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430 lines
15 KiB
C
430 lines
15 KiB
C
/* Conversion module for ISO-2022-CN.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <gconv.h>
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#include <stdint.h>
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#include <string.h>
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#include "gb2312.h"
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#include "cns11643l1.h"
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#include "cns11643l2.h"
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#include <assert.h>
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/* This makes obvious what everybody knows: 0x1b is the Esc character. */
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#define ESC 0x1b
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/* We have single-byte shift-in and shift-out sequences, and the single
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shift sequence SS2 which replaces the SS2 designation for the next
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two bytes. */
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#define SI 0x0f
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#define SO 0x0e
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#define SS2_0 ESC
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#define SS2_1 0x4e
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/* Definitions used in the body of the `gconv' function. */
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#define CHARSET_NAME "ISO-2022-CN//"
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#define DEFINE_INIT 1
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#define DEFINE_FINI 1
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#define FROM_LOOP from_iso2022cn_loop
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#define TO_LOOP to_iso2022cn_loop
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 4
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#define MIN_NEEDED_TO 4
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#define MAX_NEEDED_TO 4
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#define PREPARE_LOOP \
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int save_set; \
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int *setp = &data->__statep->__count;
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#define EXTRA_LOOP_ARGS , setp
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/* The COUNT element of the state keeps track of the currently selected
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character set. The possible values are: */
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enum
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{
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ASCII_set = 0,
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GB2312_set = 8,
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CNS11643_1_set = 16,
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CNS11643_2_set = 24,
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CURRENT_SEL_MASK = 24,
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GB2312_ann = 32,
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CNS11643_1_ann = 64,
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CNS11643_2_ann = 128,
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CURRENT_ANN_MASK = 224
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};
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/* Since this is a stateful encoding we have to provide code which resets
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the output state to the initial state. This has to be done during the
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flushing. */
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#define EMIT_SHIFT_TO_INIT \
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if (data->__statep->__count != ASCII_set) \
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{ \
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if (FROM_DIRECTION) \
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/* It's easy, we don't have to emit anything, we just reset the \
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state for the input. */ \
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data->__statep->__count = ASCII_set; \
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else \
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{ \
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unsigned char *outbuf = data->__outbuf; \
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\
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/* We are not in the initial state. To switch back we have \
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to emit `SI'. */ \
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if (__builtin_expect (outbuf == data->__outbufend, 0)) \
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/* We don't have enough room in the output buffer. */ \
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status = __GCONV_FULL_OUTPUT; \
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else \
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{ \
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/* Write out the shift sequence. */ \
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*outbuf++ = SI; \
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data->__outbuf = outbuf; \
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data->__statep->__count = ASCII_set; \
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} \
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} \
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}
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/* Since we might have to reset input pointer we must be able to save
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and retore the state. */
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#define SAVE_RESET_STATE(Save) \
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if (Save) \
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save_set = *setp; \
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else \
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*setp = save_set
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/* First define the conversion function from ISO-2022-CN to UCS4. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch = *inptr; \
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\
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/* This is a 7bit character set, disallow all 8bit characters. */ \
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if (__builtin_expect (ch, 0) > 0x7f) \
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{ \
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if (! ignore_errors_p ()) \
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{ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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++inptr; \
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++*converted; \
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continue; \
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} \
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\
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/* Recognize escape sequences. */ \
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if (__builtin_expect (ch, 0) == ESC) \
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{ \
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/* There are two kinds of escape sequences we have to handle: \
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- those announcing the use of GB and CNS characters on the \
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line; we can simply ignore them \
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- the initial byte of the SS2 sequence. \
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*/ \
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if (NEED_LENGTH_TEST \
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&& (__builtin_expect (inptr + 1 > inend, 0) \
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|| (inptr[1] == '$' \
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&& (__builtin_expect (inptr + 2 > inend, 0) \
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|| (inptr[2] == ')' \
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&& __builtin_expect (inptr + 3 > inend, 0)) \
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|| (inptr[2] == '*' \
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&& __builtin_expect (inptr + 3 > inend, 0)))) \
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|| (inptr[1] == SS2_1 \
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&& __builtin_expect (inptr + 3 > inend, 0)))) \
