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Diffstat (limited to 'iconvdata/iso-2022-kr.c')
| -rw-r--r-- | iconvdata/iso-2022-kr.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/iconvdata/iso-2022-kr.c b/iconvdata/iso-2022-kr.c new file mode 100644 index 0000000000..16e656a5d3 --- /dev/null +++ b/iconvdata/iso-2022-kr.c @@ -0,0 +1,273 @@ +/* Conversion module for ISO-2022-KR. + Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. + + 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 <stdint.h> +#include <string.h> +#include "ksc5601.h" + +/* This makes obvious what everybody knows: 0x1b is the Esc character. */ +#define SI 0x0f +#define SO 0x0e + +/* Definitions used in the body of the `gconv' function. */ +#define DEFINE_INIT 1 +#define DEFINE_FINI 1 +#define FROM_LOOP from_iso2022kr_loop +#define TO_LOOP to_iso2022kr_loop +#define MIN_NEEDED_FROM 1 +#define MAX_NEEDED_FROM 3 +#define MIN_NEEDED_TO 4 +#define MAX_NEEDED_TO 4 +#define PREPARE_LOOP \ + int save_set; + int set = data->statep->count; + +/* The COUNT element of the state keeps track of the currently selected + character set. The possible values are: */ +enum +{ + ASCII_set = 0, + KSC5601_set +}; + + +/* Since this is a stateful encoding we have to provide code which resets + the output state to the initial state. This has to be done during the + flushing. */ +#define EMIT_SHIFT_TO_INIT \ + if (data->statep->count != 0) \ + { \ + if (step->data == &from_object) \ + /* It's easy, we don't have to emit anything, we just reset the \ + state for the input. */ \ + set = 0; \ + else \ + { \ + char *outbuf = data->outbuf; \ + \ + /* We are not in the initial state. To switch back we have \ + to emit `SO'. */ \ + if (outbuf == data->outbufend) \ + /* We don't have enough room in the output buffer. */ \ + status = GCONV_FULL_OUTPUT; \ + else \ + { \ + /* Write out the shift sequence. */ \ + *outbuf++ = SO; \ + data->outbuf = outbuf; \ + set = 0; \ + } \ + } \ + } + + +/* Since we might have to reset input pointer we must be able to save + and retore the state. */ +#define SAVE_RESET_STATE(Save) \ + if (Save) \ + save_set = set; \ + else \ + set = save_set + + +/* First define the conversion function from ISO-2022-JP to UCS4. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_FROM +#define MAX_NEEDED_INPUT MAX_NEEDED_FROM +#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO +#define LOOPFCT FROM_LOOP +#define BODY \ + { \ + uint32_t ch = *inptr; \ + \ + /* This is a 7bit character set, disallow all 8bit characters. */ \ + if (ch > 0x7f) \ + { \ + result = GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + \ + /* Recognize escape sequences. */ \ + if (ch == ESC) \ + { \ + /* We don't really have to handle escape sequences since all the \ + switching is done using the SI and SO bytes. Butwe have to \ + recognize `Esc $ ) C' since this is a kind of flag for this \ + encoding. We simply ignore it. */ \ + if (inptr + 1 > inend \ + || (inptr[1] == '$' \ + && (inptr + 2 > inend \ + || (inptr[2] == ')' && inptr + 3 > inend)))) \ + \ + { \ + result = GCONV_EMPTY_INPUT; \ + break; \ + } \ + if (inptr[1] == '$' && inptr[2] == ')' && inptr[3] == 'C') \ + { \ + /* Yeah, yeah, we know this is ISO 2022-KR. */ \ + inptr += 4; \ + continue; \ + } \ + } \ + else if (ch == SI) \ + { \ + /* Switch to use KSC. */ \ + ++inptr; \ + set = KSC5601_set; \ + continue; \ + } \ + else if (ch == SO) \ + { \ + /* Switch to use ASCII. */ \ + ++inptr; \ + set = ASCII_set; \ + continue; \ + } \ + \ + if (set == ASCII_set || ch < 0x21 || ch == 0x7f) \ + /* Almost done, just advance the input pointer. */ \ + ++inptr; \ + else \ + { \ + assert (set == KSC5601_set); \ + \ + /* Use the KSC 5601 table. */ \ + ch = ksc5601_to_ucs4 (&inptr, \ + NEED_LENGTH_TEST ? inend - inptr : 2, 0); \ + \ + if (NEED_LENGTH_TEST && ch == 0) \ + { \ + result = GCONV_EMPTY_INPUT; \ + break; \ + } \ + else if (ch == UNKNOWN_10646_CHAR) \ + { \ + result = GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + } \ + \ + *((uint32_t *) outptr)++ = ch; \ + } +#define EXTRA_LOOP_DECLS , int set +#include <iconv/loop.c> + + +/* Next, define the other direction. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_TO +#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM +#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM +#define LOOPFCT TO_LOOP +#define BODY \ + { \ + unsigned char ch; \ + size_t written = 0; \ + \ + ch = *((uint32_t *) inptr); \ + \ + /* First see whether we can write the character using the currently \ + selected character set. */ \ + if (set == ASCII_set || (ch >= 0x01 && (ch < 0x21 || ch == 0x7f))) \ + { \ + /* Please note that the NUL byte is *not* matched if we are not \ + currently using the ASCII charset. This is because we must \ + switch to the initial state whenever a NUL byte is written. */ \ + if (ch <= 0x7f) \ + { \ + *outptr++ = ch; \ + written = 1; \ + } \ + } \ + else \ + { \ + assert (set == KSC5601_set); \ + \ + written = ucs4_to_ksc5601 (ch, outptr, \ + (NEED_LENGTH_TEST ? outend - outptr : 2)); \ + \ + if (NEED_LENGTH_TEST && written == 0) \ + { \ + result = GCONV_FULL_OUTPUT; \ + break; \ + } \ + if (written == UNKNOWN_10646_CHAR) \ + { \ + /* Either this is an unknown character or we have to switch \ + the currently selected character set. The character sets \ + do not code entirely separate parts of ISO 10646 and \ + therefore there is no single correct result. If we choose \ + the character set to use wrong we might be end up with \ + using yet another character set for the next character \ + though the current and the next could be encoded with one \ + character set. We leave this kind of optimization for \ + later and now simply use a fixed order in which we test for \ + availability */ \ + \ + if (ch <= 0x7f) \ + { \ + /* We must encode using ASCII. First write out the \ + escape sequence. */ \ + *outptr++ = SO; \ + set = ASCII_set; \ + \ + if (NEED_LENGTH_TEST && outptr == outend) \ + { \ + result = GCONV_FULL_OUTPUT; \ + break; \ + } \ + \ + *outptr++ = ch; \ + } \ + else \ + { \ + written = ucs4_to_ksc5601 (ch, buf, 2); \ + if (written != UNKNOWN_10646_CHAR) \ + { \ + /* We use KSC 5601. */ \ + *outptr++ = SI; \ + set = KSC5601_set; \ + \ + if (NEED_LENGTH_TEST && outptr + 2 > outend) \ + { \ + result = GCONV_FULL_OUTPUT; \ + break; \ + } \ + \ + *outptr++ = buf[0]; \ + *outptr++ = buf[1]; \ + } \ + else \ + { \ + result = GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + } \ + } \ + \ + /* Now that we wrote the output increment the input pointer. */ \ + inptr += 4; \ + } +#define EXTRA_LOOP_DECLS , int set +#include <iconv/loop.c> + + +/* Now define the toplevel functions. */ +#include <iconv/skeleton.c> |