public void SetFileLength(Base file, long value)
{
if (file == null)
{
throw new ArgumentNullException(nameof(file));
}
FatHelpers.Debug("File.Name:");
FatHelpers.Debug(file.Name);
var xIsFile = file is FatFile;
var xIsDirectory = !xIsFile;
using (var xDirectoryContents = new FatDirectoryStream((FatDirectory)file.BaseDirectory))
{
FatHelpers.Debug("--SetFileLength");
FatHelpers.DebugNumber((uint)xDirectoryContents.Length);
//TODO: Change xLongName to StringBuilder
string xLongName = "";
string xName = "";
var xBuff = new byte[32];
while (xDirectoryContents.Position < xDirectoryContents.Length)
{
if (xDirectoryContents.Read(xBuff, 0, 32) != 32)
{
throw new Exception("Unable to read 32 bytes from stream!");
}
FatHelpers.DevDebug("-------------------------------------------------");
byte xAttrib = xBuff[11];
byte xStatus = xBuff[0];
FatHelpers.DevDebug("Attrib = " + xAttrib.ToString() + ", Status = " + xStatus);
if (xAttrib == DirectoryEntryAttributeConsts.LongName)
{
byte xType = xBuff[12];
byte xOrd = xBuff[0];
FatHelpers.DevDebug("Reading LFN with Seqnr " + xOrd.ToString() + ", Type = " + xType);
if (xOrd == 0xE5)
{
FatHelpers.DevDebug("Skipping deleted entry");
continue;
}
if (xType == 0)
{
if ((xOrd & 0x40) > 0)
{
xLongName = "";
}
//TODO: Check LDIR_Ord for ordering and throw exception
// if entries are found out of order.
// Also save buffer and only copy name if a end Ord marker is found.
string xLongPart = xBuff.GetUtf16String(0 + 1, 5);
// We have to check the length because 0xFFFF is a valid Unicode codepoint.
// So we only want to stop if the 0xFFFF is AFTER a 0x0000. We can determin
// this by also looking at the length. Since we short circuit the or, the length
// is rarely evaluated.
if (xBuff.ToUInt16(0 + 14) != 0xFFFF || xLongPart.Length == 5)
{
xLongPart = xLongPart + xBuff.GetUtf16String(0 + 14, 6);
if (xBuff.ToUInt16(0 + 28) != 0xFFFF || xLongPart.Length == 11)
{
xLongPart = xLongPart + xBuff.GetUtf16String(0 + 28, 2);
}
}
xLongName = xLongPart + xLongName;
xLongPart = null;
//TODO: LDIR_Chksum
}
}
else
{
xName = xLongName;
if (xStatus == 0x00)
{
// Empty slot, and no more entries after this
break;
}
else if (xStatus == 0x05)
{
// Japanese characters - We dont handle these
}
else if (xStatus == 0xE5)
{
// Empty slot, skip it
}
else if (xStatus >= 0x20)
{
if (xLongName.Length > 0)
{
// Leading and trailing spaces are to be ignored according to spec.
// Many programs (including Windows) pad trailing spaces although it
// it is not required for long names.
// As per spec, ignore trailing periods
xName = xLongName.Trim();
//If there are trailing periods
int nameIndex = xName.Length - 1;
if (xName[nameIndex] == '.')
{
//Search backwards till we find the first non-period character
for (; nameIndex > 0; nameIndex--)
{
if (xName[nameIndex] != '.')
{
break;
}
}
//Substring to remove the periods
xName = xName.Substring(0, nameIndex + 1);
}
xLongName = "";
}
else
{
string xEntry = xBuff.GetAsciiString(0, 11);
xName = xEntry.Substring(0, 8).TrimEnd();
string xExt = xEntry.Substring(8, 3).TrimEnd();
if (xExt.Length > 0)
{
xName = xName + "." + xExt;
}
}
}
}
UInt32 xFirstCluster = (UInt32)(xBuff.ToUInt16(0 + 20) << 16 | xBuff.ToUInt16(0 + 26));
var xTest = xAttrib & (DirectoryEntryAttributeConsts.Directory | DirectoryEntryAttributeConsts.VolumeID);
if (xAttrib == DirectoryEntryAttributeConsts.LongName)
{
// skip adding, as it's a LongFileName entry, meaning the next normal entry is the item with the name.
