Compiler

src/commons/binary.ts

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+/**
+ * SAA1099Tracker: Binary utilities.
+ * Copyright (c) 2017-2019 Roman Borik <pmd85emu@gmail.com>
+ * Copyright (c) 2022 Martin Borik <martin@borik.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+ * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+//---------------------------------------------------------------------------------------
+
+export const equalsByteArrays = (
+  b1: Uint8Array, off1: number,
+  b2: Uint8Array, off2: number,
+  len: number
+): boolean => {
+  if (len <= 0 || off1 < 0 || off1 >= b1.length || off2 < 0 || off2 >= b2.length) {
+    throw 'Argument(s) len, off1 or off2 is out of array ranges.';
+  }
+  if (off1 + len > b1.length || off2 + len > b2.length) {
+    return false;
+  }
+  for (let i: number = 0; i < len; i++) {
+    if (b1[off1 + i] !== b2[off2 + i]) {
+      return false;
+    }
+  }
+  return true;
+};
+
+export const stringToBytes = (str: string, asciiOnly?: boolean): Uint8Array =>
+  Uint8Array.from(
+    str.split('')
+      .map(c => c.charCodeAt(0))
+      .filter(c => asciiOnly ? (c >= 32 && c <= 126) : true)
+  );
+
+export const bytesToString = (bytes: Uint8Array): string =>
+  String.fromCharCode.apply(null, bytes);
+
+export const writeWordLE = (bytes: Uint8Array, offset: number, word: number) => {
+  bytes[offset] = (word & 0xFF);
+  bytes[offset + 1] = ((word >>> 8) & 0xFF);
+};