From 6de906c09336a2d2c649eb42f98782e5fd9df99c Mon Sep 17 00:00:00 2001 From: cfif Date: Mon, 26 May 2025 14:41:46 +0300 Subject: [PATCH] Init --- crc32_edb88320.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++ crc32_edb88320.h | 14 +++++ modular.json | 10 ++++ 3 files changed, 160 insertions(+) create mode 100644 crc32_edb88320.c create mode 100644 crc32_edb88320.h create mode 100644 modular.json diff --git a/crc32_edb88320.c b/crc32_edb88320.c new file mode 100644 index 0000000..97eb9e3 --- /dev/null +++ b/crc32_edb88320.c @@ -0,0 +1,136 @@ +// +// Created by cfif on 02.05.23. +// +#include "crc32_edb88320.h" + + +/* + * The CRC polynomial and other parameters were found using + * CRC reveng. They are: + * width=32 + * poly=0x04c11db7 + * init=0xffffffff + * refin=false + * refout=false + * xorout=0x00000000 + * check=0x0376e6e7 + * + * The table was generated by pycrc with the configuration: + * Width 32 + * Poly 0x04c11db7 + * Xor_In 0xffffffff + * ReflectIn False + * Xor_Out 0x00000000 + * ReflectOut False + * Algorithm table-driven + */ + +static uint32_t crc32tab[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 +}; + +static uint8_t reverse8(uint8_t b) { + b = (b & 0xF0) >> 4 | (b & 0x0F) << 4; + b = (b & 0xCC) >> 2 | (b & 0x33) << 2; + b = (b & 0xAA) >> 1 | (b & 0x55) << 1; + return b; +} + +uint32_t reverse32(uint32_t bits) { + uint32_t ml, mh; + for (int i = 0; i < 32 / 2; i++) { + // Get lower side bit + ml = (bits & (1 << i)); + // Move lower bit to higher + ml <<= (31 - i * 2); + // Get higher side bit + mh = (bits & (1 << (31 - i))); + // Move higher bit to lower + mh >>= (31 - i * 2); + // reset lower and higher (both) bits + bits &= ~(1 << i); + bits &= ~(1 << (31 - i)); + // copy swapped bits back to bits + bits |= (ml | mh); + } + return bits; +} + +uint32_t crc32_calc(uint8_t *pBuf, size_t size) { + uint32_t c = 0xFFFFFFFF; + + for (size_t i = 0; i < size; i++) + c = (c << 8) ^ crc32tab[(c >> 24) ^ reverse8(pBuf[i])]; + + return reverse32(c ^ 0xFFFFFFFF); +} + + +uint32_t crc32_edb88320(const uint8_t *buf, size_t size) { + uint32_t crc = crc32_calc(buf, size); + + return crc; +} \ No newline at end of file diff --git a/crc32_edb88320.h b/crc32_edb88320.h new file mode 100644 index 0000000..9523501 --- /dev/null +++ b/crc32_edb88320.h @@ -0,0 +1,14 @@ +// +// Created by cfif on 02.05.23. +// + +#ifndef GONEC_FULL_CRC32_EDB88320_H +#define GONEC_FULL_CRC32_EDB88320_H + +#include "inttypes.h" +#include "string.h" + +uint32_t crc32_edb88320(const uint8_t *buf, size_t size); + + +#endif //GONEC_FULL_CRC32_EDB88320_H diff --git a/modular.json b/modular.json new file mode 100644 index 0000000..0dd1901 --- /dev/null +++ b/modular.json @@ -0,0 +1,10 @@ +{ + "cmake": { + "inc_dirs": [ + "./" + ], + "srcs": [ + "./**.c" + ] + } +} \ No newline at end of file