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https://github.com/RGBCube/serenity
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2716a9e2d7
I also added a generator cache to FileHandle. This way, multiple reads to a generated file (i.e in a synthfs) can transparently handle multiple calls to read() without the contents changing between calls. The cache is discarded at EOF (or when the FileHandle is destroyed.)
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
#pragma once
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#include "FileSystem.h"
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#include "UnixTypes.h"
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#include <AK/HashMap.h>
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class SyntheticFileSystem : public FileSystem {
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public:
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virtual ~SyntheticFileSystem() override;
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static RetainPtr<SyntheticFileSystem> create();
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virtual bool initialize() override;
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virtual const char* className() const override;
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virtual InodeIdentifier rootInode() const override;
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virtual bool writeInode(InodeIdentifier, const ByteBuffer&) override;
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virtual bool enumerateDirectoryInode(InodeIdentifier, Function<bool(const DirectoryEntry&)>) const override;
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virtual InodeMetadata inodeMetadata(InodeIdentifier) const override;
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virtual bool setModificationTime(InodeIdentifier, dword timestamp) override;
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virtual InodeIdentifier createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t, unsigned size) override;
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virtual Unix::ssize_t readInodeBytes(InodeIdentifier, Unix::off_t offset, Unix::size_t count, byte* buffer, FileHandle*) const override;
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virtual InodeIdentifier makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t) override;
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protected:
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typedef unsigned InodeIndex;
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InodeIndex generateInodeIndex();
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static constexpr InodeIndex RootInodeIndex = 1;
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SyntheticFileSystem();
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struct File {
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String name;
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InodeMetadata metadata;
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InodeIdentifier parent;
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ByteBuffer data;
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Function<ByteBuffer()> generator;
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Vector<File*> children;
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};
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OwnPtr<File> createDirectory(String&& name);
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OwnPtr<File> createTextFile(String&& name, String&& text);
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OwnPtr<File> createGeneratedFile(String&& name, Function<ByteBuffer()>&&);
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InodeIdentifier addFile(OwnPtr<File>&&, InodeIndex parent = RootInodeIndex);
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bool removeFile(InodeIndex);
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private:
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InodeIndex m_nextInodeIndex { 2 };
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HashMap<InodeIndex, OwnPtr<File>> m_inodes;
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};
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