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JUCE/src/native/windows/juce_win32_Files.cpp

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C++

/*
==============================================================================
This file is part of the JUCE library - "Jules' Utility Class Extensions"
Copyright 2004-9 by Raw Material Software Ltd.
------------------------------------------------------------------------------
JUCE can be redistributed and/or modified under the terms of the GNU General
Public License (Version 2), as published by the Free Software Foundation.
A copy of the license is included in the JUCE distribution, or can be found
online at www.gnu.org/licenses.
JUCE 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 General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.rawmaterialsoftware.com/juce for more information.
==============================================================================
*/
// (This file gets included by juce_win32_NativeCode.cpp, rather than being
// compiled on its own).
#if JUCE_INCLUDED_FILE
//==============================================================================
#ifndef CSIDL_MYMUSIC
#define CSIDL_MYMUSIC 0x000d
#endif
#ifndef CSIDL_MYVIDEO
#define CSIDL_MYVIDEO 0x000e
#endif
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD) -1)
#endif
//==============================================================================
const juce_wchar File::separator = T('\\');
const juce_wchar* File::separatorString = T("\\");
//==============================================================================
bool juce_fileExists (const String& fileName, const bool dontCountDirectories)
{
if (fileName.isEmpty())
return false;
const DWORD attr = GetFileAttributes (fileName);
return dontCountDirectories ? ((attr & FILE_ATTRIBUTE_DIRECTORY) == 0)
: (attr != INVALID_FILE_ATTRIBUTES);
}
bool juce_isDirectory (const String& fileName)
{
const DWORD attr = GetFileAttributes (fileName);
return ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) && (attr != INVALID_FILE_ATTRIBUTES);
}
bool juce_canWriteToFile (const String& fileName)
{
const DWORD attr = GetFileAttributes (fileName);
return (attr & FILE_ATTRIBUTE_READONLY) == 0;
}
bool juce_setFileReadOnly (const String& fileName, bool isReadOnly)
{
DWORD attr = GetFileAttributes (fileName);
if (attr == INVALID_FILE_ATTRIBUTES)
return false;
if (isReadOnly != juce_canWriteToFile (fileName))
return true;
if (isReadOnly)
attr |= FILE_ATTRIBUTE_READONLY;
else
attr &= ~FILE_ATTRIBUTE_READONLY;
return SetFileAttributes (fileName, attr) != FALSE;
}
bool File::isHidden() const
{
return (GetFileAttributes (getFullPathName()) & FILE_ATTRIBUTE_HIDDEN) != 0;
}
//==============================================================================
bool juce_deleteFile (const String& fileName)
{
if (juce_isDirectory (fileName))
return RemoveDirectory (fileName) != 0;
return DeleteFile (fileName) != 0;
}
bool File::moveToTrash() const
{
if (! exists())
return true;
SHFILEOPSTRUCT fos;
zerostruct (fos);
// The string we pass in must be double null terminated..
String doubleNullTermPath (getFullPathName() + " ");
TCHAR* const p = const_cast <TCHAR*> (static_cast <const TCHAR*> (doubleNullTermPath));
p [getFullPathName().length()] = 0;
fos.wFunc = FO_DELETE;
fos.pFrom = p;
fos.fFlags = FOF_ALLOWUNDO | FOF_NOERRORUI | FOF_SILENT | FOF_NOCONFIRMATION
| FOF_NOCONFIRMMKDIR | FOF_RENAMEONCOLLISION;
return SHFileOperation (&fos) == 0;
}
bool juce_moveFile (const String& source, const String& dest)
{
return MoveFile (source, dest) != 0;
}
bool juce_copyFile (const String& source, const String& dest)
{
return CopyFile (source, dest, false) != 0;
}
void juce_createDirectory (const String& fileName)
{
if (! juce_fileExists (fileName, true))
CreateDirectory (fileName, 0);
}
//==============================================================================
