GENERICRW Class Reference

Base class for generic read/write data source/target. More...

#include <mi32/genericrw.h>

Inheritance diagram for GENERICRW:

[legend]List of all members.

Public Types
enum	CAPABILITIES {   CAPABILITY_None = 0x0000, CAPABILITY_Read = 0x0001, CAPABILITY_Write = 0x0002, CAPABILITY_Seek = 0x0004,   CAPABILITY_Resize = 0x0008, CAPABILITY_Accept = 0x0010, CAPABILITY_Bind = 0x0020, CAPABILITY_NonBlocking = 0x0040,   CAPABILITY_Size = 0x0080, CAPABILITIES_All = 0x00FF }
enum	SEEKFROM { SEEKFROM_Beginning = 0, SEEKFROM_Current, SEEKFROM_End }
Public Member Functions
CAPABILITIES	GetCapabilities () const
void *	GetMappedMemory (INT64 &size, INT64 offset=0)
INT64	GetSize () const
INT64	GetSizeLimit () const
INT32	Read (void *buffer, INT32 numbytes, bool AllowPartial=false)
ERRVALUE	Resize (INT64 newsize)
INT64	Seek (INT64 offset, SEEKFROM from=SEEKFROM_Beginning)
ERRVALUE	SeekAndRead (INT64 offset, void *buffer, INT32 numbytes)
ERRVALUE	SeekAndWrite (INT64 offset, const void *buffer, INT32 numbytes)
INT64	Tell () const
ERRVALUE	Write (const void *buffer, INT32 numbytes)
Protected Member Functions
	~GENERICRW ()
Private Member Functions
virtual CAPABILITIES	v_GetCapabilities () const=0
virtual void *	v_GetMappedMemory (INT64 &size, INT64 offset)
virtual INT64	v_GetSize () const=0
virtual INT64	v_GetSizeLimit () const=0
virtual INT32	v_Read (void *buffer, INT32 numbytes, bool AllowPartial)=0
virtual ERRVALUE	v_Resize (INT64 newsize)=0
virtual INT64	v_Seek (INT64 offset, SEEKFROM from)=0
virtual INT64	v_Tell () const=0
virtual ERRVALUE	v_Write (const void *buffer, INT32 numbytes)=0

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Detailed Description

Base class for generic read/write data source/target.

Definition at line 73 of file genericrw.h.

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Member Enumeration Documentation

enum GENERICRW::CAPABILITIES

Enumeration for instance capabilities.

Enumerator:

CAPABILITY_None
CAPABILITY_Read
CAPABILITY_Write
CAPABILITY_Seek
CAPABILITY_Resize
CAPABILITY_Accept	Can accept incoming connections (Sockets implement this).
CAPABILITY_Bind	Can bind to a specific port (Sockes implement this).
CAPABILITY_NonBlocking	Can be set to have read/write return immediately if not ready.
CAPABILITY_Size	We can find the size.
CAPABILITIES_All

Definition at line 84 of file genericrw.h.

enum GENERICRW::SEEKFROM

Enumeration for where to seek from.

Enumerator:

SEEKFROM_Beginning
SEEKFROM_Current
SEEKFROM_End

Definition at line 77 of file genericrw.h.

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Constructor & Destructor Documentation

GENERICRW::~GENERICRW

(

)

[protected]

Destructor.

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Member Function Documentation

CAPABILITIES GENERICRW::GetCapabilities

(

)

const

Get instance capabilities.

Returns:

Capabilities

void* GENERICRW::GetMappedMemory	(	INT64 &	size,
		INT64	offset = 0
	)

Get memory-mapped buffer containing data.

Returns:

Pointer to mapped memory, or null if operation is not supported.

Parameters:

size	size of buffer returned
offset	offset into data

INT64 GENERICRW::GetSize

(

)

const

Get current size of data.

Note, if instance does not support seeking then size returned may be less than ultimate amount of data which may be read.

Returns:

Current size or error < 0

INT64 GENERICRW::GetSizeLimit

(

)

const

Get maximum possible size of data.

Returns:

Maximum possible size in bytes.

INT32 GENERICRW::Read	(	void *	buffer,
		INT32	numbytes,
		bool	AllowPartial = false
	)

Read data into buffer.

Returns:

Number of bytes read (may be less than requested), 0 if no more available at present, -1 if end of data, < -1 if error

Parameters:

buffer	Buffer to read into
numbytes	Number of bytes to read
AllowPartial	Allow partial reads, if false will return error if less than requested number of bytes were read.

ERRVALUE GENERICRW::Resize

(

INT64

newsize

)

Resize data.

May be used to truncate or extend the data, if used to extend, the contents beyond the old end of data and the new size are undefined.

Parameters:

newsize

New size in bytes

INT64 GENERICRW::Seek	(	INT64	offset,
		SEEKFROM	from = SEEKFROM_Beginning
	)

Seek to specified location.

Returns:

Offset from beginning of data, < 0 if error

Parameters:

offset	Location to seek to
from	Relative position to seek from

ERRVALUE GENERICRW::SeekAndRead	(	INT64	offset,
		void *	buffer,
		INT32	numbytes
	)

Seek to specified position and read.

Returns:

Number of bytes read (may be less than requested), 0 if no more available at present, -1 if end of data, < -1 if error

Parameters:

offset	Offset from beginning of data stream
buffer	Buffer to contain data
numbytes	Number of bytes to read

ERRVALUE GENERICRW::SeekAndWrite	(	INT64	offset,
		const void *	buffer,
		INT32	numbytes
	)

Seek to specified position and write.

Parameters:

offset	Offset from beginning of data stream
buffer	Buffer containing data to write
numbytes	Number of bytes to write

INT64 GENERICRW::Tell

(

)

const

Return current read/write position.

Returns:

Current offset from start of data or error < 0.

virtual CAPABILITIES GENERICRW::v_GetCapabilities

(

)

const [private, pure virtual]

Override to get instance capabilities.

virtual void* GENERICRW::v_GetMappedMemory	(	INT64 &	size,
		INT64	offset
	)			[private, virtual]

Override to get mapped memory.

virtual INT64 GENERICRW::v_GetSize

(

)

const [private, pure virtual]

Override to get data size.

virtual INT64 GENERICRW::v_GetSizeLimit

(

)

const [private, pure virtual]

Override to get maximum possible data size.

virtual INT32 GENERICRW::v_Read	(	void *	buffer,
		INT32	numbytes,
		bool	AllowPartial
	)			[private, pure virtual]

Override to read data.

Returns:

Number of bytes read (may be less than requested), 0 if no more available at present, -1 if end of data, < -1 if error

virtual ERRVALUE GENERICRW::v_Resize

(

INT64

newsize

)

[private, pure virtual]

Override to resize.

virtual INT64 GENERICRW::v_Seek	(	INT64	offset,
		SEEKFROM	from
	)			[private, pure virtual]

Override to seek.

virtual INT64 GENERICRW::v_Tell

(

)

const [private, pure virtual]

Override to return current position.

virtual ERRVALUE GENERICRW::v_Write	(	const void *	buffer,
		INT32	numbytes
	)			[private, pure virtual]

Override to write data.

ERRVALUE GENERICRW::Write	(	const void *	buffer,
		INT32	numbytes
	)

Write data from buffer.

Parameters:

buffer	Buffer to write from
numbytes	Number of bytes to write

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

• mi32/genericrw.h

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