diff options
Diffstat (limited to 'iconv/gconv_simple.c')
| -rw-r--r-- | iconv/gconv_simple.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/iconv/gconv_simple.c b/iconv/gconv_simple.c new file mode 100644 index 0000000000..91a347b058 --- /dev/null +++ b/iconv/gconv_simple.c @@ -0,0 +1,240 @@ +/* Simple transformations functions. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <gconv.h> +#include <stdlib.h> +#include <string.h> +#include <wchar.h> +#include <sys/param.h> + + +int +__gconv_transform_dummy (struct gconv_step *step, struct gconv_step_data *data, + const char *inbuf, size_t *inlen, size_t *written, + int do_flush) +{ + size_t do_write; + + /* We have no stateful encoding. So we don't have to do anything + special. */ + if (do_flush) + do_write = 0; + else + { + do_write = MIN (*inlen, data->outbufsize - data->outbufavail); + + memcpy (data->outbuf, inbuf, do_write); + + *inlen -= do_write; + data->outbufavail += do_write; + } + + /* ### TODO Actually, this number must be devided according to the + size of the input charset. I.e., if the input is in UCS4 the + number of copied bytes must be divided by 4. */ + if (written != NULL) + *written = do_write; + + return GCONV_OK; +} + + +int +__gconv_transform_init_rstate (struct gconv_step *step, + struct gconv_step_data *data) +{ + /* We have to provide the transformation function an correctly initialized + object of type `mbstate_t'. This must be dynamically allocated. */ + data->data = calloc (1, sizeof (mbstate_t)); + + return data->data == NULL ? GCONV_NOMEM : GCONV_OK; +} + + +void +__gconv_transform_end_rstate (struct gconv_step_data *data) +{ + if (data->data != NULL) + free (data->data); +} + + +int +__gconv_transform_ucs4_utf8 (struct gconv_step *step, + struct gconv_step_data *data, const char *inbuf, + size_t *inlen, size_t *written, int do_flush) +{ + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + gconv_fct fct = next_step->fct; + size_t do_write; + int result; + + /* If the function is called with no input this means we have to reset + to the initial state. The possibly partly converted input is + dropped. */ + if (do_flush) + { + /* Clear the state. */ + memset (data->data, '\0', sizeof (mbstate_t)); + do_write = 0; + + /* Call the steps down the chain if there are any. */ + if (data->is_last) + result = GCONV_OK; + else + { + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + + result = (*fct) (next_step, next_data, NULL, 0, written, 1); + + /* Clear output buffer. */ + data->outbufavail = 0; + } + } + else + { + do_write = 0; + + do + { + const char *newinbuf = inbuf; + size_t actually = __wcsnrtombs (&data->outbuf[data->outbufavail], + (const wchar_t **) &newinbuf, + *inlen / sizeof (wchar_t), + data->outbufsize - data->outbufavail, + (mbstate_t *) data->data); + + /* Status so far. */ + result = GCONV_EMPTY_INPUT; + + /* Remember how much we converted. */ + do_write += newinbuf - inbuf; + *inlen -= (newinbuf - inbuf) * sizeof (wchar_t); + + data->outbufavail += actually; + if (data->outbufavail > 0) + { + /* Call the functions below in the chain. */ + size_t newavail = data->outbufavail; + + result = (*fct) (next_step, next_data, data->outbuf, &newavail, + written, 0); + + /* Correct the output buffer. */ + if (newavail != data->outbufavail) + { + memmove (data->outbuf, + &data->outbuf[data->outbufavail - newavail], + newavail); + data->outbufavail = newavail; + } + } + } + while (*inlen > 0 && result == GCONV_EMPTY_INPUT); + } + + if (written != NULL && data->is_last) + *written = do_write / sizeof (wchar_t); + + return result; +} + + +int +__gconv_transform_utf8_ucs4 (struct gconv_step *step, + struct gconv_step_data *data, const char *inbuf, + size_t *inlen, size_t *written, int do_flush) +{ + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + gconv_fct fct = next_step->fct; + size_t do_write; + int result; + + /* If the function is called with no input this means we have to reset + to the initial state. The possibly partly converted input is + dropped. */ + if (do_flush) + { + /* Clear the state. */ + memset (data->data, '\0', sizeof (mbstate_t)); + do_write = 0; + + /* Call the steps down the chain if there are any. */ + if (data->is_last) + result = GCONV_OK; + else + { + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + + result = (*fct) (next_step, next_data, NULL, 0, written, 1); + } + } + else + { + do_write = 0; + + do + { + const char *newinbuf = inbuf; + size_t actually = __mbsnrtowcs ((wchar_t *) &data->outbuf[data->outbufavail], + &newinbuf, *inlen, + ((data->outbufsize + - data->outbufavail) + / sizeof (wchar_t)), + (mbstate_t *) data->data); + + /* Status so far. */ + result = GCONV_EMPTY_INPUT; + + /* Remember how much we converted. */ + do_write += actually; + *inlen -= newinbuf - inbuf; + + data->outbufavail += actually * sizeof (wchar_t); + if (data->outbufavail > 0) + { + /* Call the functions below in the chain. */ + size_t newavail = data->outbufavail; + + result = (*fct) (next_step, next_data, data->outbuf, &newavail, + written, 0); + + /* Correct the output buffer. */ + if (newavail != data->outbufavail) + { + memmove (data->outbuf, + &data->outbuf[data->outbufavail - newavail], + newavail); + data->outbufavail = newavail; + } + } + } + while (*inlen > 0 && result == GCONV_EMPTY_INPUT); + } + + if (written != NULL && data->is_last) + *written = do_write; + + return GCONV_OK; +} |