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[efi] Add efi_path_uri() to parse a URI from an EFI device path 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1130/merge
Michael Brown 2024-03-19 15:01:25 +00:00
parent 88c2a01e1a
commit 1a84facf12
2 changed files with 41 additions and 0 deletions
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1
src/include/ipxe/efi/efi_path.h
View File

@ -45,6 +45,7 @@ efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path );
extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path );
extern unsigned int efi_path_vlan ( EFI_DEVICE_PATH_PROTOCOL *path );
extern int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *uuid );
extern struct uri * efi_path_uri ( EFI_DEVICE_PATH_PROTOCOL *path );
extern EFI_DEVICE_PATH_PROTOCOL * efi_paths ( EFI_DEVICE_PATH_PROTOCOL *first,
... );
extern EFI_DEVICE_PATH_PROTOCOL * efi_netdev_path ( struct net_device *netdev );

40
src/interface/efi/efi_path.c
View File

@ -175,6 +175,46 @@ int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *guid ) {
return rc;
}
/**
* Parse URI from device path
*
* @v path Device path
* @ret uri URI, or NULL if not a URI
*/
struct uri * efi_path_uri ( EFI_DEVICE_PATH_PROTOCOL *path ) {
EFI_DEVICE_PATH_PROTOCOL *next;
URI_DEVICE_PATH *uripath;
char *uristring;
struct uri *uri;
size_t len;
/* Search for URI device path */
for ( ; ( next = efi_path_next ( path ) ) ; path = next ) {
if ( ( path->Type == MESSAGING_DEVICE_PATH ) &&
( path->SubType == MSG_URI_DP ) ) {
/* Calculate path length */
uripath = container_of ( path, URI_DEVICE_PATH,
Header );
len = ( ( ( path->Length[1] << 8 ) | path->Length[0] )
- offsetof ( typeof ( *uripath ), Uri ) );
/* Parse URI */
uristring = zalloc ( len + 1 /* NUL */ );
if ( ! uristring )
return NULL;
memcpy ( uristring, uripath->Uri, len );
uri = parse_uri ( uristring );
free ( uristring );
return uri;
}
}
/* No URI path found */
return NULL;
}
/**
* Concatenate EFI device paths
*