// return 0 if not possible
void* juce_fileOpen (const String& fileName, bool forWriting)
{
HANDLE h;
if (forWriting)
{
h = CreateFile (fileName, GENERIC_WRITE, FILE_SHARE_READ, 0,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (h != INVALID_HANDLE_VALUE)
SetFilePointer (h, 0, 0, FILE_END);
else
h = 0;
}
else
{
h = CreateFile (fileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (h == INVALID_HANDLE_VALUE)
h = 0;
}
return (void*) h;
}
void juce_fileClose (void* handle)
{
CloseHandle (handle);
}
//==============================================================================
int juce_fileRead (void* handle, void* buffer, int size)
{
DWORD num = 0;
ReadFile ((HANDLE) handle, buffer, size, &num, 0);
return (int) num;
}
int juce_fileWrite (void* handle, const void* buffer, int size)
{
DWORD num;
WriteFile ((HANDLE) handle, buffer, size, &num, 0);
return (int) num;
}
int64 juce_fileSetPosition (void* handle, int64 pos)
{
LARGE_INTEGER li;
li.QuadPart = pos;
li.LowPart = SetFilePointer ((HANDLE) handle, li.LowPart, &li.HighPart, FILE_BEGIN); // (returns -1 if it fails)
return li.QuadPart;
}
int64 juce_fileGetPosition (void* handle)
{
LARGE_INTEGER li;
li.QuadPart = 0;
li.LowPart = SetFilePointer ((HANDLE) handle, 0, &li.HighPart, FILE_CURRENT); // (returns -1 if it fails)
return jmax ((int64) 0, li.QuadPart);
}
void juce_fileFlush (void* handle)
{
FlushFileBuffers ((HANDLE) handle);
}
int64 juce_getFileSize (const String& fileName)
{
WIN32_FILE_ATTRIBUTE_DATA attributes;
if (GetFileAttributesEx (fileName, GetFileExInfoStandard, &attributes))
return (((int64) attributes.nFileSizeHigh) << 32) | attributes.nFileSizeLow;
return 0;
}
//==============================================================================
static int64 fileTimeToTime (const FILETIME* const ft)
{
static_jassert (sizeof (ULARGE_INTEGER) == sizeof (FILETIME)); // tell me if this fails!
return (reinterpret_cast<const ULARGE_INTEGER*> (ft)->QuadPart - literal64bit (116444736000000000)) / 10000;
}
static void timeToFileTime (const int64 time, FILETIME* const ft)
{
reinterpret_cast<ULARGE_INTEGER*> (ft)->QuadPart = time * 10000 + literal64bit (116444736000000000);
}
void juce_getFileTimes (const String& fileName,
int64& modificationTime,
int64& accessTime,
int64& creationTime)
{
WIN32_FILE_ATTRIBUTE_DATA attributes;
if (GetFileAttributesEx (fileName, GetFileExInfoStandard, &attributes))
{
modificationTime = fileTimeToTime (&attributes.ftLastWriteTime);
creationTime = fileTimeToTime (&attributes.ftCreationTime);
accessTime = fileTimeToTime (&attributes.ftLastAccessTime);
}
else
{
creationTime = accessTime = modificationTime = 0;
}
}
bool juce_setFileTimes (const String& fileName,
int64 modificationTime,
int64 accessTime,
int64 creationTime)
{
void* const h = juce_fileOpen (fileName, true);
bool ok = false;
if (h != 0)
{
FILETIME m, a, c;
timeToFileTime (modificationTime, &m);
timeToFileTime (accessTime, &a);
timeToFileTime (creationTime, &c);
ok = SetFileTime ((HANDLE) h,
creationTime > 0 ? &c : 0,
accessTime > 0 ? &a : 0,
modificationTime > 0 ? &m : 0) != 0;
juce_fileClose (h);
}
return ok;
}
//==============================================================================
// return '\0' separated list of strings
const StringArray juce_getFileSystemRoots()
{
TCHAR buffer [2048];
buffer[0] = 0;
buffer[1] = 0;
GetLogicalDriveStrings (2048, buffer);
const TCHAR* n = buffer;
StringArray roots;
while (*n != 0)
{
roots.add (String (n));
while (*n++ != 0)
{}
}
roots.sort (true);
return roots;
}
//==============================================================================
static const String getDriveFromPath (const String& path)
{
if (path.isNotEmpty() && path[1] == T(':'))
return path.substring (0, 2) + T("\\");
return path;
}
const String juce_getVolumeLabel (const String& filenameOnVolume,
int& volumeSerialNumber)
{
TCHAR dest[64];
DWORD serialNum;
