public MDXFile(string dbfFile, ZipHelper _ziphelper, char DirSeperator, bool ReadOnly)
{
this.boolReadOnly = ReadOnly;
this.objMDXEntrys = new List<MDX>(MAX_TAGS);
short i;
this.strName = Path.GetDirectoryName(dbfFile) + DirSeperator + Path.GetFileNameWithoutExtension(dbfFile) + ".mdx";
if (_ziphelper.FileExists(this.strName))
{
BinaryReader mdxReader = null;
try
{
byte[] buffer;
GCHandle handle;
this.objFileStream = _ziphelper.GetReadStream(this.strName);
//Create a Binary Reader for the MDX file
mdxReader = new BinaryReader(objFileStream);
byte[] completeBuffer = mdxReader.ReadBytes((int) _ziphelper.GetStreamLength(this.strName, objFileStream));
mdxReader.Close();
mdxReader = new BinaryReader(new MemoryStream(completeBuffer), ASCIIEncoding.ASCII);
// Marshall the header into a MDXHeader structure
buffer = mdxReader.ReadBytes(Marshal.SizeOf(typeof (MDXHeader)));
handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.objHeader = (MDXHeader) Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof (MDXHeader));
handle.Free();
//Read the Key Nodes
for (i = 0; i < objHeader.numberOfTagsInUse; i++)
{
int StreamStartPosition = Marshal.SizeOf(typeof (MDXHeader));
StreamStartPosition += (this.objHeader.lengthOfTag*i);
if (i < objHeader.numberOfTagsInUse)
{
MDX newMDX = new MDX(i);
this.objMDXEntrys.Add(newMDX);
newMDX.Read(mdxReader, this.objHeader.lengthOfTag, StreamStartPosition);
}
else
{
objMDXEntrys.Add(null);
}
}
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
}
finally
{
mdxReader.Close();
}
}
}
public static DataTable ReadDBF(string dbfFile, ZipHelper ziphelper, char dirSeperator)
{
long start = DateTime.Now.Ticks;
var dt = new DataTable();
// If there isn't even a file, just return an empty DataTable
if ((false == ziphelper.FileExists(dbfFile)))
{
return dt;
}
OpenMemoFile(dbfFile, ziphelper, dirSeperator);
ReadMdxFile(dbfFile, ziphelper, dirSeperator);
//Dictionary<int, byte[]> memoLookup = ReadDBT(dbfFile);
try
{
// Read the header into a buffer
using (Stream tmpStream = ziphelper.GetReadStream(dbfFile))
{
//BinaryReader zipbr = new BinaryReader(tmpStream);
using (var br = new BinaryReader(tmpStream))
{
DBFHeader header = ReadDBFHeader(br);
// Read in all the field descriptors. Per the spec, 13 (0D) marks the end of the field descriptors
ArrayList fields = ReadDBFFields(br);
dt = FillColumnsInDataTable(dt, br, header, fields);
// Skip past the end of the header.
(br.BaseStream).Seek(header.headerLen, SeekOrigin.Begin);
// Read in all the records
for (int counter = 0; counter <= header.numRecords - 1; counter++)
{
// First we'll read the entire record into a buffer and then read each field from the buffer
// This helps account for any extra space at the end of each record and probably performs better
byte[] buffer = br.ReadBytes(header.recordLen);
using (var recReader = new BinaryReader(new MemoryStream(buffer)))
{
FillRow(ref dt, fields, recReader);
}
}
}
}
}
catch
{
throw;
}
finally
{
if (dbtReader != null)
{
dbtReader.Close();
dbtReader = null;
}
}
long count = DateTime.Now.Ticks - start;
return dt;
}
/// <summary>
/// This Function Writes directly to a DBF File.
/// It reads the Field list, and writes to the correct position.
