mirror of https://github.com/ipxe/ipxe.git
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
|
|
* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
|
|
*
|
|
* 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 the Free Software Foundation; either version 2 of the
|
|
* License, or any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER );
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <ipxe/base64.h>
|
|
|
|
/** @file
|
|
*
|
|
* Base64 encoding
|
|
*
|
|
*/
|
|
|
|
static const char base64[64] =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
|
|
/**
|
|
* Base64-encode data
|
|
*
|
|
* @v raw Raw data
|
|
* @v len Length of raw data
|
|
* @v encoded Buffer for encoded string
|
|
*
|
|
* The buffer must be the correct length for the encoded string. Use
|
|
* something like
|
|
*
|
|
* char buf[ base64_encoded_len ( len ) + 1 ];
|
|
*
|
|
* (the +1 is for the terminating NUL) to provide a buffer of the
|
|
* correct size.
|
|
*/
|
|
void base64_encode ( const uint8_t *raw, size_t len, char *encoded ) {
|
|
const uint8_t *raw_bytes = ( ( const uint8_t * ) raw );
|
|
uint8_t *encoded_bytes = ( ( uint8_t * ) encoded );
|
|
size_t raw_bit_len = ( 8 * len );
|
|
unsigned int bit;
|
|
unsigned int tmp;
|
|
|
|
for ( bit = 0 ; bit < raw_bit_len ; bit += 6 ) {
|
|
tmp = ( ( raw_bytes[ bit / 8 ] << ( bit % 8 ) ) |
|
|
( raw_bytes[ bit / 8 + 1 ] >> ( 8 - ( bit % 8 ) ) ) );
|
|
tmp = ( ( tmp >> 2 ) & 0x3f );
|
|
*(encoded_bytes++) = base64[tmp];
|
|
}
|
|
for ( ; ( bit % 8 ) != 0 ; bit += 6 )
|
|
*(encoded_bytes++) = '=';
|
|
*(encoded_bytes++) = '\0';
|
|
|
|
DBG ( "Base64-encoded to \"%s\":\n", encoded );
|
|
DBG_HDA ( 0, raw, len );
|
|
assert ( strlen ( encoded ) == base64_encoded_len ( len ) );
|
|
}
|