API/JSStringRef.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 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 }