55 lines
1.3 KiB
JavaScript
55 lines
1.3 KiB
JavaScript
'use strict';
|
|
|
|
var _ = require('lodash');
|
|
var buffer = require('buffer');
|
|
var assert = require('assert');
|
|
|
|
var isHexa = function isHexa(value) {
|
|
if (!_.isString(value)) {
|
|
return false;
|
|
}
|
|
return /^[0-9a-fA-F]+$/.test(value);
|
|
};
|
|
|
|
module.exports = {
|
|
isValidJson: function isValidJson(arg) {
|
|
try {
|
|
JSON.parse(arg);
|
|
return true;
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
},
|
|
emptyBuffer: function emptyBuffer(bytes) {
|
|
var result = new Buffer(bytes);
|
|
for (var i = 0; i < bytes; i++) {
|
|
result.write('\0', i);
|
|
}
|
|
return result;
|
|
},
|
|
integerAsSingleByteBuffer: function integerAsSingleByteBuffer(integer) {
|
|
return new Buffer([integer & 0xff]);
|
|
},
|
|
integerAsBuffer: function integerAsBuffer(integer) {
|
|
var bytes = [];
|
|
bytes.push((integer >> 24) & 0xff);
|
|
bytes.push((integer >> 16) & 0xff);
|
|
bytes.push((integer >> 8) & 0xff);
|
|
bytes.push(integer & 0xff);
|
|
return new Buffer(bytes);
|
|
},
|
|
isHexa: isHexa,
|
|
isHexaString: isHexa,
|
|
|
|
integerFromBuffer: function integerFromBuffer(buffer) {
|
|
return buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
|
|
},
|
|
bufferToHex: function bufferToHex(buffer) {
|
|
return buffer.toString('hex');
|
|
},
|
|
hexToBuffer: function hexToBuffer(string) {
|
|
assert(isHexa(string));
|
|
return new buffer.Buffer(string, 'hex');
|
|
}
|
|
};
|