From d2ad6751d5c8c8f682aad3a0a4deeb8134c07a8f Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Fri, 1 Sep 2017 20:37:23 -0400
Subject: [PATCH] Clear uninitialized variable warnings under xlC

---
 asn.cpp      |  4 ++--
 cast.cpp     |  2 +-
 sha.cpp      |  5 ++---
 zinflate.cpp | 13 ++++++++-----
 4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/asn.cpp b/asn.cpp
index cd7a9337..fb7740b4 100644
--- a/asn.cpp
+++ b/asn.cpp
@@ -76,7 +76,7 @@ bool BERLengthDecode(BufferedTransformation &bt, lword &length, bool &definiteLe
 bool BERLengthDecode(BufferedTransformation &bt, size_t &length)
 {
 	lword lw = 0;
-	bool definiteLength;
+	bool definiteLength = false;
 	if (!BERLengthDecode(bt, lw, definiteLength))
 		BERDecodeError();
 	if (!SafeConvert(lw, length))
@@ -343,7 +343,7 @@ void EncodedObjectFilter::Put(const byte *inString, size_t length)
 				break;
 			}
 			ByteQueue::Walker walker(m_queue);
-			bool definiteLength;
+			bool definiteLength = false;
 			if (!BERLengthDecode(walker, m_lengthRemaining, definiteLength))
 				return;
 			m_queue.TransferTo(CurrentTarget(), walker.GetCurrentPosition());
diff --git a/cast.cpp b/cast.cpp
index 010fef04..352fcdf8 100644
--- a/cast.cpp
+++ b/cast.cpp
@@ -100,7 +100,7 @@ void CAST128::Base::UncheckedSetKey(const byte *userKey, unsigned int keylength,
 
 	reduced = (keylength <= 10);
 
-	word32 X[4], Z[4];
+	word32 X[4], Z[4]={0};
 	GetUserKey(BIG_ENDIAN_ORDER, X, 4, userKey, keylength);
 
 #define x(i) GETBYTE(X[i/4], 3-i%4)
diff --git a/sha.cpp b/sha.cpp
index 114b1b76..d384b1fd 100644
--- a/sha.cpp
+++ b/sha.cpp
@@ -261,7 +261,7 @@ ANONYMOUS_NAMESPACE_BEGIN
 
 void SHA256_HashBlock_CXX(word32 *state, const word32 *data)
 {
-    word32 W[16], T[8];
+    word32 W[16]={0}, T[8];
     /* Copy context->state[] to working vars */
     memcpy(T, state, sizeof(T));
     /* 64 operations, partially loop unrolled */
@@ -1043,8 +1043,7 @@ void SHA512_HashBlock_CXX(word64 *state, const word64 *data)
     CRYPTOPP_ASSERT(state);
     CRYPTOPP_ASSERT(data);
 
-    word64 W[16];
-    word64 T[8];
+    word64 W[16]={0}, T[8];
     /* Copy context->state[] to working vars */
     memcpy(T, state, sizeof(T));
     /* 80 operations, partially loop unrolled */
diff --git a/zinflate.cpp b/zinflate.cpp
index 7e9de15b..f78d3efd 100644
--- a/zinflate.cpp
+++ b/zinflate.cpp
@@ -377,6 +377,7 @@ void Inflator::DecodeHeader()
 		throw UnexpectedEndErr();
 	m_eof = m_reader.GetBits(1) != 0;
 	m_blockType = (byte)m_reader.GetBits(2);
+
 	switch (m_blockType)
 	{
 	case 0:	// stored
@@ -400,13 +401,13 @@ void Inflator::DecodeHeader()
 		unsigned int hlit = m_reader.GetBits(5);
 		unsigned int hdist = m_reader.GetBits(5);
 		unsigned int hclen = m_reader.GetBits(4);
+		unsigned int i = 0;
 
 		FixedSizeSecBlock<unsigned int, 286+32> codeLengths;
-		unsigned int i;
 		static const unsigned int border[] = {    // Order of the bit length code lengths
 			16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
 		std::fill(codeLengths.begin(), codeLengths+19, 0);
-		for (i=0; i<hclen+4; i++)
+		for (i=0; i<hclen+4; ++i)
 		{
 			CRYPTOPP_ASSERT(border[i] < codeLengths.size());
 			codeLengths[border[i]] = m_reader.GetBits(3);
@@ -414,11 +415,13 @@ void Inflator::DecodeHeader()
 
 		try
 		{
+			bool result = false;
+			unsigned int k=0, count=0, repeater=0;
 			HuffmanDecoder codeLengthDecoder(codeLengths, 19);
-			for (i = 0; i < hlit+257+hdist+1; )
+			for (i=0; i < hlit+257+hdist+1; )
 			{
-				unsigned int k = 0, count = 0, repeater = 0;
-				bool result = codeLengthDecoder.Decode(m_reader, k);
+				k = 0, count = 0, repeater = 0;
+				result = codeLengthDecoder.Decode(m_reader, k);
 				if (!result)
 					throw UnexpectedEndErr();
 				if (k <= 15)