buffer: refactor all read/write functions

There are a lot of changes in this commit:

1) Remove the `noAssert` argument from all read and write functions.
2) Improve the performance of all read floating point functions
   significantly. This is done by switching to TypedArrays as the
   write floating point write functions.
3) No implicit type coercion for offset and byteLength anymore.
4) Adds a lot of tests.
5) Moves the read and write functions to the internal buffer file
   to split the files in smaller chunks.
6) Reworked a lot of existing tests.
7) Improve the performane of all all read write functions by using
   a faster input validation and by improving function logic.
8) Significantly improved the performance of all read int functions.
   This is done by using a implementation without a loop.
9) Improved error handling.
10) Rename test file to use the correct subsystem.

PR-URL: nodejs#18395
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

test/parallel/test-buffer-arraybuffer.js

@@ -42,13 +42,6 @@ assert.throws(function() {
   Buffer.from(new AB());
 }, TypeError);
 
-// write{Double,Float}{LE,BE} with noAssert should not crash, cf. #3766
-const 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
 {
   const ab = new Uint8Array(5);

test/parallel/test-buffer-read.js

@@ -6,16 +6,11 @@ const assert = require('assert');
 const buf = Buffer.from([0xa4, 0xfd, 0x48, 0xea, 0xcf, 0xff, 0xd9, 0x01, 0xde]);
 
 function read(buff, funx, args, expected) {
-
   assert.strictEqual(buff[funx](...args), expected);
   common.expectsError(
     () => buff[funx](-1, args[1]),
-    {
-      code: 'ERR_INDEX_OUT_OF_RANGE'
-    }
+    { code: 'ERR_OUT_OF_RANGE' }
   );
-
-  assert.strictEqual(buff[funx](...args, true), expected);
 }
 
 // testing basic functionality of readDoubleBE() and readDoubleLE()
@@ -123,7 +118,7 @@ assert.throws(() => Buffer.allocUnsafe(8).readFloatLE(-1), RangeError);
                      (0xFFFFFFFF >> (32 - bits)));
 });
 
-// test for common read(U)IntLE/BE
+// Test for common read(U)IntLE/BE
 {
   const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06]);
 
@@ -144,19 +139,3 @@ assert.throws(() => Buffer.allocUnsafe(8).readFloatLE(-1), RangeError);
   assert.strictEqual(buf.readIntLE(0, 6), 0x060504030201);
   assert.strictEqual(buf.readIntBE(0, 6), 0x010203040506);
 }
-
-// test for byteLength parameter not between 1 and 6 (inclusive)
-common.expectsError(() => { buf.readIntLE(1); }, { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntLE(1, 'string'); },
-                    { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntLE(1, 0); },
-                    { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntLE(1, 7); },
-                    { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntBE(1); }, { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntBE(1, 'string'); },
-                    { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntBE(1, 0); },
-                    { code: 'ERR_OUT_OF_RANGE' });
-common.expectsError(() => { buf.readIntBE(1, 7); },
-                    { code: 'ERR_OUT_OF_RANGE' });

