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"

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

Functions
template<typename BuildT >
uint64_t	nanovdb::checksum (const NanoGrid< BuildT > &grid, ChecksumMode mode=ChecksumMode::Default)
	Return the (2 x CRC32) checksum of the specified grid. More...
template<typename BuildT >
bool	nanovdb::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	nanovdb::updateChecksum (NanoGrid< BuildT > &grid, ChecksumMode mode=ChecksumMode::Default)
	Updates the checksum of a grid. More...
__hostdev__ void	nanovdb::crc32::initLut (uint32_t lut[256], uint32_t n)
	Initiate single entry in look-up-table for CRC32 computations. More...
__hostdev__ void	nanovdb::crc32::initLut (uint32_t lut[256])
	Initiate entire look-up-table for CRC32 computations. More...
std::unique_ptr< uint32_t[]>	nanovdb::crc32::createLut ()
	Create and initiate entire look-up-table for CRC32 computations. More...
__hostdev__ uint32_t	nanovdb::crc32::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	nanovdb::crc32::checksum (const void *begin, const void *end, uint32_t crc=0)
	Compute crc32 checksum of data between begin and end. More...
__hostdev__ uint32_t	nanovdb::crc32::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	nanovdb::crc32::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	nanovdb::checksum (const NanoGrid< ValueT > &grid, ChecksumMode mode)
template<typename ValueT >
bool	nanovdb::validateChecksum (const NanoGrid< ValueT > &grid, ChecksumMode mode)
template<typename ValueT >
void	nanovdb::updateChecksum (NanoGrid< ValueT > &grid, ChecksumMode mode)
bool	nanovdb::updateChecksum (GridData &gridData, ChecksumMode mode)
bool	nanovdb::updateChecksum (GridData *data)
	Preserve the existing mode of the checksum and update it if it's not disabled. More...
bool	nanovdb::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.

Definition in file GridChecksum.h.

Macro Definition Documentation

#define NANOVDB_CRC32_LOG2_BLOCK_SIZE   12

Definition at line 33 of file GridChecksum.h.