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QSEP.h File Reference

Interface to physics event context handling and updating routines. More...

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Typedefs

typedef enum _QSEP_STATUS_K QSEP_STATUS_K
 Typedef for QSEP_STATUS_K.

Enumerations

enum  _QSEP_STATUS_K {
  QSEP_STATUS_K_ERR = -1,
  QSEP_STATUS_K_TOO_SMALL = -2,
  QSEP_STATUS_K_INSRSC = -3,
  QSEP_STATUS_K_UNKLVL = -7,
  QSEP_STATUS_K_NOGEM = -8,
  QSEP_STATUS_K_OVRRUN = -9,
  QSEP_STATUS_K_UNDRUN = -10,
  QSEP_STATUS_K_INCLEN = -11,
  QSEP_STATUS_K_DECOMPRESS = -12
}
 Enumeration of the status codes. More...

Functions

QSEP * QSEP_alloc (int resource_level)
 Allocates and constructs the QSEP handle.
int QSEP_ebfSizeof (void)
 Returns the maximum size, in bytes, of an EBF event.
void QSEP_updateAtDatagram (QSEP *qsep, const LSF_datagram *dgm)
 Updates the run oriented information in the event context using the information from the event datagram.
void QSEP_updateAtContribution (QSEP *qsep, const LSF_contribution *ctb)
 Updates the context based on the contribution.
int QSEP_updateAtRecord (QSEP *qsep, const LSF_record *rec)
 Updates the context based on the record.
int QSEP_expand (QSEP *qsep, const LSF_record *rec, QSE_ebfEvt *ebf, int ebf_size, int *ret_size)
 Expands the event into EBF format.
void QSEP_destruct (QSEP *qsep)
 Destroys the QSEP handle.
const QSE_ctx * QSEP_stdCtxGet (const QSEP *qsep)
 Return a pointer to the standard QSE context block.
const QSEP_ctx * QSEP_appCtxGet (const QSEP *qsep)
 Return a pointer to the public QSEP application specific context block.
int QSEP_sizeof (unsigned int resource_level, void *prm)
 Returns the size, in bytes, of the handle for updating the standard event meta-information.
QSEP * QSEP_construct (QSEP *qsep, unsigned int resource_level, void *prm)
 Construct (initializes) the handle for updating the standard event meta-information.
const QSE_evt * QSEP_decode (QSEP *qsep, const LSF_record *rec, unsigned int options)

Detailed Description

Interface to physics event context handling and updating routines.

Author:
JJRussell - russell@slac.stanford.edu
   CVS $Id: QSEP.h,v 1.7 2007/10/27 00:58:15 russell Exp $

Typedef Documentation

QSEP_STATUS_K
 

Typedef for QSEP_STATUS_K.

The errors breakdown into roughly two categories
  1. User errors
  2. Internal errors
User Errors
Currently there are two user errors.
  1. Attempting to decode an event with compression level that exceeds what the user configured the decoder to handle. This maximum level is specified when allocating the QSEP handle.
  2. The user specified an output buffer that was too small to accommodate the event.
Internal Errors
The candidates for causing these errors are
  1. Internal error on the encoding side, i.e. the software that formatted and wrote the event out has an error.
  2. Internal error on the decoding side, i.e. the software that is decoding the event has an error.
  3. The input data was corrupted (for example a memory overwrite) after it was read in.

Enumeration Type Documentation

enum _QSEP_STATUS_K
 

Enumeration of the status codes.

Enumerator:
QSEP_STATUS_K_ERR  Generic failure
QSEP_STATUS_K_TOO_SMALL  The user provided buffer is too small to accommodate the expanded event.
QSEP_STATUS_K_INSRSC  Insuffient resources to expand the requested input event format/compression level. The format/compression level is one of the known formats, but the user did not configure the expansion software with sufficient resources to handle it
QSEP_STATUS_K_UNKLVL  Unknown input event format/compression level. This is likely an internal error or an attempt to use an older version of the QSEP code that did not, at that time, support the specified format/compression level
QSEP_STATUS_K_NOGEM  The GEM contribution could not be located in the input data. Without the GEM contribution, the extended counter information cannot be updated. This is likely caused by an internal error. It is possible that there is a bug in the encoding/decoding of the data or that the input data was somehow corrupted.
QSEP_STATUS_K_OVRRUN  There was data still in the input was still left after expanding thought it had completed. This is likely caused by an internal error. It is possible that there is a bug in the encoding/decoding of the data or that the input data was somehow corrupted.
QSEP_STATUS_K_UNDRUN  The input data was exhausted before the expansion thought it had completed. This is likely caused by an internal error. It is possible that there is a bug in the encoding/decoding of the data or that the input data was somehow corrupted.
QSEP_STATUS_K_INCLEN  An inconsistency in the calculation of the number of bytes to in the output stream and actual number. This is purely an internal error in the expansion/unpacking routines
QSEP_STATUS_K_DECOMPRESS  Decompression failure. This is purely an internal error likely within the compression/decompression routines

Function Documentation

QSEP* QSEP_alloc (  int  resource_level  ) 
 

Allocates and constructs the QSEP handle.

