intrface.cpp

完整的解压zip文件的源码。包含密码功能

      // I hate to do this... Take a giant step out of here.
      longjmp(dll_error_return, PK_ABORTED);
   }
}

//******************************************************************************
void SetCurrentFile(Uz_Globs *pG) {

   // Reset all our counters as we about to process a new file.
   g_pExtractInfo->dwFileOffset = (DWORD)pG->pInfo->offset;
   g_pExtractInfo->dwFile++;
   g_pExtractInfo->dwBytesWrittenThisFile = 0;
   g_pExtractInfo->dwBytesWrittenPreviousFiles += g_pExtractInfo->dwBytesTotalThisFile;
   g_pExtractInfo->dwBytesTotalThisFile = pG->ucsize;
   g_pExtractInfo->szFile = pG->filename;
   g_pExtractInfo->fNewLineOfText = TRUE;

   // Pass control to our GUI thread to do a full update our progress dialog.
   SendMessage(g_hWndMain, WM_PRIVATE, MSG_UPDATE_PROGRESS_COMPLETE,
               (LPARAM)g_pExtractInfo);

   // Check our abort flag.
   CheckForAbort(pG);
}


//******************************************************************************
//***** Callbacks from Info-ZIP code.
//******************************************************************************

int UzpMessagePrnt2(zvoid *pG, uch *buffer, ulg size, int flag) {

   // Some ZIP files cause us to get called during DoListFiles(). We only handle
   // messages while processing DoExtractFiles().
   if (!g_pExtractInfo) {
      if (g_hWndEdit) {
         SendMessage(g_hWndMain, WM_PRIVATE, MSG_ADD_TEXT_TO_EDIT,
                     (LPARAM)buffer);
      } else {
         DebugOut(TEXT("Unhandled call to UzpMessagePrnt2(\"%S\")"), buffer);
      }
      return 0;
   }

   // When extracting, mapname() will get called for every file which in turn
   // will call SetCurrentFile().  For testing though, mapname() never gets
   // called so we need to be on the lookout for a new file.
   if (g_pExtractInfo->dwFileOffset != (DWORD)((Uz_Globs*)pG)->pInfo->offset) {
      SetCurrentFile((Uz_Globs*)pG);
   }

   // Make sure this message was inteded for us to display.
   if (!MSG_NO_WGUI(flag) && !MSG_NO_WDLL(flag)) {

      // Insert a leading newline if requested to do so.
      if (MSG_LNEWLN(flag) && !g_pExtractInfo->fNewLineOfText) {
         SendMessage(g_hWndMain, WM_PRIVATE, MSG_ADD_TEXT_TO_EDIT, (LPARAM)"\n");
         g_pExtractInfo->fNewLineOfText = TRUE;
      }

      // Since we use a proportional font, we need to do a little cleanup of the
      // text we are passed since it assumes a fixed font and adds padding to try
      // to line things up.  We remove leading whitespace on any new line of text.
      if (g_pExtractInfo->fNewLineOfText) {
         while (*buffer == ' ') {
            buffer++;
         }
      }

      // We always remove trailing whitespace.
      LPSTR psz = (LPSTR)buffer + strlen((LPSTR)buffer) - 1;
      while ((psz >= (LPSTR)buffer) && (*psz == ' ')) {
         *(psz--) = '\0';
      }

      // Determine if the next line of text will be a new line of text.
      g_pExtractInfo->fNewLineOfText = ((*psz == '\r') || (*psz == '\n'));

      // Change all forward slashes to back slashes in the buffer
      ForwardSlashesToBackSlashesA((LPSTR)buffer);

      // Add the cleaned-up text to our extraction log edit control.
      SendMessage(g_hWndMain, WM_PRIVATE, MSG_ADD_TEXT_TO_EDIT, (LPARAM)buffer);

