sdfsdfs

node_modules/buffer/test/node/test-buffer-arraybuffer.js

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+'use strict';
+var Buffer = require('../../').Buffer;
+
+
+
+var assert = require('assert');
+
+var Buffer = require('../../').Buffer;
+var LENGTH = 16;
+
+var ab = new ArrayBuffer(LENGTH);
+var dv = new DataView(ab);
+var ui = new Uint8Array(ab);
+var buf = Buffer.from(ab);
+
+
+assert.ok(buf instanceof Buffer);
+// For backwards compatibility of old .parent property test that if buf is not
+// a slice then .parent should be undefined.
+assert.equal(buf.parent, undefined);
+assert.equal(buf.buffer, ab);
+assert.equal(buf.length, ab.byteLength);
+
+
+buf.fill(0xC);
+for (var i = 0; i < LENGTH; i++) {
+  assert.equal(ui[i], 0xC);
+  ui[i] = 0xF;
+  assert.equal(buf[i], 0xF);
+}
+
+buf.writeUInt32LE(0xF00, 0);
+buf.writeUInt32BE(0xB47, 4);
+buf.writeDoubleLE(3.1415, 8);
+
+assert.equal(dv.getUint32(0, true), 0xF00);
+assert.equal(dv.getUint32(4), 0xB47);
+assert.equal(dv.getFloat64(8, true), 3.1415);
+
+
+// Now test protecting users from doing stupid things
+
+assert.throws(function() {
+  function AB() { }
+  Object.setPrototypeOf(AB, ArrayBuffer);
+  Object.setPrototypeOf(AB.prototype, ArrayBuffer.prototype);
+  Buffer.from(new AB());
+}, TypeError);
+
+// write{Double,Float}{LE,BE} with noAssert should not crash, cf. #3766
+var b = Buffer.allocUnsafe(1);
+b.writeFloatLE(11.11, 0, true);
+b.writeFloatBE(11.11, 0, true);
+b.writeDoubleLE(11.11, 0, true);
+b.writeDoubleBE(11.11, 0, true);
+
+// Test the byteOffset and length arguments
+{
+  var ab = new Uint8Array(5);
+  ab[0] = 1;
+  ab[1] = 2;
+  ab[2] = 3;
+  ab[3] = 4;
+  ab[4] = 5;
+  var buf = Buffer.from(ab.buffer, 1, 3);
+  assert.equal(buf.length, 3);
+  assert.equal(buf[0], 2);
+  assert.equal(buf[1], 3);
+  assert.equal(buf[2], 4);
+  buf[0] = 9;
+  assert.equal(ab[1], 9);
+
+  assert.throws(() => Buffer.from(ab.buffer, 6), (err) => {
+    assert(err instanceof RangeError);
+    assert(/'offset' is out of bounds/.test(err.message));
+    return true;
+  });
+  assert.throws(() => Buffer.from(ab.buffer, 3, 6), (err) => {
+    assert(err instanceof RangeError);
+    assert(/'length' is out of bounds/.test(err.message));
+    return true;
+  });
+}
+
+// Test the deprecated Buffer() version also
+{
+  var ab = new Uint8Array(5);
+  ab[0] = 1;
+  ab[1] = 2;
+  ab[2] = 3;
+  ab[3] = 4;
+  ab[4] = 5;
+  var buf = Buffer(ab.buffer, 1, 3);
+  assert.equal(buf.length, 3);
+  assert.equal(buf[0], 2);
+  assert.equal(buf[1], 3);
+  assert.equal(buf[2], 4);
+  buf[0] = 9;
+  assert.equal(ab[1], 9);
+
+  assert.throws(() => Buffer(ab.buffer, 6), (err) => {
+    assert(err instanceof RangeError);
+    assert(/'offset' is out of bounds/.test(err.message));
+    return true;
+  });
+  assert.throws(() => Buffer(ab.buffer, 3, 6), (err) => {
+    assert(err instanceof RangeError);
+    assert(/'length' is out of bounds/.test(err.message));
+    return true;
+  });
+}
+