/// <summary>
/// Reads a single code attribute at the current position of the provided reader.
/// </summary>
/// <param name="reader">The reader to use.</param>
/// <returns>The code attribute that was read.</returns>
public static CodeAttribute FromReader(IBigEndianReader reader)
{
var contents = new CodeAttribute
{
MaxStack = reader.ReadUInt16(),
MaxLocals = reader.ReadUInt16(),
Code = reader.ReadBytes(reader.ReadInt32()),
};
ushort handlerCount = reader.ReadUInt16();
for (int i = 0; i < handlerCount; i++)
{
contents.ExceptionHandlers.Add(ExceptionHandlerInfo.FromReader(reader));
}
ushort attributeCount = reader.ReadUInt16();
for (int i = 0; i < attributeCount; i++)
{
contents.Attributes.Add(AttributeInfo.FromReader(reader));
}
return(contents);
}
/// <summary>
/// Parses a class file from a binary reader.
/// </summary>
/// <param name="reader">The reader to read from.</param>
/// <returns>The parsed class file.</returns>
/// <exception cref="BadImageFormatException">Occurs when the file does not provide a valid signature of
/// a class file.</exception>
public static JavaClassFile FromReader(IBigEndianReader reader)
{
uint magic = reader.ReadUInt32();
if (magic != Magic)
{
throw new BadImageFormatException("Image does not contain a valid class file.");
}
var file = new JavaClassFile
{
MinorVersion = reader.ReadUInt16(),
MajorVersion = reader.ReadUInt16(),
ConstantPool = ConstantPool.FromReader(reader),
AccessFlags = (ClassAccessFlags)reader.ReadUInt16(),
ThisClass = reader.ReadUInt16(),
SuperClass = reader.ReadUInt16(),
};
ushort interfaceCount = reader.ReadUInt16();
for (int i = 0; i < interfaceCount; i++)
{
file.Interfaces.Add(reader.ReadUInt16());
}
ushort fieldCount = reader.ReadUInt16();
for (int i = 0; i < fieldCount; i++)
{
file.Fields.Add(FieldInfo.FromReader(reader));
}
ushort methodCount = reader.ReadUInt16();
for (int i = 0; i < methodCount; i++)
{
file.Methods.Add(MethodInfo.FromReader(reader));
}
ushort attributeCount = reader.ReadUInt16();
for (int i = 0; i < attributeCount; i++)
{
file.Attributes.Add(AttributeInfo.FromReader(reader));
}
return(file);
}