Implement first draft of CRC core
This commit is contained in:
parent
9ee80cc8f7
commit
8f19470db3
@ -9,6 +9,7 @@ set (CFILES
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main.c
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version.c
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named_crcs.c
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crc.c
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)
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set(GEN_HEADER_PATH "${CMAKE_CURRENT_BINARY_DIR}/include/generated")
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161
crc.c
Normal file
161
crc.c
Normal file
@ -0,0 +1,161 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 only.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <patchelfcrc/crc.h>
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#include <stdlib.h>
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#include <string.h>
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int crc_len_from_poly(uint64_t polynomial)
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{
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int pos = 0;
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/* Extract the MSB from the polynomial */
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for (pos = 63; pos >= 0; pos--) {
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if (polynomial & (((uint64_t)1ULL) << pos)) {
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/* Highest bit found */
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break;
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}
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}
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return pos;
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}
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static uint64_t shorten_polynomial(uint64_t poly)
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{
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int i;
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for (i = 31; i <= 0; i--) {
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if (poly & (1 << i)) {
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poly &= ~(1<<i);
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break;
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}
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}
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return poly;
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}
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static void internal_push_byte(struct crc_calc *crc, const uint8_t *data, size_t len)
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{
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size_t i;
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uint32_t crc_val;
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crc_val = crc->crc_val;
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for (i = 0; i < len; i++, data++) {
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crc_val = ((crc_val << 8) & crc->crc_mask) ^ crc->table[((crc_val >> (crc->crc_length-8u)) & 0xff) ^ *data];
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}
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crc->crc_val = crc_val;
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}
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static void fill_crc_table(struct crc_calc *crc)
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{
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uint32_t input;
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uint32_t crc_reg;
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uint32_t short_poly;
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uint32_t crc_len;
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int i;
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crc_len = crc->crc_length;
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short_poly = (uint32_t)shorten_polynomial(crc->settings.polynomial);
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for (input = 0; input <= 255u; input++) {
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crc_reg = ((uint8_t)input) << (crc_len - 8u);
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for (i = 7; i >= 0; i--) {
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if (crc_reg & (1ul << (crc_len-1))) {
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crc_reg <<= 1;
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crc_reg ^= short_poly;
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} else {
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crc_reg <<= 1;
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}
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}
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crc->table[input] = crc_reg;
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}
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}
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void crc_init(struct crc_calc *crc, const struct crc_settings *settings)
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{
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uint32_t i;
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if (!crc || !settings)
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return;
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memcpy(&crc->settings, settings, sizeof(struct crc_settings));
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crc->table = (uint32_t *)malloc(256 * sizeof(uint32_t));
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crc->crc_length = crc_len_from_poly(crc->settings.polynomial);
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crc->crc_val = settings->start_value;
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crc->crc_mask = 0x0UL;
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for (i = 0; i < crc->crc_length; i++)
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crc->crc_mask |= (1ul << i);
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/* Initialize the table */
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fill_crc_table(crc);
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}
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void crc_push_bytes(struct crc_calc *crc, const uint8_t *b, size_t len)
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{
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if (!crc)
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return;
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internal_push_byte(crc, b, len);
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}
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void crc_push_byte(struct crc_calc *crc, uint8_t b)
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{
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if (!crc)
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return;
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internal_push_byte(crc, &b, 1ul);
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}
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void crc_destroy(struct crc_calc *crc)
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{
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if (!crc)
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return;
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if (crc->table)
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free(crc->table);
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}
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uint32_t crc_get_value(struct crc_calc *crc)
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{
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return crc->crc_val;
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}
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void crc_finish_calc(struct crc_calc *crc)
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{
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uint32_t val;
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uint32_t i;
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if (!crc)
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return;
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crc->crc_val ^= crc->settings.xor;
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val = crc->crc_val;
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if (crc->settings.rev) {
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crc->crc_val = 0x0ul;
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for (i = 0; i < crc->crc_length; i++) {
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if (val & (1<<(crc->crc_length - i - 1))) {
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crc->crc_val |= (1 << i);
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}
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}
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}
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}
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54
include/patchelfcrc/crc.h
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54
include/patchelfcrc/crc.h
Normal file
