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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/core/base16.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/core/base16.c')
-rw-r--r-- | qemu/roms/ipxe/src/core/base16.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/core/base16.c b/qemu/roms/ipxe/src/core/base16.c new file mode 100644 index 000000000..bf9cc21bb --- /dev/null +++ b/qemu/roms/ipxe/src/core/base16.c @@ -0,0 +1,135 @@ +/* + * Copyright (C) 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> +#include <ipxe/base16.h> + +/** @file + * + * Base16 encoding + * + */ + +/** + * Base16-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[ base16_encoded_len ( len ) + 1 ]; + * + * (the +1 is for the terminating NUL) to provide a buffer of the + * correct size. + */ +void base16_encode ( const uint8_t *raw, size_t len, char *encoded ) { + const uint8_t *raw_bytes = raw; + char *encoded_bytes = encoded; + size_t remaining = len; + + /* Encode each byte */ + for ( ; remaining-- ; encoded_bytes += 2 ) { + sprintf ( encoded_bytes, "%02x", *(raw_bytes++) ); + } + + /* Ensure terminating NUL exists even if length was zero */ + *encoded_bytes = '\0'; + + DBG ( "Base16-encoded to \"%s\":\n", encoded ); + DBG_HDA ( 0, raw, len ); + assert ( strlen ( encoded ) == base16_encoded_len ( len ) ); +} + +/** + * Decode hexadecimal string + * + * @v encoded Encoded string + * @v separator Byte separator character, or 0 for no separator + * @v data Buffer + * @v len Length of buffer + * @ret len Length of data, or negative error + */ +int hex_decode ( const char *encoded, char separator, void *data, size_t len ) { + uint8_t *out = data; + unsigned int count = 0; + unsigned int sixteens; + unsigned int units; + + while ( *encoded ) { + + /* Check separator, if applicable */ + if ( count && separator && ( ( *(encoded++) != separator ) ) ) + return -EINVAL; + + /* Extract digits. Note that either digit may be NUL, + * which would be interpreted as an invalid value by + * strtoul_charval(); there is therefore no need for an + * explicit end-of-string check. + */ + sixteens = strtoul_charval ( *(encoded++) ); + if ( sixteens >= 16 ) + return -EINVAL; + units = strtoul_charval ( *(encoded++) ); + if ( units >= 16 ) + return -EINVAL; + + /* Store result */ + if ( count < len ) + out[count] = ( ( sixteens << 4 ) | units ); + count++; + + } + return count; +} + +/** + * Base16-decode data + * + * @v encoded Encoded string + * @v raw Raw data + * @ret len Length of raw data, or negative error + * + * The buffer must be large enough to contain the decoded data. Use + * something like + * + * char buf[ base16_decoded_max_len ( encoded ) ]; + * + * to provide a buffer of the correct size. + */ +int base16_decode ( const char *encoded, uint8_t *raw ) { + int len; + + len = hex_decode ( encoded, 0, raw, -1UL ); + if ( len < 0 ) + return len; + + DBG ( "Base16-decoded \"%s\" to:\n", encoded ); + DBG_HDA ( 0, raw, len ); + assert ( len <= ( int ) base16_decoded_max_len ( encoded ) ); + + return len; +} |