emcc -o zstd.js -O0 \
-s WASM=1 \
-s "MODULARIZE=1" \
-s EXPORTED_FUNCTIONS="['_ZSTD_isError', '_ZSTD_getFrameContentSize', '_ZSTD_decompress']" \
-s EXTRA_EXPORTED_RUNTIME_METHODS="['cwrap','ccall']" \
-s 'EXPORT_NAME="ZstdLib"' \
lib/libzstd.bc
Created
July 12, 2018 17:52
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WebAssemblyをNodejs環境なしで試す
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| <html> | |
| <head> | |
| <title>Zstd wasm test</title> | |
| <script type='text/javascript' src="./zstd.js"></script> | |
| <script type="text/javascript" src="./run.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| ZstdLib().then(function(Module) { | |
| var zstd = new ZstdCodec(Module); | |
| // === test === | |
| // fetch('test.txt.zst') | |
| // .then(function(response) { | |
| // return response.arrayBuffer(); | |
| // }) | |
| // .then(function(bytes) { | |
| // var res = zstd.decompress(new Uint8Array(bytes)); | |
| // }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| "use strict"; | |
| class ZstdCodec { | |
| constructor(Module) { | |
| this.zstd = Module; | |
| this.ZSTD_isError = this.zstd.cwrap('ZSTD_isError', 'number', ['number']); | |
| this.ZSTD_getFrameContentSize = this.zstd.cwrap('ZSTD_getFrameContentSize', 'number', ['array', 'number']); | |
| this.ZSTD_decompress = this.zstd.cwrap('ZSTD_decompress', 'number', ['number', 'number', 'array', 'number']); | |
| } | |
| isError(zstd_rc) { | |
| return this.ZSTD_isError(zstd_rc); | |
| } | |
| getFrameContentSize(zstd_bytes) { | |
| const content_size = this.ZSTD_getFrameContentSize(zstd_bytes, zstd_bytes.length); | |
| const content_size_limit = 1 * 1024 * 1024; | |
| return content_size <= content_size_limit ? content_size : null; | |
| } | |
| decompress(zstd_bytes) { | |
| console.log(zstd_bytes); | |
| const content_size = this.getFrameContentSize(zstd_bytes); | |
| if (!content_size) return null; | |
| const heap = this.zstd._malloc(content_size); | |
| try { | |
| const decompress_rc = this.ZSTD_decompress(heap, content_size, zstd_bytes, zstd_bytes.length); | |
| if (this.isError(decompress_rc) || decompress_rc != content_size) return null; | |
| return new Uint8Array(this.zstd.HEAPU8.buffer, heap, content_size); | |
| } finally { | |
| this.zstd._free(heap); | |
| } | |
| } | |
| } |
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