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+/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* ====================================================================
+ * Copyright (c) 1999-2007 Carnegie Mellon University.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * This work was supported in part by funding from the Defense Advanced 
+ * Research Projects Agency and the National Science Foundation of the 
+ * United States of America, and the CMU Sphinx Speech Consortium.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
+ * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
+ * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ====================================================================
+ *
+ */
+/*
+ * \file ngram_model_dmp.h DMP format for N-Gram models
+ *
+ * Author: David Huggins-Daines <dhuggins@cs.cmu.edu>
+ */
+
+#ifndef __NGRAM_MODEL_DMP_H__
+#define __NGRAM_MODEL_DMP_H__
+
+#include "sphinxbase/mmio.h"
+
+#include "ngram_model_internal.h"
+#include "lm3g_model.h"
+
+/**
+ * On-disk representation of bigrams.
+ */
+struct bigram_s {
+    uint16 wid;	/**< Index of unigram entry for this.  (NOT dictionary id.) */
+    uint16 prob2;	/**< Index into array of actual bigram probs */
+    uint16 bo_wt2;	/**< Index into array of actual bigram backoff wts */
+    uint16 trigrams;	/**< Index of 1st entry in lm_t.trigrams[],
+			   RELATIVE TO its segment base (see lm3g_model.h) */
+};
+
+/**
+ * On-disk representation of trigrams.
+ *
+ * As with bigrams, trigram prob info kept in a separate table for conserving
+ * memory space.
+ */
+struct trigram_s {
+    uint16 wid;	  /**< Index of unigram entry for this.  (NOT dictionary id.) */
+    uint16 prob3; /**< Index into array of actual trigram probs */
+};
+
+/**
+ * Subclass of ngram_model for DMP file reading.
+ */
+typedef struct ngram_model_dmp_s {
+    ngram_model_t base;  /**< Base ngram_model_t structure */
+    lm3g_model_t lm3g;   /**< Common lm3g_model_t structure */
+    mmio_file_t *dump_mmap; /**< mmap() of dump file (or NULL if none) */
+} ngram_model_dmp_t;
+
+/**
+ * Construct a DMP format model from a generic base model.
+ *
+ * Note: If base is already a DMP format model, this just calls
+ * ngram_model_retain(), and any changes will also be made in the base
+ * model.
+ */
+ngram_model_dmp_t *ngram_model_dmp_build(ngram_model_t *base);
+
+
+#endif /*  __NGRAM_MODEL_DMP_H__ */