mirror of
https://github.com/vcmi/vcmi.git
synced 2024-12-04 09:42:40 +02:00
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
|
|
* CLoadFile.cpp, part of VCMI engine
|
|
*
|
|
* Authors: listed in file AUTHORS in main folder
|
|
*
|
|
* License: GNU General Public License v2.0 or later
|
|
* Full text of license available in license.txt file, in main folder
|
|
*
|
|
*/
|
|
#include "StdInc.h"
|
|
#include "CLoadFile.h"
|
|
|
|
VCMI_LIB_NAMESPACE_BEGIN
|
|
|
|
CLoadFile::CLoadFile(const boost::filesystem::path & fname, ESerializationVersion minimalVersion)
|
|
: serializer(this)
|
|
{
|
|
openNextFile(fname, minimalVersion);
|
|
}
|
|
|
|
//must be instantiated in .cpp file for access to complete types of all member fields
|
|
CLoadFile::~CLoadFile() = default;
|
|
|
|
int CLoadFile::read(std::byte * data, unsigned size)
|
|
{
|
|
sfile->read(reinterpret_cast<char *>(data), size);
|
|
return size;
|
|
}
|
|
|
|
void CLoadFile::openNextFile(const boost::filesystem::path & fname, ESerializationVersion minimalVersion)
|
|
{
|
|
assert(!serializer.reverseEndianness);
|
|
assert(minimalVersion <= ESerializationVersion::CURRENT);
|
|
|
|
try
|
|
{
|
|
fName = fname.string();
|
|
sfile = std::make_unique<std::fstream>(fname.c_str(), std::ios::in | std::ios::binary);
|
|
sfile->exceptions(std::ifstream::failbit | std::ifstream::badbit); //we throw a lot anyway
|
|
|
|
if(!(*sfile))
|
|
THROW_FORMAT("Error: cannot open to read %s!", fName);
|
|
|
|
//we can read
|
|
char buffer[4];
|
|
sfile->read(buffer, 4);
|
|
if(std::memcmp(buffer, "VCMI", 4) != 0)
|
|
THROW_FORMAT("Error: not a VCMI file(%s)!", fName);
|
|
|
|
serializer & serializer.version;
|
|
if(serializer.version < minimalVersion)
|
|
THROW_FORMAT("Error: too old file format (%s)!", fName);
|
|
|
|
if(serializer.version > ESerializationVersion::CURRENT)
|
|
{
|
|
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);
|
|
|
|
auto * versionptr = reinterpret_cast<char *>(&serializer.version);
|
|
std::reverse(versionptr, versionptr + 4);
|
|
logGlobal->warn("Version number reversed is %x, checking...", vstd::to_underlying(serializer.version));
|
|
|
|
if(serializer.version == ESerializationVersion::CURRENT)
|
|
{
|
|
logGlobal->warn("%s seems to have different endianness! Entering reversing mode.", fname.string());
|
|
serializer.reverseEndianness = true;
|
|
}
|
|
else
|
|
THROW_FORMAT("Error: too new file format (%s)!", fName);
|
|
}
|
|
}
|
|
catch(...)
|
|
{
|
|
clear(); //if anything went wrong, we delete file and rethrow
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void CLoadFile::reportState(vstd::CLoggerBase * out)
|
|
{
|
|
out->debug("CLoadFile");
|
|
if(!!sfile && *sfile)
|
|
out->debug("\tOpened %s Position: %d", fName, sfile->tellg());
|
|
}
|
|
|
|
void CLoadFile::clear()
|
|
{
|
|
sfile = nullptr;
|
|
fName.clear();
|
|
serializer.version = ESerializationVersion::NONE;
|
|
}
|
|
|
|
void CLoadFile::checkMagicBytes(const std::string &text)
|
|
{
|
|
std::string loaded = text;
|
|
read(reinterpret_cast<std::byte*>(loaded.data()), text.length());
|
|
if(loaded != text)
|
|
throw std::runtime_error("Magic bytes doesn't match!");
|
|
}
|
|
|
|
VCMI_LIB_NAMESPACE_END
|