FastWriteMemoryStream Class Reference

This class is a copy of MemoryStream for the purpose of fixing the growing issue encountered on Windows 10 when writing a lot of data to it. More...

#include <FastWriteMemoryStream.h>

Inherits IBStream.

Public Member Functions
void	clear ()
	FastWriteMemoryStream ()
char const *	getData () const
TSize	getSize () const
int64	pos () const
virtual tresult PLUGIN_API	read (void *buffer, int32 numBytes, int32 *numBytesRead) SMTG_OVERRIDE
void	reset ()
virtual tresult PLUGIN_API	seek (int64 pos, int32 mode, int64 *result) SMTG_OVERRIDE
void	setSize (TSize size)
	returns the current memory size
virtual tresult PLUGIN_API	tell (int64 *pos) SMTG_OVERRIDE
virtual tresult PLUGIN_API	write (void *buffer, int32 numBytes, int32 *numBytesWritten) SMTG_OVERRIDE
virtual	~FastWriteMemoryStream ()

Protected Attributes
bool	allocationError
int64	cursor
char *	memory
TSize	memorySize
TSize	size

Detailed Description

This class is a copy of MemoryStream for the purpose of fixing the growing issue encountered on Windows 10 when writing a lot of data to it.

MemoryStream essentially adds 4k whenever new memory is needed and although realloc is being used, it is extremelly slow on PC/Windows 10. This class implements a similar strategy found in std::vector: the memory is doubled every time which leads to much less realloc and much faster performance.

This class does not implement the "non-owning" code since MemoryStream can be used for this (no memory allocation).

This class fixes the issue with MemoryStream::seek which blindly sets the cursor potentially outside the valid boundaries.

Constructor & Destructor Documentation

FastWriteMemoryStream()

FastWriteMemoryStream

(

)

~FastWriteMemoryStream()

~FastWriteMemoryStream ( )

virtual

Member Function Documentation

clear()

void clear ( )

inline

getData()

char const * getData ( ) const

inline

getSize()

TSize getSize ( ) const

inline

pos()

int64 pos ( ) const

inline

read()

tresult PLUGIN_API read ( void * buffer, int32 numBytes, int32 * numBytesRead )

virtual

reset()

void reset

(

)

seek()

tresult PLUGIN_API seek ( int64 pos, int32 mode, int64 * result )

virtual

setSize()

void setSize

(

TSize

size

)

returns the current memory size

set the memory size, a realloc will occur if memory already used

tell()

tresult PLUGIN_API tell ( int64 * pos )

virtual

write()

tresult PLUGIN_API write ( void * buffer, int32 numBytes, int32 * numBytesWritten )

virtual

Member Data Documentation

allocationError

bool allocationError

protected

cursor

int64 cursor

protected

memory

char* memory

protected

memorySize

TSize memorySize

protected

size

TSize size

protected

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

• pongasoft/VST/VstUtils/FastWriteMemoryStream.h
• pongasoft/VST/VstUtils/FastWriteMemoryStream.cpp