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'use strict';
// Tests to verify doubles are correctly written
require('../common');
const assert = require('assert');
const buffer = Buffer.allocUnsafe(16);
buffer.writeDoubleBE(2.225073858507201e-308, 0);
buffer.writeDoubleLE(2.225073858507201e-308, 8);
assert.ok(buffer.equals(new Uint8Array([
0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f, 0x00,
])));
buffer.writeDoubleBE(1.0000000000000004, 0);
buffer.writeDoubleLE(1.0000000000000004, 8);
assert.ok(buffer.equals(new Uint8Array([
0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,
])));
buffer.writeDoubleBE(-2, 0);
buffer.writeDoubleLE(-2, 8);
assert.ok(buffer.equals(new Uint8Array([
0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0,
])));
buffer.writeDoubleBE(1.7976931348623157e+308, 0);
buffer.writeDoubleLE(1.7976931348623157e+308, 8);
assert.ok(buffer.equals(new Uint8Array([
0x7f, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0x7f,
])));
buffer.writeDoubleBE(0 * -1, 0);
buffer.writeDoubleLE(0 * -1, 8);
assert.ok(buffer.equals(new Uint8Array([
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
])));
buffer.writeDoubleBE(Infinity, 0);
buffer.writeDoubleLE(Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x7F,
])));
assert.strictEqual(buffer.readDoubleBE(0), Infinity);
assert.strictEqual(buffer.readDoubleLE(8), Infinity);
buffer.writeDoubleBE(-Infinity, 0);
buffer.writeDoubleLE(-Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([
0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xFF,
])));
assert.strictEqual(buffer.readDoubleBE(0), -Infinity);
assert.strictEqual(buffer.readDoubleLE(8), -Infinity);
buffer.writeDoubleBE(NaN, 0);
buffer.writeDoubleLE(NaN, 8);
// JS only knows a single NaN but there exist two platform specific
// implementations. Therefore, allow both quiet and signalling NaNs.
if (buffer[1] === 0xF7) {
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0x7F,
])));
} else {
assert.ok(buffer.equals(new Uint8Array([
0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x7F,
])));
}
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.ok(Number.isNaN(buffer.readDoubleLE(8)));
// OOB in writeDouble{LE,BE} should throw.
{
const small = Buffer.allocUnsafe(1);
['writeDoubleLE', 'writeDoubleBE'].forEach((fn) => {
// Verify that default offset works fine.
buffer[fn](23, undefined);
buffer[fn](23);
assert.throws(
() => small[fn](11.11, 0),
{
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
name: 'RangeError',
message: 'Attempt to access memory outside buffer bounds'
});
['', '0', null, {}, [], () => {}, true, false].forEach((off) => {
assert.throws(
() => small[fn](23, off),
{ code: 'ERR_INVALID_ARG_TYPE' });
});
[Infinity, -1, 9].forEach((offset) => {
assert.throws(
() => buffer[fn](23, offset),
{
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "offset" is out of range. ' +
`It must be >= 0 and <= 8. Received ${offset}`
});
});
[NaN, 1.01].forEach((offset) => {
assert.throws(
() => buffer[fn](42, offset),
{
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "offset" is out of range. ' +
`It must be an integer. Received ${offset}`
});
});
});
}
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