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_base64.h"
37
38 const mbfl_encoding mbfl_encoding_base64 = {
39 mbfl_no_encoding_base64,
40 "BASE64",
41 "BASE64",
42 NULL,
43 NULL,
44 MBFL_ENCTYPE_ENC_STRM | MBFL_ENCTYPE_GL_UNSAFE
45 };
46
47 const struct mbfl_convert_vtbl vtbl_8bit_b64 = {
48 mbfl_no_encoding_8bit,
49 mbfl_no_encoding_base64,
50 mbfl_filt_conv_common_ctor,
51 mbfl_filt_conv_common_dtor,
52 mbfl_filt_conv_base64enc,
53 mbfl_filt_conv_base64enc_flush
54 };
55
56 const struct mbfl_convert_vtbl vtbl_b64_8bit = {
57 mbfl_no_encoding_base64,
58 mbfl_no_encoding_8bit,
59 mbfl_filt_conv_common_ctor,
60 mbfl_filt_conv_common_dtor,
61 mbfl_filt_conv_base64dec,
62 mbfl_filt_conv_base64dec_flush
63 };
64
65
66 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
67
68 /*
69 * any => BASE64
70 */
71 static const unsigned char mbfl_base64_table[] = {
72 /* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
73 0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
74 /* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
75 0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
76 /* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
77 0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
78 /* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
79 0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
80 /* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0' */
81 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2f,0x00
82 };
83
mbfl_filt_conv_base64enc(int c,mbfl_convert_filter * filter)84 int mbfl_filt_conv_base64enc(int c, mbfl_convert_filter *filter)
85 {
86 int n;
87
88 n = (filter->status & 0xff);
89 if (n == 0) {
90 filter->status++;
91 filter->cache = (c & 0xff) << 16;
92 } else if (n == 1) {
93 filter->status++;
94 filter->cache |= (c & 0xff) << 8;
95 } else {
96 filter->status &= ~0xff;
97 if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
98 n = (filter->status & 0xff00) >> 8;
99 if (n > 72) {
100 CK((*filter->output_function)(0x0d, filter->data)); /* CR */
101 CK((*filter->output_function)(0x0a, filter->data)); /* LF */
102 filter->status &= ~0xff00;
103 }
104 filter->status += 0x400;
105 }
106 n = filter->cache | (c & 0xff);
107 CK((*filter->output_function)(mbfl_base64_table[(n >> 18) & 0x3f], filter->data));
108 CK((*filter->output_function)(mbfl_base64_table[(n >> 12) & 0x3f], filter->data));
109 CK((*filter->output_function)(mbfl_base64_table[(n >> 6) & 0x3f], filter->data));
110 CK((*filter->output_function)(mbfl_base64_table[n & 0x3f], filter->data));
111 }
112
113 return c;
114 }
115
mbfl_filt_conv_base64enc_flush(mbfl_convert_filter * filter)116 int mbfl_filt_conv_base64enc_flush(mbfl_convert_filter *filter)
117 {
118 int status, cache, len;
119
120 status = filter->status & 0xff;
121 cache = filter->cache;
122 len = (filter->status & 0xff00) >> 8;
123 filter->status &= ~0xffff;
124 filter->cache = 0;
125 /* flush fragments */
126 if (status >= 1) {
127 if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
128 if (len > 72){
129 CK((*filter->output_function)(0x0d, filter->data)); /* CR */
130 CK((*filter->output_function)(0x0a, filter->data)); /* LF */
131 }
132 }
133 CK((*filter->output_function)(mbfl_base64_table[(cache >> 18) & 0x3f], filter->data));
134 CK((*filter->output_function)(mbfl_base64_table[(cache >> 12) & 0x3f], filter->data));
135 if (status == 1) {
136 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
137 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
138 } else {
139 CK((*filter->output_function)(mbfl_base64_table[(cache >> 6) & 0x3f], filter->data));
140 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
141 }
142 }
143 return 0;
144 }
145
146 /*
147 * BASE64 => any
148 */
mbfl_filt_conv_base64dec(int c,mbfl_convert_filter * filter)149 int mbfl_filt_conv_base64dec(int c, mbfl_convert_filter *filter)
150 {
151 int n;
152
153 if (c == 0x0d || c == 0x0a || c == 0x20 || c == 0x09 || c == 0x3d) { /* CR or LF or SPACE or HTAB or '=' */
154 return c;
155 }
156
157 n = 0;
158 if (c >= 0x41 && c <= 0x5a) { /* A - Z */
159 n = c - 65;
160 } else if (c >= 0x61 && c <= 0x7a) { /* a - z */
161 n = c - 71;
162 } else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
163 n = c + 4;
164 } else if (c == 0x2b) { /* '+' */
165 n = 62;
166 } else if (c == 0x2f) { /* '/' */
167 n = 63;
168 }
169 n &= 0x3f;
170
171 switch (filter->status) {
172 case 0:
173 filter->status = 1;
174 filter->cache = n << 18;
175 break;
176 case 1:
177 filter->status = 2;
178 filter->cache |= n << 12;
179 break;
180 case 2:
181 filter->status = 3;
182 filter->cache |= n << 6;
183 break;
184 default:
185 filter->status = 0;
186 n |= filter->cache;
187 CK((*filter->output_function)((n >> 16) & 0xff, filter->data));
188 CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
189 CK((*filter->output_function)(n & 0xff, filter->data));
190 break;
191 }
192
193 return c;
194 }
195
mbfl_filt_conv_base64dec_flush(mbfl_convert_filter * filter)196 int mbfl_filt_conv_base64dec_flush(mbfl_convert_filter *filter)
197 {
198 int status, cache;
199
200 status = filter->status;
201 cache = filter->cache;
202 filter->status = 0;
203 filter->cache = 0;
204 /* flush fragments */
205 if (status >= 2) {
206 CK((*filter->output_function)((cache >> 16) & 0xff, filter->data));
207 if (status >= 3) {
208 CK((*filter->output_function)((cache >> 8) & 0xff, filter->data));
209 }
210 }
211 return 0;
212 }
213
