mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
125 lines
3 KiB
C
125 lines
3 KiB
C
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2015.
|
|
|
|
This file is part of Sortix libmount.
|
|
|
|
Sortix libmount 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.
|
|
|
|
Sortix libmount 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 Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with Sortix libmount. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
uuid.c
|
|
Universally unique identifier.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <assert.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
|
|
#include <mount/uuid.h>
|
|
|
|
static bool is_hex_digit(char c)
|
|
{
|
|
return ('0' <= c && c <= '9') ||
|
|
('a' <= c && c <= 'f') ||
|
|
('A' <= c && c <= 'F');
|
|
}
|
|
|
|
static char base(unsigned char bit4)
|
|
{
|
|
return "0123456789abcdef"[bit4];
|
|
}
|
|
|
|
static unsigned char debase(char c)
|
|
{
|
|
if ( '0' <= c && c <= '9' )
|
|
return (unsigned char) (c - '0');
|
|
if ( 'a' <= c && c <= 'f' )
|
|
return (unsigned char) (c - 'a' + 10);
|
|
if ( 'A' <= c && c <= 'F' )
|
|
return (unsigned char) (c - 'A' + 10);
|
|
return 0;
|
|
}
|
|
|
|
bool uuid_validate(const char* uuid)
|
|
{
|
|
// Format: 01234567-0123-0123-0123-0123456789AB
|
|
if ( strlen(uuid) != 36 )
|
|
return false;
|
|
for ( size_t i = 0; i < 36; i++ )
|
|
{
|
|
if ( i == 8 || i == 13 || i == 18 || i == 23 )
|
|
{
|
|
if ( uuid[i] != '-' )
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
if ( !is_hex_digit(uuid[i]) )
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void uuid_from_string(unsigned char uuid[16], const char* string)
|
|
{
|
|
size_t output_index = 0;
|
|
size_t i = 0;
|
|
while ( i < 36 )
|
|
{
|
|
assert(string[i + 0] != '\0');
|
|
if ( i == 8 || i == 13 || i == 18 || i == 23 )
|
|
{
|
|
i++;
|
|
continue;
|
|
}
|
|
uuid[output_index++] = debase(string[i + 0]) << 4 |
|
|
debase(string[i + 1]) << 0;
|
|
i += 2;
|
|
}
|
|
}
|
|
|
|
void uuid_to_string(const unsigned char uuid[16], char* string)
|
|
{
|
|
for ( size_t i = 0; i < 4; i++ )
|
|
{
|
|
*string++ = base((uuid[i] >> 4) & 0xF);
|
|
*string++ = base((uuid[i] >> 0) & 0xF);
|
|
}
|
|
*string++ = '-';
|
|
for ( size_t i = 4; i < 6; i++ )
|
|
{
|
|
*string++ = base((uuid[i] >> 4) & 0xF);
|
|
*string++ = base((uuid[i] >> 0) & 0xF);
|
|
}
|
|
*string++ = '-';
|
|
for ( size_t i = 6; i < 8; i++ )
|
|
{
|
|
*string++ = base((uuid[i] >> 4) & 0xF);
|
|
*string++ = base((uuid[i] >> 0) & 0xF);
|
|
}
|
|
*string++ = '-';
|
|
for ( size_t i = 8; i < 10; i++ )
|
|
{
|
|
*string++ = base((uuid[i] >> 4) & 0xF);
|
|
*string++ = base((uuid[i] >> 0) & 0xF);
|
|
}
|
|
*string++ = '-';
|
|
for ( size_t i = 10; i < 16; i++ )
|
|
{
|
|
*string++ = base((uuid[i] >> 4) & 0xF);
|
|
*string++ = base((uuid[i] >> 0) & 0xF);
|
|
}
|
|
*string = '\0';
|
|
}
|