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add extRLE16 encoder/decoder

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This commit is contained in:
MihailRis 2024-09-04 23:27:52 +03:00
parent 0b3bb36188
commit 73a8343f61
4 changed files with 85 additions and 8 deletions
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83
src/coders/rle.cpp
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@ -1,5 +1,7 @@
#include "rle.hpp"
#include "util/data_io.hpp"
size_t rle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
@ -40,8 +42,8 @@ size_t rle::decode16(const ubyte* src, size_t srclen, ubyte* dst) {
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++];
uint16_t len = dataio::le2h(src16[i++]);
uint16_t c = dataio::le2h(src16[i++]);
for (size_t j = 0; j <= len; j++) {
dst16[offset++] = c;
}
@ -61,16 +63,16 @@ size_t rle::encode16(const ubyte* src, size_t srclen, ubyte* dst) {
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;
dst16[offset++] = dataio::h2le(counter);
dst16[offset++] = dataio::h2le(c);
c = cnext;
counter = 0;
} else {
counter++;
}
}
dst16[offset++] = counter;
dst16[offset++] = c;
dst16[offset++] = dataio::h2le(counter);
dst16[offset++] = dataio::h2le(c);
return offset * 2;
}
@ -80,7 +82,7 @@ size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
uint len = src[i++];
if (len & 0x80) {
len &= 0x7F;
len |= ((uint)src[i++]) << 7;
len |= (static_cast<uint>(src[i++])) << 7;
}
ubyte c = src[i++];
for (size_t j = 0; j <= len; j++) {
@ -122,3 +124,70 @@ size_t extrle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
dst[offset++] = c;
return offset;
}
size_t extrle::decode16(const ubyte* src, size_t srclen, ubyte* dst8) {
auto dst = reinterpret_cast<uint16_t*>(dst8);
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
uint len = src[i++];
bool widechar = len & 0x40;
if (len & 0x80) {
len &= 0x3F;
len |= (static_cast<uint>(src[i++])) << 6;
} else {
len &= 0x3F;
}
uint16_t c = src[i++];
if (widechar) {
c |= ((static_cast<uint>(src[i++])) << 8);
}
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}
}
return offset * 2;
}
size_t extrle::encode16(const ubyte* src8, size_t srclen, ubyte* dst) {
if (srclen == 0) {
return 0;
}
auto src = reinterpret_cast<const uint16_t*>(src8);
size_t offset = 0;
uint counter = 0;
uint16_t c = src[0];
for (size_t i = 1; i < srclen/2; i++) {
uint16_t cnext = src[i];
if (cnext != c || counter == max_sequence) {
if (counter >= 0x40) {
dst[offset++] = 0x80 | ((c > 255) << 6) | (counter & 0x3F);
dst[offset++] = counter >> 6;
} else {
dst[offset++] = counter | ((c > 255) << 6);
}
if (c > 255) {
dst[offset++] = c & 0xFF;
dst[offset++] = c >> 8;
} else {
dst[offset++] = c;
}
c = cnext;
counter = 0;
} else {
counter++;
}
}
if (counter >= 0x40) {
dst[offset++] = 0x80 | ((c > 255) << 6) | (counter & 0x3F);
dst[offset++] = counter >> 6;
} else {
dst[offset++] = counter | ((c > 255) << 6);
}
if (c > 255) {
dst[offset++] = c & 0xFF;
dst[offset++] = c >> 8;
} else {
dst[offset++] = c;
}
return offset;
}