DOM string changes. All nsString& in DOM interfaces (and interfaces needed by DOM implementations) have been changed to nsAReadableString& and nsAWritableString&. String implementation additions (sanctioned by scc) to support DOM needs. Bug 49091. r=vidur,jst,scc

git-svn-id: svn://10.0.0.236/trunk@76967 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/xpcom/string/src/nsReadableUtils.cpp

@@ -25,6 +25,7 @@
 
 #include "nsReadableUtils.h"
 #include "nsMemory.h"
+#include "nsString.h"
 
 
 
@@ -65,6 +66,24 @@ class LossyConvertEncoding
   };
 
 
+NS_COM
+void
+CopyUCS2toASCII( const nsAReadableString& aSource, nsAWritableCString& aDest )
+  {
+      // right now, this won't work on multi-fragment destinations
+    aDest.SetLength(aSource.Length());
+    copy_string(aSource.BeginReading(), aSource.EndReading(), LossyConvertEncoding<PRUnichar, char>(aDest.BeginWriting().get()));
+  }
+
+NS_COM
+void
+CopyASCIItoUCS2( const nsAReadableCString& aSource, nsAWritableString& aDest )
+  {
+      // right now, this won't work on multi-fragment destinations
+    aDest.SetLength(aSource.Length());
+    copy_string(aSource.BeginReading(), aSource.EndReading(), LossyConvertEncoding<char, PRUnichar>(aDest.BeginWriting().get()));
+  }
+
 
   /**
    * A helper function that allocates a buffer of the desired character type big enough to hold a copy of the supplied string (plus a zero terminator).
@@ -91,6 +110,30 @@ ToNewCString( const nsAReadableString& aSource )
     return result;
   }
 
+NS_COM
+char*
+ToNewUTF8String( const nsAReadableString& aSource )
+  {
+    NS_ConvertUCS2toUTF8 temp(aSource);
+
+    char* result;
+    if (temp.mOwnsBuffer) {
+      // We allocated. Trick the string into not freeing its buffer to
+      // avoid an extra allocation.
+      result = temp.mStr;
+
+      temp.mStr=0;
+      temp.mOwnsBuffer = PR_FALSE;
+    }
+    else {
+      // We didn't allocate a buffer, so we need to copy it out of the
+      // nsCAutoString's storage.
+      result = nsCRT::strdup(temp.mStr);
+    }
+
+    return result;
+  }
+
 NS_COM
 char*
 ToNewCString( const nsAReadableCString& aSource )
@@ -122,6 +165,21 @@ ToNewUnicode( const nsAReadableCString& aSource )
     return result;
   }
 
+NS_COM
+PRUnichar*
+CopyUnicodeTo( const nsAReadableString& aSource,
+               PRUnichar* aDest,
+               PRUint32 aLength )
+  {
+    typedef nsAReadableString::const_iterator iterator;
+
+    iterator done_reading = aSource.BeginReading();
+    done_reading += aLength;
+
+    copy_string(aSource.BeginReading(), done_reading, aDest);
+    return aDest;
+  }
+
 NS_COM
 PRBool
 IsASCII( const nsAReadableString& aString )