Alembic: Util/Digest.h Source File

Alembic 1.8.11

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Digest.h
1//-*****************************************************************************
2//
3// Copyright (c) 2009-2012,
4// Sony Pictures Imageworks Inc. and
5// Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
6//
7// All rights reserved.
8//
9// Redistribution and use in source and binary forms, with or without
10// modification, are permitted provided that the following conditions are
11// met:
12// * Redistributions of source code must retain the above copyright
13// notice, this list of conditions and the following disclaimer.
14// * Redistributions in binary form must reproduce the above
15// copyright notice, this list of conditions and the following disclaimer
16// in the documentation and/or other materials provided with the
17// distribution.
18// * Neither the name of Sony Pictures Imageworks, nor
19// Industrial Light & Magic, nor the names of their contributors may be used
20// to endorse or promote products derived from this software without specific
21// prior written permission.
22//
23// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34//
35//-*****************************************************************************
36
37#ifndef Alembic_Util_Digest_h
38#define Alembic_Util_Digest_h
39
40#include <Alembic/Util/Foundation.h>
41#include <Alembic/Util/PlainOldDataType.h>
42
43namespace Alembic {
44namespace Util {
45namespace ALEMBIC_VERSION_NS {
46
47//-*************************************************************************
48// Digest class. This is a 128 bit hash key produced by our hashing algorithm.
49// It is totally ordered, by way of the totally_ordered operator template.
50 struct Digest : public Alembic::Util::totally_ordered<Digest>
51{
52 union
53 {
54 uint8_t d[16];
55 uint64_t words[2];
56 };
57
58 Digest() { words[0] = words[1] = 0; }
59 Digest( const Digest &copy )
60 {
61 words[0] = copy.words[0];
62 words[1] = copy.words[1];
63 }
64
65 Digest &operator=( const Digest &copy )
66 {
67 words[0] = copy.words[0];
68 words[1] = copy.words[1];
69 return *this;
70 }
71
72 uint8_t& operator[]( size_t i ) { return d[i]; }
73 uint8_t operator[]( size_t i ) const { return d[i]; }
74
75 void print( std::ostream &ostr ) const
76 {
77 for ( int i = 0; i < 16; ++i )
78 {
79 ostr << std::setfill( '0' ) << std::setw( 2 ) <<
80 std::hex << std::noshowbase << ( int ) d[i];
81 }
82 }
83
84 std::string str() const
85 {
86 std::stringstream sstr;
87 print( sstr );
88 return sstr.str();
89 }
90
91 //-*************************************************************************
92 // ORDERING AND COMPARISON OPERATORS
93 //-*************************************************************************
94 bool operator==( const Digest &iRhs ) const
95 {
96 return ( ( words[0] == iRhs.words[0] ) &&
97 ( words[1] == iRhs.words[1] ) );
98 }
99
100 bool operator<( const Digest &iRhs ) const
101 {
102 return ( words[0] < iRhs.words[0] ? true :
103 ( words[0] > iRhs.words[0] ? false :
104 ( words[1] < iRhs.words[1] ) ) );
105 }
106};
107
108//-*****************************************************************************
109inline std::ostream &operator<<( std::ostream &ostr, const Digest &a )
110{
111 a.print( ostr );
112 return ostr;
113}
114
115} // End namespace ALEMBIC_VERSION_NS
116
117using namespace ALEMBIC_VERSION_NS;
118
119} // End namespace Util
120} // End namespace Alembic
121
122#endif
Alembic::Util::ALEMBIC_VERSION_NS::totally_ordered
Definition Foundation.h:120
Alembic
Alembic namespace ...
Definition ArchiveInfo.cpp:39
Alembic::Util::ALEMBIC_VERSION_NS::Digest
Definition Digest.h:51