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RiivolutionPatcher: Load external files with a layer of indirection during the patching process to properly resolve the paths given in the XML.

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This also may eventually allow loading patches from sources other than the 1:1 expected file structure host file system, such as memory or an archive file.
This commit is contained in:
Admiral H. Curtiss
2021-09-28 06:12:45 +02:00
parent 175f225ac1
commit 6ec4af7ea4
5 changed files with 260 additions and 51 deletions
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50
Source/Core/DiscIO/RiivolutionPatcher.h
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@ -3,17 +3,57 @@
#pragma once
#include <string>
#include <string_view>
#include <vector>
#include "DiscIO/DirectoryBlob.h"
#include "DiscIO/RiivolutionParser.h"
namespace DiscIO
{
struct FSTBuilderNode;
}
namespace DiscIO::Riivolution
{
class FileDataLoader
{
public:
struct Node
{
std::string m_filename;
bool m_is_directory;
};
virtual ~FileDataLoader();
virtual std::optional<u64> GetExternalFileSize(std::string_view external_relative_path) = 0;
virtual std::vector<u8> GetFileContents(std::string_view external_relative_path) = 0;
virtual std::vector<Node> GetFolderContents(std::string_view external_relative_path) = 0;
virtual BuilderContentSource MakeContentSource(std::string_view external_relative_path,
u64 external_offset, u64 external_size,
u64 disc_offset) = 0;
};
class FileDataLoaderHostFS : public FileDataLoader
{
public:
// sd_root should be an absolute path to the folder representing our virtual SD card
// xml_path should be an absolute path to the parsed XML file
// patch_root should be the 'root' attribute given in the 'patch' or 'wiiroot' XML element
FileDataLoaderHostFS(std::string sd_root, const std::string& xml_path,
std::string_view patch_root);
std::optional<u64> GetExternalFileSize(std::string_view external_relative_path) override;
std::vector<u8> GetFileContents(std::string_view external_relative_path) override;
std::vector<FileDataLoader::Node>
GetFolderContents(std::string_view external_relative_path) override;
BuilderContentSource MakeContentSource(std::string_view external_relative_path,
u64 external_offset, u64 external_size,
u64 disc_offset) override;
private:
std::optional<std::string> MakeAbsoluteFromRelative(std::string_view external_relative_path);
std::string m_sd_root;
std::string m_patch_root;
};
void ApplyPatchesToFiles(const std::vector<Patch>& patches,
std::vector<DiscIO::FSTBuilderNode>* fst,
DiscIO::FSTBuilderNode* dol_node);