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127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/*
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* libOPNMIDI is a free MIDI to WAV conversion library with OPN2 (YM2612) emulation
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*
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* MIDI parser and player (Original code from ADLMIDI): Copyright (c) 2010-2014 Joel Yliluoma <bisqwit@iki.fi>
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* ADLMIDI Library API: Copyright (c) 2015-2018 Vitaly Novichkov <admin@wohlnet.ru>
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*
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* Library is based on the ADLMIDI, a MIDI player for Linux and Windows with OPL3 emulation:
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* http://iki.fi/bisqwit/source/adlmidi.html
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPNMIDI_BANKMAP_H
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#define OPNMIDI_BANKMAP_H
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#include <list>
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#include <utility>
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#include <stdint.h>
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#include <stddef.h>
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#include "opnmidi_ptr.hpp"
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/**
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* A simple hash map which accepts bank numbers as keys, can be reserved to a
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* fixed size, offers O(1) search and insertion, has a hash function to
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* optimize for the worst case, and has some good cache locality properties.
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*/
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template <class T>
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class BasicBankMap
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{
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public:
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typedef size_t key_type; /* the bank identifier */
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typedef T mapped_type;
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typedef std::pair<key_type, T> value_type;
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BasicBankMap();
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void reserve(size_t capacity);
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size_t size() const
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{ return m_size; }
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size_t capacity() const
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{ return m_capacity; }
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bool empty() const
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{ return m_size == 0; }
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class iterator;
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iterator begin() const;
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iterator end() const;
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struct do_not_expand_t {};
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iterator find(key_type key);
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void erase(iterator it);
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std::pair<iterator, bool> insert(const value_type &value);
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std::pair<iterator, bool> insert(const value_type &value, do_not_expand_t);
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void clear();
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T &operator[](key_type key);
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private:
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struct Slot;
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enum { minimum_allocation = 4 };
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enum
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{
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hash_bits = 8, /* worst case # of collisions: 128^2/2^hash_bits */
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hash_buckets = 1 << hash_bits,
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};
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public:
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class iterator
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{
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public:
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iterator();
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value_type &operator*() const { return slot->value; }
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value_type *operator->() const { return &slot->value; }
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iterator &operator++();
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bool operator==(const iterator &o) const;
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bool operator!=(const iterator &o) const;
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void to_ptrs(void *ptrs[3]);
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static iterator from_ptrs(void *const ptrs[3]);
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private:
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Slot **buckets;
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Slot *slot;
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size_t index;
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iterator(Slot **buckets, Slot *slot, size_t index);
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#ifdef _MSC_VER
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template<class _T>
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friend class BasicBankMap;
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#else
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friend class BasicBankMap<T>;
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#endif
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};
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private:
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struct Slot {
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Slot *next, *prev;
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value_type value;
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Slot() : next(NULL), prev(NULL) {}
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};
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AdlMIDI_SPtrArray<Slot *> m_buckets;
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std::list< AdlMIDI_SPtrArray<Slot> > m_allocations;
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Slot *m_freeslots;
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size_t m_size;
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size_t m_capacity;
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static size_t hash(key_type key);
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Slot *allocate_slot();
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Slot *ensure_allocate_slot();
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void free_slot(Slot *slot);
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Slot *bucket_find(size_t index, key_type key);
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void bucket_add(size_t index, Slot *slot);
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void bucket_remove(size_t index, Slot *slot);
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};
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#include "opnmidi_bankmap.tcc"
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#endif // OPNMIDI_BANKMAP_H
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