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uint4

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uint4 - npm Package Compare versions

Comparing version

0.0.0
to
0.1.1

37

index.js

@@ -1,2 +0,2 @@

var readUInt4 = function(buffer, cursor) {
var readUInt4BE = function(buffer, cursor) {
if(cursor % 1)

@@ -8,3 +8,3 @@ return buffer.readUInt8(Math.floor(cursor)) & 15;

var writeUInt4 = function(buffer, value, cursor) {
var writeUInt4BE = function(buffer, value, cursor) {
if(value >= 16)

@@ -15,11 +15,32 @@ throw(new Error('value is out of bounds'));

if(cursor % 1) // Second half byte
buffer.writeUInt8((readUInt4(buffer, byteLoc) << 4 | value), byteLoc);
buffer.writeUInt8((readUInt4BE(buffer, byteLoc) << 4 | value), byteLoc);
else // First half byte
buffer.writeUInt8((value << 4 | readUInt4(buffer, cursor)), byteLoc);
buffer.writeUInt8((value << 4 | readUInt4BE(buffer, cursor)), byteLoc);
};
module.exports.read = readUInt4;
module.exports.readUInt4 = readUInt4;
var readUInt4LE = function(buffer, cursor) {
if(cursor % 1)
return buffer.readUInt8(Math.floor(cursor)) >> 4;
else
return buffer.readUInt8(cursor) & 15;
};
module.exports.write = writeUInt4;
module.exports.writeUInt4 = writeUInt4;
var writeUInt4LE = function(buffer, value, cursor) {
if(value >= 16)
throw(new Error('value is out of bounds'));
var byteLoc = Math.floor(cursor);
if(cursor % 1)
buffer.writeUInt8((value << 4 | readUInt4LE(buffer, Math.floor(cursor))), byteLoc);
else
buffer.writeUInt8((readUInt4LE(buffer, byteLoc) << 4 | value), byteLoc);
};
module.exports.read = readUInt4BE;
module.exports.readUInt4 = readUInt4BE;
module.exports.write = writeUInt4BE;
module.exports.writeUInt4 = writeUInt4BE;
module.exports.readUInt4BE = readUInt4BE;
module.exports.writeUInt4BE = writeUInt4BE;
module.exports.readUInt4LE = readUInt4LE;
module.exports.writeUInt4LE = writeUInt4LE;

2

package.json
{
"name": "uint4",
"version": "0.0.0",
"version": "0.1.1",
"description": "Read and write half-bytes to buffers",

@@ -5,0 +5,0 @@ "main": "index.js",

92

test/test.js
var assert = require('assert');
describe('UInt4', function() {
describe('uint4', function() {
var readUInt4 = require('../index.js').readUInt4;
var writeUInt4 = require('../index.js').writeUInt4;
var uint4 = require('../index.js');
describe('#read(buffer, cursor)', function() {
describe('#readUInt4BE(buffer, cursor)', function() {

@@ -17,10 +16,10 @@ it('should read half a byte', function() {

assert.equal(0x03, readUInt4(buf, 0.0));
assert.equal(0x05, readUInt4(buf, 0.5));
assert.equal(0x00, readUInt4(buf, 1.0));
assert.equal(0x01, readUInt4(buf, 1.5));
assert.equal(0x01, readUInt4(buf, 2.0));
assert.equal(0x00, readUInt4(buf, 2.5));
assert.equal(0x0f, readUInt4(buf, 3.0));
assert.equal(0x0f, readUInt4(buf, 3.5));
assert.equal(0x03, uint4.readUInt4BE(buf, 0.0));
assert.equal(0x05, uint4.readUInt4BE(buf, 0.5));
assert.equal(0x00, uint4.readUInt4BE(buf, 1.0));
assert.equal(0x01, uint4.readUInt4BE(buf, 1.5));
assert.equal(0x01, uint4.readUInt4BE(buf, 2.0));
assert.equal(0x00, uint4.readUInt4BE(buf, 2.5));
assert.equal(0x0f, uint4.readUInt4BE(buf, 3.0));
assert.equal(0x0f, uint4.readUInt4BE(buf, 3.5));
});

@@ -30,3 +29,3 @@

describe('#write(buffer, value, cursor)', function() {
describe('#writeUInt4BE(buffer, value, cursor)', function() {

@@ -36,10 +35,10 @@ it('should write half a byte', function() {

writeUInt4(buf, 0x03, 0.0);
writeUInt4(buf, 0x05, 0.5);
writeUInt4(buf, 0x00, 1.0);
writeUInt4(buf, 0x01, 1.5);
writeUInt4(buf, 0x01, 2.0);
writeUInt4(buf, 0x00, 2.5);
writeUInt4(buf, 0x0f, 3.0);
writeUInt4(buf, 0x0f, 3.5);
uint4.writeUInt4BE(buf, 0x03, 0.0);
uint4.writeUInt4BE(buf, 0x05, 0.5);
uint4.writeUInt4BE(buf, 0x00, 1.0);
uint4.writeUInt4BE(buf, 0x01, 1.5);
uint4.writeUInt4BE(buf, 0x01, 2.0);
uint4.writeUInt4BE(buf, 0x00, 2.5);
uint4.writeUInt4BE(buf, 0x0f, 3.0);
uint4.writeUInt4BE(buf, 0x0f, 3.5);

@@ -62,2 +61,53 @@ assert.equal(0x35, buf[0]);

describe('#readUInt4LE(buffer, cursor)', function() {
it('should read half a byte', function() {
var buf = new Buffer(4);
buf[0] = 0x53;
buf[1] = 0x10;
buf[2] = 0x01;
buf[3] = 0xff;
assert.equal(0x03, uint4.readUInt4LE(buf, 0.0));
assert.equal(0x05, uint4.readUInt4LE(buf, 0.5));
assert.equal(0x00, uint4.readUInt4LE(buf, 1.0));
assert.equal(0x01, uint4.readUInt4LE(buf, 1.5));
assert.equal(0x01, uint4.readUInt4LE(buf, 2.0));
assert.equal(0x00, uint4.readUInt4LE(buf, 2.5));
assert.equal(0x0f, uint4.readUInt4LE(buf, 3.0));
assert.equal(0x0f, uint4.readUInt4LE(buf, 3.5));
});
});
describe('#writeUInt4LE(buffer, value, cursor)', function() {
it('should write half a byte', function() {
var buf = new Buffer(4);
uint4.writeUInt4LE(buf, 0x03, 0.0);
uint4.writeUInt4LE(buf, 0x05, 0.5);
uint4.writeUInt4LE(buf, 0x00, 1.0);
uint4.writeUInt4LE(buf, 0x01, 1.5);
uint4.writeUInt4LE(buf, 0x01, 2.0);
uint4.writeUInt4LE(buf, 0x00, 2.5);
uint4.writeUInt4LE(buf, 0x0f, 3.0);
uint4.writeUInt4LE(buf, 0x0f, 3.5);
assert.equal(0x53, buf[0]);
assert.equal(0x10, buf[1]);
assert.equal(0x01, buf[2]);
assert.equal(0xff, buf[3]);
});
it('should throw when given values >= 16', function() {
var buf = new Buffer(4);
assert.throws(function() {
writeUInt4LE(buf, 20, 0);
});
});
});
});