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crc32.c
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crc32.c
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#include <sys/types.h>
#include "ts2shout.h"
// CRC32 lookup table for polynomial 0x04c11db7
/* Code snippet from dvbsnoop.
* Works perfectly ok for MPEG TS/DVB-like CRC calculations. You can find it in src/misc/crc32.c
* Please see http://dvbsnoop.sourceforge.net/ for more information about dvbsnoop */
static uint32_t crc_table[256] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4};
uint32_t dvb_crc32 (unsigned char *data, int len)
{
int i;
uint32_t crc = 0xffffffff;
for (i=0; i<len; i++)
crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *data++) & 0xff];
return crc;
}
/* CRC16 GENIBUS as used by RDS data - generated with the help of
* https://github.com/madler/crcany. */
static uint16_t crc_byte[] = {
0x1e0f, 0x0e2e, 0x3e4d, 0x2e6c, 0x5e8b, 0x4eaa, 0x7ec9, 0x6ee8, 0x9f07, 0x8f26,
0xbf45, 0xaf64, 0xdf83, 0xcfa2, 0xffc1, 0xefe0, 0x0c3e, 0x1c1f, 0x2c7c, 0x3c5d,
0x4cba, 0x5c9b, 0x6cf8, 0x7cd9, 0x8d36, 0x9d17, 0xad74, 0xbd55, 0xcdb2, 0xdd93,
0xedf0, 0xfdd1, 0x3a6d, 0x2a4c, 0x1a2f, 0x0a0e, 0x7ae9, 0x6ac8, 0x5aab, 0x4a8a,
0xbb65, 0xab44, 0x9b27, 0x8b06, 0xfbe1, 0xebc0, 0xdba3, 0xcb82, 0x285c, 0x387d,
0x081e, 0x183f, 0x68d8, 0x78f9, 0x489a, 0x58bb, 0xa954, 0xb975, 0x8916, 0x9937,
0xe9d0, 0xf9f1, 0xc992, 0xd9b3, 0x56cb, 0x46ea, 0x7689, 0x66a8, 0x164f, 0x066e,
0x360d, 0x262c, 0xd7c3, 0xc7e2, 0xf781, 0xe7a0, 0x9747, 0x8766, 0xb705, 0xa724,
0x44fa, 0x54db, 0x64b8, 0x7499, 0x047e, 0x145f, 0x243c, 0x341d, 0xc5f2, 0xd5d3,
0xe5b0, 0xf591, 0x8576, 0x9557, 0xa534, 0xb515, 0x72a9, 0x6288, 0x52eb, 0x42ca,
0x322d, 0x220c, 0x126f, 0x024e, 0xf3a1, 0xe380, 0xd3e3, 0xc3c2, 0xb325, 0xa304,
0x9367, 0x8346, 0x6098, 0x70b9, 0x40da, 0x50fb, 0x201c, 0x303d, 0x005e, 0x107f,
0xe190, 0xf1b1, 0xc1d2, 0xd1f3, 0xa114, 0xb135, 0x8156, 0x9177, 0x8f87, 0x9fa6,
0xafc5, 0xbfe4, 0xcf03, 0xdf22, 0xef41, 0xff60, 0x0e8f, 0x1eae, 0x2ecd, 0x3eec,
0x4e0b, 0x5e2a, 0x6e49, 0x7e68, 0x9db6, 0x8d97, 0xbdf4, 0xadd5, 0xdd32, 0xcd13,
0xfd70, 0xed51, 0x1cbe, 0x0c9f, 0x3cfc, 0x2cdd, 0x5c3a, 0x4c1b, 0x7c78, 0x6c59,
0xabe5, 0xbbc4, 0x8ba7, 0x9b86, 0xeb61, 0xfb40, 0xcb23, 0xdb02, 0x2aed, 0x3acc,
0x0aaf, 0x1a8e, 0x6a69, 0x7a48, 0x4a2b, 0x5a0a, 0xb9d4, 0xa9f5, 0x9996, 0x89b7,
0xf950, 0xe971, 0xd912, 0xc933, 0x38dc, 0x28fd, 0x189e, 0x08bf, 0x7858, 0x6879,
0x581a, 0x483b, 0xc743, 0xd762, 0xe701, 0xf720, 0x87c7, 0x97e6, 0xa785, 0xb7a4,
0x464b, 0x566a, 0x6609, 0x7628, 0x06cf, 0x16ee, 0x268d, 0x36ac, 0xd572, 0xc553,
0xf530, 0xe511, 0x95f6, 0x85d7, 0xb5b4, 0xa595, 0x547a, 0x445b, 0x7438, 0x6419,
0x14fe, 0x04df, 0x34bc, 0x249d, 0xe321, 0xf300, 0xc363, 0xd342, 0xa3a5, 0xb384,
0x83e7, 0x93c6, 0x6229, 0x7208, 0x426b, 0x524a, 0x22ad, 0x328c, 0x02ef, 0x12ce,
0xf110, 0xe131, 0xd152, 0xc173, 0xb194, 0xa1b5, 0x91d6, 0x81f7, 0x7018, 0x6039,
0x505a, 0x407b, 0x309c, 0x20bd, 0x10de, 0x00ff
};
/* Don't ask how it works :-) - https://crccalc.com/ was an inital helper here
* https://github.com/madler/crcany generated the table. But I don't know
* where 0xe2f0 comes from (xored it is 0x1d0f).
*/
uint16_t crc16(uint8_t *data, int len) {
int i;
uint16_t crc = 0x0000;
for (i = 0; i < len; i++) {
crc = (crc << 8) ^ crc_byte[((crc >> 8) ^ *data++) & 0xff];
}
crc ^= 0xe2f0;
return crc;
}