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101 lines
2.8 KiB
C++
101 lines
2.8 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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CLoadFile::CLoadFile(const boost::filesystem::path & fname, ESerializationVersion minimalVersion)
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: serializer(this)
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{
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openNextFile(fname, minimalVersion);
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}
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//must be instantiated in .cpp file for access to complete types of all member fields
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CLoadFile::~CLoadFile() = default;
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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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void CLoadFile::openNextFile(const boost::filesystem::path & fname, ESerializationVersion minimalVersion)
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{
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assert(!serializer.reverseEndianness);
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assert(minimalVersion <= ESerializationVersion::CURRENT);
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try
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{
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fName = fname.string();
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sfile = std::make_unique<std::fstream>(fname.c_str(), std::ios::in | std::ios::binary);
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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_FORMAT("Error: cannot open to read %s!", fName);
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//we can read
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char buffer[4];
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sfile->read(buffer, 4);
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if(std::memcmp(buffer, "VCMI", 4) != 0)
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THROW_FORMAT("Error: not a VCMI file(%s)!", fName);
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serializer & serializer.version;
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if(serializer.version < minimalVersion)
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THROW_FORMAT("Error: too old file format (%s)!", fName);
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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);
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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_FORMAT("Error: too new file format (%s)!", fName);
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}
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}
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catch(...)
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{
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clear(); //if anything went wrong, we delete file and rethrow
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throw;
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}
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}
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void CLoadFile::reportState(vstd::CLoggerBase * out)
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{
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out->debug("CLoadFile");
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if(!!sfile && *sfile)
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out->debug("\tOpened %s Position: %d", fName, sfile->tellg());
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}
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void CLoadFile::clear()
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{
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sfile = nullptr;
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fName.clear();
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serializer.version = ESerializationVersion::NONE;
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}
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void CLoadFile::checkMagicBytes(const std::string &text)
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{
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std::string loaded = text;
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read(reinterpret_cast<std::byte*>(loaded.data()), text.length());
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if(loaded != text)
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throw std::runtime_error("Magic bytes doesn't match!");
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}
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VCMI_LIB_NAMESPACE_END
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