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[base64] Add base64 encoding functions
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Michael Brown
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Feb 13, 2009
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/* | ||
* 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. | ||
*/ | ||
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#include <stdint.h> | ||
#include <string.h> | ||
#include <assert.h> | ||
#include <gpxe/base64.h> | ||
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/** @file | ||
* | ||
* Base64 encoding | ||
* | ||
*/ | ||
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static const char base64[64] = | ||
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | ||
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/** | ||
* Base64-encode a string | ||
* | ||
* @v raw Raw string | ||
* @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 ( strlen ( raw ) ) + 1 ]; | ||
* | ||
* (the +1 is for the terminating NUL) to provide a buffer of the | ||
* correct size. | ||
*/ | ||
void base64_encode ( const char *raw, char *encoded ) { | ||
const uint8_t *raw_bytes = ( ( const uint8_t * ) raw ); | ||
uint8_t *encoded_bytes = ( ( uint8_t * ) encoded ); | ||
size_t raw_bit_len = ( 8 * strlen ( raw ) ); | ||
unsigned int bit; | ||
unsigned int tmp; | ||
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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'; | ||
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DBG ( "Base64-encoded \"%s\" as \"%s\"\n", raw, encoded ); | ||
assert ( strlen ( encoded ) == base64_encoded_len ( strlen ( raw ) ) ); | ||
} |
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#ifndef _GPXE_BASE64_H | ||
#define _GPXE_BASE64_H | ||
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/** @file | ||
* | ||
* Base64 encoding | ||
* | ||
*/ | ||
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#include <stdint.h> | ||
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/** | ||
* Calculate length of base64-encoded string | ||
* | ||
* @v raw_len Raw string length (excluding NUL) | ||
* @ret encoded_len Encoded string length (excluding NUL) | ||
*/ | ||
static inline size_t base64_encoded_len ( size_t raw_len ) { | ||
return ( ( ( raw_len + 3 - 1 ) / 3 ) * 4 ); | ||
} | ||
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extern void base64_encode ( const char *raw, char *encoded ); | ||
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#endif /* _GPXE_BASE64_H */ |