@ -0,0 +1,54 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 only.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _CRC_H_
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#define _CRC_H_
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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struct crc_settings {
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uint64_t polynomial;
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uint32_t xor;
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uint32_t start_value;
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bool rev;
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};
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struct crc_calc {
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struct crc_settings settings;
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uint32_t crc_val;
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uint32_t crc_mask;
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uint32_t crc_length;
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uint32_t *table;
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};
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int crc_len_from_poly(uint64_t polynomial);
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void crc_init(struct crc_calc *crc, const struct crc_settings *settings);
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void crc_destroy(struct crc_calc *crc);
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void crc_push_byte(struct crc_calc *crc, uint8_t b);
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void crc_push_bytes(struct crc_calc *crc, const uint8_t *b, size_t len);
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void crc_finish_calc(struct crc_calc *crc);
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uint32_t crc_get_value(struct crc_calc *crc);
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#endif /* _CRC_H_ */
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@ -1,15 +1,26 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 only.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _NAMED_CRCS_H_
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#define _NAMED_CRCS_H_
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#include <stdint.h>
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#include <stdbool.h>
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struct crc_settings {
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uint32_t polynomial;
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uint32_t xor;
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uint32_t start_value;
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bool rev;
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};
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#include <patchelfcrc/crc.h>
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struct named_crc {
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const char *name;
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@ -1,3 +1,20 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 only.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _VERSION_H_
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#define _VERSION_H_
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39
main.c
39
main.c
@ -1,3 +1,20 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 only.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <libelf.h>
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#include <argp.h>
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@ -5,6 +22,7 @@
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#include <string.h>
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#include <stdlib.h>
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#include <patchelfcrc/named_crcs.h>
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#include <patchelfcrc/crc.h>
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#include <patchelfcrc/version.h>
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#include <linklist-lib/singly-linked-list.h>
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@ -51,6 +69,8 @@ struct command_line_options {
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static error_t parse_opt(int key, char *arg, struct argp_state *state)
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{
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struct command_line_options *args = (struct command_line_options *)state->input;
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char *endptr;
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switch (key) {
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case ARG_KEY_DRY_RUN:
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args->dry_run = true;
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@ -67,6 +87,13 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state)
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case ARG_KEY_LIST:
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args->list = true;
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break;
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case 'p':
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/* Polyniomial */
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args->crc.polynomial = strtoull(arg, &endptr, 0);
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if (endptr == arg) {
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argp_error(state, "Error parsing polynomial: %s\n", arg);
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}
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break;
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case 'l':
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args->little_endian = true;
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break;
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@ -140,7 +167,7 @@ static void prepare_default_opts(struct command_line_options *opts)
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opts->granularity = GRANULARITY_BYTE;
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opts->dry_run = false;
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opts->crc.xor = 0UL;
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opts->crc.polynomial = 0x04C11DB7UL;
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opts->crc.polynomial = 0x104C11DB7UL;
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opts->crc.start_value = 0xFFFFFFFFUL;
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opts->crc.rev = false;
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opts->format = FORMAT_BARE;
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@ -169,6 +196,12 @@ static void print_verbose_start_info(const struct command_line_options *cmd_opts
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predef_crc = reverse_lookup_named_crc(&cmd_opts->crc);
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if (predef_crc) {
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print_debug("Predefined CRC detected: %s\n", predef_crc->name);
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} else {
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print_debug("Generator polynomial: 0x%lx\n", cmd_opts->crc.polynomial);
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print_debug("Start value: 0x%x\n", cmd_opts->crc.start_value);
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print_debug("Output XOR: 0x%x\n", cmd_opts->crc.xor);
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print_debug("Reversed: %s\n", cmd_opts->crc.rev ? "yes" : "no");
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print_debug("CRC length: %d\n", crc_len_from_poly(cmd_opts->crc.polynomial));
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}
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if (cmd_opts->section_list) {
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@ -197,6 +230,7 @@ static void free_cmd_args(struct command_line_options *opts)
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int main(int argc, char **argv)
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{
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bool verbose;
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struct crc_calc crc;
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struct command_line_options cmd_opts;
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prepare_default_opts(&cmd_opts);
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@ -209,6 +243,9 @@ int main(int argc, char **argv)
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list_predefined_crcs();
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goto free_cmds;
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}
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/* Build the CRC */
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crc_init(&crc, &cmd_opts.crc);
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free_cmds:
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free_cmd_args(&cmd_opts);
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95
named_crcs.c
95
named_crcs.c
@ -1,3 +1,20 @@
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/*
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* This file is part of patchelfcrc .
