/// <summary>
/// Creates a <see cref="JavaClass"/> instance from bytes.
/// </summary>
/// <param name="stream">The stream to create the class file from.</param>
/// <returns>A new <see cref="JavaClass"/> instance.</returns>
public static JavaClass Create(Stream stream)
{
Guard.NotNull(ref stream, nameof(stream));
JavaClass result = new JavaClass();
result.Magic = stream.ReadInteger();
result.MinorVersion = stream.ReadShort();
result.MajorVersion = stream.ReadShort();
result.ConstantPoolCount = stream.ReadShort();
result.ConstantPool = ReadConstants(stream, result.ConstantPoolCount);
result.AccessFlags = (JavaClassAccessFlags)stream.ReadShort();
result.ThisClassIndex = stream.ReadShort();
result.SuperClassIndex = stream.ReadShort();
result.InterfacesCount = stream.ReadShort();
result.Interfaces = stream.ReadShorts(result.InterfacesCount);
result.FieldsCount = stream.ReadShort();
result.Fields = ReadFields(stream, result.FieldsCount, result.ConstantPool);
result.MethodsCount = stream.ReadShort();
result.Methods = ReadMethods(stream, result.MethodsCount, result.ConstantPool);
result.AttributesCount = stream.ReadShort();
result.Attributes = JavaAttribute.ReadFromStream(stream, result.AttributesCount, result.ConstantPool);
return(result);
}
/// <summary>
/// Reads a method from the stream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="constantPool">The constant pool used for finding the attribute names.</param>
/// <returns>The method read from the stream.</returns>
private static JavaMethod ReadMethod(Stream stream, JavaConstantPool constantPool)
{
JavaMethodAccessFlags flags = (JavaMethodAccessFlags)stream.ReadShort();
ushort nameIndex = stream.ReadShort();
ushort descriptorIndex = stream.ReadShort();
ushort attributesCount = stream.ReadShort();
IJavaAttribute[] attributes = JavaAttribute.ReadFromStream(stream, attributesCount, constantPool);
return(new JavaMethod(flags, nameIndex, descriptorIndex, attributesCount, attributes));
}
public static void SkipAll(ByteReader reader)
{
// ATTRIBUTE POOL LENGTH (U2)
int length = reader.ReadShort();
for (int i = 0; i < length; i++)
{
JavaAttribute.Skip(reader);
}
}
public static JavaAttribute[] ReadAll(ByteReader reader, JavaConstant[] constants)
{
// ATTRIBUTE POOL LENGTH (U2)
int length = reader.ReadShort();
JavaAttribute[] attributes = new JavaAttribute[length];
for (int i = 0; i < length; i++)
{
attributes[i] = JavaAttribute.Read(reader, constants);
}
return(attributes);
}
public static JavaAttribute Read(ByteReader reader, JavaConstant[] constants)
{
// ATTRIBUTE NAME INDEX (U2)
string tag = (string)constants[reader.ReadShort() - 1].Value;
// ATTRIBUTE LENGTH (U4)
int length = reader.ReadInt();
switch (tag)
{
case "RuntimeVisibleAnnotations":
return(JavaAttribute.ReadRuntimeVisibleAnnotations(reader, constants));
default:
reader.Skip(length);
return(null);
}
}
