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Merge pull request #1424 from DarkLordZach/ips-witch

ips_layer: Add support for IPSwitch executable patches
This commit is contained in:
bunnei 2018-10-08 12:30:33 -04:00 committed by GitHub
commit 6b48ba5271
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 322 additions and 22 deletions

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@ -18,6 +18,25 @@ u8 ToHexNibble(char c1) {
return 0; return 0;
} }
std::vector<u8> HexStringToVector(std::string_view str, bool little_endian) {
std::vector<u8> out(str.size() / 2);
if (little_endian) {
for (std::size_t i = str.size() - 2; i <= str.size(); i -= 2)
out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
} else {
for (std::size_t i = 0; i < str.size(); i += 2)
out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
}
return out;
}
std::string HexVectorToString(const std::vector<u8>& vector, bool upper) {
std::string out;
for (u8 c : vector)
out += fmt::format(upper ? "{:02X}" : "{:02x}", c);
return out;
}
std::array<u8, 16> operator""_array16(const char* str, std::size_t len) { std::array<u8, 16> operator""_array16(const char* str, std::size_t len) {
if (len != 32) { if (len != 32) {
LOG_ERROR(Common, LOG_ERROR(Common,

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@ -7,6 +7,7 @@
#include <array> #include <array>
#include <cstddef> #include <cstddef>
#include <string> #include <string>
#include <vector>
#include <fmt/format.h> #include <fmt/format.h>
#include "common/common_types.h" #include "common/common_types.h"
@ -14,6 +15,8 @@ namespace Common {
u8 ToHexNibble(char c1); u8 ToHexNibble(char c1);
std::vector<u8> HexStringToVector(std::string_view str, bool little_endian);
template <std::size_t Size, bool le = false> template <std::size_t Size, bool le = false>
std::array<u8, Size> HexStringToArray(std::string_view str) { std::array<u8, Size> HexStringToArray(std::string_view str) {
std::array<u8, Size> out{}; std::array<u8, Size> out{};
@ -27,6 +30,8 @@ std::array<u8, Size> HexStringToArray(std::string_view str) {
return out; return out;
} }
std::string HexVectorToString(const std::vector<u8>& vector, bool upper = true);
template <std::size_t Size> template <std::size_t Size>
std::string HexArrayToString(std::array<u8, Size> array, bool upper = true) { std::string HexArrayToString(std::array<u8, Size> array, bool upper = true) {
std::string out; std::string out;

