The error is caused by the fact that there is an overhead of two bytes for varying length and a one-byte overhead for null.

造成这个错误的原因是，变化的长度占用 2 字节，null 占用 1 字节。

youdao

The most common constructs -- such as tags, attributes, and attribute values -- are reduced to one-byte tokens, with some literal text left in the clear.

XML 中最常用的结构，如标签、属性、以及属性值等等，都缩减成只占一个字节的标记，其他一些文字可保留为原文。

youdao

One or more bitmaps — a message will always have a one-byte primary bitmap whose individual bits indicate which later fields are present in this particular message instance.

一个或多个位图——消息通常包含一个1字节的主位图，其中的各个位表示哪些字段将显示在这个特定消息实例中。

youdao

So a char is one byte, which is bits -- how many?

所以char类型占了1个字节，--那是多少位？

哈佛公开课 - 计算机科学课程节选

The key to cracking that nut is apparently the new thermal assisted optical element Fujitsu's developed, allowing for an ultra-tiny sub-hundred nanometer optical spot size, which in turn should enable recording on the one terabit (not byte, let's not get crazy here) per square inch level.

ENGADGET: Fujitsu building a bigger, smaller hard drive