      // Append a trailing newline if requested to do so.
      if (MSG_TNEWLN(flag) || MSG_MNEWLN(flag) && !g_pExtractInfo->fNewLineOfText) {
         SendMessage(g_hWndMain, WM_PRIVATE, MSG_ADD_TEXT_TO_EDIT, (LPARAM)"\n");
         g_pExtractInfo->fNewLineOfText = TRUE;
      }
   }

   return 0;
}

//******************************************************************************
int UzpInput2(zvoid *pG, uch *buffer, int *size, int flag) {
   DebugOut(TEXT("WARNING: UzpInput2(...) called"));
   return 0;
}

//******************************************************************************
void UzpMorePause(zvoid *pG, const char *szPrompt, int flag) {
   DebugOut(TEXT("WARNING: UzpMorePause(...) called"));
}

//******************************************************************************
int UzpPassword(zvoid *pG, int *pcRetry, char *szPassword, int nSize,
                const char *szZipFile, const char *szFile)
{
   // Return Values:
   //    IZ_PW_ENTERED    got some PWD string, use/try it
   //    IZ_PW_CANCEL     no password available (for this entry)
   //    IZ_PW_CANCELALL  no password, skip any further PWD request
   //    IZ_PW_ERROR      failure (no mem, no tty, ...)

#if CRYPT

   // Build the data structure for our dialog.
   DECRYPT_INFO di;
   di.retry      = *pcRetry;
   di.szPassword = szPassword;
   di.nSize      = nSize;
   di.szFile     = szFile;

   // Clear the password to be safe.
   *di.szPassword = '\0';

   // On our first call for a file, *pcRetry == 0.  If we would like to allow
   // for retries, then we set the value of *pcRetry to the number of retries we
   // are willing to allow.  We will be recalled as neccessary, each time with
   // *pcRetry being decremented once.  1 is the last retry we will get.
   *pcRetry = (*pcRetry == 0) ? MAX_PASSWORD_RETRIES : (*pcRetry - 1);

   // Pass control to our GUI thread which will prompt the user for a password.
   return SendMessage(g_hWndMain, WM_PRIVATE, MSG_PROMPT_FOR_PASSWORD, (LPARAM)&di);

#else
   return -2;
#endif
}

//******************************************************************************
int WINAPI UzpReplace(char *szFile) {
   // Pass control to our GUI thread which will prompt the user to overwrite.
   return SendMessage(g_hWndMain, WM_PRIVATE, MSG_PROMPT_TO_REPLACE, (LPARAM)szFile);
}

//******************************************************************************
void WINAPI UzpSound(void) {
   // Do nothing.
}

//******************************************************************************
// Called from LIST.C
void WINAPI SendAppMsg(ulg dwSize, ulg dwCompressedSize, int ratio, int month,
                       int day, int year, int hour, int minute, int uppercase,
                       char *szPath, char *szMethod, ulg dwCRC)
{
   // If we are out of memory, then just bail since we will only make things worse.
   if (g_fOutOfMemory) {
      return;
   }

   // We get our Globals structure and then retrieve the real file name.
   GETGLOBALS()
   szPath = pG->filename;

   // Allocate a FILE_NODE large enough to hold this file.
   int length = strlen(szPath) + strlen(szMethod);
   g_pFileLast = (FILE_NODE*)new BYTE[sizeof(FILE_NODE) + (sizeof(TCHAR) * length)];

   // Bail out if we failed to allocate the node.
   if (!g_pFileLast) {
      DebugOut(TEXT("Failed to create a FILE_NODE for \"%S\"."), szPath);
      g_fOutOfMemory = TRUE;
      return;
   }

   // Fill in our node.
   g_pFileLast->dwSize           = dwSize;
   g_pFileLast->dwCompressedSize = dwCompressedSize;
   g_pFileLast->dwCRC            = dwCRC;
   g_pFileLast->szComment        = NULL;
   g_pFileLast->szType           = NULL;

   // Fix the year value to contain the real year.
   year += 1900;

   // Year:   0 - 4095 (12) 1111 1111 1111 0000 0000 0000 0000 0000 (0xFFF00000)
   // Month:  1 -   12 ( 4) 0000 0000 0000 1111 0000 0000 0000 0000 (0x000F0000)
   // Day:    1 -   31 ( 5) 0000 0000 0000 0000 1111 1000 0000 0000 (0x0000F800)
   // Hour:   0 -   23 ( 5) 0000 0000 0000 0000 0000 0111 1100 0000 (0x000007C0)
   // Minute: 0 -   59 ( 6) 0000 0000 0000 0000 0000 0000 0011 1111 (0x0000003F)

