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[unpaker2] Cleanup.

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This commit is contained in:
lzwdgc 2023-01-10 17:35:10 +03:00
parent 9c92592398
commit ff7af660c7
1 changed files with 1 additions and 60 deletions
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61
src/unpaker2/unpaker2.cpp
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@ -83,38 +83,6 @@ struct stream {
}
};
void decode_rle(const short *input, const int size, short *&output) {
if (size < 2)
return;
// input ptr, also rle_indicator
const auto rle_indicator = input++;
while (1) {
auto c = *input++;
if ((c & 0xFF00) != (*rle_indicator << 8))
*output++ = c;
else {
uint32_t count = (uint8_t)c;
if (count == (*rle_indicator << 8) + 255)
*output++ = c; // insert indicator byte itself
else {
count += 3;
for (int i = 0; i < count / 2; i++) {
*output++ = *input;
*output++ = *input;
}
for (int i = 0; i < ((count / 2) & 1); i++) {
*output++ = *input;
}
}
}
if (input >= rle_indicator + size)
return;
}
}
void unpack_file(path fn) {
primitives::templates2::mmap_file<uint8_t> f{fn};
stream s{f};
@ -143,51 +111,24 @@ void unpack_file(path fn) {
break;
}
case segment::decode_algorithm::rlew: {
/*short *pps = (short*)pp;
decode_rle((short*)s.p, len, pps);
pp = (uint8_t*)pps;
break;*/
auto base = s.p;
uint16_t flag = s;
while (s.p < base + len) {
uint16_t w = s;
if ((w & 0xFF00) == (flag << 8)) {
uint16_t count = (uint8_t)w;
if (count == 0xff) {
if (count == 0xFF) {
uint16_t w2 = s;
*(decltype(w2) *)pp = w2;
pp += sizeof(w2);
continue;
}
if (count == (flag << 8) + 255) {
throw std::runtime_error{"untested branch"};
*(decltype(w) *)pp = w;
pp += sizeof(w);
continue;
}
uint16_t w2 = s;
count += 3;
while (count--) {
*(decltype(w2)*)pp = w2;
pp += sizeof(w2);
}
/*
*
for (int i = 0; i < count / 2; i++) {
*(decltype(w) *)pp = w2;
pp += sizeof(w2);
*(decltype(w) *)pp = w2;
pp += sizeof(w2);
}
for (int i = 0; i < ((count / 2) & 1); i++) {
*(decltype(w) *)pp = w2;
pp += sizeof(w2);
}*/
} else {
*(decltype(w)*)pp = w;
pp += sizeof(w);