if (! GetVolumeInformation (getDriveFromPath (filenameOnVolume), dest,
numElementsInArray (dest), &serialNum, 0, 0, 0, 0))
{
dest[0] = 0;
serialNum = 0;
}
volumeSerialNumber = serialNum;
return dest;
}
static int64 getDiskSpaceInfo (const String& path, const bool total)
{
ULARGE_INTEGER spc, tot, totFree;
if (GetDiskFreeSpaceEx (getDriveFromPath (path), &spc, &tot, &totFree))
return total ? (int64) tot.QuadPart
: (int64) spc.QuadPart;
return 0;
}
int64 File::getBytesFreeOnVolume() const
{
return getDiskSpaceInfo (getFullPathName(), false);
}
int64 File::getVolumeTotalSize() const
{
return getDiskSpaceInfo (getFullPathName(), true);
}
//==============================================================================
static unsigned int getWindowsDriveType (const String& path)
{
return GetDriveType (getDriveFromPath (path));
}
bool File::isOnCDRomDrive() const
{
return getWindowsDriveType (getFullPathName()) == DRIVE_CDROM;
}
bool File::isOnHardDisk() const
{
if (fullPath.isEmpty())
return false;
const unsigned int n = getWindowsDriveType (getFullPathName());
if (fullPath.toLowerCase()[0] <= 'b' && fullPath[1] == T(':'))
return n != DRIVE_REMOVABLE;
else
return n != DRIVE_CDROM && n != DRIVE_REMOTE;
}
bool File::isOnRemovableDrive() const
{
if (fullPath.isEmpty())
return false;
const unsigned int n = getWindowsDriveType (getFullPathName());
return n == DRIVE_CDROM
|| n == DRIVE_REMOTE
|| n == DRIVE_REMOVABLE
|| n == DRIVE_RAMDISK;
}
//==============================================================================
static const File juce_getSpecialFolderPath (int type)
{
WCHAR path [MAX_PATH + 256];
if (SHGetSpecialFolderPath (0, path, type, FALSE))
return File (String (path));
return File::nonexistent;
}
const File JUCE_CALLTYPE File::getSpecialLocation (const SpecialLocationType type)
{
int csidlType = 0;
switch (type)
{
case userHomeDirectory: csidlType = CSIDL_PROFILE; break;
case userDocumentsDirectory: csidlType = CSIDL_PERSONAL; break;
case userDesktopDirectory: csidlType = CSIDL_DESKTOP; break;
case userApplicationDataDirectory: csidlType = CSIDL_APPDATA; break;
case commonApplicationDataDirectory: csidlType = CSIDL_COMMON_APPDATA; break;
case globalApplicationsDirectory: csidlType = CSIDL_PROGRAM_FILES; break;
case userMusicDirectory: csidlType = CSIDL_MYMUSIC; break;
case userMoviesDirectory: csidlType = CSIDL_MYVIDEO; break;
case tempDirectory:
{
WCHAR dest [2048];
dest[0] = 0;
GetTempPath (numElementsInArray (dest), dest);
return File (String (dest));
}
case invokedExecutableFile:
case currentExecutableFile:
case currentApplicationFile:
{
HINSTANCE moduleHandle = (HINSTANCE) PlatformUtilities::getCurrentModuleInstanceHandle();
WCHAR dest [MAX_PATH + 256];
dest[0] = 0;
GetModuleFileName (moduleHandle, dest, numElementsInArray (dest));
return File (String (dest));
}
break;
default:
jassertfalse // unknown type?
return File::nonexistent;
}
return juce_getSpecialFolderPath (csidlType);
}
//==============================================================================
const File File::getCurrentWorkingDirectory()
{
WCHAR dest [MAX_PATH + 256];
dest[0] = 0;
GetCurrentDirectory (numElementsInArray (dest), dest);
return File (String (dest));
}
bool File::setAsCurrentWorkingDirectory() const
{
return SetCurrentDirectory (getFullPathName()) != FALSE;
}
//==============================================================================
const String File::getVersion() const
{
String result;
DWORD handle = 0;
DWORD bufferSize = GetFileVersionInfoSize (getFullPathName(), &handle);
HeapBlock<char> buffer;
buffer.calloc (bufferSize);
if (GetFileVersionInfo (getFullPathName(), 0, bufferSize, buffer))
{
VS_FIXEDFILEINFO* vffi;
UINT len = 0;
if (VerQueryValue (buffer, (LPTSTR) _T("\\"), (LPVOID*) &vffi, &len))
{
result << (int) HIWORD (vffi->dwFileVersionMS) << '.'
<< (int) LOWORD (vffi->dwFileVersionMS) << '.'
<< (int) HIWORD (vffi->dwFileVersionLS) << '.'
