root/mbstring/libmbfl/filters/mbfilter_utf32.c

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DEFINITIONS

This source file includes following definitions.
  1. mbfl_filt_conv_utf32_wchar
  2. mbfl_filt_conv_utf32be_wchar
  3. mbfl_filt_conv_wchar_utf32be
  4. mbfl_filt_conv_utf32le_wchar
  5. mbfl_filt_conv_wchar_utf32le

/*
 * "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.c
 * by moriyoshi koizumi <moriyoshi@php.net> on 20 dec 2002.
 * 
 */

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

#include "mbfilter.h"
#include "mbfilter_utf32.h"

static const char *mbfl_encoding_utf32_aliases[] = {"utf32", NULL};

const mbfl_encoding mbfl_encoding_utf32 = {
        mbfl_no_encoding_utf32,
        "UTF-32",
        "UTF-32",
        (const char *(*)[])&mbfl_encoding_utf32_aliases,
        NULL,
        MBFL_ENCTYPE_WCS4BE
};

const mbfl_encoding mbfl_encoding_utf32be = {
        mbfl_no_encoding_utf32be,
        "UTF-32BE",
        "UTF-32BE",
        NULL,
        NULL,
        MBFL_ENCTYPE_WCS4BE
};

const mbfl_encoding mbfl_encoding_utf32le = {
        mbfl_no_encoding_utf32le,
        "UTF-32LE",
        "UTF-32LE",
        NULL,
        NULL,
        MBFL_ENCTYPE_WCS4LE
};

const struct mbfl_convert_vtbl vtbl_utf32_wchar = {
        mbfl_no_encoding_utf32,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_utf32_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_utf32 = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_utf32,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_utf32be,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_utf32be_wchar = {
        mbfl_no_encoding_utf32be,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_utf32be_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_utf32be = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_utf32be,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_utf32be,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_utf32le_wchar = {
        mbfl_no_encoding_utf32le,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_utf32le_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_utf32le = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_utf32le,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_utf32le,
        mbfl_filt_conv_common_flush
};

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

/*
 * UTF-32 => wchar
 */
int mbfl_filt_conv_utf32_wchar(int c, mbfl_convert_filter *filter)
{
        int n, endian;

        endian = filter->status & 0xff00;
        switch (filter->status & 0xff) {
        case 0:
                if (endian) {
                        n = c & 0xff;
                } else {
                        n = (c & 0xff) << 24;
                }
                filter->cache = n;
                filter->status++;
                break;
        case 1:
                if (endian) {
                        n = (c & 0xff) << 8;
                } else {
                        n = (c & 0xff) << 16;
                }
                filter->cache |= n;
                filter->status++;
                break;
        case 2:
                if (endian) {
                        n = (c & 0xff) << 16;
                } else {
                        n = (c & 0xff) << 8;
                }
                filter->cache |= n;
                filter->status++;
                break;
        default:
                if (endian) {
                        n = (c & 0xff) << 24;
                } else {
                        n = c & 0xff;
                }
                n |= filter->cache;
                if ((n & 0xffff) == 0 && ((n >> 16) & 0xffff) == 0xfffe) {
                        if (endian) {
                                filter->status = 0;             /* big-endian */
                        } else {
                                filter->status = 0x100;         /* little-endian */
                        }
                        CK((*filter->output_function)(0xfeff, filter->data));
                } else {
                        filter->status &= ~0xff;
                        if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
                                CK((*filter->output_function)(n, filter->data));
                        } else {
                                n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
                                CK((*filter->output_function)(n, filter->data));
                        }
                }
                break;
        }

        return c;
}

/*
 * UTF-32BE => wchar
 */
int mbfl_filt_conv_utf32be_wchar(int c, mbfl_convert_filter *filter)
{
        int n;

        if (filter->status == 0) {
                filter->status = 1;
                n = (c & 0xff) << 24;
                filter->cache = n;
        } else if (filter->status == 1) {
                filter->status = 2;
                n = (c & 0xff) << 16;
                filter->cache |= n;
        } else if (filter->status == 2) {
                filter->status = 3;
                n = (c & 0xff) << 8;
                filter->cache |= n;
        } else {
                filter->status = 0;
                n = (c & 0xff) | filter->cache;
                if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
                        CK((*filter->output_function)(n, filter->data));
                } else {
                        n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(n, filter->data));
                }
        }
        return c;
}

/*
 * wchar => UTF-32BE
 */
int mbfl_filt_conv_wchar_utf32be(int c, mbfl_convert_filter *filter)
{
        if (c >= 0 && c < MBFL_WCSPLANE_UTF32MAX) {
                CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
                CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
                CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
                CK((*filter->output_function)(c & 0xff, filter->data));
        } else {
                if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
                        CK(mbfl_filt_conv_illegal_output(c, filter));
                }
        }

        return c;
}

/*
 * UTF-32LE => wchar
 */
int mbfl_filt_conv_utf32le_wchar(int c, mbfl_convert_filter *filter)
{
        int n;

        if (filter->status == 0) {
                filter->status = 1;
                n = (c & 0xff);
                filter->cache = n;
        } else if (filter->status == 1) {
                filter->status = 2;
                n = (c & 0xff) << 8;
                filter->cache |= n;
        } else if (filter->status == 2) {
                filter->status = 3;
                n = (c & 0xff) << 16;
                filter->cache |= n;
        } else {
                filter->status = 0;
                n = ((c & 0xff) << 24) | filter->cache;
                if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
                        CK((*filter->output_function)(n, filter->data));
                } else {
                        n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(n, filter->data));
                }               
        }
        return c;
}

/*
 * wchar => UTF-32LE
 */
int mbfl_filt_conv_wchar_utf32le(int c, mbfl_convert_filter *filter)
{
        if (c >= 0 && c < MBFL_WCSPLANE_UTF32MAX) {
                CK((*filter->output_function)(c & 0xff, filter->data));
                CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
                CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
                CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
        } else {
                if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
                        CK(mbfl_filt_conv_illegal_output(c, filter));
                }
        }

        return c;
}

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