Source/JavaScriptCore/API/JSStringRefCF.cpp

/*
 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#include "config.h"
#include "JSStringRefCF.h"

#include "APICast.h"
#include "InitializeThreading.h"
#include "JSCJSValue.h"
#include "JSStringRef.h"
#include "OpaqueJSString.h"
#include <wtf/StdLibExtras.h>

JSStringRef JSStringCreateWithCFString(CFStringRef string)
{
    JSC::initializeThreading();

    // We cannot use CFIndex here since CFStringGetLength can return values larger than
    // it can hold.  (<rdar://problem/6806478>)
    size_t length = CFStringGetLength(string);
    if (!length)
        return &OpaqueJSString::create(reinterpret_cast<const LChar*>(""), 0).leakRef();

    Vector<LChar, 1024> lcharBuffer(length);
    CFIndex usedBufferLength;
    CFIndex convertedSize = CFStringGetBytes(string, CFRangeMake(0, length), kCFStringEncodingISOLatin1, 0, false, lcharBuffer.data(), length, &usedBufferLength);
    if (static_cast<size_t>(convertedSize) == length && static_cast<size_t>(usedBufferLength) == length)
        return &OpaqueJSString::create(lcharBuffer.data(), length).leakRef();

    auto buffer = std::make_unique<UniChar[]>(length);
    CFStringGetCharacters(string, CFRangeMake(0, length), buffer.get());
    static_assert(sizeof(UniChar) == sizeof(UChar), "UniChar and UChar must be same size");
    return &OpaqueJSString::create(reinterpret_cast<UChar*>(buffer.get()), length).leakRef();
}

CFStringRef JSStringCopyCFString(CFAllocatorRef allocator, JSStringRef string)
{
    if (!string || !string->length())
        return CFSTR("");

    if (string->is8Bit())
        return CFStringCreateWithBytes(allocator, reinterpret_cast<const UInt8*>(string->characters8()), string->length(), kCFStringEncodingISOLatin1, false);

    return CFStringCreateWithCharacters(allocator, reinterpret_cast<const UniChar*>(string->characters16()), string->length());
}