#include <Decoder.h>

Public Member Functions
	BitpackIntegerDecoder (bool isScaledInteger, unsigned bytestreamNumber, SourceDestBuffer &dbuf, int64_t minimum, int64_t maximum, double scale, double offset, uint64_t maxRecordCount)

size_t	inputProcessAligned (const char *inbuf, const size_t firstBit, const size_t endBit) override

Public Member Functions inherited from e57::BitpackDecoder
void	destBufferSetNew (std::vector< SourceDestBuffer > &dbufs) override

size_t	inputProcess (const char *source, const size_t availableByteCount) override

virtual size_t	inputProcessAligned (const char *inbuf, const size_t firstBit, const size_t endBit)=0

void	stateReset () override

uint64_t	totalRecordsCompleted () override

Public Member Functions inherited from e57::Decoder
unsigned	bytestreamNumber () const

	Decoder ()=delete

virtual void	destBufferSetNew (std::vector< SourceDestBuffer > &dbufs)=0

virtual size_t	inputProcess (const char *source, const size_t count)=0

virtual void	stateReset ()=0

virtual uint64_t	totalRecordsCompleted ()=0

virtual	~Decoder ()=default

Protected Attributes
unsigned	bitsPerRecord_

RegisterT	destBitMask_

bool	isScaledInteger_

int64_t	maximum_

int64_t	minimum_

double	offset_

double	scale_

Protected Attributes inherited from e57::BitpackDecoder
unsigned int	bitsPerWord_

unsigned int	bytesPerWord_

uint64_t	currentRecordIndex_ = 0

std::shared_ptr< SourceDestBufferImpl >	destBuffer_

std::vector< char >	inBuffer_

unsigned int	inBufferAlignmentSize_

size_t	inBufferEndByte_ = 0

size_t	inBufferFirstBit_ = 0

uint64_t	maxRecordCount_ = 0

Protected Attributes inherited from e57::Decoder
unsigned int	bytestreamNumber_

Additional Inherited Members
Static Public Member Functions inherited from e57::Decoder
static std::shared_ptr< Decoder >	DecoderFactory (unsigned bytestreamNumber, const CompressedVectorNodeImpl *cVector, std::vector< SourceDestBuffer > &dbufs, const ustring &codecPath)

Protected Member Functions inherited from e57::BitpackDecoder
	BitpackDecoder (unsigned bytestreamNumber, SourceDestBuffer &dbuf, unsigned alignmentSize, uint64_t maxRecordCount)

void	inBufferShiftDown ()

Protected Member Functions inherited from e57::Decoder
	Decoder (unsigned bytestreamNumber)

Constructor & Destructor Documentation

◆ BitpackIntegerDecoder()

template<typename RegisterT >

BitpackIntegerDecoder::BitpackIntegerDecoder	(	bool	isScaledInteger,
		unsigned	bytestreamNumber,
		SourceDestBuffer &	dbuf,
		int64_t	minimum,
		int64_t	maximum,
		double	scale,
		double	offset,
		uint64_t	maxRecordCount
	)

Get pointer to parent ImageFileImpl

References e57::BitpackIntegerDecoder< RegisterT >::bitsPerRecord_, e57::BitpackIntegerDecoder< RegisterT >::destBitMask_, e57::BitpackIntegerDecoder< RegisterT >::maximum_, and e57::BitpackIntegerDecoder< RegisterT >::minimum_.

Member Function Documentation

◆ inputProcessAligned()

template<typename RegisterT >

size_t BitpackIntegerDecoder::inputProcessAligned	(	const char *	inbuf,
		const size_t	firstBit,
		const size_t	endBit
	)

overridevirtual

Read from inbuf, decode, store in destBuffer Repeat until have filled destBuffer, or completed all records

Precalculate exact number of full records that are in inbuf We can handle the case where don't have a full word at end of inbuf, but all the bits of the record are there;

Number of transfers is the smaller of what was requested and what is available in input.

The index in inbuf of the word we are currently working on.

For example on little endian machine: Assume: registerT=uint32_t, bitOffset=20, destBitMask=0x00007fff (for a 15 bit value). inp[wordPosition] LLLLLLLL LLLLXXXX XXXXXXXX XXXXXXXX Note LSB of value is at bit20 inp(wordPosition+1] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXHHH H=high bits of value, X=uninteresting bits low = inp[i] >> bitOffset 00000000 00000000 0000LLLL LLLLLLLL L=low bits of value, X=uninteresting bits high = inp[i+1] << (32-bitOffset) XXXXXXXX XXXXXXXX XHHH0000 00000000 w = high | low XXXXXXXX XXXXXXXX XHHHLLLL LLLLLLLL destBitmask 00000000 00000000 01111111 11111111 w & mask 00000000 00000000 0HHHLLLL LLLLLLLL

Get lower word (contains at least the LSbit of the value),

Get upper word (may or may not contain interesting bits),

Shift high to just above the lower bits, shift low LSBit to bit0, OR together. Note shifts are logical (not arithmetic) because using unsigned variables.

The left shift (used above) is not defined if shift is >= size of word

Mask off uninteresting bits

Add minimum_ to value to get back what writer originally sent

The parameter isScaledInteger_ determines which version of setNextInt64 gets called

Store the result in next avaiable position in the user's dest buffer

Calc next bit alignment and which word it starts in

Update counts of records processed

double e57::BitpackIntegerDecoder< RegisterT >::offset_

protected

◆ scale_

template<typename RegisterT >

double e57::BitpackIntegerDecoder< RegisterT >::scale_

protected

The documentation for this class was generated from the following files:

FreeCAD/src/3rdParty/libE57Format/src/Decoder.h
FreeCAD/src/3rdParty/libE57Format/src/Decoder.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ BitpackIntegerDecoder()

Member Function Documentation

◆ inputProcessAligned()

Member Data Documentation

◆ bitsPerRecord_

◆ destBitMask_

◆ isScaledInteger_

◆ maximum_

◆ minimum_

◆ offset_

◆ scale_