From c3b0fa04a663fe233765b83d3be41a42aa08c25d Mon Sep 17 00:00:00 2001 From: "Juan J. Martinez" Date: Mon, 3 May 2021 08:21:10 +0100 Subject: Initial import for public release --- tools/hex2bin-2.0/src/libcrc.c | 204 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 204 insertions(+) create mode 100644 tools/hex2bin-2.0/src/libcrc.c (limited to 'tools/hex2bin-2.0/src/libcrc.c') diff --git a/tools/hex2bin-2.0/src/libcrc.c b/tools/hex2bin-2.0/src/libcrc.c new file mode 100644 index 0000000..02bcd4b --- /dev/null +++ b/tools/hex2bin-2.0/src/libcrc.c @@ -0,0 +1,204 @@ +/********************************************************************* + * * + * Library : lib_crc * + * File : lib_crc.c * + * Author : Lammert Bies 1999-2008 * + * E-mail : info@lammertbies.nl * + * Language : ANSI C * + * * + * * + * Description * + * =========== * + * * + * The file lib_crc.c contains the private and public func- * + * tions used for the calculation of CRC-16, CRC-CCITT and * + * CRC-32 cyclic redundancy values. * + * * + * * + * Dependencies * + * ============ * + * * + * libcrc.h CRC definitions and prototypes * + * * + ********************************************************************/ +#include + +#ifndef G_GUINT64_CONSTANT +#define G_GUINT64_CONSTANT(val) (val##UL) +#endif + +void *crc_table; + +/* private */ + +void init_crc8_normal_tab(uint8_t polynom) +{ + int i, j; + uint8_t crc; + uint8_t *p; + + p = (uint8_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = (uint8_t) i; + + for (j=0; j<8; j++) + { + if (crc & 0x80) crc = (crc << 1) ^ polynom; + else crc <<= 1; + } + *p++ = crc; + } +} + +void init_crc8_reflected_tab(uint8_t polynom) +{ + int i, j; + uint8_t crc; + uint8_t *p; + + p = (uint8_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = (uint8_t) i; + + for (j=0; j<8; j++) + { + if (crc & 0x01) crc = (crc >> 1) ^ polynom; + else crc >>= 1; + } + *p++ = crc; + } +} + +/* Common routines for calculations */ +void init_crc16_normal_tab(uint16_t polynom) +{ + int i, j; + uint16_t crc; + uint16_t *p; + + p = (uint16_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = ((uint16_t) i) << 8; + + for (j=0; j<8; j++) + { + if ( crc & 0x8000 ) crc = ( crc << 1 ) ^ polynom; + else crc <<= 1; + } + *p++ = crc; + } +} + +void init_crc16_reflected_tab(uint16_t polynom) +{ + int i, j; + uint16_t crc; + uint16_t *p; + + p = (uint16_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = (uint16_t) i; + + for (j=0; j<8; j++) + { + if ( crc & 0x0001 ) crc = ( crc >> 1 ) ^ polynom; + else crc >>= 1; + } + *p++ = crc; + } +} + +void init_crc32_normal_tab(uint32_t polynom) +{ + int i, j; + uint32_t crc; + uint32_t *p; + + p = (uint32_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = ((uint32_t) i) << 24; + + for (j=0; j<8; j++) + { + if ( crc & 0x80000000L ) crc = ( crc << 1 ) ^ polynom; + else crc <<= 1; + } + *p++ = crc; + } +} + +void init_crc32_reflected_tab(uint32_t polynom) +{ + int i, j; + uint32_t crc; + uint32_t *p; + + p = (uint32_t *) crc_table; + + for (i=0; i<256; i++) + { + crc = (uint32_t) i; + + for (j=0; j<8; j++) + { + if ( crc & 0x00000001L ) crc = ( crc >> 1 ) ^ polynom; + else crc >>= 1; + } + *p++ = crc; + } +} + +/* Common routines for calculations */ + +uint8_t update_crc8(uint8_t crc, uint8_t c) +{ + return (((uint8_t *) crc_table)[crc ^ c]); +} + +uint16_t update_crc16_normal(uint16_t crc, char c ) +{ + uint16_t short_c; + + short_c = 0x00ff & (uint16_t) c; + + /* Normal form */ + return (crc << 8) ^ ((uint16_t *) crc_table)[(crc >> 8) ^ short_c]; +} + +uint16_t update_crc16_reflected(uint16_t crc, char c ) +{ + uint16_t short_c; + + short_c = 0x00ff & (uint16_t) c; + + /* Reflected form */ + return (crc >> 8) ^ ((uint16_t *) crc_table)[(crc ^ short_c) & 0xff]; +} + +uint32_t update_crc32_normal(uint32_t crc, char c ) +{ + uint32_t long_c; + + long_c = 0x000000ffL & (uint32_t) c; + + return (crc << 8) ^ ((uint32_t *) crc_table)[((crc >> 24) ^ long_c) & 0xff]; +} + +uint32_t update_crc32_reflected(uint32_t crc, char c ) +{ + uint32_t long_c; + + long_c = 0x000000ffL & (uint32_t) c; + + return (crc >> 8) ^ ((uint32_t *) crc_table)[(crc ^ long_c) & 0xff]; +} -- cgit v1.2.3