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231 lines
11 KiB
C++
231 lines
11 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include <string>
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#include <string_view>
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#include <type_traits>
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#include <vector>
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#include "boost/optional.hpp"
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#include "common/common_types.h"
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namespace FileSys {
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struct VfsFile;
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struct VfsDirectory;
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// Convenience typedefs to use VfsDirectory and VfsFile
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using VirtualDir = std::shared_ptr<FileSys::VfsDirectory>;
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using VirtualFile = std::shared_ptr<FileSys::VfsFile>;
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// A class representing a file in an abstract filesystem.
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struct VfsFile : NonCopyable {
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virtual ~VfsFile();
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// Retrieves the file name.
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virtual std::string GetName() const = 0;
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// Retrieves the extension of the file name.
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virtual std::string GetExtension() const;
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// Retrieves the size of the file.
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virtual size_t GetSize() const = 0;
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// Resizes the file to new_size. Returns whether or not the operation was successful.
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virtual bool Resize(size_t new_size) = 0;
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// Gets a pointer to the directory containing this file, returning nullptr if there is none.
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virtual std::shared_ptr<VfsDirectory> GetContainingDirectory() const = 0;
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// Returns whether or not the file can be written to.
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virtual bool IsWritable() const = 0;
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// Returns whether or not the file can be read from.
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virtual bool IsReadable() const = 0;
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// The primary method of reading from the file. Reads length bytes into data starting at offset
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// into file. Returns number of bytes successfully read.
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virtual size_t Read(u8* data, size_t length, size_t offset = 0) const = 0;
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// The primary method of writing to the file. Writes length bytes from data starting at offset
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// into file. Returns number of bytes successfully written.
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virtual size_t Write(const u8* data, size_t length, size_t offset = 0) = 0;
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// Reads exactly one byte at the offset provided, returning boost::none on error.
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virtual boost::optional<u8> ReadByte(size_t offset = 0) const;
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// Reads size bytes starting at offset in file into a vector.
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virtual std::vector<u8> ReadBytes(size_t size, size_t offset = 0) const;
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// Reads all the bytes from the file into a vector. Equivalent to 'file->Read(file->GetSize(),
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// 0)'
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virtual std::vector<u8> ReadAllBytes() const;
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// Reads an array of type T, size number_elements starting at offset.
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// Returns the number of bytes (sizeof(T)*number_elements) read successfully.
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template <typename T>
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size_t ReadArray(T* data, size_t number_elements, size_t offset = 0) const {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Read(reinterpret_cast<u8*>(data), number_elements * sizeof(T), offset);
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}
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// Reads size bytes into the memory starting at data starting at offset into the file.
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// Returns the number of bytes read successfully.
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template <typename T>
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size_t ReadBytes(T* data, size_t size, size_t offset = 0) const {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Read(reinterpret_cast<u8*>(data), size, offset);
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}
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// Reads one object of type T starting at offset in file.
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// Returns the number of bytes read successfully (sizeof(T)).
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template <typename T>
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size_t ReadObject(T* data, size_t offset = 0) const {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Read(reinterpret_cast<u8*>(data), sizeof(T), offset);
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}
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// Writes exactly one byte to offset in file and retuns whether or not the byte was written
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// successfully.
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virtual bool WriteByte(u8 data, size_t offset = 0);
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// Writes a vector of bytes to offset in file and returns the number of bytes successfully
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// written.
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virtual size_t WriteBytes(const std::vector<u8>& data, size_t offset = 0);
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// Writes an array of type T, size number_elements to offset in file.
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// Returns the number of bytes (sizeof(T)*number_elements) written successfully.
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template <typename T>
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size_t WriteArray(const T* data, size_t number_elements, size_t offset = 0) {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Write(data, number_elements * sizeof(T), offset);
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}
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// Writes size bytes starting at memory location data to offset in file.
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// Returns the number of bytes written successfully.
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template <typename T>
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size_t WriteBytes(const T* data, size_t size, size_t offset = 0) {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Write(reinterpret_cast<const u8*>(data), size, offset);
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}
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// Writes one object of type T to offset in file.
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// Returns the number of bytes written successfully (sizeof(T)).
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template <typename T>
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size_t WriteObject(const T& data, size_t offset = 0) {
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static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
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return Write(&data, sizeof(T), offset);
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}
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// Renames the file to name. Returns whether or not the operation was successsful.
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virtual bool Rename(std::string_view name) = 0;
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};
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// A class representing a directory in an abstract filesystem.
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struct VfsDirectory : NonCopyable {
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virtual ~VfsDirectory();
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// Retrives the file located at path as if the current directory was root. Returns nullptr if
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// not found.
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virtual std::shared_ptr<VfsFile> GetFileRelative(std::string_view path) const;
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// Calls GetFileRelative(path) on the root of the current directory.
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virtual std::shared_ptr<VfsFile> GetFileAbsolute(std::string_view path) const;
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// Retrives the directory located at path as if the current directory was root. Returns nullptr
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// if not found.
