1 /*
2  * fnv1a.h :  routines to create checksums derived from FNV-1a
3  *
4  * ====================================================================
5  *    Licensed to the Apache Software Foundation (ASF) under one
6  *    or more contributor license agreements.  See the NOTICE file
7  *    distributed with this work for additional information
8  *    regarding copyright ownership.  The ASF licenses this file
9  *    to you under the Apache License, Version 2.0 (the
10  *    "License"); you may not use this file except in compliance
11  *    with the License.  You may obtain a copy of the License at
12  *
13  *      http://www.apache.org/licenses/LICENSE-2.0
14  *
15  *    Unless required by applicable law or agreed to in writing,
16  *    software distributed under the License is distributed on an
17  *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18  *    KIND, either express or implied.  See the License for the
19  *    specific language governing permissions and limitations
20  *    under the License.
21  * ====================================================================
22  */
23 
24 #ifndef SVN_LIBSVN_SUBR_FNV1A_H
25 #define SVN_LIBSVN_SUBR_FNV1A_H
26 
27 #include <apr_pools.h>
28 
29 #include "svn_types.h"
30 
31 #ifdef __cplusplus
32 extern "C" {
33 #endif /* __cplusplus */
34 
35 /* Opaque FNV-1a checksum creation context type.
36  */
37 typedef struct svn_fnv1a_32__context_t svn_fnv1a_32__context_t;
38 
39 /* Return a new FNV-1a checksum creation context allocated in POOL.
40  */
41 svn_fnv1a_32__context_t *
42 svn_fnv1a_32__context_create(apr_pool_t *pool);
43 
44 /* Reset the FNV-1a checksum CONTEXT to initial state.
45  */
46 void
47 svn_fnv1a_32__context_reset(svn_fnv1a_32__context_t *context);
48 
49 /* Feed LEN bytes from DATA into the FNV-1a checksum creation CONTEXT.
50  */
51 void
52 svn_fnv1a_32__update(svn_fnv1a_32__context_t *context,
53                      const void *data,
54                      apr_size_t len);
55 
56 /* Return the FNV-1a checksum over all data fed into  CONTEXT.
57  */
58 apr_uint32_t
59 svn_fnv1a_32__finalize(svn_fnv1a_32__context_t *context);
60 
61 
62 /* Opaque modified FNV-1a checksum creation context type.
63  */
64 typedef struct svn_fnv1a_32x4__context_t svn_fnv1a_32x4__context_t;
65 
66 /* Return a new modified FNV-1a checksum creation context allocated in POOL.
67  */
68 svn_fnv1a_32x4__context_t *
69 svn_fnv1a_32x4__context_create(apr_pool_t *pool);
70 
71 /* Reset the modified FNV-1a checksum CONTEXT to initial state.
72  */
73 void
74 svn_fnv1a_32x4__context_reset(svn_fnv1a_32x4__context_t *context);
75 
76 /* Feed LEN bytes from DATA into the modified FNV-1a checksum creation
77  * CONTEXT.
78  */
79 void
80 svn_fnv1a_32x4__update(svn_fnv1a_32x4__context_t *context,
81                        const void *data,
82                        apr_size_t len);
83 
84 /* Return the modified FNV-1a checksum over all data fed into  CONTEXT.
85  */
86 apr_uint32_t
87 svn_fnv1a_32x4__finalize(svn_fnv1a_32x4__context_t *context);
88 
89 /* Set HASHES to the 4 partial hash sums produced by the modified FVN-1a
90  * over INPUT of LEN bytes.
91  */
92 void
93 svn__fnv1a_32x4_raw(apr_uint32_t hashes[4],
94                     const void *input,
95                     apr_size_t len);
96 
97 #ifdef __cplusplus
98 }
99 #endif /* __cplusplus */
100 
101 #endif /* SVN_LIBSVN_SUBR_FNV1A_H */
102