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| -rw-r--r-- | base64.joy | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/base64.joy b/base64.joy new file mode 100644 index 0000000..0aa97b4 --- /dev/null +++ b/base64.joy @@ -0,0 +1,29 @@ +DEFINE +shl == 2 *; +shr == 2 /; +and63 == [64 / 64 *] nullary -; +b64enc1 == ord 16 [shl] times [ord 8 [shl] times] dip + [ord] dip +; +b64enc2 == "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" swap [] [ + [18 [shr] times and63 at] + [12 [shr] times and63 at] + [6 [shr] times and63 at] + [and63 at] + ] construct "" cons cons cons cons [pop] dip; + +s2l == [null] [pop []] [uncons] [cons] linrec; +b64enc == + s2l + "" swap + # pad with null bytes + # calculate how many bytes to pad + [size 3 rem 3 swap - 3 rem] nullary + # i cant use null bytes in strings (hence s2l) + [0 chr [] cons concat] times + # len(s)/3 times + [size 3 /] nullary + [[3 take] nullary s2l [b64enc1 b64enc2] infra first rollup [swap concat] dip 3 drop] times + # remove the now-empty string + pop + "\n" concat +END +stdin [feof not] [fgets b64enc putchars] while fclose. |