forked from len0rd/rockbox
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2013 Marcin Bukat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#include <tlsf.h>
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#include "lua.h"
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static const unsigned int sentinel = 0xBA5EFAC7;
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#define SENTINEL(n) (sentinel ^ (n))
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static char *pluginbuf_ptr = NULL;
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static size_t pluginbuf_size = 0;
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static char *audiobuf_ptr = NULL;
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static size_t audiobuf_size = 0;
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static void set_sentinel(void* buf, size_t size)
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{
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size_t i;
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unsigned int *b = (int*) buf;
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for(i = 0; i < size / sizeof(sentinel); i++)
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*b++ = SENTINEL(i);
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}
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static size_t check_sentinel(void* buf, size_t size)
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{
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const size_t sz = size / sizeof(sentinel);
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size_t unused = 0;
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size_t i;
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unsigned int *b = (int*) buf;
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for(i = 0; i < sz; i++)
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if (b[i] == SENTINEL(i))
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{
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unused++;
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while(++i < sz && b[i] == SENTINEL(i) && ++unused)
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{;;}
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}
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return unused * sizeof(sentinel);
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}
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size_t rock_get_allocated_bytes(void)
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{
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return pluginbuf_size + audiobuf_size;
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}
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size_t rock_get_unused_bytes(void)
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{
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size_t unused = 0;
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if (pluginbuf_size)
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unused += check_sentinel(pluginbuf_ptr, pluginbuf_size);
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if (audiobuf_size)
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unused += check_sentinel(audiobuf_ptr, audiobuf_size);
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return unused;
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}
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void *get_new_area(size_t *size)
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{
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if (pluginbuf_ptr == NULL)
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{
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pluginbuf_ptr = rb->plugin_get_buffer(size);
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pluginbuf_size = *size;
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set_sentinel(pluginbuf_ptr, pluginbuf_size);
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/* kill tlsf signature if any */
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memset(pluginbuf_ptr, 0, 4);
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return pluginbuf_ptr;
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}
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/* only grab the next area if lua already tried + failed to garbage collect*/
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if (audiobuf_ptr == NULL && (get_lua_OOM())->count > 0)
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{
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/* grab audiobuffer */
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audiobuf_ptr = rb->plugin_get_audio_buffer(size);
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audiobuf_size = *size;
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set_sentinel(audiobuf_ptr, audiobuf_size);
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return audiobuf_ptr;
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}
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*size = 0;
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return ((void *) ~0u);
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}
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