打开文件和读取文件内容一次完成，生成的效果与第一个显式示例相同。

You open the file and read its contents all at once, producing the same result as the first, explicit example.

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对于BAR文件中的每个文件，该方法获取文件名并建立一个流读取文件内容。

For every file contained in the BAR file, it obtains the file name and opens a stream for the file content.

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DMA模块从磁盘中读取文件内容，并将其存储在内核空间的缓冲区内，完成了第1次复制。

The first copy is performed by the DMA engine, which reads file contents from the disk and stores them into a kernel address space buffer.

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