public SimplifiedSubFileStreamIoSession(FileStream stream, SubFileHeader subFile, FileHeaderBlock header)
{
if (stream is null)
{
throw new ArgumentNullException("stream");
}
if (subFile is null)
{
throw new ArgumentNullException("subFile");
}
if (header is null)
{
throw new ArgumentNullException("header");
}
if (subFile.DirectBlock == 0)
{
throw new Exception("Must assign subFile.DirectBlock");
}
m_stream = stream;
m_header = header;
m_blockSize = header.BlockSize;
m_subFile = subFile;
m_memory = new Memory(m_blockSize);
m_buffer = new byte[m_blockSize];
m_currentPhysicalBlock = -1;
m_blockDataLength = m_blockSize - FileStructureConstants.BlockFooterLength;
}
/// <summary>
/// Creates an SimplifiedSubFileStream
/// </summary>
/// <param name="stream">The location to read from.</param>
/// <param name="subFile">The file to read.</param>
/// <param name="fileHeaderBlock">The FileAllocationTable</param>
internal SimplifiedSubFileStream(FileStream stream, SubFileHeader subFile, FileHeaderBlock fileHeaderBlock)
{
if (stream is null)
{
throw new ArgumentNullException("stream");
}
if (subFile is null)
{
throw new ArgumentNullException("subFile");
}
if (fileHeaderBlock is null)
{
throw new ArgumentNullException("fileHeaderBlock");
}
if (subFile.DirectBlock == 0)
{
throw new Exception("Must assign subFile.DirectBlock");
}
if (fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "fileHeaderBlock");
}
if (subFile.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "subFile");
}
m_blockSize = fileHeaderBlock.BlockSize;
m_stream = stream;
m_subFile = subFile;
m_fileHeaderBlock = fileHeaderBlock;
}
/// <summary>
/// Creates a new instance of this class.
/// </summary>
/// <param name="ioSessions">IoSessions to use to read from this disk</param>
public IndexParser(SubFileDiskIoSessionPool ioSessions)
: base(ioSessions.Header.BlockSize)
{
m_subFile = ioSessions.File;
m_ioSessions = ioSessions;
m_oldFirstOffset = -1;
}
/// <summary>
/// Creates a new file on the file system and returns the <see cref="SubFileHeader"/> associated with the new file.
/// </summary>
/// <param name="fileName">Represents the nature of the data that will be stored in this file.</param>
/// <returns></returns>
/// <remarks>A file system only supports 64 files. This is a fundamental limitation and cannot be changed easily.</remarks>
public SubFileHeader CreateNewFile(SubFileName fileName)
{
base.TestForEditable();
if (!CanWrite)
{
throw new Exception("Writing to this file type is not supported");
}
if (IsReadOnly)
{
throw new Exception("File is read only");
}
if (m_files.Count >= 64)
{
throw new OverflowException("Only 64 files per file system is supported");
}
if (ContainsSubFile(fileName))
{
throw new DuplicateNameException("Name already exists");
}
SubFileHeader node = new SubFileHeader(m_nextFileId, fileName, isImmutable: false, isSimplified: IsSimplifiedFileFormat);
m_nextFileId++;
m_files.Add(node);
return(node);
}
/// <summary>
/// Opens a ArchiveFileStream that can be used to read/write to the file passed to this function.
/// </summary>
/// <returns></returns>
public SubFileStream OpenFile(SubFileName fileName)
{
for (int x = 0; x < m_fileHeaderBlock.Files.Count; x++)
{
SubFileHeader file = m_fileHeaderBlock.Files[x];
if (file.FileName == fileName)
{
return(OpenFile(x));
}
}
throw new Exception("File does not exist");
}
/// <summary>
/// Creates this file with the following data.
/// </summary>
/// <param name="diskIo"></param>
/// <param name="header"></param>
/// <param name="file"></param>
/// <param name="isReadOnly"></param>
public SubFileDiskIoSessionPool(DiskIo diskIo, FileHeaderBlock header, SubFileHeader file, bool isReadOnly)
{
LastReadonlyBlock = diskIo.LastCommittedHeader.LastAllocatedBlock;
File = file;
Header = header;
IsReadOnly = isReadOnly;
SourceData = diskIo.CreateDiskIoSession(header, file);
SourceIndex = diskIo.CreateDiskIoSession(header, file);
if (!isReadOnly)
{
DestinationData = diskIo.CreateDiskIoSession(header, file);
DestinationIndex = diskIo.CreateDiskIoSession(header, file);
}
}
/// <summary>
/// Creates and Opens a new file on the current file system.
