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+/*
+ * Copyright (c) 2011, Andrea Mazzoleni. 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 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.
+ */
+
+/** \file
+ * Dynamic array based on segments of exponential growing size.
+ *
+ * This array is able to grow dynamically upon request, without any reallocation.
+ *
+ * The grow operation involves an allocation of a new array segment, without reallocating
+ * the already used memory, and then not increasing the heap fragmentation.
+ * This also implies that the address of the stored elements never change.
+ *
+ * Allocated segments grow in size exponentially.
+ */
+
+#ifndef __TOMMYARRAY_H
+#define __TOMMYARRAY_H
+
+#include "tommytypes.h"
+
+#include <assert.h> /* for assert */
+
+/******************************************************************************/
+/* array */
+
+/**
+ * Initial and minimal size of the array expressed as a power of 2.
+ * The initial size is 2^TOMMY_ARRAY_BIT.
+ */
+#define TOMMY_ARRAY_BIT 6
+
+/** \internal
+ * Max number of elements as a power of 2.
+ */
+#define TOMMY_ARRAY_BIT_MAX 32
+
+/**
+ * Array container type.
+ * \note Don't use internal fields directly, but access the container only using functions.
+ */
+typedef struct tommy_array_struct {
+ void** bucket[TOMMY_ARRAY_BIT_MAX]; /**< Dynamic array of buckets. */
+ tommy_uint_t bucket_bit; /**< Bits used in the bit mask. */
+ tommy_count_t bucket_max; /**< Number of buckets. */
+ tommy_count_t count; /**< Number of initialized elements in the array. */
+} tommy_array;
+
+/**
+ * Initializes the array.
+ */
+void tommy_array_init(tommy_array* array);
+
+/**
+ * Deinitializes the array.
+ */
+void tommy_array_done(tommy_array* array);
+
+/**
+ * Grows the size up to the specified value.
+ * All the new elements in the array are initialized with the 0 value.
+ */
+void tommy_array_grow(tommy_array* array, tommy_count_t size);
+
+/**
+ * Gets a reference of the element at the specified position.
+ * You must be sure that space for this position is already
+ * allocated calling tommy_array_grow().
+ */
+tommy_inline void** tommy_array_ref(tommy_array* array, tommy_count_t pos)
+{
+ tommy_uint_t bsr;
+
+ assert(pos < array->count);
+
+ /* get the highest bit set, in case of all 0, return 0 */
+ bsr = tommy_ilog2_u32(pos | 1);
+
+ return &array->bucket[bsr][pos];
+}
+
+/**
+ * Sets the element at the specified position.
+ * You must be sure that space for this position is already
+ * allocated calling tommy_array_grow().
+ */
+tommy_inline void tommy_array_set(tommy_array* array, tommy_count_t pos, void* element)
+{
+ *tommy_array_ref(array, pos) = element;
+}
+
+/**
+ * Gets the element at the specified position.
+ * You must be sure that space for this position is already
+ * allocated calling tommy_array_grow().
+ */
+tommy_inline void* tommy_array_get(tommy_array* array, tommy_count_t pos)
+{
+ return *tommy_array_ref(array, pos);
+}
+
+/**
+ * Grows and inserts a new element at the end of the array.
+ */
+tommy_inline void tommy_array_insert(tommy_array* array, void* element)
+{
+ tommy_count_t pos = array->count;
+
+ tommy_array_grow(array, pos + 1);
+
+ tommy_array_set(array, pos, element);
+}
+
+/**
+ * Gets the initialized size of the array.
+ */
+tommy_inline tommy_count_t tommy_array_size(tommy_array* array)
+{
+ return array->count;
+}
+
+/**
+ * Gets the size of allocated memory.
+ */
+tommy_size_t tommy_array_memory_usage(tommy_array* array);
+
+#endif
+