/// To access the deleted flag, use DELETED_FLAG as column Name
/// </summary>
/// <param name="dbfFile"></param>
/// <param name="column"></param>
/// <param name="row"></param>
/// <param name="value"></param>
/// <param name="ziphelper"></param>
/// <param name="dirSeperator"></param>
/// <returns></returns>
public static bool WriteValue(string dbfFile, string column, int row, object value, ZipHelper ziphelper, char dirSeperator)
{
//if (zipfile != null)
// throw new Exception("Write to Zipped Files is not supported!");
int bytesToRecordStart = 0;
long start = DateTime.Now.Ticks;
// If there isn't even a file, just return an empty DataTable
if ((false == ziphelper.FileExists(dbfFile)))
{
return false;
}
BinaryReader br = null;
BinaryWriter bw = null;
try
{
// Read the header into a buffer
Stream tmpStream = ziphelper.GetReadStream(dbfFile);
br = new BinaryReader(tmpStream);
byte[] completeBuffer = br.ReadBytes((int)ziphelper.GetStreamLength(dbfFile, tmpStream));
tmpStream.Close();
br.Close();
br = new BinaryReader(new MemoryStream(completeBuffer));
byte[] buffer = br.ReadBytes(Marshal.SizeOf(typeof(DBFHeader)));
// Marshall the header into a DBFHeader structure
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
DBFHeader header = (DBFHeader)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(DBFHeader));
handle.Free();
// Read in all the field descriptors. Per the spec, 13 (0D) marks the end of the field descriptors
ArrayList fields = new ArrayList();
while ((13 != br.PeekChar()))
{
buffer = br.ReadBytes(Marshal.SizeOf(typeof(FieldDescriptor)));
handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
fields.Add((FieldDescriptor)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(FieldDescriptor)));
handle.Free();
}
char writeFieldType = ' ';
int writeFieldLength = 0;
foreach (FieldDescriptor field in fields)
{
writeFieldType = (char)field.fieldType;
writeFieldLength = field.fieldLen;
if (field.fieldName == column)
break;
bytesToRecordStart += field.fieldLen;
}
br.Close();
Stream strm = ziphelper.GetWriteStream(dbfFile);
bw = new BinaryWriter(strm);
if (column != "DELETED_FLAG")
bytesToRecordStart++;
else
bytesToRecordStart = 0;
(/*(FileStream)*/ bw.BaseStream).Seek(header.headerLen + row*header.recordLen + bytesToRecordStart, SeekOrigin.Begin);
if (column == "DELETED_FLAG")
bw.Write((bool) value ? Encoding.ASCII.GetBytes("*") : Encoding.ASCII.GetBytes(" "));
else
{
/*
number = Encoding.ASCII.GetString(recReader.ReadBytes(field.fieldLen));
switch (field.fieldType)
{
case (byte)'N':
if (number.IndexOf(".") > -1)
{
col = new DataColumn(field.fieldName, typeof(decimal));
}
else
{
col = new DataColumn(field.fieldName, typeof(int));
}
break;
case (byte)'C':
col = new DataColumn(field.fieldName, typeof(string));
break;
case (byte)'T':
// You can uncomment this to see the time component in the grid
//col = new DataColumn(field.fieldName, typeof(string));
col = new DataColumn(field.fieldName, typeof(DateTime));
break;
case (byte)'D':
col = new DataColumn(field.fieldName, typeof(DateTime));
break;
case (byte)'L':
col = new DataColumn(field.fieldName, typeof(bool));
break;
case (byte)'F':
col = new DataColumn(field.fieldName, typeof(Double));
break;
case (byte)'M':
//Field Type Memo...
col = new DataColumn(field.fieldName, typeof(byte[]));
//col = new DataColumn(field.fieldName, typeof(string));
break;
}*/
switch (writeFieldType)
{
case 'N':
bw.Write(Encoding.ASCII.GetBytes(value.ToString().PadLeft(writeFieldLength, ' ')));
break;
case 'C':
bw.Write(Encoding.ASCII.GetBytes(value.ToString().PadRight(writeFieldLength, ' ')));
break;
default:
//br.Close();
return false;
}
}
ziphelper.WriteBackStream(dbfFile, strm);
bw.Close();
}
finally
{
if (br != null)
br.Close();
if (bw != null)
bw.Close();
}
return true;
}
private static void OpenMemoFile(string dbfFile, ZipHelper ziphelper, char dirSeperator)
{
string dbtFile = Path.GetDirectoryName(dbfFile) + dirSeperator + Path.GetFileNameWithoutExtension(dbfFile) + ".dbt";
if (ziphelper.FileExists(dbtFile))
{
dbtReader = null;
try
{
//dbtReader = new BinaryReader(new FileStream(dbtFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
//dbtReader=new BinaryReader(ZipHelper.GetReadStream(zipfile, dbtFile));
Stream tmpStream = ziphelper.GetReadStream(dbtFile);
dbtReader = new BinaryReader(tmpStream);
byte[] completeBuffer = dbtReader.ReadBytes((int)ziphelper.GetStreamLength(dbtFile, tmpStream));
dbtReader.Close();
dbtReader = new BinaryReader(new MemoryStream(completeBuffer));
// Read the header into a buffer
byte[] buffer = dbtReader.ReadBytes(Marshal.SizeOf(typeof(DBTHeader)));
// Marshall the header into a DBTHeader structure
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
DBTHeader header = (DBTHeader) Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof (DBTHeader));
handle.Free();
memoBlockLength = header.blockLength;
}
catch(Exception)
{
throw;
}
}
}
public static DataTable ReadDBF(string dbfFile, ZipHelper _ziphelper, char DirSeperator)
