SecCFWrappers.c   [plain text]

/*
 * Copyright (c) 2012,2014 Apple Inc. All Rights Reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */


#include <utilities/SecCFWrappers.h>

//
// Global sigleton Zulu time. Must be serialized since it is really a CFMutableCalendarRef
//  <rdar://problem/16372688> CFCalendarDecomposeAbsoluteTime is not thread safe
//
static dispatch_queue_t fqueue_cf;
static CFCalendarRef sZuluCalendar = NULL;

static dispatch_queue_t SecCFCalendarGetZuluQueue() {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        fqueue_cf = dispatch_queue_create("ZuluCalendar", DISPATCH_QUEUE_SERIAL);
    });
    return fqueue_cf;
}

static CFCalendarRef SecCFCalendarGetZulu() {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sZuluCalendar = CFCalendarCreateWithIdentifier(kCFAllocatorDefault, kCFGregorianCalendar);
        CFTimeZoneRef tz = CFTimeZoneCreateWithTimeIntervalFromGMT(kCFAllocatorDefault, 0.0);
        CFCalendarSetTimeZone(sZuluCalendar, tz);
        if (tz)
            CFRelease(tz);
    });
    return sZuluCalendar;
}

void SecCFCalendarDoWithZuluCalendar(void(^action)(CFCalendarRef zuluCalendar)) {
    dispatch_sync(SecCFCalendarGetZuluQueue(), ^{
        action(SecCFCalendarGetZulu());
    });
}

void CFStringPerformWithCStringAndLength(CFStringRef inStr, void(^operation)(const char *utf8String, size_t utf8Length)) {
    const char *cstr = CFStringGetCStringPtr(inStr, kCFStringEncodingUTF8);
    if (cstr) {
        operation(cstr, strlen(cstr));
    } else {
        CFIndex neededLen = 0;
        CFRange range = { 0, CFStringGetLength(inStr) };
        CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                         0, FALSE, NULL, 0, &neededLen);
        CFIndex usedLen = 0;
        if (neededLen < 4096) {
            char buf[neededLen + 1];
            CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                             0, FALSE, (UInt8 *)buf, neededLen, &usedLen);
            assert(usedLen == neededLen);
            buf[usedLen] = 0;
            operation(buf, (size_t)usedLen);
            //cc_zero(neededLen, buf);
        } else {
            char *buf = malloc(neededLen + 1);
            CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                             0, FALSE, (UInt8 *)buf, neededLen, &usedLen);
            assert(usedLen == neededLen);
            buf[usedLen] = 0;
            operation(buf, (size_t)usedLen);
            //cc_zero(neededLen, buf);
            free(buf);
        }
    }
}

void CFStringPerformWithCString(CFStringRef inStr, void(^operation)(const char *utf8String)) {
    const char *cstr = CFStringGetCStringPtr(inStr, kCFStringEncodingUTF8);
    if (cstr) {
        operation(cstr);
    } else {
        CFIndex neededLen = 0;
        CFRange range = { 0, CFStringGetLength(inStr) };
        CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                         0, FALSE, NULL, 0, &neededLen);
        CFIndex usedLen = 0;
        if (neededLen < 4096) {
            char buf[neededLen + 1];
            CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                             0, FALSE, (UInt8 *)buf, neededLen, &usedLen);
            assert(usedLen == neededLen);
            buf[usedLen] = 0;
            operation(buf);
            //cc_zero(neededLen, buf);
        } else {
            char *buf = malloc(neededLen + 1);
            CFStringGetBytes(inStr, range, kCFStringEncodingUTF8,
                             0, FALSE, (UInt8 *)buf, neededLen, &usedLen);
            assert(usedLen == neededLen);
            buf[usedLen] = 0;
            operation(buf);
            //cc_zero(neededLen, buf);
            free(buf);
        }
    }
}