注意，因为这段代码只处理缓冲区，所以除了大写转换特有的函数调用之外几乎没有特殊代码。

Note that since this code only deals with buffers, there is almost no code except the function call which is specific to uppercase-conversion.

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因此，必须将掩码转换为一个索引(可以使用这个索引指定要处理的缓冲区)，而且进行转换时不用任何分支。

Therefore, you have to convert the mask into a single index which can then be used to specify the buffer you are processing, and you have to do it without any branching.

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处理中，针对该构造资料转换波静校正难度大、气云区转换波不易成像等难题，采取了相应的处理手段和措施。

To cope with the problems of statics and converted wave imaging over gas cloud area, several measures are adopted.

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