playlist.cpp

Yet another mp3 player, but this time using SVGALib under Linux. The idea was to use a 320x240 disp

/* 
  playlist.cpp  Playlist management class

  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 2 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, www.gnu.org.

  Copyright (C) 2000  Simon Harrison (email smh@[e-mail])
*/


#include "playlist.h"


CListItem::CListItem(char* value) 
{
     if (value) {
       int tlen = strlen(value);
       text = new char[tlen+1];
       if (text) {
          strcpy( text,value );
          len = tlen;
       } else { 
          len=0; 
       }
     } else {
       text = NULL;
       len = 0;
     }
     next = NULL;
 
}


CPlayList::Add( char* text ) { // add the text to the tail.
   CListItem* t = plist;
   if (plist) {
      while (t->GetNext()) t=t->GetNext(); 
      t->SetNext( new CListItem( text ) );
   } else {
      plist = new CListItem( text ); 
   }
   changed = true;
   Entries++;
}


int CPlayList::ChopHead( ) {
   if (plist) { 
     CListItem* t=plist->GetNext();
     delete plist;
     plist = t;
     Entries--;
     changed = true;
     return 1;
   } else {
     return 0;
   }
}


CPlayList::DeleteAtIndex( int i ) 
{   // zero based index.
      changed = true;
      if (i>=Entries) return 0;
      if (i) {
        SetPtrAtIndex( i-1 );
        CListItem* t = ptemp->GetNext();
        CListItem* next = t->GetNext();
        delete t;
        ptemp->SetNext( next );  // repair the hole.
      } else {   // special case for first item.
        CListItem* t=plist->GetNext();
        delete plist;
        plist = t;      
      }
      Entries--;
}

void CPlayList::Clean() 
//
// Remove all entries from playlist.
{
   while (ChopHead()) {;}
}


CPlayList::DebugWriteOut() {
    CListItem* t = plist;
    if (plist) {
       int n=0;
       while (t) {
          printf( "Element %d : %s\n", n++, t->GetText() );
          t=t->GetNext();
       }
    } else {
       printf( "-- No elements in list. --\n" );
    }
}


int CPlayList::ReadFromFile( char* fname )
//  Read full path names from file fname.
{
char buffer[1024];
char* p;
   Clean();
   FILE* fd = fopen( fname, "r" );
   if (fd) {
      while (!feof(fd)) {
         buffer[0]=0;
         fgets( buffer, 1024, fd );
         if (p = strrchr(buffer, '\n' )) {
            *p = 0;
         }
         if (buffer[0]) {                 
	    Add(buffer);
         }
      }
      fclose( fd );
   }
}


int CPlayList::WriteToFile( char* fname )
{
FILE* fd = fopen( fname, "w+" );
   if (fd) {
      CListItem* t = plist;
      if (plist) {
         int n=0;
         while (t) {
            fprintf( fd, "%s\n", t->GetText() );
            t=t->GetNext();
         }
      }
      fclose( fd );
   }
}


/*
main () {
  CPlayList pl;
  pl.DebugWriteOut();
  pl.Add( "boo" );
  pl.Add( "boo hoo" );
  pl.DebugWriteOut();
  printf( "writing to file.\n" );
  pl.WriteToFile( "filedump" );
  pl.ReadFromFile( "filedump" );
  pl.Add( "and this is the last one" );
  pl.SetPtrAtIndex( 0 );
  char* t="temp";
  while (t) {
    t = pl.GetNext();
    if (t) {
      printf( "Next is : %s\n", t );
    } else {
      printf( "- End of list -\n" );
    }
  }
}
*/