root/ext/mbstring/libmbfl/filters/mbfilter_byte4.c

DEFINITIONS

1. mbfl_filt_conv_byte4be_wchar
2. mbfl_filt_conv_wchar_byte4be
3. mbfl_filt_conv_byte4le_wchar
4. mbfl_filt_conv_wchar_byte4le

   1 /*
   2  * "streamable kanji code filter and converter"
   3  * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
   4  *
   5  * LICENSE NOTICES
   6  *
   7  * This file is part of "streamable kanji code filter and converter",
   8  * which is distributed under the terms of GNU Lesser General Public
   9  * License (version 2) as published by the Free Software Foundation.
  10  *
  11  * This software is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with "streamable kanji code filter and converter";
  18  * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  19  * Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * The author of this file:
  22  *
  23  */
  24 /*
  25  * The source code included in this files was separated from mbfilter.c
  26  * by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002. The file
  27  * mbfilter.c is included in this package .
  28  *
  29  */
  30 
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34 
  35 #include "mbfilter.h"
  36 #include "mbfilter_byte4.h"
  37 
  38 const mbfl_encoding mbfl_encoding_byte4be = {
  39         mbfl_no_encoding_byte4be,
  40         "byte4be",
  41         NULL,
  42         NULL,
  43         NULL,
  44         MBFL_ENCTYPE_SBCS
  45 };
  46 
  47 const mbfl_encoding mbfl_encoding_byte4le = {
  48         mbfl_no_encoding_byte4le,
  49         "byte4le",
  50         NULL,
  51         NULL,
  52         NULL,
  53         MBFL_ENCTYPE_SBCS
  54 };
  55 
  56 const struct mbfl_convert_vtbl vtbl_byte4be_wchar = {
  57         mbfl_no_encoding_byte4be,
  58         mbfl_no_encoding_wchar,
  59         mbfl_filt_conv_common_ctor,
  60         mbfl_filt_conv_common_dtor,
  61         mbfl_filt_conv_byte4be_wchar,
  62         mbfl_filt_conv_common_flush
  63 };
  64 
  65 const struct mbfl_convert_vtbl vtbl_wchar_byte4be = {
  66         mbfl_no_encoding_wchar,
  67         mbfl_no_encoding_byte4be,
  68         mbfl_filt_conv_common_ctor,
  69         mbfl_filt_conv_common_dtor,
  70         mbfl_filt_conv_wchar_byte4be,
  71         mbfl_filt_conv_common_flush };
  72 
  73 const struct mbfl_convert_vtbl vtbl_byte4le_wchar = {
  74         mbfl_no_encoding_byte4le,
  75         mbfl_no_encoding_wchar,
  76         mbfl_filt_conv_common_ctor,
  77         mbfl_filt_conv_common_dtor,
  78         mbfl_filt_conv_byte4le_wchar,
  79         mbfl_filt_conv_common_flush
  80 };
  81 
  82 const struct mbfl_convert_vtbl vtbl_wchar_byte4le = {
  83         mbfl_no_encoding_wchar,
  84         mbfl_no_encoding_byte4le,
  85         mbfl_filt_conv_common_ctor,
  86         mbfl_filt_conv_common_dtor,
  87         mbfl_filt_conv_wchar_byte4le,
  88         mbfl_filt_conv_common_flush
  89 };
  90 
  91 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  92 
  93 int mbfl_filt_conv_byte4be_wchar(int c, mbfl_convert_filter *filter)
  94 {
  95         int n;
  96 
  97         if (filter->status == 0) {
  98                 filter->status = 1;
  99                 n = (c & 0xff) << 24;
 100                 filter->cache = n;
 101         } else if (filter->status == 1) {
 102                 filter->status = 2;
 103                 n = (c & 0xff) << 16;
 104                 filter->cache |= n;
 105         } else if (filter->status == 2) {
 106                 filter->status = 3;
 107                 n = (c & 0xff) << 8;
 108                 filter->cache |= n;
 109         } else {
 110                 filter->status = 0;
 111                 n = (c & 0xff) | filter->cache;
 112                 CK((*filter->output_function)(n, filter->data));
 113         }
 114         return c;
 115 }
 116 
 117 int mbfl_filt_conv_wchar_byte4be(int c, mbfl_convert_filter *filter)
 118 {
 119         CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
 120         CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
 121         CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
 122         CK((*filter->output_function)(c & 0xff, filter->data));
 123         return c;
 124 }
 125 
 126 int mbfl_filt_conv_byte4le_wchar(int c, mbfl_convert_filter *filter)
 127 {
 128         int n;
 129 
 130         if (filter->status == 0) {
 131                 filter->status = 1;
 132                 n = (c & 0xff);
 133                 filter->cache = n;
 134         } else if (filter->status == 1) {
 135                 filter->status = 2;
 136                 n = (c & 0xff) << 8;
 137                 filter->cache |= n;
 138         } else if (filter->status == 2) {
 139                 filter->status = 3;
 140                 n = (c & 0xff) << 16;
 141                 filter->cache |= n;
 142         } else {
 143                 filter->status = 0;
 144                 n = ((c & 0xff) << 24) | filter->cache;
 145                 CK((*filter->output_function)(n, filter->data));
 146         }
 147         return c;
 148 }
 149 
 150 int mbfl_filt_conv_wchar_byte4le(int c, mbfl_convert_filter *filter)
 151 {
 152         CK((*filter->output_function)(c & 0xff, filter->data));
 153         CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
 154         CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
 155         CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
 156         return c;
 157 }
 158 
 159