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{ \
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result = __GCONV_EMPTY_INPUT; \
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break; \
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} \
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if (inptr[1] == '$' \
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&& ((inptr[2] == ')' && (inptr[3] == 'A' || inptr[3] == 'G')) \
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|| (inptr[2] == '*' && inptr[3] == 'H'))) \
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{ \
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/* OK, we accept those character sets. */ \
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if (inptr[3] == 'A') \
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ann = GB2312_ann; \
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else if (inptr[3] == 'G') \
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ann = CNS11643_1_ann; \
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inptr += 4; \
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continue; \
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} \
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} \
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else if (__builtin_expect (ch, 0) == SO) \
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{ \
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/* Switch to use GB2312 or CNS 11643 plane 1, depending on which \
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S0 designation came last. The only problem is what to do with \
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faulty input files where no designator came. \
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XXX For now I'll default to use GB2312. If this is not the \
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best behaviour (e.g., we should flag an error) let me know. */ \
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++inptr; \
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set = ann == CNS11643_1_ann ? CNS11643_1_set : GB2312_set; \
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continue; \
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} \
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else if (__builtin_expect (ch, 0) == SI) \
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{ \
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/* Switch to use ASCII. */ \
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++inptr; \
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set = ASCII_set; \
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continue; \
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} \
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\
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if (__builtin_expect (ch, 0) == ESC && inptr[1] == SS2_1) \
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{ \
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/* This is a character from CNS 11643 plane 2. \
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XXX We could test here whether the use of this character \
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set was announced. */ \
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inptr += 2; \
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ch = cns11643l2_to_ucs4 (&inptr, 2, 0); \
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if (__builtin_expect (ch, 0) == __UNKNOWN_10646_CHAR) \
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{ \
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if (! ignore_errors_p ()) \
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{ \
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/* This is an illegal character. */ \
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inptr -= 2; \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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++*converted; \
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continue; \
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} \
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} \
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else if (set == ASCII_set) \
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{ \
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/* Almost done, just advance the input pointer. */ \
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++inptr; \
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} \
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else \
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{ \
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/* That's pretty easy, we have a dedicated functions for this. */ \
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if (set == GB2312_set) \
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ch = gb2312_to_ucs4 (&inptr, \
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NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
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else \
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{ \
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assert (set == CNS11643_1_set); \
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ch = cns11643l1_to_ucs4 (&inptr, \
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NEED_LENGTH_TEST ? inend - inptr : 2, 0);\
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} \
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\
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if (NEED_LENGTH_TEST && __builtin_expect (ch, 1) == 0) \
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{ \
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result = __GCONV_EMPTY_INPUT; \
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break; \
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} \
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else if (__builtin_expect (ch, 1) == __UNKNOWN_10646_CHAR) \
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{ \
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if (! ignore_errors_p ()) \
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{ \
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/* This is an illegal character. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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++inptr; \
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++*converted; \
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continue; \
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} \
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} \
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\
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put32 (outptr, ch); \
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outptr += 4; \
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}
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#define EXTRA_LOOP_DECLS , int *setp
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#define INIT_PARAMS int set = *setp & CURRENT_SEL_MASK; \
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int ann = *setp & CURRENT_ANN_MASK
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#define UPDATE_PARAMS *setp = set | ann
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#include <iconv/loop.c>
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/* Next, define the other direction. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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uint32_t ch = get32 (inptr); \
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\
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/* First see whether we can write the character using the currently \
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selected character set. */ \
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if (ch < 0x80) \
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{ \
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if (set != ASCII_set) \
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{ \
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*outptr++ = SI; \
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set = ASCII_set; \
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if (NEED_LENGTH_TEST && __builtin_expect (outptr == outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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} \
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\
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*outptr++ = ch; \
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\
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/* At the end of the line we have to clear the `ann' flags since \
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every line must contain this information again. */ \
