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+/* punycode.h --- Declarations for punycode functions.
+ * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007  Simon Josefsson
+ *
+ * This file is part of GNU Libidn.
+ *
+ * GNU Libidn is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * GNU Libidn is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GNU Libidn; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ */
+
+/*
+ * This file is derived from RFC 3492bis written by Adam M. Costello.
+ *
+ * Disclaimer and license: Regarding this entire document or any
+ * portion of it (including the pseudocode and C code), the author
+ * makes no guarantees and is not responsible for any damage resulting
+ * from its use.  The author grants irrevocable permission to anyone
+ * to use, modify, and distribute it in any way that does not diminish
+ * the rights of anyone else to use, modify, and distribute it,
+ * provided that redistributed derivative works do not contain
+ * misleading author or version information.  Derivative works need
+ * not be licensed under similar terms.
+ *
+ * Copyright (C) The Internet Society (2003).  All Rights Reserved.
+ *
+ * This document and translations of it may be copied and furnished to
+ * others, and derivative works that comment on or otherwise explain it
+ * or assist in its implementation may be prepared, copied, published
+ * and distributed, in whole or in part, without restriction of any
+ * kind, provided that the above copyright notice and this paragraph are
+ * included on all such copies and derivative works.  However, this
+ * document itself may not be modified in any way, such as by removing
+ * the copyright notice or references to the Internet Society or other
+ * Internet organizations, except as needed for the purpose of
+ * developing Internet standards in which case the procedures for
+ * copyrights defined in the Internet Standards process must be
+ * followed, or as required to translate it into languages other than
+ * English.
+ *
+ * The limited permissions granted above are perpetual and will not be
+ * revoked by the Internet Society or its successors or assigns.
+ *
+ * This document and the information contained herein is provided on an
+ * "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
+ * TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
+ * HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef _PUNYCODE_H
+#define _PUNYCODE_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stddef.h>		/* size_t */
+#include <idn-int.h>		/* uint32_t */
+
+  enum punycode_status
+  {
+    punycode_success = 0,
+    punycode_bad_input = 1,	/* Input is invalid.                       */
+    punycode_big_output = 2,	/* Output would exceed the space provided. */
+    punycode_overflow = 3	/* Wider integers needed to process input. */
+  };
+
+  typedef enum
+  {
+    PUNYCODE_SUCCESS = punycode_success,
+    PUNYCODE_BAD_INPUT = punycode_bad_input,
+    PUNYCODE_BIG_OUTPUT = punycode_big_output,
+    PUNYCODE_OVERFLOW = punycode_overflow
+  } Punycode_status;
+
+  extern const char *punycode_strerror (Punycode_status rc);
+
+/* punycode_uint needs to be unsigned and needs to be */
+/* at least 26 bits wide.                             */
+
+  typedef uint32_t punycode_uint;
+
+  extern int punycode_encode (size_t input_length,
+			      const punycode_uint input[],
+			      const unsigned char case_flags[],
+			      size_t * output_length, char output[]);
+
+/*
+    punycode_encode() converts a sequence of code points (presumed to be
+    Unicode code points) to Punycode.
+
+    Input arguments (to be supplied by the caller):
+
+        input_length
+            The number of code points in the input array and the number
+            of flags in the case_flags array.
+
+        input
+            An array of code points.  They are presumed to be Unicode
+            code points, but that is not strictly REQUIRED.  The
+            array contains code points, not code units.  UTF-16 uses
+            code units D800 through DFFF to refer to code points
+            10000..10FFFF.  The code points D800..DFFF do not occur in
+            any valid Unicode string.  The code points that can occur in
+            Unicode strings (0..D7FF and E000..10FFFF) are also called
+            Unicode scalar values.
+
+        case_flags
+            A null pointer or an array of boolean values parallel to
+            the input array.  Nonzero (true, flagged) suggests that the
+            corresponding Unicode character be forced to uppercase after
+            being decoded (if possible), and zero (false, unflagged)
+            suggests that it be forced to lowercase (if possible).
+            ASCII code points (0..7F) are encoded literally, except that
+            ASCII letters are forced to uppercase or lowercase according
+            to the corresponding case flags.  If case_flags is a null
+            pointer then ASCII letters are left as they are, and other
+            code points are treated as unflagged.
+
+    Output arguments (to be filled in by the function):
+
+        output
+            An array of ASCII code points.  It is *not* null-terminated;
+            it will contain zeros if and only if the input contains
+            zeros.  (Of course the caller can leave room for a
+            terminator and add one if needed.)
+
+    Input/output arguments (to be supplied by the caller and overwritten
+    by the function):
+
+        output_length
+            The caller passes in the maximum number of ASCII code points
+            that it can receive.  On successful return it will contain
+            the number of ASCII code points actually output.
+
+    Return value:
+
+        Can be any of the punycode_status values defined above except
+        punycode_bad_input.  If not punycode_success, then output_size
+        and output might contain garbage.
+*/
+
+  extern int punycode_decode (size_t input_length,
+			      const char input[],
+			      size_t * output_length,
+			      punycode_uint output[],
+			      unsigned char case_flags[]);
+
+/*
+    punycode_decode() converts Punycode to a sequence of code points
+    (presumed to be Unicode code points).
+
+    Input arguments (to be supplied by the caller):
+
+        input_length
+            The number of ASCII code points in the input array.
+
+        input
+            An array of ASCII code points (0..7F).
+
+    Output arguments (to be filled in by the function):
+
+        output
+            An array of code points like the input argument of
+            punycode_encode() (see above).
+
+        case_flags
+            A null pointer (if the flags are not needed by the caller)
+            or an array of boolean values parallel to the output array.
+            Nonzero (true, flagged) suggests that the corresponding
+            Unicode character be forced to uppercase by the caller (if
+            possible), and zero (false, unflagged) suggests that it
+            be forced to lowercase (if possible).  ASCII code points
+            (0..7F) are output already in the proper case, but their
+            flags will be set appropriately so that applying the flags
+            would be harmless.
+
+    Input/output arguments (to be supplied by the caller and overwritten
+    by the function):
+
+        output_length
+            The caller passes in the maximum number of code points
+            that it can receive into the output array (which is also
+            the maximum number of flags that it can receive into the
+            case_flags array, if case_flags is not a null pointer).  On
+            successful return it will contain the number of code points
+            actually output (which is also the number of flags actually
+            output, if case_flags is not a null pointer).  The decoder
+            will never need to output more code points than the number
+            of ASCII code points in the input, because of the way the
+            encoding is defined.  The number of code points output
+            cannot exceed the maximum possible value of a punycode_uint,
+            even if the supplied output_length is greater than that.
+
+    Return value:
+
+        Can be any of the punycode_status values defined above.  If not
+        punycode_success, then output_length, output, and case_flags
+        might contain garbage.
+*/
+
+#ifdef __cplusplus
+}
+#endif
+#endif				/* _PUNYCODE_H */