328 lines
10 KiB
C
328 lines
10 KiB
C
/*
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* Copyright (c) 2003-2004, Artem B. Bityuckiy
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* Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __ICONV_UCS_CONVERSION_H__
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#define __ICONV_UCS_CONVERSION_H__
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#include <_ansi.h>
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#include <reent.h>
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#include <sys/types.h>
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#include <wchar.h>
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#include "local.h"
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/* No enough space in output buffer */
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#define ICONV_CES_NOSPACE 0
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/* Invalid input character */
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#define ICONV_CES_INVALID_CHARACTER -1
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/* No corespondent character in destination encoding */
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#define ICONV_CES_BAD_SEQUENCE -2
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/* All unknown characters are marked by this code */
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#define DEFAULT_CHARACTER 0x3f /* ASCII '?' */
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/*
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* iconv_to_ucs_ces_handlers_t - "to UCS" CES converter handlers.
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*
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* Structure contains function pointers which should be provided by
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* "to_ucs" CES converter.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/*
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* init - initialize CES converter.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of current thread/process;
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* const char *encoding - encoding name.
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*
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* DESCRIPTION:
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* Initializes CES converter. CES converter may deal with a series of
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* encodings, such as Table or EUC CES converters. 'encoding' parameter
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* indicates which encoding CES converter should use.
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*
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* RETURN:
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* Returns CES-specific data pointer if success. In case of error returns
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* NULL and sets current thread's/process's errno.
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*/
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void *(*init) (struct _reent *rptr,
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const char *encoding);
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/*
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* close - close CES converter.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of current thread/process;
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* void *data - CES converter-specific data.
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*
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* DESCRIPTION:
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* Preforms CES converter closing. *
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* RETURN:
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* Returns (size_t)0 if success. In case of error returns (size_t)-1 and
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* sets current thread's/process's errno.
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*/
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size_t (*close) (struct _reent *rptr,
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void *data);
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/*
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* get_mb_cur_max - get maximum character length in bytes.
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*
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* PARAMETERS:
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* void *data - conversion-specific data;
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*
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* DESCRIPTION:
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* Returns encoding's maximum character length.
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*/
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int (*get_mb_cur_max) (void *data);
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/*
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* get_state - get current shift state.
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*
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* PARAMETERS:
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* void *data - conversion-specific data;
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* mbstate_t *state - mbstate_t object where shift state will be stored;
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*
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* DESCRIPTION:
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* Returns encoding's current shift sequence.
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*/
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void (*get_state) (void *data,
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mbstate_t *state);
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/*
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* set_state - set shift state.
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*
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* PARAMETERS:
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* void *data - conversion-specific data;
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* mbstate_t *state - mbstate_t value to which shift state will be set.
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*
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* DESCRIPTION:
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* Sets encoding's current shift state to 'state'. if 'state'
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* object is zero-object - reset current shift state.
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* Returns 0 if '*state' object has right format, -1 else.
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*/
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int (*set_state) (void *data,
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mbstate_t *state);
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/*
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* is_stateful - is encoding stateful state.
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*
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* PARAMETERS:
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* void *data - conversion-specific data;
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*
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* DESCRIPTION:
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* Returns 0 if encoding is stateless, else returns 1.
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*/
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int (*is_stateful) (void *data);
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/*
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* convert_to_ucs - convert character to UCS.
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*
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* PARAMETERS:
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* void *data - CES converter-specific data;
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* const unsigned char **inbuf - buffer with input character byte sequence;
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* size_t *inbytesleft - output buffer bytes count.
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*
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* DESCRIPTION:
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* Converts input characters into UCS encoding. 'inbuf' is
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* incremented accordingly. 'bytesleft' is decremented accordingly. Should
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* be provided by correspondent CES module.
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*
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* RETURN:
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* Returns resulting UCS code if success. If input character is invalid,
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* returns ICONV_CES_INVALID_CHARACTER. If invalid or incomplete bytes
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* sequence was met, returns ICONV_CES_BAD_SEQUENCE.
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*/
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ucs4_t (*convert_to_ucs) (void *data,
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const unsigned char **inbuf,
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size_t *inbytesleft);
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} iconv_to_ucs_ces_handlers_t;
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/*
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* iconv_from_ucs_ces_handlers_t - "from UCS" CES converter handlers.
