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114 lines
3.4 KiB
114 lines
3.4 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef AAPT_IO_FILE_H
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#define AAPT_IO_FILE_H
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#include <list>
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#include <memory>
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#include <vector>
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#include "android-base/macros.h"
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#include "Source.h"
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#include "io/Data.h"
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#include "util/Files.h"
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#include "util/Util.h"
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namespace aapt {
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namespace io {
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// Interface for a file, which could be a real file on the file system, or a
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// file inside a ZIP archive.
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class IFile {
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public:
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virtual ~IFile() = default;
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// Open the file and return it as a block of contiguous memory. How this
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// occurs is implementation dependent. For example, if this is a file on the file
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// system, it may simply mmap the contents. If this file represents a compressed file in a
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// ZIP archive, it may need to inflate it to memory, incurring a copy.
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// Returns nullptr on failure.
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virtual std::unique_ptr<IData> OpenAsData() = 0;
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virtual std::unique_ptr<io::InputStream> OpenInputStream() = 0;
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// Returns the source of this file. This is for presentation to the user and
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// may not be a valid file system path (for example, it may contain a '@' sign to separate
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// the files within a ZIP archive from the path to the containing ZIP archive.
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virtual const Source& GetSource() const = 0;
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IFile* CreateFileSegment(size_t offset, size_t len);
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// Returns whether the file was compressed before it was stored in memory.
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virtual bool WasCompressed() {
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return false;
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}
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private:
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// Any segments created from this IFile need to be owned by this IFile, so
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// keep them
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// in a list. This will never be read, so we prefer better insertion
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// performance
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// than cache locality, hence the list.
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std::list<std::unique_ptr<IFile>> segments_;
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};
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// An IFile that wraps an underlying IFile but limits it to a subsection of that file.
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class FileSegment : public IFile {
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public:
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explicit FileSegment(IFile* file, size_t offset, size_t len)
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: file_(file), offset_(offset), len_(len) {}
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std::unique_ptr<IData> OpenAsData() override;
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std::unique_ptr<io::InputStream> OpenInputStream() override;
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const Source& GetSource() const override {
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return file_->GetSource();
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(FileSegment);
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IFile* file_;
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size_t offset_;
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size_t len_;
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};
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class IFileCollectionIterator {
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public:
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virtual ~IFileCollectionIterator() = default;
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virtual bool HasNext() = 0;
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virtual IFile* Next() = 0;
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};
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// Interface for a collection of files, all of which share a common source. That source may
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// simply be the filesystem, or a ZIP archive.
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class IFileCollection {
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public:
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virtual ~IFileCollection() = default;
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virtual IFile* FindFile(const android::StringPiece& path) = 0;
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virtual std::unique_ptr<IFileCollectionIterator> Iterator() = 0;
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virtual char GetDirSeparator() = 0;
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};
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} // namespace io
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} // namespace aapt
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#endif /* AAPT_IO_FILE_H */
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