gzdoom/src/s_playlist.cpp

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/*
** s_playlist.cpp
** Implementation of the FPlayList class. Handles m3u playlist parsing
**
**---------------------------------------------------------------------------
** Copyright 1998-2006 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include <stdlib.h>
#include "cmdlib.h"
#include "s_playlist.h"
#include "templates.h"
FPlayList::FPlayList (const char *path)
{
Songs = NULL;
SongList = NULL;
ChangeList (path);
}
FPlayList::~FPlayList ()
{
if (Songs) delete[] Songs;
if (SongList) delete[] SongList;
}
bool FPlayList::ChangeList (const char *path)
{
char linebuff[256];
size_t songlengths;
int songcount;
FILE *file;
if (Songs)
{
delete[] Songs;
Songs = NULL;
}
if (SongList)
{
delete[] SongList;
SongList = NULL;
}
Position = 0;
NumSongs = 0;
if ( (file = fopen (path, "r")) == NULL)
return false;
songlengths = 0;
songcount = 0;
while (NextLine (file, linebuff, sizeof(linebuff)))
{
songcount++;
songlengths += strlen (linebuff) + 1;
}
rewind (file);
if (songcount > 0)
{
Songs = new char *[songcount];
SongList = new char[songlengths];
NumSongs = songcount;
songlengths = 0;
for (songcount = 0; songcount < NumSongs &&
NextLine (file, linebuff, sizeof(linebuff)); songcount++)
{
size_t len = strlen (linebuff) + 1;
memcpy (SongList + songlengths, linebuff, len);
Songs[songcount] = SongList + songlengths;
songlengths += len;
}
NumSongs = songcount;
}
fclose (file);
return NumSongs > 0;
}
bool FPlayList::NextLine (FILE *file, char *buffer, int n)
{
char *skipper;
do
{
if (NULL == fgets (buffer, n, file))
return false;
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for (skipper = buffer; *skipper != 0 && *skipper <= ' '; skipper++)
;
} while (*skipper == '#' || *skipper == 0);
if (skipper > buffer)
memmove (buffer, skipper, strlen (skipper)+1);
if (buffer[strlen (buffer)-1] == '\n')
buffer[strlen (buffer)-1] = 0;
FixPathSeperator (buffer);
return true;
}
// Shuffles the playlist and resets the position to the start
void FPlayList::Shuffle ()
{
int i;
for (i = 0; i < NumSongs; ++i)
{
swap (Songs[i], Songs[(rand() % (NumSongs - i)) + i]);
}
Position = 0;
}
int FPlayList::GetNumSongs () const
{
return NumSongs;
}
int FPlayList::SetPosition (int position)
{
if ((unsigned)position >= (unsigned)NumSongs)
{
Position = 0;
}
else
{
Position = position;
}
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DPrintf ("Playlist position set to %d\n", Position);
return Position;
}
int FPlayList::GetPosition () const
{
return Position;
}
int FPlayList::Advance ()
{
if (++Position >= NumSongs)
{
Position = 0;
}
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DPrintf ("Playlist advanced to song %d\n", Position);
return Position;
}
int FPlayList::Backup ()
{
if (--Position < 0)
{
Position = NumSongs - 1;
}
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DPrintf ("Playlist backed up to song %d\n", Position);
return Position;
}
const char *FPlayList::GetSong (int position) const
{
if ((unsigned)position >= (unsigned)NumSongs)
return NULL;
return Songs[position];
}