From cbc6eabb9fae8e61c6c6f70365ec9134b481e7aa Mon Sep 17 00:00:00 2001
From: Uoti Urpala <uau@glyph.nonexistent.invalid>
Date: Thu, 11 Mar 2010 23:42:20 +0200
Subject: TOOLS/matroska.py: support 8-byte floats in parsing mode

Support parsing and printing the value of 8-byte floats when using the
script to parse and display contents of Matroska files.
---
 TOOLS/matroska.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'TOOLS')

diff --git a/TOOLS/matroska.py b/TOOLS/matroska.py
index 8368f35185..77268c8183 100755
--- a/TOOLS/matroska.py
+++ b/TOOLS/matroska.py
@@ -332,8 +332,13 @@ def read_float(s, length):
         f = ldexp((i & 0x7fffff) + (1 << 23), (i >> 23 & 0xff) - 150)
         if i & (1 << 31):
             f = -f
-        return f
-    raise SyntaxError
+    elif length == 8:
+        f = ldexp((i & ((1 << 52) - 1)) + (1 << 52), (i >> 52 & 0x7ff) - 1075)
+        if i & (1 << 63):
+            f = -f
+    else:
+        raise SyntaxError
+    return f
 
 def parse_one(s, depth, parent, maxlen):
     elid = read_id(s).encode('hex')
-- 
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