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New world format, fixes

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MihailRis 2023-11-05 15:32:46 +03:00 • committed by GitHub
parent 0c65b13f4e
commit 0cf8382e95
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21 changed files with 350 additions and 173 deletions
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90
src/files/rle.cpp Normal file
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#include "rle.h"
size_t rle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
ubyte len = src[i++];
ubyte c = src[i++];
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}
}
return offset;
}
size_t rle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
if (srclen == 0) {
return 0;
}
size_t offset = 0;
ubyte counter = 0;
ubyte c = src[0];
for (size_t i = 1; i < srclen; i++) {
ubyte cnext = src[i];
if (cnext != c || counter == 255) {
dst[offset++] = counter;
dst[offset++] = c;
c = cnext;
counter = 0;
}
else {
counter++;
}
}
dst[offset++] = counter;
dst[offset++] = c;
return offset;
}
size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
size_t offset = 0;
for (size_t i = 0; i < srclen;) {
uint len = src[i++];
if (len & 0x80) {
len &= 0x7F;
len |= ((uint)src[i++]) << 7;
}
ubyte c = src[i++];
for (size_t j = 0; j <= len; j++) {
dst[offset++] = c;
}
}
return offset;
}
size_t extrle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
if (srclen == 0) {
return 0;
}
size_t offset = 0;
uint counter = 0;
ubyte c = src[0];
for (size_t i = 1; i < srclen; i++) {
ubyte cnext = src[i];
if (cnext != c || counter == max_sequence) {
if (counter >= 0x80) {
dst[offset++] = 0x80 | (counter & 0x7F);
dst[offset++] = counter >> 7;
}
else {
dst[offset++] = counter;
}
dst[offset++] = c;
c = cnext;
counter = 0;
}
else {
counter++;
}
}
if (counter >= 0x80) {
dst[offset++] = 0x80 | (counter & 0x7F);
dst[offset++] = counter >> 7;
}
else {
dst[offset++] = counter;
}
dst[offset++] = c;
return offset;
}