FatHelpers.Debug("Entry was an Long FileName entry. Current LongName = '" + xLongName + "'");
}
else if (xTest == 0)
{
if (xIsFile && String.Equals(file.Name, xName, StringComparison.OrdinalIgnoreCase))
{
// found, now update size and write back
xBuff.SetUInt32(28, (uint)value);
xDirectoryContents.Position -= 32;
xDirectoryContents.Write(xBuff, 0, 32);
FatHelpers.Debug("--- File size changed!");
return;
}
}
else if (xTest == DirectoryEntryAttributeConsts.Directory)
{
if (xIsDirectory && String.Equals(file.Name, xName, StringComparison.OrdinalIgnoreCase))
{
xBuff.SetUInt32(28, (uint)value);
xDirectoryContents.Position -= 32;
xDirectoryContents.Write(xBuff, 0, 32);
FatHelpers.Debug("--- Directory size changed!");
return;
}
}
else if (xTest == DirectoryEntryAttributeConsts.VolumeID)
{
FatHelpers.DevDebug("Directory entry is VolumeID");
//
}
else
{
FatHelpers.DevDebug("Not sure what to do!");
}
}
}
throw new Exception("Unable to find the file entry!");
}
private List <Base> GetDirectoryContents(FatDirectory directory, Stream directoryContents)
{
if (directory == null)
{
throw new ArgumentNullException("directory");
}
FatHelpers.Debug("--GetDirectoryContents");
if (directoryContents == null)
{
FatHelpers.Debug("No Stream specified!");
}
else
{
FatHelpers.Debug("Stream specified.");
}
var xResult = new List <Base>();
//TODO: Change xLongName to StringBuilder
string xLongName = "";
string xName = "";
var xBuff = new byte[32];
FatHelpers.Debug("Stream.Position");
FatHelpers.DebugNumber((uint)directoryContents.Position);
FatHelpers.Debug("Stream.Length");
FatHelpers.DebugNumber((uint)directoryContents.Length);
if (directoryContents.Position < directoryContents.Length)
{
FatHelpers.Debug("Data to read!");
}
else
{
FatHelpers.Debug("No data to read!");
}
while (directoryContents.Position < directoryContents.Length)
{
if (directoryContents.Read(xBuff, 0, 32) != 32)
{
FatHelpers.Debug("Not enough data read!");
throw new Exception("Unable to read 32 bytes from stream!");
}
FatHelpers.Debug("No data read");
FatHelpers.DevDebug("-------------------------------------------------");
byte xAttrib = xBuff[11];
byte xStatus = xBuff[0];
FatHelpers.DevDebug("Attrib = " + xAttrib.ToString() + ", Status = " + xStatus);
if (xAttrib == DirectoryEntryAttributeConsts.LongName)
{
byte xType = xBuff[12];
byte xOrd = xBuff[0];
FatHelpers.DevDebug("Reading LFN with Seqnr " + xOrd.ToString() + ", Type = " + xType);
if (xOrd == 0xE5)
{
FatHelpers.DevDebug("Skipping deleted entry");
continue;
}
if (xType == 0)
{
if ((xOrd & 0x40) > 0)
{
xLongName = "";
}
//TODO: Check LDIR_Ord for ordering and throw exception
// if entries are found out of order.
// Also save buffer and only copy name if a end Ord marker is found.
string xLongPart = xBuff.GetUtf16String(0 + 1, 5);
// We have to check the length because 0xFFFF is a valid Unicode codepoint.
// So we only want to stop if the 0xFFFF is AFTER a 0x0000. We can determin
// this by also looking at the length. Since we short circuit the or, the length
// is rarely evaluated.
if (xBuff.ToUInt16(0 + 14) != 0xFFFF || xLongPart.Length == 5)
{
xLongPart = xLongPart + xBuff.GetUtf16String(0 + 14, 6);
if (xBuff.ToUInt16(0 + 28) != 0xFFFF || xLongPart.Length == 11)
{
xLongPart = xLongPart + xBuff.GetUtf16String(0 + 28, 2);
}
}
xLongName = xLongPart + xLongName;
xLongPart = null;
//TODO: LDIR_Chksum
}
}
else
{
xName = xLongName;
if (xStatus == 0x00)
{
// Empty slot, and no more entries after this
break;
}
else if (xStatus == 0x05)
{
// Japanese characters - We dont handle these
}
else if (xStatus == 0xE5)
{
// Empty slot, skip it
}
else if (xStatus >= 0x20)
{
if (xLongName.Length > 0)
{
// Leading and trailing spaces are to be ignored according to spec.
// Many programs (including Windows) pad trailing spaces although it
// it is not required for long names.
// As per spec, ignore trailing periods
xName = xLongName.Trim();
//If there are trailing periods
int nameIndex = xName.Length - 1;
if (xName[nameIndex] == '.')
{
//Search backwards till we find the first non-period character
for (; nameIndex > 0; nameIndex--)
{
if (xName[nameIndex] != '.')
{
break;
}
}
//Substring to remove the periods
xName = xName.Substring(0, nameIndex + 1);
}
xLongName = "";
}
else
{
string xEntry = xBuff.GetAsciiString(0, 11);
xName = xEntry.Substring(0, 8).TrimEnd();
string xExt = xEntry.Substring(8, 3).TrimEnd();
if (xExt.Length > 0)
{
xName = xName + "." + xExt;
}
}
}
}
UInt32 xFirstCluster = (UInt32)(xBuff.ToUInt16(0 + 20) << 16 | xBuff.ToUInt16(0 + 26));
var xTest = xAttrib & (DirectoryEntryAttributeConsts.Directory | DirectoryEntryAttributeConsts.VolumeID);
if (xAttrib == DirectoryEntryAttributeConsts.LongName)
{
// skip adding, as it's a LongFileName entry, meaning the next normal entry is the item with the name.
FatHelpers.Debug("Entry was an Long FileName entry. Current LongName = '" + xLongName + "'");
}
else if (xTest == 0)
{
UInt32 xSize = xBuff.ToUInt32(0 + 28);
if (xSize == 0 && xName.Length == 0)
{
continue;
}
xResult.Add(new FatFile(this, xName, xSize, xFirstCluster, directory));
FatHelpers.Debug("Returning file '" + xName + "'");
}
else if (xTest == DirectoryEntryAttributeConsts.Directory)
{
UInt32 xSize = xBuff.ToUInt32(0 + 28);
var xFatDirectory = new FatDirectory(this, xName, xFirstCluster, directory, xSize);
FatHelpers.Debug("Returning directory '" + xFatDirectory.Name + "', FirstCluster = " + xFirstCluster);
xResult.Add(xFatDirectory);
}
else if (xTest == DirectoryEntryAttributeConsts.VolumeID)
{
FatHelpers.DevDebug("Directory entry is VolumeID");
//
}
else
{
FatHelpers.DevDebug("Not sure what to do!");
}
}
return(xResult);
}