   // Do some bit shifting to make the date and time fit in a DWORD.
   g_pFileLast->dwModified = (((DWORD)(year   & 0x0FFF) << 20) |
                              ((DWORD)(month  & 0x000F) << 16) |
                              ((DWORD)(day    & 0x001F) << 11) |
                              ((DWORD)(hour   & 0x001F) <<  6) |
                              ((DWORD)(minute & 0x003F)));

   // We need to get our globals structure to determine our attributes and
   // encryption information.
   g_pFileLast->dwAttributes = (pG->crec.external_file_attributes & 0xFF);
   if (pG->crec.general_purpose_bit_flag & 1) {
      g_pFileLast->dwAttributes |= FILE_ATTRIBUTE_ENCRYPTED;
   }

   // Store the path and method in our string buffer.
   strcpy(g_pFileLast->szPathAndMethod, szPath);
   strcpy(g_pFileLast->szPathAndMethod + strlen(szPath) + 1, szMethod);

   // Pass the file object to our windows code to have it added to our list.
   AddFileToListView(g_pFileLast);
}

//******************************************************************************
int win_fprintf(FILE *file, unsigned int dwCount, char far *buffer) {

   // win_fprintf() is used within Info-ZIP to write to a file as well as log
   // information.  If the "file" is a real file handle (not stdout or stderr),
   // then we write the data to the file and return.

   if ((file != stdout) && (file != stderr)) {

      DWORD dwBytesWriten = 0;
#ifdef _WIN32_WCE
      // On WinCE all FILEs are really HANDLEs.  See WINCE.CPP for more info.
      WriteFile((HANDLE)file, buffer, dwCount, &dwBytesWriten, NULL);
#else
      dwBytesWriten = fwrite(buffer, 1, dwCount, file);
#endif

      // Update our bytes written count.
      g_pExtractInfo->dwBytesWrittenThisFile += dwBytesWriten;

      // Pass control to our GUI thread to do a partial update our progress dialog.
      SendMessage(g_hWndMain, WM_PRIVATE, MSG_UPDATE_PROGRESS_PARTIAL,
                  (LPARAM)g_pExtractInfo);

      // Check our abort flag.
      GETGLOBALS();
      CheckForAbort(pG);

      return dwBytesWriten;
   }

   // Check to see if we are expecting a extraction progress string
   if (g_pExtractInfo) {

      // Most of our progress strings come to our UzpMessagePrnt2() callback,
      // but we occasionally get one here.  We will just forward it to
      // UzpMessagePrnt2() as if it never came here.  To do this, we need to
      // get a pointer to our Globals struct.  Calling GETGLOBALS() sort of
      // breaks us from be REENTRANT, but we don't support that anyway.
      GETGLOBALS();
      UzpMessagePrnt2(pG, (uch*)buffer, dwCount, 0);
      return dwCount;
   }

   // Check to see if we are expecting a zip file comment string.
   if (g_hWndEdit) {

      // Change all forward slashes to back slashes in the buffer
      ForwardSlashesToBackSlashesA((LPSTR)buffer);

      SendMessage(g_hWndMain, WM_PRIVATE, MSG_ADD_TEXT_TO_EDIT, (LPARAM)buffer);
      return dwCount;
   }

   // Check to see if we are expecting a compressed file comment string.
   if (g_pFileLast) {

      // Calcalute the size of the buffer we will need to store this comment.
      // We are going to convert all ASC values 0 - 31 (excpet tab, new line,
      // and CR) to ^char.
      int size = 1;
      for (char *p2, *p1 = buffer; *p1; p1++) {
         size += ((*p1 >= 32) || (*p1 == '\t') || (*p1 == '\r') || (*p1 == '\n')) ? 1 : 2;
      }