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* Copyright (c) 2022 Mario Hüttel.
|
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*
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* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, version 2 only.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
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*/
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#include <patchelfcrc/named_crcs.h>
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#include <stddef.h>
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#include <string.h>
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@ -14,44 +31,44 @@
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}}
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const struct named_crc predefined_crc_table[] = {
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NAMED_CRC("crc-8", 0x07, false, 0x00, 0x00),
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NAMED_CRC("crc-8-darc", 0x39, true, 0x00, 0x00),
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NAMED_CRC("crc-8-i-code", 0x1D, false, 0xFD, 0x00),
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NAMED_CRC("crc-8-itu", 0x07, false, 0x55, 0x55),
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NAMED_CRC("crc-8-maxim", 0x31, true, 0x00, 0x00),
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NAMED_CRC("crc-8-rohc", 0x07, true, 0xFF, 0x00),
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NAMED_CRC("crc-8-wcdma", 0x9B, true, 0x00, 0x00),
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NAMED_CRC("crc-16", 0x8005, true, 0x0000, 0x0000),
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NAMED_CRC("crc-16-buypass", 0x8005, false, 0x0000, 0x0000),
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NAMED_CRC("crc-16-dds-110", 0x8005, false, 0x800D, 0x0000),
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NAMED_CRC("crc-16-dect", 0x0589, false, 0x0001, 0x0001),
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NAMED_CRC("crc-16-dnp", 0x3D65, true, 0xFFFF, 0xFFFF),
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NAMED_CRC("crc-16-en-13757", 0x3D65, false, 0xFFFF, 0xFFFF),
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NAMED_CRC("crc-16-genibus", 0x1021, false, 0x0000, 0xFFFF),
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NAMED_CRC("crc-16-maxim", 0x8005, true, 0xFFFF, 0xFFFF),
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NAMED_CRC("crc-16-mcrf4xx", 0x1021, true, 0xFFFF, 0x0000),
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NAMED_CRC("crc-16-riello", 0x1021, true, 0x554D, 0x0000),
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NAMED_CRC("crc-16-t10-dif", 0x8BB7, false, 0x0000, 0x0000),
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NAMED_CRC("crc-16-teledisk", 0xA097, false, 0x0000, 0x0000),
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NAMED_CRC("crc-16-usb", 0x8005, true, 0x0000, 0xFFFF),
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NAMED_CRC("x-25", 0x1021, true, 0x0000, 0xFFFF),
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NAMED_CRC("xmodem", 0x1021, false, 0x0000, 0x0000),
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NAMED_CRC("modbus", 0x8005, true, 0xFFFF, 0x0000),
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NAMED_CRC("kermit", 0x1021, true, 0x0000, 0x0000),
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NAMED_CRC("crc-ccitt-false", 0x1021, false, 0xFFFF, 0x0000),
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NAMED_CRC("crc-aug-ccitt", 0x1021, false, 0x1D0F, 0x0000),
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NAMED_CRC("crc-24", 0x864CFB, false, 0xB704CE, 0x000000),
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NAMED_CRC("crc-24-flexray-a", 0x5D6DCB, false, 0xFEDCBA, 0x000000),
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NAMED_CRC("crc-24-flexray-b", 0x5D6DCB, false, 0xABCDEF, 0x000000),
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NAMED_CRC("crc-32", 0x04C11DB7, true, 0x00000000, 0xFFFFFFFF),
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NAMED_CRC("crc-32-bzip2", 0x04C11DB7, false, 0x00000000, 0xFFFFFFFF),
