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Timothy B. Terriberry authored
A common application pattern is to call vorbis_synthesis_headerin() and count how many times it succeeds. If you feed it multiple valid comment headers, they will all succeed, meaning you can be fooled into think you have a valid Vorbis file despite never seeing a setup header. This patch makes libvorbis reject multiple headers of the same type, preventing this from occurring. svn path=/trunk/vorbis/; revision=19426
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