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FileIO.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
FileIO;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TFileIO = class
public
class function ReadAllText(const FileName: String): String;
class procedure WriteAllText(const FileName: String; const Contents: String);
class procedure AppendAllText(const FileName: String; const Contents: String);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
const
BUFFERED_SEQUENTIAL_STREAM_64KB_BUFFER_SIZE = 65536;
BUFFERED_SEQUENTIAL_STREAM_128KB_BUFFER_SIZE = 131072;
BUFFERED_SEQUENTIAL_STREAM_256KB_BUFFER_SIZE = 262144;
BUFFERED_SEQUENTIAL_STREAM_512KB_BUFFER_SIZE = 524288;
BUFFERED_SEQUENTIAL_STREAM_1024KB_BUFFER_SIZE = 1048576;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TBufferedSequentialReadStream = class
public
FileSize: Cardinal;
Position: Cardinal;
private
FileHandle: THandle;
StreamBuffer: Pointer;
StreamBufferSize: Cardinal;
StreamBufferPosition: Cardinal;
StreamBufferBytesRead: Cardinal;
public
constructor Create(const FileName: String; StreamBufferSize: Cardinal);
function Read(var DataBuffer; BytesToRead: Cardinal): Boolean;
function Advance(BytesToAdvance: Cardinal): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TBufferedSequentialWriteStream = class
private
FileHandle: THandle;
StreamBuffer: Pointer;
StreamBufferSize: Cardinal;
StreamBufferPosition: Cardinal;
public
constructor Create(const FileName: String; Append: Boolean; StreamBufferSize: Cardinal);
function Write(const DataBuffer; BytesToWrite: Cardinal): Boolean;
function WriteString(const Text: String; TextLength: Integer): Boolean; overload;
function WriteString(const Text: String): Boolean; overload;
function Flush: Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
SysUtils,
Windows,
MemoryManager;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class function TFileIO.ReadAllText(const FileName: String): String;
var
FileHandle: THandle; BytesToRead: Cardinal; Contents: String; BytesRead: Cardinal;
begin
FileHandle := CreateFile(PChar(FileName), GENERIC_READ, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0); if (FileHandle <> INVALID_HANDLE_VALUE) then begin
try
BytesToRead := GetFileSize(FileHandle, nil); if (BytesToRead > 0) then begin
SetLength(Contents, BytesToRead); ReadFile(FileHandle, Contents[1], BytesToRead, BytesRead, nil); if (BytesRead <> BytesToRead) then begin
raise Exception.Create('Reading from file "' + FileName + '" failed.');
end;
Result := Contents;
end else begin
Result := '';
end;
finally
CloseHandle(FileHandle);
end;
end else begin
raise Exception.Create('Opening file "' + FileName + '" for reading failed.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TFileIO.WriteAllText(const FileName: String; const Contents: String);
var
FileHandle: THandle; BytesToWrite: Cardinal; BytesWritten: Cardinal;
begin
BytesToWrite := Length(Contents); FileHandle := CreateFile(PChar(FileName), GENERIC_WRITE, FILE_SHARE_READ, nil, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); if (FileHandle <> INVALID_HANDLE_VALUE) then begin
try
WriteFile(FileHandle, Contents[1], BytesToWrite, BytesWritten, nil); if (BytesWritten <> BytesToWrite) then begin
raise Exception.Create('Writing to file "' + FileName + '" failed.');
end;
finally
CloseHandle(FileHandle);
end;
end else begin
raise Exception.Create('Opening file "' + FileName + '" for writing failed.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TFileIO.AppendAllText(const FileName: String; const Contents: String);
var
FileHandle: THandle; BytesToWrite: Cardinal; BytesWritten: Cardinal;
begin
BytesToWrite := Length(Contents); FileHandle := CreateFile(PChar(FileName), GENERIC_WRITE, FILE_SHARE_READ, nil, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); if (FileHandle <> INVALID_HANDLE_VALUE) then begin
try
SetFilePointer(FileHandle, 0, nil, FILE_END); WriteFile(FileHandle, Contents[1], BytesToWrite, BytesWritten, nil); if (BytesWritten <> BytesToWrite) then begin
raise Exception.Create('Writing to file "' + FileName + '" failed.');
end;
finally
CloseHandle(FileHandle);
end;
end else begin
raise Exception.Create('Opening file "' + FileName + '" for writing failed.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TBufferedSequentialReadStream.Create(const FileName: String; StreamBufferSize: Cardinal);
