Security-57336.1.9.tar.gz

[apple/security.git] / OSX / sec / ProjectHeaders / Security / SecureObjectSync / SOSGenCount.c

diff --git a/OSX/sec/ProjectHeaders/Security/SecureObjectSync/SOSGenCount.c b/OSX/sec/ProjectHeaders/Security/SecureObjectSync/SOSGenCount.c
new file mode 100644 (file)
index 0000000..835fea9
--- /dev/null
+++ b/OSX/sec/ProjectHeaders/Security/SecureObjectSync/SOSGenCount.c
@@ -0,0 +1,86 @@
+//
+//  SOSGenCount.c
+//  sec
+//
+//  Created by Richard Murphy on 1/29/15.
+//
+//
+
+#include "SOSGenCount.h"
+#include <utilities/SecCFWrappers.h>
+#include <CoreFoundation/CFLocale.h>
+
+static CFAbsoluteTime SOSGenerationCountGetDateBits(int64_t genValue) {
+    return (uint32_t) ((((uint64_t) genValue) >> 32) << 1);
+}
+
+void SOSGenerationCountWithDescription(SOSGenCountRef gen, void (^operation)(CFStringRef description)) {
+    CFStringRef description = SOSGenerationCountCopyDescription(gen);
+
+    operation(description);
+
+    CFReleaseSafe(description);
+}
+
+CFStringRef SOSGenerationCountCopyDescription(SOSGenCountRef gen) {
+    int64_t value = SOSGetGenerationSint(gen);
+
+    CFMutableStringRef gcDecsription = CFStringCreateMutableCopy(kCFAllocatorDefault, 0, CFSTR("["));
+
+    withStringOfAbsoluteTime(SOSGenerationCountGetDateBits(value), ^(CFStringRef decription) {
+        CFStringAppend(gcDecsription, decription);
+    });
+
+    CFStringAppendFormat(gcDecsription, NULL, CFSTR(" %u]"), (uint32_t)(value & 0xFFFFFFFF));
+
+    return gcDecsription;
+}
+
+int64_t SOSGetGenerationSint(SOSGenCountRef gen) {
+    int64_t value;
+    if(!gen) return 0;
+    CFNumberGetValue(gen, kCFNumberSInt64Type, &value);
+    return value;
+}
+
+static int64_t sosGenerationSetHighBits(int64_t value, int32_t high_31)
+{
+    value &= 0xFFFFFFFF; // Keep the low 32 bits.
+    value |= ((int64_t) high_31) << 32;
+
+    return value;
+}
+
+static SOSGenCountRef sosGenerationCreateOrIncrement(SOSGenCountRef gen) {
+    int64_t value = 0;
+
+    if(gen) {
+        value = SOSGetGenerationSint(gen);
+    }
+
+    if((value >> 32) == 0) {
+        uint32_t seconds = CFAbsoluteTimeGetCurrent(); // seconds
+        value = sosGenerationSetHighBits(value, (seconds >> 1));
+    }
+
+    value++;
+    return CFNumberCreate(NULL, kCFNumberSInt64Type, &value);
+}
+
+SOSGenCountRef SOSGenerationCreate() {
+    return sosGenerationCreateOrIncrement(NULL);
+}
+
+SOSGenCountRef SOSGenerationIncrementAndCreate(SOSGenCountRef gen) {
+    return sosGenerationCreateOrIncrement(gen);
+}
+
+SOSGenCountRef SOSGenerationCopy(SOSGenCountRef gen) {
+    if(!gen) return NULL;
+    int64_t value = SOSGetGenerationSint(gen);
+    return CFNumberCreate(NULL, kCFNumberSInt64Type, &value);
+}
+
+bool SOSGenerationIsOlder(SOSGenCountRef current, SOSGenCountRef proposed) {
+    return CFNumberCompare(current, proposed, NULL) == kCFCompareGreaterThan;
+}