| 0,0 → 1,123 |
|---|
| |
| #include "base64.h" |
| |
| ///=============== |
| |
| char base64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; |
| |
| ///=============== |
| |
| char* strchr (const char *s, int c) |
| { |
| do { |
| if (*s == c) |
| { |
| return (char*)s; |
| } |
| } while (*s++); |
| return (0); |
| } |
| |
| ///=============== |
| |
| int base64_encode(char inp[], char outp[], int len) |
| { |
| int i, j; |
| unsigned char chr[3]; |
| |
| for (i = 0, j=-1; i < len; i+=3) |
| { |
| chr[0] = (unsigned char) inp[i]; |
| if (i < len) |
| { |
| chr[1] = (unsigned char) inp[i+1]; |
| chr[2] = (unsigned char) inp[i+2]; |
| } |
| |
| outp[++j] = base64_table[ chr[0]>>2 ]; |
| outp[++j] = base64_table[ ((chr[0] & 3) << 4) | (chr[1] >> 4) ]; |
| |
| outp[++j] = base64_table[ ((chr[1] & 15) << 2) | (chr[2] >> 6) ]; |
| outp[++j] = base64_table[ chr[2] & 63 ]; |
| } |
| |
| switch (len%3) |
| { |
| case 1: |
| outp[j-1] = outp[j] = '='; |
| break; |
| |
| case 2: |
| outp[j] = '='; |
| break; |
| |
| default: |
| break; |
| |
| }; |
| |
| outp[j+1] = '\0'; |
| |
| return j+1; |
| } |
| |
| ///=============== |
| |
| int base64_decode(char inp[], char outp[], int len) |
| { |
| int i, j, k; |
| char chr[4]; |
| |
| for (i = 0, j=-1, k=0; i < len; i+=4) |
| { |
| chr[0] = strchr(base64_table, inp[i]) - base64_table; |
| |
| chr[1] = strchr(base64_table, inp[i+1]) - base64_table; |
| |
| if (inp[i+2] == '=') |
| { |
| chr[2] = 0; |
| k++; |
| } |
| else |
| chr[2] = strchr(base64_table, inp[i+2]) - base64_table; |
| |
| if (inp[i+3] == '=') |
| { |
| chr[3] = 0; |
| k++; |
| } |
| else |
| chr[3] = strchr(base64_table, inp[i+3]) - base64_table; |
| |
| outp[++j] = ((chr[0] << 2) | (chr[1] >> 4)); |
| outp[++j] = ((chr[1] << 4) | (chr[2] >> 2)); |
| outp[++j] = ((chr[2] & 0x03 )<< 6) | (chr[3] & 0x3f); |
| } |
| |
| outp[j+1-k] = '\0'; |
| |
| return j+1-k; |
| } |
| |
| ///=============== |
| |
| #define NULL ((void*)0) |
| |
| typedef struct |
| { |
| void *name; |
| void *function; |
| } export_t; |
| |
| char szbase64_encode[]={"base64_encode"}; |
| char szbase64_decode[]={"base64_decode"}; |
| |
| export_t EXPORTS[] = |
| { |
| {szbase64_encode, (void*) base64_encode}, |
| {szbase64_decode, (void*) base64_decode}, |
| { NULL, NULL }, |
| }; |
| |
| ///=============== |