OpenVDB: nanovdb/util/GridValidator.h Source File

OpenVDB 10.0.1

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GridValidator.h
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1// Copyright Contributors to the OpenVDB Project
2// SPDX-License-Identifier: MPL-2.0
3
4/*!
5 \file GridValidator.h
6
7 \author Ken Museth
8
9 \date August 30, 2020
10
11 \brief Checks the validity of an existing NanoVDB grid.
12*/
13
14#ifndef NANOVDB_GRIDVALIDATOR_H_HAS_BEEN_INCLUDED
15#define NANOVDB_GRIDVALIDATOR_H_HAS_BEEN_INCLUDED
16
17#include "../NanoVDB.h"
18#include "GridChecksum.h"
19
20namespace nanovdb {
21
22/// @brief Return true if the specified grid passes several validation tests.
23///
24/// @param grid Grid to validate
25/// @param detailed If true the validation test is detailed and relatively slow.
26/// @param verbose If true information about the first failed test is printed to std::cerr
27template <typename ValueT>
28bool isValid(const NanoGrid<ValueT> &grid, bool detailed = true, bool verbose = false);
29
30/// @brief Allows for the construction of NanoVDB grids without any dependecy
31template <typename ValueT>
32 class GridValidator
33{
34 using GridT = NanoGrid<ValueT>;
35 inline static void checkTree( const GridT&, std::string&, bool);
36 inline static void checkRoot( const GridT&, std::string&, bool);
37 inline static void checkNodes(const GridT&, std::string&);
38
39public:
40 /// @brief Returns an error message (an empty string means no error)
41 ///
42 /// @param grid NanoVDB grid to be tested
43 /// @param detailed If true the checksum is computed and validated as well as all the node pointers
44 ///
45 /// @note The validation is much slower if @c detailed == true!
46 static std::string check(const GridT &grid, bool detailed = true);
47
48};// GridValidator
49
50//================================================================================================
51
52template <typename ValueT>
53std::string GridValidator<ValueT>::check(const GridT &grid, bool detailed)
54{
55 std::string errorStr;
56
57 // First check the Grid
58 auto *data = reinterpret_cast<const typename GridT::DataType*>(&grid);
59 std::stringstream ss;
60 if (!isValid(data)) {
61 errorStr.assign("Grid is not 32B aligned");
62 } else if (data->mMagic != NANOVDB_MAGIC_NUMBER) {
63 ss << "Incorrect magic number: Expected " << NANOVDB_MAGIC_NUMBER << ", but read " << data->mMagic;
64 errorStr = ss.str();
65 } else if (!validateChecksum(grid, detailed ? ChecksumMode::Full : ChecksumMode::Partial)) {
66 errorStr.assign("Mis-matching checksum");
67 } else if (data->mVersion >= Version(29,0,0) && data->mVersion.getMajor() != NANOVDB_MAJOR_VERSION_NUMBER) {
68 ss << "Invalid major version number: Expected " << NANOVDB_MAJOR_VERSION_NUMBER << ", but read " << data->mVersion.c_str();
69 errorStr = ss.str();
70 } else if (data->mVersion < Version(29,0,0) && data->mVersion.id() != 28u) {
71 ss << "Invalid old major version number: Expected 28 or newer, but read " << data->mVersion.id();
72 errorStr = ss.str();
73 } else if (data->mGridClass >= GridClass::End) {
74 errorStr.assign("Invalid GridClass");
75 } else if (data->mGridType >= GridType::End) {
76 errorStr.assign("Invalid GridType");
77 } else if (data->mGridType != mapToGridType<ValueT>()) {
78 errorStr.assign("Invalid combination of ValueType and GridType");
79 } else if (!isValid(data->mGridType, data->mGridClass)) {
80 errorStr.assign("Invalid combination of GridType and GridClass");
81 } else if ( (const uint8_t*)(&(grid.tree())) != (const uint8_t*)(&grid+1) ) {
82 errorStr.assign("Invalid Tree pointer");
83 } else {
84 checkTree(grid, errorStr, detailed);
85 }
86 return errorStr;
87}
88
89//================================================================================================
90
91template<typename ValueT>
92void GridValidator<ValueT>::checkTree(const GridT &grid, std::string &errorStr, bool detailed)
93{
94 if (!isValid(&grid.tree())) {
95 errorStr.assign("Tree is not 32B aligned");
96 } else if ( (const uint8_t*)(&grid.tree().root()) < (const uint8_t*)(&grid.tree()+1)) {
97 errorStr.assign("Invalid root pointer (should be located after the Grid and Tree)");
98 } else if ( (const uint8_t*)(&grid.tree().root()) > (const uint8_t*)(&grid) + grid.gridSize() - sizeof(grid.tree().root()) ) {
99 errorStr.assign("Invalid root pointer (appears to be located after the end of the buffer)");
100 } else {
101 checkRoot(grid, errorStr, detailed);
102 }
103}// GridValidator::checkTree
104
105//================================================================================================
106
107template<typename ValueT>
108void GridValidator<ValueT>::checkRoot(const GridT &grid, std::string &errorStr, bool detailed)
