This encoding scheme makes it possible to encode an ASCII character with one byte, and a non-ASCII character with multiple (up to 4) bytes.
这个编码方案可以用一个字节对ASCII字符进行编码，用多个字节（最多4 字节）对非 ASCII 字符进行编码。
Base64 encoding transforms arbitrary data values into printable ASCII characters by using one ASCII character to represent each six bits of the original data.
通过对原始数据中的每六位使用一个ASCII字符来表示，Base64编码可以将任意的数据值转换为可打印的ASCII字符。
ASCII streams, for ASCII character data.
ascii流，用于ASCII字符数据。
ASCII streams, for ASCII character data.
ascii流，用于ASCII字符数据。
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