#include "rar.hpp"
 
 EncodeFileName::EncodeFileName()
 {
   Flags=0;
   FlagBits=0;
   FlagsPos=0;
   DestSize=0;
 }
 
 
 
 
 void EncodeFileName::Decode(char *Name,size_t NameSize,byte *EncName,size_t EncSize,
                             wchar *NameW,size_t MaxDecSize)
 {
   size_t EncPos=0,DecPos=0;
   byte HighByte=EncPos<EncSize ? EncName[EncPos++] : 0;
   while (EncPos<EncSize && DecPos<MaxDecSize)
   {
     if (FlagBits==0)
     {
       if (EncPos>=EncSize)
         break;
       Flags=EncName[EncPos++];
       FlagBits=8;
     }
     switch(Flags>>6)
     {
       case 0:
         if (EncPos>=EncSize)
           break;
         NameW[DecPos++]=EncName[EncPos++];
         break;
       case 1:
         if (EncPos>=EncSize)
           break;
         NameW[DecPos++]=EncName[EncPos++]+(HighByte<<8);
         break;
       case 2:
         if (EncPos+1>=EncSize)
           break;
         NameW[DecPos++]=EncName[EncPos]+(EncName[EncPos+1]<<8);
         EncPos+=2;
         break;
       case 3:
         {
           if (EncPos>=EncSize)
             break;
           int Length=EncName[EncPos++];
           if ((Length & 0x80)!=0)
           {
             if (EncPos>=EncSize)
               break;
             byte Correction=EncName[EncPos++];
             for (Length=(Length&0x7f)+2;Length>0 && DecPos<MaxDecSize && DecPos<NameSize;Length--,DecPos++)
               NameW[DecPos]=((Name[DecPos]+Correction)&0xff)+(HighByte<<8);
           }
           else
             for (Length+=2;Length>0 && DecPos<MaxDecSize && DecPos<NameSize;Length--,DecPos++)
               NameW[DecPos]=Name[DecPos];
         }
         break;
     }
     Flags<<=2;
     FlagBits-=2;
   }
   NameW[DecPos<MaxDecSize ? DecPos:MaxDecSize-1]=0;
 }