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https://github.com/fumiama/base16384.git
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new no-malloc api
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源文雨
187
base1464.c
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187
base1464.c
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@@ -0,0 +1,187 @@
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// base1464.c
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// fumiama 20211029
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#include <stdio.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 __MAC_10_0
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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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#include "base14.h"
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// #define DEBUG
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int encode(const char* data, int dlen, char* buf, int blen) {
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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 - 7; 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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int o = offset;
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if(o--) {
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register uint64_t sum = 0x000000000000003f & (data[i] >> 2);
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sum |= ((uint64_t)data[i] << 14) & 0x000000000000c000;
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if(o--) {
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sum |= ((uint64_t)data[i + 1] << 6) & 0x0000000000003f00;
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sum |= ((uint64_t)data[i + 1] << 20) & 0x0000000000300000;
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if(o--) {
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sum |= ((uint64_t)data[i + 2] << 12) & 0x00000000000f0000;
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sum |= ((uint64_t)data[i + 2] << 28) & 0x00000000f0000000;
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if(o--) {
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sum |= ((uint64_t)data[i + 3] << 20) & 0x000000000f000000;
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sum |= ((uint64_t)data[i + 3] << 34) & 0x0000003c00000000;
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if(o--) {
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sum |= ((uint64_t)data[i + 4] << 26) & 0x0000000300000000;
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sum |= ((uint64_t)data[i + 4] << 42) & 0x0000fc0000000000;
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if(o--) {
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sum |= ((uint64_t)data[i + 5] << 34) & 0x0000030000000000;
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sum |= ((uint64_t)data[i + 5] << 48) & 0x003f000000000000;
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}
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}
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}
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}
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}
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sum += 0x004e004e004e004e;
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#ifdef WORDS_BIGENDIAN
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vals[n] = __builtin_bswap64(sum);
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#else
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vals[n] = sum;
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#endif
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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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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 decode(const char* data, int dlen, char* buf, int blen) {
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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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if(offset--) {
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// 这里有读取越界
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#ifdef WORDS_BIGENDIAN
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register uint64_t sum = __builtin_bswap64(vals[n]) - 0x000000000000004e;
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#else
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register uint64_t sum = vals[n] - 0x000000000000004e;
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#endif
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buf[i++] = ((sum & 0x000000000000003f) << 2) | ((sum & 0x000000000000c000) >> 14);
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if(offset--) {
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sum -= 0x00000000004e0000;
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buf[i++] = ((sum & 0x0000000000003f00) >> 6) | ((sum & 0x0000000000300000) >> 20);
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if(offset--) {
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buf[i++] = ((sum & 0x00000000000f0000) >> 12) | ((sum & 0x00000000f0000000) >> 28);
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if(offset--) {
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sum -= 0x0000004e00000000;
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buf[i++] = ((sum & 0x000000000f000000) >> 20) | ((sum & 0x0000003c00000000) >> 34);
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if(offset--) {
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buf[i++] = ((sum & 0x0000000300000000) >> 26) | ((sum & 0x0000fc0000000000) >> 42);
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if(offset--) {
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sum -= 0x004e000000000000;
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buf[i] = ((sum & 0x0000030000000000) >> 34) | ((sum & 0x003f000000000000) >> 48);
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}
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}
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}
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}
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}
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}
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return outlen;
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}
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