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authorBruce Hill <bruce@bruce-hill.com>2019-01-14 15:42:48 -0800
committerBruce Hill <bruce@bruce-hill.com>2019-01-14 15:43:24 -0800
commitc1c32688a4afc43f6addb99b8b5fa878944a70e3 (patch)
treec886f21b5b08a9053aa74fcba4b241dae5ede76d /lib/base64.nom
parent2309b696fc34b24f05f6658b94f9105ca8ee76e4 (diff)
Overhaul in progress, mostly working. Moved all the nomsu packages into
lib/, including core/*. Changes to how nomsu environments and importing work.
Diffstat (limited to 'lib/base64.nom')
-rw-r--r--lib/base64.nom50
1 files changed, 0 insertions, 50 deletions
diff --git a/lib/base64.nom b/lib/base64.nom
deleted file mode 100644
index 54f785f..0000000
--- a/lib/base64.nom
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/usr/bin/env nomsu -V6.14
-#
- This file defines actions for encoding/decoding base 64, as specified in:
- https://tools.ietf.org/html/rfc4648
-
-$b64_str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
-$b64_chars = [: for $ in 1 to (size of $b64_str): add ($b64_str, character $)]
-$reverse_b64 = {: for $c in $b64_chars at $i: add $c = ($i - 1)}
-$reverse_b64."=" = 64
-set $reverse_b64's metatable to {.__index = (-> 0)}
-test:
- $cases = ["", "Zg==", "Zm8=", "Zm9v", "Zm9vYg==", "Zm9vYmE=", "Zm9vYmFy"]
- for $len = $encoded in $cases:
- $plain = ("foobar", from 1 to ($len - 1))
- assume (base64 $plain) == $encoded
- assume (base64 decode $encoded) == $plain
-
-externally [base64 $str, base64 encode $str, $str base64] all mean:
- $chars = []
- for $i in 1 to (size of $str) via 3:
- $bytes = [=lua "\$str:byte(\$i, \($i + 2))"]
- $chars, add $b64_chars.((($bytes.1 & 252) >> 2) + 1)
- if (size of $bytes) is:
- 3:
- $chars, add $b64_chars.((($bytes.1 & 3) << 4) + (($bytes.2 & 240) >> 4) + 1)
- $chars, add $b64_chars.((($bytes.2 & 15) << 2) + (($bytes.3 & 192) >> 6) + 1)
- $chars, add $b64_chars.(($bytes.3 & 63) + 1)
-
- 2:
- $chars, add $b64_chars.((($bytes.1 & 3) << 4) + (($bytes.2 & 240) >> 4) + 1)
- $chars, add $b64_chars.((($bytes.2 & 15) << 2) + 1)
- $chars, add "="
-
- 1:
- $chars, add $b64_chars.((($bytes.1 & 3) << 4) + 1)
- $chars, add "="
- $chars, add "="
- return ($chars, joined)
-
-externally (chr $) means (=lua "string.char(\$)")
-externally [decode base64 $str, $str base64 decoded, base64 decode $str] all mean:
- $chars = []
- for $i in 1 to (size of $str) via 4:
- $indices = [: for $j in $i to ($i + 3): add $reverse_b64.($str, character $j)]
- $chars, add (chr (($indices.1 << 2) + (($indices.2 & 48) >> 4)))
- if (($str, character ($i + 2)) == "="): stop
- $chars, add (chr ((($indices.2 & 15) << 4) + (($indices.3 & 60) >> 2)))
- if (($str, character ($i + 3)) == "="): stop
- $chars, add (chr ((($indices.3 & 3) << 6) + $indices.4))
- return ($chars, joined)