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// Generated by CoffeeScript 1.9.2
var Buffer, create;
Buffer = require('buffer').Buffer;
create = require('./create');
module.exports = create('xmodem', function(buf, previous) {
var code, count, crc, i;
if (!Buffer.isBuffer(buf)) {
buf = Buffer(buf);
}
crc = previous != null ? ~~previous : 0x0;
count = buf.length;
i = 0;
while (count > 0) {
code = crc >>> 8 & 0xFF;
code ^= buf[i++] & 0xFF;
code ^= code >>> 4;
crc = crc << 8 & 0xFFFF;
crc ^= code;
code = code << 5 & 0xFFFF;
crc ^= code;
code = code << 7 & 0xFFFF;
crc ^= code;
count--;
}
return crc;
});
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