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/* Copyright (C) 1998 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: szlibxx.h,v 1.5 2002/06/16 05:00:54 lpd Exp $ */
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/* Implementation definitions for zlib interface */
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/* Must be compiled with -I$(ZSRCDIR) */
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#ifndef szlibxx_INCLUDED
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# define szlibxx_INCLUDED
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#include "szlibx.h"
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#include "zlib.h"
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/*
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* We don't want to allocate zlib's private data directly from
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* the C heap, but we must allocate it as immovable; and to avoid
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* garbage collection issues, we must keep GC-traceable pointers
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* to every block allocated. Since the stream state itself is movable,
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* we have to allocate an immovable block for the z_stream state as well.
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*/
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typedef struct zlib_block_s zlib_block_t;
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struct zlib_block_s {
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void *data;
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zlib_block_t *next;
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zlib_block_t *prev;
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};
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#define private_st_zlib_block() /* in szlibc.c */\
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gs_private_st_ptrs3(st_zlib_block, zlib_block_t, "zlib_block_t",\
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zlib_block_enum_ptrs, zlib_block_reloc_ptrs, next, prev, data)
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/* The typedef is in szlibx.h */
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/*typedef*/ struct zlib_dynamic_state_s {
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gs_memory_t *memory;
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zlib_block_t *blocks;
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z_stream zstate;
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} /*zlib_dynamic_state_t*/;
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#define private_st_zlib_dynamic_state() /* in szlibc.c */\
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gs_private_st_ptrs1(st_zlib_dynamic_state, zlib_dynamic_state_t,\
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"zlib_dynamic_state_t", zlib_dynamic_enum_ptrs, zlib_dynamic_reloc_ptrs,\
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blocks)
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/*
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* Provide zlib-compatible allocation and freeing functions.
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* The mem pointer actually points to the dynamic state.
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*/
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void *s_zlib_alloc(void *mem, uint items, uint size);
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void s_zlib_free(void *mem, void *address);
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/* Internal procedure to allocate and free the dynamic state. */
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int s_zlib_alloc_dynamic_state(stream_zlib_state *ss);
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void s_zlib_free_dynamic_state(stream_zlib_state *ss);
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#endif /* szlibxx_INCLUDED */
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