bsd/dev/random/YarrowCoreLib/src/comp.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 /*
  32         File:           comp.h
  33
  34         Contains:       Glue between core prng code to the Zlib library.
  35
  36         Written by:     Counterpane, Inc.
  37
  38         Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
  39
  40         Change History (most recent first):
  41
  42                 02/10/99        dpm             Created, based on Counterpane source.
  43
  44 */
  45 /* comp.h
  46
  47    Header for the compression routines added to the Counterpane PRNG.
  48 */
  49
  50 #ifndef __YARROW_COMP_H__
  51 #define __YARROW_COMP_H__
  52
  53 #include "smf.h"
  54
  55 /*
  56  * Kernel version does NULL compression....
  57  */
  58 #define YARROW_KERNEL
  59
  60 #ifdef  YARROW_KERNEL
  61 /*
  62  * Shrink this down to almost nothing to simplify kernel port;
  63  * with additional hacking on prng.c, this could go away entirely
  64  */
  65 typedef char COMP_CTX;
  66
  67 /* and define some type3s normally picked up from zlib */
  68 typedef unsigned char Bytef;
  69 typedef unsigned uInt;
  70
  71 #else
  72
  73 #include "zlib.h"
  74
  75 /* Top level compression context */
  76 typedef struct{
  77         MMPTR buf;
  78         uInt spaceused;
  79 } COMP_CTX;
  80 #endif  /* YARROW_KERNEL */
  81
  82 typedef enum comp_error_status {
  83         COMP_SUCCESS = 0,
  84         COMP_ERR_NULL_POINTER,
  85         COMP_ERR_LOW_MEMORY,
  86         COMP_ERR_LIB
  87 } comp_error_status;
  88
  89 /* Exported functions from compress.c */
  90 comp_error_status comp_init(COMP_CTX* ctx);
  91 comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
  92 comp_error_status comp_end(COMP_CTX* ctx);
  93 comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
  94
  95 #endif