OpenVDB: openvdb/io/File.h Source File

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File.h
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1// Copyright Contributors to the OpenVDB Project
2// SPDX-License-Identifier: Apache-2.0
3//
4/// @file File.h
5
6#ifndef OPENVDB_IO_FILE_HAS_BEEN_INCLUDED
7#define OPENVDB_IO_FILE_HAS_BEEN_INCLUDED
8
9#include <openvdb/version.h>
10#include "io.h" // for MappedFile::Notifier
11#include "Archive.h"
12#include "GridDescriptor.h"
13#include <algorithm> // for std::copy()
14#include <iosfwd>
15#include <iterator> // for std::back_inserter()
16#include <map>
17#include <memory>
18#include <string>
19
20
21class TestFile;
22class TestStream;
23
24namespace openvdb {
25 OPENVDB_USE_VERSION_NAMESPACE
26namespace OPENVDB_VERSION_NAME {
27namespace io {
28
29/// Grid archive associated with a file on disk
30 class OPENVDB_API File: public Archive
31{
32public:
33 using NameMap = std::multimap<Name, GridDescriptor>;
34 using NameMapCIter = NameMap::const_iterator;
35
36 explicit File(const std::string& filename);
37 ~File() override;
38
39 /// @brief Copy constructor
40 /// @details The copy will be closed and will not reference the same
41 /// file descriptor as the original.
42 File(const File& other);
43 /// @brief Assignment
44 /// @details After assignment, this File will be closed and will not
45 /// reference the same file descriptor as the source File.
46 File& operator=(const File& other);
47
48 /// @brief Return a copy of this archive.
49 /// @details The copy will be closed and will not reference the same
50 /// file descriptor as the original.
51 SharedPtr<Archive> copy() const override;
52
53 /// @brief Return the name of the file with which this archive is associated.
54 /// @details The file does not necessarily exist on disk yet.
55 const std::string& filename() const;
56
57#ifdef OPENVDB_USE_DELAYED_LOADING
58 /// @brief Open the file, read the file header and the file-level metadata,
59 /// and populate the grid descriptors, but do not load any grids into memory.
60 /// @details If @a delayLoad is true, map the file into memory and enable delayed loading
61 /// of grids, and if a notifier is provided, call it when the file gets unmapped.
62 /// @note Define the environment variable @c OPENVDB_DISABLE_DELAYED_LOAD to disable
63 /// delayed loading unconditionally.
64 /// @throw IoError if the file is not a valid VDB file.
65 /// @return @c true if the file's UUID has changed since it was last read.
66 /// @see setCopyMaxBytes
67 bool open(bool delayLoad = true, const MappedFile::Notifier& = MappedFile::Notifier());
68#else
69 bool open(bool /*delayLoad*/ = false);
70#endif
71
72 /// Return @c true if the file has been opened for reading.
73 bool isOpen() const;
74
75 /// Close the file once we are done reading from it.
76 void close();
77
78 /// @brief Return this file's current size on disk in bytes.
79 /// @throw IoError if the file size cannot be determined.
80 Index64 getSize() const;
81
82#ifdef OPENVDB_USE_DELAYED_LOADING
83 /// @brief Return the size in bytes above which this file will not be
84 /// automatically copied during delayed loading.
85 Index64 copyMaxBytes() const;
86 /// @brief If this file is opened with delayed loading enabled, make a private copy
87 /// of the file if its size in bytes is less than the specified value.
88 /// @details Making a private copy ensures that the file can't change on disk
89 /// before it has been fully read.
90 /// @warning If the file is larger than this size, it is the user's responsibility
91 /// to ensure that it does not change on disk before it has been fully read.
92 /// Undefined behavior and/or a crash might result otherwise.
93 /// @note Copying is enabled by default, but it can be disabled for individual files
94 /// by setting the maximum size to zero bytes. A default size limit can be specified
95 /// by setting the environment variable @c OPENVDB_DELAYED_LOAD_COPY_MAX_BYTES
96 /// to the desired number of bytes.
