package yaokong;
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public class CRC16 {
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private static final int POLYNOMIAL = 0x1021;
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private static final int INITIAL_VALUE = 0xFFFF;
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// 计算给定数据段的CRC16校验值
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public static int calculateCRC16(byte[] data, int offset, int length) {
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int crc = INITIAL_VALUE;
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for (int i = offset; i < offset + length; i++) {
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crc ^= (data[i] & 0xFF) << 8;
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for (int j = 0; j < 8; j++) {
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if ((crc & 0x8000) != 0) {
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crc = (crc << 1) ^ POLYNOMIAL;
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} else {
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crc <<= 1;
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}
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}
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}
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return crc & 0xFFFF;
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}
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}
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