saving

node_modules/@msgpack/msgpack/dist/CachedKeyDecoder.js

@@ -0,0 +1,63 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CachedKeyDecoder = void 0;
+const utf8_1 = require("./utils/utf8");
+const DEFAULT_MAX_KEY_LENGTH = 16;
+const DEFAULT_MAX_LENGTH_PER_KEY = 16;
+class CachedKeyDecoder {
+    constructor(maxKeyLength = DEFAULT_MAX_KEY_LENGTH, maxLengthPerKey = DEFAULT_MAX_LENGTH_PER_KEY) {
+        this.maxKeyLength = maxKeyLength;
+        this.maxLengthPerKey = maxLengthPerKey;
+        this.hit = 0;
+        this.miss = 0;
+        // avoid `new Array(N)`, which makes a sparse array,
+        // because a sparse array is typically slower than a non-sparse array.
+        this.caches = [];
+        for (let i = 0; i < this.maxKeyLength; i++) {
+            this.caches.push([]);
+        }
+    }
+    canBeCached(byteLength) {
+        return byteLength > 0 && byteLength <= this.maxKeyLength;
+    }
+    find(bytes, inputOffset, byteLength) {
+        const records = this.caches[byteLength - 1];
+        FIND_CHUNK: for (const record of records) {
+            const recordBytes = record.bytes;
+            for (let j = 0; j < byteLength; j++) {
+                if (recordBytes[j] !== bytes[inputOffset + j]) {
+                    continue FIND_CHUNK;
+                }
+            }
+            return record.str;
+        }
+        return null;
+    }
+    store(bytes, value) {
+        const records = this.caches[bytes.length - 1];
+        const record = { bytes, str: value };
+        if (records.length >= this.maxLengthPerKey) {
+            // `records` are full!
+            // Set `record` to an arbitrary position.
+            records[(Math.random() * records.length) | 0] = record;
+        }
+        else {
+            records.push(record);
+        }
+    }
+    decode(bytes, inputOffset, byteLength) {
+        const cachedValue = this.find(bytes, inputOffset, byteLength);
+        if (cachedValue != null) {
+            this.hit++;
+            return cachedValue;
+        }
+        this.miss++;
+        const str = (0, utf8_1.utf8DecodeJs)(bytes, inputOffset, byteLength);
+        // Ensure to copy a slice of bytes because the byte may be NodeJS Buffer and Buffer#slice() returns a reference to its internal ArrayBuffer.
+        const slicedCopyOfBytes = Uint8Array.prototype.slice.call(bytes, inputOffset, inputOffset + byteLength);
+        this.store(slicedCopyOfBytes, str);
+        return str;
+    }
+}
+exports.CachedKeyDecoder = CachedKeyDecoder;
+//# sourceMappingURL=CachedKeyDecoder.js.map