X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=youtube_dl%2Futils.py;h=606977c5874ac613f0224815e8c91fc5ef62400a;hb=5e73a67d44bc25bd8660704cd437d35bd1e9541e;hp=be1f3b0d77a55a3245b5cff44982256e072d6c0e;hpb=481888294d19ef52075e531ce26588d97b3d16d2;p=youtube-dl

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index be1f3b0d7..606977c58 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2621,9 +2621,17 @@ def ohdave_rsa_encrypt(data, exponent, modulus):
     return '%x' % encrypted
 
 
-def base_n(num, n, table):
+def encode_base_n(num, n, table=None):
+    FULL_TABLE = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+    if not table:
+        table = FULL_TABLE[:n]
+
+    if n > len(table):
+        raise ValueError('base %d exceeds table length %d' % (n, len(table)))
+
     if num == 0:
-        return '0'
+        return table[0]
+
     ret = ''
     while num:
         ret = table[num % n] + ret
@@ -2631,9 +2639,21 @@ def base_n(num, n, table):
     return ret
 
 
-def base36(num):
-    return base_n(num, 36, '0123456789abcdefghijklmnopqrstuvwxyz')
+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 = encode_base_n(count, base)
+        symbol_table[base_n_count] = symbols[count] or base_n_count
 
-def base62(num):
-    return base_n(num, 62, '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
+    return re.sub(
+        r'\b(\w+)\b', lambda mobj: symbol_table[mobj.group(0)],
+        obfucasted_code)