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