97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
/******************************************************************************/
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/* Mednafen - Multi-system Emulator */
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/******************************************************************************/
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/* MemoryStream.h:
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** Copyright (C) 2012-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) 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, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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Notes:
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For performance reasons(like in the state rewinding code), we should try to make sure map()
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returns a pointer that is aligned to at least what malloc()/realloc() provides.
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(And maybe forcefully align it to at least 16 bytes in the future)
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*/
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#ifndef __MDFN_MEMORYSTREAM_H
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#define __MDFN_MEMORYSTREAM_H
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#include "Stream.h"
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class MemoryStream : public Stream
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{
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public:
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MemoryStream();
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MemoryStream(uint64 alloc_hint, int alloc_hint_is_size = false); // Pass -1 instead of 1 for alloc_hint_is_size to skip initialization of the memory.
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MemoryStream(Stream *stream, uint64 size_limit = ~(uint64)0);
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// Will create a MemoryStream equivalent of the contents of "stream", and then "delete stream".
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// Will only work if stream->tell() == 0, or if "stream" is seekable.
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// stream will be deleted even if this constructor throws.
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//
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// Will throw an exception if the initial size() of the MemoryStream would be greater than size_limit(useful for when passing
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// in GZFileStream streams).
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MemoryStream(const MemoryStream &zs);
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MemoryStream & operator=(const MemoryStream &zs);
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virtual ~MemoryStream() override;
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virtual uint64 attributes(void) override;
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virtual uint8 *map(void) noexcept override;
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virtual uint64 map_size(void) noexcept override;
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virtual void unmap(void) noexcept override;
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virtual uint64 read(void *data, uint64 count, bool error_on_eos = true) override;
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virtual void write(const void *data, uint64 count) override;
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virtual void truncate(uint64 length) override;
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virtual void seek(int64 offset, int whence) override;
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virtual uint64 tell(void) override;
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virtual uint64 size(void) override;
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virtual void flush(void) override;
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virtual void close(void) override;
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virtual int get_line(std::string &str) override;
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void shrink_to_fit(void) noexcept; // Minimizes alloced memory.
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#if 0
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// No methods on the object may be called externally(other than the destructor) after steal_malloced_ptr()
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INLINE void* steal_malloced_ptr(void)
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{
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void* ret = data_buffer;
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data_buffer = nullptr;
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data_buffer_size = 0;
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data_buffer_alloced = 0;
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position = 0;
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return ret;
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}
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#endif
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private:
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uint8 *data_buffer;
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uint64 data_buffer_size;
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uint64 data_buffer_alloced;
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uint64 position;
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void grow_if_necessary(uint64 new_required_size, uint64 hole_end);
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};
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#endif
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