GridChecksum.h File Reference

Computes a pair of 32bit checksums, of 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 <memory>
#include <nanovdb/NanoVDB.h>
#include "ForEach.h"
#include "NodeManager.h"

Go to the source code of this file.

Classes
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
	nanovdb::crc32

Macros
#define	NANOVDB_CRC32_LOG2_BLOCK_SIZE   12

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 BuildT >
uint64_t	checksum (const NanoGrid< BuildT > &grid, ChecksumMode mode=ChecksumMode::Default)
	Return the (2 x CRC32) checksum of the specified grid. More...
template<typename BuildT >
bool	validateChecksum (const NanoGrid< BuildT > &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 BuildT >
void	updateChecksum (NanoGrid< BuildT > &grid, ChecksumMode mode=ChecksumMode::Default)
	Updates the checksum of a grid. More...
__hostdev__ void	initLut (uint32_t lut[256], uint32_t n)
	Initiate single entry in look-up-table for CRC32 computations. More...
__hostdev__ void	initLut (uint32_t lut[256])
	Initiate entire look-up-table for CRC32 computations. More...
std::unique_ptr< uint32_t[]>	createLut ()
	Create and initiate entire look-up-table for CRC32 computations. More...
__hostdev__ uint32_t	checksum (const void *data, size_t size, uint32_t crc=0)
	Compute crc32 checksum of data of size bytes (without a lookup table)) More...
__hostdev__ uint32_t	checksum (const void *begin, const void *end, uint32_t crc=0)
	Compute crc32 checksum of data between begin and end. More...
__hostdev__ uint32_t	checksum (const void *data, size_t size, const uint32_t lut[256], uint32_t crc=0)
	Compute crc32 checksum of data with size bytes using a lookup table. More...
__hostdev__ uint32_t	checksum (const void *begin, const void *end, const uint32_t lut[256], uint32_t crc=0)
	Compute crc32 checksum of data between begin and end using a lookup table. More...
template<typename ValueT >
uint64_t	checksum (const NanoGrid< ValueT > &grid, ChecksumMode mode)
template<typename ValueT >
bool	validateChecksum (const NanoGrid< ValueT > &grid, ChecksumMode mode)
template<typename ValueT >
void	updateChecksum (NanoGrid< ValueT > &grid, ChecksumMode mode)
bool	updateChecksum (GridData &gridData, ChecksumMode mode)
bool	updateChecksum (GridData *data)
	Preserve the existing mode of the checksum and update it if it's not disabled. More...
bool	updateGridCount (GridData *data, uint32_t gridIndex, uint32_t gridCount)
	Updates the ground index and count, as well as the partial checksum if needed. More...

Detailed Description

Computes a pair of 32bit checksums, of 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.

Macro Definition Documentation

#define NANOVDB_CRC32_LOG2_BLOCK_SIZE   12