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/*----------------------------------------------------------------------------
libtunepimp -- The MusicBrainz tagging library.
Let a thousand taggers bloom!
Copyright (C) Robert Kaye 2003
Originally part of bitcollider from the Bitzi Corporation.
This file is part of libtunepimp.
libtunepimp 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.
libtunepimp 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.
You should have received a copy of the GNU General Public License
along with libtunepimp; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$Id: plugins.cpp 1300 2004-05-06 22:54:33Z robert $
----------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include "../libltdl/ltdl.h"
#include "plugins.h"
#include <map>
using namespace std;
/*------------------------------------------------------------------------- */
#define DB printf("%s:%d\n", __FILE__, __LINE__);
/*------------------------------------------------------------------------- */
#define ERROR_FILENOTFOUND "File not found."
/*------------------------------------------------------------------------- */
Plugins::Plugins(void)
{
lt_dlinit();
}
Plugins::~Plugins(void)
{
unload();
lt_dlexit();
}
int Plugins::load(const char *path, bool printDebugInfo)
{
DIR *dir;
struct dirent *entry;
int j, i, numFormats;
char *ptr, file[MAX_PATH], init_func[255];
Plugin *(*init_function)(void);
dir = opendir(path);
if (dir == NULL)
return 0;
for(;;)
{
PluginInfo info;
/* Scan the given dir for plugins */
entry = readdir(dir);
if (!entry)
break;
ptr = strrchr(entry->d_name, '.');
if (!ptr || strcasecmp(ptr, ".tpp"))
continue;
sprintf(file, "%s/%s", path, entry->d_name);
if (printDebugInfo)
fprintf(stderr, " %s: ", file);
/* Found one, lets open it */
info.handle = lt_dlopen(file);
if (info.handle == NULL)
{
if (printDebugInfo)
fprintf(stderr, "Cannot load plugin %s. (%s)\n",
file, lt_dlerror());
continue;
}
strcpy(info.file, entry->d_name);
strcpy(init_func, entry->d_name);
ptr = strrchr(init_func, '.');
if (ptr)
*ptr = 0;
strcat(init_func, "InitPlugin");
/* Opened plugin ok, now locate our entry function */
init_function = (Plugin *(*)(void))lt_dlsym((lt_dlhandle_struct *)info.handle, init_func);
if (init_function == NULL)
{
if (printDebugInfo)
fprintf(stderr, "Cannot find entry point in %s (%s).\n", file, lt_dlerror());
lt_dlclose((lt_dlhandle_struct *)info.handle);
continue;
}
/* Init the plugin and get the methods provided by the plugin */
info.methods = (*init_function)();
if (info.methods == NULL)
{
lt_dlclose((lt_dlhandle_struct *)info.handle);
if (printDebugInfo)
fprintf(stderr, "Cannot retrieve supported methods from %s.\n", file);
continue;
}
numFormats = info.methods->getNumFormats();
for(i = 0; i != numFormats; i++)
{
CapInfo cap;
char ext[TP_EXTENSION_LEN];
char desc[TP_PLUGIN_DESC_LEN];
info.methods->getFormat(i, ext, desc, &cap.functions);
cap.ext = string(ext);
cap.desc = string(desc);
info.caps.push_back(cap);
}
if (printDebugInfo)
{
fprintf(stderr, "%s ", info.methods->getName());
fprintf(stderr, "(%s)\n", info.methods->getVersion());
}
/* Check to make sure that the given plugin hasnt already been loaded */
for(j = plugins.size() - 1; j >= 0; j--)
{
if (!strcmp(plugins[j].file, info.file))
{
if (printDebugInfo)
fprintf(stderr, " [Plugin %s has already been loaded. "
"Skipping.]\n", info.file);
info.methods->shutdown();
lt_dlclose((lt_dlhandle_struct *)info.handle);
break;
}
}
/* If we didn't already this plugin loaded, increment our counters */
if (j < 0)
plugins.push_back(info);
}
closedir(dir);
return plugins.size();
}
void Plugins::unload(void)
{
vector<PluginInfo>::iterator i;
for(i = plugins.begin(); i != plugins.end(); i++)
{
if ((*i).handle)
{
(*i).methods->shutdown();
lt_dlclose((lt_dlhandle_struct *)(*i).handle);
(*i).handle = NULL;
}
}
}
Plugin *Plugins::get(const string &extension, int functionFlags)
{
vector<PluginInfo>::iterator i;
vector<CapInfo>::iterator j;
for(i = plugins.begin(); i != plugins.end(); i++)
{
for(j = (*i).caps.begin(); j != (*i).caps.end(); j++)
{
if (strcasecmp((*j).ext.c_str(), extension.c_str()) == 0 &&
((*j).functions & functionFlags) == functionFlags)
return (*i).methods;
}
}
return NULL;
}
void Plugins::getSupportedExtensions(vector<string> &extList)
{
vector<PluginInfo>::iterator i;
vector<CapInfo>::iterator j;
map<string, int> exts;
map<string, int>::iterator k;
for(i = plugins.begin(); i != plugins.end(); i++)
{
for(j = (*i).caps.begin(); j != (*i).caps.end(); j++)
{
exts[(*j).ext] = 1;
}
}
extList.clear();
for(k = exts.begin(); k != exts.end(); k++)
extList.push_back((*k).first);
}
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