Примітка. Імена полів таблиць, виділені жирним шрифтом і фоном (наприклад, CCD_SD_POS), є ключовими полями відповідної таблиці.
Додаток 6
до Специфікації форматів
електронних повідомлень
автоматизованої системи
митного оформлення товарів
та інших предметів
програмно-інформаційного
комплексу "Інспектор-2006"
на рівні митний орган -
Регіональна інформаційна
митниця
ФУНКЦІЯ
розрахунку 32-розрядної контрольної суми (мова C)
/**********
*
* Copyright, applying to UpdateCRC() and crc_32_tab[]:
*
* COPYRIGHT (C) 1986 Gary S.Brown.
*
**********/
/**********
*
* First, the polynomial itself and its table of feedback
terms. The
* polynomial is
*
X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+
X^1+X^0
*
* Note that we take it "backwards" and put the highest-order
term in
* the lowest-order bit. The X^32 term is "implied"; the LSB
is the
* X^31 term, etc. The X^0 term (usually shown as "+1")
results in
* the MSB being 1.
*
* Note that the usual hardware shift register implementation,
which
* is what we're using (we're merely optimizing it by doing
eight-bit
* chunks at a time) shifts bits into the lowest-order term.
In our
* implementation, that means shifting towards the right. Why
do we
* do it this way? Because the calculated CRC must be
transmitted in
* order from highest-order term to lowest-order term. UARTs
transmit
* characters in order from LSB to MSB. By storing the CRC
this way,
* we hand it to the UART in the order low-byte to high-byte;
the UART
* sends each low-bit to hight-bit; and the result is
transmission bit
* by bit from highest- to lowest-order term without requiring
any bit
* shuffling on our part. Reception works similarly.
*
* The feedback terms table consists of 256, 32-bit entries.
Notes:
*
* The table can be generated at runtime if desired; code to
do so
* is shown later. It might not be obvious, but the feedback
* terms simply represent the results of eight shift/xor
opera-
* tions for all combinations of data and CRC register values.
*
* The values must be right-shifted by eight bits by the
"updcrc"
* logic; the shift must be unsigned (bring in zeroes). On
some
* hardware you could probably optimize the shift in assembler
by
* using byte-swap instructions.
* polynomial $edb88320
*
**********/
unsigned long crc_32_tab[] =
{
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL,
0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L,
0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL,
0xe7b82d07L,
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L,
0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
0x136c9856L,
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL,
0x63066cd9L,
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL,
0xd56041e4L,
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL,
0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L,
0x32d86ce3L,
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL,
0x51de003aL,
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L,
0xcfba9599L,
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L,
0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
0x76dc4190L,
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L,
0x06b6b51fL,
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L,
0x9609a88eL,
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L,
0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL,
0x6c0695edL,
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L,
0x12b7e950L,
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L,
0x8cd37cf3L,
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L,
0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
0x4369e96aL,
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L,
0x33031de5L,
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL,
0xbe0b1010L,
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L,
0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L,
0x59b33d17L,
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L,
0x9abfb3b6L,
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL,
0x04db2615L,
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL,
0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
0xf00f9344L,
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL,
0x806567cbL,
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L,
0x10da7a5aL,
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L,
0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L,
0xd1bb67f1L,
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL,
0xaf0a1b4cL,
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L,
0x316e8eefL,
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L,
0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
0xc5ba3bbeL,
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L,
0xb5d0cf31L,
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L,
0x756aa39cL,
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L,
0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L,
0x92d28e9bL,
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L,
0xf1d4e242L,
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL,
0x6fb077e1L,
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL,
0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
0xa00ae278L,
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L,
0xd06016f7L,
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL,
0x40df0b66L,
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL,
0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L,
0xbad03605L,
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL,
0xc4614ab8L,
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L,
0x5a05df1bL,
0x2d02ef8dL
);
/**********
*
* UpdateCRC32()
*
*
*
**********/
long UpdateCRC32(unsigned long crc32val, unsigned char *s,
int len)
{
register unsigned long crcval = crc32val;
while (len--)
crcval = crc_32_tab[((unsigned char) crcval ^ (*s++)) & 0xff]
^ (crcval >> 8);
return(crcval);
)
/**********
*
*
* End of File
*
*
*
**********/
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