JAVA CRC32
/** * CRC-32 * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>名称</th> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td> CRC-32</td> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * <tr> * <td> CRC-32/B</td> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">MSB First</td> * </tr> * <tr> * <td> CRC-32/C</td> * <td align="center">0x1EDC6F41</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * <tr> * <td> CRC-32/D</td> * <td align="center">0xA833982B</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * <tr> * <td> CRC-32/MPEG-2</td> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0x00000000</td> * <td align="center">MSB First</td> * </tr> * <tr> * <td> CRC-32/POSIX</td> * <td align="center">0x04C11DB7</td> * <td align="center">0x00000000</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">MSB First</td> * </tr> * </table> * * @author unnamed * */ public class CRC32Utils { /** * CRC-32 * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32(byte[] source, int offset, int length) { long wCRCin = 0xFFFFFFFFL; // Long.reverse(0x04C11DB7L) >>> 32 long wCPoly = 0xEDB88320L; for (int i = offset, cnt = offset + length; i < cnt; i++) { wCRCin ^= ((long) source[i] & 0x000000FFL); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x00000001L) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xFFFFFFFFL; } /** * CRC-32/B * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">MSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32_B(byte[] source, int offset, int length) { long wCRCin = 0xFFFFFFFFL; long wCPoly = 0x04C11DB7L; for (int i = offset, cnt = offset + length; i < cnt; i++) { for (int j = 0; j < 8; j++) { boolean bit = ((source[i] >> (7 - j) & 1) == 1); boolean c31 = ((wCRCin >> 31 & 1) == 1); wCRCin <<= 1; if (c31 ^ bit) { wCRCin ^= wCPoly; } } } wCRCin &= 0xFFFFFFFFL; return wCRCin ^= 0xFFFFFFFFL; } /** * CRC-32/C * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0x1EDC6F41</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32_C(byte[] source, int offset, int length) { long wCRCin = 0xFFFFFFFFL; // Long.reverse(0x1EDC6F41L) >>> 32 long wCPoly = 0x82F63B78L; for (int i = offset, cnt = offset + length; i < cnt; i++) { wCRCin ^= ((long) source[i] & 0x000000FFL); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x00000001L) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xFFFFFFFFL; } /** * CRC-32/D * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0xA833982B</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">LSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32_D(byte[] source, int offset, int length) { long wCRCin = 0xFFFFFFFFL; // Long.reverse(0xA833982BL) >>> 32 long wCPoly = 0xD419CC15L; for (int i = offset, cnt = offset + length; i < cnt; i++) { wCRCin ^= ((long) source[i] & 0x000000FFL); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x00000001L) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xFFFFFFFFL; } /** * CRC-32/MPEG-2 * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0x04C11DB7</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">0x00000000</td> * <td align="center">MSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32_MPEG_2(byte[] source, int offset, int length) { long wCRCin = 0xFFFFFFFFL; long wCPoly = 0x04C11DB7L; for (int i = offset, cnt = offset + length; i < cnt; i++) { for (int j = 0; j < 8; j++) { boolean bit = ((source[i] >> (7 - j) & 1) == 1); boolean c31 = ((wCRCin >> 31 & 1) == 1); wCRCin <<= 1; if (c31 ^ bit) { wCRCin ^= wCPoly; } } } wCRCin &= 0xFFFFFFFFL; return wCRCin ^= 0x00000000L; } /** * CRC-32/POSIX * * <table width="400px" border="1" cellpadding="0" cellspacing="0"> * <tr> * <th>多项式</th> * <th>初始值</th> * <th>异或值</th> * <th>Bit反转</th> * </tr> * <tr> * <td align="center">0x04C11DB7</td> * <td align="center">0x00000000</td> * <td align="center">0xFFFFFFFF</td> * <td align="center">MSB First</td> * </tr> * </table> * * @param source * @param offset * @param length * @return */ public static long CRC32_POSIX(byte[] source, int offset, int length) { long wCRCin = 0x00000000L; long wCPoly = 0x04C11DB7L; for (int i = offset, cnt = offset + length; i < cnt; i++) { for (int j = 0; j < 8; j++) { boolean bit = ((source[i] >> (7 - j) & 1) == 1); boolean c31 = ((wCRCin >> 31 & 1) == 1); wCRCin <<= 1; if (c31 ^ bit) { wCRCin ^= wCPoly; } } } wCRCin &= 0xFFFFFFFFL; return wCRCin ^= 0xFFFFFFFFL; } }
转：https://blog.csdn.net/zte1055889498/article/details/102784519
