JarFileExtensions.cs

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using System;
 
using IKVM.ByteCode.Decoding;
using IKVM.CoreLib.Jar;
using IKVM.CoreLib.Modules;
 
using static IKVM.Util.Jar.JarFileUtil;
 
namespace IKVM.Util.Jar
{
 
    internal static class JarFileExtensions
    {
 
        public static ModuleInfo GetModuleInfo(this JarFile jar)
        {
            if (jar is null)
                throw new ArgumentNullException(nameof(jar));
 
            return GetModuleInfoFromClass(jar) ?? GetModuleInfoFromManifest(jar);
        }
 
        static ModuleInfo GetModuleInfoFromClass(JarFile jar)
        {
            if (jar is null)
                throw new ArgumentNullException(nameof(jar));
 
            var e = jar.GetEntry("module-info.class");
            if (e == null)
                return null;
 
            using var s = e.Value.Open();
            using var c = ClassFile.Read(s);
            var m = ModuleDescriptor.Read(c);
            return new ModuleInfo(m.Name, m.Version);
        }
 
        static ModuleInfo GetModuleInfoFromManifest(JarFile jar)
        {
            if (jar.Manifest is null)
                return null;
 
            return new ModuleInfo(jar.Manifest.MainAttributes.TryGetValue("Automatic-Module-Name", out var name) ? name : null, default);
        }
 
    }
 
}