1/*
2 * Copyright (c) 1999, 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29/*
30	File:		comp.h
31
32	Contains:	Glue between core prng code to the Zlib library.
33
34	Written by:	Counterpane, Inc.
35
36	Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
37
38	Change History (most recent first):
39
40		02/10/99	dpm		Created, based on Counterpane source.
41
42*/
43/* comp.h
44
45   Header for the compression routines added to the Counterpane PRNG.
46*/
47
48#ifndef __YARROW_COMP_H__
49#define __YARROW_COMP_H__
50
51#include "smf.h"
52
53/*
54 * Kernel version does NULL compression....
55 */
56#define YARROW_KERNEL
57
58#ifdef	YARROW_KERNEL
59/*
60 * Shrink this down to almost nothing to simplify kernel port;
61 * with additional hacking on prng.c, this could go away entirely
62 */
63typedef char COMP_CTX;
64
65/* and define some type3s normally picked up from zlib */
66typedef unsigned char Bytef;
67typedef unsigned uInt;
68
69#else
70
71#include "zlib.h"
72
73/* Top level compression context */
74typedef struct{
75	MMPTR buf;
76	uInt spaceused;
77} COMP_CTX;
78#endif	/* YARROW_KERNEL */
79
80typedef enum comp_error_status {
81	COMP_SUCCESS = 0,
82	COMP_ERR_NULL_POINTER,
83	COMP_ERR_LOW_MEMORY,
84	COMP_ERR_LIB
85} comp_error_status;
86
87/* Exported functions from compress.c */
88comp_error_status comp_init(COMP_CTX* ctx);
89comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
90comp_error_status comp_end(COMP_CTX* ctx);
91comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
92
93#endif
94