109{
110 auto &root = grid.tree().root();
111 auto *data = root.data();
112 if (!isValid(data)) {
113 errorStr.assign("Root is not 32B aligned");
114 }
115 const uint8_t *minPtr = (const uint8_t*)(&root + 1);
116 const uint8_t *maxPtr = (const uint8_t*)(&root) + root.memUsage();
117 for (uint32_t i = 0; errorStr.empty() && i<data->mTableSize; ++i) {
118 const auto *tile = data->tile(i);
119 if ( (const uint8_t *) tile < minPtr ) {
120 errorStr.assign("Invalid root tile pointer (below lower bound");
121 } else if ( (const uint8_t *) tile > maxPtr - sizeof(*tile) ) {
122 errorStr.assign("Invalid root tile pointer (above higher bound");
123 }
124 }
125 if (detailed && errorStr.empty()) {
126 checkNodes(grid, errorStr);
127 }
128}// GridValidator::processRoot
129
130//================================================================================================
131template<typename ValueT>
132void GridValidator<ValueT>::checkNodes(const GridT &grid, std::string &errorStr)
133{
134 auto &root = grid.tree().root();// note, the root node was already checked
135 const uint8_t *minPtr = (const uint8_t*)(&root) + root.memUsage();
136 const uint8_t *maxPtr = (const uint8_t*)(&grid) + grid.gridSize();
137
138 auto check = [&](const void * ptr, size_t ptrSize) -> bool {
139 if (!isValid(ptr)) {
140 errorStr.assign("Invalid node pointer: not 32B aligned");
141 } else if ( (const uint8_t *) ptr < minPtr ) {
142 errorStr.assign("Invalid node pointer: below lower bound");
143 } else if ( (const uint8_t *) ptr > maxPtr - ptrSize ) {
144 errorStr.assign("Invalid node pointer: above higher bound");
145 }
146 return errorStr.empty();
147 };
148
149 for (auto it2 = grid.tree().root().beginChild(); it2; ++it2) {
150 auto &node2 = *it2;
151 if (!check(&node2, sizeof(node2))) return;
152 for (auto it1 = node2.beginChild(); it1; ++it1) {
153 auto &node1 = *it1;
154 if (!check(&node1, sizeof(node1))) return;
155 for (auto it0 = node1.beginChild(); it0; ++it0) {
156 auto &node0 = *it0;
157 if (!check(&node2, sizeof(node2))) return;
158 }// loop over child nodes of the lower internal node
159 }// loop over child nodes of the upper internal node
160 }// loop over child nodes of the root node
161
162} // GridValidator::processNodes
163
164
165//================================================================================================
166
167template <typename ValueT>
168 bool isValid(const NanoGrid<ValueT> &grid, bool detailed, bool verbose)
169{
170 const std::string str = GridValidator<ValueT>::check( grid, detailed );
171 if (verbose && !str.empty()) std::cerr << "Validation failed: " << str << std::endl;
172 return str.empty();
173}
174
175} // namespace nanovdb
176
177#endif // NANOVDB_GRIDVALIDATOR_H_HAS_BEEN_INCLUDED
GridChecksum.h
Computes a pair of 32bit checksums, og a Grid, by means of Cyclic Redundancy Check (CRC)
NANOVDB_MAJOR_VERSION_NUMBER
#define NANOVDB_MAJOR_VERSION_NUMBER
Definition NanoVDB.h:123
NANOVDB_MAGIC_NUMBER
#define NANOVDB_MAGIC_NUMBER
Definition NanoVDB.h:121
nanovdb::DenseGridHandle
Definition DenseGrid.h:402
nanovdb::DenseGridHandle::DenseGridHandle
DenseGridHandle()=default
nanovdb::DenseGridHandle::data
uint8_t * data()
Returns a non-const pointer to the data.
Definition DenseGrid.h:432
nanovdb::DenseGridHandle::grid
const DenseGrid< ValueT > * grid() const
Returns a const pointer to the NanoVDB grid encoded in the DenseGridHandle.
Definition DenseGrid.h:447
nanovdb::GridValidator
Allows for the construction of NanoVDB grids without any dependecy.
Definition GridValidator.h:33
nanovdb::GridValidator::check
static std::string check(const GridT &grid, bool detailed=true)
Returns an error message (an empty string means no error)
Definition GridValidator.h:53
nanovdb::Grid
Highest level of the data structure. Contains a tree and a world->index transform (that currently onl...
Definition NanoVDB.h:2556
nanovdb::Version
Bit-compacted representation of all three version numbers.
Definition NanoVDB.h:648
nanovdb
Definition NanoVDB.h:208
nanovdb::GridClass::End
@ End
nanovdb::GridType::End
@ End
nanovdb::validateChecksum
bool validateChecksum(const NanoGrid< ValueT > &grid, ChecksumMode mode=ChecksumMode::Default)
Return true if the checksum of the grid matches the expected value already encoded into the grid's me...
Definition GridChecksum.h:269
nanovdb::ChecksumMode::Partial
@ Partial
nanovdb::ChecksumMode::Full
@ Full
nanovdb::isValid
static bool isValid(const void *p)
return true if the specified pointer is aligned and not NULL
Definition NanoVDB.h:504
nanovdb::GridData
Struct with all the member data of the Grid (useful during serialization of an openvdb grid)
Definition NanoVDB.h:2432