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 COMPUTER, 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 COMPUTER, 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 "JSStringRef.h"

    28 

    29 #include "InitializeThreading.h"

    30 #include "OpaqueJSString.h"

    31 #include <wtf/unicode/UTF8.h>

    32 

    33 using namespace JSC;

    34 using namespace WTF::Unicode;

    35 

    36 JSStringRef JSStringCreateWithCharacters(const JSChar* chars, size_t numChars)

    37 {

    38     initializeThreading();

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

    40 }

    41 

    42 JSStringRef JSStringCreateWithUTF8CString(const char* string)

    43 {

    44     initializeThreading();

    45     if (string) {

    46         size_t length = strlen(string);

    47         Vector<UChar, 1024> buffer(length);

    48         UChar* p = buffer.data();

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

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

    51     }

    52 

    53     // Null string.

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

    55 }

    56 

    57 JSStringRef JSStringRetain(JSStringRef string)

    58 {

    59     string->ref();

    60     return string;

    61 }

    62 

    63 void JSStringRelease(JSStringRef string)

    64 {

    65     string->deref();

    66 }

    67 

    68 size_t JSStringGetLength(JSStringRef string)

    69 {

    70     return string->length();

    71 }

    72 

    73 const JSChar* JSStringGetCharactersPtr(JSStringRef string)

    74 {

    75     return string->characters();

    76 }

    77 

    78 size_t JSStringGetMaximumUTF8CStringSize(JSStringRef string)

    79 {

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

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

    82 }

    83 

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

    85 {

    86     if (!bufferSize)

    87         return 0;

    88 

    89     char* p = buffer;

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

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

    92     *p++ = '\0';

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

    94         return 0;

    95 

    96     return p - buffer;

    97 }

    98 

    99 bool JSStringIsEqual(JSStringRef a, JSStringRef b)

   100 {

   101     unsigned len = a->length();

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

   103 }

   104 

   105 bool JSStringIsEqualToUTF8CString(JSStringRef a, const char* b)

   106 {

   107     JSStringRef bBuf = JSStringCreateWithUTF8CString(b);

   108     bool result = JSStringIsEqual(a, bBuf);

   109     JSStringRelease(bBuf);

   110     

   111     return result;

   112 }