97 void setCopyMaxBytes(Index64 bytes);
98#endif
99
100 /// Return @c true if a grid of the given name exists in this file.
101 bool hasGrid(const Name&) const;
102
103 /// Return (in a newly created MetaMap) the file-level metadata.
104 MetaMap::Ptr getMetadata() const;
105
106 /// Read the entire contents of the file and return a list of grid pointers.
107 GridPtrVecPtr getGrids() const;
108
109 /// @brief Read just the grid metadata and transforms from the file and return a list
110 /// of pointers to grids that are empty except for their metadata and transforms.
111 /// @throw IoError if this file is not open for reading.
112 GridPtrVecPtr readAllGridMetadata();
113
114 /// @brief Read a grid's metadata and transform only.
115 /// @return A pointer to a grid that is empty except for its metadata and transform.
116 /// @throw IoError if this file is not open for reading.
117 /// @throw KeyError if no grid with the given name exists in this file.
118 GridBase::Ptr readGridMetadata(const Name&);
119
120 /// Read an entire grid, including all of its data blocks.
121 GridBase::Ptr readGrid(const Name&);
122 /// @brief Read a grid, including its data blocks, but only where it
123 /// intersects the given world-space bounding box.
124 GridBase::Ptr readGrid(const Name&, const BBoxd&);
125
126 /// @todo GridPtrVec readAllGrids(const Name&)
127
128 /// @brief Write the grids in the given container to the file whose name
129 /// was given in the constructor.
130 void write(const GridCPtrVec&, const MetaMap& = MetaMap()) const override;
131
132 /// @brief Write the grids in the given container to the file whose name
133 /// was given in the constructor.
134 template<typename GridPtrContainerT>
135 void write(const GridPtrContainerT&, const MetaMap& = MetaMap()) const;
136
137 /// A const iterator that iterates over all names in the file. This is only
138 /// valid once the file has been opened.
139 class OPENVDB_API NameIterator
140 {
141 public:
142 NameIterator(const NameMapCIter& iter): mIter(iter) {}
143 NameIterator(const NameIterator&) = default;
144 ~NameIterator() {}
145
146 NameIterator& operator++() { mIter++; return *this; }
147
148 bool operator==(const NameIterator& iter) const { return mIter == iter.mIter; }
149 bool operator!=(const NameIterator& iter) const { return mIter != iter.mIter; }
150
151 Name operator*() const { return this->gridName(); }
152
153 Name gridName() const { return GridDescriptor::nameAsString(mIter->second.uniqueName()); }
154
155 private:
156 NameMapCIter mIter;
157 };
158
159 /// @return a NameIterator to iterate over all grid names in the file.
160 NameIterator beginName() const;
161
162 /// @return the ending iterator for all grid names in the file.
163 NameIterator endName() const;
164
165private:
166 /// Read in all grid descriptors that are stored in the given stream.
167 void readGridDescriptors(std::istream&);
168
169 /// @brief Return an iterator to the descriptor for the grid with the given name.
170 /// If the name is non-unique, return an iterator to the first matching descriptor.
171 NameMapCIter findDescriptor(const Name&) const;
172
173 /// Return a newly created, empty grid of the type specified by the given grid descriptor.
174 GridBase::Ptr createGrid(const GridDescriptor&) const;
175
176 /// @brief Read a grid, including its data blocks, but only where it
177 /// intersects the given world-space bounding box.
178 GridBase::Ptr readGridByName(const Name&, const BBoxd&);
179
180 /// Read in and return the partially-populated grid specified by the given grid descriptor.
181 GridBase::ConstPtr readGridPartial(const GridDescriptor&, bool readTopology) const;
182
183 /// Read in and return the grid specified by the given grid descriptor.
184 GridBase::Ptr readGrid(const GridDescriptor&) const;
185 /// Read in and return the region of the grid specified by the given grid descriptor
186 /// that intersects the given world-space bounding box.
