First release

node_modules/@videojs/vhs-utils/cjs/byte-helpers.js

@@ -0,0 +1,323 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.reverseBytes = exports.sliceBytes = exports.bytesMatch = exports.concatTypedArrays = exports.stringToBytes = exports.bytesToString = exports.numberToBytes = exports.bytesToNumber = exports.IS_LITTLE_ENDIAN = exports.IS_BIG_ENDIAN = exports.ENDIANNESS = exports.toBinaryString = exports.toHexString = exports.toUint8 = exports.isTypedArray = exports.padStart = exports.countBytes = exports.countBits = void 0;
+
+var _window = _interopRequireDefault(require("global/window"));
+
+// const log2 = Math.log2 ? Math.log2 : (x) => (Math.log(x) / Math.log(2));
+var repeat = function repeat(str, len) {
+  var acc = '';
+
+  while (len--) {
+    acc += str;
+  }
+
+  return acc;
+}; // count the number of bits it would take to represent a number
+// we used to do this with log2 but BigInt does not support builtin math
+// Math.ceil(log2(x));
+
+
+var countBits = function countBits(x) {
+  return x.toString(2).length;
+}; // count the number of whole bytes it would take to represent a number
+
+
+exports.countBits = countBits;
+
+var countBytes = function countBytes(x) {
+  return Math.ceil(countBits(x) / 8);
+};
+
+exports.countBytes = countBytes;
+
+var padStart = function padStart(b, len, str) {
+  if (str === void 0) {
+    str = ' ';
+  }
+
+  return (repeat(str, len) + b.toString()).slice(-len);
+};
+
+exports.padStart = padStart;
+
+var isTypedArray = function isTypedArray(obj) {
+  return ArrayBuffer.isView(obj);
+};
+
+exports.isTypedArray = isTypedArray;
+
+var toUint8 = function toUint8(bytes) {
+  if (bytes instanceof Uint8Array) {
+    return bytes;
+  }
+
+  if (!Array.isArray(bytes) && !isTypedArray(bytes) && !(bytes instanceof ArrayBuffer)) {
+    // any non-number or NaN leads to empty uint8array
+    // eslint-disable-next-line
+    if (typeof bytes !== 'number' || typeof bytes === 'number' && bytes !== bytes) {
+      bytes = 0;
+    } else {
+      bytes = [bytes];
+    }
+  }
+
+  return new Uint8Array(bytes && bytes.buffer || bytes, bytes && bytes.byteOffset || 0, bytes && bytes.byteLength || 0);
+};
+
+exports.toUint8 = toUint8;
+
+var toHexString = function toHexString(bytes) {
+  bytes = toUint8(bytes);
+  var str = '';
+
+  for (var i = 0; i < bytes.length; i++) {
+    str += padStart(bytes[i].toString(16), 2, '0');
+  }
+
+  return str;
+};
+
+exports.toHexString = toHexString;
+
+var toBinaryString = function toBinaryString(bytes) {
+  bytes = toUint8(bytes);
+  var str = '';
+
+  for (var i = 0; i < bytes.length; i++) {
+    str += padStart(bytes[i].toString(2), 8, '0');
+  }
+
+  return str;
+};
+
+exports.toBinaryString = toBinaryString;
+var BigInt = _window.default.BigInt || Number;
+var BYTE_TABLE = [BigInt('0x1'), BigInt('0x100'), BigInt('0x10000'), BigInt('0x1000000'), BigInt('0x100000000'), BigInt('0x10000000000'), BigInt('0x1000000000000'), BigInt('0x100000000000000'), BigInt('0x10000000000000000')];
+
+var ENDIANNESS = function () {
+  var a = new Uint16Array([0xFFCC]);
+  var b = new Uint8Array(a.buffer, a.byteOffset, a.byteLength);
+
+  if (b[0] === 0xFF) {
+    return 'big';
+  }
+
+  if (b[0] === 0xCC) {
+    return 'little';
+  }
+
+  return 'unknown';
+}();
+
+exports.ENDIANNESS = ENDIANNESS;
+var IS_BIG_ENDIAN = ENDIANNESS === 'big';
+exports.IS_BIG_ENDIAN = IS_BIG_ENDIAN;
+var IS_LITTLE_ENDIAN = ENDIANNESS === 'little';
+exports.IS_LITTLE_ENDIAN = IS_LITTLE_ENDIAN;
+
+var bytesToNumber = function bytesToNumber(bytes, _temp) {
+  var _ref = _temp === void 0 ? {} : _temp,
+      _ref$signed = _ref.signed,
+      signed = _ref$signed === void 0 ? false : _ref$signed,
+      _ref$le = _ref.le,
+      le = _ref$le === void 0 ? false : _ref$le;
+
+  bytes = toUint8(bytes);
+  var fn = le ? 'reduce' : 'reduceRight';
+  var obj = bytes[fn] ? bytes[fn] : Array.prototype[fn];
+  var number = obj.call(bytes, function (total, byte, i) {
+    var exponent = le ? i : Math.abs(i + 1 - bytes.length);
+    return total + BigInt(byte) * BYTE_TABLE[exponent];
+  }, BigInt(0));
+
+  if (signed) {
+    var max = BYTE_TABLE[bytes.length] / BigInt(2) - BigInt(1);
+    number = BigInt(number);
+
+    if (number > max) {
+      number -= max;
+      number -= max;
+      number -= BigInt(2);
+    }
+  }
+
+  return Number(number);
+};
+
+exports.bytesToNumber = bytesToNumber;
+
+var numberToBytes = function numberToBytes(number, _temp2) {
+  var _ref2 = _temp2 === void 0 ? {} : _temp2,
+      _ref2$le = _ref2.le,
+      le = _ref2$le === void 0 ? false : _ref2$le;
+
+  // eslint-disable-next-line
+  if (typeof number !== 'bigint' && typeof number !== 'number' || typeof number === 'number' && number !== number) {
+    number = 0;
+  }
+
+  number = BigInt(number);
+  var byteCount = countBytes(number);
+  var bytes = new Uint8Array(new ArrayBuffer(byteCount));
+
+  for (var i = 0; i < byteCount; i++) {
+    var byteIndex = le ? i : Math.abs(i + 1 - bytes.length);
+    bytes[byteIndex] = Number(number / BYTE_TABLE[i] & BigInt(0xFF));
+
+    if (number < 0) {
+      bytes[byteIndex] = Math.abs(~bytes[byteIndex]);
+      bytes[byteIndex] -= i === 0 ? 1 : 2;
+    }
+  }
+
+  return bytes;
+};
+
+exports.numberToBytes = numberToBytes;
+
+var bytesToString = function bytesToString(bytes) {
+  if (!bytes) {
+    return '';
+  } // TODO: should toUint8 handle cases where we only have 8 bytes
+  // but report more since this is a Uint16+ Array?
