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[unpaker2] Some RLEW experiments.

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This commit is contained in:
lzwdgc 2023-01-10 14:41:39 +03:00
parent e0343576b7
commit 6b1db00fe6
2 changed files with 15 additions and 25 deletions
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38
src/unpaker2/unpaker2.cpp
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@ -32,8 +32,6 @@
#include <stdint.h>
#include <string>
//#include <archive.h>
#include <lzma.h>
#include <lzo/lzo1x.h>
using namespace std;
@ -108,7 +106,7 @@ void unpack_file(path fn) {
break;
}
case segment::decode_algorithm::lzo: {
size_t outsz = supported_block_size;
size_t outsz;
auto r2 = lzo1x_decompress(s.p, len, pp, &outsz, 0);
if (r2 != LZO_E_OK) {
throw std::runtime_error{"lzo error"};
@ -117,31 +115,22 @@ void unpack_file(path fn) {
break;
}
case segment::decode_algorithm::rlew: {
auto finalLength = len;
//uint16_t flag = 0xfefe;
//uint8_t flag = 0xfe;
auto base = s.p;
uint16_t flag = s;
flag <<= 8;
flag |= 0xfe;
uint32_t outlen = 0;
while (outlen < finalLength) {
if (pp-bbb.data() == 0x1cc38) {
int a = 5;
a++;
}
decltype(flag) w = s;
if (w == flag) {
decltype(flag) w1 = s;
decltype(flag) w2 = s;
while (w1--) {
*(decltype(flag) *)pp = w2;
pp += sizeof(flag);
outlen += sizeof(flag);
while (s.p < base + len) {
uint8_t w = s;
if (w == 0xfe && (*(uint8_t*)s.p) == flag) {
uint8_t w1 = s;
auto cntr = 0x20e;
uint8_t w2 = s;
while (cntr--) {
*(decltype(w2)*)pp = w2;
pp += sizeof(w2);
}
} else {
*(decltype(flag)*)pp = w;
pp += sizeof(flag);
outlen += sizeof(flag);
*(decltype(w)*)pp = w;
pp += sizeof(w);
}
}
break;
@ -151,6 +140,7 @@ void unpack_file(path fn) {
throw std::runtime_error{"compression unsupported: "s + std::to_string(seg.algorithm)};
}
}
exi:
pp = bbb.data();
auto dir = fn += ".dir2";

2
sw.cpp
View file

@ -54,7 +54,7 @@ void build(Solution &s)
auto &unpaker = add_exe_base("unpaker"); // 32-bit only
if (unpaker.getBuildSettings().TargetOS.Arch != ArchType::x86)
unpaker.HeaderOnly = true;
add_exe_with_common("unpaker2") += "org.sw.demo.libarchive.libarchive"_dep;
add_exe_with_common("unpaker2") += "org.sw.demo.oberhumer.lzo.lzo"_dep;
// not so simple targets
auto &script2txt = add_exe_with_common("script2txt");