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

   1 /*
   2  * Copyright (c) 1999, 2000-2001 Apple Computer, 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  */
  63 typedef char COMP_CTX;
  64
  65 /* and define some type3s normally picked up from zlib */
  66 typedef unsigned char Bytef;
  67 typedef unsigned uInt;
  68
  69 #else
  70
  71 #include "zlib.h"
  72
  73 /* Top level compression context */
  74 typedef struct{
  75         MMPTR buf;
  76         uInt spaceused;
  77 } COMP_CTX;
  78 #endif  /* YARROW_KERNEL */
  79
  80 typedef 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 */
  88 comp_error_status comp_init(COMP_CTX* ctx);
  89 comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
  90 comp_error_status comp_end(COMP_CTX* ctx);
  91 comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
  92
  93 #endif