mirror of
https://github.com/fumiama/base16384.git
synced 2026-06-08 04:00:25 +08:00
feat: add param -n -t & optimize param parsing & tidy documents
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源文雨
145
base1464.c
145
base1464.c
@@ -1,6 +1,6 @@
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/* base1464.c
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* This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
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* Copyright (c) 2022-2023 Fumiama Minamoto.
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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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@@ -16,51 +16,7 @@
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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 <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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# define be64toh(x) betoh64(x)
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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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# define be64toh(x) ntohll(x)
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# define htobe16(x) ntohs(x)
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# define htobe32(x) htonl(x)
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# define htobe64(x) htonll(x)
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#endif
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#ifdef _WIN64
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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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# define be64toh(x) (x)
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# define htobe16(x) (x)
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# define htobe32(x) (x)
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# define htobe64(x) (x)
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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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# define be64toh(x) _byteswap_uint64(x)
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# define htobe16(x) _byteswap_ushort(x)
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# define htobe32(x) _byteswap_ulong(x)
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# define htobe64(x) _byteswap_uint64(x)
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#endif
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#endif
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// #define DEBUG
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#include "binary.h"
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int base16384_encode(const char* data, int dlen, char* buf) {
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int outlen = dlen / 7 * 8;
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@@ -136,6 +92,48 @@ int base16384_encode(const char* data, int dlen, char* buf) {
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return outlen;
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}
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int base16384_encode_unsafe(const char* data, int dlen, char* buf) {
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int outlen = dlen / 7 * 8;
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int offset = dlen % 7;
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switch(offset) { // 算上偏移标志字符占用的2字节
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case 0: break;
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case 1: outlen += 4; break;
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case 2:
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case 3: outlen += 6; break;
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case 4:
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case 5: outlen += 8; break;
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case 6: outlen += 10; break;
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default: break;
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}
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#ifdef DEBUG
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printf("outlen: %llu, offset: %u, malloc: %llu\n", outlen, offset, outlen + 8);
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#endif
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uint64_t* vals = (uint64_t*)buf;
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uint64_t n = 0;
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int64_t i = 0;
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for(; i < dlen; i += 7) {
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register uint64_t sum = 0;
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register uint64_t shift = htobe64(*(uint64_t*)(data+i))>>2; // 这里有读取越界
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sum |= shift & 0x3fff000000000000;
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shift >>= 2;
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sum |= shift & 0x00003fff00000000;
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shift >>= 2;
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sum |= shift & 0x000000003fff0000;
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shift >>= 2;
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sum |= shift & 0x0000000000003fff;
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sum += 0x4e004e004e004e00;
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vals[n++] = be64toh(sum);
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#ifdef DEBUG
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printf("i: %llu, add sum: %016llx\n", i, sum);
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#endif
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}
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if(offset) {
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buf[outlen - 2] = '=';
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buf[outlen - 1] = offset;
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}
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return outlen;
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}
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int base16384_decode(const char* data, int dlen, char* buf) {
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int outlen = dlen;
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int offset = 0;
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@@ -201,3 +199,58 @@ int base16384_decode(const char* data, int dlen, char* buf) {
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}
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return outlen;
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}
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int base16384_decode_unsafe(const char* data, int dlen, char* buf) {
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int outlen = dlen;
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int offset = 0;
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if(data[dlen-2] == '=') {
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offset = data[dlen-1];
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switch(offset) { // 算上偏移标志字符占用的2字节
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case 0: break;
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case 1: outlen -= 4; break;
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case 2:
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case 3: outlen -= 6; break;
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case 4:
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case 5: outlen -= 8; break;
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case 6: outlen -= 10; break;
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default: break;
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}
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}
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outlen = outlen / 8 * 7 + offset;
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uint64_t* vals = (uint64_t*)data;
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uint64_t n = 0;
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int64_t i = 0;
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for(; i < outlen-7; n++, i+=7) {
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register uint64_t sum = 0;
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register uint64_t shift = htobe64(vals[n]) - 0x4e004e004e004e00;
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shift <<= 2;
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sum |= shift & 0xfffc000000000000;
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shift <<= 2;
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sum |= shift & 0x0003fff000000000;
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shift <<= 2;
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sum |= shift & 0x0000000fffc00000;
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shift <<= 2;
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sum |= shift & 0x00000000003fff00;
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*(uint64_t*)(buf+i) = be64toh(sum);
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#ifdef DEBUG
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printf("i: %llu, add sum: %016llx\n", i, sum);
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#endif
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}
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register uint64_t sum = 0;
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register uint64_t shift = htobe64(vals[n]);
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if(((shift>>56)&0xff) < 0x4e) shift |= 0xff00000000000000;
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if(((shift>>40)&0xff) < 0x4e) shift |= 0x0000ff0000000000;
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if(((shift>>24)&0xff) < 0x4e) shift |= 0x00000000ff000000;
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if(((shift>> 8)&0xff) < 0x4e) shift |= 0x000000000000ff00;
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shift -= 0x4e004e004e004e00;
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shift <<= 2;
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sum |= shift & 0xfffc000000000000;
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shift <<= 2;
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sum |= shift & 0x0003fff000000000;
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shift <<= 2;
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sum |= shift & 0x0000000fffc00000;
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shift <<= 2;
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sum |= shift & 0x00000000003fff00;
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*(uint64_t*)(buf+i) = be64toh(sum);
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return outlen;
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}
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