fumiama/android-base16384
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v3.0.1

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1. 进一步优化编码性能
This commit is contained in:
fumiama
2021-04-09 18:40:45 +08:00
parent b116406542
commit 169b6f01a5
6 changed files with 31 additions and 31 deletions
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24
app/src/main/cpp/base14/32/base1432le.c
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@@ -30,16 +30,16 @@ LENDAT* encode(const uint8_t* data, const u_int32_t len) {
uint32_t i = 0;
for(; i < len; i += 7) {
register uint32_t sum = 0x0000003f & ((uint32_t)data[i] >> 2);
sum |= ((((uint32_t)data[i + 1] >> 2) | (data[i] << 6)) << 8) & 0x0000ff00;
sum |= ((((uint32_t)data[i + 1] << 4) | ((uint32_t)data[i + 2] >> 4)) << 16) & 0x003f0000;
sum |= ((((uint32_t)data[i + 2] << 4) | ((uint32_t)data[i + 3] >> 4)) << 24) & 0xff000000;
sum |= (((uint32_t)data[i + 1] << 6) | (data[i] << 14)) & 0x0000ff00;
sum |= (((uint32_t)data[i + 1] << 20) | ((uint32_t)data[i + 2] << 12)) & 0x003f0000;
sum |= (((uint32_t)data[i + 2] << 28) | ((uint32_t)data[i + 3] << 20)) & 0xff000000;
sum += 0x004e004e;
vals[n++] = sum;
#ifdef DEBUG
printf("n: %u, add sum: %08x\n", n, sum);
#endif
sum = ((((uint32_t)data[i + 3] << 2) | ((uint32_t)data[i + 4] >> 6))) & 0x0000003f;
sum |= ((((uint32_t)data[i + 4] << 2) | ((uint32_t)data[i + 5] >> 6)) << 8) & 0x0000ff00;
sum |= (((uint32_t)data[i + 4] << 10) | ((uint32_t)data[i + 5] << 2)) & 0x0000ff00;
sum |= ((uint32_t)data[i + 5] << 16) & 0x003f0000;
sum |= ((uint32_t)data[i + 6] << 24) & 0xff000000;
sum += 0x004e004e;
@@ -50,27 +50,27 @@ LENDAT* encode(const uint8_t* data, const u_int32_t len) {
}
if(offset > 0) {
register uint32_t sum = 0x0000003f & (data[i] >> 2);
sum |= (((uint32_t)data[i] << 6) << 8) & 0x0000c000;
sum |= ((uint32_t)data[i] << 14) & 0x0000c000;
if(offset > 1) {
sum |= (((uint32_t)data[i + 1] >> 2) << 8) & 0x00003f00;
sum |= (((uint32_t)data[i + 1] << 4) << 16) & 0x00300000;
sum |= ((uint32_t)data[i + 1] << 6) & 0x00003f00;
sum |= ((uint32_t)data[i + 1] << 20) & 0x00300000;
if(offset > 2) {
sum |= (((uint32_t)data[i + 2] >> 4) << 16) & 0x000f0000;
sum |= (((uint32_t)data[i + 2] << 4) << 24) & 0xf0000000;
sum |= ((uint32_t)data[i + 2] << 12) & 0x000f0000;
sum |= ((uint32_t)data[i + 2] << 28) & 0xf0000000;
if(offset == 2) {
sum += 0x004e004e;
vals[n++] = sum;
}
if(offset > 3) {
sum |= (((uint32_t)data[i + 3] >> 4) << 24) & 0x0f000000;
sum |= ((uint32_t)data[i + 3] << 20) & 0x0f000000;
sum += 0x004e004e;
vals[n++] = sum;
sum = (((uint32_t)data[i + 3] << 2)) & 0x0000003c;
if(offset > 4) {
sum |= (((uint32_t)data[i + 4] >> 6)) & 0x00000003;
sum |= (((uint32_t)data[i + 4] << 2) << 8) & 0x0000fc00;
sum |= ((uint32_t)data[i + 4] << 10) & 0x0000fc00;
if(offset > 5) {
sum |= (((uint32_t)data[i + 5] >> 6) << 8) & 0x00000300;
sum |= ((uint32_t)data[i + 5] << 2) & 0x00000300;
sum |= ((uint32_t)data[i + 5] << 16) & 0x003f0000;
}
}