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libuna_base64_stream.c
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/*
* Base64 stream functions
*
* Copyright (c) 2008-2013, Joachim Metz <[email protected]>
*
* Refer to AUTHORS for acknowledgements.
*
* This software is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This software 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 Lesser General Public License
* along with this software. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <byte_stream.h>
#include <types.h>
#include "libuna_base64_stream.h"
#include "libuna_definitions.h"
#include "libuna_inline.h"
#include "libuna_libcerror.h"
#include "libuna_types.h"
static uint8_t *libuna_base64_sixtet_to_character_table = \
(uint8_t *) "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static uint8_t *libuna_base64url_sixtet_to_character_table = \
(uint8_t *) "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
/* Copies a base64 character to a base64 sixtet
* Returns 1 if successful or -1 on error
*/
LIBUNA_INLINE \
int libuna_base64_character_copy_to_sixtet(
uint8_t base64_character,
uint8_t *base64_sixtet,
uint32_t base64_variant,
libcerror_error_t **error )
{
static char *function = "libuna_base64_character_copy_to_sixtet";
uint8_t base64_character_62 = 0;
uint8_t base64_character_63 = 0;
if( base64_sixtet == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 sixtet.",
function );
return( -1 );
}
switch( base64_variant & 0x000f0000UL )
{
case LIBUNA_BASE64_VARIANT_ALPHABET_NORMAL:
base64_character_62 = (uint8_t) '+';
base64_character_63 = (uint8_t) '/';
break;
case LIBUNA_BASE64_VARIANT_ALPHABET_URL:
base64_character_62 = (uint8_t) '-';
base64_character_63 = (uint8_t) '_';
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
/* A-Z is not a continous range on a EBCDIC based system
* it consists of the ranges: A-I, J-R, S-Z
*/
if( ( base64_character >= (uint8_t) 'A' )
&& ( base64_character <= (uint8_t) 'I' ) )
{
*base64_sixtet = base64_character - (uint8_t) 'A';
}
else if( ( base64_character >= (uint8_t) 'J' )
&& ( base64_character <= (uint8_t) 'R' ) )
{
*base64_sixtet = base64_character - (uint8_t) 'J' + 9;
}
else if( ( base64_character >= (uint8_t) 'S' )
&& ( base64_character <= (uint8_t) 'Z' ) )
{
*base64_sixtet = base64_character - (uint8_t) 'S' + 18;
}
/* a-z is not a continous range on a EBCDIC based system
* it consists of the ranges: a-i, j-r, s-z
*/
else if( ( base64_character >= (uint8_t) 'a' )
&& ( base64_character <= (uint8_t) 'i' ) )
{
*base64_sixtet = base64_character - (uint8_t) 'a' + 26;
}
else if( ( base64_character >= (uint8_t) 'j' )
&& ( base64_character <= (uint8_t) 'r' ) )
{
*base64_sixtet = base64_character - (uint8_t) 'j' + 35;
}
else if( ( base64_character >= (uint8_t) 's' )
&& ( base64_character <= (uint8_t) 'z' ) )
{
*base64_sixtet = base64_character - (uint8_t) 's' + 44;
}
else if( ( base64_character >= (uint8_t) '0' )
&& ( base64_character <= (uint8_t) '9' ) )
{
*base64_sixtet = base64_character - (uint8_t) '0' + 52;
}
else if( base64_character == base64_character_62 )
{
*base64_sixtet = 62;
}
else if( base64_character == base64_character_63 )
{
*base64_sixtet = 63;
}
else
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid base64 character: 0x%02" PRIx8 ".",
function,
base64_character );
return( -1 );
}
return( 1 );
}
/* Copies a base64 triplet from a base64 stream
*
* The padding size will still be set to indicate the number of
* sixtets in the triplet
*
* Returns 1 if successful or -1 on error
*/
LIBUNA_INLINE \
int libuna_base64_triplet_copy_from_base64_stream(
uint32_t *base64_triplet,
const uint8_t *base64_stream,
size_t base64_stream_size,
size_t *base64_stream_index,
uint8_t *padding_size,
uint32_t base64_variant,
libcerror_error_t **error )
{
static char *function = "libuna_base64_triplet_copy_from_base64_stream";
size_t base64_character_size = 0;
size_t stream_index = 0;
uint32_t base64_character = 0;
uint8_t padding_character = 0;
uint8_t sixtet1 = 0;
uint8_t sixtet2 = 0;
uint8_t sixtet3 = 0;
uint8_t sixtet4 = 0;
if( base64_triplet == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 triplet.",
function );
return( -1 );
}
if( base64_stream == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 stream.",
function );
return( -1 );
}
if( base64_stream_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid base64 stream size value exceeds maximum.",
function );
return( -1 );
}
if( base64_stream_index == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 stream index.",
function );
return( -1 );
}
if( *base64_stream_index >= base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: base64 stream string too small.",
function );
return( -1 );
}
if( padding_size == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid padding size.",
function );
return( -1 );
}
switch( base64_variant & 0x0f000000UL )
{
case LIBUNA_BASE64_VARIANT_PADDING_NONE:
padding_character = 0;
break;
case LIBUNA_BASE64_VARIANT_PADDING_OPTIONAL:
padding_character = (uint8_t) '=';
break;
case LIBUNA_BASE64_VARIANT_PADDING_REQUIRED:
padding_character = (uint8_t) '=';
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character_size = 1;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
base64_character_size = 2;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
base64_character_size = 4;
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
stream_index = *base64_stream_index;
