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'use strict';
// Tests to verify floats are correctly written
require('../common');
const assert = require('assert');
const buffer = Buffer.allocUnsafe(8);
buffer.writeFloatBE(1, 0);
buffer.writeFloatLE(1, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x3f, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0x3f ])));
buffer.writeFloatBE(1 / 3, 0);
buffer.writeFloatLE(1 / 3, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x3e, 0xaa, 0xaa, 0xab, 0xab, 0xaa, 0xaa, 0x3e ])));
buffer.writeFloatBE(3.4028234663852886e+38, 0);
buffer.writeFloatLE(3.4028234663852886e+38, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x7f, 0x7f, 0xff, 0xff, 0xff, 0xff, 0x7f, 0x7f ])));
buffer.writeFloatLE(1.1754943508222875e-38, 0);
buffer.writeFloatBE(1.1754943508222875e-38, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x00, 0x00, 0x80, 0x00, 0x00, 0x80, 0x00, 0x00 ])));
buffer.writeFloatBE(0 * -1, 0);
buffer.writeFloatLE(0 * -1, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80 ])));
buffer.writeFloatBE(Infinity, 0);
buffer.writeFloatLE(Infinity, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0x7F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0x7F ])));
assert.strictEqual(buffer.readFloatBE(0), Infinity);
assert.strictEqual(buffer.readFloatLE(4), Infinity);
buffer.writeFloatBE(-Infinity, 0);
buffer.writeFloatLE(-Infinity, 4);
assert.ok(buffer.equals(
new Uint8Array([ 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0xFF ])));
assert.strictEqual(buffer.readFloatBE(0), -Infinity);
assert.strictEqual(buffer.readFloatLE(4), -Infinity);
buffer.writeFloatBE(NaN, 0);
buffer.writeFloatLE(NaN, 4);
// JS only knows a single NaN but there exist two platform specific
// implementations. Therefore, allow both quiet and signalling NaNs.
if (buffer[1] === 0xBF) {
assert.ok(
buffer.equals(new Uint8Array(
[ 0x7F, 0xBF, 0xFF, 0xFF, 0xFF, 0xFF, 0xBF, 0x7F ])));
} else {
assert.ok(
buffer.equals(new Uint8Array(
[ 0x7F, 0xC0, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x7F ])));
}
assert.ok(Number.isNaN(buffer.readFloatBE(0)));
assert.ok(Number.isNaN(buffer.readFloatLE(4)));
// OOB in writeFloat{LE,BE} should throw.
{
const small = Buffer.allocUnsafe(1);
['writeFloatLE', 'writeFloatBE'].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, 5].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 <= 4. 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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