#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; 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(); 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;
}