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vcmi/lib/filesystem/CFileInputStream.cpp
Ivan Savenko b87897096c Filesystem handling is now more flexible
- removed CResourceLoader class in favor of one that implements resource loader interface
- removed global pool of files, in favour of more dynamic approach
- renamed some files to match current situation
All these changes are needed mostly for future mod manager + .zip support
2013-07-28 14:49:50 +00:00

75 lines
1.5 KiB
C++

#include "StdInc.h"
#include "CFileInputStream.h"
#include "CFileInfo.h"
CFileInputStream::CFileInputStream(const std::string & file, si64 start, si64 size)
{
open(file, start, size);
}
CFileInputStream::CFileInputStream(const CFileInfo & file, si64 start, si64 size)
{
open(file.getName(), start, size);
}
CFileInputStream::~CFileInputStream()
{
fileStream.close();
}
void CFileInputStream::open(const std::string & file, si64 start, si64 size)
{
fileStream.open(file.c_str(), std::ios::in | std::ios::binary);
if (fileStream.fail())
{
throw std::runtime_error("File " + file + " isn't available.");
}
dataStart = start;
dataSize = size;
if (dataSize == 0)
{
fileStream.seekg(0, std::ios::end);
dataSize = tell();
}
fileStream.seekg(start, std::ios::beg);
}
si64 CFileInputStream::read(ui8 * data, si64 size)
{
si64 origin = tell();
si64 toRead = std::min(dataSize - origin, size);
fileStream.read(reinterpret_cast<char *>(data), toRead);
return fileStream.gcount();
}
si64 CFileInputStream::seek(si64 position)
{
fileStream.seekg(dataStart + std::min(position, dataSize));
return tell();
}
si64 CFileInputStream::tell()
{
return fileStream.tellg() - dataStart;
}
si64 CFileInputStream::skip(si64 delta)
{
si64 origin = tell();
//ensure that we're not seeking past the end of real data
si64 toSeek = std::min(dataSize - origin, delta);
fileStream.seekg(toSeek, std::ios::cur);
return tell() - origin;
}
si64 CFileInputStream::getSize()
{
return dataSize;
}