+
+
+  bytes = Array.prototype.slice.call(bytes);
+  var string = String.fromCharCode.apply(null, toUint8(bytes));
+
+  try {
+    return decodeURIComponent(escape(string));
+  } catch (e) {// if decodeURIComponent/escape fails, we are dealing with partial
+    // or full non string data. Just return the potentially garbled string.
+  }
+
+  return string;
+};
+
+exports.bytesToString = bytesToString;
+
+var stringToBytes = function stringToBytes(string, stringIsBytes) {
+  if (typeof string !== 'string' && string && typeof string.toString === 'function') {
+    string = string.toString();
+  }
+
+  if (typeof string !== 'string') {
+    return new Uint8Array();
+  } // If the string already is bytes, we don't have to do this
+  // otherwise we do this so that we split multi length characters
+  // into individual bytes
+
+
+  if (!stringIsBytes) {
+    string = unescape(encodeURIComponent(string));
+  }
+
+  var view = new Uint8Array(string.length);
+
+  for (var i = 0; i < string.length; i++) {
+    view[i] = string.charCodeAt(i);
+  }
+
+  return view;
+};
+
+exports.stringToBytes = stringToBytes;
+
+var concatTypedArrays = function concatTypedArrays() {
+  for (var _len = arguments.length, buffers = new Array(_len), _key = 0; _key < _len; _key++) {
+    buffers[_key] = arguments[_key];
+  }
+
+  buffers = buffers.filter(function (b) {
+    return b && (b.byteLength || b.length) && typeof b !== 'string';
+  });
+
+  if (buffers.length <= 1) {
+    // for 0 length we will return empty uint8
+    // for 1 length we return the first uint8
+    return toUint8(buffers[0]);
+  }
+
+  var totalLen = buffers.reduce(function (total, buf, i) {
+    return total + (buf.byteLength || buf.length);
+  }, 0);
+  var tempBuffer = new Uint8Array(totalLen);
+  var offset = 0;
+  buffers.forEach(function (buf) {
+    buf = toUint8(buf);
+    tempBuffer.set(buf, offset);
+    offset += buf.byteLength;
+  });
+  return tempBuffer;
+};
+/**
+ * Check if the bytes "b" are contained within bytes "a".
+ *
+ * @param {Uint8Array|Array} a
+ *        Bytes to check in
+ *
+ * @param {Uint8Array|Array} b
+ *        Bytes to check for
+ *
+ * @param {Object} options
+ *        options
+ *
+ * @param {Array|Uint8Array} [offset=0]
+ *        offset to use when looking at bytes in a
+ *
+ * @param {Array|Uint8Array} [mask=[]]
+ *        mask to use on bytes before comparison.
+ *
+ * @return {boolean}
+ *         If all bytes in b are inside of a, taking into account
+ *         bit masks.
+ */
+
+
+exports.concatTypedArrays = concatTypedArrays;
+
+var bytesMatch = function bytesMatch(a, b, _temp3) {
+  var _ref3 = _temp3 === void 0 ? {} : _temp3,
+      _ref3$offset = _ref3.offset,
+      offset = _ref3$offset === void 0 ? 0 : _ref3$offset,
+      _ref3$mask = _ref3.mask,
+      mask = _ref3$mask === void 0 ? [] : _ref3$mask;
+
+  a = toUint8(a);
+  b = toUint8(b); // ie 11 does not support uint8 every
+
+  var fn = b.every ? b.every : Array.prototype.every;
+  return b.length && a.length - offset >= b.length && // ie 11 doesn't support every on uin8
+  fn.call(b, function (bByte, i) {
+    var aByte = mask[i] ? mask[i] & a[offset + i] : a[offset + i];
+    return bByte === aByte;
+  });
+};
+
+exports.bytesMatch = bytesMatch;
+
+var sliceBytes = function sliceBytes(src, start, end) {
+  if (Uint8Array.prototype.slice) {
+    return Uint8Array.prototype.slice.call(src, start, end);
+  }
+
+  return new Uint8Array(Array.prototype.slice.call(src, start, end));
+};
+
+exports.sliceBytes = sliceBytes;
+
+var reverseBytes = function reverseBytes(src) {
+  if (src.reverse) {
+    return src.reverse();
+  }
+
+  return Array.prototype.reverse.call(src);
+};
+
+exports.reverseBytes = reverseBytes;