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373 lines
11 KiB
C
373 lines
11 KiB
C
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/*
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* "streamable kanji code filter and converter"
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* Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
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*
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* LICENSE NOTICES
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*
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* This file is part of "streamable kanji code filter and converter",
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* which is distributed under the terms of GNU Lesser General Public
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* License (version 2) as published by the Free Software Foundation.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with "streamable kanji code filter and converter";
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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* Suite 330, Boston, MA 02111-1307 USA
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*
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* The author of this file:
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*
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*/
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/*
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* The source code included in this files was separated from mbfilter.c
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* by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "mbfilter.h"
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#include "mbfilter_utf7imap.h"
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const mbfl_encoding mbfl_encoding_utf7imap = {
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mbfl_no_encoding_utf7imap,
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"UTF7-IMAP",
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NULL,
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NULL,
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NULL,
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MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
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};
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const struct mbfl_convert_vtbl vtbl_utf7imap_wchar = {
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mbfl_no_encoding_utf7imap,
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mbfl_no_encoding_wchar,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_utf7imap_wchar,
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mbfl_filt_conv_common_flush };
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const struct mbfl_convert_vtbl vtbl_wchar_utf7imap = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_utf7imap,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_wchar_utf7imap,
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mbfl_filt_conv_wchar_utf7imap_flush };
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#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
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/*
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* UTF7-IMAP => wchar
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*/
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int mbfl_filt_conv_utf7imap_wchar(int c, mbfl_convert_filter *filter)
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{
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int s, n;
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n = -1;
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if (filter->status != 0) { /* Modified Base64 */
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if (c >= 0x41 && c <= 0x5a) { /* A - Z */
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n = c - 65;
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} else if (c >= 0x61 && c <= 0x7a) { /* a - z */
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n = c - 71;
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} else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
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n = c + 4;
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} else if (c == 0x2b) { /* '+' */
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n = 62;
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} else if (c == 0x2c) { /* ',' */
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n = 63;
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}
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if (n < 0 || n > 63) {
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if (c == 0x2d) {
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if (filter->status == 1) { /* "&-" -> "&" */
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CK((*filter->output_function)(0x26, filter->data));
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}
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} else if (c >= 0 && c < 0x80) { /* ASCII exclude '-' */
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CK((*filter->output_function)(c, filter->data));
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} else { /* illegal character */
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s = c & MBFL_WCSGROUP_MASK;
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s |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(s, filter->data));
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}
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filter->cache = 0;
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filter->status = 0;
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return c;
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}
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}
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switch (filter->status) {
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/* directly encoded characters */
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case 0:
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if (c == 0x26) { /* '&' shift character */
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filter->status++;
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} else if (c >= 0 && c < 0x80) { /* ASCII */
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CK((*filter->output_function)(c, filter->data));
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} else { /* illegal character */
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s = c & MBFL_WCSGROUP_MASK;
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s |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(s, filter->data));
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}
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break;
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/* decode Modified Base64 */
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case 1:
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case 2:
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filter->cache |= n << 10;
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filter->status = 3;
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break;
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case 3:
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filter->cache |= n << 4;
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filter->status = 4;
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break;
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case 4:
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s = ((n >> 2) & 0xf) | (filter->cache & 0xffff);
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n = (n & 0x3) << 14;
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filter->status = 5;
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if (s >= 0xd800 && s < 0xdc00) {
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s = (((s & 0x3ff) << 16) + 0x400000) | n;
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filter->cache = s;
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} else if (s >= 0xdc00 && s < 0xe000) {
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s &= 0x3ff;
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s |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = n;
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if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(s, filter->data));
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} else { /* illegal character */
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s &= MBFL_WCSGROUP_MASK;
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s |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(s, filter->data));
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}
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} else {
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filter->cache = n;
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CK((*filter->output_function)(s, filter->data));
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}
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break;
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case 5:
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filter->cache |= n << 8;
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filter->status = 6;
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break;
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case 6:
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filter->cache |= n << 2;
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filter->status = 7;
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break;
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case 7:
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s = ((n >> 4) & 0x3) | (filter->cache & 0xffff);
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n = (n & 0xf) << 12;
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filter->status = 8;
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if (s >= 0xd800 && s < 0xdc00) {
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s = (((s & 0x3ff) << 16) + 0x400000) | n;
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filter->cache = s;
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} else if (s >= 0xdc00 && s < 0xe000) {
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s &= 0x3ff;
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s |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = n;
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if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(s, filter->data));
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} else { /* illegal character */
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s &= MBFL_WCSGROUP_MASK;
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s |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(s, filter->data));
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}
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} else {
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filter->cache = n;
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CK((*filter->output_function)(s, filter->data));
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}
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break;
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case 8:
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filter->cache |= n << 6;
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filter->status = 9;
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break;
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case 9:
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s = n | (filter->cache & 0xffff);
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filter->status = 2;
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if (s >= 0xd800 && s < 0xdc00) {
