root/mbstring/libmbfl/filters/mbfilter_euc_cn.c

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DEFINITIONS

This source file includes following definitions.
  1. mbfl_filt_conv_euccn_wchar
  2. mbfl_filt_conv_wchar_euccn
  3. mbfl_filt_ident_euccn

/*
 * "streamable kanji code filter and converter"
 * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
 *
 * LICENSE NOTICES
 *
 * This file is part of "streamable kanji code filter and converter",
 * which is distributed under the terms of GNU Lesser General Public 
 * License (version 2) as published by the Free Software Foundation.
 *
 * This software 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 "streamable kanji code filter and converter";
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
 * Suite 330, Boston, MA  02111-1307  USA
 *
 * The author of this file:
 *
 */
/*
 * The source code included in this files was separated from mbfilter_cn.c
 * by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "mbfilter.h"
#include "mbfilter_euc_cn.h"

#include "unicode_table_cp936.h"

static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter);

static const unsigned char mblen_table_euccn[] = { /* 0xA1-0xFE */
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
};

static const char *mbfl_encoding_euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};

const mbfl_encoding mbfl_encoding_euc_cn = {
        mbfl_no_encoding_euc_cn,
        "EUC-CN",
        "CN-GB",
        (const char *(*)[])&mbfl_encoding_euc_cn_aliases,
        mblen_table_euccn,
        MBFL_ENCTYPE_MBCS
};

const struct mbfl_identify_vtbl vtbl_identify_euccn = {
        mbfl_no_encoding_euc_cn,
        mbfl_filt_ident_common_ctor,
        mbfl_filt_ident_common_dtor,
        mbfl_filt_ident_euccn
};

const struct mbfl_convert_vtbl vtbl_euccn_wchar = {
        mbfl_no_encoding_euc_cn,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_euccn_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_euccn = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_euc_cn,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_euccn,
        mbfl_filt_conv_common_flush
};

#define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)

/*
 * EUC-CN => wchar
 */
int
mbfl_filt_conv_euccn_wchar(int c, mbfl_convert_filter *filter)
{
        int c1, w;

        switch (filter->status) {
        case 0:
                if (c >= 0 && c < 0x80) {       /* latin */
                        CK((*filter->output_function)(c, filter->data));
                } else if (c > 0xa0 && c < 0xff) {      /* dbcs lead byte */
                        filter->status = 1;
                        filter->cache = c;
                } else {
                        w = c & MBFL_WCSGROUP_MASK;
                        w |= MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(w, filter->data));
                }
                break;

        case 1:         /* dbcs second byte */
                filter->status = 0;
                c1 = filter->cache;
                if (c1 > 0xa0 && c1 < 0xff && c > 0xa0 && c < 0xff) {
                        w = (c1 - 0x81)*192 + (c - 0x40);
                        if (w >= 0 && w < cp936_ucs_table_size) {
                                w = cp936_ucs_table[w];
                        } else {
                                w = 0;
                        }
                        if (w <= 0) {
                                w = (c1 << 8) | c;
                                w &= MBFL_WCSPLANE_MASK;
                                w |= MBFL_WCSPLANE_GB2312;
                        }
                        CK((*filter->output_function)(w, filter->data));
                } else if ((c >= 0 && c < 0x21) || c == 0x7f) {         /* CTLs */
                        CK((*filter->output_function)(c, filter->data));
                } else {
                        w = (c1 << 8) | c;
                        w &= MBFL_WCSGROUP_MASK;
                        w |= MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(w, filter->data));
                }
                break;

        default:
                filter->status = 0;
                break;
        }

        return c;
}

/*
 * wchar => EUC-CN
 */
int
mbfl_filt_conv_wchar_euccn(int c, mbfl_convert_filter *filter)
{
        int c1, c2, s;

        s = 0;
        if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
                s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
        } else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
                s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
        } else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
                s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
        } else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
                s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
        } else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
                if (c == 0xff04) {
                        s = 0xa1e7;
                } else if (c == 0xff5e) {
                        s = 0xa1ab; 
                } else if (c >= 0xff01 && c <= 0xff5d) {
                        s = c - 0xff01 + 0xa3a1;
                } else if (c >= 0xffe0 && c <= 0xffe5) {
                        s = ucs_hff_s_cp936_table[c-0xffe0];
                }
        }
        c1 = (s >> 8) & 0xff;
        c2 = s & 0xff;
        
        if (c1 < 0xa1 || c2 < 0xa1) { /* exclude CP936 extension */
                s = c;
        }

        if (s <= 0) {
                c1 = c & ~MBFL_WCSPLANE_MASK;
                if (c1 == MBFL_WCSPLANE_GB2312) {
                        s = c & MBFL_WCSPLANE_MASK;
                }
                if (c == 0) {
                        s = 0;
                } else if (s <= 0) {
                        s = -1;
                }
        }
        if (s >= 0) {
                if (s < 0x80) { /* latin */
                        CK((*filter->output_function)(s, filter->data));
                } else {
                        CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
                        CK((*filter->output_function)(s & 0xff, filter->data));
                }
        } else {
                if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
                        CK(mbfl_filt_conv_illegal_output(c, filter));
                }
        }

        return c;
}

static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter)
{
        switch (filter->status) {
        case  0:        /* latin */
                if (c >= 0 && c < 0x80) {       /* ok */
                        ;
                } else if (c > 0xa0 && c < 0xff) {      /* DBCS lead byte */
                        filter->status = 1;
                } else {                                                        /* bad */
                        filter->flag = 1;
                }
                break;

        case  1:        /* got lead byte */
                if (c < 0xa1 || c > 0xfe) {             /* bad */
                        filter->flag = 1;
                }
                filter->status = 0;
                break;

        default:
                filter->status = 0;
                break;
        }

        return c;
}



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