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+# [[2016-08-16] Challenge #279 [Easy] Uuencoding](https://www.reddit.com/r/dailyprogrammer/comments/4xy6i1/20160816_challenge_279_easy_uuencoding/)
+
+You are trapped at uninhabited island only with your laptop. Still you don't
+want your significant other to worry about you, so you are going to send a
+message in a bottle with your picture or at least a couple of words from you
+(sure, you could just write down the words, but that would be less fun). You're
+going to use uuencoding for that.
+
+Uuencoding is a form of binary-to-text encoding, which uses only symbols from
+32-95 diapason, which means all symbols used in the encoding are printable.
+
+## Description of encoding
+
+A uuencoded file starts with a header line of the form:
+
+    begin <mode> <file><newline>
+
+<mode> is the file's Unix file permissions as three octal digits (e.g. 644,
+744). For Windows 644 is always used.
+
+<file> is the file name to be used when recreating the binary data.
+
+<newline> signifies a newline character, used to terminate each line.
+
+Each data line uses the format:
+
+    <length character><formatted characters><newline>
+
+<length character> is a character indicating the number of data bytes which
+have been encoded on that line. This is an ASCII character determined by adding
+32 to the actual byte count, with the sole exception of a grave accent "`"
+(ASCII code 96) signifying zero bytes. All data lines except the last (if the
+data was not divisible by 45), have 45 bytes of encoded data (60 characters
+after encoding). Therefore, the vast majority of length values is 'M', (32 + 45
+= ASCII code 77 or "M").
+
+<formatted characters> are encoded characters.
+
+The mechanism of uuencoding repeats the following for every 3 bytes (if there
+are less than 3 bytes left, trailing 0 are added):
+
+1. Start with 3 bytes from the source, 24 bits in total.
+2. Split into 4 6-bit groupings, each representing a value in the range 0 to
+   63: bits (00-05), (06-11), (12-17) and (18-23).
+3. Add 32 to each of the values. With the addition of 32 this means that the
+   possible results can be between 32 (" " space) and 95 ("_" underline). 96
+   ("`" grave accent) as the "special character" is a logical extension of this
+   range.
+4. Output the ASCII equivalent of these numbers.
+
+For example, we want to encode a word "Cat". ASCII values for C,a,t are
+67,97,116, or  `010000110110000101110100` in binary. After dividing into four
+groups, we get 010000 110110 000101 110100, which is 16,54,5,52 in decimal.
+Adding 32 to this values and encoding back in ASCII, the final result is
+`0V%T`.
+
+The file ends with two lines:
+
+    `<newline>
+    end<newline>
+
+## Formal Inputs & Outputs
+
+### Input
+
+a byte array or string.
+
+### Output
+
+a string containing uuencoded input.
+
+## Examples
+
+Input: Cat
+
+Output:
+ 
+    begin 644 cat.txt
+    #0V%T
+    `
+    end
+
+Input:
+
+I feel very strongly about you doing duty. Would you give me a little more
+documentation about your reading in French? I am glad you are happy — but I
+never believe much in happiness. I never believe in misery either. Those are
+things you see on the stage or the screen or the printed pages, they never
+really happen to you in life.
+
+Output:
+
+    begin 644 file.txt
+    M22!F965L('9E<GD@<W1R;VYG;'D@86)O=70@>6]U(&1O:6YG(&1U='DN(%=O
+    M=6QD('EO=2!G:79E(&UE(&$@;&ET=&QE(&UO<F4@9&]C=6UE;G1A=&EO;B!A
+    M8F]U="!Y;W5R(')E861I;F<@:6X@1G)E;F-H/R!)(&%M(&=L860@>6]U(&%R
+    M92!H87!P>2#B@)0@8G5T($D@;F5V97(@8F5L:65V92!M=6-H(&EN(&AA<'!I
+    M;F5S<RX@22!N979E<B!B96QI979E(&EN(&UI<V5R>2!E:71H97(N(%1H;W-E
+    M(&%R92!T:&EN9W,@>6]U('-E92!O;B!T:&4@<W1A9V4@;W(@=&AE('-C<F5E
+    M;B!O<B!T:&4@<')I;G1E9"!P86=E<RP@=&AE>2!N979E<B!R96%L;'D@:&%P
+    3<&5N('1O('EO=2!I;B!L:69E+C P
+    `
+    end
+
+## Bonuses
+
+### Bonus 1
+
+Write uudecoder, which decodes uuencoded input back to a byte array or string
+
+### Bonus 2
+
+Write encoder for files as well.
+
+### Bonus 3
+
+Make encoding parallel.
+
+## Further Reading
+
+[Binary-to-text encoding](https://en.wikipedia.org/wiki/Binary-to-text_encoding)
+on Wikipedia.
+
+##Finally
+
+This challenge is posted by /u/EvgeniyZh
+
+Also have a good challenge idea?
+
+Consider submitting it to /r/dailyprogrammer_ideas