test/parallel/test-buffer-readdouble.js

@@ -0,0 +1,138 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+// Test (64 bit) double
+const buffer = Buffer.allocUnsafe(8);
+
+buffer[0] = 0x55;
+buffer[1] = 0x55;
+buffer[2] = 0x55;
+buffer[3] = 0x55;
+buffer[4] = 0x55;
+buffer[5] = 0x55;
+buffer[6] = 0xd5;
+buffer[7] = 0x3f;
+assert.strictEqual(buffer.readDoubleBE(0), 1.1945305291680097e+103);
+assert.strictEqual(buffer.readDoubleLE(0), 0.3333333333333333);
+
+buffer[0] = 1;
+buffer[1] = 0;
+buffer[2] = 0;
+buffer[3] = 0;
+buffer[4] = 0;
+buffer[5] = 0;
+buffer[6] = 0xf0;
+buffer[7] = 0x3f;
+assert.strictEqual(buffer.readDoubleBE(0), 7.291122019655968e-304);
+assert.strictEqual(buffer.readDoubleLE(0), 1.0000000000000002);
+
+buffer[0] = 2;
+assert.strictEqual(buffer.readDoubleBE(0), 4.778309726801735e-299);
+assert.strictEqual(buffer.readDoubleLE(0), 1.0000000000000004);
+
+buffer[0] = 1;
+buffer[6] = 0;
+buffer[7] = 0;
+assert.strictEqual(buffer.readDoubleBE(0), 7.291122019556398e-304);
+assert.strictEqual(buffer.readDoubleLE(0), 5e-324);
+
+buffer[0] = 0xff;
+buffer[1] = 0xff;
+buffer[2] = 0xff;
+buffer[3] = 0xff;
+buffer[4] = 0xff;
+buffer[5] = 0xff;
+buffer[6] = 0x0f;
+buffer[7] = 0x00;
+assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
+assert.strictEqual(buffer.readDoubleLE(0), 2.225073858507201e-308);
+
+buffer[6] = 0xef;
+buffer[7] = 0x7f;
+assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
+assert.strictEqual(buffer.readDoubleLE(0), 1.7976931348623157e+308);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0;
+buffer[3] = 0;
+buffer[4] = 0;
+buffer[5] = 0;
+buffer[6] = 0xf0;
+buffer[7] = 0x3f;
+assert.strictEqual(buffer.readDoubleBE(0), 3.03865e-319);
+assert.strictEqual(buffer.readDoubleLE(0), 1);
+
+buffer[6] = 0;
+buffer[7] = 0x40;
+assert.strictEqual(buffer.readDoubleBE(0), 3.16e-322);
+assert.strictEqual(buffer.readDoubleLE(0), 2);
+
+buffer[7] = 0xc0;
+assert.strictEqual(buffer.readDoubleBE(0), 9.5e-322);
+assert.strictEqual(buffer.readDoubleLE(0), -2);
+
+buffer[6] = 0x10;
+buffer[7] = 0;
+assert.strictEqual(buffer.readDoubleBE(0), 2.0237e-320);
+assert.strictEqual(buffer.readDoubleLE(0), 2.2250738585072014e-308);
+
+buffer[6] = 0;
+assert.strictEqual(buffer.readDoubleBE(0), 0);
+assert.strictEqual(buffer.readDoubleLE(0), 0);
+assert.ok(1 / buffer.readDoubleLE(0) >= 0);
+
+buffer[7] = 0x80;
+assert.strictEqual(buffer.readDoubleBE(0), 6.3e-322);
+assert.strictEqual(buffer.readDoubleLE(0), -0);
+assert.ok(1 / buffer.readDoubleLE(0) < 0);
+
+buffer[6] = 0xf0;
+buffer[7] = 0x7f;
+assert.strictEqual(buffer.readDoubleBE(0), 3.0418e-319);
+assert.strictEqual(buffer.readDoubleLE(0), Infinity);
+
+buffer[7] = 0xff;
+assert.strictEqual(buffer.readDoubleBE(0), 3.04814e-319);
+assert.strictEqual(buffer.readDoubleLE(0), -Infinity);
+
+['readDoubleLE', 'readDoubleBE'].forEach((fn) => {
+  ['', '0', null, undefined, {}, [], () => {}, true, false].forEach((off) => {
+    assert.throws(
+      () => buffer[fn](off),
+      { code: 'ERR_INVALID_ARG_TYPE' }
+    );
+  });
+
+  [Infinity, -1, 1].forEach((offset) => {
+    assert.throws(
+      () => buffer[fn](offset),
+      {
+        code: 'ERR_OUT_OF_RANGE',
+        name: 'RangeError [ERR_OUT_OF_RANGE]',
+        message: 'The value of "offset" is out of range. ' +
+                 `It must be >= 0 and <= 0. Received ${offset}`
+      });
+  });
+
+  assert.throws(
+    () => Buffer.alloc(1)[fn](1),
+    {
+      code: 'ERR_BUFFER_OUT_OF_BOUNDS',
+      name: 'RangeError [ERR_BUFFER_OUT_OF_BOUNDS]',
+      message: 'Attempt to write outside buffer bounds'
+    });
+
+  [NaN, 1.01].forEach((offset) => {
+    assert.throws(
+      () => buffer[fn](offset),
+      {
+        code: 'ERR_OUT_OF_RANGE',
+        name: 'RangeError [ERR_OUT_OF_RANGE]',
+        message: 'The value of "offset" is out of range. ' +
+                 `It must be an integer. Received ${offset}`
+      });
+  });
+});