{
long start = DateTime.Now.Ticks;
DataTable dt = new DataTable();
BinaryReader recReader;
DataRow row;
int fieldIndex;
// If there isn't even a file, just return an empty DataTable
if ((false == _ziphelper.FileExists(dbfFile)))
{
return dt;
}
BinaryReader br = null;
openMemoFile(dbfFile, _ziphelper, DirSeperator);
readMDXFile(dbfFile, _ziphelper, DirSeperator);
//Dictionary<int, byte[]> memoLookup = ReadDBT(dbfFile);
try
{
// Read the header into a buffer
//br = new BinaryReader(new FileStream(dbfFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
Stream tmpStream = _ziphelper.GetReadStream(dbfFile);
br = new BinaryReader(tmpStream);
byte[] completeBuffer = br.ReadBytes((int)_ziphelper.GetStreamLength(dbfFile, tmpStream));
tmpStream.Close();
br.Close();
br = new BinaryReader(new MemoryStream(completeBuffer));
byte[] buffer = br.ReadBytes(Marshal.SizeOf(typeof(DBFHeader)));
// Marshall the header into a DBFHeader structure
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
DBFHeader header = (DBFHeader)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(DBFHeader));
handle.Free();
// Read in all the field descriptors. Per the spec, 13 (0D) marks the end of the field descriptors
ArrayList fields = new ArrayList();
while ((13 != br.PeekChar()))
{
buffer = br.ReadBytes(Marshal.SizeOf(typeof(FieldDescriptor)));
handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
fields.Add((FieldDescriptor)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(FieldDescriptor)));
handle.Free();
}
// Read in the first row of records, we need this to help determine column types below
(br.BaseStream).Seek(header.headerLen + 1, SeekOrigin.Begin);
buffer = br.ReadBytes(header.recordLen);
recReader = new BinaryReader(new MemoryStream(buffer));
// Create the columns in our new DataTable
DataColumn col = null;
dt.Columns.Add(new DataColumn("DELETED_FLAG", typeof(bool)));
foreach (FieldDescriptor field in fields)
{
byte[] NumberByteArray = recReader.ReadBytes(field.fieldLen);
switch (field.fieldType)
{
case dBaseType.N:
if (dBaseConverter.N_IsDecimal(NumberByteArray)){
col = new DataColumn(field.fieldName, typeof(decimal));
}else{
col = new DataColumn(field.fieldName, typeof(int));
}
break;
case dBaseType.C:
col = new DataColumn(field.fieldName, typeof(string));
break;
case dBaseType.T:
col = new DataColumn(field.fieldName, typeof(DateTime));
break;
case dBaseType.D:
col = new DataColumn(field.fieldName, typeof(DateTime));
break;
case dBaseType.L:
col = new DataColumn(field.fieldName, typeof(bool));
break;
case dBaseType.F:
col = new DataColumn(field.fieldName, typeof(Double));
break;
case dBaseType.M:
//Field Type Memo...
col = new DataColumn(field.fieldName, typeof(byte[]));
break;
}
dt.Columns.Add(col);
}
// Skip past the end of the header.
(br.BaseStream).Seek(header.headerLen, SeekOrigin.Begin);
// Read in all the records
for (int counter = 0; counter <= header.numRecords - 1; counter++)
{
// First we'll read the entire record into a buffer and then read each field from the buffer
// This helps account for any extra space at the end of each record and probably performs better
buffer = br.ReadBytes(header.recordLen);
recReader = new BinaryReader(new MemoryStream(buffer));
// All dbf field records begin with a deleted flag field. Deleted - 0x2A (asterisk) else 0x20 (space)
//if (recReader.ReadChar() == '*')
//{
// continue;
//}
// Loop through each field in a record
fieldIndex = 0;
row = dt.NewRow();
char delflg = recReader.ReadChar();
if (delflg == '*')
row[0] = true;
else
row[0] = false;
foreach (FieldDescriptor field in fields)
{
switch (field.fieldType)
{
case dBaseType.N: // Number
byte[] NumberBytes = recReader.ReadBytes(field.fieldLen);
if (dBaseConverter.N_IsDecimal(NumberBytes)) {
row[fieldIndex + 1] = dBaseConverter.N_ToDecimal(NumberBytes);
} else {
row[fieldIndex + 1] = dBaseConverter.N_ToInt(NumberBytes);
}
break;
case dBaseType.C: // String
row[fieldIndex + 1] = dBaseConverter.C_ToString( recReader.ReadBytes(field.fieldLen));
break;
case dBaseType.M: // Memo
row[fieldIndex + 1] = ReadMemoBlock(dBaseConverter.N_ToInt(recReader.ReadBytes(field.fieldLen)));
break;
case dBaseType.D: // Date (YYYYMMDD)
DateTime DTFromFile = dBaseConverter.D_ToDateTime(recReader.ReadBytes(8));
if (DTFromFile == DateTime.MinValue) {
row[fieldIndex + 1] = System.DBNull.Value;
} else {
row[fieldIndex] = DTFromFile;
}
break;
case dBaseType.T:
row[fieldIndex + 1] = dBaseConverter.T_ToDateTime(recReader.ReadBytes(8));
break;
case dBaseType.L: // Boolean (Y/N)
row[fieldIndex + 1] = dBaseConverter.L_ToBool(recReader.ReadByte());
break;
case dBaseType.F:
row[fieldIndex + 1] = dBaseConverter.F_ToDouble(recReader.ReadBytes(field.fieldLen));
break;
}
fieldIndex++;
}
recReader.Close();
dt.Rows.Add(row);
}
}
catch
{
throw;
}
finally
{
if (null != br)
{
br.Close();
}
if (dbtReader != null)
{
dbtReader.Close();
dbtReader = null;
}
}
long count = DateTime.Now.Ticks - start;
return dt;
}
