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TIBCO Rendezvous® 8.8.0

# tibrvMsgData_Decoder

Function Type

## Declaration

    typedef tibrv_status (*tibrvMsgData_Decoder)(
        char**               wire_buffer,
        tibrvMsgField*       field,
        tibrvMsgDataType*    decoded_type);

## Purpose

Decode a wire format field to a local datatype.

## Remarks

Programs define decoders for custom datatypes. Layer 2 decoder functions augment the Wire Format to C Datatype Conversion Matrix.

Each decoder must fulfill these responsibilities:

| • | Set the size, count and data parts of the destination field struct. (The layer 3 function sets the name, id and type.)

| • | Advance `*wire_buffer` to the end the source data (in the message). tibrvMsgData_GetBytes() automatically advances this buffer pointer.

| • | Store the low-level type of the new data reference in `*decoded_type`.

| • | Check consistency, and properly address byte order and endian issues.

Note | If your decoder implementation allocates process storage, it must call tibrvMsgData_Malloc() rather than `malloc`.

Parameter | Description
`wire_buffer` | This parameter receives the location of an address within the wire buffer of the source message. The source data starts at that address.
`field` | This parameter receives the location of a destination field object. The decoder function must set the parts of this field with the source data, its size and count.
`decoded_type` | This parameter receives a location. The decoder function must store the low-level type of the new data reference in that location.

## See Also

tibrvMsgField

tibrvMsgDataType

tibrvMsgData_GetBytes()

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