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s = (((s & 0x3ff) << 16) + 0x400000);
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filter->cache = s;
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} else if (s >= 0xdc00 && s < 0xe000) {
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s &= 0x3ff;
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s |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = 0;
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if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(s, filter->data));
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} else { /* illegal character */
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s &= MBFL_WCSGROUP_MASK;
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s |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(s, filter->data));
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}
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} else {
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filter->cache = 0;
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CK((*filter->output_function)(s, filter->data));
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}
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break;
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default:
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filter->status = 0;
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break;
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}
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return c;
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}
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static const unsigned char mbfl_utf7imap_base64_table[] =
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{
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/* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
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0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
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/* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
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0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
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/* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
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0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
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/* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
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0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
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/* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', ',', '\0' */
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0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2c,0x00
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};
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/*
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* wchar => UTF7-IMAP
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*/
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int mbfl_filt_conv_wchar_utf7imap(int c, mbfl_convert_filter *filter)
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{
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int n, s;
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n = 0;
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if (c == 0x26) {
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n = 1;
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} else if ((c >= 0x20 && c <= 0x7e) || c == 0) {
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n = 2;
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} else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
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;
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} else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
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s = ((c >> 10) - 0x40) | 0xd800;
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CK((*filter->filter_function)(s, filter));
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s = (c & 0x3ff) | 0xdc00;
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CK((*filter->filter_function)(s, filter));
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return c;
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} else {
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if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
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CK(mbfl_filt_conv_illegal_output(c, filter));
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}
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return c;
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}
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switch (filter->status) {
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case 0:
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if (n != 0) { /* directly encode characters */
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CK((*filter->output_function)(c, filter->data));
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if (n == 1) {
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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}
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} else { /* Modified Base64 */
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CK((*filter->output_function)(0x26, filter->data)); /* '&' */
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filter->status = 1;
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filter->cache = c;
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}
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break;
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/* encode Modified Base64 */
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case 1:
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s = filter->cache;
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 10) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 4) & 0x3f], filter->data));
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if (n != 0) {
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 2) & 0x3c], filter->data));
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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CK((*filter->output_function)(c, filter->data));
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if (n == 1) {
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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}
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filter->status = 0;
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} else {
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filter->status = 2;
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filter->cache = ((s & 0xf) << 16) | c;
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}
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break;
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case 2:
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s = filter->cache;
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 14) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 8) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 2) & 0x3f], filter->data));
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if (n != 0) {
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 4) & 0x30], filter->data));
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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CK((*filter->output_function)(c, filter->data));
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if (n == 1) {
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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}
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filter->status = 0;
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} else {
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filter->status = 3;
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filter->cache = ((s & 0x3) << 16) | c;
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}
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break;
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case 3:
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s = filter->cache;
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 12) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 6) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[s & 0x3f], filter->data));
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if (n != 0) {
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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CK((*filter->output_function)(c, filter->data));
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if (n == 1) {
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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}
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filter->status = 0;
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} else {
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filter->status = 1;
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filter->cache = c;
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}
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break;
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default:
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filter->status = 0;
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break;
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}
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return c;
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}
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int mbfl_filt_conv_wchar_utf7imap_flush(mbfl_convert_filter *filter)
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{
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int status, cache;
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status = filter->status;
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cache = filter->cache;
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filter->status = 0;
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filter->cache = 0;
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/* flush fragments */
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switch (status) {
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case 1:
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 10) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 4) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 2) & 0x3c], filter->data));
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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break;
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case 2:
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 14) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 8) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 2) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 4) & 0x30], filter->data));
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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break;
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case 3:
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 12) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 6) & 0x3f], filter->data));
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CK((*filter->output_function)(mbfl_utf7imap_base64_table[cache & 0x3f], filter->data));
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CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
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break;
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}
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return 0;
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}
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