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/* Packet Table wrapper classes
*
* Wraps the H5PT Packet Table C functions in C++ objects
*
* Nat Furrer and James Laird
* February 2004
*/
#ifndef H5PTWRAP_H
#define H5PTWRAP_H
#include "H5PT.h"
class H5_HLCPPDLL PacketTable
{
public:
/* Null constructor
* Sets table_id to "invalid"
*/
PacketTable() {table_id = H5I_BADID;}
/* "Open" Constructor
* Opens an existing packet table, which can contain either fixed-length or
* variable-length records.
*/
PacketTable(hid_t fileID, char* name);
/* Destructor
* Cleans up the packet table
*/
~PacketTable();
/* IsValid
* Returns true if this packet table is valid, false otherwise.
* Use this after the constructor to ensure HDF did not have
* any trouble making or opening the packet table.
*/
bool IsValid();
/* IsVariableLength
* Return 1 if this packet table is a Variable Length packet table,
* return 0 if it is Fixed Length. Returns -1 if the table is
* invalid (not open).
*/
int IsVariableLength();
/* ResetIndex
* Sets the "current record" to the first record in the packet table
*/
void ResetIndex();
/* SetIndex
* Sets the current record to point to the record specified by index.
* Returns 0 on success, negative on failure (if index is out of bounds)
*/
int SetIndex(unsigned int index);
/* GetPacketCount
* Returns the number of records in the packet table. Error
* is set to 0 on success. On failure, returns 0 and
* error is set to negative.
*/
unsigned int GetPacketCount(int& error);
unsigned int GetPacketCount()
{
int ignoreError;
return GetPacketCount(ignoreError);
}
protected:
hid_t table_id;
};
class H5_HLCPPDLL FL_PacketTable : virtual public PacketTable
{
public:
/* Constructor
* Creates a packet table in which to store fixed length records.
* Takes the ID of the file the packet table will be created in, the name of
* the packet table, the ID of the datatype of the set, and the size
* of a memory chunk used in chunking.
*/
FL_PacketTable(hid_t fileID, char* name, hid_t dtypeID, int chunkSize);
/* "Open" Constructor
* Opens an existing fixed-length packet table.
* Fails if the packet table specified is variable-length.
*/
FL_PacketTable(hid_t fileID, char* name);
/* AppendPacket
* Adds a single packet to the packet table. Takes a pointer
* to the location of the data in memory.
* Returns 0 on success, negative on failure
*/
int AppendPacket(void * data);
/* AppendPackets (multiple records)
* Adds multiple records to the packet table. Takes the number of records to be
* added and a pointer to their location in memory.
* Returns 0 on success, -1 on failure.
*/
int AppendPackets(unsigned int numRecords, void * data);
/* GetPacket (indexed)
* Gets a single packet from the packet table. Takes the index
* of the record (with 0 being the first record) and a pointer
* to memory where the data should be stored.
* Returns 0 on success, negative on failure
*/
int GetPacket(unsigned int index, void * data);
/* GetPackets (multiple records)
* Gets multiple packets at once, all records between
* startIndex and endIndex inclusive. Also takes a pointer to
* the memory where these records should be stored.
* Returns 0 on success, negative on failure.
*/
int GetPackets(unsigned int startIndex, unsigned int endIndex, void * data);
/* GetNextPacket (single record)
* Gets the next record in the packet table. Takes a pointer to
* memory where the record should be stored.
* Returns 0 on success, negative on failure. Current record
* is not advanced to the next record on failure.
*/
int GetNextPacket(void * data);
/* GetNextPackets (multiple records)
* Gets the next numRecords records in the packet table. Takes a
* pointer to memory where these records should be stored.
* Returns 0 on success, negative on failure. Current record
* is not advanced on failure.
*/
int GetNextPackets(unsigned int numRecords, void * data);
};
class H5_HLCPPDLL VL_PacketTable : virtual public PacketTable
{
public:
/* Constructor
* Creates a packet table in which to store variable length records.
* Takes the ID of the file the packet table will be created in, the name of
* the packet table, and the size of a memory chunk used in chunking.
*/
VL_PacketTable(hid_t fileID, char* name, int chunkSize);
/* "Open" Constructor
* Opens an existing variable-length packet table.
* Fails if the packet table specified is fixed-length.
*/
VL_PacketTable(hid_t fileID, char* name);
/* AppendPacket
* Adds a single packet of any length to the packet table.
* Takes a pointer to the location of the data in memory and the length of the data
* in bytes.
* Returns 0 on success, negative on failure.
*/
int AppendPacket(void * data, unsigned int length);
/* AppendPackets (multiple records)
* Adds multiple variable-length records to the packet table. Takes the number of
* records to be added and a pointer to an array of hvl_t structs in memory.
* Returns 0 on success, negative on failure.
*/
int AppendPackets(unsigned int numRecords, hvl_t * data);
/* GetPacket (indexed)
* Gets a single variable-length record from the packet table. Takes the index
* of the record (with 0 being the first record) and a pointer
* to a hvl_t struct in which to store the record's size and location.
* Returns 0 on success, negative on failure.
*/
int GetPacket(unsigned int index, hvl_t * data);
/* GetPackets (multiple records)
* Gets multiple variable-length records at once, all records between
* startIndex and endIndex inclusive. Takes a pointer to an array
* of hvl_t structs in memory in which to store pointers to the records.
* Returns 0 on success, negative on failure.
*/
int GetPackets(unsigned int startIndex, unsigned int endIndex, hvl_t * data);
/* GetNextPacket (single record)
* Gets the next record in the packet table. Takes a pointer to
* an hvl_t struct where the record should be stored.
* Returns 0 on success, negative on failure. Current record
* is not advanced to the next record on failure.
*/
int GetNextPacket(hvl_t * data);
/* GetNextPackets (multiple records)
* Gets the next numRecords records in the packet table. Takes a
* pointer to an array of hvl_t structs where pointers to the records
* should be stored.
* Returns 0 on success, negative on failure. Current record
* is not advanced on failure.
*/
int GetNextPackets(unsigned int numRecords, hvl_t * data);
/* FreeReadbuff
* Frees the buffers created when variable-length records are read.
* Takes the number of hvl_t structs to be freed and a pointer to their location
* in memory.
* Returns 0 on success, negative on error.
*/
int FreeReadbuff(unsigned int numStructs, hvl_t * buffer);
};
#endif /* H5PTWRAP_H */
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