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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 */