstd-wasm": "^0.0.27",
"fflate": "^0.8.2"
},
"peerDependencies": {
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7 changes: 7 additions & 0 deletions rust/Cargo.lock
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1 change: 1 addition & 0 deletions rust/Cargo.toml
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Expand Up @@ -24,6 +24,7 @@ itertools = "0.14.0"
js-sys = "0.3.77"
miniz_oxide = "0.8.9"
ordered-float = "5.1.0"
ruzstd = { version = "0.7.3", default-features = false, features = ["std"] }
serde = { version = "1.0.228", features = ["derive"] }
serde_json = "1.0.145"
serde-wasm-bindgen = "0.6.5"
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1 change: 1 addition & 0 deletions rust/spark-lib/Cargo.toml
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Expand Up @@ -14,6 +14,7 @@ glam.workspace = true
half.workspace = true
ordered-float.workspace = true
miniz_oxide.workspace = true
ruzstd.workspace = true
serde.workspace = true
smallvec.workspace = true
itertools.workspace = true
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4 changes: 4 additions & 0 deletions rust/spark-lib/src/decoder.rs
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Expand Up @@ -474,6 +474,10 @@ impl<T: SplatReceiver> ChunkReceiver for MultiDecoder<T> {
if (magic & 0x00ffffff) == PLY_MAGIC {
return self.init_file_type(SplatFileType::PLY);
}
if magic == SPZ_MAGIC {
// NGSP magic at file start — SPZ v4 (ZSTD multi-stream, not gzip-wrapped)
return self.init_file_type(SplatFileType::SPZ);
}
if (magic & 0x00ffffff) == GZIP_MAGIC {
// Gzipped file, unpack beginning to check magic number
if self.buffer_gz.is_none() {
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