diff options
Diffstat (limited to 'lib/base64.nom')
| -rw-r--r-- | lib/base64.nom | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/lib/base64.nom b/lib/base64.nom index 2091615..01d4f2f 100644 --- a/lib/base64.nom +++ b/lib/base64.nom @@ -1,18 +1,18 @@ -#!/usr/bin/env nomsu -V4.8.10 +#!/usr/bin/env nomsu -V4.10.12.7 # This file defines actions for encoding/decoding base 64, as specified in: https://tools.ietf.org/html/rfc4648 - + %b64_str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" -%reverse_b64 = (%b64_str.%i = (%i - 1) for %i in 1 to (size of %b64_str)) +%reverse_b64 = {: for %i in 1 to (size of %b64_str): add %b64_str.%i = (%i - 1)} %reverse_b64."=" = 0 - test: %cases = ["", "Zg==", "Zm8=", "Zm9v", "Zm9vYg==", "Zm9vYmE=", "Zm9vYmFy"] for %len = %encoded in %cases: %plain = "foobar".[1, %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: @@ -33,18 +33,16 @@ externally [base64 %str, base64 encode %str, %str base64] all mean: %chars::add %b64_str.(((%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 = (%reverse_b64.(%str.%) for % in %i to (%i + 3)) + %indices = [: for % in %i to (%i + 3): add %reverse_b64.(%str.%)] %chars::add (chr ((%indices.1 << 2) + ((%indices.2 & 48) >> 4))) if (%str.(%i + 2) == "="): stop %chars::add (chr (((%indices.2 & 15) << 4) + ((%indices.3 & 60) >> 2))) if (%str.(%i + 3) == "="): stop %chars::add (chr (((%indices.3 & 3) << 6) + %indices.4)) - return (%chars::joined) |