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+nghttp2_hd_deflate_hd_vec
+=========================
+
+Synopsis
+--------
+
+*#include <nghttp2/nghttp2.h>*
+
+.. function:: ssize_t nghttp2_hd_deflate_hd_vec(nghttp2_hd_deflater *deflater, const nghttp2_vec *vec, size_t veclen, const nghttp2_nv *nva, size_t nvlen)
+
+    
+    Deflates the *nva*, which has the *nvlen* name/value pairs, into
+    the *veclen* size of buf vector *vec*.  The each size of buffer
+    must be set in len field of :type:`nghttp2_vec`.  If and only if
+    one chunk is filled up completely, next chunk will be used.  If
+    *vec* is not large enough to store the deflated header block, this
+    function fails with
+    :macro:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`.  The caller
+    should use `nghttp2_hd_deflate_bound()` to know the upper bound of
+    buffer size required to deflate given header name/value pairs.
+    
+    Once this function fails, subsequent call of this function always
+    returns :macro:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`.
+    
+    After this function returns, it is safe to delete the *nva*.
+    
+    This function returns the number of bytes written to *vec* if it
+    succeeds, or one of the following negative error codes:
+    
+    :macro:`nghttp2_error.NGHTTP2_ERR_NOMEM`
+        Out of memory.
+    :macro:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`
+        Deflation process has failed.
+    :macro:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`
+        The provided *buflen* size is too small to hold the output.