105 lines
No EOL
3.2 KiB
JavaScript
105 lines
No EOL
3.2 KiB
JavaScript
//https://raw.github.com/bitcoinjs/bitcoinjs-lib/09e8c6e184d6501a0c2c59d73ca64db5c0d3eb95/src/util.js
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// Bitcoin utility functions
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Bitcoin.Util = {
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/**
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* Cross-browser compatibility version of Array.isArray.
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*/
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isArray: Array.isArray || function (o) {
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return Object.prototype.toString.call(o) === '[object Array]';
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},
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/**
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* Create an array of a certain length filled with a specific value.
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*/
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makeFilledArray: function (len, val) {
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var array = [];
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var i = 0;
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while (i < len) {
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array[i++] = val;
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}
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return array;
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},
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/**
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* Turn an integer into a "var_int".
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*
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* "var_int" is a variable length integer used by Bitcoin's binary format.
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*
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* Returns a byte array.
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*/
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numToVarInt: function (i) {
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if (i < 0xfd) {
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// unsigned char
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return [i];
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} else if (i <= 1 << 16) {
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// unsigned short (LE)
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return [0xfd, i >>> 8, i & 255];
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} else if (i <= 1 << 32) {
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// unsigned int (LE)
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return [0xfe].concat(Crypto.util.wordsToBytes([i]));
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} else {
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// unsigned long long (LE)
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return [0xff].concat(Crypto.util.wordsToBytes([i >>> 32, i]));
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}
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},
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/**
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* Parse a Bitcoin value byte array, returning a BigInteger.
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*/
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valueToBigInt: function (valueBuffer) {
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if (valueBuffer instanceof BigInteger) return valueBuffer;
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// Prepend zero byte to prevent interpretation as negative integer
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return BigInteger.fromByteArrayUnsigned(valueBuffer);
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},
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/**
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* Format a Bitcoin value as a string.
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*
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* Takes a BigInteger or byte-array and returns that amount of Bitcoins in a
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* nice standard formatting.
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*
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* Examples:
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* 12.3555
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* 0.1234
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* 900.99998888
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* 34.00
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*/
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formatValue: function (valueBuffer) {
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var value = this.valueToBigInt(valueBuffer).toString();
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var integerPart = value.length > 8 ? value.substr(0, value.length - 8) : '0';
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var decimalPart = value.length > 8 ? value.substr(value.length - 8) : value;
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while (decimalPart.length < 8) decimalPart = "0" + decimalPart;
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decimalPart = decimalPart.replace(/0*$/, '');
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while (decimalPart.length < 2) decimalPart += "0";
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return integerPart + "." + decimalPart;
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},
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/**
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* Parse a floating point string as a Bitcoin value.
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*
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* Keep in mind that parsing user input is messy. You should always display
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* the parsed value back to the user to make sure we understood his input
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* correctly.
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*/
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parseValue: function (valueString) {
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// TODO: Detect other number formats (e.g. comma as decimal separator)
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var valueComp = valueString.split('.');
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var integralPart = valueComp[0];
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var fractionalPart = valueComp[1] || "0";
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while (fractionalPart.length < 8) fractionalPart += "0";
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fractionalPart = fractionalPart.replace(/^0+/g, '');
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var value = BigInteger.valueOf(parseInt(integralPart));
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value = value.multiply(BigInteger.valueOf(100000000));
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value = value.add(BigInteger.valueOf(parseInt(fractionalPart)));
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return value;
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},
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/**
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* Calculate RIPEMD160(SHA256(data)).
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*
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* Takes an arbitrary byte array as inputs and returns the hash as a byte
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* array.
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*/
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sha256ripe160: function (data) {
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return Crypto.RIPEMD160(Crypto.SHA256(data, { asBytes: true }), { asBytes: true });
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},
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// double sha256
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dsha256: function (data) {
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return Crypto.SHA256(Crypto.SHA256(data, { asBytes: true }), { asBytes: true });
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}
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}; |