Changeset 11413 in vbox for trunk/src/VBox/Runtime/generic

Timestamp:

Aug 14, 2008 8:03:03 AM (17 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

34729

Message:

Runtime: small fix to the UUID code, splitting the ClockSeq field and put the UUID variant in the right place. Rest is cleanup and documenting that the IPRT UUIDs are little endian.

Location:

trunk/src/VBox/Runtime/generic

Files:

• RTUuidCreate-generic.cpp (modified) (2 diffs)
• uuid-generic.cpp (modified) (4 diffs)

trunk/src/VBox/Runtime/generic/RTUuidCreate-generic.cpp

@@ -39 +39 @@
 
 
-/* WARNING: This implementation ASSUMES little endian. Needs testing on big endian! */
+/* WARNING: This implementation ASSUMES little endian. Does not work on big endian! */
+
+/* Remember, the time fields in the UUID must be little endian. */
 
 
@@ -48 +50 @@
 
     RTRandBytes(pUuid, sizeof(*pUuid));
-    pUuid->Gen.u16ClockSeq = (pUuid->Gen.u16ClockSeq & 0x3fff) | 0x8000;
+    pUuid->Gen.u8ClockSeqHiAndReserved = (pUuid->Gen.u8ClockSeqHiAndReserved & 0x3f) | 0x80;
     pUuid->Gen.u16TimeHiAndVersion = (pUuid->Gen.u16TimeHiAndVersion & 0x0fff) | 0x4000;
 

trunk/src/VBox/Runtime/generic/uuid-generic.cpp

@@ -38 +38 @@
 
 
-/* WARNING: This implementation ASSUMES little endian. Needs testing on big endian! */
+/* WARNING: This implementation ASSUMES little endian. Does not work on big endian! */
+
+/* Remember, the time fields in the UUID must be little endian. */
 
 
@@ -81 +83 @@
     if (pUuid1->Gen.u16TimeHiAndVersion != pUuid2->Gen.u16TimeHiAndVersion)
         return pUuid1->Gen.u16TimeHiAndVersion < pUuid2->Gen.u16TimeHiAndVersion ? -1 : 1;
-    if (pUuid1->Gen.u16ClockSeq != pUuid2->Gen.u16ClockSeq)
-        return pUuid1->Gen.u16ClockSeq < pUuid2->Gen.u16ClockSeq ? -1 : 1;
+    if (pUuid1->Gen.u8ClockSeqHiAndReserved != pUuid2->Gen.u8ClockSeqHiAndReserved)
+        return pUuid1->Gen.u8ClockSeqHiAndReserved < pUuid2->Gen.u8ClockSeqHiAndReserved ? -1 : 1;
+    if (pUuid1->Gen.u8ClockSeqLow != pUuid2->Gen.u8ClockSeqLow)
+        return pUuid1->Gen.u8ClockSeqLow < pUuid2->Gen.u8ClockSeqLow ? -1 : 1;
     if (pUuid1->Gen.au8Node[0] != pUuid2->Gen.au8Node[0])
         return pUuid1->Gen.au8Node[0] < pUuid2->Gen.au8Node[0] ? -1 : 1;
@@ -160 +164 @@
     pszString[17] = s_achDigits[(u/*>>0*/)& 0xf];
     pszString[18] = '-';
-    u = pUuid->Gen.u16ClockSeq;
-    pszString[19] = s_achDigits[(u >>  4) & 0xf];
-    pszString[20] = s_achDigits[(u/*>>0*/)& 0xf];
-    pszString[21] = s_achDigits[(u >> 12)/*& 0xf*/];
-    pszString[22] = s_achDigits[(u >>  8) & 0xf];
+    pszString[19] = s_achDigits[pUuid->Gen.u8ClockSeqHiAndReserved >> 4];
+    pszString[20] = s_achDigits[pUuid->Gen.u8ClockSeqHiAndReserved & 0xf];
+    pszString[21] = s_achDigits[pUuid->Gen.u8ClockSeqLow >> 4];
+    pszString[22] = s_achDigits[pUuid->Gen.u8ClockSeqLow & 0xf];
     pszString[23] = '-';
     pszString[24] = s_achDigits[pUuid->Gen.au8Node[0] >> 4];
@@ -276 +279 @@
                           | (uint16_t)MY_TONUM(pszString[16]) << 4
                           | (uint16_t)MY_TONUM(pszString[17]);
-    pUuid->Gen.u16ClockSeq =(uint16_t)MY_TONUM(pszString[19]) << 4
-                          | (uint16_t)MY_TONUM(pszString[20])
-                          | (uint16_t)MY_TONUM(pszString[21]) << 12
-                          | (uint16_t)MY_TONUM(pszString[22]) << 8;
+    pUuid->Gen.u8ClockSeqHiAndReserved =
+                            (uint16_t)MY_TONUM(pszString[19]) << 4
+                          | (uint16_t)MY_TONUM(pszString[20]);
+    pUuid->Gen.u8ClockSeqLow =
+                            (uint16_t)MY_TONUM(pszString[21]) << 4
+                          | (uint16_t)MY_TONUM(pszString[22]);
     pUuid->Gen.au8Node[0] = (uint8_t)MY_TONUM(pszString[24]) << 4
                           | (uint8_t)MY_TONUM(pszString[25]);