ncch_container: Add support for exheader replacement
This adds support for custom exheaders, which brings feature parity with Luma3DS's code patching functionality and allows for injecting new game code.
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@ -320,9 +320,17 @@ Loader::ResultStatus NCCHContainer::Load() {
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// System archives and DLC don't have an extended header but have RomFS
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if (ncch_header.extended_header_size) {
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if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) !=
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sizeof(ExHeader_Header))
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auto read_exheader = [this](FileUtil::IOFile& file) {
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const std::size_t size = sizeof(exheader_header);
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return file && file.ReadBytes(&exheader_header, size) == size;
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};
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FileUtil::IOFile exheader_override_file{filepath + ".exheader", "rb"};
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if (read_exheader(exheader_override_file)) {
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is_tainted = true;
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} else if (!read_exheader(file)) {
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return Loader::ResultStatus::Error;
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}
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if (is_encrypted) {
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// This ID check is masked to low 32-bit as a toleration to ill-formed ROM created
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