IFileStreambuf Class Reference

This class implements a C++ streambuf object for physfs files. More...

#include <ifile_streambuf.hpp>

Inherits streambuf.

List of all members.

Public Member Functions
	IFileStreambuf (const std::string &filename)
	~IFileStreambuf ()
Protected Member Functions
virtual int	underflow ()
virtual pos_type	seekoff (off_type pos, std::ios_base::seekdir, std::ios_base::openmode)
virtual pos_type	seekpos (pos_type pos, std::ios_base::openmode)
Private Member Functions
	IFileStreambuf (const IFileStreambuf &)
IFileStreambuf &	operator= (const IFileStreambuf &)
Private Attributes
PHYSFS_file *	file
char	buf [1024]

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Detailed Description

This class implements a C++ streambuf object for physfs files.

So that you can use normal istream operations on them

Definition at line 26 of file ifile_streambuf.hpp.

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Constructor & Destructor Documentation

IFileStreambuf::IFileStreambuf

(

const std::string &

filename

)

Definition at line 24 of file ifile_streambuf.cpp.

References file.

                                                        :
  file()
{
  // check this as PHYSFS seems to be buggy and still returns a
  // valid pointer in this case
  if(filename == "") {
    throw std::runtime_error("Couldn't open file: empty filename");
  }
  file = PHYSFS_openRead(filename.c_str());
  if(file == 0) {
    std::stringstream msg;
    msg << "Couldn't open file '" << filename << "': "
        << PHYSFS_getLastError();
    throw std::runtime_error(msg.str());
  }
}

IFileStreambuf::~IFileStreambuf

(

)

Definition at line 41 of file ifile_streambuf.cpp.

References file.

{
  PHYSFS_close(file);
}

IFileStreambuf::IFileStreambuf

(

const IFileStreambuf &

)

[private]

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Member Function Documentation

int IFileStreambuf::underflow

(

)

[protected, virtual]

Definition at line 47 of file ifile_streambuf.cpp.

References buf, and file.

{
  if(PHYSFS_eof(file)) {
    return traits_type::eof();
  }

  PHYSFS_sint64 bytesread = PHYSFS_read(file, buf, 1, sizeof(buf));
  if(bytesread <= 0) {
    return traits_type::eof();
  }
  setg(buf, buf, buf + bytesread);

  return buf[0];
}

IFileStreambuf::pos_type IFileStreambuf::seekoff	(	off_type	pos,
		std::ios_base::seekdir	,
		std::ios_base::openmode
	)			[protected, virtual]

Definition at line 75 of file ifile_streambuf.cpp.

References file, and seekpos().

{
  off_type pos = off;
  PHYSFS_sint64 ptell = PHYSFS_tell(file);

  switch(dir) {
    case std::ios_base::beg:
      break;
    case std::ios_base::cur:
      if(off == 0)
        return static_cast<pos_type> (ptell) - static_cast<pos_type> (egptr() - gptr());
      pos += static_cast<off_type> (ptell) - static_cast<off_type> (egptr() - gptr());
      break;
    case std::ios_base::end:
      pos += static_cast<off_type> (PHYSFS_fileLength(file));
      break;
    default:
      assert(false);
      return pos_type(off_type(-1));
  }

  return seekpos(static_cast<pos_type> (pos), mode);
}

IFileStreambuf::pos_type IFileStreambuf::seekpos	(	pos_type	pos,
		std::ios_base::openmode
	)			[protected, virtual]

Definition at line 63 of file ifile_streambuf.cpp.

References buf, and file.

Referenced by seekoff().

{
  if(PHYSFS_seek(file, static_cast<PHYSFS_uint64> (pos)) == 0) {
    return pos_type(off_type(-1));
  }

  // the seek invalidated the buffer
  setg(buf, buf, buf);
  return pos;
}

IFileStreambuf& IFileStreambuf::operator=

(

const IFileStreambuf &

)

[private]

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Member Data Documentation

PHYSFS_file* IFileStreambuf::file [private]

Definition at line 39 of file ifile_streambuf.hpp.

Referenced by IFileStreambuf(), seekoff(), seekpos(), underflow(), and ~IFileStreambuf().

char IFileStreambuf::buf[1024] [private]

Definition at line 40 of file ifile_streambuf.hpp.

Referenced by seekpos(), and underflow().

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The documentation for this class was generated from the following files:

• src/physfs/ifile_streambuf.hpp
• src/physfs/ifile_streambuf.cpp

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