jimeh/node-base58
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Use soft-tabs instead of tabs, minor whitespace cleanup

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Jim Myhrberg
2017-07-09 18:10:01 +01:00
parent bc11e0f8d7
commit 9edf3f1a2c
4 changed files with 120 additions and 129 deletions
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54
src/base58.js
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@@ -1,54 +1,52 @@
var alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
var base = alphabet.length;
// Create a lookup table to fetch character index
var alphabetLookup = alphabet.split('').reduce(function (lookup, char, index) {
lookup[char] = index;
return lookup;
lookup[char] = index;
return lookup;
}, {});
function assertNonNegativeSafeInteger(val) {
if (typeof val !== 'number' || isNaN(val) || val < 0 || val > Number.MAX_SAFE_INTEGER || Math.floor(val) !== val) {
throw new Error('Value passed is not a non-negative safe integer.');
}
if (typeof val !== 'number' || isNaN(val) || val < 0 || val > Number.MAX_SAFE_INTEGER || Math.floor(val) !== val) {
throw new Error('Value passed is not a non-negative safe integer.');
}
}
function assertString(str) {
if (typeof str !== 'string') {
throw new Error('Value passed is not a string.');
}
if (typeof str !== 'string') {
throw new Error('Value passed is not a string.');
}
}
function assertBase58Character(character) {
if (alphabetLookup[character] === undefined) {
throw new Error('Value passed is not a valid Base58 string.');
}
if (alphabetLookup[character] === undefined) {
throw new Error('Value passed is not a valid Base58 string.');
}
}
exports.encode = function (num) {
var str = '';
var modulus;
var str = '';
var modulus;
num = Number(num);
num = Number(num);
assertNonNegativeSafeInteger(num);
assertNonNegativeSafeInteger(num);
while (num >= base) {
modulus = num % base;
str = alphabet[modulus] + str;
num = Math.floor(num / base);
}
while (num >= base) {
modulus = num % base;
str = alphabet[modulus] + str;
num = Math.floor(num / base);
}
return alphabet[num] + str;
return alphabet[num] + str;
};
exports.decode = function (str) {
assertString(str);
assertString(str);
return str.split('').reverse().reduce(function (num, character, index) {
assertBase58Character(character);
return num + alphabetLookup[character] * Math.pow(base, index);
}, 0);
return str.split('').reverse().reduce(function (num, character, index) {
assertBase58Character(character);
return num + alphabetLookup[character] * Math.pow(base, index);
}, 0);
};