Returns:
A pointer to the allocated and constructed QSEP handle
Parameters:
resource_level The maximum resource level that is needed
Warning:
Setting the resource_level parameter to a high value to be safe may result in the attempting to garner resources that only are not necessary but may not be available. For example, the highest levels of compression need access to CAL pedestal files. In this case, QSEP_construct will attempt to open the files and if they cannot be located, will fail.
In this case, this routine may have needlessly failed. The watch word here is set it only as high as necessary.

const QSEP_ctx* QSEP_appCtxGet (  const QSEP *  qsep  ) 
 

Return a pointer to the public QSEP application specific context block.

Returns:
A pointer to the QSEP application specific context block
Parameters:
qsep The physics event handle
This routine is just an accessor to keep the structure of QSEP private.

QSEP* QSEP_construct (  QSEP *  qsep,
unsigned int  resource_level,
void *  prm
) 
 

Construct (initializes) the handle for updating the standard event meta-information.

Returns:
The QSEP context structure or NULL on error
Parameters:
qsep The handle to initialize, if specified as NULL, one will be allocated
resource_level The maximum resource level. Attempts to expand event with resources needs above this value will return QSEP_STATUS_K_INSRSC, that is INSUFFICIENT RESOURCES.
prm A run-time set parameter used to stylize the configuration

void QSEP_destruct (  QSEP *  qsep  ) 
 

Destroys the QSEP handle.

Returns:
The QSEP context structure
Parameters:
qsep The handle to destroy

int QSEP_ebfSizeof (  void   ) 
 

Returns the maximum size, in bytes, of an EBF event.

Returns:
The maximum size, in bytes, of an EBF event

int QSEP_expand (  QSEP *  qsep,
const LSF_record *  rec,
QSE_ebfEvt *  ebf,
int  ebf_size,
int *  ret_size
) 
 

Expands the event into EBF format.

Return values:
0,Successful expand
<0,Failute,see the enumeration QSEP_STATUS_K for the reasons
Parameters:
qsep The physics event handle
rec The LSF record containing the event
ebf The ebf buffer to expand the event into, this pointer must be 32-bit aligned
ebf_size The size, in bytes, of the buffer
ret_size Returned as the status of the expand
This just launders the call

int QSEP_sizeof (  unsigned int  resource_level,
void *  prm
) 
 

Returns the size, in bytes, of the handle for updating the standard event meta-information.

Returns:
The size, in bytes, of the handle for updating the standard event meta-information
Parameters:
resource_level The maximum resource level. Attempts to expand event with compression levels that use resources beyond this value will return QSEP_STATUS_K_INSRSC that is INSUFFICIENT RESOURCES. This must be a number between 0 and 15. This parameter plus prm must also be passed to QSEP_construct
prm A run-time set parameter used to stylize the configuration. This parameter plus max_level must also be passed to QSEP_construct.

const QSE_ctx* QSEP_stdCtxGet (  const QSEP *  qsep  ) 
 

Return a pointer to the standard QSE context block.

Returns:
A pointer to the QSE context block
Parameters:
qsep The physics event handle
This routine is just an accessor to keep the structure of QSEP private.

void QSEP_updateAtContribution (  QSEP *  qsep,
const LSF_contribution *  ctb
) 
 

Updates the context based on the contribution.

Return values:
0,if the contribution is non-record
1,if the contribution is an contribution
Parameters:
qsep The physics event handle to update
ctb The contribution

void QSEP_updateAtDatagram (  QSEP *  qsep,
const LSF_datagram *  dgm
) 
 

Updates the run oriented information in the event context using the information from the event datagram.

Parameters:
qsep The physics event handle
dgm The event datagram
Note:
The root contribution is opaque to the caller, so QSEP must handle the contributions within the root. There are two strategies one could use
  1. Call LSF_scanContribtions and let it parse through them and invoke a user call back routine
  2. Do the scan by hand.
Initially I have opted for strategy #1, but the second strategy makes detailed error checking easier. For example, if the sequence of the contributions is fixed, it is likely easier to do this when doing the scan by hand.

int QSEP_updateAtRecord (  QSEP *  qsep,
const LSF_record *  rec
) 
 

Updates the context based on the record.

Return values:
Positive values indicate a successful update to an event record
Negative values indicate an unsuccessful update to an event record
0 indicates that this was not an event record
Parameters:
qsep The physics event handle to update
rec The event record

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