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if (ch == L'\n') \
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ann = 0; \
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} \
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else \
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{ \
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char buf[2]; \
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int used; \
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size_t written = 0; \
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\
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if (set == GB2312_set || (ann & CNS11643_1_ann) == 0) \
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{ \
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written = ucs4_to_gb2312 (ch, buf, 2); \
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used = GB2312_set; \
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} \
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else \
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{ \
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written = ucs4_to_cns11643l1 (ch, buf, 2); \
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used = CNS11643_1_set; \
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} \
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\
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if (written == __UNKNOWN_10646_CHAR) \
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{ \
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/* Cannot convert it using the currently selected SO set. \
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Next try the SS2 set. */ \
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written = ucs4_to_cns11643l2 (ch, buf, 2); \
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if (written != __UNKNOWN_10646_CHAR) \
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/* Yep, that worked. */ \
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used = CNS11643_2_set; \
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else \
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{ \
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/* Well, see whether we have to change the SO set. */ \
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if (set == GB2312_set) \
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written = ucs4_to_cns11643l1 (ch, buf, 2); \
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else \
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written = ucs4_to_gb2312 (ch, buf, 2); \
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\
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if (__builtin_expect (written, 0) != __UNKNOWN_10646_CHAR) \
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/* Oh well, then switch SO. */ \
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used = GB2312_set + CNS11643_1_set - set; \
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else \
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{ \
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/* Even this does not work. Error. */ \
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if (! ignore_errors_p ()) \
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{ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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inptr += 4; \
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++*converted; \
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continue; \
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} \
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} \
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} \
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assert (written == 2); \
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\
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/* See whether we have to emit an escape sequence. */ \
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if (set != used) \
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{ \
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/* First see whether we announced that we use this \
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character set. */ \
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if ((ann & (2 << used)) == 0) \
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{ \
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const char *escseq; \
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\
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if (NEED_LENGTH_TEST \
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&& __builtin_expect (outptr + 4 > outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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assert (used >= 1 && used <= 3); \
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escseq = "\e$)A\e$)G\e$*H" + (used - 1) * 4; \
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*outptr++ = *escseq++; \
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*outptr++ = *escseq++; \
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*outptr++ = *escseq++; \
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*outptr++ = *escseq++; \
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\
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if (used == GB2312_set) \
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ann = (ann & CNS11643_2_ann) | GB2312_ann; \
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else if (used == CNS11643_1_set) \
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ann = (ann & CNS11643_2_ann) | CNS11643_1_ann; \
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else \
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ann |= CNS11643_2_ann; \
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} \
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\
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if (used == CNS11643_2_set) \
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{ \
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if (__builtin_expect (outptr + 2 > outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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*outptr++ = SS2_0; \
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*outptr++ = SS2_1; \
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} \
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else \
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{ \
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/* We only have to emit something is currently ASCII is \
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selected. Otherwise we are switching within the \
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SO charset. */ \
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if (set == ASCII_set) \
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{ \
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if (__builtin_expect (outptr + 1 > outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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*outptr++ = SO; \
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} \
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} \
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\
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/* Always test the length here since we have used up all the \
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guaranteed output buffer slots. */ \
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if (__builtin_expect (outptr + 2 > outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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} \
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else if (NEED_LENGTH_TEST \
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&& __builtin_expect (outptr + 2 > outend, 0)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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*outptr++ = buf[0]; \
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*outptr++ = buf[1]; \
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} \
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\
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/* Now that we wrote the output increment the input pointer. */ \
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inptr += 4; \
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}
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#define EXTRA_LOOP_DECLS , int *setp
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#define INIT_PARAMS int set = *setp & CURRENT_SEL_MASK; \
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int ann = *setp & CURRENT_ANN_MASK
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#define UPDATE_PARAMS *setp = set | ann
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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