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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2013 Marcin Bukat
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include <tlsf.h>
#include "lua.h"
static const unsigned int sentinel = 0xBA5EFAC7;
#define SENTINEL(n) (sentinel ^ (n))
static char *pluginbuf_ptr = NULL;
static size_t pluginbuf_size = 0;
static char *audiobuf_ptr = NULL;
static size_t audiobuf_size = 0;
static void set_sentinel(void* buf, size_t size)
{
size_t i;
unsigned int *b = (int*) buf;
for(i = 0; i < size / sizeof(sentinel); i++)
*b++ = SENTINEL(i);
}
static size_t check_sentinel(void* buf, size_t size)
{
const size_t sz = size / sizeof(sentinel);
size_t unused = 0;
size_t i;
unsigned int *b = (int*) buf;
for(i = 0; i < sz; i++)
if (b[i] == SENTINEL(i))
{
unused++;
while(++i < sz && b[i] == SENTINEL(i) && ++unused)
{;;}
}
return unused * sizeof(sentinel);
}
size_t rock_get_allocated_bytes(void)
{
return pluginbuf_size + audiobuf_size;
}
size_t rock_get_unused_bytes(void)
{
size_t unused = 0;
if (pluginbuf_size)
unused += check_sentinel(pluginbuf_ptr, pluginbuf_size);
if (audiobuf_size)
unused += check_sentinel(audiobuf_ptr, audiobuf_size);
return unused;
}
void *get_new_area(size_t *size)
{
if (pluginbuf_ptr == NULL)
{
pluginbuf_ptr = rb->plugin_get_buffer(size);
pluginbuf_size = *size;
set_sentinel(pluginbuf_ptr, pluginbuf_size);
/* kill tlsf signature if any */
memset(pluginbuf_ptr, 0, 4);
return pluginbuf_ptr;
}
/* only grab the next area if lua already tried + failed to garbage collect*/
if (audiobuf_ptr == NULL && (get_lua_OOM())->count > 0)
{
/* grab audiobuffer */
audiobuf_ptr = rb->plugin_get_audio_buffer(size);
audiobuf_size = *size;
set_sentinel(audiobuf_ptr, audiobuf_size);
return audiobuf_ptr;
}
return ((void *) ~0);
}
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