/*

 * 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 COMPUTER, 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 COMPUTER, 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

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "JSStringRef.h"

#include "InitializeThreading.h"

#include "OpaqueJSString.h"

#include <wtf/unicode/UTF8.h>

using namespace JSC;

using namespace WTF::Unicode;

JSStringRef JSStringCreateWithCharacters(const JSChar* chars, size_t numChars)

{

    initializeThreading();

    return OpaqueJSString::create(chars, numChars).releaseRef();

}

JSStringRef JSStringCreateWithUTF8CString(const char* string)

{

    initializeThreading();

    if (string) {

        size_t length = strlen(string);

        Vector<UChar, 1024> buffer(length);

        UChar* p = buffer.data();

        if (conversionOK == convertUTF8ToUTF16(&string, string + length, &p, p + length))

            return OpaqueJSString::create(buffer.data(), p - buffer.data()).releaseRef();

    }

    // Null string.

    return OpaqueJSString::create().releaseRef();

}

JSStringRef JSStringRetain(JSStringRef string)

{

    string->ref();

    return string;

}

void JSStringRelease(JSStringRef string)

{

    string->deref();

}

size_t JSStringGetLength(JSStringRef string)

{

    return string->length();

}

const JSChar* JSStringGetCharactersPtr(JSStringRef string)

{

    return string->characters();

}

size_t JSStringGetMaximumUTF8CStringSize(JSStringRef string)

{

    // Any UTF8 character > 3 bytes encodes as a UTF16 surrogate pair.

    return string->length() * 3 + 1; // + 1 for terminating '\0'

}

size_t JSStringGetUTF8CString(JSStringRef string, char* buffer, size_t bufferSize)

{

    if (!bufferSize)

        return 0;

    char* p = buffer;

    const UChar* d = string->characters();

    ConversionResult result = convertUTF16ToUTF8(&d, d + string->length(), &p, p + bufferSize - 1, true);

    *p++ = '\0';

    if (result != conversionOK && result != targetExhausted)

        return 0;

    return p - buffer;

}

bool JSStringIsEqual(JSStringRef a, JSStringRef b)

{

    unsigned len = a->length();

    return len == b->length() && 0 == memcmp(a->characters(), b->characters(), len * sizeof(UChar));

}

bool JSStringIsEqualToUTF8CString(JSStringRef a, const char* b)

{

    JSStringRef bBuf = JSStringCreateWithUTF8CString(b);

    bool result = JSStringIsEqual(a, bBuf);

    JSStringRelease(bBuf);

    return result;

}