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Diffstat (limited to 'iconvdata/unicode.c')
| -rw-r--r-- | iconvdata/unicode.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/iconvdata/unicode.c b/iconvdata/unicode.c new file mode 100644 index 0000000..b29976b --- /dev/null +++ b/iconvdata/unicode.c @@ -0,0 +1,190 @@ +/* Conversion module for Unicode + Copyright (C) 1999, 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. + + 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 <byteswap.h> +#include <gconv.h> +#include <stddef.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + +/* This is the Byte Order Mark character (BOM). */ +#define BOM 0xfeff +/* And in the other endian format. */ +#define BOM_OE 0xfffe + + +/* Definitions used in the body of the `gconv' function. */ +#define FROM_LOOP from_unicode_loop +#define TO_LOOP to_unicode_loop +#define DEFINE_INIT 0 +#define DEFINE_FINI 0 +#define MIN_NEEDED_FROM 2 +#define MIN_NEEDED_TO 4 +#define FROM_DIRECTION (dir == from_unicode) +#define PREPARE_LOOP \ + enum direction dir = ((struct unicode_data *) step->__data)->dir; \ + int swap; \ + if (FROM_DIRECTION) \ + { \ + if (data->__invocation_counter == 0) \ + { \ + /* We have to find out which byte order the file is encoded in. */ \ + if (inptr + 2 > inbufend) \ + return __GCONV_EMPTY_INPUT; \ + \ + if (*(uint16_t *) inptr == BOM) \ + /* Simply ignore the BOM character. */ \ + inptr += 2; \ + else if (*(uint16_t *) inptr == BOM_OE) \ + { \ + ((struct unicode_data *) step->__data)->swap = 1; \ + inptr += 2; \ + } \ + } \ + } \ + else if (!data->__internal_use && data->__invocation_counter == 0) \ + { \ + /* Emit the Byte Order Mark. */ \ + if (outbuf + 2 > outend) \ + return __GCONV_FULL_OUTPUT; \ + \ + *(uint16_t *) outbuf = BOM; \ + outbuf += 2; \ + } \ + swap = ((struct unicode_data *) step->__data)->swap; +#define EXTRA_LOOP_ARGS , data, swap + + +/* Direction of the transformation. */ +enum direction +{ + illegal_dir, + to_unicode, + from_unicode +}; + +struct unicode_data +{ + enum direction dir; + int swap; +}; + + +int +gconv_init (struct __gconv_step *step) +{ + /* Determine which direction. */ + struct unicode_data *new_data; + enum direction dir = illegal_dir; + int result; + + if (__strcasecmp (step->__from_name, "UNICODE") == 0) + dir = from_unicode; + else + dir = to_unicode; + + new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data)); + + result = __GCONV_NOMEM; + if (new_data != NULL) + { + new_data->dir = dir; + new_data->swap = 0; + step->__data = new_data; + + if (dir == from_unicode) + { + step->__min_needed_from = MIN_NEEDED_FROM; + step->__max_needed_from = MIN_NEEDED_FROM; + step->__min_needed_to = MIN_NEEDED_TO; + step->__max_needed_to = MIN_NEEDED_TO; + } + else + { + step->__min_needed_from = MIN_NEEDED_TO; + step->__max_needed_from = MIN_NEEDED_TO; + step->__min_needed_to = MIN_NEEDED_FROM; + step->__max_needed_to = MIN_NEEDED_FROM; + } + + step->__stateful = 0; + + result = __GCONV_OK; + } + + return result; +} + + +void +gconv_end (struct __gconv_step *data) +{ + free (data->__data); +} + + +/* Convert from the internal (UCS4-like) format to UCS2. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_TO +#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM +#define LOOPFCT TO_LOOP +#define BODY \ + { \ + uint32_t c = *((uint32_t *) inptr); \ + \ + if (c >= 0x10000) \ + { \ + result = __GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + \ + *((uint16_t *) outptr) = c; \ + \ + outptr += 2; \ + inptr += 4; \ + } +#define EXTRA_LOOP_DECLS \ + , struct __gconv_step_data *step_data, int swap +#include <iconv/loop.c> + + +/* Convert from UCS2 to the internal (UCS4-like) format. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_FROM +#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO +#define LOOPFCT FROM_LOOP +#define BODY \ + { \ + uint16_t u1 = *(uint16_t *) inptr; \ + \ + if (swap) \ + u1 = bswap_16 (u1); \ + \ + *((uint32_t *) outptr) = u1; \ + \ + inptr += 2; \ + outptr += 4; \ + } +#define EXTRA_LOOP_DECLS \ + , struct __gconv_step_data *step_data, int swap +#include <iconv/loop.c> + + +/* Now define the toplevel functions. */ +#include <iconv/skeleton.c> |