从长度为无符号整数的ByteBuffer读取UTF-8字符串

我试图通过java.nio.ByteBuffer读取UTF8字符串。大小是一个无符号的int,当然,Java没有。我已将该值读入一个long中,以便获得该值。

我遇到的下一个问题是,我无法创建一个长字节数组,将长字节转换回int将导致它被签名。

我还尝试在缓冲区上使用limit(),但它同样适用于int-not-long。

关于如何从ByteBuffer读取可能长度为无符号int的UTF8字符串的任何想法。

编辑:

Here is an example of the issue .

SourceDebugExtension_attribute {
       u2 attribute_name_index;
       u4 attribute_length;
       u1 debug_extension[attribute_length];
    }

attribute_name_index
    The value of the attribute_name_index item must be a valid index into the constant_pool table. The constant_pool entry at that index must be a CONSTANT_Utf8_info structure representing the string "SourceDebugExtension".

attribute_length
    The value of the attribute_length item indicates the length of the attribute, excluding the initial six bytes. The value of the attribute_length item is thus the number of bytes in the debug_extension[] item.

debug_extension[]
    The debug_extension array holds a string, which must be in UTF-8 format. There is no terminating zero byte.

    The string in the debug_extension item will be interpreted as extended debugging information. The content of this string has no semantic effect on the Java Virtual Machine.

因此,从技术角度来看,类文件中可能有一个长度为完整u4(无符号,4字节)的字符串。

如果UTF8字符串的大小有限制(我不是UTF8专家,所以可能有这样的限制),那么这些不会成为问题。