06460ef0d7
This also enables an AAPT behavior that CTS tests have come to depend on. Small files that compress negatively (get larger) are stored uncompressed. Some CTS tests assume this and try to open these files by mmapping them, which is only possible if they are uncompressed. Bug: 35461578 Test: make aapt2_tests Change-Id: Id622a6150fe72477ad65d67d1bad897a8ee2ffb9
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*
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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/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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// 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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const Source& GetSource() const override { return file_->GetSource(); }
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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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};
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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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