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Fabricated Runtime Resource Overlays are overlays that are generated
at runtime and are stored in the data/ partition.
The system can fabricate RROs at runtime to dynamically theme the
device. Idmaps can now be created from APK RROs and fabricated RROs.
Rather than operating on ApkAssets, libidmap2 now operates on abstract
resource "containers" that supply resource values. Target resource
containers implement methods needed to query overlayable and target
overlay information. Currently only APKs can be loaded as target
resource containers. Overlay resource containers implement methods to
supply the mapping of target resource to overlay value and other
overlay information.
The format of a fabricated RRO is as follows:
0x00 - 0x04 : fabricated overlay magic (always FRRO)
0x04 - 0x08 : file format version
0x08 - 0x0c : crc of version + proto data
0x0c - EOF : proto fabricated overlay data
The magic is used to quickly detect if the file is a fabricated overlay.
The version is incremented whenever backwards incompatible changes are
made to the proto file format. Idmap must always be able to upgrade
fabricated overlays from previous versions to new versions, so all
previous versions must be checked into the tree.
Bug: 172471315
Test: libidmap2_tests && libandroidfw_tests
Change-Id: I4c9f29da278672e5695fb57d131a44c11a835180
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Idmap2 currently reads android:targetPackage and android:targetName
from overlay manifests by looking for an attribute with the name of
the attribute resource.
This fixes the divergence from package parsing by finding the
attributes using their resource ids.
Bug: 175060836
Test: libidmap2_tests
Change-Id: I09965e5880a1e6c48c3f8077db0c595484804ce7
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Bug: 130324774
Test: builds
Change-Id: I2cf9d3aa268ffe38e525fadee9d81fc6aefe19b1
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Bug: 120024673
Test: mmm frameworks/base/cmds/idmap2; check output
Change-Id: I8768169fb7b541eb6b1aa3311c46a710eb71aac9
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Bug: 120024673
Test: mmm frameworks/base/cmds/idmap2; check output
Change-Id: I1565afac8d34e4347d8c946228d1134211e8b435
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Introduce a new type Result<T> to indicate if an operation succeeded or
not, and if it did, to hold the return value of the operation. This is
the same as how std::pair<bool, T> is already used in the codebase, so
replace all instances with Result<T> to improve clarity.
Result<T> is simply an alias for std::optional<T>. The difference is
semantic: use Result<T> as the return value for functions that can fail,
use std::optional<T> when values are truly optional. This is modelled
after Rust's std::result and std::option.
A future change may graduate Result<T> to a proper class which can hold
additional details on why an operation failed, such as a string or an
error code. As a special case, continue to use std::unique_ptr<T>
instead of Result<std::unique_ptr<T>> for now: the latter would increase
code complexity without added benefit.
Test: make idmap2_tests
Change-Id: I2a8355107ed2b6485409e5e655a84cf1e20b9911
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idmap2 is a reboot of the idmap project. The project aims to
- use modern C++
- greatly improve test and debug support
- interface towards AssetManager2 (instead of AssetManager)
- provide a solid foundation to add support for new features
To make it easier to verify correctness, this first version of idmap2 is
feature equivalent to idmap. Later versions will add support for new
features such as <overlayable>.
Bug: 78815803
Test: make idmap2_tests
Change-Id: I1d806dc875a493e730ab55d2fdb027618e586d16
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