begin
Self.StreamBuffer := TMemoryManager.GetMemory(StreamBufferSize); Self.StreamBufferSize := StreamBufferSize;
Self.FileHandle := CreateFile(PChar(FileName), GENERIC_READ, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0); if not(Self.FileHandle <> INVALID_HANDLE_VALUE) then begin
raise Exception.Create('Opening file "' + FileName + '" for reading failed.');
end;
Self.FileSize := GetFileSize(Self.FileHandle, nil);
ReadFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, Self.StreamBufferBytesRead, nil);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialReadStream.Read(var DataBuffer; BytesToRead: Cardinal): Boolean;
var
StreamBufferBytesLeft: Cardinal; BytesLeftToRead: Cardinal;
begin
if (BytesToRead > 0) then begin
StreamBufferBytesLeft := Self.StreamBufferBytesRead - Self.StreamBufferPosition;
if (StreamBufferBytesLeft > 0) then begin
if (BytesToRead > StreamBufferBytesLeft) then begin
Move(Pointer(Cardinal(Self.StreamBuffer) + Self.StreamBufferPosition)^, DataBuffer, StreamBufferBytesLeft); Inc(Self.Position, StreamBufferBytesLeft);
if (Self.StreamBufferBytesRead < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
ReadFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, Self.StreamBufferBytesRead, nil);
if (Self.StreamBufferBytesRead > 0) then begin
BytesLeftToRead := BytesToRead - StreamBufferBytesLeft;
if (BytesLeftToRead > Self.StreamBufferBytesRead) then begin
Move(Self.StreamBuffer^, Pointer(Cardinal(@DataBuffer) + StreamBufferBytesLeft)^, Self.StreamBufferBytesRead); Inc(Self.Position, Self.StreamBufferBytesRead);
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
Move(Self.StreamBuffer^, Pointer(Cardinal(@DataBuffer) + StreamBufferBytesLeft)^, BytesLeftToRead); Inc(Self.Position, BytesLeftToRead);
Self.StreamBufferPosition := BytesLeftToRead;
Result := True;
end;
end else begin
Self.StreamBufferPosition := 0;
Result := False;
end;
end;
end else begin
Move(Pointer(Cardinal(Self.StreamBuffer) + Self.StreamBufferPosition)^, DataBuffer, BytesToRead); Inc(Self.Position, BytesToRead);
Inc(Self.StreamBufferPosition, BytesToRead);
Result := True;
end;
end else begin
if (Self.StreamBufferBytesRead < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := 0;
Result := False;
end else begin
ReadFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, Self.StreamBufferBytesRead, nil);
if (Self.StreamBufferBytesRead > 0) then begin
BytesLeftToRead := BytesToRead;
if (BytesLeftToRead > Self.StreamBufferBytesRead) then begin
Move(Self.StreamBuffer^, DataBuffer, Self.StreamBufferBytesRead); Inc(Self.Position, Self.StreamBufferBytesRead);
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
Move(Self.StreamBuffer^, DataBuffer, BytesLeftToRead); Inc(Self.Position, BytesLeftToRead);
Self.StreamBufferPosition := BytesLeftToRead;
Result := True;
end;
end else begin
Self.StreamBufferPosition := 0;
Result := False;
end;
end;
end;
end else begin
Result := False;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialReadStream.Advance(BytesToAdvance: Cardinal): Boolean;
var
StreamBufferBytesLeft: Cardinal; BytesLeftToAdvance: Cardinal;
begin
if (BytesToAdvance > 0) then begin
StreamBufferBytesLeft := Self.StreamBufferBytesRead - Self.StreamBufferPosition;
if (StreamBufferBytesLeft > 0) then begin
if (BytesToAdvance > StreamBufferBytesLeft) then begin
Inc(Self.Position, StreamBufferBytesLeft);
if (Self.StreamBufferBytesRead < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
ReadFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, Self.StreamBufferBytesRead, nil);
if (Self.StreamBufferBytesRead > 0) then begin
BytesLeftToAdvance := BytesToAdvance - StreamBufferBytesLeft;
if (BytesLeftToAdvance > Self.StreamBufferBytesRead) then begin
Inc(Self.Position, Self.StreamBufferBytesRead);
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
Inc(Self.Position, BytesLeftToAdvance);
Self.StreamBufferPosition := BytesLeftToAdvance;
Result := True;
end;
end else begin
Self.StreamBufferPosition := 0;
Result := False;
end;
end;
end else begin
Inc(Self.Position, BytesToAdvance);
Inc(Self.StreamBufferPosition, BytesToAdvance);
Result := True;
end;
end else begin
if (Self.StreamBufferBytesRead < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := 0;