test/parallel/test-buffer-readfloat.js

@@ -0,0 +1,101 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+// Test 32 bit float
+const buffer = Buffer.alloc(4);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0x80;
+buffer[3] = 0x3f;
+assert.strictEqual(buffer.readFloatBE(0), 4.600602988224807e-41);
+assert.strictEqual(buffer.readFloatLE(0), 1);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0;
+buffer[3] = 0xc0;
+assert.strictEqual(buffer.readFloatBE(0), 2.6904930515036488e-43);
+assert.strictEqual(buffer.readFloatLE(0), -2);
+
+buffer[0] = 0xff;
+buffer[1] = 0xff;
+buffer[2] = 0x7f;
+buffer[3] = 0x7f;
+assert.ok(Number.isNaN(buffer.readFloatBE(0)));
+assert.strictEqual(buffer.readFloatLE(0), 3.4028234663852886e+38);
+
+buffer[0] = 0xab;
+buffer[1] = 0xaa;
+buffer[2] = 0xaa;
+buffer[3] = 0x3e;
+assert.strictEqual(buffer.readFloatBE(0), -1.2126478207002966e-12);
+assert.strictEqual(buffer.readFloatLE(0), 0.3333333432674408);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0;
+buffer[3] = 0;
+assert.strictEqual(buffer.readFloatBE(0), 0);
+assert.strictEqual(buffer.readFloatLE(0), 0);
+assert.ok(1 / buffer.readFloatLE(0) >= 0);
+
+buffer[3] = 0x80;
+assert.strictEqual(buffer.readFloatBE(0), 1.793662034335766e-43);
+assert.strictEqual(buffer.readFloatLE(0), -0);
+assert.ok(1 / buffer.readFloatLE(0) < 0);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0x80;
+buffer[3] = 0x7f;
+assert.strictEqual(buffer.readFloatBE(0), 4.609571298396486e-41);
+assert.strictEqual(buffer.readFloatLE(0), Infinity);
+
+buffer[0] = 0;
+buffer[1] = 0;
+buffer[2] = 0x80;
+buffer[3] = 0xff;
+assert.strictEqual(buffer.readFloatBE(0), 4.627507918739843e-41);
+assert.strictEqual(buffer.readFloatLE(0), -Infinity);
+
+['readFloatLE', 'readFloatBE'].forEach((fn) => {
+  ['', '0', null, undefined, {}, [], () => {}, true, false].forEach((off) => {
+    assert.throws(
+      () => buffer[fn](off),
+      { code: 'ERR_INVALID_ARG_TYPE' }
+    );
+  });
+
+  [Infinity, -1, 1].forEach((offset) => {
+    assert.throws(
+      () => buffer[fn](offset),
+      {
+        code: 'ERR_OUT_OF_RANGE',
+        name: 'RangeError [ERR_OUT_OF_RANGE]',
+        message: 'The value of "offset" is out of range. ' +
+                 `It must be >= 0 and <= 0. Received ${offset}`
+      });
+  });
+
+  assert.throws(
+    () => Buffer.alloc(1)[fn](1),
+    {
+      code: 'ERR_BUFFER_OUT_OF_BOUNDS',
+      name: 'RangeError [ERR_BUFFER_OUT_OF_BOUNDS]',
+      message: 'Attempt to write outside buffer bounds'
+    });
+
+  [NaN, 1.01].forEach((offset) => {
+    assert.throws(
+      () => buffer[fn](offset),
+      {
+        code: 'ERR_OUT_OF_RANGE',
+        name: 'RangeError [ERR_OUT_OF_RANGE]',
+        message: 'The value of "offset" is out of range. ' +
+                 `It must be an integer. Received ${offset}`
+      });
+  });
+});