API/JSStringRefCF.cpp

   1 /*
   2  * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSStringRefCF.h"
  28
  29 #include "APICast.h"
  30 #include "InitializeThreading.h"
  31 #include "JSCJSValue.h"
  32 #include "JSStringRef.h"
  33 #include "OpaqueJSString.h"
  34 #include <wtf/StdLibExtras.h>
  35
  36 JSStringRef JSStringCreateWithCFString(CFStringRef string)
  37 {
  38     JSC::initializeThreading();
  39
  40     // We cannot use CFIndex here since CFStringGetLength can return values larger than
  41     // it can hold.  (<rdar://problem/6806478>)
  42     size_t length = CFStringGetLength(string);
  43     if (!length)
  44         return OpaqueJSString::create(reinterpret_cast<const LChar*>(""), 0).leakRef();
  45
  46     Vector<LChar, 1024> lcharBuffer(length);
  47     CFIndex usedBufferLength;
  48     CFIndex convertedSize = CFStringGetBytes(string, CFRangeMake(0, length), kCFStringEncodingISOLatin1, 0, false, lcharBuffer.data(), length, &usedBufferLength);
  49     if (static_cast<size_t>(convertedSize) == length && static_cast<size_t>(usedBufferLength) == length)
  50         return OpaqueJSString::create(lcharBuffer.data(), length).leakRef();
  51
  52     auto buffer = std::make_unique<UniChar[]>(length);
  53     CFStringGetCharacters(string, CFRangeMake(0, length), buffer.get());
  54     static_assert(sizeof(UniChar) == sizeof(UChar), "UniChar and UChar must be same size");
  55     return OpaqueJSString::create(reinterpret_cast<UChar*>(buffer.get()), length).leakRef();
  56 }
  57
  58 CFStringRef JSStringCopyCFString(CFAllocatorRef allocator, JSStringRef string)
  59 {
  60     if (!string->length())
  61         return CFSTR("");
  62
  63     if (string->is8Bit())
  64         return CFStringCreateWithBytes(allocator, reinterpret_cast<const UInt8*>(string->characters8()), string->length(), kCFStringEncodingISOLatin1, false);
  65
  66     return CFStringCreateWithCharacters(allocator, reinterpret_cast<const UniChar*>(string->characters16()), string->length());
  67 }