package edu.cmu.sv.arinc838.crc;
public class Crc64Generator implements CrcGenerator {
final static int[] tableHigh = { 0x00000000, 0x42F0E1EB, 0x85E1C3D7,
0xC711223C, 0x49336645, 0x0BC387AE, 0xCCD2A592, 0x8E224479,
0x9266CC8A, 0xD0962D61, 0x17870F5D, 0x5577EEB6, 0xDB55AACF,
0x99A54B24, 0x5EB46918, 0x1C4488F3, 0x663D78FF, 0x24CD9914,
0xE3DCBB28, 0xA12C5AC3, 0x2F0E1EBA, 0x6DFEFF51, 0xAAEFDD6D,
0xE81F3C86, 0xF45BB475, 0xB6AB559E, 0x71BA77A2, 0x334A9649,
0xBD68D230, 0xFF9833DB, 0x388911E7, 0x7A79F00C, 0xCC7AF1FF,
0x8E8A1014, 0x499B3228, 0x0B6BD3C3, 0x854997BA, 0xC7B97651,
0x00A8546D, 0x4258B586, 0x5E1C3D75, 0x1CECDC9E, 0xDBFDFEA2,
0x990D1F49, 0x172F5B30, 0x55DFBADB, 0x92CE98E7, 0xD03E790C,
0xAA478900, 0xE8B768EB, 0x2FA64AD7, 0x6D56AB3C, 0xE374EF45,
0xA1840EAE, 0x66952C92, 0x2465CD79, 0x3821458A, 0x7AD1A461,
0xBDC0865D, 0xFF3067B6, 0x711223CF, 0x33E2C224, 0xF4F3E018,
0xB60301F3, 0xDA050215, 0x98F5E3FE, 0x5FE4C1C2, 0x1D142029,
0x93366450, 0xD1C685BB, 0x16D7A787, 0x5427466C, 0x4863CE9F,
0x0A932F74, 0xCD820D48, 0x8F72ECA3, 0x0150A8DA, 0x43A04931,
0x84B16B0D, 0xC6418AE6, 0xBC387AEA, 0xFEC89B01, 0x39D9B93D,
0x7B2958D6, 0xF50B1CAF, 0xB7FBFD44, 0x70EADF78, 0x321A3E93,
0x2E5EB660, 0x6CAE578B, 0xABBF75B7, 0xE94F945C, 0x676DD025,
0x259D31CE, 0xE28C13F2, 0xA07CF219, 0x167FF3EA, 0x548F1201,
0x939E303D, 0xD16ED1D6, 0x5F4C95AF, 0x1DBC7444, 0xDAAD5678,
0x985DB793, 0x84193F60, 0xC6E9DE8B, 0x01F8FCB7, 0x43081D5C,
0xCD2A5925, 0x8FDAB8CE, 0x48CB9AF2, 0x0A3B7B19, 0x70428B15,
0x32B26AFE, 0xF5A348C2, 0xB753A929, 0x3971ED50, 0x7B810CBB,
0xBC902E87, 0xFE60CF6C, 0xE224479F, 0xA0D4A674, 0x67C58448,
0x253565A3, 0xAB1721DA, 0xE9E7C031, 0x2EF6E20D, 0x6C0603E6,
0xF6FAE5C0, 0xB40A042B, 0x731B2617, 0x31EBC7FC, 0xBFC98385,
0xFD39626E, 0x3A284052, 0x78D8A1B9, 0x649C294A, 0x266CC8A1,
0xE17DEA9D, 0xA38D0B76, 0x2DAF4F0F, 0x6F5FAEE4, 0xA84E8CD8,
0xEABE6D33, 0x90C79D3F, 0xD2377CD4, 0x15265EE8, 0x57D6BF03,
0xD9F4FB7A, 0x9B041A91, 0x5C1538AD, 0x1EE5D946, 0x02A151B5,
0x4051B05E, 0x87409262, 0xC5B07389, 0x4B9237F0, 0x0962D61B,
0xCE73F427, 0x8C8315CC, 0x3A80143F, 0x7870F5D4, 0xBF61D7E8,
0xFD913603, 0x73B3727A, 0x31439391, 0xF652B1AD, 0xB4A25046,
0xA8E6D8B5, 0xEA16395E, 0x2D071B62, 0x6FF7FA89, 0xE1D5BEF0,
0xA3255F1B, 0x64347D27, 0x26C49CCC, 0x5CBD6CC0, 0x1E4D8D2B,
0xD95CAF17, 0x9BAC4EFC, 0x158E0A85, 0x577EEB6E, 0x906FC952,
0xD29F28B9, 0xCEDBA04A, 0x8C2B41A1, 0x4B3A639D, 0x09CA8276,
0x87E8C60F, 0xC51827E4, 0x020905D8, 0x40F9E433, 0x2CFFE7D5,
0x6E0F063E, 0xA91E2402, 0xEBEEC5E9, 0x65CC8190, 0x273C607B,
0xE02D4247, 0xA2DDA3AC, 0xBE992B5F, 0xFC69CAB4, 0x3B78E888,
0x79880963, 0xF7AA4D1A, 0xB55AACF1, 0x724B8ECD, 0x30BB6F26,
0x4AC29F2A, 0x08327EC1, 0xCF235CFD, 0x8DD3BD16, 0x03F1F96F,
