Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 1 | // Copyright 2021, The Android Open Source Project |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | //! Read/write metadata blob for VM payload image. The blob is supposed to be used as a metadata |
| 16 | //! partition in the VM payload image. |
| 17 | //! The layout of metadata blob is like: |
| 18 | //! 4 bytes : size(N) in big endian |
| 19 | //! N bytes : protobuf message for Metadata |
| 20 | |
Jooyung Han | 14e5a8e | 2021-07-06 20:48:38 +0900 | [diff] [blame] | 21 | use anyhow::Result; |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 22 | use protobuf::Message; |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 23 | use std::io::Read; |
| 24 | use std::io::Write; |
| 25 | |
Alan Stokes | 0d1ef78 | 2022-09-27 13:46:35 +0100 | [diff] [blame] | 26 | pub use microdroid_metadata::metadata::{ |
Ludovic Barman | 93ee308 | 2023-06-20 12:18:43 +0000 | [diff] [blame] | 27 | metadata::Payload as PayloadMetadata, ApexPayload, ApkPayload, Metadata, PayloadConfig, |
Alan Stokes | 0d1ef78 | 2022-09-27 13:46:35 +0100 | [diff] [blame] | 28 | }; |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 29 | |
| 30 | /// Reads a metadata from a reader |
Jooyung Han | 14e5a8e | 2021-07-06 20:48:38 +0900 | [diff] [blame] | 31 | pub fn read_metadata<T: Read>(mut r: T) -> Result<Metadata> { |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 32 | let mut buf = [0u8; 4]; |
| 33 | r.read_exact(&mut buf)?; |
| 34 | let size = i32::from_be_bytes(buf); |
| 35 | Ok(Metadata::parse_from_reader(&mut r.take(size as u64))?) |
| 36 | } |
| 37 | |
| 38 | /// Writes a metadata to a writer |
Jooyung Han | 14e5a8e | 2021-07-06 20:48:38 +0900 | [diff] [blame] | 39 | pub fn write_metadata<T: Write>(metadata: &Metadata, mut w: T) -> Result<()> { |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 40 | let mut buf = Vec::new(); |
| 41 | metadata.write_to_writer(&mut buf)?; |
| 42 | w.write_all(&(buf.len() as i32).to_be_bytes())?; |
Jooyung Han | 14e5a8e | 2021-07-06 20:48:38 +0900 | [diff] [blame] | 43 | w.write_all(&buf)?; |
| 44 | Ok(()) |
Jooyung Han | f1e0086 | 2021-06-25 12:02:33 +0900 | [diff] [blame] | 45 | } |