62 lines
3 KiB
JavaScript
62 lines
3 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.encodeIntoCompressedBase64 = exports.decodeFromCompressedBase64 = exports.decompress = void 0;
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/*
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* This is a TypeScript port of the original Java version, which was written by
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* Gil Tene as described in
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* https://github.com/HdrHistogram/HdrHistogram
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* and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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const JsHistogram_1 = require("./JsHistogram");
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const ByteBuffer_1 = require("./ByteBuffer");
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const wasm_1 = require("./wasm");
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// @ts-ignore
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const base64 = require("base64-js");
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const JsHistogram_encoding_1 = require("./JsHistogram.encoding");
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const V2CompressedEncodingCookieBase = 0x1c849304;
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const compressedEncodingCookie = V2CompressedEncodingCookieBase | 0x10; // LSBit of wordsize byte indicates TLZE Encoding
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function decompress(data) {
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const buffer = new ByteBuffer_1.default(data);
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const initialTargetPosition = buffer.position;
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const cookie = buffer.getInt32();
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if ((cookie & ~0xf0) !== V2CompressedEncodingCookieBase) {
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throw new Error("Encoding not supported, only V2 is supported");
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}
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const lengthOfCompressedContents = buffer.getInt32();
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const uncompressedBuffer = JsHistogram_encoding_1.inflate(buffer.data.slice(initialTargetPosition + 8, initialTargetPosition + 8 + lengthOfCompressedContents));
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return uncompressedBuffer;
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}
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exports.decompress = decompress;
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exports.decodeFromCompressedBase64 = (base64String, bitBucketSize = 32, useWebAssembly = false, minBarForHighestTrackableValue = 0) => {
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const data = base64.toByteArray(base64String.trim());
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const uncompressedData = decompress(data);
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if (useWebAssembly) {
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return wasm_1.WasmHistogram.decode(uncompressedData, bitBucketSize, minBarForHighestTrackableValue);
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}
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return JsHistogram_1.JsHistogram.decode(uncompressedData, bitBucketSize, minBarForHighestTrackableValue);
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};
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function encodeWasmIntoCompressedBase64(compressionLevel) {
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const compressionOptions = compressionLevel
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? { level: compressionLevel }
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: {};
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const self = this;
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const targetBuffer = ByteBuffer_1.default.allocate();
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targetBuffer.putInt32(compressedEncodingCookie);
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const uncompressedData = self.encode();
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const compressedData = JsHistogram_encoding_1.deflate(uncompressedData, compressionOptions);
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targetBuffer.putInt32(compressedData.byteLength);
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targetBuffer.putArray(compressedData);
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return base64.fromByteArray(targetBuffer.data);
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}
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wasm_1.WasmHistogram.prototype.encodeIntoCompressedBase64 = encodeWasmIntoCompressedBase64;
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exports.encodeIntoCompressedBase64 = (histogram, compressionLevel) => {
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if (histogram instanceof wasm_1.WasmHistogram) {
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return histogram.encodeIntoCompressedBase64(compressionLevel);
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}
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if (histogram instanceof JsHistogram_1.JsHistogram) {
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return histogram.encodeIntoCompressedBase64(compressionLevel);
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}
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throw new Error("Unsupported Histogram implementation");
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};
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//# sourceMappingURL=encoding.js.map
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