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      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 }
    113