Function code_page_decode

crates/vm/src/stdlib/_codecs.rs:1361–1394

(
        args: CodePageDecodeArgs,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn code_page_decode(
        args: CodePageDecodeArgs,
        vm: &VirtualMachine,
    ) -> PyResult<(PyStrRef, usize)> {
        use crate::common::wtf8::Wtf8Buf;

        if args.code_page < 0 {
            return Err(vm.new_value_error("invalid code page number"));
        }
        let errors = args.errors.as_ref().map(|s| s.as_str()).unwrap_or("strict");
        let code_page = args.code_page as u32;
        let data = args.data.borrow_buf();
        let is_final = args.r#final;

        if data.is_empty() {
            return Ok((vm.ctx.empty_str.to_owned(), 0));
        }

        let encoding_name = code_page_encoding_name(code_page);

        // Fast path: try to decode the whole buffer with strict flags
        match try_decode_code_page_strict(code_page, &data, vm)? {
            Some(wide) => {
                let s = Wtf8Buf::from_wide(&wide);
                return Ok((vm.ctx.new_str(s), data.len()));
            }
            None => {
                // Decode error - fall through to slow path
            }
        }

        // Slow path: byte by byte with error handling
        decode_code_page_errors(code_page, &data, errors, is_final, &encoding_name, vm)
    }
}