99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
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* Library: libjamcrc
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* File: src/plugin_jamcrc.c
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* Original Author: Lammert Bies
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* Plugin Author: Syping
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*
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* This file is licensed under the MIT License as stated below
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*
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* Copyright (c) 1999-2016 Lammert Bies
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* Copyright (c) 2020 Syping
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdbool.h>
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#include "checksum.h"
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static void init_crc32_tab(void);
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static bool crc_tab32_init = false;
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static uint32_t crc_tab32[256];
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static void init_crc32_tab(void) {
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uint32_t i;
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uint32_t j;
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uint32_t crc;
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for (i = 0; i < 256; i++) {
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crc = i;
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for (j = 0; j < 8; j++) {
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if (crc & 0x00000001L) {
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crc = (crc >> 1) ^ CRC_POLY_32;
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}
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else {
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crc = crc >> 1;
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}
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}
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crc_tab32[i] = crc;
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}
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crc_tab32_init = true;
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}
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const char* checkbrute_format()
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{
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return "JAMCRC";
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}
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const char* checkbrute_version()
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{
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return "0.1";
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}
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uint32_t checkbrute_hash32(unsigned char* data, size_t size)
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{
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uint32_t crc;
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uint32_t tmp;
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uint32_t long_c;
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const unsigned char *ptr;
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size_t a;
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if (!crc_tab32_init)
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init_crc32_tab();
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crc = CRC_START_32;
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ptr = data;
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if (ptr != NULL)
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for (a = 0; a < size; a++) {
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long_c = 0x000000FFL & (uint32_t)*ptr;
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tmp = crc ^ long_c;
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crc = (crc >> 8) ^ crc_tab32[tmp & 0xff];
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ptr++;
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}
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crc ^= 0x00000000L;
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return crc & 0xffffffffL;
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}
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int checkbrute_hashsz()
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{
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return 4;
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}
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