base 64

(file format, algorithm)A file format using 64 ASCIIcharacters to encode the six bit binary data values 0-63.

To convert data to base 64, the first byte is placed in themost significant eight bits of a 24-bit buffer, the next inthe middle eight, and the third in the least significant eightbits. If there a fewer than three bytes to encode, thecorresponding buffer bits will be zero. The buffer is thenused, six bits at a time, most significant first, as indicesinto the string"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"and the indicated character output. If there were only one ortwo input bytes, the output is padded with two or one "="characters respectively. This prevents extra bits being addedto the reconstructed data. The process then repeats on theremaining input data.

Base 64 is used when transmitting binary data throughtext-only media such as electronic mail, and has largelyreplaced the older uuencode encoding.

单词	base 64
释义	base 64 base 64 (file format, algorithm)A file format using 64 ASCIIcharacters to encode the six bit binary data values 0-63. To convert data to base 64, the first byte is placed in themost significant eight bits of a 24-bit buffer, the next inthe middle eight, and the third in the least significant eightbits. If there a fewer than three bytes to encode, thecorresponding buffer bits will be zero. The buffer is thenused, six bits at a time, most significant first, as indicesinto the string"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"and the indicated character output. If there were only one ortwo input bytes, the output is padded with two or one "="characters respectively. This prevents extra bits being addedto the reconstructed data. The process then repeats on theremaining input data. Base 64 is used when transmitting binary data throughtext-only media such as electronic mail, and has largelyreplaced the older uuencode encoding.
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