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1 | /* |
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2 | |
3 | Copyright 1997-1999,2001 Gisle Aas |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the same terms as Perl itself. |
7 | |
8 | |
9 | The tables and some of the code that used to be here was borrowed from |
10 | metamail, which comes with this message: |
11 | |
12 | Copyright (c) 1991 Bell Communications Research, Inc. (Bellcore) |
13 | |
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14 | Permission to use, copy, modify, and distribute this material |
15 | for any purpose and without fee is hereby granted, provided |
16 | that the above copyright notice and this permission notice |
17 | appear in all copies, and that the name of Bellcore not be |
18 | used in advertising or publicity pertaining to this |
19 | material without the specific, prior written permission |
20 | of an authorized representative of Bellcore. BELLCORE |
21 | MAKES NO REPRESENTATIONS ABOUT THE ACCURACY OR SUITABILITY |
22 | OF THIS MATERIAL FOR ANY PURPOSE. IT IS PROVIDED "AS IS", |
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23 | WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. |
24 | |
25 | */ |
26 | |
27 | |
28 | #ifdef __cplusplus |
29 | extern "C" { |
30 | #endif |
31 | #include "EXTERN.h" |
32 | #include "perl.h" |
33 | #include "XSUB.h" |
34 | #ifdef __cplusplus |
35 | } |
36 | #endif |
37 | |
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38 | |
39 | #define MAX_LINE 76 /* size of encoded lines */ |
40 | |
41 | static char basis_64[] = |
42 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
43 | |
44 | #define XX 255 /* illegal base64 char */ |
45 | #define EQ 254 /* padding */ |
46 | #define INVALID XX |
47 | |
48 | static unsigned char index_64[256] = { |
49 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
50 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
51 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,62, XX,XX,XX,63, |
52 | 52,53,54,55, 56,57,58,59, 60,61,XX,XX, XX,EQ,XX,XX, |
53 | XX, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
54 | 15,16,17,18, 19,20,21,22, 23,24,25,XX, XX,XX,XX,XX, |
55 | XX,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, |
56 | 41,42,43,44, 45,46,47,48, 49,50,51,XX, XX,XX,XX,XX, |
57 | |
58 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
59 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
60 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
61 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
62 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
63 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
64 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
65 | XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
66 | }; |
67 | |
68 | |
69 | |
70 | MODULE = MIME::Base64 PACKAGE = MIME::Base64 |
71 | |
72 | SV* |
73 | encode_base64(sv,...) |
74 | SV* sv |
75 | PROTOTYPE: $;$ |
76 | |
77 | PREINIT: |
78 | char *str; /* string to encode */ |
79 | SSize_t len; /* length of the string */ |
80 | char *eol; /* the end-of-line sequence to use */ |
81 | STRLEN eollen; /* length of the EOL sequence */ |
82 | char *r; /* result string */ |
83 | STRLEN rlen; /* length of result string */ |
84 | unsigned char c1, c2, c3; |
85 | int chunk; |
86 | |
87 | CODE: |
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88 | sv_utf8_downgrade(sv, FALSE); |
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89 | str = SvPV(sv, rlen); /* SvPV(sv, len) gives warning for signed len */ |
90 | len = (SSize_t)rlen; |
91 | |
