1 static const char rcsid[] = "#(@) $Id$";
2
3 /*
4
5 Encode or decode file as MIME base64 (RFC 1341)
6
7 by John Walker
8 http://www.fourmilab.ch/
9
10 This program is in the public domain.
11
12 */
13 #include <stdio.h>
14
15 /* ENCODE -- Encode binary file into base64. */
16 #include <stdlib.h>
17 #include <ctype.h>
18 #include <php.h>
19
20 #include "base64.h"
21
22 static unsigned char dtable[512];
23
buffer_new(struct buffer_st * b)24 void buffer_new(struct buffer_st *b)
25 {
26 b->length = 512;
27 b->data = emalloc(sizeof(char)*(b->length));
28 b->data[0] = 0;
29 b->ptr = b->data;
30 b->offset = 0;
31 }
32
buffer_add(struct buffer_st * b,char c)33 void buffer_add(struct buffer_st *b, char c)
34 {
35 if ((INT_MAX - b->length) <= 512) {
36 return;
37 }
38 *(b->ptr++) = c;
39 b->offset++;
40 if (b->offset == b->length) {
41 b->length += 512;
42 b->data = erealloc(b->data, b->length);
43 b->ptr = b->data + b->offset;
44 }
45 }
46
buffer_delete(struct buffer_st * b)47 void buffer_delete(struct buffer_st *b)
48 {
49 efree(b->data);
50 b->length = 0;
51 b->offset = 0;
52 b->ptr = NULL;
53 b->data = NULL;
54 }
55
base64_encode_xmlrpc(struct buffer_st * b,const char * source,int length)56 void base64_encode_xmlrpc(struct buffer_st *b, const char *source, int length)
57 {
58 int i, hiteof = 0;
59 int offset = 0;
60
61 buffer_new(b);
62
63 /* Fill dtable with character encodings. */
64
65 for (i = 0; i < 26; i++) {
66 dtable[i] = 'A' + i;
67 dtable[26 + i] = 'a' + i;
68 }
69 for (i = 0; i < 10; i++) {
70 dtable[52 + i] = '0' + i;
71 }
72 dtable[62] = '+';
73 dtable[63] = '/';
74
75 while (!hiteof) {
76 unsigned char igroup[3], ogroup[4];
77 int c, n;
78
79 igroup[0] = igroup[1] = igroup[2] = 0;
80 for (n = 0; n < 3; n++) {
81 c = *(source++);
82 offset++;
83 if (offset > length || offset <= 0) {
84 hiteof = 1;
85 break;
86 }
87 igroup[n] = (unsigned char) c;
88 }
89 if (n > 0) {
90 ogroup[0] = dtable[igroup[0] >> 2];
91 ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
92 ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
93 ogroup[3] = dtable[igroup[2] & 0x3F];
94
95 /* Replace characters in output stream with "=" pad
96 characters if fewer than three characters were
97 read from the end of the input stream. */
98
99 if (n < 3) {
100 ogroup[3] = '=';
101 if (n < 2) {
102 ogroup[2] = '=';
103 }
104 }
105 for (i = 0; i < 4; i++) {
106 buffer_add(b, ogroup[i]);
107 if (!(b->offset % 72)) {
108 /* buffer_add(b, '\r'); */
109 buffer_add(b, '\n');
110 }
111 }
112 }
113 }
114 /* buffer_add(b, '\r'); */
115 buffer_add(b, '\n');
116 }
117
base64_decode_xmlrpc(struct buffer_st * bfr,const char * source,int length)118 void base64_decode_xmlrpc(struct buffer_st *bfr, const char *source, int length)
119 {
120 int i;
121 int offset = 0;
122 int endoffile;
123 int count;
124
125 buffer_new(bfr);
126
127 for (i = 0; i < 255; i++) {
128 dtable[i] = 0x80;
129 }
130 for (i = 'A'; i <= 'Z'; i++) {
131 dtable[i] = 0 + (i - 'A');
132 }
133 for (i = 'a'; i <= 'z'; i++) {
134 dtable[i] = 26 + (i - 'a');
135 }
136 for (i = '0'; i <= '9'; i++) {
137 dtable[i] = 52 + (i - '0');
138 }
139 dtable['+'] = 62;
140 dtable['/'] = 63;
141 dtable['='] = 0;
142
143 endoffile = 0;
144
145 /*CONSTANTCONDITION*/
146 while (1) {
147 unsigned char a[4], b[4], o[3];
148
149 for (i = 0; i < 4; i++) {
150 int c;
151 while (1) {
152 c = *(source++);
153 offset++;
154 if (offset > length) endoffile = 1;
155 if (isspace(c) || c == '\n' || c == '\r') continue;
156 break;
157 }
158
159 if (endoffile) {
160 /*
161 if (i > 0) {
162 fprintf(stderr, "Input file incomplete.\n");
163 exit(1);
164 }
165 */
166 return;
167 }
168
169 if (dtable[(unsigned char)c] & 0x80) {
170 /*
171 fprintf(stderr, "Offset %i length %i\n", offset, length);
172 fprintf(stderr, "character '%c:%x:%c' in input file.\n", c, c, dtable[c]);
173 exit(1);
174 */
175 i--;
176 continue;
177 }
178 a[i] = (unsigned char) c;
179 b[i] = (unsigned char) dtable[c];
180 }
181 o[0] = (b[0] << 2) | (b[1] >> 4);
182 o[1] = (b[1] << 4) | (b[2] >> 2);
183 o[2] = (b[2] << 6) | b[3];
184 i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3);
185 count = 0;
186 while (count < i) {
187 buffer_add(bfr, o[count++]);
188 }
189 if (i < 3) {
190 return;
191 }
192 }
193 }
194
