root/ext/mbstring/libmbfl/filters/mbfilter_hz.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. mbfl_filt_conv_hz_wchar
  2. mbfl_filt_conv_wchar_hz
  3. mbfl_filt_conv_any_hz_flush
  4. mbfl_filt_ident_hz

/*
 * "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_hz.h"

#include "unicode_table_cp936.h"

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

const mbfl_encoding mbfl_encoding_hz = {
        mbfl_no_encoding_hz,
        "HZ",
        "HZ-GB-2312",
        NULL,
        NULL,
        MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE | MBFL_ENCTYPE_GL_UNSAFE
};

const struct mbfl_identify_vtbl vtbl_identify_hz = {
        mbfl_no_encoding_hz,
        mbfl_filt_ident_common_ctor,
        mbfl_filt_ident_common_dtor,
        mbfl_filt_ident_hz
};

const struct mbfl_convert_vtbl vtbl_hz_wchar = {
        mbfl_no_encoding_hz,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_hz_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_hz = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_hz,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_hz,
        mbfl_filt_conv_any_hz_flush
};

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

/*
 * HZ => wchar
 */
int
mbfl_filt_conv_hz_wchar(int c, mbfl_convert_filter *filter)
{
        int c1, s, w;

        switch (filter->status & 0xf) {
/*      case 0x00:       ASCII */
/*      case 0x10:       GB2312 */
        case 0:
                if (c == 0x7e) {
                        filter->status += 2;
                } else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) {    /* DBCS first char */
                        filter->cache = c;
                        filter->status += 1;
                } else if (c >= 0 && c < 0x80) {                /* latin, CTLs */
                        CK((*filter->output_function)(c, filter->data));
                } else {
                        w = c & MBFL_WCSGROUP_MASK;
                        w |= MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(w, filter->data));
                }
                break;

/*      case 0x11:       GB2312 second char */
        case 1:
                filter->status &= ~0xf;
                c1 = filter->cache;
                if (c1 > 0x20 && c1 < 0x7f && c > 0x20 && c < 0x7f) {
                        s = (c1 - 1)*192 + c + 0x40; /* GB2312 */
                        if (s >= 0 && s < cp936_ucs_table_size) {
                                w = cp936_ucs_table[s];
                        } 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;

        /* '~' */
        case 2:
                if (c == 0x7d) {                /* '}' */
                        filter->status = 0x0;
                } else if (c == 0x7b) {         /* '{' */
                        filter->status = 0x10;
                } else if (c == 0x7e) { /* '~' */
                        filter->status = 0x0;
                        CK((*filter->output_function)(0x007e, filter->data));
                }
                break;

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

        return c;
}

/*
 * wchar => HZ
 */
int
mbfl_filt_conv_wchar_hz(int c, mbfl_convert_filter *filter)
{
        int 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];
                }
        }
        if (s & 0x8000) {
                s -= 0x8080;
        }

        if (s <= 0) {
                if (c == 0) {
                        s = 0;
                } else if (s <= 0) {
                        s = -1;
                }
        } else if ((s >= 0x80 && s < 0x2121) || (s > 0x8080)) {
                s = -1;
        }
        if (s >= 0) {
                if (s < 0x80) { /* ASCII */
                        if ((filter->status & 0xff00) != 0) {
                                CK((*filter->output_function)(0x7e, filter->data));             /* '~' */
                                CK((*filter->output_function)(0x7d, filter->data));             /* '}' */
                        }
                        filter->status = 0;
                        if (s == 0x7e){
                                CK((*filter->output_function)(0x7e, filter->data));
                        }
                        CK((*filter->output_function)(s, filter->data));
                } else { /* GB 2312-80 */
                        if ((filter->status & 0xff00) != 0x200) {
                                CK((*filter->output_function)(0x7e, filter->data));             /* '~' */
                                CK((*filter->output_function)(0x7b, filter->data));             /* '{' */
                        }
                        filter->status = 0x200;
                        CK((*filter->output_function)((s >> 8) & 0x7f, filter->data));
                        CK((*filter->output_function)(s & 0x7f, filter->data));
                }
        } else {
                if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
                        CK(mbfl_filt_conv_illegal_output(c, filter));
                }
        }

        return c;
}

int
mbfl_filt_conv_any_hz_flush(mbfl_convert_filter *filter)
{
        /* back to latin */
        if ((filter->status & 0xff00) != 0) {
                CK((*filter->output_function)(0x7e, filter->data));             /* ~ */
                CK((*filter->output_function)(0x7d, filter->data));             /* '{' */
        }
        filter->status &= 0xff;
        return 0;
}

static int mbfl_filt_ident_hz(int c, mbfl_identify_filter *filter)
{
        switch (filter->status & 0xf) {
/*      case 0x00:       ASCII */
/*      case 0x10:       GB2312 */
        case 0:
                if (c == 0x7e) {
                        filter->status += 2;
                } else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) {            /* DBCS first char */
                        filter->status += 1;
                } else if (c >= 0 && c < 0x80) {                /* latin, CTLs */
                        ;
                } else {
                        filter->flag = 1;       /* bad */
                }
                break;

/*      case 0x11:       GB2312 second char */
        case 1:
                filter->status &= ~0xf;
                if (c < 0x21 || c > 0x7e) {             /* bad */
                        filter->flag = 1;
                }
                break;

        case 2:
                if (c == 0x7d) {                /* '}' */
                        filter->status = 0;
                } else if (c == 0x7b) {         /* '{' */
                        filter->status = 0x10;
                } else if (c == 0x7e) {         /* '~' */
                        filter->status = 0;
                } else {
                        filter->flag = 1;       /* bad */
                        filter->status &= ~0xf;
                }
                break;

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

        return c;
}


/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */

/* [<][>][^][v][top][bottom][index][help] */