volume.cpp

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///////////////////////////////////////////////////////////////////////////////
// Name:        src/msw/volume.cpp
// Purpose:     wxFSVolume - encapsulates system volume information
// Author:      George Policello
// Modified by:
// Created:     28 Jan 02
// RCS-ID:      $Id: volume.cpp,v 1.28.2.1 2006/01/21 16:46:47 JS Exp $
// Copyright:   (c) 2002 George Policello
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "fsvolume.h"
#endif

#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_FSVOLUME

#ifndef WX_PRECOMP
    #if wxUSE_GUI
        #include "wx/icon.h"
    #endif
    #include "wx/intl.h"
#endif // WX_PRECOMP

#include "wx/dir.h"
#include "wx/hashmap.h"
#include "wx/dynlib.h"
#include "wx/arrimpl.cpp"

#include "wx/volume.h"

#include <shellapi.h>
#include <shlobj.h>
#include "wx/msw/missing.h"

#if wxUSE_BASE

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Dynamic library function defs.
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#if wxUSE_DYNLIB_CLASS
static wxDynamicLibrary s_mprLib;
#endif

typedef DWORD (WINAPI* WNetOpenEnumPtr)(DWORD, DWORD, DWORD, LPNETRESOURCE, LPHANDLE);
typedef DWORD (WINAPI* WNetEnumResourcePtr)(HANDLE, LPDWORD, LPVOID, LPDWORD);
typedef DWORD (WINAPI* WNetCloseEnumPtr)(HANDLE);

static WNetOpenEnumPtr s_pWNetOpenEnum;
static WNetEnumResourcePtr s_pWNetEnumResource;
static WNetCloseEnumPtr s_pWNetCloseEnum;

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Globals/Statics
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
static long s_cancelSearch = FALSE;

struct FileInfo
{
    FileInfo(unsigned flag=0, wxFSVolumeKind type=wxFS_VOL_OTHER) :
        m_flags(flag), m_type(type) {}

    FileInfo(const FileInfo& other) { *this = other; }
    FileInfo& operator=(const FileInfo& other)
    {
        m_flags = other.m_flags;
        m_type = other.m_type;
        return *this;
    }

    unsigned m_flags;
    wxFSVolumeKind m_type;
};
WX_DECLARE_STRING_HASH_MAP(FileInfo, FileInfoMap);
// Cygwin bug (?) destructor for global s_fileInfo is called twice...
static FileInfoMap& GetFileInfoMap()
{
    static FileInfoMap s_fileInfo(25);

    return s_fileInfo;
}
#define s_fileInfo (GetFileInfoMap())

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Local helper functions.
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//=============================================================================
// Function: GetBasicFlags
// Purpose: Set basic flags, primarily wxFS_VOL_REMOTE and wxFS_VOL_REMOVABLE.
// Notes: - Local and mapped drives are mounted by definition.  We have no
//          way to determine mounted status of network drives, so assume that
//          all drives are mounted, and let the caller decide otherwise.
//        - Other flags are 'best guess' from type of drive.  The system will
//          not report the file attributes with any degree of accuracy.
//=============================================================================
static unsigned GetBasicFlags(const wxChar* filename)
{
    unsigned flags = wxFS_VOL_MOUNTED;

    //----------------------------------
    // 'Best Guess' based on drive type.
    //----------------------------------
    wxFSVolumeKind type;
    switch(GetDriveType(filename))
    {
    case DRIVE_FIXED:
        type = wxFS_VOL_DISK;
        break;

    case DRIVE_REMOVABLE:
        flags |= wxFS_VOL_REMOVABLE;
        type = wxFS_VOL_FLOPPY;
        break;

    case DRIVE_CDROM:
        flags |= wxFS_VOL_REMOVABLE | wxFS_VOL_READONLY;
        type = wxFS_VOL_CDROM;
        break;

    case DRIVE_REMOTE:
        flags |= wxFS_VOL_REMOTE;
        type = wxFS_VOL_NETWORK;
        break;

    case DRIVE_NO_ROOT_DIR:
        flags &= ~wxFS_VOL_MOUNTED;
        type = wxFS_VOL_OTHER;
        break;

    default:
        type = wxFS_VOL_OTHER;
        break;
    }

    //-----------------------------------------------------------------------
    // The following will most likely will not modify anything not set above,
    // and will not work at all for network shares or empty CD ROM drives.
    // But it is a good check if the Win API ever gets better about reporting
    // this information.
    //-----------------------------------------------------------------------
    SHFILEINFO fi;
    long rc;
    rc = SHGetFileInfo(filename, 0, &fi, sizeof(fi), SHGFI_ATTRIBUTES );
    if (!rc)
    {
        wxLogError(_("Cannot read typename from '%s'!"), filename);
    }
    else
    {
        if (fi.dwAttributes & SFGAO_READONLY)
            flags |= wxFS_VOL_READONLY;
        if (fi.dwAttributes & SFGAO_REMOVABLE)
            flags |= wxFS_VOL_REMOVABLE;
    }

