17e5399d3d
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28018 a1c6a512-1295-4272-9138-f99709370657
58 lines
2 KiB
C
58 lines
2 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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* $Id$
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*
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* This is a memory allocator designed to provide reasonable management of free
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* space and fast access to allocated data. More than one allocator can be used
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* at a time by initializing multiple contexts.
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*
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* Copyright (C) 2009 Andrew Mahone
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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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#ifndef _BUFLIB_H_
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#include <plugin.h>
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union buflib_data
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{
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intptr_t val;
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union buflib_data *ptr;
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};
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struct buflib_context
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{
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union buflib_data *handle_table;
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union buflib_data *first_free_handle;
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union buflib_data *last_handle;
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union buflib_data *first_free_block;
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union buflib_data *buf_start;
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union buflib_data *alloc_end;
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bool compact;
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};
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void buflib_init(struct buflib_context *context, void *buf, size_t size);
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int buflib_alloc(struct buflib_context *context, size_t size);
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void buflib_free(struct buflib_context *context, int handle);
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void* buflib_buffer_out(struct buflib_context *ctx, size_t *size);
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void buflib_buffer_in(struct buflib_context *ctx, int size);
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static inline void* buflib_get_data(struct buflib_context *context, int handle)
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{
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return (void*)(context->handle_table[-handle].ptr);
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}
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#endif
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