Annotation of embedaddon/php/ext/mbstring/libmbfl/filters/mbfilter_base64.c, revision 1.1.1.2
1.1 misho 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,
1.1.1.2 ! misho 44: MBFL_ENCTYPE_ENC_STRM | MBFL_ENCTYPE_GL_UNSAFE
1.1 misho 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:
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:
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: */
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:
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:
214:
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