文件名称:base64
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Base64是MIME邮件中常用的编码方式之一。它的主要思想是将输入的字符串或数据编码成只含有{ A - Z , a - z , 0 - 9 , + , / }这64个可打印字符的串，故称为“Base64”。
Base64编码的方法是，将输入数据流每次取6 bit，用此6 bit的值(0-63)作为索引去查表，输出相应字符。这样，每3个字节将编码为4个字符(3×8 → 4×6)；不满4个字符的以 = 填充。 -Base64 is a MIME message encoding one of the ways commonly used. Its main idea is to input data encoded into a string or contains only (A- Z, a- z, 0- 9,+, /) This 64 string of printable characters, so called Base64 . Base64 encoding method is the input data stream from each 6 bit, with this 6 bit value (0-63) as the index to look-up table, output the corresponding character. In this way, each 3-byte encoding for the four characters (3 × 8 → 4 × 6) dissatisfied with 4 characters to = fill.
Base64编码的方法是，将输入数据流每次取6 bit，用此6 bit的值(0-63)作为索引去查表，输出相应字符。这样，每3个字节将编码为4个字符(3×8 → 4×6)；不满4个字符的以 = 填充。 -Base64 is a MIME message encoding one of the ways commonly used. Its main idea is to input data encoded into a string or contains only (A- Z, a- z, 0- 9,+, /) This 64 string of printable characters, so called Base64 . Base64 encoding method is the input data stream from each 6 bit, with this 6 bit value (0-63) as the index to look-up table, output the corresponding character. In this way, each 3-byte encoding for the four characters (3 × 8 → 4 × 6) dissatisfied with 4 characters to = fill.
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base64.txt