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base64.c
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1 /*
2  * This code implements the BASE64 algorithm.
3  * This code is in the public domain; do with it what you wish.
4  *
5  * @file base64.c
6  * @brief This code implements the BASE64 algorithm
7  * @author Matthieu Speder
8  */
9 #include "base64.h"
10 
11 static const char base64_chars[] =
12  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
13 
14 static const char base64_digits[] =
15  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
16  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17  0, 0, 0, 0, 0, 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
18  0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
19  14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26,
20  27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
21  45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
22  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
23  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
24  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
25  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
26  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
27 
28 
29 char *
30 BASE64Decode(const char* src)
31 {
32  size_t in_len = strlen (src);
33  char* dest;
34  char* result;
35 
36  if (in_len % 4)
37  {
38  /* Wrong base64 string length */
39  return NULL;
40  }
41  result = dest = malloc(in_len / 4 * 3 + 1);
42  if (result == NULL)
43  return NULL; /* out of memory */
44  while (*src) {
45  char a = base64_digits[(unsigned char)*(src++)];
46  char b = base64_digits[(unsigned char)*(src++)];
47  char c = base64_digits[(unsigned char)*(src++)];
48  char d = base64_digits[(unsigned char)*(src++)];
49  *(dest++) = (a << 2) | ((b & 0x30) >> 4);
50  if (c == (char)-1)
51  break;
52  *(dest++) = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
53  if (d == (char)-1)
54  break;
55  *(dest++) = ((c & 0x03) << 6) | d;
56  }
57  *dest = 0;
58  return result;
59 }
60 
61 
62 /* end of base64.c */
#define NULL
Definition: reason_phrase.c:31
static const char base64_chars[]
Definition: base64.c:11
static const char base64_digits[]
Definition: base64.c:14
char * BASE64Decode(const char *src)
Definition: base64.c:30