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-rw-r--r--youtube_dl/utils.py13
1 files changed, 13 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 0d30075aa..b14603d8a 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -5383,6 +5383,19 @@ def decode_packed_codes(code):
obfucasted_code)
+def caesar(s, alphabet, shift):
+ if shift == 0:
+ return s
+ l = len(alphabet)
+ return ''.join(
+ alphabet[(alphabet.index(c) + shift) % l] if c in alphabet else c
+ for c in s)
+
+
+def rot47(s):
+ return caesar(s, r'''!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~''', 47)
+
+
def parse_m3u8_attributes(attrib):
info = {}
for (key, val) in re.findall(r'(?P<key>[A-Z0-9-]+)=(?P<val>"[^"]+"|[^",]+)(?:,|$)', attrib):