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NAMED_CRC("crc-32c", 0x1EDC6F41, true, 0x00000000, 0xFFFFFFFF),
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NAMED_CRC("crc-32d", 0xA833982B, true, 0x00000000, 0xFFFFFFFF),
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NAMED_CRC("crc-32-mpeg", 0x04C11DB7, false, 0xFFFFFFFF, 0x00000000),
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||||
NAMED_CRC("posix", 0x04C11DB7, false, 0xFFFFFFFF, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32q", 0x814141AB, false, 0x00000000, 0x00000000),
|
||||
NAMED_CRC("jamcrc", 0x04C11DB7, true, 0xFFFFFFFF, 0x00000000),
|
||||
NAMED_CRC("xfer", 0x000000AF, false, 0x00000000, 0x00000000),
|
||||
NAMED_CRC("crc-8", 0x107, false, 0x00, 0x00),
|
||||
NAMED_CRC("crc-8-darc", 0x139, true, 0x00, 0x00),
|
||||
NAMED_CRC("crc-8-i-code", 0x11D, false, 0xFD, 0x00),
|
||||
NAMED_CRC("crc-8-itu", 0x107, false, 0x55, 0x55),
|
||||
NAMED_CRC("crc-8-maxim", 0x131, true, 0x00, 0x00),
|
||||
NAMED_CRC("crc-8-rohc", 0x107, true, 0xFF, 0x00),
|
||||
NAMED_CRC("crc-8-wcdma", 0x19B, true, 0x00, 0x00),
|
||||
NAMED_CRC("crc-16", 0x18005, true, 0x0000, 0x0000),
|
||||
NAMED_CRC("crc-16-buypass", 0x18005, false, 0x0000, 0x0000),
|
||||
NAMED_CRC("crc-16-dds-110", 0x18005, false, 0x800D, 0x0000),
|
||||
NAMED_CRC("crc-16-dect", 0x10589, false, 0x0001, 0x0001),
|
||||
NAMED_CRC("crc-16-dnp", 0x13D65, true, 0xFFFF, 0xFFFF),
|
||||
NAMED_CRC("crc-16-en-13757", 0x13D65, false, 0xFFFF, 0xFFFF),
|
||||
NAMED_CRC("crc-16-genibus", 0x11021, false, 0x0000, 0xFFFF),
|
||||
NAMED_CRC("crc-16-maxim", 0x18005, true, 0xFFFF, 0xFFFF),
|
||||
NAMED_CRC("crc-16-mcrf4xx", 0x11021, true, 0xFFFF, 0x0000),
|
||||
NAMED_CRC("crc-16-riello", 0x11021, true, 0x554D, 0x0000),
|
||||
NAMED_CRC("crc-16-t10-dif", 0x18BB7, false, 0x0000, 0x0000),
|
||||
NAMED_CRC("crc-16-teledisk", 0x1A097, false, 0x0000, 0x0000),
|
||||
NAMED_CRC("crc-16-usb", 0x18005, true, 0x0000, 0xFFFF),
|
||||
NAMED_CRC("x-25", 0x11021, true, 0x0000, 0xFFFF),
|
||||
NAMED_CRC("xmodem", 0x11021, false, 0x0000, 0x0000),
|
||||
NAMED_CRC("modbus", 0x18005, true, 0xFFFF, 0x0000),
|
||||
NAMED_CRC("kermit", 0x11021, true, 0x0000, 0x0000),
|
||||
NAMED_CRC("crc-ccitt-false", 0x11021, false, 0xFFFF, 0x0000),
|
||||
NAMED_CRC("crc-aug-ccitt", 0x11021, false, 0x1D0F, 0x0000),
|
||||
NAMED_CRC("crc-24", 0x1864CFB, false, 0xB704CE, 0x000000),
|
||||
NAMED_CRC("crc-24-flexray-a", 0x15D6DCB, false, 0xFEDCBA, 0x000000),
|
||||
NAMED_CRC("crc-24-flexray-b", 0x15D6DCB, false, 0xABCDEF, 0x000000),
|
||||
NAMED_CRC("crc-32", 0x104C11DB7, true, 0x00000000, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32-bzip2", 0x104C11DB7, false, 0x00000000, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32c", 0x11EDC6F41, true, 0x00000000, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32d", 0x1A833982B, true, 0x00000000, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32-mpeg", 0x104C11DB7, false, 0xFFFFFFFF, 0x00000000),
|
||||
NAMED_CRC("posix", 0x104C11DB7, false, 0xFFFFFFFF, 0xFFFFFFFF),
|
||||
NAMED_CRC("crc-32q", 0x1814141AB, false, 0x00000000, 0x00000000),
|
||||
NAMED_CRC("jamcrc", 0x104C11DB7, true, 0xFFFFFFFF, 0x00000000),
|
||||
NAMED_CRC("xfer", 0x1000000AF, false, 0x00000000, 0x00000000),
|
||||
/* SENTINEL */
|
||||
{.name = NULL, .settings = {0, 0, 0, false}},
|
||||
};
|
||||
@ -100,7 +117,7 @@ void list_predefined_crcs(void)
|
||||
ft_write_ln(table, "Name", "Polynomial", "Reversed", "Start Value", "Output XOR");
|
||||
|
||||
for (iter = predefined_crc_table; iter->name; iter++) {
|
||||
ft_printf_ln(table, "%s|0x%x|%s|0x%x|0x%x",
|
||||
ft_printf_ln(table, "%s|0x%lx|%s|0x%x|0x%x",
|
||||
iter->name,
|
||||
iter->settings.polynomial,
|
||||
iter->settings.rev ? "yes" : "no",
|
||||
|
||||
17
version.c
17
version.c
@ -1,3 +1,20 @@
|
||||
/*
|
||||
* This file is part of patchelfcrc .
|
||||
* Copyright (c) 2022 Mario Hüttel.
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, version 2 only.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <patchelfcrc/version.h>
|
||||
#include <generated/version.h>
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user