我们从当前文档偏移位置开始，向后读取文档字符。

Starting at the current document offset, we read document characters backwards.

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DB 2将数据写在512字节(HP - UX上是1024)的偏移位置上，这就是开始复制或者写入数据的位置。

DB2 places its data starting at the 512 byte offset (1024 on HP-UX) so this is where you should start copying from in the old location, and where you should start writing to in the new location.

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endPoint记录最后一个内存块中第一个空闲字节的偏移位置。

The endPoint records the first free byte's offset location into the last memory block.

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