From f52354a88927eb66bcb1f603d2d91162b5bd2b5f Mon Sep 17 00:00:00 2001
From: Yen Chi Hsuan <yan12125@gmail.com>
Date: Fri, 26 Feb 2016 14:58:29 +0800
Subject: [utils] Move codes for handling eval() from iqiyi.py

---
 youtube_dl/utils.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'youtube_dl/utils.py')

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 900e07a8e..fc7e2fb7f 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2635,3 +2635,23 @@ def base_n(num, n, table=None):
         ret = table[num % n] + ret
         num = num // n
     return ret
+
+
+def decode_packed_codes(code):
+    mobj = re.search(
+        r"'([^']+)',(\d+),(\d+),'([^']+)'\.split\('\|'\),[^,]+,{}",
+        code)
+    obfucasted_code, base, count, symbols = mobj.groups()
+    base = int(base)
+    count = int(count)
+    symbols = symbols.split('|')
+    symbol_table = {}
+
+    while count:
+        count -= 1
+        base_n_count = base_n(count, base)
+        symbol_table[base_n_count] = symbols[count] or base_n_count
+
+    return re.sub(
+        r'\b(\w+)\b', lambda mobj: symbol_table[mobj.group(0)],
+        obfucasted_code)
-- 
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