Mercurial > vba-clojure

     1 // Windows/FileIO.cpp

     2 

     3 #include "StdAfx.h"

     4 

     5 #include "FileIO.h"

     6 #include "Defs.h"

     7 #ifdef WIN_LONG_PATH

     8 #include "../Common/MyString.h"

     9 #endif

    10 #ifndef _UNICODE

    11 #include "../Common/StringConvert.h"

    12 #endif

    13 

    14 #ifndef _UNICODE

    15 extern bool g_IsNT;

    16 #endif

    17 

    18 namespace NWindows {

    19 namespace NFile {

    20 

    21 #if defined(WIN_LONG_PATH) && defined(_UNICODE)

    22 #define WIN_LONG_PATH2

    23 #endif

    24 

    25 #ifdef WIN_LONG_PATH

    26 bool GetLongPathBase(LPCWSTR s, UString &res)

    27 {

    28   res.Empty();

    29   int len = MyStringLen(s);

    30   wchar_t c = s[0];

    31   if (len < 1 || c == L'\\' || c == L'.' && (len == 1 || len == 2 && s[1] == L'.'))

    32     return true;

    33   UString curDir;

    34   bool isAbs = false;

    35   if (len > 3)

    36     isAbs = (s[1] == L':' && s[2] == L'\\' && (c >= L'a' && c <= L'z' || c >= L'A' && c <= L'Z'));

    37 

    38   if (!isAbs)

    39     {

    40       DWORD needLength = ::GetCurrentDirectoryW(MAX_PATH + 1, curDir.GetBuffer(MAX_PATH + 1));

    41       curDir.ReleaseBuffer();

    42       if (needLength == 0 || needLength > MAX_PATH)

    43         return false;

    44       if (curDir[curDir.Length() - 1] != L'\\')

    45         curDir += L'\\';

    46     }

    47   res = UString(L"\\\\?\\") + curDir + s;

    48   return true;

    49 }

    50 

    51 bool GetLongPath(LPCWSTR path, UString &longPath)

    52 {

    53   if (GetLongPathBase(path, longPath))

    54     return !longPath.IsEmpty();

    55   return false;

    56 }

    57 #endif

    58 

    59 namespace NIO {

    60 

    61 CFileBase::~CFileBase() { Close(); }

    62 

    63 bool CFileBase::Create(LPCTSTR fileName, DWORD desiredAccess,

    64     DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

    65 {

    66   if (!Close())

    67     return false;

    68   _handle = ::CreateFile(fileName, desiredAccess, shareMode,

    69       (LPSECURITY_ATTRIBUTES)NULL, creationDisposition,

    70       flagsAndAttributes, (HANDLE)NULL);

    71   #ifdef WIN_LONG_PATH2

    72   if (_handle == INVALID_HANDLE_VALUE)

    73   {

    74     UString longPath;

    75     if (GetLongPath(fileName, longPath))

    76       _handle = ::CreateFileW(longPath, desiredAccess, shareMode,

    77         (LPSECURITY_ATTRIBUTES)NULL, creationDisposition,

    78         flagsAndAttributes, (HANDLE)NULL);

    79   }

    80   #endif

    81   return (_handle != INVALID_HANDLE_VALUE);

    82 }

    83 

    84 #ifndef _UNICODE

    85 bool CFileBase::Create(LPCWSTR fileName, DWORD desiredAccess,

    86     DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

    87 {

    88   if (!g_IsNT)

    89     return Create(UnicodeStringToMultiByte(fileName, ::AreFileApisANSI() ? CP_ACP : CP_OEMCP),

    90       desiredAccess, shareMode, creationDisposition, flagsAndAttributes);

    91   if (!Close())

    92     return false;

    93   _handle = ::CreateFileW(fileName, desiredAccess, shareMode,

    94     (LPSECURITY_ATTRIBUTES)NULL, creationDisposition,

    95     flagsAndAttributes, (HANDLE)NULL);

    96   #ifdef WIN_LONG_PATH

    97   if (_handle == INVALID_HANDLE_VALUE)

    98   {

    99     UString longPath;

   100     if (GetLongPath(fileName, longPath))

   101       _handle = ::CreateFileW(longPath, desiredAccess, shareMode,

   102         (LPSECURITY_ATTRIBUTES)NULL, creationDisposition,

   103         flagsAndAttributes, (HANDLE)NULL);

   104   }

   105   #endif

   106   return (_handle != INVALID_HANDLE_VALUE);

   107 }

   108 #endif

   109 

   110 bool CFileBase::Close()

