mirror of
https://github.com/vcmi/vcmi.git
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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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* CLoadFile.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "CLoadFile.h"
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VCMI_LIB_NAMESPACE_BEGIN
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template <typename From, typename To>
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struct static_caster
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{
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To operator()(From p) {return static_cast<To>(p);}
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};
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CLoadFile::CLoadFile(const boost::filesystem::path & fname, IGameCallback * cb)
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: serializer(this)
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, sfile(fname.c_str(), std::ios::in | std::ios::binary)
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{
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serializer.cb = cb;
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serializer.loadingGamestate = true;
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assert(!serializer.reverseEndianness);
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sfile.exceptions(std::ifstream::failbit | std::ifstream::badbit); //we throw a lot anyway
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if(!sfile)
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throw std::runtime_error("Error: cannot open file '" + fname.string() + "' for reading!");
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static const std::string MAGIC = "VCMI";
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std::string readMagic = MAGIC;
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sfile.read(readMagic.data(), 4);
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if(readMagic != MAGIC)
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throw std::runtime_error("Error: '" + fname.string() + "' is not a VCMI file!");
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sfile.read(reinterpret_cast<char*>(&serializer.version), sizeof(serializer.version));
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if(serializer.version < ESerializationVersion::MINIMAL)
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throw std::runtime_error("Error: too old file format detected in '" + fname.string() + "'!");
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if(serializer.version > ESerializationVersion::CURRENT)
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{
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logGlobal->warn("Warning format version mismatch: found %d when current is %d! (file %s)\n", vstd::to_underlying(serializer.version), vstd::to_underlying(ESerializationVersion::CURRENT), fname.string());
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auto * versionptr = reinterpret_cast<char *>(&serializer.version);
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std::reverse(versionptr, versionptr + 4);
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logGlobal->warn("Version number reversed is %x, checking...", vstd::to_underlying(serializer.version));
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if(serializer.version == ESerializationVersion::CURRENT)
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{
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logGlobal->warn("%s seems to have different endianness! Entering reversing mode.", fname.string());
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serializer.reverseEndianness = true;
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}
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else
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throw std::runtime_error("Error: too new file format detected in '" + fname.string() + "'!");
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}
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std::string loaded = SAVEGAME_MAGIC;
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sfile.read(loaded.data(), SAVEGAME_MAGIC.length());
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if(loaded != SAVEGAME_MAGIC)
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throw std::runtime_error("Magic bytes doesn't match!");
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}
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int CLoadFile::read(std::byte * data, unsigned size)
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{
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sfile.read(reinterpret_cast<char *>(data), size);
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return size;
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}
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VCMI_LIB_NAMESPACE_END
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