File: punycode.h

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/* punycode.h	Declarations for punycode functions.
 * Copyright (C) 2002, 2003  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, see <http://www.gnu.org/licenses/>.
 */

/*
 * 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 <stdint.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;

/* 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 */