Result := False;
end else begin
ReadFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, Self.StreamBufferBytesRead, nil);
if (Self.StreamBufferBytesRead > 0) then begin
BytesLeftToAdvance := BytesToAdvance;
if (BytesLeftToAdvance > Self.StreamBufferBytesRead) then begin
Inc(Self.Position, Self.StreamBufferBytesRead);
Self.StreamBufferPosition := Self.StreamBufferBytesRead;
Result := False;
end else begin
Inc(Self.Position, BytesLeftToAdvance);
Self.StreamBufferPosition := BytesLeftToAdvance;
Result := True;
end;
end else begin
Self.StreamBufferPosition := 0;
Result := False;
end;
end;
end;
end else begin
Result := False;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TBufferedSequentialReadStream.Destroy;
begin
if (Self.FileHandle <> INVALID_HANDLE_VALUE) then CloseHandle(Self.FileHandle);
TMemoryManager.FreeMemory(Self.StreamBuffer, Self.StreamBufferSize);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TBufferedSequentialWriteStream.Create(const FileName: String; Append: Boolean; StreamBufferSize: Cardinal);
begin
Self.StreamBuffer := TMemoryManager.GetMemory(StreamBufferSize); Self.StreamBufferSize := StreamBufferSize;
if Append then begin
Self.FileHandle := CreateFile(PChar(FileName), GENERIC_WRITE, FILE_SHARE_READ, nil, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); if not(Self.FileHandle <> INVALID_HANDLE_VALUE) then begin
raise Exception.Create('Opening file "' + FileName + '" for writing failed.');
end;
SetFilePointer(Self.FileHandle, 0, nil, FILE_END);
end else begin
Self.FileHandle := CreateFile(PChar(FileName), GENERIC_WRITE, FILE_SHARE_READ, nil, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); if not(Self.FileHandle <> INVALID_HANDLE_VALUE) then begin
raise Exception.Create('Opening file "' + FileName + '" for writing failed.');
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialWriteStream.Write(const DataBuffer; BytesToWrite: Cardinal): Boolean;
var
StreamBufferBytesLeft: Cardinal; BytesWritten: Cardinal; BytesLeftToWrite: Cardinal;
begin
StreamBufferBytesLeft := Self.StreamBufferSize - Self.StreamBufferPosition;
if (StreamBufferBytesLeft > 0) then begin
if (BytesToWrite > StreamBufferBytesLeft) then begin
Move(DataBuffer, Pointer(Cardinal(Self.StreamBuffer) + Self.StreamBufferPosition)^, StreamBufferBytesLeft);
WriteFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, BytesWritten, nil);
if (BytesWritten < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := Self.StreamBufferSize;
Result := False;
Exit;
end;
BytesLeftToWrite := BytesToWrite - StreamBufferBytesLeft;
Move(Pointer(Cardinal(@DataBuffer) + StreamBufferBytesLeft)^, Self.StreamBuffer^, BytesLeftToWrite);
Self.StreamBufferPosition := BytesLeftToWrite;
end else begin
Move(DataBuffer, Pointer(Cardinal(Self.StreamBuffer) + Self.StreamBufferPosition)^, BytesToWrite);
Inc(Self.StreamBufferPosition, BytesToWrite);
end;
end else begin
WriteFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferSize, BytesWritten, nil);
if (BytesWritten < Self.StreamBufferSize) then begin
Self.StreamBufferPosition := Self.StreamBufferSize;
Result := False;
Exit;
end;
Move(DataBuffer, Self.StreamBuffer^, BytesToWrite);
Self.StreamBufferPosition := BytesToWrite;
end;
Result := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialWriteStream.WriteString(const Text: String; TextLength: Integer): Boolean;
begin
Result := Self.Write(Text[1], TextLength);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialWriteStream.WriteString(const Text: String): Boolean;
begin
Result := Self.Write(Text[1], Length(Text));
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TBufferedSequentialWriteStream.Flush: Boolean;
var
BytesWritten: Cardinal;
begin
if (Self.StreamBufferPosition > 0) then begin
WriteFile(Self.FileHandle, Self.StreamBuffer^, Self.StreamBufferPosition, BytesWritten, nil);
if (BytesWritten < Self.StreamBufferPosition) then begin
Result := False;
Exit;
end;
end;
Result := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TBufferedSequentialWriteStream.Destroy;
begin
if (Self.FileHandle <> INVALID_HANDLE_VALUE) then CloseHandle(Self.FileHandle);
TMemoryManager.FreeMemory(Self.StreamBuffer, Self.StreamBufferSize);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
end.