      // Allocate a comment buffer and assign it to the last file node we saw.
      if (g_pFileLast->szComment = new CHAR[size]) {

         // Copy while formatting.
         for (p1 = buffer, p2 = (char*)g_pFileLast->szComment; *p1; p1++) {
            if ((*p1 >= 32) || (*p1 == '\t') || (*p1 == '\r') || (*p1 == '\n')) {
               *(p2++) = *p1;
            } else {
               *(p2++) = '^';
               *(p2++) = 64 + *p1;
            }
         }
         *p2 = '\0';
      }

      // Update the attributes of the file node to incldue the comment attribute.
      g_pFileLast->dwAttributes |= FILE_ATTRIBUTE_COMMENT;

      // Clear the file node so we don't try to add another bogus comment to it.
      g_pFileLast = NULL;

      return dwCount;
   }

   if (dwCount >= _MAX_PATH) {
      buffer[_MAX_PATH] = '\0';
   }
   DebugOut(TEXT("Unhandled call to win_fprintf(\"%S\")"), buffer);
   return dwCount;
}


//******************************************************************************
//***** Functions that Info-ZIP expects the port to write and export.
//***** Some of this code was stolen from the WIN32 port and highly modified.
//******************************************************************************

int mapattr(Uz_Globs *pG) {

   // Check to see if we are extracting this file for viewing.  Currently, we do
   // this by checking the szMappedPath member of our extract info stucture
   // since we know OnActionView() is the only one who sets this member.

   if (g_pExtractInfo && g_pExtractInfo->szMappedPath) {

      // If we are extracting for view only, then we ignore the file's real
      // attributes and force the file to create as read-only.  We make the file
      // read-only to help prevent the user from making changes to the temporary
      // file and then trying to save the changes back to a file that we will
      // eventually delete.
      pG->pInfo->file_attr = FILE_ATTRIBUTE_READONLY;

   } else {

      // Store the attribute exactly as it appears for normal extraction/test.
      pG->pInfo->file_attr = (unsigned)pG->crec.external_file_attributes & 0xff;
   }
   return PK_OK;
}

//******************************************************************************
void utimeToFileTime(time_t ut, FILETIME *pft, BOOL fOldFileSystem) {

   // time_t    is a 32-bit value for the seconds since January 1, 1970
   // FILETIME  is a 64-bit value for the number of 100-nanosecond intervals since
   //           January 1, 1601
   // DWORDLONG is a 64-bit int that we can use to perform large math operations.


   // time_t has minimum of 1/1/1970.  Many file systems, such as FAT, have a
   // minimum date of 1/1/1980.  If extracting to one of those file systems and
   // out time_t is less than 1980, then we make it 1/1/1980.
   // (365 days/yr * 10 yrs + 3 leap yr days) * (60 secs * 60 mins * 24 hrs).
   if (fOldFileSystem && (ut < 0x12CFF780)) {
      ut = 0x12CFF780;
   }

   // Compute the FILETIME for the given time_t.
   DWORDLONG dwl = ((DWORDLONG)116444736000000000 +
                   ((DWORDLONG)ut * (DWORDLONG)10000000));

   // Store the return value.
   *pft = *(FILETIME*)&dwl;

   // Now for the next fix for old file systems.  If we are in Daylight Savings
   // Time (DST) and the file is not in DST, then we need subtract off the DST
   // bias from the filetime.  This is due to a bug in Windows (NT, CE, and 95)
   // that causes the DST bias to be added to all file times when the system
   // is in DST, even if the file is not in DST.  This only effects old file
   // systems since they store local times instead of UTC times.  Newer file
   // systems like NTFS and CEFS store UTC times.

   if (fOldFileSystem) {

      // We use the CRT's localtime() and Win32's FileTimeToLocalTime()
      // functions to compute the DST bias.  This works because localtime()
      // correctly adds the DST bias only if the file time is in DST.
      // FileTimeToLocalTime() always adds the DST bias to the time.
      // Therefore, if the functions return different results, we know we
      // are dealing with a non-DST file during a system DST.

      FILETIME ftCRT, ftWin32;

      // Get the CRT result - result is a "tm" struct.