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file_sys: Add support for BPS patches

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The BPS format allows distributing patches that are smaller and that do
not contain copyrighted content if data is relocated
(unlike non-trivial IPS patches).

This is essential for games such as MM3D that have three barely
different code revisions. Supporting all three versions would
demand an unreasonable amount of work; with BPS patches only one
version has to be supported.
This commit is contained in:
Léo Lam
2019-11-25 20:49:48 +01:00
parent 3140086c60
commit 756d231ff9
3 changed files with 236 additions and 11 deletions
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32
src/core/file_sys/ncch_container.cpp
View File

@ -508,21 +508,31 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
}
Loader::ResultStatus NCCHContainer::ApplyCodePatch(std::vector<u8>& code) const {
const std::string override_ips = filepath + ".exefsdir/code.ips";
struct PatchLocation {
std::string path;
bool (*patch_fn)(const std::vector<u8>& patch, std::vector<u8>& code);
};
const std::array<PatchLocation, 2> patch_paths{{
{filepath + ".exefsdir/code.ips", Patch::ApplyIpsPatch},
{filepath + ".exefsdir/code.bps", Patch::ApplyBpsPatch},
}};
FileUtil::IOFile ips_file{override_ips, "rb"};
if (!ips_file)
return Loader::ResultStatus::ErrorNotUsed;
for (const PatchLocation& info : patch_paths) {
FileUtil::IOFile file{info.path, "rb"};
if (!file)
continue;
std::vector<u8> ips(ips_file.GetSize());
if (ips_file.ReadBytes(ips.data(), ips.size()) != ips.size())
return Loader::ResultStatus::Error;
std::vector<u8> patch(file.GetSize());
if (file.ReadBytes(patch.data(), patch.size()) != patch.size())
return Loader::ResultStatus::Error;
LOG_INFO(Service_FS, "File {} patching code.bin", override_ips);
if (!Patch::ApplyIpsPatch(ips, code))
return Loader::ResultStatus::Error;
LOG_INFO(Service_FS, "File {} patching code.bin", info.path);
if (!info.patch_fn(patch, code))
return Loader::ResultStatus::Error;
return Loader::ResultStatus::Success;
return Loader::ResultStatus::Success;
}
return Loader::ResultStatus::ErrorNotUsed;
}
Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,