From 8a7d81a5e23c4d59fbabf2550db32d4ba5572e4b Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Fri, 22 Sep 2017 18:25:21 +0200
Subject: uuid: Add a parser for FAT32 UUIDs.

* gnu/system/uuid.scm (%fat32-uuid-rx): New variable.
(string->fat32-uuid): New procedure.
(%uuid-parsers): Add it.
* tests/uuid.scm ("uuid, FAT32, format preserved"): New test.
---
 gnu/system/uuid.scm | 18 ++++++++++++++++++
 tests/uuid.scm      |  4 ++++
 2 files changed, 22 insertions(+)

diff --git a/gnu/system/uuid.scm b/gnu/system/uuid.scm
index 1dd6a11339..6470abb8cc 100644
--- a/gnu/system/uuid.scm
+++ b/gnu/system/uuid.scm
@@ -41,6 +41,7 @@ (define-module (gnu system uuid)
             string->ext3-uuid
             string->ext4-uuid
             string->btrfs-uuid
+            string->fat32-uuid
             iso9660-uuid->string
 
             ;; XXX: For lack of a better place.
@@ -175,6 +176,22 @@ (define (fat32-uuid->string uuid)
         (low (bytevector-uint-ref uuid 2 %fat32-endianness 2)))
     (format #f "~:@(~x-~x~)" low high)))
 
+(define %fat32-uuid-rx
+  (make-regexp "^([[:xdigit:]]{4})-([[:xdigit:]]{4})$"))
+
+(define (string->fat32-uuid str)
+  "Parse STR, which is in FAT32 format, and return a bytevector or #f."
+  (match (regexp-exec %fat32-uuid-rx str)
+    (#f
+     #f)
+    (rx-match
+     (uint-list->bytevector (list (string->number
+                                   (match:substring rx-match 2) 16)
+                                  (string->number
+                                   (match:substring rx-match 1) 16))
+                            %fat32-endianness
+                            2))))
+
 
 ;;;
 ;;; Generic interface.
@@ -198,6 +215,7 @@ (define-syntax vhashq
 (define %uuid-parsers
   (vhashq
    ('dce 'ext2 'ext3 'ext4 'btrfs 'luks => string->dce-uuid)
+   ('fat32 'fat => string->fat32-uuid)
    ('iso9660 => string->iso9660-uuid)))
 
 (define %uuid-printers
diff --git a/tests/uuid.scm b/tests/uuid.scm
index c2f15de996..aacce77233 100644
--- a/tests/uuid.scm
+++ b/tests/uuid.scm
@@ -53,4 +53,8 @@ (define-module (test-uuid)
   "1970-01-01-17-14-42-99"
   (uuid->string (uuid "1970-01-01-17-14-42-99" 'iso9660)))
 
+(test-equal "uuid, FAT32, format preserved"
+  "1234-ABCD"
+  (uuid->string (uuid "1234-abcd" 'fat32)))
+
 (test-end)
-- 
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