if( ( stream_index + base64_character_size ) > base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: missing 1st base64 character.",
function );
return( -1 );
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character = base64_stream[ stream_index ];
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_to_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_to_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_to_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_to_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
if( ( base64_character & 0xffffff00UL ) != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 1st base64 character.",
function );
return( -1 );
}
if( libuna_base64_character_copy_to_sixtet(
(uint8_t) base64_character,
&sixtet1,
base64_variant,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_CONVERSION,
LIBCERROR_CONVERSION_ERROR_INPUT_FAILED,
"%s: unable to copy base64 character to 1st sixtet.",
function );
return( -1 );
}
if( ( stream_index + base64_character_size ) > base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: missing 2nd base64 character.",
function );
return( -1 );
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character = base64_stream[ stream_index ];
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_to_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_to_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_to_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_to_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
if( ( base64_character & 0xffffff00UL ) != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 2nd base64 character.",
function );
return( -1 );
}
if( libuna_base64_character_copy_to_sixtet(
(uint8_t) base64_character,
&sixtet2,
base64_variant,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_CONVERSION,
LIBCERROR_CONVERSION_ERROR_INPUT_FAILED,
"%s: unable to copy base64 character to 2nd sixtet.",
function );
return( -1 );
}
*padding_size = 2;
if( ( stream_index + base64_character_size ) <= base64_stream_size )
{
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character = base64_stream[ stream_index ];
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_to_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_to_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_to_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_to_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
if( ( base64_character & 0xffffff00UL ) != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 3rd base64 character.",
function );
return( -1 );
}
if( ( padding_character != 0 )
&& ( base64_character == (uint32_t) padding_character ) )
{
sixtet3 = 0;
}
else if( libuna_base64_character_copy_to_sixtet(
(uint8_t) base64_character,
&sixtet3,
base64_variant,
error ) != 1 )
{
if( padding_character != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 3rd base64 sixtet.",
function );
return( -1 );
}
libcerror_error_free(
error );
}
else
{
*padding_size -= 1;
}
}
else if( padding_character != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: missing 3rd base64 character.",
function );
return( -1 );
}
if( ( stream_index + base64_character_size ) <= base64_stream_size )
{
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character = base64_stream[ stream_index ];
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_to_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_to_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_to_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_to_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
if( ( base64_character & 0xffffff00UL ) != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 4th base64 character.",
function );
return( -1 );
}
if( ( padding_character != 0 )
&& ( base64_character == (uint32_t) padding_character ) )
{
sixtet4 = 0;
}
else if( *padding_size > 1 )
{
if( padding_character != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 4th base64 sixtet.",
function );
return( -1 );
}
}
else if( libuna_base64_character_copy_to_sixtet(
(uint8_t) base64_character,
&sixtet4,
base64_variant,
error ) != 1 )
{
if( padding_character != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: invalid 4rd base64 sixtet.",
function );
return( -1 );
}
libcerror_error_free(
error );
}
else
{
*padding_size -= 1;
}
}
else if( padding_character != 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: missing 4th base64 character.",
function );
return( -1 );
}
*base64_triplet = sixtet1;
*base64_triplet <<= 6;
*base64_triplet |= sixtet2;
*base64_triplet <<= 6;
*base64_triplet |= sixtet3;
*base64_triplet <<= 6;
*base64_triplet |= sixtet4;
*base64_stream_index = stream_index;
return( 1 );
}
/* Copies a base64 triplet to a base64 stream
* Returns 1 if successful or -1 on error
*/
LIBUNA_INLINE \
int libuna_base64_triplet_copy_to_base64_stream(
uint32_t base64_triplet,
uint8_t *base64_stream,
size_t base64_stream_size,
size_t *base64_stream_index,
uint8_t padding_size,
uint32_t base64_variant,
libcerror_error_t **error )
{
uint8_t *sixtet_to_character_table = NULL;
static char *function = "libuna_base64_triplet_copy_to_base64_stream";
size_t base64_character_size = 0;
size_t stream_index = 0;
uint32_t base64_character = 0;
uint8_t padding_character = 0;
uint8_t sixtet1 = 0;
uint8_t sixtet2 = 0;
uint8_t sixtet3 = 0;
uint8_t sixtet4 = 0;
if( base64_stream == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 stream.",
function );
