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1bc253f1be
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@ -24,6 +24,53 @@ namespace FileSys {
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static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
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static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
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/**
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* Attempts to patch a buffer using an IPS
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* @param ips Vector of the patches to apply
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* @param buffer Vector to patch data into
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*/
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static void ApplyIPS(std::vector<u8>& ips, std::vector<u8>& buffer) {
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u32 cursor = 5;
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u32 patch_length = ips.size() - 3;
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std::string ips_header(ips.begin(), ips.begin() + 5);
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if (ips_header != "PATCH") {
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LOG_INFO(Service_FS, "Attempted to load invalid IPS");
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return;
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}
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while (cursor < patch_length) {
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std::string eof_check(ips.begin() + cursor, ips.begin() + cursor + 3);
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if (eof_check == "EOF")
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return;
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u32 offset = ips[cursor] << 16 | ips[cursor + 1] << 8 | ips[cursor + 2];
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std::size_t length = ips[cursor + 3] << 8 | ips[cursor + 4];
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// check for an rle record
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if (length == 0) {
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length = ips[cursor + 5] << 8 | ips[cursor + 6];
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if (buffer.size() < offset + length)
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return;
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for (u32 i = 0; i < length; ++i)
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buffer[offset + i] = ips[cursor + 7];
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cursor += 8;
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continue;
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}
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if (buffer.size() < offset + length)
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return;
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std::memcpy(&buffer[offset], &ips[cursor + 5], length);
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cursor += length + 5;
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}
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}
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/**
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* Get the decompressed size of an LZSS compressed ExeFS file
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* @param buffer Buffer of compressed file
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@ -483,6 +530,21 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
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dec.ProcessData(&buffer[0], &buffer[0], section.size);
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}
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}
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std::string override_ips = filepath + ".exefsdir/code.ips";
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if (FileUtil::Exists(override_ips) && strcmp(name, ".code") == 0) {
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FileUtil::IOFile ips_file(override_ips, "rb");
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std::size_t ips_file_size = ips_file.GetSize();
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std::vector<u8> ips(ips_file_size);
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if (ips_file.IsOpen() &&
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ips_file.ReadBytes(&ips[0], ips_file_size) == ips_file_size) {
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LOG_INFO(Service_FS, "File {} patching code.bin", override_ips);
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ApplyIPS(ips, buffer);
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}
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}
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return Loader::ResultStatus::Success;
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}
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}
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