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/*
$Id: module_reader.cpp,v 1.2 2001/03/13 21:43:02 sphair Exp $
------------------------------------------------------------------------
ClanLib, the platform independent game SDK.
This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
version 2. See COPYING for details.
For a total list of contributers see CREDITS.
------------------------------------------------------------------------
File purpose:
Module reader for MikMod
*/
#include "module_reader.h"
#include "../API/Core/IOData/inputsource.h"
BOOL clanlib_reader_feof(MREADER* reader)
// eof function, returns TRUE if we are at the end of the file.
// Since CL_InputSource does not have a built-in eof function,
// we compare the current position to the size of the file.
{
return (((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->tell()
>= (((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->size()));
}
BOOL clanlib_reader_read(MREADER* reader,void* ptr,size_t size)
// read function, puts the data in a buffer.
// Even if the return type is BOOL, the function returns the number
// of bytes read. MikMod does the same internally.
{
return (((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->read(ptr,size));
}
int clanlib_reader_get(MREADER* reader)
// get function, returns a single char from the file
{
return (((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->read_char8());
}
BOOL clanlib_reader_seek(MREADER* reader,long offset,int whence)
// seek function, goes to a given position. It's important to note that
// this function is truely necessary for MikMod, and it has to be able to
// go back, ie rewind the file. ClanLib's implementation of this "go back"
// feature is really slow because files are compressed. This is a
// compromise.
{
CL_InputSource::SeekEnum cl_whence;
switch (whence)
{
case SEEK_SET:
cl_whence=CL_InputSource::seek_set;
break;
case SEEK_CUR:
cl_whence=CL_InputSource::seek_cur;
break;
case SEEK_END:
cl_whence=CL_InputSource::seek_end;
break;
default:
cl_whence=CL_InputSource::seek_set;
}
((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->seek(offset,cl_whence);
return 0;
}
long clanlib_reader_tell(MREADER* reader)
// tell function, returns the current position in the file.
{
return (((CL_InputSource *) (((MCLANLIBREADER *) reader)->input))->tell());
}
MREADER *new_clanlib_reader(void *input)
// creates a reader. We need this for MCLANLIBREADER is a plain struct
// and not a class, so we have to construct it "manually".
{
MCLANLIBREADER* reader=new MCLANLIBREADER;
if (reader)
{
reader->core.Eof =&clanlib_reader_feof;
reader->core.Read=&clanlib_reader_read;
reader->core.Get =&clanlib_reader_get;
reader->core.Seek=&clanlib_reader_seek;
reader->core.Tell=&clanlib_reader_tell;
reader->input=input;
}
return (MREADER*)reader;
}
void delete_clanlib_reader (MREADER* reader)
// deletes the reader. Needed since MCLANLIBREADER is a struct and not
// a C++ class.
{
if (reader!=NULL) delete(reader);
}
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