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*
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* Structure contains function pointers which should be provided by
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* "from_ucs" CES converter.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/* Same as in iconv_to_ucs_ces_handlers_t */
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void *(*init) (struct _reent *rptr,
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const char *encoding);
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/* Same as in iconv_to_ucs_ces_handlers_t */
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size_t (*close) (struct _reent *rptr,
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void *data);
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/* Same as in iconv_to_ucs_ces_handlers_t */
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int (*get_mb_cur_max) (void *data);
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/* Same as in iconv_to_ucs_ces_handlers_t */
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void (*get_state) (void *data,
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mbstate_t *state);
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/* Same as in iconv_to_ucs_ces_handlers_t */
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int (*set_state) (void *data,
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mbstate_t *state);
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/* Same as in iconv_to_ucs_ces_handlers_t */
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int (*is_stateful) (void *data);
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/*
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* convert_from_ucs - convert UCS character to destination encoding.
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*
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* PARAMETERS:
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* void *data - CES converter-specific data;
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* ucs4_t in - input UCS-4 character;
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* unsigned char **outbuf - output buffer for the result;
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* size_t *outbytesleft - output buffer bytes count.
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*
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* DESCRIPTION:
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* Converts input UCS characters to destination encoding and stores result
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* in 'outbuf' if there is sufficient free space present. 'outbuf' is
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* incremented accordingly. 'outbytesleft' is decremented accordingly. Should
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* be provided by correspondent CES module.
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* Output buffer always has at least 1 byte.
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*
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* RETURN:
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* Returns number of bytes that was written into output buffer if success.
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* If there is no enough space in output buffer, returns ICONV_CES_NOSPACE.
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* If there is no corresponding character in destination encoding, returns
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* ICONV_CES_INVALID_CHARACTER.
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*/
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size_t (*convert_from_ucs) (void *data,
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ucs4_t in,
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unsigned char **outbuf,
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size_t *outbytesleft);
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} iconv_from_ucs_ces_handlers_t;
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/*
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* iconv_to_ucs_ces_desc_t - "to UCS" CES converter definition structure for
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* usage in iconv_ucs_conversion_t conversion description structure.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/* CES converter handlers */
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const iconv_to_ucs_ces_handlers_t *handlers;
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/* "to_ucs" CES converter-specific data. */
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void *data;
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} iconv_to_ucs_ces_desc_t;
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/*
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* iconv_from_ucs_ces_desc_t - "from UCS" CES converter definition structure for
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* usage in iconv_ucs_conversion_t conversion description structure.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/* CES converter handlers */
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const iconv_from_ucs_ces_handlers_t *handlers;
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/* "from_ucs" CES converter-specific data. */
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void *data;
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} iconv_from_ucs_ces_desc_t;
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/*
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* iconv_ucs_conversion_t - UCS-based conversion definition structure.
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*
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* Defines special type of conversion where every character is first
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* converted into UCS-4 (UCS-2 for table-driven), and after this the
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* resulting UCS character is converted to destination encoding.
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* UCS-based conversion is composed of two *converters*, defined by
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* iconv_ces_t structure. The iconv_ucs_conversion_t object is referred
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* from iconv_conversion_t object using 'data' field.
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*
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* Structure contains two objects - 'to_ucs' and 'from_ucs' which define
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* "source encoding to UCS" and "UCS to destination encoding" converters.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/* Source encoding -> CES converter. */
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iconv_to_ucs_ces_desc_t to_ucs;
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/* UCS -> destination encoding CES converter. */
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iconv_from_ucs_ces_desc_t from_ucs;
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} iconv_ucs_conversion_t;
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/*
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* iconv_to_ucs_ces_t - defines "to UCS" CES converter.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/*
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* An array of encodings names, supported by CES converter.
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* The end of array should be marked by NULL pointer.
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*/
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const char **names;
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/* CES converter description structure */
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const iconv_to_ucs_ces_handlers_t *handlers;
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} iconv_to_ucs_ces_t;
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/*
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* iconv_from_ucs_ces_t - defines "from UCS" CES converter.
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*
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* ============================================================================
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*/
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typedef struct
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{
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/*
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* An array of encodings names, supported by CES converter.
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* The end of array should be marked by NULL pointer.
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*/
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const char **names;
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/* CES converter description structure */
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const iconv_from_ucs_ces_handlers_t *handlers;
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} iconv_from_ucs_ces_t;
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/* List of "to UCS" linked-in CES converters. */
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extern const iconv_to_ucs_ces_t
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_iconv_to_ucs_ces[];
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/* List of "from UCS" linked-in CES converters. */
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extern const iconv_from_ucs_ces_t
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_iconv_from_ucs_ces[];
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#endif /* !__ICONV_UCS_CONVERSION_H__ */
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