intl/uconv/src/nsCharsetAliasImp.cpp
author John Schoenick <john@pointysoftware.net>
Fri, 27 Jan 2012 23:00:07 -0800
branchGECKO19226_2012012406_RELBRANCH
changeset 35256 2202afecc4e760fc12ca07a588e206793aa4bc2c
parent 10958 4b79f281112310fc6821922ce9ecd41269d8ec4a
permissions -rw-r--r--
bug702466 - Validate stack usage in xslt compiler r=sicking, a=dveditz

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The Original Code is Mozilla Communicator client code.
 *
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#include "nsICharsetAlias.h"
#include "pratom.h"

// for NS_IMPL_IDS only
#include "nsIPlatformCharset.h"

#include "nsUConvDll.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsGREResProperties.h"
#include "nsITimelineService.h"
#include "nsCharsetAlias.h"

//--------------------------------------------------------------
NS_IMPL_ISUPPORTS1(nsCharsetAlias2, nsICharsetAlias)

//--------------------------------------------------------------
nsCharsetAlias2::nsCharsetAlias2()
{
  mDelegate = nsnull; // delay the load of mDelegate untill we need it.
}
//--------------------------------------------------------------
nsCharsetAlias2::~nsCharsetAlias2()
{
  if(mDelegate)
     delete mDelegate;
}

// 
static const char* kAliases[][3] = {
  // Triple with { lower-case test string, out string, length of out string }
  { "iso-8859-1", "ISO-8859-1", (const char*)NS_INT32_TO_PTR(10) },
  { "utf-8",      "UTF-8",      (const char*)NS_INT32_TO_PTR(5)  },
  { "x-sjis",     "Shift_JIS",  (const char*)NS_INT32_TO_PTR(9)  },
  { "shift_jis",  "Shift_JIS",  (const char*)NS_INT32_TO_PTR(9)  }
};

//--------------------------------------------------------------
NS_IMETHODIMP nsCharsetAlias2::GetPreferred(const nsACString& aAlias,
                                            nsACString& oResult)
{
   if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;
   NS_TIMELINE_START_TIMER("nsCharsetAlias2:GetPreferred");


   // Delay loading charsetalias.properties by hardcoding the most
   // frequent aliases.  Note that it's possible to recur in to this
   // function *while loading* charsetalias.properties (see bug 190951),
   // so we might have an |mDelegate| already that isn't valid yet, but
   // the load is guaranteed to be "UTF-8" so things will be OK.
   for (PRUint32 index = 0; index < NS_ARRAY_LENGTH(kAliases); index++) {
     if (aAlias.LowerCaseEqualsASCII(kAliases[index][0])) {
       oResult.Assign(nsDependentCString(kAliases[index][1],
                                         NS_PTR_TO_UINT32(kAliases[index][2])));
       NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
       return NS_OK;
     }
   }

   oResult.Truncate();

   if(!mDelegate) {
     //load charsetalias.properties string bundle with all remaining aliases
     // we may need to protect the following section with a lock so we won't call the
     // 'new nsGREResProperties' from two different threads
     mDelegate = new nsGREResProperties( NS_LITERAL_CSTRING("charsetalias.properties") );
     NS_ASSERTION(mDelegate, "cannot create nsGREResProperties");
     if(nsnull == mDelegate)
       return NS_ERROR_OUT_OF_MEMORY;
   }

   NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
   NS_TIMELINE_MARK_TIMER("nsCharsetAlias2:GetPreferred");

   nsCAutoString key(aAlias);
   ToLowerCase(key);

   // hack for now, have to fix nsGREResProperties, but we can't until
   // string bundles use UTF8 keys
   nsAutoString result;
   nsresult rv = mDelegate->Get(NS_ConvertASCIItoUTF16(key), result);
   LossyAppendUTF16toASCII(result, oResult);
   return rv;
}

//--------------------------------------------------------------
NS_IMETHODIMP
nsCharsetAlias2::Equals(const nsACString& aCharset1,
                        const nsACString& aCharset2, PRBool* oResult)
{
   nsresult res = NS_OK;

   if(aCharset1.Equals(aCharset2, nsCaseInsensitiveCStringComparator())) {
      *oResult = PR_TRUE;
      return res;
   }

   if(aCharset1.IsEmpty() || aCharset2.IsEmpty()) {
      *oResult = PR_FALSE;
      return res;
   }

   *oResult = PR_FALSE;
   nsCAutoString name1;
   nsCAutoString name2;
   res = this->GetPreferred(aCharset1, name1);
   if(NS_SUCCEEDED(res)) {
      res = this->GetPreferred(aCharset2, name2);
      if(NS_SUCCEEDED(res)) {
        *oResult = name1.Equals(name2, nsCaseInsensitiveCStringComparator());
      }
   }
   
   return res;
}