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+/*
+ * Copyright (c) 1999, 2000-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/*
+	File:		comp.h
+
+	Contains:	Glue between core prng code to the Zlib library.
+
+	Written by:	Counterpane, Inc. 
+
+	Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
+
+	Change History (most recent first):
+
+		02/10/99	dpm		Created, based on Counterpane source.
+ 
+*/
+/* comp.h
+
+   Header for the compression routines added to the Counterpane PRNG. 
+*/
+
+#ifndef __YARROW_COMP_H__
+#define __YARROW_COMP_H__
+
+#include "smf.h"
+
+/*
+ * Kernel version does NULL compression....
+ */
+#define YARROW_KERNEL
+
+#ifdef	YARROW_KERNEL
+/* 
+ * Shrink this down to almost nothing to simplify kernel port;
+ * with additional hacking on prng.c, this could go away entirely
+ */
+typedef char COMP_CTX;
+
+/* and define some type3s normally picked up from zlib */
+typedef unsigned char Bytef;
+typedef unsigned uInt;
+
+#else
+
+#include "zlib.h"
+
+/* Top level compression context */
+typedef struct{
+	MMPTR buf;
+	uInt spaceused;
+} COMP_CTX;
+#endif	/* YARROW_KERNEL */
+
+typedef enum comp_error_status {
+	COMP_SUCCESS = 0,
+	COMP_ERR_NULL_POINTER,
+	COMP_ERR_LOW_MEMORY,
+	COMP_ERR_LIB
+} comp_error_status;
+
+/* Exported functions from compress.c */
+comp_error_status comp_init(COMP_CTX* ctx);
+comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
+comp_error_status comp_end(COMP_CTX* ctx);
+comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
+
+#endif