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DEFINITIONS
This source file includes following definitions.
- mbfl_filt_conv_utf7_wchar
- mbfl_filt_conv_wchar_utf7
- mbfl_filt_conv_wchar_utf7_flush
- mbfl_filt_ident_utf7
/*
* "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 4 dec 2002.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mbfilter.h"
#include "mbfilter_utf7.h"
static int mbfl_filt_ident_utf7(int c, mbfl_identify_filter *filter);
static const unsigned char mbfl_base64_table[] = {
/* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
/* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
/* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
/* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
/* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0' */
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2f,0x00
};
static const char *mbfl_encoding_utf7_aliases[] = {"utf7", NULL};
const mbfl_encoding mbfl_encoding_utf7 = {
mbfl_no_encoding_utf7,
"UTF-7",
"UTF-7",
(const char *(*)[])&mbfl_encoding_utf7_aliases,
NULL,
MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE | MBFL_ENCTYPE_GL_UNSAFE
};
const struct mbfl_identify_vtbl vtbl_identify_utf7 = {
mbfl_no_encoding_utf7,
mbfl_filt_ident_common_ctor,
mbfl_filt_ident_common_dtor,
mbfl_filt_ident_utf7
};
const struct mbfl_convert_vtbl vtbl_utf7_wchar = {
mbfl_no_encoding_utf7,
mbfl_no_encoding_wchar,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_utf7_wchar,
mbfl_filt_conv_common_flush
};
const struct mbfl_convert_vtbl vtbl_wchar_utf7 = {
mbfl_no_encoding_wchar,
mbfl_no_encoding_utf7,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_wchar_utf7,
mbfl_filt_conv_wchar_utf7_flush
};
#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
/*
* UTF-7 => wchar
*/
int mbfl_filt_conv_utf7_wchar(int c, mbfl_convert_filter *filter)
{
int s, n;
n = -1;
if (filter->status != 0) { /* Modified Base64 */
if (c >= 0x41 && c <= 0x5a) { /* A - Z */
n = c - 65;
} else if (c >= 0x61 && c <= 0x7a) { /* a - z */
n = c - 71;
} else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
n = c + 4;
} else if (c == 0x2b) { /* '+' */
n = 62;
} else if (c == 0x2f) { /* '/' */
n = 63;
}
if (n < 0 || n > 63) {
if (c == 0x2d) {
if (filter->status == 1) { /* "+-" -> "+" */
CK((*filter->output_function)(0x2b, filter->data));
}
} else if (c >= 0 && c < 0x80) { /* ASCII exclude '-' */
CK((*filter->output_function)(c, filter->data));
} else { /* illegal character */
s = c & MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(s, filter->data));
}
filter->cache = 0;
filter->status = 0;
return c;
}
}
switch (filter->status) {
/* directly encoded characters */
case 0:
if (c == 0x2b) { /* '+' shift character */
filter->status = 1;
} else if (c >= 0 && c < 0x80) { /* ASCII */
CK((*filter->output_function)(c, filter->data));
} else { /* illegal character */
s = c & MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(s, filter->data));
}
break;
/* decode Modified Base64 */
case 1:
case 2:
filter->cache |= n << 10;
filter->status = 3;
break;
case 3:
filter->cache |= n << 4;
filter->status = 4;
break;
case 4:
s = ((n >> 2) & 0xf) | (filter->cache & 0xffff);
n = (n & 0x3) << 14;
filter->status = 5;
if (s >= 0xd800 && s < 0xdc00) {
s = (((s & 0x3ff) << 16) + 0x400000) | n;
filter->cache = s;
} else if (s >= 0xdc00 && s < 0xe000) {
s &= 0x3ff;
s |= (filter->cache & 0xfff0000) >> 6;
filter->cache = n;
if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
CK((*filter->output_function)(s, filter->data));
} else { /* illegal character */
s &= MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(s, filter->data));
}
} else {
filter->cache = n;
CK((*filter->output_function)(s, filter->data));
}
break;
case 5:
filter->cache |= n << 8;
filter->status = 6;
break;
case 6:
filter->cache |= n << 2;
filter->status = 7;
break;
case 7:
s = ((n >> 4) & 0x3) | (filter->cache & 0xffff);
n = (n & 0xf) << 12;
filter->status = 8;
if (s >= 0xd800 && s < 0xdc00) {
s = (((s & 0x3ff) << 16) + 0x400000) | n;
filter->cache = s;
} else if (s >= 0xdc00 && s < 0xe000) {
s &= 0x3ff;
s |= (filter->cache & 0xfff0000) >> 6;
filter->cache = n;
if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
CK((*filter->output_function)(s, filter->data));
} else { /* illegal character */
s &= MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(s, filter->data));
}
} else {
filter->cache = n;
CK((*filter->output_function)(s, filter->data));
}
break;
case 8:
filter->cache |= n << 6;
filter->status = 9;
break;
case 9:
s = n | (filter->cache & 0xffff);
filter->status = 2;
if (s >= 0xd800 && s < 0xdc00) {
s = (((s & 0x3ff) << 16) + 0x400000);
filter->cache = s;
} else if (s >= 0xdc00 && s < 0xe000) {
s &= 0x3ff;
s |= (filter->cache & 0xfff0000) >> 6;
filter->cache = 0;
if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
CK((*filter->output_function)(s, filter->data));
} else { /* illegal character */
s &= MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(s, filter->data));
}
} else {
filter->cache = 0;
CK((*filter->output_function)(s, filter->data));
}
break;
default:
filter->status = 0;
break;
}
return c;
}
/*
* wchar => UTF-7
*/