   111 {

   112   if (_handle == INVALID_HANDLE_VALUE)

   113     return true;

   114   if (!::CloseHandle(_handle))

   115     return false;

   116   _handle = INVALID_HANDLE_VALUE;

   117   return true;

   118 }

   119 

   120 bool CFileBase::GetPosition(UInt64 &position) const

   121 {

   122   return Seek(0, FILE_CURRENT, position);

   123 }

   124 

   125 bool CFileBase::GetLength(UInt64 &length) const

   126 {

   127   DWORD sizeHigh;

   128   DWORD sizeLow = ::GetFileSize(_handle, &sizeHigh);

   129   if (sizeLow == 0xFFFFFFFF)

   130     if (::GetLastError() != NO_ERROR)

   131       return false;

   132   length = (((UInt64)sizeHigh) << 32) + sizeLow;

   133   return true;

   134 }

   135 

   136 bool CFileBase::Seek(Int64 distanceToMove, DWORD moveMethod, UInt64 &newPosition) const

   137 {

   138   LARGE_INTEGER value;

   139   value.QuadPart = distanceToMove;

   140   value.LowPart = ::SetFilePointer(_handle, value.LowPart, &value.HighPart, moveMethod);

   141   if (value.LowPart == 0xFFFFFFFF)

   142     if (::GetLastError() != NO_ERROR)

   143       return false;

   144   newPosition = value.QuadPart;

   145   return true;

   146 }

   147 

   148 bool CFileBase::Seek(UInt64 position, UInt64 &newPosition)

   149 {

   150   return Seek(position, FILE_BEGIN, newPosition);

   151 }

   152 

   153 bool CFileBase::SeekToBegin()

   154 {

   155   UInt64 newPosition;

   156   return Seek(0, newPosition);

   157 }

   158 

   159 bool CFileBase::SeekToEnd(UInt64 &newPosition)

   160 {

   161   return Seek(0, FILE_END, newPosition);

   162 }

   163 

   164 bool CFileBase::GetFileInformation(CByHandleFileInfo &fileInfo) const

   165 {

   166   BY_HANDLE_FILE_INFORMATION winFileInfo;

   167   if (!::GetFileInformationByHandle(_handle, &winFileInfo))

   168     return false;

   169   fileInfo.Attributes = winFileInfo.dwFileAttributes;

   170   fileInfo.CTime = winFileInfo.ftCreationTime;

   171   fileInfo.ATime = winFileInfo.ftLastAccessTime;

   172   fileInfo.MTime = winFileInfo.ftLastWriteTime;

   173   fileInfo.VolumeSerialNumber = winFileInfo.dwFileAttributes;

   174   fileInfo.Size = (((UInt64)winFileInfo.nFileSizeHigh) << 32) +  winFileInfo.nFileSizeLow;

   175   fileInfo.NumberOfLinks = winFileInfo.nNumberOfLinks;

   176   fileInfo.FileIndex = (((UInt64)winFileInfo.nFileIndexHigh) << 32) + winFileInfo.nFileIndexLow;

   177   return true;

   178 }

   179 

   180 /////////////////////////

   181 // CInFile

   182 

   183 bool CInFile::Open(LPCTSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

   184   { return Create(fileName, GENERIC_READ, shareMode, creationDisposition, flagsAndAttributes); }

   185 

   186 bool CInFile::OpenShared(LPCTSTR fileName, bool shareForWrite)

   187 { return Open(fileName, FILE_SHARE_READ | (shareForWrite ? FILE_SHARE_WRITE : 0), OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL); }

   188 

   189 bool CInFile::Open(LPCTSTR fileName)

   190   { return OpenShared(fileName, false); }

   191 

   192 #ifndef _UNICODE

   193 bool CInFile::Open(LPCWSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

   194   { return Create(fileName, GENERIC_READ, shareMode, creationDisposition, flagsAndAttributes); }

   195 

   196 bool CInFile::OpenShared(LPCWSTR fileName, bool shareForWrite)

   197 { return Open(fileName, FILE_SHARE_READ | (shareForWrite ? FILE_SHARE_WRITE : 0), OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL); }

   198 

   199 bool CInFile::Open(LPCWSTR fileName)

   200   { return OpenShared(fileName, false); }

   201 #endif

   202 

   203 // ReadFile and WriteFile functions in Windows have BUG:

   204 // If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)

   205 // from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES

   206 // (Insufficient system resources exist to complete the requested service).

   207 

   208 // Probably in some version of Windows there are problems with other sizes:

   209 // for 32 MB (maybe also for 16 MB).