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@ -2,7 +2,9 @@
// Licensed under GPLv2 or any later version // Licensed under GPLv2 or any later version
// Refer to the license.txt file included. // Refer to the license.txt file included.
#include <sstream>
#include "common/assert.h" #include "common/assert.h"
#include "common/hex_util.h"
#include "common/swap.h" #include "common/swap.h"
#include "core/file_sys/ips_layer.h" #include "core/file_sys/ips_layer.h"
#include "core/file_sys/vfs_vector.h" #include "core/file_sys/vfs_vector.h"
@ -15,6 +17,12 @@ enum class IPSFileType {
Error, Error,
}; };
constexpr std::array<std::pair<const char*, const char*>, 11> ESCAPE_CHARACTER_MAP{
std::pair{"\\a", "\a"}, {"\\b", "\b"}, {"\\f", "\f"}, {"\\n", "\n"},
{"\\r", "\r"}, {"\\t", "\t"}, {"\\v", "\v"}, {"\\\\", "\\"},
{"\\\'", "\'"}, {"\\\"", "\""}, {"\\\?", "\?"},
};
static IPSFileType IdentifyMagic(const std::vector<u8>& magic) { static IPSFileType IdentifyMagic(const std::vector<u8>& magic) {
if (magic.size() != 5) if (magic.size() != 5)
return IPSFileType::Error; return IPSFileType::Error;
@ -85,4 +93,205 @@ VirtualFile PatchIPS(const VirtualFile& in, const VirtualFile& ips) {
return std::make_shared<VectorVfsFile>(in_data, in->GetName(), in->GetContainingDirectory()); return std::make_shared<VectorVfsFile>(in_data, in->GetName(), in->GetContainingDirectory());
} }
IPSwitchCompiler::IPSwitchCompiler(VirtualFile patch_text_) : patch_text(std::move(patch_text_)) {
Parse();
}
IPSwitchCompiler::~IPSwitchCompiler() = default;
std::array<u8, 32> IPSwitchCompiler::GetBuildID() const {
return nso_build_id;
}
bool IPSwitchCompiler::IsValid() const {
return valid;
}
static bool StartsWith(std::string_view base, std::string_view check) {
return base.size() >= check.size() && base.substr(0, check.size()) == check;
}
static std::string EscapeStringSequences(std::string in) {
for (const auto& seq : ESCAPE_CHARACTER_MAP) {
for (auto index = in.find(seq.first); index != std::string::npos;
index = in.find(seq.first, index)) {
in.replace(index, std::strlen(seq.first), seq.second);
index += std::strlen(seq.second);
}
}
return in;
}
void IPSwitchCompiler::ParseFlag(const std::string& line) {
if (StartsWith(line, "@flag offset_shift ")) {
// Offset Shift Flag
offset_shift = std::stoll(line.substr(19), nullptr, 0);
} else if (StartsWith(line, "@little-endian")) {
// Set values to read as little endian
is_little_endian = true;
} else if (StartsWith(line, "@big-endian")) {
// Set values to read as big endian
is_little_endian = false;
} else if (StartsWith(line, "@flag print_values")) {
// Force printing of applied values
print_values = true;
}
}
void IPSwitchCompiler::Parse() {
const auto bytes = patch_text->ReadAllBytes();
std::stringstream s;
s.write(reinterpret_cast<const char*>(bytes.data()), bytes.size());
std::vector<std::string> lines;
std::string stream_line;
while (std::getline(s, stream_line)) {
// Remove a trailing \r
if (!stream_line.empty() && stream_line.back() == '\r')
stream_line.pop_back();
lines.push_back(std::move(stream_line));
}
for (std::size_t i = 0; i < lines.size(); ++i) {
auto line = lines[i];
// Remove midline comments
std::size_t comment_index = std::string::npos;
bool within_string = false;
for (std::size_t k = 0; k < line.size(); ++k) {
if (line[k] == '\"' && (k > 0 && line[k - 1] != '\\')) {
within_string = !within_string;
} else if (line[k] == '\\' && (k < line.size() - 1 && line[k + 1] == '\\')) {
comment_index = k;
break;
}
}