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virtual std::shared_ptr<VfsDirectory> GetDirectoryRelative(std::string_view path) const;
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// Calls GetDirectoryRelative(path) on the root of the current directory.
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virtual std::shared_ptr<VfsDirectory> GetDirectoryAbsolute(std::string_view path) const;
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// Returns a vector containing all of the files in this directory.
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virtual std::vector<std::shared_ptr<VfsFile>> GetFiles() const = 0;
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// Returns the file with filename matching name. Returns nullptr if directory dosen't have a
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// file with name.
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virtual std::shared_ptr<VfsFile> GetFile(std::string_view name) const;
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// Returns a vector containing all of the subdirectories in this directory.
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virtual std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const = 0;
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// Returns the directory with name matching name. Returns nullptr if directory dosen't have a
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// directory with name.
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virtual std::shared_ptr<VfsDirectory> GetSubdirectory(std::string_view name) const;
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// Returns whether or not the directory can be written to.
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virtual bool IsWritable() const = 0;
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// Returns whether of not the directory can be read from.
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virtual bool IsReadable() const = 0;
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// Returns whether or not the directory is the root of the current file tree.
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virtual bool IsRoot() const;
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// Returns the name of the directory.
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virtual std::string GetName() const = 0;
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// Returns the total size of all files and subdirectories in this directory.
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virtual size_t GetSize() const;
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// Returns the parent directory of this directory. Returns nullptr if this directory is root or
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// has no parent.
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virtual std::shared_ptr<VfsDirectory> GetParentDirectory() const = 0;
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// Creates a new subdirectory with name name. Returns a pointer to the new directory or nullptr
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// if the operation failed.
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virtual std::shared_ptr<VfsDirectory> CreateSubdirectory(std::string_view name) = 0;
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// Creates a new file with name name. Returns a pointer to the new file or nullptr if the
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// operation failed.
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virtual std::shared_ptr<VfsFile> CreateFile(std::string_view name) = 0;
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// Creates a new file at the path relative to this directory. Also creates directories if
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// they do not exist and is supported by this implementation. Returns nullptr on any failure.
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virtual std::shared_ptr<VfsFile> CreateFileRelative(std::string_view path);
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// Creates a new file at the path relative to root of this directory. Also creates directories
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// if they do not exist and is supported by this implementation. Returns nullptr on any failure.
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virtual std::shared_ptr<VfsFile> CreateFileAbsolute(std::string_view path);
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// Creates a new directory at the path relative to this directory. Also creates directories if
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// they do not exist and is supported by this implementation. Returns nullptr on any failure.
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virtual std::shared_ptr<VfsDirectory> CreateDirectoryRelative(std::string_view path);
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// Creates a new directory at the path relative to root of this directory. Also creates
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// directories if they do not exist and is supported by this implementation. Returns nullptr on
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// any failure.
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virtual std::shared_ptr<VfsDirectory> CreateDirectoryAbsolute(std::string_view path);
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// Deletes the subdirectory with name and returns true on success.
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virtual bool DeleteSubdirectory(std::string_view name) = 0;
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// Deletes all subdirectories and files of subdirectory with name recirsively and then deletes
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// the subdirectory. Returns true on success.
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virtual bool DeleteSubdirectoryRecursive(std::string_view name);
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// Returnes whether or not the file with name name was deleted successfully.
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virtual bool DeleteFile(std::string_view name) = 0;
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// Returns whether or not this directory was renamed to name.
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virtual bool Rename(std::string_view name) = 0;
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// Returns whether or not the file with name src was successfully copied to a new file with name
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// dest.
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virtual bool Copy(std::string_view src, std::string_view dest);
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// Interprets the file with name file instead as a directory of type directory.
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// The directory must have a constructor that takes a single argument of type
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// std::shared_ptr<VfsFile>. Allows to reinterpret container files (i.e NCA, zip, XCI, etc) as a
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// subdirectory in one call.
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template <typename Directory>
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bool InterpretAsDirectory(std::string_view file) {
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auto file_p = GetFile(file);
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if (file_p == nullptr)
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return false;
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return ReplaceFileWithSubdirectory(file, std::make_shared<Directory>(file_p));
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}
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protected:
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// Backend for InterpretAsDirectory.
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// Removes all references to file and adds a reference to dir in the directory's implementation.
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virtual bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) = 0;
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};
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// A convenience partial-implementation of VfsDirectory that stubs out methods that should only work
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// if writable. This is to avoid redundant empty methods everywhere.
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struct ReadOnlyVfsDirectory : public VfsDirectory {
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bool IsWritable() const override;
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bool IsReadable() const override;
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std::shared_ptr<VfsDirectory> CreateSubdirectory(std::string_view name) override;
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std::shared_ptr<VfsFile> CreateFile(std::string_view name) override;
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bool DeleteSubdirectory(std::string_view name) override;
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bool DeleteFile(std::string_view name) override;
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bool Rename(std::string_view name) override;
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};
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} // namespace FileSys
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