mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
215 lines
8.6 KiB
C
215 lines
8.6 KiB
C
/* 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 */
|