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/*
* This file is part of the Colobot: Gold Edition source code
* Copyright (C) 2001-2014, Daniel Roux, EPSITEC SA & TerranovaTeam
* http://epsiteс.ch; http://colobot.info; http://github.com/colobot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://gnu.org/licenses
*/
#include "common/resources/inputstreambuffer.h"
#include <stdexcept>
#include <sstream>
CInputStreamBuffer::CInputStreamBuffer(size_t buffer_size) : m_buffer_size(buffer_size)
{
if (buffer_size <= 0)
{
throw std::runtime_error("File buffer must be larger then 0 bytes");
}
m_buffer = new char[buffer_size];
m_file = nullptr;
}
CInputStreamBuffer::~CInputStreamBuffer()
{
close();
delete m_buffer;
}
void CInputStreamBuffer::open(const std::string &filename)
{
if (PHYSFS_isInit())
m_file = PHYSFS_openRead(filename.c_str());
}
void CInputStreamBuffer::close()
{
if (is_open())
PHYSFS_close(m_file);
}
bool CInputStreamBuffer::is_open()
{
return m_file;
}
size_t CInputStreamBuffer::size()
{
return PHYSFS_fileLength(m_file);
}
std::streambuf::int_type CInputStreamBuffer::underflow()
{
if (gptr() < egptr())
return traits_type::to_int_type(*gptr());
if (PHYSFS_eof(m_file))
return traits_type::eof();
PHYSFS_sint64 read_count = PHYSFS_read(m_file, m_buffer, sizeof(char), m_buffer_size);
if (read_count <= 0)
return traits_type::eof();
setg(m_buffer, m_buffer, m_buffer + read_count);
return traits_type::to_int_type(*gptr());
}
std::streampos CInputStreamBuffer::seekpos(std::streampos sp, std::ios_base::openmode which)
{
return seekoff(off_type(sp), std::ios_base::beg, which);
}
std::streampos CInputStreamBuffer::seekoff(std::streamoff off, std::ios_base::seekdir way, std::ios_base::openmode which)
{
/* A bit of explanation:
We are reading file by m_buffer_size parts so our 3 internal pointers will be
* eback (not used here) - start of block
* gptr - position of read cursor in block
* egtpr - end of block
off argument is relative to way */
std::streamoff new_position;
switch (way)
{
case std::ios_base::beg:
new_position = off;
break;
case std::ios_base::cur:
// tell will give cursor at begining of block so we have to add where in block we currently are
new_position = off + static_cast<off_type>(PHYSFS_tell(m_file)) - static_cast<off_type> (egptr() - gptr());
break;
case std::ios_base::end:
new_position = off + static_cast<off_type>(PHYSFS_fileLength(m_file));
break;
default:
break;
}
if (PHYSFS_seek(m_file, new_position))
{
setg(m_buffer, m_buffer, m_buffer); // reset buffer
return pos_type(new_position);
}
return pos_type(off_type(-1));
}
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