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
152
base1432.c
152
base1432.c
@@ -1,6 +1,6 @@
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/* base1432.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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#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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#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 htobe16(x) ntohs(x)
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# define htobe32(x) htonl(x)
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#endif
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#ifdef _WIN32
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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 htobe16(x) (x)
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# define htobe32(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 htobe16(x) _byteswap_ushort(x)
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# define htobe32(x) _byteswap_ulong(x)
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#endif
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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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@@ -140,6 +96,49 @@ 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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uint32_t* vals = (uint32_t*)buf;
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uint32_t n = 0;
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int32_t i = 0;
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for(; i < dlen; i += 7) {
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register uint32_t sum = 0;
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register uint32_t shift = htobe32(*(uint32_t*)(data+i));
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sum |= (shift>>2) & 0x3fff0000;
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sum |= (shift>>4) & 0x00003fff;
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sum += 0x4e004e00;
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vals[n++] = be32toh(sum);
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shift <<= 26;
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shift &= 0x3c000000;
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sum = 0;
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shift |= (htobe32(*(uint32_t*)(data+i+4))>>6)&0x03fffffc;
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sum |= shift & 0x3fff0000;
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shift >>= 2;
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sum |= shift & 0x00003fff;
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sum += 0x4e004e00;
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vals[n++] = be32toh(sum);
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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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@@ -214,3 +213,64 @@ 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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uint32_t* vals = (uint32_t*)data;
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uint32_t n = 0;
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int32_t i = 0;
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for(; i < outlen-7; i+=7) { // n实际每次自增2
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register uint32_t sum = 0;
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register uint32_t shift = htobe32(vals[n++]) - 0x4e004e00;
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shift <<= 2;
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sum |= shift & 0xfffc0000;
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shift <<= 2;
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sum |= shift & 0x0003fff0;
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shift = htobe32(vals[n++]) - 0x4e004e00;
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sum |= shift >> 26;
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*(uint32_t*)(buf+i) = be32toh(sum);
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sum = 0;
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shift <<= 6;
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sum |= shift & 0xffc00000;
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shift <<= 2;
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sum |= shift & 0x003fff00;
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*(uint32_t*)(buf+i+4) = be32toh(sum);
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}
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register uint32_t sum = 0;
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register uint32_t shift = htobe32(vals[n++]);
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if(((shift>>24)&0xff) < 0x4e) shift |= 0xff000000;
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if(((shift>> 8)&0xff) < 0x4e) shift |= 0x0000ff00;
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shift -= 0x4e004e00;
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shift <<= 2;
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sum |= shift & 0xfffc0000;
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shift <<= 2;
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sum |= shift & 0x0003fff0;
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shift = htobe32(vals[n++]);
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if(((shift>>24)&0xff) < 0x4e) shift |= 0xff000000;
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if(((shift>> 8)&0xff) < 0x4e) shift |= 0x0000ff00;
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shift -= 0x4e004e00;
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sum |= shift >> 26;
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*(uint32_t*)(buf+i) = be32toh(sum);
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sum = 0;
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shift <<= 6;
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sum |= shift & 0xffc00000;
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shift <<= 2;
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sum |= shift & 0x003fff00;
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*(uint32_t*)(buf+i+4) = be32toh(sum);
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return outlen;
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}
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