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+#ifndef HEADER_CURL_CONTENT_ENCODING_H
+#define HEADER_CURL_CONTENT_ENCODING_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+struct contenc_writer {
+  const struct content_encoding *handler;  /* Encoding handler. */
+  struct contenc_writer *downstream;  /* Downstream writer. */
+  void *params;  /* Encoding-specific storage (variable length). */
+};
+
+/* Content encoding writer. */
+struct content_encoding {
+  const char *name;        /* Encoding name. */
+  const char *alias;       /* Encoding name alias. */
+  CURLcode (*init_writer)(struct Curl_easy *data,
+                          struct contenc_writer *writer);
+  CURLcode (*unencode_write)(struct Curl_easy *data,
+                             struct contenc_writer *writer,
+                             const char *buf, size_t nbytes);
+  void (*close_writer)(struct Curl_easy *data,
+                       struct contenc_writer *writer);
+  size_t paramsize;
+};
+
+
+CURLcode Curl_build_unencoding_stack(struct Curl_easy *data,
+                                     const char *enclist, int maybechunked);
+CURLcode Curl_unencode_write(struct Curl_easy *data,
+                             struct contenc_writer *writer,
+                             const char *buf, size_t nbytes);
+void Curl_unencode_cleanup(struct Curl_easy *data);
+char *Curl_all_content_encodings(void);
+
+#endif /* HEADER_CURL_CONTENT_ENCODING_H */