int mbfl_filt_conv_wchar_utf7(int c, mbfl_convert_filter *filter)
{
int s, n;
n = 0;
if (c >= 0 && c < 0x80) { /* ASCII */
if (c >= 0x41 && c <= 0x5a) { /* A - Z */
n = 1;
} else if (c >= 0x61 && c <= 0x7a) { /* a - z */
n = 1;
} else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
n = 1;
} else if (c == '\0') { /* '\0' */
n = 1;
} else if (c == 0x2f) { /* '/' */
n = 1;
} else if (c == 0x2d) { /* '-' */
n = 1;
} else if (c == 0x20) { /* SPACE */
n = 2;
} else if (c == 0x09) { /* HTAB */
n = 2;
} else if (c == 0x0d) { /* CR */
n = 2;
} else if (c == 0x0a) { /* LF */
n = 2;
} else if (c == 0x27) { /* "'" */
n = 2;
} else if (c == 0x28) { /* '(' */
n = 2;
} else if (c == 0x29) { /* ')' */
n = 2;
} else if (c == 0x2c) { /* ',' */
n = 2;
} else if (c == 0x2e) { /* '.' */
n = 2;
} else if (c == 0x3a) { /* ':' */
n = 2;
} else if (c == 0x3f) { /* '?' */
n = 2;
}
} else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
;
} else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
s = ((c >> 10) - 0x40) | 0xd800;
CK((*filter->filter_function)(s, filter));
s = (c & 0x3ff) | 0xdc00;
CK((*filter->filter_function)(s, filter));
return c;
} else {
if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
CK(mbfl_filt_conv_illegal_output(c, filter));
}
return c;
}
switch (filter->status) {
case 0:
if (n != 0) { /* directly encode characters */
CK((*filter->output_function)(c, filter->data));
} else { /* Modified Base64 */
CK((*filter->output_function)(0x2b, filter->data)); /* '+' */
filter->status++;
filter->cache = c;
}
break;
/* encode Modified Base64 */
case 1:
s = filter->cache;
CK((*filter->output_function)(mbfl_base64_table[(s >> 10) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(s >> 4) & 0x3f], filter->data));
if (n != 0) {
CK((*filter->output_function)(mbfl_base64_table[(s << 2) & 0x3c], filter->data));
if (n == 1) {
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
}
CK((*filter->output_function)(c, filter->data));
filter->status = 0;
} else {
filter->status++;
filter->cache = ((s & 0xf) << 16) | c;
}
break;
case 2:
s = filter->cache;
CK((*filter->output_function)(mbfl_base64_table[(s >> 14) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(s >> 8) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(s >> 2) & 0x3f], filter->data));
if (n != 0) {
CK((*filter->output_function)(mbfl_base64_table[(s << 4) & 0x30], filter->data));
if (n == 1) {
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
}
CK((*filter->output_function)(c, filter->data));
filter->status = 0;
} else {
filter->status++;
filter->cache = ((s & 0x3) << 16) | c;
}
break;
case 3:
s = filter->cache;
CK((*filter->output_function)(mbfl_base64_table[(s >> 12) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(s >> 6) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[s & 0x3f], filter->data));
if (n != 0) {
if (n == 1) {
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
}
CK((*filter->output_function)(c, filter->data));
filter->status = 0;
} else {
filter->status = 1;
filter->cache = c;
}
break;
default:
filter->status = 0;
break;
}
return c;
}
int mbfl_filt_conv_wchar_utf7_flush(mbfl_convert_filter *filter)
{
int status, cache;
status = filter->status;
cache = filter->cache;
filter->status = 0;
filter->cache = 0;
/* flush fragments */
switch (status) {
case 1:
CK((*filter->output_function)(mbfl_base64_table[(cache >> 10) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache >> 4) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache << 2) & 0x3c], filter->data));
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
break;
case 2:
CK((*filter->output_function)(mbfl_base64_table[(cache >> 14) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache >> 8) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache >> 2) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache << 4) & 0x30], filter->data));
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
break;
case 3:
CK((*filter->output_function)(mbfl_base64_table[(cache >> 12) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache >> 6) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[cache & 0x3f], filter->data));
CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
break;
}
if (filter->flush_function != NULL) {
(*filter->flush_function)(filter->data);
}
return 0;
}
static int mbfl_filt_ident_utf7(int c, mbfl_identify_filter *filter)
{
int n;
switch (filter->status) {
/* directly encoded characters */
case 0:
if (c == 0x2b) { /* '+' shift character */
filter->status++;
} else if (c == 0x5c || c == 0x7e || c < 0 || c > 0x7f) { /* illegal character */
filter->flag = 1; /* bad */
}
break;
/* Modified Base64 */
case 1:
case 2:
n = 0;
if (c >= 0x41 && c <= 0x5a) { /* A - Z */
n = 1;
} else if (c >= 0x61 && c <= 0x7a) { /* a - z */
n = 1;
} else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
n = 1;
} else if (c == 0x2b) { /* '+' */
n = 1;
} else if (c == 0x2f) { /* '/' */
n = 1;
}
if (n <= 0) {
if (filter->status == 1 && c != 0x2d) {
filter->flag = 1; /* bad */
} else if (c < 0 || c > 0x7f) {
filter->flag = 1; /* bad */
}
filter->status = 0;
} else {
filter->status = 2;
}
break;
default:
filter->status = 0;
break;
}
return c;
}