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d1624a5521
* Add zstd support. * Rearrange serialization order * Compress entire mapblock Co-authored-by: sfan5 <sfan5@live.de>
102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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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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#pragma once
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#include "irrlichttypes.h"
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#include "exceptions.h"
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#include <iostream>
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#include "util/pointer.h"
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/*
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Map format serialization version
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--------------------------------
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For map data (blocks, nodes, sectors).
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NOTE: The goal is to increment this so that saved maps will be
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loadable by any version. Other compatibility is not
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maintained.
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0: original networked test with 1-byte nodes
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1: update with 2-byte nodes
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2: lighting is transmitted in param
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3: optional fetching of far blocks
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4: block compression
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5: sector objects NOTE: block compression was left accidentally out
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6: failed attempt at switching block compression on again
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7: block compression switched on again
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8: server-initiated block transfers and all kinds of stuff
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9: block objects
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10: water pressure
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11: zlib'd blocks, block flags
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12: UnlimitedHeightmap now uses interpolated areas
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13: Mapgen v2
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14: NodeMetadata
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15: StaticObjects
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16: larger maximum size of node metadata, and compression
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17: MapBlocks contain timestamp
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18: new generator (not really necessary, but it's there)
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19: new content type handling
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20: many existing content types translated to extended ones
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21: dynamic content type allocation
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22: minerals removed, facedir & wallmounted changed
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23: new node metadata format
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24: 16-bit node ids and node timers (never released as stable)
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25: Improved node timer format
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26: Never written; read the same as 25
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27: Added light spreading flags to blocks
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28: Added "private" flag to NodeMetadata
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29: Switched compression to zstd, a bit of reorganization
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*/
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// This represents an uninitialized or invalid format
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#define SER_FMT_VER_INVALID 255
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// Highest supported serialization version
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#define SER_FMT_VER_HIGHEST_READ 29
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// Saved on disk version
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#define SER_FMT_VER_HIGHEST_WRITE 29
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// Lowest supported serialization version
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#define SER_FMT_VER_LOWEST_READ 0
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// Lowest serialization version for writing
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// Can't do < 24 anymore; we have 16-bit dynamically allocated node IDs
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// in memory; conversion just won't work in this direction.
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#define SER_FMT_VER_LOWEST_WRITE 24
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inline bool ser_ver_supported(s32 v) {
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return v >= SER_FMT_VER_LOWEST_READ && v <= SER_FMT_VER_HIGHEST_READ;
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}
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/*
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Misc. serialization functions
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*/
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void compressZlib(const u8 *data, size_t data_size, std::ostream &os, int level = -1);
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void compressZlib(const std::string &data, std::ostream &os, int level = -1);
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void decompressZlib(std::istream &is, std::ostream &os, size_t limit = 0);
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void compressZstd(const u8 *data, size_t data_size, std::ostream &os, int level = 0);
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void compressZstd(const std::string &data, std::ostream &os, int level = 0);
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void decompressZstd(std::istream &is, std::ostream &os);
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// These choose between zlib and a self-made one according to version
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void compress(const SharedBuffer<u8> &data, std::ostream &os, u8 version, int level = -1);
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void compress(const std::string &data, std::ostream &os, u8 version, int level = -1);
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void compress(u8 *data, u32 size, std::ostream &os, u8 version, int level = -1);
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void decompress(std::istream &is, std::ostream &os, u8 version);
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