/* * "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: Rui Hirokawa * */ /* * The source code included in this files was separated from mbfilter_tw.c * by moriyoshi koizumi on 4 dec 2002. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "mbfilter.h" #include "mbfilter_big5.h" #include "unicode_table_big5.h" static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter); static const unsigned char mblen_table_big5[] = { /* 0x81-0xFE */ 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, 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, 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_big5_aliases[] = {"CN-BIG5", "BIG-FIVE", "BIGFIVE", "CP950", NULL}; const mbfl_encoding mbfl_encoding_big5 = { mbfl_no_encoding_big5, "BIG-5", "BIG5", (const char *(*)[])&mbfl_encoding_big5_aliases, mblen_table_big5, MBFL_ENCTYPE_MBCS }; const struct mbfl_identify_vtbl vtbl_identify_big5 = { mbfl_no_encoding_big5, mbfl_filt_ident_common_ctor, mbfl_filt_ident_common_dtor, mbfl_filt_ident_big5 }; const struct mbfl_convert_vtbl vtbl_big5_wchar = { mbfl_no_encoding_big5, mbfl_no_encoding_wchar, mbfl_filt_conv_common_ctor, mbfl_filt_conv_common_dtor, mbfl_filt_conv_big5_wchar, mbfl_filt_conv_common_flush }; const struct mbfl_convert_vtbl vtbl_wchar_big5 = { mbfl_no_encoding_wchar, mbfl_no_encoding_big5, mbfl_filt_conv_common_ctor, mbfl_filt_conv_common_dtor, mbfl_filt_conv_wchar_big5, mbfl_filt_conv_common_flush }; #define CK(statement) do { if ((statement) < 0) return (-1); } while (0) /* * Big5 => wchar */ int mbfl_filt_conv_big5_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 ((c > 0x39 && c < 0x7f) | (c > 0xa0 && c < 0xff)) { if (c < 0x7f){ w = (c1 - 0xa1)*157 + (c - 0x40); } else { w = (c1 - 0xa1)*157 + (c - 0xa1) + 0x3f; } if (w >= 0 && w < big5_ucs_table_size) { w = big5_ucs_table[w]; } else { w = 0; } if (w <= 0) { w = (c1 << 8) | c; w &= MBFL_WCSPLANE_MASK; w |= MBFL_WCSPLANE_BIG5; } 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 => Big5 */ int mbfl_filt_conv_wchar_big5(int c, mbfl_convert_filter *filter) { int c1, s; s = 0; if (c >= ucs_a1_big5_table_min && c < ucs_a1_big5_table_max) { s = ucs_a1_big5_table[c - ucs_a1_big5_table_min]; } else if (c >= ucs_a2_big5_table_min && c < ucs_a2_big5_table_max) { s = ucs_a2_big5_table[c - ucs_a2_big5_table_min]; } else if (c >= ucs_a3_big5_table_min && c < ucs_a3_big5_table_max) { s = ucs_a3_big5_table[c - ucs_a3_big5_table_min]; } else if (c >= ucs_i_big5_table_min && c < ucs_i_big5_table_max) { s = ucs_i_big5_table[c - ucs_i_big5_table_min]; } else if (c >= ucs_pua_big5_table_min && c < ucs_pua_big5_table_max) { s = ucs_pua_big5_table[c - ucs_pua_big5_table_min]; } else if (c >= ucs_r1_big5_table_min && c < ucs_r1_big5_table_max) { s = ucs_r1_big5_table[c - ucs_r1_big5_table_min]; } else if (c >= ucs_r2_big5_table_min && c < ucs_r2_big5_table_max) { s = ucs_r2_big5_table[c - ucs_r2_big5_table_min]; } if (s <= 0) { c1 = c & ~MBFL_WCSPLANE_MASK; if (c1 == MBFL_WCSPLANE_BIG5) { 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_big5(int c, mbfl_identify_filter *filter) { if (filter->status) { /* kanji second char */ if (c < 0x40 || (c > 0x7e && c < 0xa1) ||c > 0xfe) { /* bad */ filter->flag = 1; } filter->status = 0; } else if (c >= 0 && c < 0x80) { /* latin ok */ ; } else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */ filter->status = 1; } else { /* bad */ filter->flag = 1; } return c; }