mrtz
30a7fc8fb0
Cache / build-and-push (push) Successful in 4m6s
Much of the works was already done in https://github.com/otytlandsvik/SZ3-wasm Thanks @oletytlandsvik :)
76 lines
2.4 KiB
Nix
76 lines
2.4 KiB
Nix
{
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lib,
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stdenv,
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fetchFromGitHub,
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emscripten,
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zstd,
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}:
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stdenv.mkDerivation {
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pname = "sz3-wasm";
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# NOTE: the SZ3 `rev` below MUST stay in sync with `by-name/sz3` — the SZ3
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# bitstream format is tied to a specific version (the stream embeds SZ3_DATA_VER
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# and is checked on decode), so the wasm decoder must be built from the exact
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# same source as whatever encoder produced the chunks.
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version = "3.3.2";
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src = fetchFromGitHub {
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owner = "szcompressor";
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repo = "SZ3";
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rev = "34b36f2af0d43aa4f5dea0e39500e91f6d35c9cf";
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sha256 = "0fckf5939m9d2w3095isnq3qfrz8fxpppn7y3c2hwzdh72vdzic7";
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};
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# zstd is SZ3's lossless backend. SZ3's tools/zstd uses CMake FetchContent to
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# download zstd at build time, which does not work offline, so we compile the
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# zstd C sources from nixpkgs' zstd source directly.
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zstdSrc = zstd.src;
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nativeBuildInputs = [ emscripten ];
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buildPhase = ''
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runHook preBuild
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# Emscripten's cache in the nix store is read-only; give it a writable one.
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export EM_CACHE=$TMPDIR/emcache
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export HOME=$TMPDIR
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mkdir -p $EM_CACHE
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mkdir -p gen/SZ3
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substitute include/SZ3/version.hpp.in gen/SZ3/version.hpp \
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--subst-var-by PROJECT_NAME SZ3 \
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--subst-var-by PROJECT_VERSION 3.3.2 \
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--subst-var-by PROJECT_VERSION_MAJOR 3 \
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--subst-var-by PROJECT_VERSION_MINOR 3 \
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--subst-var-by PROJECT_VERSION_PATCH 2 \
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--subst-var-by PROJECT_VERSION_TWEAK 0 \
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--subst-var-by SZ3_DATA_VERSION 3.3.2
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ZSTD_SRCS="$zstdSrc/lib/common/*.c $zstdSrc/lib/compress/*.c $zstdSrc/lib/decompress/*.c"
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em++ -std=c++17 -O3 -DNDEBUG -sMEMORY64=1 \
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-I gen -I include -I tools/sz3c/include -I "$zstdSrc/lib" \
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tools/sz3c/src/sz3c.cpp $ZSTD_SRCS \
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-sMODULARIZE=1 -sEXPORT_NAME=createSz3Module -sEXPORT_ES6=1 -sSINGLE_FILE=1 \
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-sEXPORTED_FUNCTIONS='["_SZ_decompress","_malloc","_free"]' \
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-sEXPORTED_RUNTIME_METHODS='["HEAPU8","HEAPF32","cwrap","ccall"]' \
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-sALLOW_MEMORY_GROWTH=1 -sENVIRONMENT=web,worker \
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-o sz3_decode.js
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runHook postBuild
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'';
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installPhase = ''
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runHook preInstall
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mkdir -p $out
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install -m644 sz3_decode.js $out/sz3_decode.js
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runHook postInstall
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'';
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meta = with lib; {
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description = "WebAssembly (wasm64) build of the SZ3 lossy decompressor C API for the browser";
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homepage = "https://github.com/szcompressor/SZ3";
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license = licenses.bsd3;
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platforms = platforms.unix;
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};
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}
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