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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
+// http://code.google.com/p/ceres-solver/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * 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.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
+//
+// Author: sameeragarwal@google.com (Sameer Agarwal)
+//
+// Block structure objects are used to carry information about the
+// dense block structure of sparse matrices. The BlockSparseMatrix
+// object uses the BlockStructure objects to keep track of the matrix
+// structure and operate upon it. This allows us to use more cache
+// friendly block oriented linear algebra operations on the matrix
+// instead of accessing it one scalar entry at a time.
+
+#ifndef CERES_INTERNAL_BLOCK_STRUCTURE_H_
+#define CERES_INTERNAL_BLOCK_STRUCTURE_H_
+
+#include <vector>
+#include "ceres/internal/port.h"
+#include "ceres/types.h"
+
+namespace ceres {
+namespace internal {
+
+class BlockStructureProto;
+
+typedef int16 BlockSize;
+
+struct Block {
+  Block() : size(-1), position(-1) {}
+  Block(int size_, int position_) : size(size_), position(position_) {}
+
+  BlockSize size;
+  int position;  // Position along the row/column.
+};
+
+struct Cell {
+  Cell() : block_id(-1), position(-1) {}
+  Cell(int block_id_, int position_)
+      : block_id(block_id_), position(position_) {}
+
+  // Column or row block id as the case maybe.
+  int block_id;
+  // Where in the values array of the jacobian is this cell located.
+  int position;
+};
+
+// Order cell by their block_id;
+bool CellLessThan(const Cell& lhs, const Cell& rhs);
+
+struct CompressedList {
+  Block block;
+  vector<Cell> cells;
+};
+
+typedef CompressedList CompressedRow;
+typedef CompressedList CompressedColumn;
+
+struct CompressedRowBlockStructure {
+  vector<Block> cols;
+  vector<CompressedRow> rows;
+};
+
+struct CompressedColumnBlockStructure {
+  vector<Block> rows;
+  vector<CompressedColumn> cols;
+};
+
+// Deserialize the given block structure proto to the given block structure.
+// Destroys previous contents of block_structure.
+void ProtoToBlockStructure(const BlockStructureProto &proto,
+                           CompressedRowBlockStructure *block_structure);
+
+// Serialize the given block structure to the given proto. Destroys previous
+// contents of proto.
+void BlockStructureToProto(const CompressedRowBlockStructure &block_structure,
+                           BlockStructureProto *proto);
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_BLOCK_STRUCTURE_H_