/**
* relative seek
**/
::std::streampos seekoff(::std::streamoff off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which)
{
// absolute seek
if ( way == ::std::ios_base::beg )
{
return seekpos(off,which);
}
// seek relative to current position
else if ( way == ::std::ios_base::cur )
{
if ( which == std::ios_base::in )
{
return seekpos(readpos + (gptr()-eback()),which);
}
else if ( which == std::ios_base::out )
{
return seekpos(writepos + (pptr()-pbase()),which);
}
else
{
return -1;
}
}
// seek relative to end of file
else if ( way == ::std::ios_base::end )
{
off_t const endoff = fd->getFileSize();
return seekpos(endoff+off,which);
}
else
{
return -1;
}
}
MemoryInputStreamBuffer(
std::string const & rfn,
int64_t const rblocksize,
uint64_t const rputbackspace = 0
)
:
fd(doOpen(rfn)),
filesize(fd->getFileSize()),
blocksize((rblocksize < 0) ? getDefaultBlockSize() : rblocksize),
putbackspace(rputbackspace),
buffer(putbackspace + blocksize,false),
symsread(0)
{
init(false);
}
