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[dev] Add convertion for FP16. #6

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[dev] Add convertion for FP16. #6

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24 changes: 24 additions & 0 deletions baseconvert.com/ieee-754-floating-point.html
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@ <h1>Base Convert: IEEE 754 Floating Point</h1>

<div class="conversions" ng-controller="ConversionController" is-human="track('human')">
<div ng-repeat="group in getBaseGroups()" class="js-only">
<h2 ng-if="group[0].group === '16'">16 bit &ndash; half</h2>
<h2 ng-if="group[0].group === '32'">32 bit &ndash; float</h2>
<h2 ng-if="group[0].group === '64'">64 bit &ndash; double</h2>
<div
Expand Down Expand Up @@ -101,6 +102,29 @@ <h2 ng-if="group[0].group === '64'">64 bit &ndash; double</h2>
</label>
</div>

<h2>16 bit &ndash; half</h2>

<div class="form-group base">
<label class="input-group">
<div class="input-group-addon">Decimal <small class="hidden-xs">(exact)</small></div>
<input class="form-control" readonly>
</label>
</div>

<div class="form-group base">
<label class="input-group">
<div class="input-group-addon">Binary</div>
<input class="form-control">
</label>
</div>

<div class="form-group base">
<label class="input-group">
<div class="input-group-addon">Hexadecimal</div>
<input class="form-control">
</label>
</div>

<h2>32 bit &ndash; float</h2>

<div class="form-group base">
Expand Down
17 changes: 17 additions & 0 deletions baseconvert.com/js/converter-init-ieee-754.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,23 @@ var initialBases = [
name: 'decimal',
group: 'dec',
},
{
id: 'dec16',
name: 'decimal',
explanation: 'exact',
group: '16',
readonly: true,
},
{
id: 'bin16',
name: 'binary',
group: '16',
},
{
id: 'hex16',
name: 'hexadecimal',
group: '16',
},
{
id: 'dec32',
name: 'decimal',
Expand Down
27 changes: 24 additions & 3 deletions src/ieee-754.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,13 @@ function extIeee754() {
return new DataView(arr.buffer);
}

function numberToArr16(number) {
var arr = new Uint8Array(2);
var view = new DataView(arr.buffer);
view.setFloat16(0, +number);
return arr;
}

function numberToArr32(number) {
var arr = new Uint8Array(4);
var view = new DataView(arr.buffer);
Expand All @@ -53,7 +60,7 @@ function extIeee754() {

function getExactDec(number) {
return (
number === 0 && 1/number < 0
number === 0 && 1 / number < 0
? '-0'
: new converter.Big(
number.toString(16),
Expand All @@ -64,18 +71,22 @@ function extIeee754() {

function valid(base, number) {
if (number === undefined) {
return base === 'dec' || /^(dec|bin|hex)(32|64)$/.test(base);
return base === 'dec' || /^(dec|bin|hex)(16|32|64)$/.test(base);
}

number = normalize(number);

if (number) {
if (base === 'dec') {
return number === 'NaN' || !isNaN(+number);
} else if (base === 'bin16') {
return /^(0b)?[01]{16}$/i.test(number);
} else if (base === 'bin32') {
return /^(0b)?[01]{32}$/i.test(number);
} else if (base === 'bin64') {
return /^(0b)?[01]{64}$/i.test(number);
} else if (base === 'hex16') {
return /^(0x)?[0-9a-f]{4}$/i.test(number);
} else if (base === 'hex32') {
return /^(0x)?[0-9a-f]{8}$/i.test(number);
} else if (base === 'hex64') {
Expand All @@ -96,10 +107,14 @@ function extIeee754() {

if (fromBase === 'dec') {
return +number;
} else if (fromBase === 'bin16') {
return parseToView(8, 2, number).getFloat16(0);
} else if (fromBase === 'bin32') {
return parseToView(8, 2, number).getFloat32(0);
} else if (fromBase === 'bin64') {
return parseToView(8, 2, number).getFloat64(0);
} else if (fromBase === 'hex16') {
return parseToView(2, 16, number).getFloat16(0);
} else if (fromBase === 'hex32') {
return parseToView(2, 16, number).getFloat32(0);
} else if (fromBase === 'hex64') {
Expand All @@ -113,14 +128,20 @@ function extIeee754() {
} else {
number = +number;

if (toBase === 'dec32') {
if (toBase === 'dec16') {
return getExactDec(new DataView(numberToArr16(number).buffer).getFloat16(0));
} else if (toBase === 'dec32') {
return getExactDec(new DataView(numberToArr32(number).buffer).getFloat32(0));
} else if (toBase === 'dec64') {
return getExactDec(number);
} else if (toBase === 'bin16') {
return arrToBase(2, numberToArr16(number)).replace(/^(.)(.{5})(.+)$/, '$1 $2 $3');
} else if (toBase === 'bin32') {
return arrToBase(2, numberToArr32(number)).replace(/^(.)(.{8})(.+)$/, '$1 $2 $3');
} else if (toBase === 'bin64') {
return arrToBase(2, numberToArr64(number)).replace(/^(.)(.{11})(.+)$/, '$1 $2 $3');
} else if (toBase === 'hex16') {
return arrToBase(16, numberToArr16(number));
} else if (toBase === 'hex32') {
return arrToBase(16, numberToArr32(number));
} else if (toBase === 'hex64') {
Expand Down
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