78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
/* Mednafen - Multi-system Emulator
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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 2 of the License, or
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* (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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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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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