    //------------------
    // Flags are cached.
    //------------------
    s_fileInfo[filename] = FileInfo(flags, type);

    return flags;
} // GetBasicFlags

//=============================================================================
// Function: FilteredAdd
// Purpose: Add a file to the list if it meets the filter requirement.
// Notes: - See GetBasicFlags for remarks about the Mounted flag.
//=============================================================================
static bool FilteredAdd(wxArrayString& list, const wxChar* filename,
                        unsigned flagsSet, unsigned flagsUnset)
{
    bool accept = true;
    unsigned flags = GetBasicFlags(filename);

    if (flagsSet & wxFS_VOL_MOUNTED && !(flags & wxFS_VOL_MOUNTED))
        accept = false;
    else if (flagsUnset & wxFS_VOL_MOUNTED && (flags & wxFS_VOL_MOUNTED))
        accept = false;
    else if (flagsSet & wxFS_VOL_REMOVABLE && !(flags & wxFS_VOL_REMOVABLE))
        accept = false;
    else if (flagsUnset & wxFS_VOL_REMOVABLE && (flags & wxFS_VOL_REMOVABLE))
        accept = false;
    else if (flagsSet & wxFS_VOL_READONLY && !(flags & wxFS_VOL_READONLY))
        accept = false;
    else if (flagsUnset & wxFS_VOL_READONLY && (flags & wxFS_VOL_READONLY))
        accept = false;
    else if (flagsSet & wxFS_VOL_REMOTE && !(flags & wxFS_VOL_REMOTE))
        accept = false;
    else if (flagsUnset & wxFS_VOL_REMOTE && (flags & wxFS_VOL_REMOTE))
        accept = false;

    // Add to the list if passed the filter.
    if (accept)
        list.Add(filename);

    return accept;
} // FilteredAdd

//=============================================================================
// Function: BuildListFromNN
// Purpose: Append or remove items from the list
// Notes: - There is no way to find all disconnected NN items, or even to find
//          all items while determining which are connected and not.  So this
//          function will find either all items or connected items.
//=============================================================================
static void BuildListFromNN(wxArrayString& list, NETRESOURCE* pResSrc,
                            unsigned flagsSet, unsigned flagsUnset)
{
    HANDLE hEnum;
    int rc;

    //-----------------------------------------------
    // Scope may be all drives or all mounted drives.
    //-----------------------------------------------
    unsigned scope = RESOURCE_GLOBALNET;
    if (flagsSet & wxFS_VOL_MOUNTED)
        scope = RESOURCE_CONNECTED;

    //----------------------------------------------------------------------
    // Enumerate all items, adding only non-containers (ie. network shares).
    // Containers cause a recursive call to this function for their own
    // enumeration.
    //----------------------------------------------------------------------
    if (rc = s_pWNetOpenEnum(scope, RESOURCETYPE_DISK, 0, pResSrc, &hEnum), rc == NO_ERROR)
    {
        DWORD count = 1;
        DWORD size = 256;
        NETRESOURCE* pRes = (NETRESOURCE*)malloc(size);
        memset(pRes, 0, sizeof(NETRESOURCE));
        while (rc = s_pWNetEnumResource(hEnum, &count, pRes, &size), rc == NO_ERROR || rc == ERROR_MORE_DATA)
        {
            if (s_cancelSearch)
                break;

            if (rc == ERROR_MORE_DATA)
            {
                pRes = (NETRESOURCE*)realloc(pRes, size);
                count = 1;
            }
            else if (count == 1)
            {
                // Enumerate the container.
                if (pRes->dwUsage & RESOURCEUSAGE_CONTAINER)
                {
                    BuildListFromNN(list, pRes, flagsSet, flagsUnset);
                }

                // Add the network share.
                else
                {
                    wxString filename(pRes->lpRemoteName);

                    if (filename.Len())
                    {
                        if (filename.Last() != '\\')
                            filename.Append('\\');

                        // The filter function will not know mounted from unmounted, and neither do we unless
                        // we are iterating using RESOURCE_CONNECTED, in which case they all are mounted.
                        // Volumes on disconnected servers, however, will correctly show as unmounted.
                        FilteredAdd(list, filename, flagsSet, flagsUnset&~wxFS_VOL_MOUNTED);
                        if (scope == RESOURCE_GLOBALNET)
                            s_fileInfo[filename].m_flags &= ~wxFS_VOL_MOUNTED;
                    }
                }
            }
            else if (count == 0)
                break;
        }
        free(pRes);
        s_pWNetCloseEnum(hEnum);
    }
} // BuildListFromNN

//=============================================================================
// Function: CompareFcn
// Purpose: Used to sort the NN list alphabetically, case insensitive.
//=============================================================================
static int CompareFcn(const wxString& first, const wxString& second)
{
    return wxStricmp(first.c_str(), second.c_str());
} // CompareFcn

//=============================================================================
// Function: BuildRemoteList
// Purpose: Append Network Neighborhood items to the list.
// Notes: - Mounted gets transalated into Connected.  FilteredAdd is told
//          to ignore the Mounted flag since we need to handle it in a weird
//          way manually.
//        - The resulting list is sorted alphabetically.
//=============================================================================