fumiama/base16384
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优化性能，修复32位编码错误，增加大端支持

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fumiama
2021-10-29 21:47:46 +08:00
parent 0f5fcfdba9
commit 549d56c996
2 changed files with 90 additions and 60 deletions
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64
64/base14.c
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@@ -1,5 +1,5 @@
//base1464le.c
//fumiama 20210407
//base14.c
//fumiama 20211029
#include <stdio.h>
#include <stdlib.h>
#include "base14.h"
@@ -29,16 +29,17 @@ LENDAT* encode(const uint8_t* data, const int64_t len) {
uint64_t n = 0;
int64_t i = 0;
for(; i <= len - 7; i += 7) {
register uint64_t sum = 0x000000000000003f & ((uint64_t)data[i] >> 2);
sum |= (((uint64_t)data[i + 1] << 6) | (data[i] << 14)) & 0x000000000000ff00;
sum |= (((uint64_t)data[i + 1] << 20) | ((uint64_t)data[i + 2] << 12)) & 0x00000000003f0000;
sum |= (((uint64_t)data[i + 2] << 28) | ((uint64_t)data[i + 3] << 20)) & 0x00000000ff000000;
sum |= (((uint64_t)data[i + 3] << 34) | ((uint64_t)data[i + 4] << 26)) & 0x0000003f00000000;
sum |= (((uint64_t)data[i + 4] << 42) | ((uint64_t)data[i + 5] << 34)) & 0x0000ff0000000000;
sum |= ((uint64_t)data[i + 5] << 48) & 0x003f000000000000;
sum |= ((uint64_t)data[i + 6] << 56) & 0xff00000000000000;
sum += 0x004e004e004e004e;
vals[n++] = sum;
register uint64_t sum = 0;
register uint64_t shift = htonll(*(uint64_t*)(data+i))>>2; //这里有读取越界
sum |= shift & 0x3fff000000000000;
shift >>= 2;
sum |= shift & 0x00003fff00000000;
shift >>= 2;
sum |= shift & 0x000000003fff0000;
shift >>= 2;
sum |= shift & 0x0000000000003fff;
sum += 0x4e004e004e004e00;
vals[n++] = ntohll(sum);
#ifdef DEBUG
printf("i: %llu, add sum: %016llx\n", i, sum);
#endif
@@ -68,7 +69,11 @@ LENDAT* encode(const uint8_t* data, const int64_t len) {
}
}
sum += 0x004e004e004e004e;
vals[n] = sum;
#if BYTE_ORDER == BIG_ENDIAN
vals[n] = __builtin_bswap64(sum);
#else
vals[n] = sum;
#endif
#ifdef DEBUG
printf("i: %llu, add sum: %016llx\n", i, sum);
#endif
@@ -96,23 +101,34 @@ LENDAT* decode(const uint8_t* data, const int64_t len) {
}
}
outlen = outlen / 8 * 7 + offset;
decd->data = (uint8_t*)malloc(outlen);
decd->data = (uint8_t*)malloc(outlen+1); //多出1字节用于循环覆盖
decd->len = outlen;
uint64_t* vals = (uint64_t*)data;
uint64_t n = 0;
int64_t i = 0;
for(; i <= outlen - 7; n++) {
register uint64_t sum = vals[n] - 0x004e004e004e004e;
decd->data[i++] = ((sum & 0x000000000000003f) << 2) | ((sum & 0x000000000000c000) >> 14);
decd->data[i++] = ((sum & 0x0000000000003f00) >> 6) | ((sum & 0x0000000000300000) >> 20);
decd->data[i++] = ((sum & 0x00000000000f0000) >> 12) | ((sum & 0x00000000f0000000) >> 28);
decd->data[i++] = ((sum & 0x000000000f000000) >> 20) | ((sum & 0x0000003c00000000) >> 34);
decd->data[i++] = ((sum & 0x0000000300000000) >> 26) | ((sum & 0x0000fc0000000000) >> 42);
decd->data[i++] = ((sum & 0x0000030000000000) >> 34) | ((sum & 0x003f000000000000) >> 48);
decd->data[i++] = ((sum & 0xff00000000000000) >> 56);
for(; i <= outlen - 7; n++, i+=7) {
register uint64_t sum = 0;
register uint64_t shift = htonll(vals[n]) - 0x4e004e004e004e00;
shift <<= 2;
sum |= shift & 0xfffc000000000000;
shift <<= 2;
sum |= shift & 0x0003fff000000000;
shift <<= 2;
sum |= shift & 0x0000000fffc00000;
shift <<= 2;
sum |= shift & 0x00000000003fff00;
*(uint64_t*)(decd->data+i) = ntohll(sum);
#ifdef DEBUG
printf("i: %llu, add sum: %016llx\n", i, sum);
#endif
}
if(offset--) {
register uint64_t sum = vals[n] - 0x000000000000004e;
//这里有读取越界
#if BYTE_ORDER == BIG_ENDIAN
register uint64_t sum = __builtin_bswap64(vals[n]) - 0x000000000000004e;
#else
register uint64_t sum = vals[n] - 0x000000000000004e;
#endif
decd->data[i++] = ((sum & 0x000000000000003f) << 2) | ((sum & 0x000000000000c000) >> 14);
if(offset--) {
sum -= 0x00000000004e0000;