mirror of https://gitee.com/openkylin/vtk9.git
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkInputStream.cxx
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkInputStream.h"
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#include "vtkObjectFactory.h"
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vtkStandardNewMacro(vtkInputStream);
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//------------------------------------------------------------------------------
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vtkInputStream::vtkInputStream()
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{
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this->Stream = nullptr;
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}
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//------------------------------------------------------------------------------
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vtkInputStream::~vtkInputStream()
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{
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this->SetStream(nullptr);
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}
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//------------------------------------------------------------------------------
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void vtkInputStream::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os, indent);
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os << indent << "Stream: " << (this->Stream ? "set" : "none") << "\n";
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}
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//------------------------------------------------------------------------------
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void vtkInputStream::StartReading()
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{
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if (!this->Stream)
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{
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vtkErrorMacro("StartReading() called with no Stream set.");
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return;
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}
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this->StreamStartPosition = this->Stream->tellg();
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}
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//------------------------------------------------------------------------------
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void vtkInputStream::EndReading() {}
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//------------------------------------------------------------------------------
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int vtkInputStream::Seek(vtkTypeInt64 offset)
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{
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std::streamoff off = static_cast<std::streamoff>(this->StreamStartPosition + offset);
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return (this->Stream->seekg(off, std::ios::beg) ? 1 : 0);
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}
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//------------------------------------------------------------------------------
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size_t vtkInputStream::Read(void* data, size_t length)
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{
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return this->ReadStream(static_cast<char*>(data), length);
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}
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//------------------------------------------------------------------------------
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size_t vtkInputStream::ReadStream(char* data, size_t length)
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{
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this->Stream->read(data, length);
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return this->Stream->gcount();
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}
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