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Add uuid support to extfs.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-10-01 16:50:47 +02:00
parent f6b1056de8
commit 572481098a
1 changed files with 76 additions and 1 deletions
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77
ext/extfs.cpp
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@ -1202,6 +1202,66 @@ int ext2_fuse_utimens(const char* path, const struct timespec tv[2])
#endif
static bool is_hex_digit(char c)
{
return ('0' <= c && c <= '9') ||
('a' <= c && c <= 'f') ||
('A' <= c && c <= 'F');
}
static bool is_valid_uuid(const char* uuid)
{
if ( strlen(uuid) != 36 )
return false;
// Format: 01234567-0123-0123-0123-0123456789AB
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;
}
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;
}
static void uuid_from_string(uint8_t uuid[16], const char* string)
{
assert(is_valid_uuid(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;
}
assert(string[i + 1] != '\0');
uuid[output_index++] = debase(string[i + 0]) << 4 |
debase(string[i + 1]) << 0;
i += 2;
}
assert(string[i] == '\0');
}
void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
@ -1332,7 +1392,22 @@ int main(int argc, char* argv[])
// Test whether this was the filesystem the user was looking for.
if ( test_uuid )
{
// TODO: Test uuid!
if ( !is_valid_uuid(test_uuid) )
{
if ( !probe )
error(1, 0, "`%s' isn't a valid uuid", test_uuid);
exit(1);
}
uint8_t uuid[16];
uuid_from_string(uuid, test_uuid);
if ( memcmp(sb.s_uuid, uuid, 16) != 0 )
{
if ( !probe )
error(1, 0, "uuid `%s' did not match the ext2 filesystem at `%s'", test_uuid, device_path);
exit(1);
}
}
// Test whether this revision of the extended filesystem is supported.