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Added IPS patching

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This commit is contained in:
Zak Kurka 2018-10-20 13:09:05 -05:00
parent eadd8b91b2
commit 2496ecbaf6
2 changed files with 46 additions and 0 deletions
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38
src/core/file_sys/ncch_container.cpp
View file

@ -481,6 +481,21 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
dec.ProcessData(&buffer[0], &buffer[0], section.size);
}
}
std::string override_ips = filepath + ".exefsdir/code.ips";
if (FileUtil::Exists(override_ips) && strcmp(name, ".code") == 0) {
FileUtil::IOFile ips_file(override_ips, "rb");
size_t ips_file_size = ips_file.GetSize();
std::vector<u8> ips(ips_file_size);
if (ips_file.IsOpen() &&
ips_file.ReadBytes(&ips[0], ips_file_size) == ips_file_size) {
LOG_WARNING(Service_FS, "File {} patching code.bin", override_ips);
ApplyIPS(ips, buffer);
}
}
return Loader::ResultStatus::Success;
}
}
@ -519,6 +534,29 @@ Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
return Loader::ResultStatus::ErrorNotUsed;
}
Loader::ResultStatus NCCHContainer::ApplyIPS(std::vector<u8>& ips, std::vector<u8>& buffer) {
u32 cursor = 5;
u32 patch_length = ips.size() - 3;
std::string ips_header(ips.begin(), ips.begin() + 5);
if (strcmp(ips_header.c_str(), "PATCH"))
return Loader::ResultStatus::Error;
while (cursor < patch_length) {
u32 offset = (ips[cursor]) << 16 | (ips[cursor + 1]) << 8 | (ips[cursor + 2]);
u32 length = (ips[cursor + 3]) << 8 | (ips[cursor + 4]);
cursor += 5;
for (int i = 0; i < length; i++) {
buffer[offset + i] = ips[cursor + i];
}
cursor += length;
}
return Loader::ResultStatus::Success;
}
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
Loader::ResultStatus result = Load();
if (result != Loader::ResultStatus::Success)

8
src/core/file_sys/ncch_container.h
View file

@ -249,6 +249,14 @@ public:
*/
Loader::ResultStatus ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file);
/**
* Attempts to patch a buffer using an IPS
* @param ips Vector of the patches to apply
* @param buffer Vector to patch data into
* @return ResultStatus result of function
*/
Loader::ResultStatus ApplyIPS(std::vector<u8>& ips, std::vector<u8>& buffer);
/**
* Get the override RomFS of the NCCH container
* Since the RomFS can be huge, we return a file reference instead of copying to a buffer