<< (int) LOWORD (vffi->dwFileVersionLS);
}
}
return result;
}
//==============================================================================
const File File::getLinkedTarget() const
{
File result (*this);
String p (getFullPathName());
if (! exists())
p += T(".lnk");
else if (getFileExtension() != T(".lnk"))
return result;
ComSmartPtr <IShellLink> shellLink;
if (SUCCEEDED (shellLink.CoCreateInstance (CLSID_ShellLink, CLSCTX_INPROC_SERVER)))
{
ComSmartPtr <IPersistFile> persistFile;
if (SUCCEEDED (shellLink->QueryInterface (IID_IPersistFile, (LPVOID*) &persistFile)))
{
if (SUCCEEDED (persistFile->Load ((const WCHAR*) p, STGM_READ))
&& SUCCEEDED (shellLink->Resolve (0, SLR_ANY_MATCH | SLR_NO_UI)))
{
WIN32_FIND_DATA winFindData;
WCHAR resolvedPath [MAX_PATH];
if (SUCCEEDED (shellLink->GetPath (resolvedPath, MAX_PATH, &winFindData, SLGP_UNCPRIORITY)))
result = File (resolvedPath);
}
}
}
return result;
}
//==============================================================================
template <class FindDataType>
static void getFindFileInfo (FindDataType& findData,
String& filename, bool* const isDir, bool* const isHidden,
int64* const fileSize, Time* const modTime, Time* const creationTime,
bool* const isReadOnly)
{
filename = findData.cFileName;
if (isDir != 0)
*isDir = ((findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0);
if (isHidden != 0)
*isHidden = ((findData.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) != 0);
if (fileSize != 0)
*fileSize = findData.nFileSizeLow + (((int64) findData.nFileSizeHigh) << 32);
if (modTime != 0)
*modTime = fileTimeToTime (&findData.ftLastWriteTime);
if (creationTime != 0)
*creationTime = fileTimeToTime (&findData.ftCreationTime);
if (isReadOnly != 0)
*isReadOnly = ((findData.dwFileAttributes & FILE_ATTRIBUTE_READONLY) != 0);
}
void* juce_findFileStart (const String& directory, const String& wildCard, String& firstResult,
bool* isDir, bool* isHidden, int64* fileSize,
Time* modTime, Time* creationTime, bool* isReadOnly)
{
String wc (directory);
if (! wc.endsWithChar (File::separator))
wc += File::separator;
wc += wildCard;
WIN32_FIND_DATA findData;
HANDLE h = FindFirstFile (wc, &findData);
if (h != INVALID_HANDLE_VALUE)
{
getFindFileInfo (findData, firstResult, isDir, isHidden, fileSize,
modTime, creationTime, isReadOnly);
return h;
}
firstResult = String::empty;
return 0;
}
bool juce_findFileNext (void* handle, String& resultFile,
bool* isDir, bool* isHidden, int64* fileSize,
Time* modTime, Time* creationTime, bool* isReadOnly)
{
WIN32_FIND_DATA findData;
if (handle != 0 && FindNextFile ((HANDLE) handle, &findData) != 0)
{
getFindFileInfo (findData, resultFile, isDir, isHidden, fileSize,
modTime, creationTime, isReadOnly);
return true;
}
resultFile = String::empty;
return false;
}
void juce_findFileClose (void* handle)
{
FindClose (handle);
}
//==============================================================================
bool juce_launchFile (const String& fileName, const String& parameters)
{
HINSTANCE hInstance = 0;
JUCE_TRY
{
hInstance = ShellExecute (0, 0, fileName, parameters, 0, SW_SHOWDEFAULT);
}
JUCE_CATCH_ALL
return hInstance > (HINSTANCE) 32;
}
void File::revealToUser() const
{
if (isDirectory())
startAsProcess();
else if (getParentDirectory().exists())
getParentDirectory().startAsProcess();
}
//==============================================================================
class NamedPipeInternal
{
public:
NamedPipeInternal (const String& file, const bool isPipe_)
: pipeH (0),
cancelEvent (0),
connected (false),
isPipe (isPipe_)
{
cancelEvent = CreateEvent (0, FALSE, FALSE, 0);
pipeH = isPipe ? CreateNamedPipe (file, PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, 0,
PIPE_UNLIMITED_INSTANCES, 4096, 4096, 0, 0)
: CreateFile (file, GENERIC_READ | GENERIC_WRITE, 0, 0,
OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
}
~NamedPipeInternal()
{
disconnectPipe();
if (pipeH != 0)
CloseHandle (pipeH);
CloseHandle (cancelEvent);
}
bool connect (const int timeOutMs)
{
if (! isPipe)
return true;
if (! connected)
{
OVERLAPPED over;
zerostruct (over);
over.hEvent = CreateEvent (0, TRUE, FALSE, 0);
if (ConnectNamedPipe (pipeH, &over))
{
connected = false; // yes, you read that right. In overlapped mode it should always return 0.
