0045116606
AAPT Container Format (.apc) is a simple container that enumerates the various intermediate files that AAPT2 generates during the compile phase. The format is defined in formats.md. For now, continue using the .flat extension for the container file, and keep making use of the .flata zip for storing multiple files. This will allow easier integration with existing build systems and allow the evolution of the APC format to better handle arbitrarily large files. Test: make aapt2_tests Change-Id: Id7216e5b76316bdd683f0fa4eaf2d2da273ba815
218 lines
5.3 KiB
C++
218 lines
5.3 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_DATA_H
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#define AAPT_IO_DATA_H
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#include <memory>
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#include "android-base/macros.h"
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#include "utils/FileMap.h"
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#include "io/Io.h"
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namespace aapt {
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namespace io {
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// Interface for a block of contiguous memory. An instance of this interface owns the data.
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class IData : public KnownSizeInputStream {
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public:
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virtual ~IData() = default;
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virtual const void* data() const = 0;
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virtual size_t size() const = 0;
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virtual size_t TotalSize() const override {
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return size();
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}
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};
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class DataSegment : public IData {
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public:
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explicit DataSegment(std::unique_ptr<IData> data, size_t offset, size_t len)
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: data_(std::move(data)), offset_(offset), len_(len), next_read_(offset) {}
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virtual ~DataSegment() = default;
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const void* data() const override {
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return static_cast<const uint8_t*>(data_->data()) + offset_;
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}
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size_t size() const override { return len_; }
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bool Next(const void** data, size_t* size) override {
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if (next_read_ == offset_ + len_) {
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return false;
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}
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*data = static_cast<const uint8_t*>(data_->data()) + next_read_;
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*size = len_ - (next_read_ - offset_);
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next_read_ = offset_ + len_;
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return true;
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}
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void BackUp(size_t count) override {
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if (count > next_read_ - offset_) {
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next_read_ = offset_;
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} else {
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next_read_ -= count;
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}
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}
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bool CanRewind() const override { return true; }
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bool Rewind() override {
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next_read_ = offset_;
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return true;
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}
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size_t ByteCount() const override { return next_read_ - offset_; }
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bool HadError() const override { return false; }
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private:
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DISALLOW_COPY_AND_ASSIGN(DataSegment);
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std::unique_ptr<IData> data_;
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size_t offset_;
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size_t len_;
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size_t next_read_;
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};
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// Implementation of IData that exposes a memory mapped file.
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// The mmapped file is owned by this object.
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class MmappedData : public IData {
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public:
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explicit MmappedData(android::FileMap&& map) : map_(std::forward<android::FileMap>(map)) {}
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virtual ~MmappedData() = default;
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const void* data() const override { return map_.getDataPtr(); }
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size_t size() const override { return map_.getDataLength(); }
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bool Next(const void** data, size_t* size) override {
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if (next_read_ == map_.getDataLength()) {
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return false;
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}
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*data = reinterpret_cast<const uint8_t*>(map_.getDataPtr()) + next_read_;
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*size = map_.getDataLength() - next_read_;
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next_read_ = map_.getDataLength();
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return true;
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}
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void BackUp(size_t count) override {
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if (count > next_read_) {
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next_read_ = 0;
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} else {
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next_read_ -= count;
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}
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}
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bool CanRewind() const override { return true; }
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bool Rewind() override {
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next_read_ = 0;
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return true;
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}
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size_t ByteCount() const override { return next_read_; }
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bool HadError() const override { return false; }
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private:
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DISALLOW_COPY_AND_ASSIGN(MmappedData);
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android::FileMap map_;
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size_t next_read_ = 0;
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};
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// Implementation of IData that exposes a block of memory that was malloc'ed (new'ed).
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// The memory is owned by this object.
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class MallocData : public IData {
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public:
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MallocData(std::unique_ptr<const uint8_t[]> data, size_t size)
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: data_(std::move(data)), size_(size) {}
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virtual ~MallocData() = default;
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const void* data() const override { return data_.get(); }
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size_t size() const override { return size_; }
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bool Next(const void** data, size_t* size) override {
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if (next_read_ == size_) {
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return false;
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}
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*data = data_.get() + next_read_;
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*size = size_ - next_read_;
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next_read_ = size_;
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return true;
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}
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void BackUp(size_t count) override {
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if (count > next_read_) {
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next_read_ = 0;
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} else {
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next_read_ -= count;
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}
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}
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bool CanRewind() const override { return true; }
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bool Rewind() override {
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next_read_ = 0;
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return true;
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}
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size_t ByteCount() const override { return next_read_; }
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bool HadError() const override { return false; }
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private:
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DISALLOW_COPY_AND_ASSIGN(MallocData);
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std::unique_ptr<const uint8_t[]> data_;
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size_t size_;
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size_t next_read_ = 0;
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};
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// When mmap fails because the file has length 0, we use the EmptyData to simulate data of length 0.
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class EmptyData : public IData {
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public:
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virtual ~EmptyData() = default;
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const void* data() const override {
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static const uint8_t d = 0;
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return &d;
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}
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size_t size() const override { return 0u; }
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bool Next(const void** /*data*/, size_t* /*size*/) override { return false; }
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void BackUp(size_t /*count*/) override {}
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bool CanRewind() const override { return true; }
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bool Rewind() override { return true; }
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size_t ByteCount() const override { return 0u; }
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bool HadError() const override { return false; }
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};
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} // namespace io
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} // namespace aapt
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#endif /* AAPT_IO_DATA_H */
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