0x41011884, 0x86103AB8, 0xC4E0DB53, 0xD8A453A0, 0x9A54B24B,
0x5D459077, 0x1FB5719C, 0x919735E5, 0xD367D40E, 0x1476F632,
0x568617D9, 0xE085162A, 0xA275F7C1, 0x6564D5FD, 0x27943416,
0xA9B6706F, 0xEB469184, 0x2C57B3B8, 0x6EA75253, 0x72E3DAA0,
0x30133B4B, 0xF7021977, 0xB5F2F89C, 0x3BD0BCE5, 0x79205D0E,
0xBE317F32, 0xFCC19ED9, 0x86B86ED5, 0xC4488F3E, 0x0359AD02,
0x41A94CE9, 0xCF8B0890, 0x8D7BE97B, 0x4A6ACB47, 0x089A2AAC,
0x14DEA25F, 0x562E43B4, 0x913F6188, 0xD3CF8063, 0x5DEDC41A,
0x1F1D25F1, 0xD80C07CD, 0x9AFCE626 };
final static int[] tableLow = { 0x00000000, 0xA9EA3693, 0x53D46D26,
0xFA3E5BB5, 0x0E42ECDF, 0xA7A8DA4C, 0x5D9681F9, 0xF47CB76A,
0x1C85D9BE, 0xB56FEF2D, 0x4F51B498, 0xE6BB820B, 0x12C73561,
0xBB2D03F2, 0x41135847, 0xE8F96ED4, 0x90E185EF, 0x390BB37C,
0xC335E8C9, 0x6ADFDE5A, 0x9EA36930, 0x37495FA3, 0xCD770416,
0x649D3285, 0x8C645C51, 0x258E6AC2, 0xDFB03177, 0x765A07E4,
0x8226B08E, 0x2BCC861D, 0xD1F2DDA8, 0x7818EB3B, 0x21C30BDE,
0x88293D4D, 0x721766F8, 0xDBFD506B, 0x2F81E701, 0x866BD192,
0x7C558A27, 0xD5BFBCB4, 0x3D46D260, 0x94ACE4F3, 0x6E92BF46,
0xC77889D5, 0x33043EBF, 0x9AEE082C, 0x60D05399, 0xC93A650A,
0xB1228E31, 0x18C8B8A2, 0xE2F6E317, 0x4B1CD584, 0xBF6062EE,
0x168A547D, 0xECB40FC8, 0x455E395B, 0xADA7578F, 0x044D611C,
0xFE733AA9, 0x57990C3A, 0xA3E5BB50, 0x0A0F8DC3, 0xF031D676,
0x59DBE0E5, 0xEA6C212F, 0x438617BC, 0xB9B84C09, 0x10527A9A,
0xE42ECDF0, 0x4DC4FB63, 0xB7FAA0D6, 0x1E109645, 0xF6E9F891,
0x5F03CE02, 0xA53D95B7, 0x0CD7A324, 0xF8AB144E, 0x514122DD,
0xAB7F7968, 0x02954FFB, 0x7A8DA4C0, 0xD3679253, 0x2959C9E6,
0x80B3FF75, 0x74CF481F, 0xDD257E8C, 0x271B2539, 0x8EF113AA,
0x66087D7E, 0xCFE24BED, 0x35DC1058, 0x9C3626CB, 0x684A91A1,
0xC1A0A732, 0x3B9EFC87, 0x9274CA14, 0xCBAF2AF1, 0x62451C62,
0x987B47D7, 0x31917144, 0xC5EDC62E, 0x6C07F0BD, 0x9639AB08,
0x3FD39D9B, 0xD72AF34F, 0x7EC0C5DC, 0x84FE9E69, 0x2D14A8FA,
0xD9681F90, 0x70822903, 0x8ABC72B6, 0x23564425, 0x5B4EAF1E,
0xF2A4998D, 0x089AC238, 0xA170F4AB, 0x550C43C1, 0xFCE67552,
0x06D82EE7, 0xAF321874, 0x47CB76A0, 0xEE214033, 0x141F1B86,
0xBDF52D15, 0x49899A7F, 0xE063ACEC, 0x1A5DF759, 0xB3B7C1CA,
0x7D3274CD, 0xD4D8425E, 0x2EE619EB, 0x870C2F78, 0x73709812,
0xDA9AAE81, 0x20A4F534, 0x894EC3A7, 0x61B7AD73, 0xC85D9BE0,
0x3263C055, 0x9B89F6C6, 0x6FF541AC, 0xC61F773F, 0x3C212C8A,
0x95CB1A19, 0xEDD3F122, 0x4439C7B1, 0xBE079C04, 0x17EDAA97,
0xE3911DFD, 0x4A7B2B6E, 0xB04570DB, 0x19AF4648, 0xF156289C,
0x58BC1E0F, 0xA28245BA, 0x0B687329, 0xFF14C443, 0x56FEF2D0,
0xACC0A965, 0x052A9FF6, 0x5CF17F13, 0xF51B4980, 0x0F251235,
0xA6CF24A6, 0x52B393CC, 0xFB59A55F, 0x0167FEEA, 0xA88DC879,
0x4074A6AD, 0xE99E903E, 0x13A0CB8B, 0xBA4AFD18, 0x4E364A72,
0xE7DC7CE1, 0x1DE22754, 0xB40811C7, 0xCC10FAFC, 0x65FACC6F,