187 GridBase::Ptr readGrid(const GridDescriptor&, const BBoxd&) const;
188 /// Read in and return the region of the grid specified by the given grid descriptor
189 /// that intersects the given index-space bounding box.
190 GridBase::Ptr readGrid(const GridDescriptor&, const CoordBBox&) const;
191
192 /// @brief Partially populate the given grid by reading its metadata and transform and,
193 /// if the grid is not an instance, its tree structure, but not the tree's leaf nodes.
194 void readGridPartial(GridBase::Ptr, std::istream&, bool isInstance, bool readTopology) const;
195
196 /// @brief Retrieve a grid from @c mNamedGrids. Return a null pointer
197 /// if @c mNamedGrids was not populated (because this file is random-access).
198 /// @throw KeyError if no grid with the given name exists in this file.
199 GridBase::Ptr retrieveCachedGrid(const Name&) const;
200
201 void writeGrids(const GridCPtrVec&, const MetaMap&) const;
202
203 MetaMap::Ptr fileMetadata();
204 MetaMap::ConstPtr fileMetadata() const;
205
206 const NameMap& gridDescriptors() const;
207 NameMap& gridDescriptors();
208
209 std::istream& inputStream() const;
210
211 friend class ::TestFile;
212 friend class ::TestStream;
213
214 struct Impl;
215 std::unique_ptr<Impl> mImpl;
216};
217
218
219////////////////////////////////////////
220
221
222inline void
223File::write(const GridCPtrVec& grids, const MetaMap& meta) const
224{
225 this->writeGrids(grids, meta);
226}
227
228
229template<typename GridPtrContainerT>
230inline void
231 File::write(const GridPtrContainerT& container, const MetaMap& meta) const
232{
233 GridCPtrVec grids;
234 std::copy(container.begin(), container.end(), std::back_inserter(grids));
235 this->writeGrids(grids, meta);
236}
237
238} // namespace io
239} // namespace OPENVDB_VERSION_NAME
240} // namespace openvdb
241
242#endif // OPENVDB_IO_FILE_HAS_BEEN_INCLUDED
Archive.h
GridDescriptor.h
OPENVDB_API
#define OPENVDB_API
Definition Platform.h:268
openvdb::v12_0::GridBase::ConstPtr
SharedPtr< const GridBase > ConstPtr
Definition Grid.h:81
openvdb::v12_0::GridBase::Ptr
SharedPtr< GridBase > Ptr
Definition Grid.h:80
openvdb::v12_0::MetaMap
Container that maps names (strings) to values of arbitrary types.
Definition MetaMap.h:20
openvdb::v12_0::MetaMap::ConstPtr
SharedPtr< const MetaMap > ConstPtr
Definition MetaMap.h:23
openvdb::v12_0::MetaMap::Ptr
SharedPtr< MetaMap > Ptr
Definition MetaMap.h:22
openvdb::v12_0::io::Archive::Archive
Archive()
openvdb::v12_0::io::File::NameIterator
Definition File.h:140
openvdb::v12_0::io::File::NameIterator::NameIterator
NameIterator(const NameIterator &)=default
openvdb::v12_0::io::File::NameIterator::~NameIterator
~NameIterator()
Definition File.h:144
openvdb::v12_0::io::File::NameIterator::operator*
Name operator*() const
Definition File.h:151
openvdb::v12_0::io::File::NameIterator::gridName
Name gridName() const
Definition File.h:153
openvdb::v12_0::io::File::NameIterator::operator!=
bool operator!=(const NameIterator &iter) const
Definition File.h:149
openvdb::v12_0::io::File::NameIterator::NameIterator
NameIterator(const NameMapCIter &iter)
Definition File.h:142
openvdb::v12_0::io::File::NameIterator::operator++
NameIterator & operator++()
Definition File.h:146
openvdb::v12_0::io::File::NameIterator::operator==
bool operator==(const NameIterator &iter) const
Definition File.h:148
openvdb::v12_0::io::File::isOpen
bool isOpen() const
Return true if the file has been opened for reading.
openvdb::v12_0::io::File::endName
NameIterator endName() const
openvdb::v12_0::io::File::getGrids
GridPtrVecPtr getGrids() const
Read the entire contents of the file and return a list of grid pointers.
openvdb::v12_0::io::File::write
void write(const GridCPtrVec &, const MetaMap &=MetaMap()) const override
Write the grids in the given container to the file whose name was given in the constructor.
