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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: skin_buffer.c 25962 2010-05-12 09:31:40Z jdgordon $
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
* Copyright (C) 2010 Jonathan Gordon
*
* 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "skin_buffer.h"
#include "skin_parser.h"
/****************************************************************************
*
* This code handles buffer allocation for the entire skin system.
* This needs to work in 3 different situations:
* 1) as a stand alone library. ROCKBOX isnt defined, alloc using malloc()
* and free the skin elements only (no callbacks doing more allocation)
* 2) ROCKBOX builds for normal targets, alloc from a single big buffer
* which origionally came from the audio buffer, likely to run out of
* room with large themes. No need to free anything, just restore to
* the start of our buffer
* 3) ROCKBOX "application/hosted" builds, alloc using the hosts malloc().
* We need to keep track of all allocations so they can be free()'d easily
*
*
****************************************************************************/
#ifdef ROCKBOX
#include "config.h"
#include "skin_debug.h"
static size_t buf_size;
static unsigned char *buffer_start = NULL;
static unsigned char *buffer_front = NULL;
#ifndef __PCTOOL__
long skin_buffer_to_offset(void *pointer)
{
return pointer == NULL ? -1 : (void*)pointer - (void*)buffer_start;
}
void* skin_buffer_from_offset(long offset)
{
return offset < 0 ? NULL : buffer_start + offset;
}
#endif
void skin_buffer_init(char* buffer, size_t size)
{
buffer_start = buffer_front = buffer;
buf_size = size;
}
/* Allocate size bytes from the buffer */
#ifdef DEBUG_SKIN_ALLOCATIONS
void* skin_buffer_alloc_ex(size_t size, char* debug)
{
void *retval = NULL;
printf("%d %s\n", size, debug);
#else
void* skin_buffer_alloc(size_t size)
{
void *retval = NULL;
#endif
/* 32-bit aligned */
size = (size + 3) & ~3;
if (size > skin_buffer_freespace())
{
skin_error(MEMORY_LIMIT_EXCEEDED, NULL);
return NULL;
}
retval = buffer_front;
buffer_front += size;
return retval;
}
/* get the number of bytes currently being used */
size_t skin_buffer_usage(void)
{
return buffer_front - buffer_start;
}
size_t skin_buffer_freespace(void)
{
return buf_size - skin_buffer_usage();
}
#else
void* skin_buffer_alloc(size_t size)
{
return malloc(size);
}
#endif
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