/// </summary>
/// <returns></returns>
public ISupportsBinaryStream CreateFile(SubFileName fileName)
{
if (m_disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
CloseCurrentFile();
SubFileHeader subFile = m_fileHeaderBlock.CreateNewFile(fileName);
subFile.DirectBlock = m_fileHeaderBlock.LastAllocatedBlock + 1;
m_subFileStream = new SimplifiedSubFileStream(m_stream, subFile, m_fileHeaderBlock);
return(m_subFileStream);
}
/// <summary>
/// Creates an SubFileStream
/// </summary>
/// <param name="dataReader">The location to read from.</param>
/// <param name="subFile">The file to read.</param>
/// <param name="fileHeaderBlock">The FileAllocationTable</param>
/// <param name="isReadOnly">Determines if the stream allows editing.</param>
internal SubFileStream(DiskIo dataReader, SubFileHeader subFile, FileHeaderBlock fileHeaderBlock, bool isReadOnly)
{
if (dataReader == null)
{
throw new ArgumentNullException("dataReader");
}
if (subFile == null)
{
throw new ArgumentNullException("subFile");
}
if (fileHeaderBlock == null)
{
throw new ArgumentNullException("subFile");
}
if (!isReadOnly)
{
if (dataReader.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "dataReader");
}
if (fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "fileHeaderBlock");
}
if (subFile.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "subFile");
}
}
if (isReadOnly)
{
if (!fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter must be read only when opening for reading", "fileHeaderBlock");
}
if (!subFile.IsReadOnly)
{
throw new ArgumentException("This parameter must be read only when opening for reading", "subFile");
}
}
m_blockSize = dataReader.BlockSize;
m_dataReader = dataReader;
m_subFile = subFile;
m_fileHeaderBlock = fileHeaderBlock;
m_isReadOnly = isReadOnly;
}
/// <summary>
/// Creates a <see cref="ShadowCopyAllocator"/> that is used make shadow copies of blocks.
/// </summary>
/// <param name="ioSessions"></param>
public ShadowCopyAllocator(SubFileDiskIoSessionPool ioSessions)
: base(ioSessions)
{
if (ioSessions == null)
{
throw new ArgumentNullException("ioSessions");
}
if (ioSessions.IsReadOnly)
{
throw new ArgumentException("DataReader is read only", "ioSessions");
}
m_lastReadOnlyBlock = ioSessions.LastReadonlyBlock;
m_fileHeaderBlock = ioSessions.Header;
m_subFileHeader = ioSessions.File;
m_ioSessions = ioSessions;
}
/// <summary>
/// Opens a ArchiveFileStream that can be used to read/write to the file passed to this function.
/// </summary>
/// <returns></returns>
public SubFileStream OpenFile(SubFileName fileName)
{
if (m_disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
for (int x = 0; x < Files.Count; x++)
{
SubFileHeader file = Files[x];
if (file.FileName == fileName)
{
return(OpenFile(x));
}
}
throw new Exception("File does not exist");
}
/// <summary>
/// Opens a ArchiveFileStream that can be used to read/write to the file passed to this function.
/// </summary>
/// <param name="fileIndex">The index of the file to open.</param>
/// <returns></returns>
public SubFileStream OpenFile(int fileIndex)
{
if (m_disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (fileIndex < 0 || fileIndex >= m_fileHeaderBlock.Files.Count)
{
throw new ArgumentOutOfRangeException("fileIndex", "The file index provided could not be found in the header.");
}
SubFileHeader subFile = m_fileHeaderBlock.Files[fileIndex];
SubFileStream fileStream = new SubFileStream(m_dataReader, subFile, m_fileHeaderBlock, isReadOnly: false);
m_openedFiles.Add(fileStream);
return(fileStream);
}
