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 #include "mbfilter.h"
32 #include "mbfilter_base64.h"
33
34 const mbfl_encoding mbfl_encoding_base64 = {
35 mbfl_no_encoding_base64,
36 "BASE64",
37 "BASE64",
38 NULL,
39 NULL,
40 MBFL_ENCTYPE_GL_UNSAFE,
41 NULL,
42 NULL,
43 NULL
44 };
45
46 const struct mbfl_convert_vtbl vtbl_8bit_b64 = {
47 mbfl_no_encoding_8bit,
48 mbfl_no_encoding_base64,
49 mbfl_filt_conv_common_ctor,
50 NULL,
51 mbfl_filt_conv_base64enc,
52 mbfl_filt_conv_base64enc_flush,
53 NULL,
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 NULL,
61 mbfl_filt_conv_base64dec,
62 mbfl_filt_conv_base64dec_flush,
63 NULL,
64 };
65
66
67 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
68
69 /*
70 * any => BASE64
71 */
72 static const unsigned char mbfl_base64_table[] = {
73 /* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
74 0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
75 /* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
76 0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
77 /* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
78 0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
79 /* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
80 0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
81 /* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0' */
82 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2f,0x00
83 };
84
mbfl_filt_conv_base64enc(int c,mbfl_convert_filter * filter)85 int mbfl_filt_conv_base64enc(int c, mbfl_convert_filter *filter)
86 {
87 int n;
88
89 n = (filter->status & 0xff);
90 if (n == 0) {
91 filter->status++;
92 filter->cache = (c & 0xff) << 16;
93 } else if (n == 1) {
94 filter->status++;
95 filter->cache |= (c & 0xff) << 8;
96 } else {
97 filter->status &= ~0xff;
98 if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
99 n = (filter->status & 0xff00) >> 8;
100 if (n > 72) {
101 CK((*filter->output_function)(0x0d, filter->data)); /* CR */
102 CK((*filter->output_function)(0x0a, filter->data)); /* LF */
103 filter->status &= ~0xff00;
104 }
105 filter->status += 0x400;
106 }
107 n = filter->cache | (c & 0xff);
108 CK((*filter->output_function)(mbfl_base64_table[(n >> 18) & 0x3f], filter->data));
109 CK((*filter->output_function)(mbfl_base64_table[(n >> 12) & 0x3f], filter->data));
110 CK((*filter->output_function)(mbfl_base64_table[(n >> 6) & 0x3f], filter->data));
111 CK((*filter->output_function)(mbfl_base64_table[n & 0x3f], filter->data));
112 }
113
114 return 0;
115 }
116
mbfl_filt_conv_base64enc_flush(mbfl_convert_filter * filter)117 int mbfl_filt_conv_base64enc_flush(mbfl_convert_filter *filter)
118 {
119 int status, cache, len;
120
121 status = filter->status & 0xff;
122 cache = filter->cache;
123 len = (filter->status & 0xff00) >> 8;
124 filter->status &= ~0xffff;
125 filter->cache = 0;
126 /* flush fragments */
127 if (status >= 1) {
128 if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
129 if (len > 72){
130 CK((*filter->output_function)(0x0d, filter->data)); /* CR */
131 CK((*filter->output_function)(0x0a, filter->data)); /* LF */
132 }
133 }
134 CK((*filter->output_function)(mbfl_base64_table[(cache >> 18) & 0x3f], filter->data));
135 CK((*filter->output_function)(mbfl_base64_table[(cache >> 12) & 0x3f], filter->data));
136 if (status == 1) {
137 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
138 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
139 } else {
140 CK((*filter->output_function)(mbfl_base64_table[(cache >> 6) & 0x3f], filter->data));
141 CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
142 }
143 }
144 return 0;
145 }
146
147 /*
148 * BASE64 => any
149 */
mbfl_filt_conv_base64dec(int c,mbfl_convert_filter * filter)150 int mbfl_filt_conv_base64dec(int c, mbfl_convert_filter *filter)
151 {
152 int n;
153
154 if (c == 0x0d || c == 0x0a || c == 0x20 || c == 0x09 || c == 0x3d) { /* CR or LF or SPACE or HTAB or '=' */
155 return 0;
156 }
157
158 n = 0;
159 if (c >= 0x41 && c <= 0x5a) { /* A - Z */
160 n = c - 65;
161 } else if (c >= 0x61 && c <= 0x7a) { /* a - z */
162 n = c - 71;
163 } else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
164 n = c + 4;
165 } else if (c == 0x2b) { /* '+' */
166 n = 62;
167 } else if (c == 0x2f) { /* '/' */
168 n = 63;
169 }
170 n &= 0x3f;
171
172 switch (filter->status) {
173 case 0:
174 filter->status = 1;
175 filter->cache = n << 18;
176 break;
177 case 1:
178 filter->status = 2;
179 filter->cache |= n << 12;
180 break;
181 case 2:
182 filter->status = 3;
183 filter->cache |= n << 6;
184 break;
185 default:
186 filter->status = 0;
187 n |= filter->cache;
188 CK((*filter->output_function)((n >> 16) & 0xff, filter->data));
189 CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
190 CK((*filter->output_function)(n & 0xff, filter->data));
191 break;
192 }
193
194 return 0;
195 }
196
mbfl_filt_conv_base64dec_flush(mbfl_convert_filter * filter)197 int mbfl_filt_conv_base64dec_flush(mbfl_convert_filter *filter)
198 {
199 int status, cache;
200
201 status = filter->status;
202 cache = filter->cache;
203 filter->status = 0;
204 filter->cache = 0;
205 /* flush fragments */
206 if (status >= 2) {
207 CK((*filter->output_function)((cache >> 16) & 0xff, filter->data));
208 if (status >= 3) {
209 CK((*filter->output_function)((cache >> 8) & 0xff, filter->data));
210 }
211 }
212 return 0;
213 }
214
