winfs.cpp

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/*
 * Copyright 2003, 2004, 2005 Martin Fuchs
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */


 //
 // Explorer clone
 //
 // winfs.cpp
 //
 // Martin Fuchs, 23.07.2003
 //


#include <precomp.h>

#ifndef _NO_WIN_FS

//#include "winfs.h"


int ScanNTFSStreams(Entry* entry, HANDLE hFile)
{
    PVOID ctx = 0;
    DWORD read, seek_high;
    Entry** pnext = &entry->_down;
    int cnt = 0;

    for(;;) {
        struct NTFS_StreamHdr : public WIN32_STREAM_ID {
            WCHAR name_padding[_MAX_FNAME]; // room for reading stream name
        } hdr;

        if (!BackupRead(hFile, (LPBYTE)&hdr, (LPBYTE)&hdr.cStreamName-(LPBYTE)&hdr, &read, FALSE, FALSE, &ctx) ||
            (long)read!=(LPBYTE)&hdr.cStreamName-(LPBYTE)&hdr)
            break;

        if (hdr.dwStreamId == BACKUP_ALTERNATE_DATA) {
            if (hdr.dwStreamNameSize &&
                BackupRead(hFile, (LPBYTE)hdr.cStreamName, hdr.dwStreamNameSize, &read, FALSE, FALSE, &ctx) &&
                read==hdr.dwStreamNameSize)
            {
                ++cnt;

                int l = hdr.dwStreamNameSize / sizeof(WCHAR);
                LPCWSTR p = hdr.cStreamName;
                LPCWSTR e = hdr.cStreamName + l;

                if (l>0 && *p==':') {
                    ++p, --l;

                    e = p;

                    while(l>0 && *e!=':')
                        ++e, --l;

                    l = e - p;
                }

                Entry* stream_entry = new WinEntry(entry);

                memcpy(&stream_entry->_data, &entry->_data, sizeof(WIN32_FIND_DATA));
                lstrcpy(stream_entry->_data.cFileName, String(p, l));

                stream_entry->_down = NULL;
                stream_entry->_expanded = false;
                stream_entry->_scanned = false;
                stream_entry->_level = entry->_level + 1;

                *pnext = stream_entry;
                pnext = &stream_entry->_next;
            }
        }

         // jump to the next stream header
        if (!BackupSeek(hFile, ~0, ~0, &read, &seek_high, &ctx)) {
            DWORD error = GetLastError();

            if (error != ERROR_SEEK) {
                BackupRead(hFile, 0, 0, &read, TRUE, FALSE, &ctx);  // terminate BackupRead() loop
                THROW_EXCEPTION(error);
                //break;
            }

            hdr.Size.QuadPart -= read;
            hdr.Size.HighPart -= seek_high;

            BYTE buffer[4096];

            while(hdr.Size.QuadPart > 0) {
                if (!BackupRead(hFile, buffer, sizeof(buffer), &read, FALSE, FALSE, &ctx) || read!=sizeof(buffer))
                    break;

                hdr.Size.QuadPart -= read;
            }
        }
    }

    if (ctx)
        if (!BackupRead(hFile, 0, 0, &read, TRUE, FALSE, &ctx)) // terminate BackupRead() loop
            THROW_EXCEPTION(GetLastError());

    return cnt;
}


void WinDirectory::read_directory(int scan_flags)
{
    CONTEXT("WinDirectory::read_directory()");

    int level = _level + 1;

    Entry* first_entry = NULL;
    Entry* last = NULL;
    Entry* entry;

    LPCTSTR path = (LPCTSTR)_path;
    TCHAR buffer[MAX_PATH], *pname;
    for(pname=buffer; *path; )
        *pname++ = *path++;

    lstrcpy(pname, TEXT("\\*"));

    WIN32_FIND_DATA w32fd;
    HANDLE hFind = FindFirstFile(buffer, &w32fd);

    if (hFind != INVALID_HANDLE_VALUE) {
        do {
            lstrcpy(pname+1, w32fd.cFileName);

            if (w32fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                entry = new WinDirectory(this, buffer);
            else
                entry = new WinEntry(this);

            if (!first_entry)
                first_entry = entry;

            if (last)
                last->_next = entry;

            memcpy(&entry->_data, &w32fd, sizeof(WIN32_FIND_DATA));
            entry->_level = level;

             // display file type names, but don't hide file extensions
            g_Globals._ftype_mgr.set_type(entry, true);

            if (!(scan_flags & SCAN_DONT_ACCESS)) {
                HANDLE hFile = CreateFile(buffer, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
                                            0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);

                if (hFile != INVALID_HANDLE_VALUE) {
                    if (GetFileInformationByHandle(hFile, &entry->_bhfi))
                        entry->_bhfi_valid = true;

                    if (ScanNTFSStreams(entry, hFile))
                        entry->_scanned = true; // There exist named NTFS sub-streams in this file.

                    CloseHandle(hFile);
                }
            }

            last = entry;   // There is always at least one entry, because FindFirstFile() succeeded and we don't filter the file entries.
        } while(FindNextFile(hFind, &w32fd));

        if (last)
            last->_next = NULL;

        FindClose(hFind);
    }

    _down = first_entry;
    _scanned = true;
}


const void* WinDirectory::get_next_path_component(const void* p) const
{
    LPCTSTR s = (LPCTSTR) p;

    while(*s && *s!=TEXT('\\') && *s!=TEXT('/'))
        ++s;

    while(*s==TEXT('\\') || *s==TEXT('/'))
        ++s;

    if (!*s)
        return NULL;

    return s;
}


Entry* WinDirectory::find_entry(const void* p)
{
    LPCTSTR name = (LPCTSTR)p;

    for(Entry*entry=_down; entry; entry=entry->_next) {
        LPCTSTR p = name;
        LPCTSTR q = entry->_data.cFileName;

        do {
            if (!*p || *p==TEXT('\\') || *p==TEXT('/'))
                return entry;
        } while(tolower(*p++) == tolower(*q++));

        p = name;
        q = entry->_data.cAlternateFileName;

        do {
            if (!*p || *p==TEXT('\\') || *p==TEXT('/'))
                return entry;
        } while(tolower(*p++) == tolower(*q++));
    }

    return NULL;
}


 // get full path of specified directory entry
bool WinEntry::get_path(PTSTR path, size_t path_count) const
{
    return get_path_base(path, path_count, ET_WINDOWS);
}

ShellPath WinEntry::create_absolute_pidl() const
{
    CONTEXT("WinEntry::create_absolute_pidl()");

    TCHAR path[MAX_PATH];

    if (get_path(path, COUNTOF(path)))
        return ShellPath(path);

    return ShellPath();
}

#endif // _NO_WIN_FS