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diff -Nur audiofile-0.3.6/libaudiofile/modules/IMA.cpp audiofile-0.3.6-pull43/libaudiofile/modules/IMA.cpp
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--- audiofile-0.3.6/libaudiofile/modules/IMA.cpp	2013-03-06 06:30:03.000000000 +0100
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+++ audiofile-0.3.6-pull43/libaudiofile/modules/IMA.cpp	2017-03-06 18:06:35.000000000 +0100
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@@ -169,7 +169,7 @@
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 		if (encoded[1] & 0x80)
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 			m_adpcmState[c].previousValue -= 0x10000;
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-		m_adpcmState[c].index = encoded[2];
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+		m_adpcmState[c].index = clamp(encoded[2], 0, 88);
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 		*decoded++ = m_adpcmState[c].previousValue;
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@@ -210,7 +210,7 @@
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 			predictor -= 0x10000;
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 		state.previousValue = clamp(predictor, MIN_INT16, MAX_INT16);
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-		state.index = encoded[1] & 0x7f;
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+		state.index = clamp(encoded[1] & 0x7f, 0, 88);
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 		encoded += 2;
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 		for (int n=0; n