/* Conversions between Unicode and legacy encodings.
   Copyright (C) 2002, 2005, 2007, 2009-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifndef _UNICONV_H
#define _UNICONV_H

/* Get size_t.  */
#include <stddef.h>

#include "unitypes.h"

/* Get enum iconv_ilseq_handler.  */
#include <unistring/iconveh.h>

/* Get locale_charset() declaration.  */
#include <unistring/localcharset.h>


#ifdef __cplusplus
extern "C" {
#endif


/* Converts an entire string, possibly including NUL bytes, from one encoding
   to a Unicode encoding.
   Converts a memory region given in encoding FROMCODE.  FROMCODE is as for
   iconv_open(3).
   The input is in the memory region between SRC (inclusive) and SRC + SRCLEN
   (exclusive).
   If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this
   array is filled with offsets into the result, i.e. the character starting
   at SRC[i] corresponds to the character starting at (*RESULTP)[OFFSETS[i]],
   and other offsets are set to (size_t)(-1).
   RESULTBUF and *LENGTHP should initially be a scratch buffer and its size,
   or *RESULTBUF can be NULL.
   May erase the contents of the memory at RESULTBUF.
   If successful: The resulting Unicode string (non-NULL) is returned and its
   length stored in *LENGTHP.  The resulting string is RESULTBUF if no dynamic
   memory allocation was necessary, or a freshly allocated memory block
   otherwise.
   In case of error: NULL is returned and errno is set.  Particular errno
   values: EINVAL, EILSEQ, ENOMEM.  */
extern uint8_t *
       u8_conv_from_encoding (const char *fromcode,
                              enum iconv_ilseq_handler handler,
                              const char *src, size_t srclen,
                              size_t *offsets,
                              uint8_t *resultbuf, size_t *lengthp);
extern uint16_t *
       u16_conv_from_encoding (const char *fromcode,
                               enum iconv_ilseq_handler handler,
                               const char *src, size_t srclen,
                               size_t *offsets,
                               uint16_t *resultbuf, size_t *lengthp);
extern uint32_t *
       u32_conv_from_encoding (const char *fromcode,
                               enum iconv_ilseq_handler handler,
                               const char *src, size_t srclen,
                               size_t *offsets,
                               uint32_t *resultbuf, size_t *lengthp);

/* Converts an entire Unicode string, possibly including NUL units, from a
   Unicode encoding to a given encoding.
   Converts a memory region to encoding TOCODE.  TOCODE is as for
   iconv_open(3).
   The input is in the memory region between SRC (inclusive) and SRC + SRCLEN
   (exclusive).
   If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this
   array is filled with offsets into the result, i.e. the character starting
   at SRC[i] corresponds to the character starting at (*RESULTP)[OFFSETS[i]],
   and other offsets are set to (size_t)(-1).
   RESULTBUF and *LENGTHP should initially be a scratch buffer and its size,
   or RESULTBUF can be NULL.
   May erase the contents of the memory at RESULTBUF.
   If successful: The resulting string (non-NULL) is returned and its length
   stored in *LENGTHP.  The resulting string is RESULTBUF if no dynamic memory
   allocation was necessary, or a freshly allocated memory block otherwise.
   In case of error: NULL is returned and errno is set.  Particular errno
   values: EINVAL, EILSEQ, ENOMEM.  */
extern char *
       u8_conv_to_encoding (const char *tocode,
                            enum iconv_ilseq_handler handler,
                            const uint8_t *src, size_t srclen,
                            size_t *offsets,
                            char *resultbuf, size_t *lengthp);
extern char *
       u16_conv_to_encoding (const char *tocode,
                             enum iconv_ilseq_handler handler,
                             const uint16_t *src, size_t srclen,
                             size_t *offsets,
                             char *resultbuf, size_t *lengthp);
extern char *
       u32_conv_to_encoding (const char *tocode,
                             enum iconv_ilseq_handler handler,
                             const uint32_t *src, size_t srclen,
                             size_t *offsets,
                             char *resultbuf, size_t *lengthp);

/* Converts a NUL terminated string from a given encoding.
   The result is malloc allocated, or NULL (with errno set) in case of error.
   Particular errno values: EILSEQ, ENOMEM.  */
extern uint8_t *
       u8_strconv_from_encoding (const char *string,
                                 const char *fromcode,
                                 enum iconv_ilseq_handler handler);
extern uint16_t *
       u16_strconv_from_encoding (const char *string,
                                  const char *fromcode,
                                  enum iconv_ilseq_handler handler);
extern uint32_t *
       u32_strconv_from_encoding (const char *string,
                                  const char *fromcode,
                                  enum iconv_ilseq_handler handler);

/* Converts a NUL terminated string to a given encoding.
   The result is malloc allocated, or NULL (with errno set) in case of error.
   Particular errno values: EILSEQ, ENOMEM.  */
extern char *
       u8_strconv_to_encoding (const uint8_t *string,
                               const char *tocode,
                               enum iconv_ilseq_handler handler);
extern char *
       u16_strconv_to_encoding (const uint16_t *string,
                                const char *tocode,
                                enum iconv_ilseq_handler handler);
extern char *
       u32_strconv_to_encoding (const uint32_t *string,
                                const char *tocode,
                                enum iconv_ilseq_handler handler);

/* Converts a NUL terminated string from the locale encoding.
   The result is malloc allocated, or NULL (with errno set) in case of error.
   Particular errno values: ENOMEM.  */
extern uint8_t *
       u8_strconv_from_locale (const char *string);
extern uint16_t *
       u16_strconv_from_locale (const char *string);
extern uint32_t *
       u32_strconv_from_locale (const char *string);

/* Converts a NUL terminated string to the locale encoding.
   The result is malloc allocated, or NULL (with errno set) in case of error.
   Particular errno values: ENOMEM.  */
extern char *
       u8_strconv_to_locale (const uint8_t *string);
extern char *
       u16_strconv_to_locale (const uint16_t *string);
extern char *
       u32_strconv_to_locale (const uint32_t *string);


#ifdef __cplusplus
}
#endif

#endif /* _UNICONV_H */