   210 // And message can be "Network connection was lost"

   211 

   212 static UInt32 kChunkSizeMax = (1 << 22);

   213 

   214 bool CInFile::ReadPart(void *data, UInt32 size, UInt32 &processedSize)

   215 {

   216   if (size > kChunkSizeMax)

   217     size = kChunkSizeMax;

   218   DWORD processedLoc = 0;

   219   bool res = BOOLToBool(::ReadFile(_handle, data, size, &processedLoc, NULL));

   220   processedSize = (UInt32)processedLoc;

   221   return res;

   222 }

   223 

   224 bool CInFile::Read(void *data, UInt32 size, UInt32 &processedSize)

   225 {

   226   processedSize = 0;

   227   do

   228   {

   229     UInt32 processedLoc = 0;

   230     bool res = ReadPart(data, size, processedLoc);

   231     processedSize += processedLoc;

   232     if (!res)

   233       return false;

   234     if (processedLoc == 0)

   235       return true;

   236     data = (void *)((unsigned char *)data + processedLoc);

   237     size -= processedLoc;

   238   }

   239   while (size > 0);

   240   return true;

   241 }

   242 

   243 /////////////////////////

   244 // COutFile

   245 

   246 bool COutFile::Open(LPCTSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

   247   { return CFileBase::Create(fileName, GENERIC_WRITE, shareMode, creationDisposition, flagsAndAttributes); }

   248 

   249 static inline DWORD GetCreationDisposition(bool createAlways)

   250   { return createAlways? CREATE_ALWAYS: CREATE_NEW; }

   251 

   252 bool COutFile::Open(LPCTSTR fileName, DWORD creationDisposition)

   253   { return Open(fileName, FILE_SHARE_READ, creationDisposition, FILE_ATTRIBUTE_NORMAL); }

   254 

   255 bool COutFile::Create(LPCTSTR fileName, bool createAlways)

   256   { return Open(fileName, GetCreationDisposition(createAlways)); }

   257 

   258 #ifndef _UNICODE

   259 

   260 bool COutFile::Open(LPCWSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)

   261   { return CFileBase::Create(fileName, GENERIC_WRITE, shareMode,      creationDisposition, flagsAndAttributes); }

   262 

   263 bool COutFile::Open(LPCWSTR fileName, DWORD creationDisposition)

   264   { return Open(fileName, FILE_SHARE_READ,  creationDisposition, FILE_ATTRIBUTE_NORMAL); }

   265 

   266 bool COutFile::Create(LPCWSTR fileName, bool createAlways)

   267   { return Open(fileName, GetCreationDisposition(createAlways)); }

   268 

   269 #endif

   270 

   271 bool COutFile::SetTime(const FILETIME *cTime, const FILETIME *aTime, const FILETIME *mTime)

   272   { return BOOLToBool(::SetFileTime(_handle, cTime, aTime, mTime)); }

   273 

   274 bool COutFile::SetMTime(const FILETIME *mTime) {  return SetTime(NULL, NULL, mTime); }

   275 

   276 bool COutFile::WritePart(const void *data, UInt32 size, UInt32 &processedSize)

   277 {

   278   if (size > kChunkSizeMax)

   279     size = kChunkSizeMax;

   280   DWORD processedLoc = 0;

   281   bool res = BOOLToBool(::WriteFile(_handle, data, size, &processedLoc, NULL));

   282   processedSize = (UInt32)processedLoc;

   283   return res;

   284 }

   285 

   286 bool COutFile::Write(const void *data, UInt32 size, UInt32 &processedSize)

   287 {

   288   processedSize = 0;

   289   do

   290   {

   291     UInt32 processedLoc = 0;

   292     bool res = WritePart(data, size, processedLoc);

   293     processedSize += processedLoc;

   294     if (!res)

   295       return false;

   296     if (processedLoc == 0)

   297       return true;

   298     data = (const void *)((const unsigned char *)data + processedLoc);

   299     size -= processedLoc;

   300   }

   301   while (size > 0);

   302   return true;

   303 }

   304 

   305 bool COutFile::SetEndOfFile() { return BOOLToBool(::SetEndOfFile(_handle)); }

   306 

   307 bool COutFile::SetLength(UInt64 length)

   308 {

   309   UInt64 newPosition;

   310   if (!Seek(length, newPosition))

   311     return false;

   312   if (newPosition != length)

   313     return false;

   314   return SetEndOfFile();

   315 }

   316 

   317 }}}
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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