docs/system: clarify limits of using gdbstub in system emulation

[qmiga/qemu.git] / util / uuid.c

diff --git a/util/uuid.c b/util/uuid.c
index 4701903..234619d 100644 (file)
--- a/util/uuid.c
+++ b/util/uuid.c
@@ -14,7 +14,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "qemu-common.h"
 #include "qemu/uuid.h"
 #include "qemu/bswap.h"
 
@@ -41,13 +40,18 @@ void qemu_uuid_generate(QemuUUID *uuid)
 int qemu_uuid_is_null(const QemuUUID *uu)
 {
     static QemuUUID null_uuid;
-    return memcmp(uu, &null_uuid, sizeof(QemuUUID)) == 0;
+    return qemu_uuid_is_equal(uu, &null_uuid);
+}
+
+int qemu_uuid_is_equal(const QemuUUID *lhv, const QemuUUID *rhv)
+{
+    return memcmp(lhv, rhv, sizeof(QemuUUID)) == 0;
 }
 
 void qemu_uuid_unparse(const QemuUUID *uuid, char *out)
 {
     const unsigned char *uu = &uuid->data[0];
-    snprintf(out, UUID_FMT_LEN + 1, UUID_FMT,
+    snprintf(out, UUID_STR_LEN, UUID_FMT,
              uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
              uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 }
@@ -61,12 +65,34 @@ char *qemu_uuid_unparse_strdup(const QemuUUID *uuid)
                            uu[13], uu[14], uu[15]);
 }
 
+static bool qemu_uuid_is_valid(const char *str)
+{
+    int i;
+
+    for (i = 0; i < strlen(str); i++) {
+        const char c = str[i];
+        if (i == 8 || i == 13 || i == 18 || i == 23) {
+            if (str[i] != '-') {
+                return false;
+            }
+        } else {
+            if ((c >= '0' && c <= '9') ||
+                (c >= 'A' && c <= 'F') ||
+                (c >= 'a' && c <= 'f')) {
+                continue;
+            }
+            return false;
+        }
+    }
+    return i == 36;
+}
+
 int qemu_uuid_parse(const char *str, QemuUUID *uuid)
 {
     unsigned char *uu = &uuid->data[0];
     int ret;
 
-    if (strlen(str) != 36) {
+    if (!qemu_uuid_is_valid(str)) {
         return -1;
     }
 
@@ -83,10 +109,24 @@ int qemu_uuid_parse(const char *str, QemuUUID *uuid)
 
 /* Swap from UUID format endian (BE) to the opposite or vice versa.
  */
-void qemu_uuid_bswap(QemuUUID *uuid)
+QemuUUID qemu_uuid_bswap(QemuUUID uuid)
+{
+    bswap32s(&uuid.fields.time_low);
+    bswap16s(&uuid.fields.time_mid);
+    bswap16s(&uuid.fields.time_high_and_version);
+    return uuid;
+}
+
+/* djb2 hash algorithm */
+uint32_t qemu_uuid_hash(const void *uuid)
 {
-    assert(QEMU_PTR_IS_ALIGNED(uuid, sizeof(uint32_t)));
-    bswap32s(&uuid->fields.time_low);
-    bswap16s(&uuid->fields.time_mid);
-    bswap16s(&uuid->fields.time_high_and_version);
+    QemuUUID *qid = (QemuUUID *) uuid;
+    uint32_t h = 5381;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(qid->data); i++) {
+        h = (h << 5) + h + qid->data[i];
+    }
+
+    return h;
 }