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[uuid] Add uuid_aton() to parse a UUID from a string

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Add uuid_aton() to parse a UUID value from a string (analogous to
inet_aton(), inet6_aton(), sock_aton(), etc), treating it as a
32-digit hex string with optional hyphen separators.  The placement of
the separators is not checked: each byte within the hex string may be
separated by a hyphen, or not separated at all.

Add dedicated self-tests for UUID parsing and formatting (already
partially covered by the ":uuid" and ":guid" settings self-tests).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-02-29 13:58:50 +00:00
parent 182ee90931
commit da7b266289
7 changed files with 203 additions and 2 deletions
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src/core/base16.c
+13 -2
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@@ -78,12 +78,23 @@ int hex_decode ( char separator, const char *encoded, void *data, size_t len ) {
unsigned int count = 0;
unsigned int sixteens;
unsigned int units;
int optional;
/* Strip out optionality flag from separator character */
optional = ( separator & HEX_DECODE_OPTIONAL );
separator &= ~HEX_DECODE_OPTIONAL;
/* Decode string */
while ( *encoded ) {
/* Check separator, if applicable */
if ( count && separator && ( ( *(encoded++) != separator ) ) )
return -EINVAL;
if ( count && separator ) {
if ( *encoded == separator ) {
encoded++;
} else if ( ! optional ) {
return -EINVAL;
}
}
/* Extract digits. Note that either digit may be NUL,
* which would be interpreted as an invalid value by