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/*
* librdkafka - The Apache Kafka C/C++ library
*
* Copyright (c) 2017 Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RDKAFKA_HEADER_H
#define _RDKAFKA_HEADER_H
/**
* @brief The header list (rd_kafka_headers_t) wraps the generic rd_list_t
* with additional fields to keep track of the total on-wire size.
*/
struct rd_kafka_headers_s {
rd_list_t rkhdrs_list; /**< List of (rd_kafka_header_t *) */
size_t rkhdrs_ser_size; /**< Total serialized size of headers */
};
/**
* @brief The header item itself is a single-allocation immutable structure
* (rd_kafka_header_t) containing the header name, value and value
* length.
* Both the header name and header value are nul-terminated for
* API convenience.
* The header value is a tri-state:
* - proper value (considered binary) with length > 0
* - empty value with length = 0 (pointer is non-NULL and nul-termd)
* - null value with length = 0 (pointer is NULL)
*/
typedef struct rd_kafka_header_s {
size_t rkhdr_ser_size; /**< Serialized size */
size_t rkhdr_value_size; /**< Value length (without nul-term) */
size_t rkhdr_name_size; /**< Header name size (w/o nul-term) */
char *rkhdr_value; /**< Header value (nul-terminated string but
* considered binary).
* Will be NULL for null values, else
* points to rkhdr_name+.. */
char rkhdr_name[1]; /**< Header name (nul-terminated string).
* Followed by allocation for value+nul */
} rd_kafka_header_t;
/**
* @returns the serialized size for the headers
*/
static RD_INLINE RD_UNUSED size_t
rd_kafka_headers_serialized_size(const rd_kafka_headers_t *hdrs) {
return hdrs->rkhdrs_ser_size;
}
#endif /* _RDKAFKA_HEADER_H */
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