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[ExeFS] LZ77 decompression for .code file

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wheremyfoodat 2022-10-03 00:22:41 +03:00
parent cd1037857a
commit 36b0117ebc
3 changed files with 110 additions and 5 deletions
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26
src/core/loader/ncch.cpp
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@ -1,4 +1,5 @@
#include <vector>
#include "loader/lz77.hpp"
#include "loader/ncch.hpp"
#include "memory.hpp"
@ -68,8 +69,8 @@ bool NCCH::loadFromHeader(u8* header, IOFile& file) {
}
// ExeFS format allows up to 10 files
for (int file = 0; file < 10; file++) {
u8* fileInfo = &exeFSHeader[file * 16];
for (int i = 0; i < 10; i++) {
u8* fileInfo = &exeFSHeader[i * 16];
char name[9];
std::memcpy(name, fileInfo, 8); // Get file name as a string
@ -79,15 +80,30 @@ bool NCCH::loadFromHeader(u8* header, IOFile& file) {
u32 fileSize = *(u32*)&fileInfo[0xC];
if (fileSize != 0) {
printf("File %d. Name: %s, Size: %08X, Offset: %08X\n", file, name, fileSize, fileOffset);
printf("File %d. Name: %s, Size: %08X, Offset: %08X\n", i, name, fileSize, fileOffset);
}
if (std::strcmp(name, ".code") == 0) {
std::vector<u8> buff;
std::vector<u8> code;
if (compressCode) {
//Helpers::panic("Compressed .code file!");
std::vector<u8> tmp;
tmp.resize(fileSize);
// A file offset of 0 means our file is located right after the ExeFS header
// So in the ROM, files are located at (file offset + exeFS offset + exeFS header size)
file.seek(exeFSOffset + exeFSHeaderSize + fileOffset);
file.readBytes(tmp.data(), fileSize);
// Decompress .code file from the tmp vector to the "code" vector
if (!CartLZ77::decompress(code, tmp)) {
printf("Failed to decompress .code file\n");
return false;
}
} else {
code.resize(fileSize);
file.seek(exeFSOffset + exeFSHeaderSize + fileOffset);
file.readBytes(code.data(), fileSize);
Helpers::panic("Uncompressed .code file!");
}
}