[WCX] Add new API-functions for faster file extraction

[remittor]

Now TotalCmd fully reads internal archive cache for extraction one file. And it is not very efficient.

It is necessary to make the WCX-plugin immediately understand which file is asked to unpack it.

Code: Select all

#pragma pack(push, 1)

const int AdditionalDataSize = 64;

struct TArcElemInfo {
  UINT64   PackSize;           /* Packed file size */
  UINT64   UnpSize;            /* Unpacked file size */
  int      FileAttr;           
  FILETIME CreationTime;       /* birthtime, Win32 format, GMT+0 */
  FILETIME LastWriteTime;      /* mtime, Win32 format, GMT+0 */
  FILETIME LastAccessTime;     /* atime, Win32 format, GMT+0 */
  BYTE     AdditionalData[AdditionalDataSize];
};

struct TArchiveElem {
  TArcElemInfo ElemInfo;
  WCHAR        FileName[5000]; /* like as Unix filename limit */
};

#pragma pack(pop)

Code: Select all

/* Function GetArchiveElemW should be called instead ReadHeaderExW. */
int __stdcall GetArchiveElemW (HANDLE hArcData, TArchiveElem * elem);


/* Function ExtractElemW should be called instead ProcessFile. */
/* Flag PK_SKIP not needed, because */
/* WCX-plugin should find the element in the archive by AdditionalData info. */
int __stdcall ExtractElemW (HANDLE hArcData, int Operation, const WCHAR * DestName, const TArcElemInfo * ElemInfo);

See also: https://www.ghisler.ch/board/viewtopic.php?f=14&t=54681&p=362431#p362431

[ghisler(Author)]

TC currently uses functions similar to the UnRAR DLL, which are optimized for archives supporting solid archives which need to be accessed linearly from start to end.

[remittor]

TC currently uses functions similar to the UnRAR DLL, which are optimized for archives supporting solid archives which need to be accessed linearly from start to end.

So I did not ask to remove the current functionality. I ask for expanded functionality.

RAR support solid mode as additional option!