xnu-201.tar.gz

[apple/xnu.git] / bsd / dev / random / YarrowCoreLib / src / comp.h

diff --git a/bsd/dev/random/YarrowCoreLib/src/comp.h b/bsd/dev/random/YarrowCoreLib/src/comp.h
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+/*
+ * Copyright (c) 1999, 2000-2001 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This 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 OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_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