[3.12] Fix the long64 reader in umarshal.py (GH-107828) (#107849)

Fix the long64 reader in umarshal.py (GH-107828)
(cherry picked from commit 50bbc56009ae7303d2482f28eb62f2603664b58f)

Co-authored-by: Martin DeMello <martindemello@gmail.com>

diff --git a/Tools/build/umarshal.py b/Tools/build/umarshal.py
index f61570cbaff751144c7be789774401c8d92ef3a5..e05d93cf23c921bea1157904deebefbf61e7a164 100644 (file)
--- a/Tools/build/umarshal.py
+++ b/Tools/build/umarshal.py
@@ -125,10 +125,10 @@ class Reader:
         x |= buf[1] << 8
         x |= buf[2] << 16
         x |= buf[3] << 24
-        x |= buf[1] << 32
-        x |= buf[1] << 40
-        x |= buf[1] << 48
-        x |= buf[1] << 56
+        x |= buf[4] << 32
+        x |= buf[5] << 40
+        x |= buf[6] << 48
+        x |= buf[7] << 56
         x |= -(x & (1<<63))  # Sign-extend
         return x