2 * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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43 #include "util_base64.h"
46 #define GSSWEB_THREAD_ONCE INIT_ONCE
47 #define GSSWEB_ONCE_CALLBACK(cb) BOOL CALLBACK cb(PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
48 #define GSSWEB_ONCE_LEAVE do { return TRUE; } while (0)
49 #define GSSWEB_ONCE(o, i) InitOnceExecuteOnce((o), (i), NULL, NULL)
50 #define GSSWEB_ONCE_INITIALIZER INIT_ONCE_STATIC_INIT
52 #define GSSWEB_THREAD_ONCE pthread_once_t
53 #define GSSWEB_ONCE_CALLBACK(cb) void cb(void)
54 #define GSSWEB_ONCE(o, i) pthread_once((o), (i))
55 #define GSSWEB_ONCE_INITIALIZER PTHREAD_ONCE_INIT
56 #define GSSWEB_ONCE_LEAVE do { } while (0)
60 base64Size(const char *str);
62 #define BASE64_EXPAND(n) (n * 4 / 3 + 4)
64 static const char base64_chars[] =
65 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
66 static char base64_decode[SCHAR_MAX];
68 static GSSWEB_ONCE_CALLBACK(init_decode_table)
71 memset(&base64_decode[0], -1, sizeof(base64_decode));
72 for (i = 0; i < sizeof(base64_chars) / sizeof(base64_chars[0]); i++)
73 base64_decode[(unsigned int)base64_chars[i]] = (char )i;
82 return base64_decode[(unsigned int)c];
86 base64EncodeStr(const void *data, size_t size, std::string &str)
89 char *s = base64Encode(data, size);
95 base64Encode(const void *data, size_t size)
100 const unsigned char *q;
102 if (size > INT_MAX/4 || size < 0) {
106 p = s = (char *)malloc(BASE64_EXPAND(size));
110 q = (const unsigned char *) data;
112 for (i = 0; i < size;) {
122 p[0] = base64_chars[(c & 0x00fc0000) >> 18];
123 p[1] = base64_chars[(c & 0x0003f000) >> 12];
124 p[2] = base64_chars[(c & 0x00000fc0) >> 6];
125 p[3] = base64_chars[(c & 0x0000003f) >> 0];
136 #define DECODE_ERROR 0xffffffff
139 token_decode(const char *token)
142 unsigned int val = 0;
143 unsigned int marker = 0;
145 for (i = 0; i < 4; i++) {
152 decode = pos(token[i]);
160 return (marker << 24) | val;
164 base64Decode(const char *str, size_t *size)
166 static GSSWEB_THREAD_ONCE decode_table_once = GSSWEB_ONCE_INITIALIZER;
170 GSSWEB_ONCE(&decode_table_once, init_decode_table);
172 *size = base64Size(str);
174 data = malloc(*size);
178 q = static_cast<unsigned char *>(data);
182 unsigned int val = token_decode(p);
183 unsigned int marker = (val >> 24) & 0xff;
184 if (val == DECODE_ERROR) {
189 *q++ = (val >> 16) & 0xff;
191 *q++ = (val >> 8) & 0xff;
201 /* Return the size, in bytes, of the data encoded by str
202 * Return -1 if str is not a valid base64 encoding
205 base64Size(const char *str)
211 unsigned int val = token_decode(p);
212 unsigned int marker = (val >> 24) & 0x3;
213 if (val == DECODE_ERROR)
225 base64Free(void *mem)