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19 lines
495 B
19 lines
495 B
var isStr = require('./isStr'); |
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var strToBytes = require('./strToBytes'); |
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exports = function(input, previous) { |
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return exports.signed(input, previous) >>> 0; |
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}; |
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exports.signed = function(input, previous) { |
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if (isStr(input)) input = strToBytes(input); |
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var crc = ~~previous; |
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var accum = 0; |
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for (var i = 0, len = input.length; i < len; i++) { |
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var byte = input[i]; |
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accum += byte; |
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} |
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crc += accum % 256; |
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return crc % 256; |
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}; |
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module.exports = exports;
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