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From b62c902dd258125cac86cd2df21fc898035a43d3 Mon Sep 17 00:00:00 2001
From: Michael Pruett <michael@68k.org>
Date: Mon, 29 Aug 2016 23:08:26 -0500
Subject: [PATCH] Fix undefined behavior in sign conversion.
Origin: https://github.com/mpruett/audiofile/commit/b62c902dd258125cac86cd2df21fc898035a43d3
---
diff --git a/libaudiofile/modules/SimpleModule.h b/libaudiofile/modules/SimpleModule.h
index 03c6c69..bad85ad 100644
--- a/libaudiofile/modules/SimpleModule.h
+++ b/libaudiofile/modules/SimpleModule.h
@@ -123,7 +123,8 @@ struct signConverter
typedef typename IntTypes<Format>::UnsignedType UnsignedType;
static const int kScaleBits = (Format + 1) * CHAR_BIT - 1;
- static const int kMinSignedValue = -1 << kScaleBits;
+ static const int kMaxSignedValue = (((1 << (kScaleBits - 1)) - 1) << 1) + 1;
+ static const int kMinSignedValue = -kMaxSignedValue - 1;
struct signedToUnsigned : public std::unary_function<SignedType, UnsignedType>
{
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