[ft] Disallow getting the entire font data with tag=0
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@ -152,6 +152,9 @@ _get_table (hb_tag_t tag, void *user_data)
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FT_ULong length = 0;
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FT_Error error;
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if (HB_UNLIKELY (tag == HB_TAG_NONE))
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return hb_blob_create_empty ();
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error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
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if (error)
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return hb_blob_create_empty ();
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