}
else
{
const int err = GetLastError();
if (err == ERROR_IO_PENDING || err == ERROR_PIPE_LISTENING)
{
HANDLE handles[] = { over.hEvent, cancelEvent };
if (WaitForMultipleObjects (2, handles, FALSE,
timeOutMs >= 0 ? timeOutMs : INFINITE) == WAIT_OBJECT_0)
connected = true;
}
else if (err == ERROR_PIPE_CONNECTED)
{
connected = true;
}
}
CloseHandle (over.hEvent);
}
return connected;
}
void disconnectPipe()
{
if (connected)
{
DisconnectNamedPipe (pipeH);
connected = false;
}
}
HANDLE pipeH;
HANDLE cancelEvent;
bool connected, isPipe;
};
void NamedPipe::close()
{
cancelPendingReads();
const ScopedLock sl (lock);
delete static_cast<NamedPipeInternal*> (internal);
internal = 0;
}
bool NamedPipe::openInternal (const String& pipeName, const bool createPipe)
{
close();
ScopedPointer<NamedPipeInternal> intern (new NamedPipeInternal ("\\\\.\\pipe\\" + pipeName, createPipe));
if (intern->pipeH != INVALID_HANDLE_VALUE)
{
internal = intern.release();
return true;
}
return false;
}
int NamedPipe::read (void* destBuffer, int maxBytesToRead, int timeOutMilliseconds)
{
const ScopedLock sl (lock);
int bytesRead = -1;
bool waitAgain = true;
while (waitAgain && internal != 0)
{
NamedPipeInternal* const intern = static_cast<NamedPipeInternal*> (internal);
waitAgain = false;
if (! intern->connect (timeOutMilliseconds))
break;
if (maxBytesToRead <= 0)
return 0;
OVERLAPPED over;
zerostruct (over);
over.hEvent = CreateEvent (0, TRUE, FALSE, 0);
unsigned long numRead;
if (ReadFile (intern->pipeH, destBuffer, maxBytesToRead, &numRead, &over))
{
bytesRead = (int) numRead;
}
else if (GetLastError() == ERROR_IO_PENDING)
{
HANDLE handles[] = { over.hEvent, intern->cancelEvent };
DWORD waitResult = WaitForMultipleObjects (2, handles, FALSE,
timeOutMilliseconds >= 0 ? timeOutMilliseconds
: INFINITE);
if (waitResult != WAIT_OBJECT_0)
{
// if the operation timed out, let's cancel it...
CancelIo (intern->pipeH);
WaitForSingleObject (over.hEvent, INFINITE); // makes sure cancel is complete
}
if (GetOverlappedResult (intern->pipeH, &over, &numRead, FALSE))
{
bytesRead = (int) numRead;
}
else if (GetLastError() == ERROR_BROKEN_PIPE && intern->isPipe)
{
intern->disconnectPipe();
waitAgain = true;
}
}
else
{
waitAgain = internal != 0;
Sleep (5);
}
CloseHandle (over.hEvent);
}
return bytesRead;
}
int NamedPipe::write (const void* sourceBuffer, int numBytesToWrite, int timeOutMilliseconds)
{
int bytesWritten = -1;
NamedPipeInternal* const intern = static_cast<NamedPipeInternal*> (internal);
if (intern != 0 && intern->connect (timeOutMilliseconds))
{
if (numBytesToWrite <= 0)
return 0;
OVERLAPPED over;
zerostruct (over);
over.hEvent = CreateEvent (0, TRUE, FALSE, 0);
unsigned long numWritten;
if (WriteFile (intern->pipeH, sourceBuffer, numBytesToWrite, &numWritten, &over))
{
bytesWritten = (int) numWritten;
}
else if (GetLastError() == ERROR_IO_PENDING)
{
HANDLE handles[] = { over.hEvent, intern->cancelEvent };
DWORD waitResult;
waitResult = WaitForMultipleObjects (2, handles, FALSE,
timeOutMilliseconds >= 0 ? timeOutMilliseconds
: INFINITE);
if (waitResult != WAIT_OBJECT_0)
{
CancelIo (intern->pipeH);
WaitForSingleObject (over.hEvent, INFINITE);
}
if (GetOverlappedResult (intern->pipeH, &over, &numWritten, FALSE))
{
bytesWritten = (int) numWritten;
}
else if (GetLastError() == ERROR_BROKEN_PIPE && intern->isPipe)
{
intern->disconnectPipe();
}
}
CloseHandle (over.hEvent);
}
return bytesWritten;
}
void NamedPipe::cancelPendingReads()
{
if (internal != 0)
SetEvent (static_cast<NamedPipeInternal*> (internal)->cancelEvent);
}
#endif