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#pragma once
#include "FileSystem.h"
#include "UnixTypes.h"
#include <AK/HashMap.h>
class SynthFSInode;
class SyntheticFileSystem : public FileSystem {
public:
virtual ~SyntheticFileSystem() override;
static RetainPtr<SyntheticFileSystem> create();
virtual bool initialize() override;
virtual const char* className() const override;
virtual InodeIdentifier rootInode() const override;
virtual bool writeInode(InodeIdentifier, const ByteBuffer&) override;
virtual bool enumerateDirectoryInode(InodeIdentifier, Function<bool(const DirectoryEntry&)>) const override;
virtual InodeMetadata inodeMetadata(InodeIdentifier) const override;
virtual bool setModificationTime(InodeIdentifier, dword timestamp) override;
virtual InodeIdentifier createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size) override;
virtual Unix::ssize_t readInodeBytes(InodeIdentifier, Unix::off_t offset, Unix::size_t count, byte* buffer, FileDescriptor*) const override;
virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) override;
virtual InodeIdentifier find_parent_of_inode(InodeIdentifier) const override;
virtual RetainPtr<CoreInode> get_inode(InodeIdentifier) const override;
protected:
typedef unsigned InodeIndex;
InodeIndex generateInodeIndex();
static constexpr InodeIndex RootInodeIndex = 1;
SyntheticFileSystem();
RetainPtr<SynthFSInode> create_directory(String&& name);
RetainPtr<SynthFSInode> create_text_file(String&& name, ByteBuffer&&, Unix::mode_t = 0010644);
RetainPtr<SynthFSInode> create_generated_file(String&& name, Function<ByteBuffer()>&&, Unix::mode_t = 0100644);
InodeIdentifier addFile(RetainPtr<SynthFSInode>&&, InodeIndex parent = RootInodeIndex);
bool removeFile(InodeIndex);
private:
InodeIndex m_nextInodeIndex { 2 };
HashMap<InodeIndex, RetainPtr<SynthFSInode>> m_inodes;
};
class SynthFSInode final : public CoreInode {
friend class SyntheticFileSystem;
public:
virtual ~SynthFSInode() override;
private:
// ^CoreInode
virtual Unix::ssize_t read_bytes(Unix::off_t, Unix::size_t, byte* buffer, FileDescriptor*) override;
virtual void populate_metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FileSystem::DirectoryEntry&)>) override;
SyntheticFileSystem& fs();
const SyntheticFileSystem& fs() const;
SynthFSInode(SyntheticFileSystem&, unsigned index);
String m_name;
InodeIdentifier m_parent;
ByteBuffer m_data;
Function<ByteBuffer()> m_generator;
Vector<SynthFSInode*> m_children;
};
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