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

   1 /*
   2  * Copyright (c) 1999, 2000-2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25         File:           comp.h
  26
  27         Contains:       Glue between core prng code to the Zlib library.
  28
  29         Written by:     Counterpane, Inc.
  30
  31         Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
  32
  33         Change History (most recent first):
  34
  35                 02/10/99        dpm             Created, based on Counterpane source.
  36
  37 */
  38 /* comp.h
  39
  40    Header for the compression routines added to the Counterpane PRNG.
  41 */
  42
  43 #ifndef __YARROW_COMP_H__
  44 #define __YARROW_COMP_H__
  45
  46 #include "smf.h"
  47
  48 /*
  49  * Kernel version does NULL compression....
  50  */
  51 #define YARROW_KERNEL
  52
  53 #ifdef  YARROW_KERNEL
  54 /*
  55  * Shrink this down to almost nothing to simplify kernel port;
  56  * with additional hacking on prng.c, this could go away entirely
  57  */
  58 typedef char COMP_CTX;
  59
  60 /* and define some type3s normally picked up from zlib */
  61 typedef unsigned char Bytef;
  62 typedef unsigned uInt;
  63
  64 #else
  65
  66 #include "zlib.h"
  67
  68 /* Top level compression context */
  69 typedef struct{
  70         MMPTR buf;
  71         uInt spaceused;
  72 } COMP_CTX;
  73 #endif  /* YARROW_KERNEL */
  74
  75 typedef enum comp_error_status {
  76         COMP_SUCCESS = 0,
  77         COMP_ERR_NULL_POINTER,
  78         COMP_ERR_LOW_MEMORY,
  79         COMP_ERR_LIB
  80 } comp_error_status;
  81
  82 /* Exported functions from compress.c */
  83 comp_error_status comp_init(COMP_CTX* ctx);
  84 comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
  85 comp_error_status comp_end(COMP_CTX* ctx);
  86 comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
  87
  88 #endif