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Move FilePatch Functality to a volume wrapper
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // Copyright 2016 Dolphin Emulator Project | ||
| // Licensed under GPLv2+ | ||
| // Refer to the license.txt file included. | ||
|
|
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| #include <algorithm> | ||
| #include <inttypes.h> | ||
|
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| #include "Core/PatchEngine.h" | ||
| #include "DiscIO/Filesystem.h" | ||
| #include "DiscIO/OverlayVolume.h" | ||
|
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| namespace DiscIO | ||
| { | ||
| std::map<u64, std::vector<u8>> | ||
| OverlayVolume::CalculateDiscOffsets(Volume& disc, std::vector<PatchEngine::Patch>& patches) | ||
| { | ||
| auto partition = disc.GetGamePartition(); | ||
| const DiscIO::FileSystem* fs = disc.GetFileSystem(partition); | ||
|
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| auto offsets = std::map<u64, std::vector<u8>>(); | ||
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| for (const auto& patch : patches) | ||
| { | ||
| if (!patch.active) | ||
| continue; | ||
|
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| const auto& file = fs->FindFileInfo(patch.path); | ||
| if (file) | ||
| { | ||
| for (const auto& entry : patch.entries) | ||
| { | ||
| u64 partition_offset = file->GetOffset() + entry.address; | ||
| std::vector<u8> data; | ||
| switch (entry.type) | ||
| { | ||
| case PatchEngine::PatchType::Patch32Bit: | ||
| data.push_back(static_cast<u8>(entry.value >> 24)); | ||
| data.push_back(static_cast<u8>(entry.value >> 16)); | ||
| // [[fallthrough]]; | ||
| case PatchEngine::PatchType::Patch16Bit: | ||
| data.push_back(static_cast<u8>(entry.value >> 8)); | ||
| // [[fallthrough]]; | ||
| case PatchEngine::PatchType::Patch8Bit: | ||
| data.push_back(static_cast<u8>(entry.value)); | ||
| break; | ||
| default: | ||
| // unknown patch type | ||
| // In the future we could add support for larger patch entries. | ||
|
|
||
| // Downstream code deals with vectors of bytes which could be arbitrary length | ||
| break; | ||
| } | ||
| offsets.emplace(partition_offset, data); | ||
| } | ||
|
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| INFO_LOG(ACTIONREPLAY, "Applied patch '%s' to file '%s'", patch.name.c_str(), | ||
| patch.path.c_str()); | ||
| } | ||
| } | ||
|
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| return offsets; | ||
| } | ||
|
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| static void applyPatchesToBuffer(u64 offset, u64 length, u8* buffer, | ||
| std::map<u64, std::vector<u8>> patches) | ||
| { | ||
| u64 end_offset = offset + length; | ||
|
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| // Scan through patches which might overlap our current read request and apply them | ||
|
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| // Because the patches are variably sized, we scan in reverse order to take advantage | ||
| // of upper_bound, which gives us the first patch that starts after the read buffer. | ||
| auto it = patches.upper_bound(end_offset); | ||
|
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| while (it-- != patches.begin()) // Loop backwards until start of s_disc_patches | ||
| { | ||
| if (it->first + it->second.size() < offset) | ||
| { | ||
| // Patch is before the read request, we can stop searching | ||
| return; | ||
| } | ||
| else if (it->first >= offset) | ||
| { | ||
| // Patch starts inside the read request | ||
| u64 start = it->first - offset; | ||
| std::memmove(buffer + start, it->second.data(), std::min(it->second.size(), length - start)); | ||
| INFO_LOG(DVDINTERFACE, "patch applied at %08" PRIx64, offset + start); | ||
| } | ||
| else if (it->first + it->second.size() > offset) | ||
| { | ||
| // Patch overlaps with the start of the read request | ||
| u64 start = offset - it->first; | ||
| std::memmove(buffer, it->second.data() + start, std::min(it->second.size() - start, length)); | ||
| INFO_LOG(DVDINTERFACE, "patch applied at %08" PRIx64, offset); | ||
| } | ||
| } | ||
| } | ||
|
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| bool OverlayVolume::Read(u64 offset, u64 length, u8* buffer, const Partition& partition) const | ||
| { | ||
| if (inner->Read(offset, length, buffer, partition)) | ||
| { | ||
| if (partition == | ||
| inner->GetGamePartition()) // Currently we only support patching the game partition | ||
| { | ||
| applyPatchesToBuffer(offset, length, buffer, patchOffsets); | ||
| } | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| } // namespace DiscIO |
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