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ExtSaveData work

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wheremyfoodat 2023-01-22 14:23:28 +02:00
parent 902b877c40
commit 995dfb81df
12 changed files with 68 additions and 28 deletions
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25
include/fs/archive_base.hpp
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@ -1,5 +1,6 @@
#pragma once
#include <cassert>
#include <cstdio>
#include <optional>
#include <string>
#include <type_traits>
@ -72,14 +73,24 @@ struct FSPath {
}
};
class ArchiveBase;
struct FilePerms {
u32 raw;
FilePerms(u32 val) : raw(val) {}
bool read() const { return (raw & 1) != 0; }
bool write() const { return (raw & 2) != 0; }
bool create() const { return (raw & 4) != 0; }
};
class ArchiveBase;
struct FileSession {
ArchiveBase* archive = nullptr;
FILE* fd = nullptr; // File descriptor for file sessions that require them.
FSPath path;
bool isOpen;
FileSession(ArchiveBase* archive, const FSPath& filePath, bool isOpen = true) : archive(archive), path(path), isOpen(isOpen) {}
FileSession(ArchiveBase* archive, const FSPath& filePath, FILE* fd, bool isOpen = true) :
archive(archive), path(path), fd(fd), isOpen(isOpen) {}
};
struct ArchiveSession {
@ -90,9 +101,16 @@ struct ArchiveSession {
ArchiveSession(ArchiveBase* archive, const FSPath& filePath, bool isOpen = true) : archive(archive), path(path), isOpen(isOpen) {}
};
// Represents a file descriptor obtained from OpenFile. If the optional is nullopt, opening the file failed.
// Otherwise the fd of the opened file is returned (or nullptr if the opened file doesn't require one)
using FileDescriptor = std::optional<FILE*>;
class ArchiveBase {
protected:
using Handle = u32;
static constexpr FileDescriptor NoFile = nullptr;
static constexpr FileDescriptor FileError = std::nullopt;
Memory& mem;
// Returns if a specified 3DS path in UTF16 or ASCII format is safe or not
@ -143,7 +161,8 @@ protected:
public:
virtual std::string name() = 0;
virtual u64 getFreeBytes() = 0;
virtual bool openFile(const FSPath& path) = 0;
// Returns nullopt if opening the file failed, otherwise returns a file descriptor to it (nullptr if none is needed)
virtual FileDescriptor openFile(const FSPath& path, const FilePerms& perms) = 0;
virtual ArchiveBase* openArchive(const FSPath& path) = 0;