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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 /*
  24         File:           comp.h
  25
  26         Contains:       Glue between core prng code to the Zlib library.
  27
  28         Written by:     Counterpane, Inc.
  29
  30         Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
  31
  32         Change History (most recent first):
  33
  34                 02/10/99        dpm             Created, based on Counterpane source.
  35
  36 */
  37 /* comp.h
  38
  39    Header for the compression routines added to the Counterpane PRNG.
  40 */
  41
  42 #ifndef __YARROW_COMP_H__
  43 #define __YARROW_COMP_H__
  44
  45 #include "smf.h"
  46
  47 /*
  48  * Kernel version does NULL compression....
  49  */
  50 #define YARROW_KERNEL
  51
  52 #ifdef  YARROW_KERNEL
  53 /*
  54  * Shrink this down to almost nothing to simplify kernel port;
  55  * with additional hacking on prng.c, this could go away entirely
  56  */
  57 typedef char COMP_CTX;
  58
  59 /* and define some type3s normally picked up from zlib */
  60 typedef unsigned char Bytef;
  61 typedef unsigned uInt;
  62
  63 #else
  64
  65 #include "zlib.h"
  66
  67 /* Top level compression context */
  68 typedef struct{
  69         MMPTR buf;
  70         uInt spaceused;
  71 } COMP_CTX;
  72 #endif  /* YARROW_KERNEL */
  73
  74 typedef enum comp_error_status {
  75         COMP_SUCCESS = 0,
  76         COMP_ERR_NULL_POINTER,
  77         COMP_ERR_LOW_MEMORY,
  78         COMP_ERR_LIB
  79 } comp_error_status;
  80
  81 /* Exported functions from compress.c */
  82 comp_error_status comp_init(COMP_CTX* ctx);
  83 comp_error_status comp_add_data(COMP_CTX* ctx,Bytef* inp,uInt inplen);
  84 comp_error_status comp_end(COMP_CTX* ctx);
  85 comp_error_status comp_get_ratio(COMP_CTX* ctx,float* out);
  86
  87 #endif