return( -1 );
}
if( base64_stream_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid base64 stream size value exceeds maximum.",
function );
return( -1 );
}
if( base64_stream_index == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid base64 stream index.",
function );
return( -1 );
}
if( *base64_stream_index >= base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: base64 stream string too small.",
function );
return( -1 );
}
if( padding_size > 2 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
"%s: invalid padding size value out of bounds.",
function );
return( -1 );
}
switch( base64_variant & 0x000f0000UL )
{
case LIBUNA_BASE64_VARIANT_ALPHABET_NORMAL:
sixtet_to_character_table = libuna_base64_sixtet_to_character_table;
break;
case LIBUNA_BASE64_VARIANT_ALPHABET_URL:
sixtet_to_character_table = libuna_base64url_sixtet_to_character_table;
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
switch( base64_variant & 0x0f000000UL )
{
case LIBUNA_BASE64_VARIANT_PADDING_NONE:
case LIBUNA_BASE64_VARIANT_PADDING_OPTIONAL:
padding_character = 0;
break;
case LIBUNA_BASE64_VARIANT_PADDING_REQUIRED:
padding_character = (uint8_t) '=';
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_character_size = 1;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
base64_character_size = 2;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
base64_character_size = 4;
break;
default:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
"%s: unsupported base64 variant.",
function );
return( -1 );
}
stream_index = *base64_stream_index;
/* Separate the 3 bytes value into 4 x 6 bit values
*/
sixtet4 = (uint8_t) ( base64_triplet & 0x3f );
base64_triplet >>= 6;
sixtet3 = (uint8_t) ( base64_triplet & 0x3f );
base64_triplet >>= 6;
sixtet2 = (uint8_t) ( base64_triplet & 0x3f );
base64_triplet >>= 6;
sixtet1 = (uint8_t) ( base64_triplet & 0x3f );
/* Spread the encoding over 2 characters if 1 byte is available
*/
if( ( stream_index + ( base64_character_size * 2 ) ) > base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: base64 stream is too small.",
function );
return( -1 );
}
base64_character = sixtet_to_character_table[ sixtet1 ];
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_stream[ stream_index ] = (uint8_t) base64_character;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_from_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_from_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_from_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_from_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
base64_character = sixtet_to_character_table[ sixtet2 ];
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_stream[ stream_index ] = (uint8_t) base64_character;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_from_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_from_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_from_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_from_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
/* Spread the encoding over 3 characters if 2 bytes are available
* Otherwise pad the remaining bytes if required
*/
if( ( stream_index + base64_character_size ) > base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: base64 stream is too small.",
function );
return( -1 );
}
if( ( padding_size < 2 )
|| ( padding_character != 0 ) )
{
if( padding_size < 2 )
{
base64_character = sixtet_to_character_table[ sixtet3 ];
}
else if( padding_character != 0 )
{
base64_character = padding_character;
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_stream[ stream_index ] = (uint8_t) base64_character;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_from_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_from_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_from_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_from_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
}
/* Spread the encoding over 4 characters if 3 bytes are available
* Otherwise pad the remaining bytes if required
*/
if( ( stream_index + base64_character_size ) > base64_stream_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: base64 stream is too small.",
function );
return( -1 );
}
if( ( padding_size < 1 )
|| ( padding_character != 0 ) )
{
if( padding_size < 1 )
{
base64_character = sixtet_to_character_table[ sixtet4 ];
}
else if( padding_character != 0 )
{
base64_character = padding_character;
}
switch( base64_variant & 0xf0000000UL )
{
case LIBUNA_BASE64_VARIANT_ENCODING_BYTE_STREAM:
base64_stream[ stream_index ] = (uint8_t) base64_character;
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_BIG_ENDIAN:
byte_stream_copy_from_uint16_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF16_LITTLE_ENDIAN:
byte_stream_copy_from_uint16_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_BIG_ENDIAN:
byte_stream_copy_from_uint32_big_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
case LIBUNA_BASE64_VARIANT_ENCODING_UTF32_LITTLE_ENDIAN:
byte_stream_copy_from_uint32_little_endian(
&( base64_stream[ stream_index ] ),
base64_character );
break;
}
stream_index += base64_character_size;
}
*base64_stream_index = stream_index;
return( 1 );
}
/* Copies a base64 triplet from a byte stream
* Returns 1 if successful or -1 on error
*/
LIBUNA_INLINE \
int libuna_base64_triplet_copy_from_byte_stream(
uint32_t *base64_triplet,
const uint8_t *byte_stream,
size_t byte_stream_size,
size_t *byte_stream_index,