intl/uconv/src/nsCharsetAliasImp.cpp

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  37
  38
  39 #include "nsICharsetAlias.h"
  40 #include "pratom.h"
  41
  42 // for NS_IMPL_IDS only
  43 #include "nsIPlatformCharset.h"
  44
  45 #include "nsUConvDll.h"
  46 #include "nsReadableUtils.h"
  47 #include "nsUnicharUtils.h"
  48 #include "nsGREResProperties.h"
  49 #include "nsITimelineService.h"
  50 #include "nsCharsetAlias.h"
  51
  52 //--------------------------------------------------------------
  53 NS_IMPL_ISUPPORTS1(nsCharsetAlias2, nsICharsetAlias)
  54
  55 //--------------------------------------------------------------
  56 nsCharsetAlias2::nsCharsetAlias2()
  57 {
  58   mDelegate = nsnull; // delay the load of mDelegate untill we need it.
  59 }
  60 //--------------------------------------------------------------
  61 nsCharsetAlias2::~nsCharsetAlias2()
  62 {
  63   if(mDelegate)
  64      delete mDelegate;
  65 }
  66
  67 //
  68 static const char* kAliases[][3] = {
  69   // Triple with { lower-case test string, out string, length of out string }
  70   { "iso-8859-1", "ISO-8859-1", (const char*)NS_INT32_TO_PTR(10) },
  71   { "utf-8",      "UTF-8",      (const char*)NS_INT32_TO_PTR(5)  },
  72   { "x-sjis",     "Shift_JIS",  (const char*)NS_INT32_TO_PTR(9)  },
  73   { "shift_jis",  "Shift_JIS",  (const char*)NS_INT32_TO_PTR(9)  }
  74 };
  75
  76 //--------------------------------------------------------------
  77 NS_IMETHODIMP nsCharsetAlias2::GetPreferred(const nsACString& aAlias,
  78                                             nsACString& oResult)
  79 {
  80    if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;
  81    NS_TIMELINE_START_TIMER("nsCharsetAlias2:GetPreferred");
  82
  83
  84    // Delay loading charsetalias.properties by hardcoding the most
  85    // frequent aliases.  Note that it's possible to recur in to this
  86    // function *while loading* charsetalias.properties (see bug 190951),
  87    // so we might have an |mDelegate| already that isn't valid yet, but
  88    // the load is guaranteed to be "UTF-8" so things will be OK.
  89    for (PRUint32 index = 0; index < NS_ARRAY_LENGTH(kAliases); index++) {
  90      if (aAlias.LowerCaseEqualsASCII(kAliases[index][0])) {
  91        oResult.Assign(nsDependentCString(kAliases[index][1],
  92                                          NS_PTR_TO_UINT32(kAliases[index][2])));
  93        NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
  94        return NS_OK;
  95      }
  96    }
  97
  98    oResult.Truncate();
  99
 100    if(!mDelegate) {
 101      //load charsetalias.properties string bundle with all remaining aliases
 102      // we may need to protect the following section with a lock so we won't call the
 103      // 'new nsGREResProperties' from two different threads
 104      mDelegate = new nsGREResProperties( NS_LITERAL_CSTRING("charsetalias.properties") );
 105      NS_ASSERTION(mDelegate, "cannot create nsGREResProperties");
 106      if(nsnull == mDelegate)
 107        return NS_ERROR_OUT_OF_MEMORY;
 108    }
 109
 110    NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
 111    NS_TIMELINE_MARK_TIMER("nsCharsetAlias2:GetPreferred");
 112
 113    nsCAutoString key(aAlias);
 114    ToLowerCase(key);
 115
 116    // hack for now, have to fix nsGREResProperties, but we can't until
 117    // string bundles use UTF8 keys
 118    nsAutoString result;
 119    nsresult rv = mDelegate->Get(NS_ConvertASCIItoUTF16(key), result);
 120    LossyAppendUTF16toASCII(result, oResult);
 121    return rv;
 122 }
 123
 124 //--------------------------------------------------------------
 125 NS_IMETHODIMP
 126 nsCharsetAlias2::Equals(const nsACString& aCharset1,
 127                         const nsACString& aCharset2, PRBool* oResult)
 128 {
 129    nsresult res = NS_OK;
 130
 131    if(aCharset1.Equals(aCharset2, nsCaseInsensitiveCStringComparator())) {
 132       *oResult = PR_TRUE;
 133       return res;
 134    }
 135
 136    if(aCharset1.IsEmpty() || aCharset2.IsEmpty()) {
 137       *oResult = PR_FALSE;
 138       return res;
 139    }
 140
 141    *oResult = PR_FALSE;
 142    nsCAutoString name1;
 143    nsCAutoString name2;
 144    res = this->GetPreferred(aCharset1, name1);
 145    if(NS_SUCCEEDED(res)) {
 146       res = this->GetPreferred(aCharset2, name2);
 147       if(NS_SUCCEEDED(res)) {
 148         *oResult = name1.Equals(name2, nsCaseInsensitiveCStringComparator());
 149       }
 150    }
 151
 152    return res;
 153 }
 154