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44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
var brotli = require('./build/encode');
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/**
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* Compresses the given buffer
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* The second parameter is optional and specifies whether the buffer is
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* text or binary data (the default is binary).
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* Returns null on error
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*/
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module.exports = function(buffer, opts) {
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// default to binary data
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var quality = 11;
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var mode = 0;
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var lgwin = 22;
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if (typeof opts === 'boolean') {
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mode = opts ? 0 : 1;
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} else if (typeof opts === 'object') {
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quality = opts.quality || 11;
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mode = opts.mode || 0;
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lgwin = opts.lgwin || 22;
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}
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// allocate input buffer and copy data to it
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var buf = brotli._malloc(buffer.length);
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brotli.HEAPU8.set(buffer, buf);
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// allocate output buffer (same size + some padding to be sure it fits), and encode
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var outBuf = brotli._malloc(buffer.length + 1024);
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var encodedSize = brotli._encode(quality, lgwin, mode, buffer.length, buf, buffer.length, outBuf);
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var outBuffer = null;
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if (encodedSize !== -1) {
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// allocate and copy data to an output buffer
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outBuffer = new Uint8Array(encodedSize);
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outBuffer.set(brotli.HEAPU8.subarray(outBuf, outBuf + encodedSize));
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}
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// free malloc'd buffers
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brotli._free(buf);
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brotli._free(outBuf);
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return outBuffer;
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};
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