/* base64_enc.c */
/*
* This file is part of the AVR-Crypto-Lib.
- * Copyright (C) 2006, 2007, 2008 Daniel Otte (daniel.otte@rub.de)
+ * Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
/**
* base64 encoder (RFC3548)
* Author: Daniel Otte
#if 1
#include <avr/pgmspace.h>
-char base64_alphabet[64] PROGMEM = {
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
- 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
- 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
- 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
- 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
- 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
- 'w', 'x', 'y', 'z', '0', '1', '2', '3',
- '4', '5', '6', '7', '8', '9', '+', '/' };
+const char base64_alphabet[64] PROGMEM = {
+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+ 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+ 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+ 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+ 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+ 'w', 'x', 'y', 'z', '0', '1', '2', '3',
+ '4', '5', '6', '7', '8', '9', '+', '/' };
-static
-char bit6toAscii(uint8_t a){
- a &= (uint8_t)0x3F;
- return pgm_read_byte(base64_alphabet+a);
+static
+char bit6toAscii(uint8_t a)
+{
+ a &= (uint8_t) 0x3F;
+ return pgm_read_byte(base64_alphabet + a);
}
#else
-static
-char bit6toAscii(uint8_t a){
- a &= (uint8_t)0x3F;
-
- if(a<=25){
- return a+'A';
- } else {
- if(a<=51){
- return a-26+'a';
- } else {
- if(a<=61){
- return a-52+'0';
- } else {
- if(a==62){
- return '+';
- } else {
- return '/'; /* a == 63 */
- }
- }
- }
- }
+static
+char bit6toAscii(uint8_t a) {
+ a &= (uint8_t)0x3F;
+
+ if(a<=25) {
+ return a+'A';
+ } else {
+ if(a<=51) {
+ return a-26+'a';
+ } else {
+ if(a<=61) {
+ return a-52+'0';
+ } else {
+ if(a==62) {
+ return '+';
+ } else {
+ return '/'; /* a == 63 */
+ }
+ }
+ }
+ }
}
#endif
-void base64enc(char* dest,const void* src, uint16_t length){
- uint16_t i,j;
- uint8_t a[4];
- for(i=0; i<length/3; ++i){
- a[0]= (((uint8_t*)src)[i*3+0])>>2;
- a[1]= (((((uint8_t*)src)[i*3+0])<<4) | ((((uint8_t*)src)[i*3+1])>>4)) & 0x3F;
- a[2]= (((((uint8_t*)src)[i*3+1])<<2) | ((((uint8_t*)src)[i*3+2])>>6)) & 0x3F;
- a[3]= (((uint8_t*)src)[i*3+2]) & 0x3F;
- for(j=0; j<4; ++j){
- *dest++=bit6toAscii(a[j]);
- }
- }
- /* now we do the rest */
- switch(length%3){
- case 0:
- break;
- case 1:
- a[0]=(((uint8_t*)src)[i*3+0])>>2;
- a[1]=((((uint8_t*)src)[i*3+0])<<4)&0x3F;
- *dest++ = bit6toAscii(a[0]);
- *dest++ = bit6toAscii(a[1]);
- *dest++ = '=';
- *dest++ = '=';
- break;
- case 2:
- a[0]= (((uint8_t*)src)[i*3+0])>>2;
- a[1]= (((((uint8_t*)src)[i*3+0])<<4) | ((((uint8_t*)src)[i*3+1])>>4)) & 0x3F;
- a[2]= ((((uint8_t*)src)[i*3+1])<<2) & 0x3F;
- *dest++ = bit6toAscii(a[0]);
- *dest++ = bit6toAscii(a[1]);
- *dest++ = bit6toAscii(a[2]);
- *dest++ = '=';
- break;
- default: /* this will not happen! */
- break;
- }
-/* finalize: */
- *dest='\0';
+void base64enc(char *dest, const void *src, uint16_t length)
+{
+ uint16_t i, j;
+ uint8_t a[4];
+ for (i = 0; i < length / 3; ++i) {
+ a[0] = (((uint8_t*) src)[i * 3 + 0]) >> 2;
+ a[1] = (((((uint8_t*) src)[i * 3 + 0]) << 4)
+ | ((((uint8_t*) src)[i * 3 + 1]) >> 4)) & 0x3F;
+ a[2] = (((((uint8_t*) src)[i * 3 + 1]) << 2)
+ | ((((uint8_t*) src)[i * 3 + 2]) >> 6)) & 0x3F;
+ a[3] = (((uint8_t*) src)[i * 3 + 2]) & 0x3F;
+ for (j = 0; j < 4; ++j) {
+ *dest++ = bit6toAscii(a[j]);
+ }
+ }
+ /* now we do the rest */
+ switch (length % 3) {
+ case 0:
+ break;
+ case 1:
+ a[0] = (((uint8_t*) src)[i * 3 + 0]) >> 2;
+ a[1] = ((((uint8_t*) src)[i * 3 + 0]) << 4) & 0x3F;
+ *dest++ = bit6toAscii(a[0]);
+ *dest++ = bit6toAscii(a[1]);
+ *dest++ = '=';
+ *dest++ = '=';
+ break;
+ case 2:
+ a[0] = (((uint8_t*) src)[i * 3 + 0]) >> 2;
+ a[1] = (((((uint8_t*) src)[i * 3 + 0]) << 4)
+ | ((((uint8_t*) src)[i * 3 + 1]) >> 4)) & 0x3F;
+ a[2] = ((((uint8_t*) src)[i * 3 + 1]) << 2) & 0x3F;
+ *dest++ = bit6toAscii(a[0]);
+ *dest++ = bit6toAscii(a[1]);
+ *dest++ = bit6toAscii(a[2]);
+ *dest++ = '=';
+ break;
+ default: /* this will not happen! */
+ break;
+ }
+ /* finalize: */
+ *dest = '\0';
}