122 lines
2.1 KiB
C++
122 lines
2.1 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CReadFile.h"
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#include "utils/file_utils.hpp"
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namespace irr
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{
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namespace io
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{
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CReadFile::CReadFile(const io::path& fileName)
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: File(0), FileSize(0), Filename(fileName)
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{
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#ifdef _DEBUG
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setDebugName("CReadFile");
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#endif
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openFile();
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}
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CReadFile::~CReadFile()
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{
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if (File)
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fclose(File);
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}
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//! returns how much was read
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s32 CReadFile::read(void* buffer, u32 sizeToRead)
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{
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if (!isOpen())
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return 0;
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return (s32)fread(buffer, 1, sizeToRead, File);
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}
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//! changes position in file, returns true if successful
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//! if relativeMovement==true, the pos is changed relative to current pos,
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//! otherwise from begin of file
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bool CReadFile::seek(long finalPos, bool relativeMovement)
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{
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if (!isOpen())
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return false;
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return fseek(File, finalPos, relativeMovement ? SEEK_CUR : SEEK_SET) == 0;
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}
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//! returns size of file
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long CReadFile::getSize() const
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{
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return FileSize;
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}
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//! returns where in the file we are.
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long CReadFile::getPos() const
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{
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return ftell(File);
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}
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//! opens the file
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void CReadFile::openFile()
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{
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if (Filename.size() == 0) // bugfix posted by rt
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{
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File = 0;
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return;
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}
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File = FileUtils::fopenU8Path(Filename.c_str(), "rb");
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if (File)
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{
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// get FileSize, check for errors
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// See https://stackoverflow.com/questions/18192998/plain-c-opening-a-directory-with-fopen
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if (fseek(File, 0, SEEK_END) < 0)
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goto error;
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s32 file_size = (s32)ftell(File);
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if (file_size == -1)
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goto error;
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FileSize = file_size;
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if (fseek(File, 0, SEEK_SET) < 0)
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goto error;
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}
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return;
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error:
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fclose(File);
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File = 0;
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}
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//! returns name of file
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const io::path& CReadFile::getFileName() const
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{
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return Filename;
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}
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IReadFile* createReadFile(const io::path& fileName)
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{
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CReadFile* file = new CReadFile(fileName);
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if (file->isOpen())
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return file;
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file->drop();
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return 0;
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}
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} // end namespace io
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} // end namespace irr
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