/// <summary>
/// Открыть файл
/// </summary>
/// <param name="file">путь к файлу</param>
/// <param name="encoding">кодировка</param>
/// <returns>Читатель DBF</returns>
private static DbfReader Open(string file, Encoding encoding)
{
var dbf = new DbfReader {
Encoding = encoding ?? Encoding.Default, _tablename = Path.GetFileNameWithoutExtension(file) + "DBF"
};
using (var f = File.OpenRead(file))
{
var buffer = new byte[f.Length];
f.Read(buffer, 0, (int)f.Length);
var mem = new MemoryStream(buffer);
dbf._reader = new BinaryReader(mem);
}
ReadHeader(dbf);
return(dbf);
}
private static void ReadHeader(DbfReader dbf)
{
dbf.Header = new DbfHeader
{
VersionNumber = (Signature)dbf._reader.ReadByte()
};
var year = dbf._reader.ReadByte();
var month = dbf._reader.ReadByte();
var day = dbf._reader.ReadByte();
dbf.Header.LastUpdate = new DateTime(1900 + year, month, day);
dbf.Header.NumberOfRecords = dbf._reader.ReadInt32();
dbf.Header.LengthOfHeader = dbf._reader.ReadInt16();
dbf.Header.LengthOfEachRecord = dbf._reader.ReadInt16();
//};
// Резерв
dbf._reader.ReadBytes(2);
dbf.Header.Transaction = (Transaction)dbf._reader.ReadByte();
dbf.Header.Encripted = (Encripted)dbf._reader.ReadByte();
// Free record thread
dbf._reader.ReadBytes(4);
// Reserved for multi-user dBASE
dbf._reader.ReadBytes(8);
dbf.Header.MDXFlag = dbf._reader.ReadByte();
dbf.Header.LanguageDriver = (CodePage)dbf._reader.ReadByte();
switch (dbf.Header.LanguageDriver)
{
case CodePage.СodePage1251:
case CodePage.Unknow:
dbf.Encoding = Encoding.GetEncoding(1251);
break;
case CodePage.СodePage866:
dbf.Encoding = Encoding.GetEncoding(866);
break;
}
// Reserved
dbf._reader.ReadBytes(2);
var list = new List <ColumnInfo>();
int flag;
var offset = 1;
var errors = new StringBuilder();
var types = new List <char>();
var fieldsEnum = typeof(DbfColumnType).GetFields();
// ReSharper disable LoopCanBeConvertedToQuery
// ReSharper disable ForCanBeConvertedToForeach
for (var index = 0; index < fieldsEnum.Length; index++)
// ReSharper restore ForCanBeConvertedToForeach
// ReSharper restore LoopCanBeConvertedToQuery
{
var type = fieldsEnum[index];
if (type.Name.Equals("value__"))
{
continue;
}
types.Add((char)(int)type.GetRawConstantValue());
}
do
{
var item = new ColumnInfo();
var name = dbf.Encoding.GetString(dbf._reader.ReadBytes(11)).TrimEnd(' ', (char)0x0);
var type = dbf._reader.ReadChar();
item.Name = name;
if (types.Any(x => x == type))
{
item.Type = (DbfColumnType)type;
}
else
{
errors.AppendFormat("Что за тип {0}? Как его обрабатывать? Поле {1}", type, name).AppendLine();
}
item.FieldDataAddress = dbf._reader.ReadInt32();
item.FieldLength = dbf._reader.ReadByte();
item.DecimalCount = dbf._reader.ReadByte();
// Reserved for multi-user dBASE
dbf._reader.ReadBytes(2);
item.WorkAreaID = dbf._reader.ReadByte();
// Reserved for multi-user dBASE
dbf._reader.ReadBytes(2);
item.FlagForSETFIELDS = dbf._reader.ReadByte();
// Reserved
dbf._reader.ReadBytes(7);
item.IndexFieldFlag = dbf._reader.ReadByte();
item.Offset = offset;
offset += item.FieldLength;
list.Add(item);
flag = dbf._reader.PeekChar();
} while (flag != 0x0D);
if (errors.Length > 0)
{
throw new DbfHeadException(errors.ToString());
}
dbf._reader.ReadByte();
dbf.Header.Columns = list;
dbf._reader.BaseStream.Position = dbf.Header.LengthOfHeader;
//Console.WriteLine(dbf.Header);
}
