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'use strict';
/*
* A battery of tests to help us read a series of uints
*/
require('../common');
const assert = require('assert');
/*
* We need to check the following things:
* - We are correctly resolving big endian (doesn't mean anything for 8 bit)
* - Correctly resolving little endian (doesn't mean anything for 8 bit)
* - Correctly using the offsets
* - Correctly interpreting values that are beyond the signed range as unsigned
*/
function test8(clazz) {
const data = new clazz(4);
data.writeUInt8(23, 0);
data.writeUInt8(23, 1);
data.writeUInt8(23, 2);
data.writeUInt8(23, 3);
assert.strictEqual(23, data[0]);
assert.strictEqual(23, data[1]);
assert.strictEqual(23, data[2]);
assert.strictEqual(23, data[3]);
data.writeUInt8(23, 0);
data.writeUInt8(23, 1);
data.writeUInt8(23, 2);
data.writeUInt8(23, 3);
assert.strictEqual(23, data[0]);
assert.strictEqual(23, data[1]);
assert.strictEqual(23, data[2]);
assert.strictEqual(23, data[3]);
data.writeUInt8(255, 0);
assert.strictEqual(255, data[0]);
data.writeUInt8(255, 0);
assert.strictEqual(255, data[0]);
}
function test16(clazz) {
let value = 0x2343;
const data = new clazz(4);
data.writeUInt16BE(value, 0);
assert.strictEqual(0x23, data[0]);
assert.strictEqual(0x43, data[1]);
data.writeUInt16BE(value, 1);
assert.strictEqual(0x23, data[1]);
assert.strictEqual(0x43, data[2]);
data.writeUInt16BE(value, 2);
assert.strictEqual(0x23, data[2]);
assert.strictEqual(0x43, data[3]);
data.writeUInt16LE(value, 0);
assert.strictEqual(0x23, data[1]);
assert.strictEqual(0x43, data[0]);
data.writeUInt16LE(value, 1);
assert.strictEqual(0x23, data[2]);
assert.strictEqual(0x43, data[1]);
data.writeUInt16LE(value, 2);
assert.strictEqual(0x23, data[3]);
assert.strictEqual(0x43, data[2]);
value = 0xff80;
data.writeUInt16LE(value, 0);
assert.strictEqual(0xff, data[1]);
assert.strictEqual(0x80, data[0]);
data.writeUInt16BE(value, 0);
assert.strictEqual(0xff, data[0]);
assert.strictEqual(0x80, data[1]);
}
function test32(clazz) {
const data = new clazz(6);
const value = 0xe7f90a6d;
data.writeUInt32BE(value, 0);
assert.strictEqual(0xe7, data[0]);
assert.strictEqual(0xf9, data[1]);
assert.strictEqual(0x0a, data[2]);
assert.strictEqual(0x6d, data[3]);
data.writeUInt32BE(value, 1);
assert.strictEqual(0xe7, data[1]);
assert.strictEqual(0xf9, data[2]);
assert.strictEqual(0x0a, data[3]);
assert.strictEqual(0x6d, data[4]);
data.writeUInt32BE(value, 2);
assert.strictEqual(0xe7, data[2]);
assert.strictEqual(0xf9, data[3]);
assert.strictEqual(0x0a, data[4]);
assert.strictEqual(0x6d, data[5]);
data.writeUInt32LE(value, 0);
assert.strictEqual(0xe7, data[3]);
assert.strictEqual(0xf9, data[2]);
assert.strictEqual(0x0a, data[1]);
assert.strictEqual(0x6d, data[0]);
data.writeUInt32LE(value, 1);
assert.strictEqual(0xe7, data[4]);
assert.strictEqual(0xf9, data[3]);
assert.strictEqual(0x0a, data[2]);
assert.strictEqual(0x6d, data[1]);
data.writeUInt32LE(value, 2);
assert.strictEqual(0xe7, data[5]);
assert.strictEqual(0xf9, data[4]);
assert.strictEqual(0x0a, data[3]);
assert.strictEqual(0x6d, data[2]);
}
function testUint(clazz) {
const data = new clazz(8);
let val = 1;
// Test 0 to 5 bytes.
for (let i = 0; i <= 5; i++) {
const errmsg = `byteLength: ${i}`;
assert.throws(function() {
data.writeUIntBE(val, 0, i);
}, /"value" argument is out of bounds/, errmsg);
assert.throws(function() {
data.writeUIntLE(val, 0, i);
}, /"value" argument is out of bounds/, errmsg);
val *= 0x100;
}
}
test8(Buffer);
test16(Buffer);
test32(Buffer);
testUint(Buffer);
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