0x9FC497DA, 0x362EA149, 0xC2521623, 0x6BB820B0, 0x91867B05,
0x386C4D96, 0xD0952342, 0x797F15D1, 0x83414E64, 0x2AAB78F7,
0xDED7CF9D, 0x773DF90E, 0x8D03A2BB, 0x24E99428, 0x975E55E2,
0x3EB46371, 0xC48A38C4, 0x6D600E57, 0x991CB93D, 0x30F68FAE,
0xCAC8D41B, 0x6322E288, 0x8BDB8C5C, 0x2231BACF, 0xD80FE17A,
0x71E5D7E9, 0x85996083, 0x2C735610, 0xD64D0DA5, 0x7FA73B36,
0x07BFD00D, 0xAE55E69E, 0x546BBD2B, 0xFD818BB8, 0x09FD3CD2,
0xA0170A41, 0x5A2951F4, 0xF3C36767, 0x1B3A09B3, 0xB2D03F20,
0x48EE6495, 0xE1045206, 0x1578E56C, 0xBC92D3FF, 0x46AC884A,
0xEF46BED9, 0xB69D5E3C, 0x1F7768AF, 0xE549331A, 0x4CA30589,
0xB8DFB2E3, 0x11358470, 0xEB0BDFC5, 0x42E1E956, 0xAA188782,
0x03F2B111, 0xF9CCEAA4, 0x5026DC37, 0xA45A6B5D, 0x0DB05DCE,
0xF78E067B, 0x5E6430E8, 0x267CDBD3, 0x8F96ED40, 0x75A8B6F5,
0xDC428066, 0x283E370C, 0x81D4019F, 0x7BEA5A2A, 0xD2006CB9,
0x3AF9026D, 0x931334FE, 0x692D6F4B, 0xC0C759D8, 0x34BBEEB2,
0x9D51D821, 0x676F8394, 0xCE85B507 };
@Override
public long calculateCrc(byte[] buffer) {
long low = 0xFFFFFFFFl, high = 0xFFFFFFFFl;
int index; // Index into table
long tempLow; // A working temporary
long tempHigh; // A working temporary
// Loop for each byte in buffer
for (int i = 0; i < buffer.length; i++) {
// Compute the table index for this byte
index = (int) (((high >> 24) ^ (int) buffer[i]) & 0xFF);
// Update the running crc
tempHigh = ((high << 8) | ((low >> 24) & 0x000000FFl)) & 0xFFFFFFFFl;
tempLow = (low << 8) & 0xFFFFFFFFl;
high = (tempHigh ^ tableHigh[index]) & 0xFFFFFFFFl;
low = (tempLow ^ tableLow[index]) & 0xFFFFFFFFl;
}
high ^= 0xFFFFFFFFl;
low ^= 0xFFFFFFFFl;
return low | (high << 32);
}
/*
* Generates CRC lookup table above. Ported from C code in spec.
static int[] tableHigh = new int[256];
static int[] tableLow = new int[256];
static int regHigh;
static int regLow;
static {
// Loop for each possible byte value
for (int iByteVal=0; iByteVal < 256; iByteVal++) {
// Make the Table entry for the current byte value
MakeTableEntry(iByteVal);
tableHigh[iByteVal] = regHigh;
tableLow[iByteVal] = regLow;
}
// PrintTable(); // Comment out if desired
}
static void MakeTableEntry(int byteVal)
{
int generatorLow = 0xA9EA3693;
int generatorHigh = 0x42F0E1EB;
regHigh = byteVal << 24;
regLow = 0x00000000;
int msb; // Most significant bit of reg (before shift)
// Loop for each bit in high byte of reg
for (int i=0; i < 8; i++) {
// Save the most significant bit for later
msb = regHigh & 0x80000000;
// Shift reg left one bit
regHigh <<= 1;
if ((regLow & 0x80000000) != 0) {
regHigh |= 0x00000001;
}
regLow <<= 1;
// If most significant bit was 1 (before the shift)
if (msb != 0) {
// XOR the generator into reg
regHigh ^= generatorHigh;
regLow ^= generatorLow;
}
}
}
*/
}