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diff --git a/jdmarker.c b/jdmarker.c
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index 7b4c12d..381835b 100644
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--- a/jdmarker.c
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+++ b/jdmarker.c
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@@ -471,6 +471,7 @@ get_dht (j_decompress_ptr cinfo)
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     for (i = 0; i < count; i++)
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       INPUT_BYTE(cinfo, huffval[i], return FALSE);
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+    MEMZERO(&huffval[count], (256 - count) * SIZEOF(UINT8));
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     length -= count;
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     if (index & 0x10) {		/* AC table definition */