diff options
Diffstat (limited to 'src/microhttpd/base64.c')
-rw-r--r-- | src/microhttpd/base64.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/microhttpd/base64.c b/src/microhttpd/base64.c new file mode 100644 index 00000000..4fb4755e --- /dev/null +++ b/src/microhttpd/base64.c @@ -0,0 +1,62 @@ +/* + * This code implements the BASE64 algorithm. + * This code is in the public domain; do with it what you wish. + * + * @file base64.c + * @brief This code implements the BASE64 algorithm + * @author Matthieu Speder + */ +#include "base64.h" + +static const char base64_chars[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +static const char base64_digits[] = + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, + 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, + 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, + 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, + 45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; + + +char * +BASE64Decode(const char* src) +{ + size_t in_len = strlen (src); + char* dest; + char* result; + + if (in_len % 4) + { + /* Wrong base64 string length */ + return NULL; + } + result = dest = malloc(in_len / 4 * 3 + 1); + if (result == NULL) + return NULL; /* out of memory */ + while (*src) { + char a = base64_digits[(unsigned char)*(src++)]; + char b = base64_digits[(unsigned char)*(src++)]; + char c = base64_digits[(unsigned char)*(src++)]; + char d = base64_digits[(unsigned char)*(src++)]; + *(dest++) = (a << 2) | ((b & 0x30) >> 4); + if (c == (char)-1) + break; + *(dest++) = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2); + if (d == (char)-1) + break; + *(dest++) = ((c & 0x03) << 6) | d; + } + *dest = 0; + return result; +} + + +/* end of base64.c */ |