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diff --git a/fluent-bit/lib/librdkafka-2.1.0/src/rdvarint.h b/fluent-bit/lib/librdkafka-2.1.0/src/rdvarint.h
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+++ b/fluent-bit/lib/librdkafka-2.1.0/src/rdvarint.h
@@ -0,0 +1,165 @@
+/*
+ * librdkafka - The Apache Kafka C/C++ library
+ *
+ * Copyright (c) 2016 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 _RDVARINT_H
+#define _RDVARINT_H
+
+#include "rd.h"
+#include "rdbuf.h"
+
+/**
+ * @name signed varint zig-zag encoder/decoder
+ * @{
+ *
+ */
+
+/**
+ * @brief unsigned-varint encodes unsigned integer \p num into buffer
+ *        at \p dst of size \p dstsize.
+ * @returns the number of bytes written to \p dst, or 0 if not enough space.
+ */
+
+static RD_INLINE RD_UNUSED size_t rd_uvarint_enc_u64(char *dst,
+                                                     size_t dstsize,
+                                                     uint64_t num) {
+        size_t of = 0;
+
+        do {
+                if (unlikely(of >= dstsize))
+                        return 0; /* Not enough space */
+
+                dst[of++] = (num & 0x7f) | (num > 0x7f ? 0x80 : 0);
+                num >>= 7;
+        } while (num);
+
+        return of;
+}
+
+/**
+ * @brief encodes a signed integer using zig-zag encoding.
+ * @sa rd_uvarint_enc_u64
+ */
+static RD_INLINE RD_UNUSED size_t rd_uvarint_enc_i64(char *dst,
+                                                     size_t dstsize,
+                                                     int64_t num) {
+        return rd_uvarint_enc_u64(dst, dstsize, (num << 1) ^ (num >> 63));
+}
+
+
+static RD_INLINE RD_UNUSED size_t rd_uvarint_enc_i32(char *dst,
+                                                     size_t dstsize,
+                                                     int32_t num) {
+        return rd_uvarint_enc_i64(dst, dstsize, num);
+}
+
+
+
+/**
+ * @brief Use on return value from rd_uvarint_dec() to check if
+ *        decoded varint fit the size_t.
+ *
+ * @returns 1 on overflow, else 0.
+ */
+#define RD_UVARINT_OVERFLOW(DEC_RETVAL) (DEC_RETVAL > SIZE_MAX)
+
+/**
+ * @returns 1 if there were not enough bytes to decode the varint, else 0.
+ */
+#define RD_UVARINT_UNDERFLOW(DEC_RETVAL) (DEC_RETVAL == 0)
+
+
+/**
+ * @param DEC_RETVAL the return value from \c rd_uvarint_dec()
+ * @returns 1 if varint decoding failed, else 0.
+ * @warning \p DEC_RETVAL will be evaluated twice.
+ */
+#define RD_UVARINT_DEC_FAILED(DEC_RETVAL)                                      \
+        (RD_UVARINT_UNDERFLOW(DEC_RETVAL) || RD_UVARINT_OVERFLOW(DEC_RETVAL))
+
+
+/**
+ * @brief Decodes the unsigned-varint in buffer \p src of size \p srcsize
+ *        and stores the decoded unsigned integer in \p nump.
+ *
+ * @remark Use RD_UVARINT_OVERFLOW(returnvalue) to check if the varint
+ *         could not fit \p nump, and RD_UVARINT_UNDERFLOW(returnvalue) to
+ *         check if there were not enough bytes available in \p src to
+ *         decode the full varint.
+ *
+ * @returns the number of bytes read from \p src.
+ */
+static RD_INLINE RD_UNUSED size_t rd_uvarint_dec(const char *src,
+                                                 size_t srcsize,
+                                                 uint64_t *nump) {
+        size_t of    = 0;
+        uint64_t num = 0;
+        int shift    = 0;
+
+        do {
+                if (unlikely(srcsize-- == 0))
+                        return 0; /* Underflow */
+                num |= (uint64_t)(src[(int)of] & 0x7f) << shift;
+                shift += 7;
+        } while (src[(int)of++] & 0x80);
+
+        *nump = num;
+        return of;
+}
+
+static RD_INLINE RD_UNUSED size_t rd_varint_dec_i64(const char *src,
+                                                    size_t srcsize,
+                                                    int64_t *nump) {
+        uint64_t n;
+        size_t r;
+
+        r = rd_uvarint_dec(src, srcsize, &n);
+        if (likely(!RD_UVARINT_DEC_FAILED(r)))
+                *nump = (int64_t)(n >> 1) ^ -(int64_t)(n & 1);
+
+        return r;
+}
+
+
+/**
+ * @returns the maximum encoded size for a type
+ */
+#define RD_UVARINT_ENC_SIZEOF(TYPE) (sizeof(TYPE) + 1 + (sizeof(TYPE) / 7))
+
+/**
+ * @returns the encoding size of the value 0
+ */
+#define RD_UVARINT_ENC_SIZE_0() ((size_t)1)
+
+
+int unittest_rdvarint(void);
+
+/**@}*/
+
+
+#endif /* _RDVARINT_H */