OpenVDB  9.1.1
Classes | Namespaces | Enumerations | Functions
GridChecksum.h File Reference

Computes a pair of 32bit checksums, og a Grid, by means of Cyclic Redundancy Check (CRC) More...

#include <algorithm>
#include <array>
#include <vector>
#include <cstdint>
#include <cstddef>
#include <numeric>
#include <type_traits>
#include "../NanoVDB.h"
#include "GridHandle.h"
#include "ForEach.h"
#include "NodeManager.h"

Go to the source code of this file.

Classes

class  CRC32
 Class that computes the Cyclic Redundancy Check (CRC) More...
 
class  GridChecksum
 Class that encapsulates two CRC32 checksums, one for the Grid, Tree and Root node meta data and one for the remaining grid nodes. More...
 

Namespaces

 nanovdb
 

Enumerations

enum  ChecksumMode : uint32_t {
  Disable = 0, Partial = 1, Full = 2, Default = 1,
  End = 3
}
 List of different modes for computing for a checksum. More...
 

Functions

template<typename ValueT >
uint64_t checksum (const NanoGrid< ValueT > &grid, ChecksumMode mode=ChecksumMode::Default)
 Return the (2 x CRC32) checksum of the specified grid. More...
 
template<typename ValueT >
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 meta data. More...
 
template<typename ValueT >
void updateChecksum (NanoGrid< ValueT > &grid, ChecksumMode mode=ChecksumMode::Default)
 Updates the checksum of a grid. More...
 
std::uint_fast32_t crc32 (const void *data, size_t size)
 Return the CRC32 checksum of the raw data of size. More...
 
template<typename IterT >
std::uint_fast32_t crc32 (IterT begin, IterT end)
 Return the CRC32 checksum of the content pointed to be the iterator. More...
 

Detailed Description

Computes a pair of 32bit checksums, og a Grid, by means of Cyclic Redundancy Check (CRC)

Author
Ken Museth

A CRC32 is the 32 bit remainder, or residue, of binary division of a message, by a polynomial.