19 lines
536 B
Dart
19 lines
536 B
Dart
// utils/crc_calculator.dart
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import 'dart:typed_data';
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class Crc16Ccitt {
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static String computeCrc16Ccitt(Uint8List bytes) {
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int crc = 0xFFFF; // Initial value
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int polynomial = 0x1021; // Matches Java's 0x1021
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for (int b in bytes) {
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for (int i = 0; i < 8; i++) {
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bool bit = ((b >> (7 - i) & 1) == 1);
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bool c15 = ((crc >> 15 & 1) == 1);
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crc <<= 1;
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if (c15 ^ bit) crc ^= polynomial;
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}
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}
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crc &= 0xffff;
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return crc.toRadixString(16).padLeft(4, '0').toUpperCase();
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}
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} |