mirror of
https://github.com/fumiama/base16384.git
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121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
#ifndef _BINARY_H_
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#define _BINARY_H_
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/* binary.h
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* This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
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* Copyright (c) 2022-2024 Fumiama Minamoto.
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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; either version 3 of the License, or
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* (at your option) any later version.
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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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#ifdef __cosmopolitan // always le
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#define be16toh(x) bswap_16(x)
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#define be32toh(x) bswap_32(x)
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#define htobe16(x) bswap_16(x)
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#define htobe32(x) bswap_32(x)
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#else
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#ifdef __linux__
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#include <endian.h>
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#endif
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#ifdef __FreeBSD__
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#include <sys/endian.h>
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#endif
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#ifdef __NetBSD__
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#include <sys/endian.h>
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#endif
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#ifdef __OpenBSD__
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#include <sys/types.h>
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#define be16toh(x) betoh16(x)
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#define be32toh(x) betoh32(x)
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#ifdef IS_64BIT_PROCESSOR
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#define be64toh(x) betoh64(x)
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#endif
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#endif
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#ifdef __APPLE__
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#define be16toh(x) ntohs(x)
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#define be32toh(x) ntohl(x)
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#ifdef IS_64BIT_PROCESSOR
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#define be64toh(x) ntohll(x)
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#endif
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#define htobe16(x) htons(x)
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#define htobe32(x) htonl(x)
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#ifdef IS_64BIT_PROCESSOR
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#define htobe64(x) htonll(x)
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#endif
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#endif
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#ifdef _MSC_VER
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#ifdef WORDS_BIGENDIAN
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#define be16toh(x) (x)
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#define be32toh(x) (x)
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#ifdef IS_64BIT_PROCESSOR
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#define be64toh(x) (x)
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#endif
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#define htobe16(x) (x)
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#define htobe32(x) (x)
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#ifdef IS_64BIT_PROCESSOR
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#define htobe64(x) (x)
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#endif
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#else
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#define be16toh(x) _byteswap_ushort(x)
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#define be32toh(x) _byteswap_ulong(x)
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#ifdef IS_64BIT_PROCESSOR
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#define be64toh(x) _byteswap_uint64(x)
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#endif
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#define htobe16(x) _byteswap_ushort(x)
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#define htobe32(x) _byteswap_ulong(x)
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#ifdef IS_64BIT_PROCESSOR
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#define htobe64(x) _byteswap_uint64(x)
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#endif
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#endif
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#endif
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#endif
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// leftrotate function definition
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#define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (sizeof(x)*8 - (c))))
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static inline uint32_t calc_sum(uint32_t sum, size_t cnt, const char* encbuf) {
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size_t i;
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uint32_t buf;
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for(i = 0; i < cnt; i++) {
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buf = (uint32_t)(encbuf[i])&0xff;
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buf = ((buf<<(24-6))&0x03000000) | ((buf<<(16-4))&0x00030000) | ((buf<<(8-2))&0x00000300) | (buf&0x03);
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sum += buf;
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sum = ~LEFTROTATE(sum, 3);
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}
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return sum;
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}
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static inline uint32_t calc_and_embed_sum(uint32_t sum, size_t cnt, char* encbuf) {
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sum = calc_sum(sum, cnt, encbuf);
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if(cnt%7) { // last encode
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*(uint32_t*)(&encbuf[cnt]) = htobe32(sum);
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}
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return sum;
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}
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static inline int check_sum(uint32_t sum, uint32_t sum_read_raw, int offset) {
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int shift = (int[]){0, 26, 20, 28, 22, 30, 24}[offset%7];
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uint32_t sum_read = be32toh(sum_read_raw) >> shift;
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sum >>= shift;
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#ifdef DEBUG
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fprintf(stderr, "offset: %d, mysum: %08x, sumrd: %08x\n", offset, sum, sum_read);
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#endif
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return sum != sum_read;
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}
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#endif
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