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/* Copyright (C) 1995, 1997, 1998, 1999 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: szlibc.c,v 1.6 2004/08/04 19:36:13 stefan Exp $ */
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/* Code common to zlib encoding and decoding streams */
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#include "std.h"
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#include "gserror.h"
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#include "gserrors.h"
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#include "gstypes.h"
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#include "gsmemory.h"
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#include "gsmalloc.h"
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#include "gsstruct.h"
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#include "strimpl.h"
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#include "szlibxx.h"
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#include "zconf.h"
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private_st_zlib_block();
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private_st_zlib_dynamic_state();
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public_st_zlib_state();
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/* Set defaults for stream parameters. */
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void
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s_zlib_set_defaults(stream_state * st)
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{
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stream_zlib_state *const ss = (stream_zlib_state *)st;
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ss->windowBits = MAX_WBITS;
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ss->no_wrapper = false;
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ss->level = Z_DEFAULT_COMPRESSION;
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ss->method = Z_DEFLATED;
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/* DEF_MEM_LEVEL should be in zlib.h or zconf.h, but it isn't. */
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ss->memLevel = min(MAX_MEM_LEVEL, 8);
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ss->strategy = Z_DEFAULT_STRATEGY;
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/* Clear pointers */
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ss->dynamic = 0;
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}
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/* Allocate the dynamic state. */
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int
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s_zlib_alloc_dynamic_state(stream_zlib_state *ss)
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{
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gs_memory_t *mem = ss->memory;
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zlib_dynamic_state_t *zds =
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gs_alloc_struct_immovable(mem, zlib_dynamic_state_t,
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&st_zlib_dynamic_state,
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"s_zlib_alloc_dynamic_state");
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ss->dynamic = zds;
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if (zds == 0)
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return_error(gs_error_VMerror);
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zds->blocks = 0;
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zds->memory = mem;
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zds->zstate.zalloc = (alloc_func)s_zlib_alloc;
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zds->zstate.zfree = (free_func)s_zlib_free;
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zds->zstate.opaque = (voidpf)zds;
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return 0;
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}
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/* Free the dynamic state. */
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void
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s_zlib_free_dynamic_state(stream_zlib_state *ss)
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{
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if (ss->dynamic)
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gs_free_object(ss->dynamic->memory, ss->dynamic,
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"s_zlib_free_dynamic_state");
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}
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/* Provide zlib-compatible allocation and freeing functions. */
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void *
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s_zlib_alloc(void *zmem, uint items, uint size)
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{
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zlib_dynamic_state_t *const zds = zmem;
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gs_memory_t *mem = zds->memory->stable_memory;
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zlib_block_t *block =
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gs_alloc_struct(mem, zlib_block_t, &st_zlib_block,
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"s_zlib_alloc(block)");
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void *data =
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gs_alloc_byte_array_immovable(mem, items, size, "s_zlib_alloc(data)");
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if (block == 0 || data == 0) {
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gs_free_object(mem, data, "s_zlib_alloc(data)");
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gs_free_object(mem, block, "s_zlib_alloc(block)");
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return Z_NULL;
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}
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block->data = data;
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block->next = zds->blocks;
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block->prev = 0;
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if (zds->blocks)
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zds->blocks->prev = block;
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zds->blocks = block;
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return data;
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}
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void
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s_zlib_free(void *zmem, void *data)
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{
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zlib_dynamic_state_t *const zds = zmem;
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gs_memory_t *mem = zds->memory->stable_memory;
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zlib_block_t *block = zds->blocks;
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gs_free_object(mem, data, "s_zlib_free(data)");
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for (; ; block = block->next) {
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if (block == 0) {
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lprintf1("Freeing unrecorded data 0x%lx!\n", (ulong)data);
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return;
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}
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if (block->data == data)
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break;
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}
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if (block->next)
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block->next->prev = block->prev;
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if (block->prev)
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block->prev->next = block->next;
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else
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zds->blocks = block->next;
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gs_free_object(mem, block, "s_zlib_free(block)");
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}
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