fnv1a.h revision 362181 
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
32extern "C" {
33#endif /* __cplusplus */
34
35/* Opaque FNV-1a checksum creation context type.
36 */
37typedef 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 */
41svn_fnv1a_32__context_t *
42svn_fnv1a_32__context_create(apr_pool_t *pool);
43
44/* Reset the FNV-1a checksum CONTEXT to initial state.
45 */
46void
47svn_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 */
51void
52svn_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 */
58apr_uint32_t
59svn_fnv1a_32__finalize(svn_fnv1a_32__context_t *context);
60
61
62/* Opaque modified FNV-1a checksum creation context type.
63 */
64typedef 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 */
68svn_fnv1a_32x4__context_t *
69svn_fnv1a_32x4__context_create(apr_pool_t *pool);
70
71/* Reset the modified FNV-1a checksum CONTEXT to initial state.
72 */
73void
74svn_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 */
79void
80svn_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 */
86apr_uint32_t
87svn_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 */
92void
93svn__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