A new, unified, application analysis utility by grendello · Pull Request #10267 · dotnet/android

tools/apput/projects/.placeholder

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		This directory will contain .csproj files to be used by 3rd parties (e.g. XABT tests)

tools/apput/src/Android/ARSCHeader.cs

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+    using System;
+    using System.IO;
+    namespace ApplicationUtility;
+    class ARSCHeader
+    {
+    	// This is the minimal size such a header must have. There might be other header data too!
+    	const long MinimumSize = 2 + 2 + 4;
+    	readonly long start;
+    	readonly uint size;
+    	readonly ushort type;
+    	readonly ushort headerSize;
+    	readonly bool unknownType;
+    	public AndroidManifestChunkType Type    => unknownType ? AndroidManifestChunkType.Null : (AndroidManifestChunkType)type;
+    	public ushort TypeRaw    => type;
+    	public ushort HeaderSize => headerSize;
+    	public uint Size         => size;
+    	public long End          => start + (long)size;
+    	public ARSCHeader (Stream data, AndroidManifestChunkType? expectedType = null)
+    	{
+    		start = data.Position;
+    		if (data.Length < start + MinimumSize) {
+    			throw new InvalidDataException ($"Input data not large enough. Offset: {start}");
+    		}
+    		// Data in AXML is little-endian, which is fortuitous as that's the only format BinaryReader understands.
+    		using BinaryReader reader = Utilities.GetReaderAndRewindStream (data, rewindStream: false);
+    		// ushort: type
+    		// ushort: header_size
+    		// uint: size
+    		type = reader.ReadUInt16 ();
+    		headerSize = reader.ReadUInt16 ();
+    		// Total size of the chunk, including the header
+    		size = reader.ReadUInt32 ();
+    		if (expectedType != null && type != (ushort)expectedType) {
+    			throw new InvalidOperationException ($"Header type is not equal to the expected type ({expectedType}): got 0x{type:x}, expected 0x{(ushort)expectedType:x}");
+    		}
+    		unknownType = !Enum.IsDefined (typeof(AndroidManifestChunkType), type);
+    		if (headerSize < MinimumSize) {
+    			throw new InvalidDataException ($"Declared header size is smaller than required size of {MinimumSize}. Offset: {start}");
+    		}
+    		if (size < MinimumSize) {
+    			throw new InvalidDataException ($"Declared chunk size is smaller than required size of {MinimumSize}. Offset: {start}");
+    		}
+    		if (size < headerSize) {
+    			throw new InvalidDataException ($"Declared chunk size ({size}) is smaller than header size ({headerSize})! Offset: {start}");
+    		}
+    	}
+    }

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