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reduce allocations while reading chunks data

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MihailRis 2025-12-06 00:58:13 +03:00
parent 21f7390265
commit 9dc9441902
12 changed files with 93 additions and 43 deletions
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22
src/coders/rle.cpp
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@ -1,12 +1,17 @@
#include "rle.hpp"
#include <stdexcept>
#include "util/data_io.hpp"
size_t rle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t rle::decode(const ubyte* src, size_t srclen, ubyte* dst, size_t dstLength) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
ubyte len = src[i++];
ubyte c = src[i++];
if (offset + len >= dstLength) {
throw std::runtime_error("buffer overflow");
}
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}
@ -37,13 +42,16 @@ size_t rle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
return offset;
}
size_t rle::decode16(const ubyte* src, size_t srclen, ubyte* dst) {
size_t rle::decode16(const ubyte* src, size_t srclen, ubyte* dst, size_t dstLength) {
auto src16 = reinterpret_cast<const uint16_t*>(src);
auto dst16 = reinterpret_cast<uint16_t*>(dst);
size_t offset = 0;
for (size_t i = 0; i < srclen / 2;) {
uint16_t len = dataio::le2h(src16[i++]);
uint16_t c = dataio::le2h(src16[i++]);
if (offset + len >= dstLength) {
throw std::runtime_error("buffer overflow");
}
for (size_t j = 0; j <= len; j++) {
dst16[offset++] = c;
}
@ -76,7 +84,7 @@ size_t rle::encode16(const ubyte* src, size_t srclen, ubyte* dst) {
return offset * 2;
}
size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst, size_t dstLength) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
uint len = src[i++];
@ -85,6 +93,9 @@ size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
len |= (static_cast<uint>(src[i++])) << 7;
}
ubyte c = src[i++];
if (offset + len >= dstLength) {
throw std::runtime_error("buffer overflow");
}
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}
@ -125,7 +136,7 @@ size_t extrle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
return offset;
}
size_t extrle::decode16(const ubyte* src, size_t srclen, ubyte* dst8) {
size_t extrle::decode16(const ubyte* src, size_t srclen, ubyte* dst8, size_t dstLength) {
auto dst = reinterpret_cast<uint16_t*>(dst8);
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
@ -141,6 +152,9 @@ size_t extrle::decode16(const ubyte* src, size_t srclen, ubyte* dst8) {
if (widechar) {
c |= ((static_cast<uint>(src[i++])) << 8);
}
if (offset + len >= dstLength) {
throw std::runtime_error("buffer overflow");
}
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}