Definition File.h:223
openvdb::v12_0::io::File::hasGrid
bool hasGrid(const Name &) const
Return true if a grid of the given name exists in this file.
openvdb::v12_0::io::File::File
File(const std::string &filename)
openvdb::v12_0::io::File::filename
const std::string & filename() const
Return the name of the file with which this archive is associated.
openvdb::v12_0::io::File::readGrid
GridBase::Ptr readGrid(const Name &, const BBoxd &)
Read a grid, including its data blocks, but only where it intersects the given world-space bounding b...
openvdb::v12_0::io::File::close
void close()
Close the file once we are done reading from it.
openvdb::v12_0::io::File::open
bool open(bool=false)
openvdb::v12_0::io::File::NameMapCIter
NameMap::const_iterator NameMapCIter
Definition File.h:34
openvdb::v12_0::io::File::~File
~File() override
openvdb::v12_0::io::File::beginName
NameIterator beginName() const
openvdb::v12_0::io::File::readGrid
GridBase::Ptr readGrid(const Name &)
Read an entire grid, including all of its data blocks.
openvdb::v12_0::io::File::File
File(const File &other)
Copy constructor.
openvdb::v12_0::io::File::operator=
File & operator=(const File &other)
Assignment.
openvdb::v12_0::io::File::getMetadata
MetaMap::Ptr getMetadata() const
Return (in a newly created MetaMap) the file-level metadata.
openvdb::v12_0::io::File::readGridMetadata
GridBase::Ptr readGridMetadata(const Name &)
Read a grid's metadata and transform only.
openvdb::v12_0::io::File::copy
SharedPtr< Archive > copy() const override
Return a copy of this archive.
openvdb::v12_0::io::File::readAllGridMetadata
GridPtrVecPtr readAllGridMetadata()
Read just the grid metadata and transforms from the file and return a list of pointers to grids that ...
openvdb::v12_0::io::File::getSize
Index64 getSize() const
Return this file's current size on disk in bytes.
openvdb::v12_0::io::File::NameMap
std::multimap< Name, GridDescriptor > NameMap
Definition File.h:33
openvdb::v12_0::io::GridDescriptor
Definition GridDescriptor.h:20
openvdb::v12_0::io::GridDescriptor::nameAsString
static std::string nameAsString(const Name &)
Given a name with suffix N, return "name[N]", otherwise just return "name". Use this to produce a hum...
openvdb::v12_0::math::CoordBBox
Axis-aligned bounding box of signed integer coordinates.
Definition Coord.h:252
io.h
openvdb::v12_0::Name
std::string Name
Definition Name.h:19
openvdb::v12_0::GridPtrVecPtr
SharedPtr< GridPtrVec > GridPtrVecPtr
Definition Grid.h:511
openvdb::v12_0::BBoxd
math::BBox< Vec3d > BBoxd
Definition Types.h:84
openvdb::v12_0::Index64
uint64_t Index64
Definition Types.h:53
openvdb::v12_0::SharedPtr
std::shared_ptr< T > SharedPtr
Definition Types.h:114
openvdb::v12_0::GridCPtrVec
std::vector< GridBase::ConstPtr > GridCPtrVec
Definition Grid.h:513
openvdb
Definition Exceptions.h:13
OPENVDB_VERSION_NAME
#define OPENVDB_VERSION_NAME
The version namespace name for this library version.
Definition version.h.in:121
OPENVDB_USE_VERSION_NAMESPACE
#define OPENVDB_USE_VERSION_NAMESPACE
Definition version.h.in:218