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Objective Systems, Inc.

Memory stream functions.

Memory stream functions are used for memory stream operations. More...

Functions

int rtxStreamMemoryCreate (OSCTXT *pctxt, OSUINT16 flags)
 Opens a memory stream.
int rtxStreamMemoryAttach (OSCTXT *pctxt, OSOCTET *pMemBuf, size_t bufSize, OSUINT16 flags)
 Opens a memory stream using the specified memory buffer.
OSOCTET * rtxStreamMemoryGetBuffer (OSCTXT *pctxt, size_t *pSize)
 This function returns the memory buffer and its size for the given memory stream.
int rtxStreamMemoryCreateReader (OSCTXT *pctxt, OSOCTET *pMemBuf, size_t bufSize)
 This function creates an input memory stream using the specified buffer.
int rtxStreamMemoryCreateWriter (OSCTXT *pctxt, OSOCTET *pMemBuf, size_t bufSize)
 This function creates an output memory stream using the specified buffer.

Detailed Description

Memory stream functions are used for memory stream operations.

Function Documentation

int rtxStreamMemoryAttach (  OSCTXT *  pctxt,
OSOCTET *  pMemBuf,
size_t  bufSize,
OSUINT16  flags
) 
 

Opens a memory stream using the specified memory buffer.

The 'flags' parameter specifies the access mode for the stream - input or output.

Parameters:
pctxt Pointer to a context structure variable that has been initialized for stream operations.
pMemBuf The pointer to the buffer.
bufSize The size of the buffer.
flags Specifies the access mode for the stream:
  • OSRTSTRMF_INPUT = input (reading) stream;
  • OSRTSTRMF_OUTPUT = output (writing) stream.
Returns:
Completion status of operation: 0 = success, negative return value is error.

int rtxStreamMemoryCreate (  OSCTXT *  pctxt,
OSUINT16  flags
) 
 

Opens a memory stream.

A memory buffer will be created by this function. The 'flags' parameter specifies the access mode for the stream - input or output.

Parameters:
pctxt Pointer to a context structure variable that has been initialized for stream operations.
flags Specifies the access mode for the stream:
  • OSRTSTRMF_INPUT = input (reading) stream;
  • OSRTSTRMF_OUTPUT = output (writing) stream.
Returns:
Completion status of operation: 0 = success, negative return value is error.

int rtxStreamMemoryCreateReader (  OSCTXT *  pctxt,
OSOCTET *  pMemBuf,
size_t  bufSize
) 
 

This function creates an input memory stream using the specified buffer.

Parameters:
pctxt Pointer to a context structure variable that has been initialized for stream operations.
pMemBuf The pointer to the buffer
bufSize The size of the buffer
Returns:
Completion status of operation: 0 = success, negative return value is error.

int rtxStreamMemoryCreateWriter (  OSCTXT *  pctxt,
OSOCTET *  pMemBuf,
size_t  bufSize
) 
 

This function creates an output memory stream using the specified buffer.

If pMemBuf or bufSize is NULL then new buffer will be allocated.

Parameters:
pctxt Pointer to a context structure variable that has been initialized for stream operations.
pMemBuf The pointer to the buffer. Can be NULL - new buffer will be allocated in this case.
bufSize The size of the buffer. Can be 0 - new buffer will be allocated in this case.
Returns:
Completion status of operation: 0 = success, negative return value is error.

OSOCTET* rtxStreamMemoryGetBuffer (  OSCTXT *  pctxt,
size_t *  pSize
) 
 

This function returns the memory buffer and its size for the given memory stream.

Parameters:
pctxt Pointer to a context structure variable that has been initialized for stream operations.
pSize The pointer to size_t to receive the size of buffer.
Returns:
The pointer to memory buffer. NULL, if error occured.

This file was last modified on 8 Jan 2007.
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