Function write

modules/llrt_buffer/src/buffer.rs:426–461

(
    this: This<Object<'js>>,
    ctx: Ctx<'js>,
    string: String,
    args: Rest<Value<'js>>,
)

    });

    let length = (end_index - start_index).max(0) as usize;
    let new_offset = (view_offset + start_index).max(0) as usize;

    Buffer::from_array_buffer_offset_length(&ctx, array_buffer, new_offset, length)
}

fn to_string(
    this: This<Object<'_>>,
    ctx: Ctx,
    encoding: Opt<String>,
    start: Opt<i32>,
    end: Opt<i32>,
) -> Result<String> {
    let typed_array = TypedArray::<u8>::from_object(this.0)?;
    let bytes: &[u8] = typed_array.as_ref();

    let start = start
        .0
        .map(|s| s.max(0) as usize)
        .unwrap_or(0)
        .min(bytes.len());
    let end = end
        .0
        .map(|e| e.max(0) as usize)
        .unwrap_or(bytes.len())
        .min(bytes.len());
    let bytes = &bytes[start..end];

    let encoder = Encoder::from_optional_str(encoding.as_deref()).or_throw(&ctx)?;
    encoder.encode_to_string(bytes, true).or_throw(&ctx)
}

fn write<'js>(
    this: This<Object<'js>>,
    ctx: Ctx<'js>,
    string: String,
    args: Rest<Value<'js>>,
) -> Result<usize> {
    let (offset, length, encoding) = get_write_parameters(&ctx, &args, this.0.len())?;