if (!StartsWith(line, "//") && comment_index != std::string::npos) {
last_comment = line.substr(comment_index + 2);
line = line.substr(0, comment_index);
}
if (StartsWith(line, "@stop")) {
// Force stop
break;
} else if (StartsWith(line, "@nsobid-")) {
// NSO Build ID Specifier
auto raw_build_id = line.substr(8);
if (raw_build_id.size() != 0x40)
raw_build_id.resize(0x40, '0');
nso_build_id = Common::HexStringToArray<0x20>(raw_build_id);
} else if (StartsWith(line, "#")) {
// Mandatory Comment
LOG_INFO(Loader, "[IPSwitchCompiler ('{}')] Forced output comment: {}",
patch_text->GetName(), line.substr(1));
} else if (StartsWith(line, "//")) {
// Normal Comment
last_comment = line.substr(2);
if (last_comment.find_first_not_of(' ') == std::string::npos)
continue;
if (last_comment.find_first_not_of(' ') != 0)
last_comment = last_comment.substr(last_comment.find_first_not_of(' '));
} else if (StartsWith(line, "@enabled") || StartsWith(line, "@disabled")) {
// Start of patch
const auto enabled = StartsWith(line, "@enabled");
if (i == 0)
return;
LOG_INFO(Loader, "[IPSwitchCompiler ('{}')] Parsing patch '{}' ({})",
patch_text->GetName(), last_comment, line.substr(1));
IPSwitchPatch patch{last_comment, enabled, {}};
// Read rest of patch
while (true) {
if (i + 1 >= lines.size())
break;
const auto patch_line = lines[++i];
// Start of new patch
if (StartsWith(patch_line, "@enabled") || StartsWith(patch_line, "@disabled")) {
--i;
break;
}
// Check for a flag
if (StartsWith(patch_line, "@")) {
ParseFlag(patch_line);
continue;
}
// 11 - 8 hex digit offset + space + minimum two digit overwrite val
if (patch_line.length() < 11)
break;
auto offset = std::stoul(patch_line.substr(0, 8), nullptr, 16);
offset += offset_shift;
std::vector<u8> replace;
// 9 - first char of replacement val
if (patch_line[9] == '\"') {
// string replacement
auto end_index = patch_line.find('\"', 10);
if (end_index == std::string::npos || end_index < 10)
return;
while (patch_line[end_index - 1] == '\\') {
end_index = patch_line.find('\"', end_index + 1);
if (end_index == std::string::npos || end_index < 10)
return;
}
auto value = patch_line.substr(10, end_index - 10);
value = EscapeStringSequences(value);
replace.reserve(value.size());
std::copy(value.begin(), value.end(), std::back_inserter(replace));
} else {
// hex replacement
const auto value = patch_line.substr(9);
replace.reserve(value.size() / 2);
replace = Common::HexStringToVector(value, is_little_endian);
}
if (print_values) {
LOG_INFO(Loader,
"[IPSwitchCompiler ('{}')] - Patching value at offset 0x{:08X} "
"with byte string '{}'",
patch_text->GetName(), offset, Common::HexVectorToString(replace));
}
patch.records.insert_or_assign(offset, std::move(replace));
}
patches.push_back(std::move(patch));
} else if (StartsWith(line, "@")) {
ParseFlag(line);
}
}
valid = true;
}
VirtualFile IPSwitchCompiler::Apply(const VirtualFile& in) const {
if (in == nullptr || !valid)
return nullptr;
auto in_data = in->ReadAllBytes();
for (const auto& patch : patches) {
if (!patch.enabled)
continue;
for (const auto& record : patch.records) {
if (record.first >= in_data.size())
continue;
auto replace_size = record.second.size();
if (record.first + replace_size > in_data.size())
replace_size = in_data.size() - record.first;
for (std::size_t i = 0; i < replace_size; ++i)
in_data[i + record.first] = record.second[i];
}
}
return std::make_shared<VectorVfsFile>(in_data, in->GetName(), in->GetContainingDirectory());
}
} // namespace FileSys } // namespace FileSys

