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test-writeuint.js
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test-writeuint.js
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/*
* A battery of tests to help us read a series of uints
*/
var 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() {
var data = new Buffer(4);
data.writeUInt8(23, 0, 'big');
data.writeUInt8(23, 1, 'big');
data.writeUInt8(23, 2, 'big');
data.writeUInt8(23, 3, 'big');
ASSERT.equal(23, data[0]);
ASSERT.equal(23, data[1]);
ASSERT.equal(23, data[2]);
ASSERT.equal(23, data[3]);
data.writeUInt8(23, 0, 'little');
data.writeUInt8(23, 1, 'little');
data.writeUInt8(23, 2, 'little');
data.writeUInt8(23, 3, 'little');
ASSERT.equal(23, data[0]);
ASSERT.equal(23, data[1]);
ASSERT.equal(23, data[2]);
ASSERT.equal(23, data[3]);
data.writeUInt8(255, 0, 'big');
ASSERT.equal(255, data[0]);
data.writeUInt8(255, 0, 'little');
ASSERT.equal(255, data[0]);
}
function test16() {
var value = 0x2343;
var data = new Buffer(4);
data.writeUInt16(value, 0, 'big');
ASSERT.equal(0x23, data[0]);
ASSERT.equal(0x43, data[1]);
data.writeUInt16(value, 1, 'big');
ASSERT.equal(0x23, data[1]);
ASSERT.equal(0x43, data[2]);
data.writeUInt16(value, 2, 'big');
ASSERT.equal(0x23, data[2]);
ASSERT.equal(0x43, data[3]);
data.writeUInt16(value, 0, 'little');
ASSERT.equal(0x23, data[1]);
ASSERT.equal(0x43, data[0]);
data.writeUInt16(value, 1, 'little');
ASSERT.equal(0x23, data[2]);
ASSERT.equal(0x43, data[1]);
data.writeUInt16(value, 2, 'little');
ASSERT.equal(0x23, data[3]);
ASSERT.equal(0x43, data[2]);
value = 0xff80;
data.writeUInt16(value, 0, 'little');
ASSERT.equal(0xff, data[1]);
ASSERT.equal(0x80, data[0]);
data.writeUInt16(value, 0, 'big');
ASSERT.equal(0xff, data[0]);
ASSERT.equal(0x80, data[1]);
}
function test32() {
var data = new Buffer(6);
var value = 0xe7f90a6d;
data.writeUInt32(value, 0, 'big');
ASSERT.equal(0xe7, data[0]);
ASSERT.equal(0xf9, data[1]);
ASSERT.equal(0x0a, data[2]);
ASSERT.equal(0x6d, data[3]);
data.writeUInt32(value, 1, 'big');
ASSERT.equal(0xe7, data[1]);
ASSERT.equal(0xf9, data[2]);
ASSERT.equal(0x0a, data[3]);
ASSERT.equal(0x6d, data[4]);
data.writeUInt32(value, 2, 'big');
ASSERT.equal(0xe7, data[2]);
ASSERT.equal(0xf9, data[3]);
ASSERT.equal(0x0a, data[4]);
ASSERT.equal(0x6d, data[5]);
data.writeUInt32(value, 0, 'little');
ASSERT.equal(0xe7, data[3]);
ASSERT.equal(0xf9, data[2]);
ASSERT.equal(0x0a, data[1]);
ASSERT.equal(0x6d, data[0]);
data.writeUInt32(value, 1, 'little');
ASSERT.equal(0xe7, data[4]);
ASSERT.equal(0xf9, data[3]);
ASSERT.equal(0x0a, data[2]);
ASSERT.equal(0x6d, data[1]);
data.writeUInt32(value, 2, 'little');
ASSERT.equal(0xe7, data[5]);
ASSERT.equal(0xf9, data[4]);
ASSERT.equal(0x0a, data[3]);
ASSERT.equal(0x6d, data[2]);
}
test8();
test16();
test32();