diff options
| -rw-r--r-- | gnu/build/file-systems.scm | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm index bbea4c766e..4ac672d96f 100644 --- a/gnu/build/file-systems.scm +++ b/gnu/build/file-systems.scm @@ -98,6 +98,22 @@ takes a bytevector and returns #t when it's a valid superblock." (define null-terminated-latin1->string (cut latin1->string <> zero?)) +(define (bytevector-utf16-length bv) + "Given a bytevector BV containing a NUL-terminated UTF16-encoded string, +determine where the NUL terminator is and return its index. If there's no +NUL terminator, return the size of the bytevector." + (let ((length (bytevector-length bv))) + (let loop ((index 0)) + (if (< index length) + (if (zero? (bytevector-u16-ref bv index 'little)) + index + (loop (+ index 2))) + length)))) + +(define (null-terminated-utf16->string bv endianness) + (utf16->string (sub-bytevector bv 0 (bytevector-utf16-length bv)) + endianness)) + ;;; ;;; Ext2 file systems. @@ -377,7 +393,9 @@ if DEVICE does not contain an F2FS file system." (define (f2fs-superblock-volume-name sblock) "Return the volume name of SBLOCK as a string of at most 512 characters, or #f if SBLOCK has no volume name." - (utf16->string (sub-bytevector sblock (- (+ #x470 12) #x400) 512) %f2fs-endianness)) + (null-terminated-utf16->string + (sub-bytevector sblock (- (+ #x470 12) #x400) 512) + %f2fs-endianness)) (define (check-f2fs-file-system device) "Return the health of a F2FS file system on DEVICE." |