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@ -12,4 +12,34 @@ namespace FileSys {
VirtualFile PatchIPS(const VirtualFile& in, const VirtualFile& ips); VirtualFile PatchIPS(const VirtualFile& in, const VirtualFile& ips);
class IPSwitchCompiler {
public:
explicit IPSwitchCompiler(VirtualFile patch_text);
~IPSwitchCompiler();
std::array<u8, 0x20> GetBuildID() const;
bool IsValid() const;
VirtualFile Apply(const VirtualFile& in) const;
private:
void ParseFlag(const std::string& flag);
void Parse();
bool valid = false;
struct IPSwitchPatch {
std::string name;
bool enabled;
std::map<u32, std::vector<u8>> records;
};
VirtualFile patch_text;
std::vector<IPSwitchPatch> patches;
std::array<u8, 0x20> nso_build_id{};
bool is_little_endian = false;
s64 offset_shift = 0;
bool print_values = false;
std::string last_comment = "";
};
} // namespace FileSys } // namespace FileSys

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@ -73,27 +73,38 @@ VirtualDir PatchManager::PatchExeFS(VirtualDir exefs) const {
return exefs; return exefs;
} }
static std::vector<VirtualFile> CollectIPSPatches(const std::vector<VirtualDir>& patch_dirs, static std::vector<VirtualFile> CollectPatches(const std::vector<VirtualDir>& patch_dirs,
const std::string& build_id) { const std::string& build_id) {
std::vector<VirtualFile> ips; std::vector<VirtualFile> out;
ips.reserve(patch_dirs.size()); out.reserve(patch_dirs.size());
for (const auto& subdir : patch_dirs) { for (const auto& subdir : patch_dirs) {
auto exefs_dir = subdir->GetSubdirectory("exefs"); auto exefs_dir = subdir->GetSubdirectory("exefs");
if (exefs_dir != nullptr) { if (exefs_dir != nullptr) {
for (const auto& file : exefs_dir->GetFiles()) { for (const auto& file : exefs_dir->GetFiles()) {
if (file->GetExtension() != "ips") if (file->GetExtension() == "ips") {
continue;
auto name = file->GetName(); auto name = file->GetName();
const auto p1 = name.substr(0, name.find('.')); const auto p1 = name.substr(0, name.find('.'));
const auto this_build_id = p1.substr(0, p1.find_last_not_of('0') + 1); const auto this_build_id = p1.substr(0, p1.find_last_not_of('0') + 1);
if (build_id == this_build_id) if (build_id == this_build_id)
ips.push_back(file); out.push_back(file);
} else if (file->GetExtension() == "pchtxt") {
IPSwitchCompiler compiler{file};
if (!compiler.IsValid())
continue;
auto this_build_id = Common::HexArrayToString(compiler.GetBuildID());
this_build_id =
this_build_id.substr(0, this_build_id.find_last_not_of('0') + 1);
if (build_id == this_build_id)
out.push_back(file);
}
} }
} }
} }
return ips; return out;
} }
std::vector<u8> PatchManager::PatchNSO(const std::vector<u8>& nso) const { std::vector<u8> PatchManager::PatchNSO(const std::vector<u8>& nso) const {
@ -115,15 +126,24 @@ std::vector<u8> PatchManager::PatchNSO(const std::vector<u8>& nso) const {
auto patch_dirs = load_dir->GetSubdirectories(); auto patch_dirs = load_dir->GetSubdirectories();
std::sort(patch_dirs.begin(), patch_dirs.end(), std::sort(patch_dirs.begin(), patch_dirs.end(),
[](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); }); [](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); });
const auto ips = CollectIPSPatches(patch_dirs, build_id); const auto patches = CollectPatches(patch_dirs, build_id);
auto out = nso; auto out = nso;
for (const auto& ips_file : ips) { for (const auto& patch_file : patches) {
LOG_INFO(Loader, " - Appling IPS patch from mod \"{}\"", if (patch_file->GetExtension() == "ips") {
ips_file->GetContainingDirectory()->GetParentDirectory()->GetName()); LOG_INFO(Loader, " - Applying IPS patch from mod \"{}\"",
const auto patched = PatchIPS(std::make_shared<VectorVfsFile>(out), ips_file); patch_file->GetContainingDirectory()->GetParentDirectory()->GetName());
const auto patched = PatchIPS(std::make_shared<VectorVfsFile>(out), patch_file);
if (patched != nullptr) if (patched != nullptr)
out = patched->ReadAllBytes(); out = patched->ReadAllBytes();
} else if (patch_file->GetExtension() == "pchtxt") {
LOG_INFO(Loader, " - Applying IPSwitch patch from mod \"{}\"",
patch_file->GetContainingDirectory()->GetParentDirectory()->GetName());
const IPSwitchCompiler compiler{patch_file};
const auto patched = compiler.Apply(std::make_shared<VectorVfsFile>(out));
if (patched != nullptr)
out = patched->ReadAllBytes();
}
} }
if (out.size() < 0x100) if (out.size() < 0x100)
@ -143,7 +163,7 @@ bool PatchManager::HasNSOPatch(const std::array<u8, 32>& build_id_) const {
std::sort(patch_dirs.begin(), patch_dirs.end(), std::sort(patch_dirs.begin(), patch_dirs.end(),
[](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); }); [](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); });
return !CollectIPSPatches(patch_dirs, build_id).empty(); return !CollectPatches(patch_dirs, build_id).empty();
} }
static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType type) { static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType type) {
@ -263,8 +283,24 @@ std::map<std::string, std::string, std::less<>> PatchManager::GetPatchVersionNam
if (mod_dir != nullptr && mod_dir->GetSize() > 0) { if (mod_dir != nullptr && mod_dir->GetSize() > 0) {
for (const auto& mod : mod_dir->GetSubdirectories()) { for (const auto& mod : mod_dir->GetSubdirectories()) {
std::string types; std::string types;
if (IsDirValidAndNonEmpty(mod->GetSubdirectory("exefs")))
const auto exefs_dir = mod->GetSubdirectory("exefs");
if (IsDirValidAndNonEmpty(exefs_dir)) {
bool ips = false;
bool ipswitch = false;
for (const auto& file : exefs_dir->GetFiles()) {
if (file->GetExtension() == "ips")
ips = true;
else if (file->GetExtension() == "pchtxt")
ipswitch = true;
}
if (ips)
AppendCommaIfNotEmpty(types, "IPS"); AppendCommaIfNotEmpty(types, "IPS");
if (ipswitch)
AppendCommaIfNotEmpty(types, "IPSwitch");
}
if (IsDirValidAndNonEmpty(mod->GetSubdirectory("romfs"))) if (IsDirValidAndNonEmpty(mod->GetSubdirectory("romfs")))
AppendCommaIfNotEmpty(types, "LayeredFS"); AppendCommaIfNotEmpty(types, "LayeredFS");

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@ -36,6 +36,7 @@ public:
// Currently tracked NSO patches: // Currently tracked NSO patches:
// - IPS // - IPS
// - IPSwitch
std::vector<u8> PatchNSO(const std::vector<u8>& nso) const; std::vector<u8> PatchNSO(const std::vector<u8>& nso) const;
// Checks to see if PatchNSO() will have any effect given the NSO's build ID. // Checks to see if PatchNSO() will have any effect given the NSO's build ID.