92 | /* set up EOL from the second argument if present, default to "\n" */ |
93 | if (items > 1 && SvOK(ST(1))) { |
94 | eol = SvPV(ST(1), eollen); |
95 | } else { |
96 | eol = "\n"; |
97 | eollen = 1; |
98 | } |
99 | |
100 | /* calculate the length of the result */ |
101 | rlen = (len+2) / 3 * 4; /* encoded bytes */ |
102 | if (rlen) { |
103 | /* add space for EOL */ |
104 | rlen += ((rlen-1) / MAX_LINE + 1) * eollen; |
105 | } |
106 | |
107 | /* allocate a result buffer */ |
108 | RETVAL = newSV(rlen ? rlen : 1); |
109 | SvPOK_on(RETVAL); |
110 | SvCUR_set(RETVAL, rlen); |
111 | r = SvPVX(RETVAL); |
112 | |
113 | /* encode */ |
114 | for (chunk=0; len > 0; len -= 3, chunk++) { |
115 | if (chunk == (MAX_LINE/4)) { |
116 | char *c = eol; |
117 | char *e = eol + eollen; |
118 | while (c < e) |
119 | *r++ = *c++; |
120 | chunk = 0; |
121 | } |
122 | c1 = *str++; |
123 | c2 = *str++; |
124 | *r++ = basis_64[c1>>2]; |
125 | *r++ = basis_64[((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)]; |
126 | if (len > 2) { |
127 | c3 = *str++; |
128 | *r++ = basis_64[((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)]; |
129 | *r++ = basis_64[c3 & 0x3F]; |
130 | } else if (len == 2) { |
131 | *r++ = basis_64[(c2 & 0xF) << 2]; |
132 | *r++ = '='; |
133 | } else { /* len == 1 */ |
134 | *r++ = '='; |
135 | *r++ = '='; |
136 | } |
137 | } |
138 | if (rlen) { |
139 | /* append eol to the result string */ |
140 | char *c = eol; |
141 | char *e = eol + eollen; |
142 | while (c < e) |
143 | *r++ = *c++; |
144 | } |
145 | *r = '\0'; /* every SV in perl should be NUL-terminated */ |
146 | |
147 | OUTPUT: |
148 | RETVAL |
149 | |
150 | SV* |
151 | decode_base64(sv) |
152 | SV* sv |
153 | PROTOTYPE: $ |
154 | |
155 | PREINIT: |
156 | STRLEN len; |
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157 | register unsigned char *str = (unsigned char*)SvPVbyte(sv, len); |
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158 | unsigned char const* end = str + len; |
159 | char *r; |
160 | unsigned char c[4]; |
161 | |
162 | CODE: |
163 | { |
164 | /* always enough, but might be too much */ |
165 | STRLEN rlen = len * 3 / 4; |
166 | RETVAL = newSV(rlen ? rlen : 1); |
167 | } |
168 | SvPOK_on(RETVAL); |
169 | r = SvPVX(RETVAL); |
170 | |
171 | while (str < end) { |
172 | int i = 0; |
173 | do { |
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174 | unsigned char uc = index_64[NATIVE_TO_ASCII(*str++)]; |
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175 | if (uc != INVALID) |
176 | c[i++] = uc; |
177 | |
178 | if (str == end) { |
179 | if (i < 4) { |
180 | if (i && PL_dowarn) |
181 | warn("Premature end of base64 data"); |
182 | if (i < 2) goto thats_it; |
183 | if (i == 2) c[2] = EQ; |
184 | c[3] = EQ; |
185 | } |
186 | break; |
187 | } |
188 | } while (i < 4); |
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189 | |
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190 | if (c[0] == EQ || c[1] == EQ) { |
191 | if (PL_dowarn) warn("Premature padding of base64 data"); |
192 | break; |
193 | } |
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194 | /* printf("c0=%d,c1=%d,c2=%d,c3=%d\n", c[0],c[1],c[2],c[3]);*/ |
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195 | |
196 | *r++ = (c[0] << 2) | ((c[1] & 0x30) >> 4); |
197 | |
198 | if (c[2] == EQ) |
199 | break; |
200 | *r++ = ((c[1] & 0x0F) << 4) | ((c[2] & 0x3C) >> 2); |
201 | |
202 | if (c[3] == EQ) |
203 | break; |
204 | *r++ = ((c[2] & 0x03) << 6) | c[3]; |
205 | } |
206 | |
207 | thats_it: |
208 | SvCUR_set(RETVAL, r - SvPVX(RETVAL)); |
209 | *r = '\0'; |
210 | |
211 | OUTPUT: |
212 | RETVAL |