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add util::Buffer, rle::encode16, rle::decode16

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MihailRis 2024-09-03 23:33:29 +03:00
parent 728795f0f3
commit c15abfa715
7 changed files with 144 additions and 31 deletions
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39
src/coders/rle.cpp
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@ -35,6 +35,45 @@ 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) {
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 = src16[i++];
uint16_t c = src16[i++];
for (size_t j = 0; j <= len; j++) {
dst16[offset++] = c;
}
}
return offset * 2;
}
size_t rle::encode16(const ubyte* src, size_t srclen, ubyte* dst) {
if (srclen == 0) {
return 0;
}
auto src16 = reinterpret_cast<const uint16_t*>(src);
auto dst16 = reinterpret_cast<uint16_t*>(dst);
size_t offset = 0;
uint16_t counter = 0;
uint16_t c = src16[0];
for (size_t i = 1; i < srclen / 2; i++) {
uint16_t cnext = src16[i];
if (cnext != c || counter == 0xFFFF) {
dst16[offset++] = counter;
dst16[offset++] = c;
c = cnext;
counter = 0;
} else {
counter++;
}
}
dst16[offset++] = counter;
dst16[offset++] = c;
return offset * 2;
}
size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {