56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Copyright (c) Souldbminer, Lightos_ and Horizon OC Contributors
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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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*/
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#pragma once
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#include <stdio.h>
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#include <stdint.h>
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uint32_t crc32(const uint8_t *data, size_t length) {
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uint32_t crc = 0xFFFFFFFF;
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for (size_t i = 0; i < length; i++) {
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crc ^= data[i];
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for (int j = 0; j < 8; j++) {
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crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
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}
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}
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return ~crc;
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}
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uint32_t checksum_file(const char *filename) {
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FILE *file = fopen(filename, "rb");
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if (!file) {
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perror("[crc32] Error opening file");
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return 0;
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}
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uint8_t buffer[1024];
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uint32_t crc = 0xFFFFFFFF;
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size_t bytes_read;
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while ((bytes_read = fread(buffer, 1, sizeof(buffer), file)) > 0) {
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for (size_t i = 0; i < bytes_read; i++) {
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crc ^= buffer[i];
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for (int j = 0; j < 8; j++) {
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crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
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}
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}
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}
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fclose(file);
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return ~crc;
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} |