[Question Only] : Arsc

[jhay06]

Would like to ask where does resources.arsc reads and parsed , what file ? thank you

[mediaexplorer74]

Hi, after a couple of years. Thanks for the good question. Oh, I somehow moved away from C# development, because age makes it known. But lately, I've been interested in exploring something with AI. Anyway, I installed TraeIDE, opened this project in it and set the AI (Claude) Your difficult question about parsing resources.arsc. I'm sharing his answer here:

How resources.arsc is Read and Parsed in AstoriaUWP

After examining the codebase, I can provide a comprehensive overview of how resources.arsc is read and parsed in the AstoriaUWP project:

Main Components Involved

1. AbstractApkParser.cs - Contains the parseResourceTable() method that initiates the parsing process:

• Reads the resources.arsc file into a byte array
• Creates a ResourceTableParser instance
• Calls the parser's parse() method
• Stores the resulting ResourceTable and locales

2. ResourceTableParser.cs - The primary class responsible for parsing the resource table:

• Reads the resource file header
• Processes string pools
• Iterates through packages
• Handles different chunk types (TABLE_TYPE_SPEC, TABLE_TYPE, TABLE_PACKAGE, TABLE_LIBRARY)
• Creates and populates the ResourceTable structure

3. ApkResourceFinder.cs - An alternative implementation that processes resources.arsc:

• Defines constants for resource types (RES_STRING_POOL_TYPE, RES_TABLE_TYPE, etc.)
• Contains the initialize() method that reads resources.arsc into a byte array
• Implements processResourceTable() to parse the resource table
• Processes different block types and extracts string pools
• Handles package data, type strings, and key strings

4. DroidApp.cs - Handles APK extraction and resource access:

• Extracts the APK contents including resources.arsc
• Reads resources.arsc into a byte array
• Passes the resources.arsc data to ApkReader for processing

5. ApkReader.cs - Extracts information from resources.arsc:

• Uses ApkResourceFinder to process the resource table
• Resolves resource IDs for app icons, labels, and version information

6. ResourceTable.cs - Defines the structure that holds the parsed resource data:

• Contains a map of resource packages
• Stores the string pool
• Provides methods to access resources

Parsing Process Flow

1. The APK file is extracted, and resources.arsc is read into a byte array

2. The byte array is passed to either ResourceTableParser or ApkResourceFinder

3. The parser reads the file header and validates it

4. String pools are processed to extract strings

5. The parser iterates through packages and processes:

• Type specifications
• Type definitions
• Resource entries

6. The parsed data is organized into a ResourceTable structure

7. Applications can then access resources using resource IDs

This parsing process allows the AstoriaUWP project to access Android resources, including strings, drawables, and other assets defined in the APK's resources.arsc file.

Best,
MediaExplorer