Import dotnetDBF for error handling.
This commit is contained in:
Patrick Fic
182
dotnetdbf/DBFHeader.cs
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182
dotnetdbf/DBFHeader.cs
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/*
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DBFHeader
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Class for reading the metadata assuming that the given
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InputStream carries DBF data.
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This file is part of DotNetDBF packege.
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original author (javadbf): anil@linuxense.com 2004/03/31
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License: LGPL (http://www.gnu.org/copyleft/lesser.html)
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ported to C# (DotNetDBF): Jay Tuley <jay+dotnetdbf@tuley.name> 6/28/2007
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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namespace DotNetDBF
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{
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[Obsolete("Use DBFSignature instead", error:true)]
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public static class DBFSigniture
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{
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public const byte NotSet = 0,
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WithMemo = 0x80,
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DBase3 = 0x03,
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DBase3WithMemo = DBase3 | WithMemo;
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}
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public static class DBFSignature
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{
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public const byte NotSet = 0,
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WithMemo = 0x80,
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DBase3 = 0x03,
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DBase3WithMemo = DBase3 | WithMemo;
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}
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[Flags]
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public enum MemoFlags : byte
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{
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}
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public class DBFHeader
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{
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public const byte HeaderRecordTerminator = 0x0D;
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internal byte Signature { get; set; } /* 0 */
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internal byte Year { set; get; } /* 1 */
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internal byte Month { set; get; } /* 2 */
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internal byte Day { set; get; } /* 3 */
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internal int NumberOfRecords { set; get; } /* 4-7 */
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internal short HeaderLength { set; get; } /* 8-9 */
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internal short RecordLength { set; get; } /* 10-11 */
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private short _reserv1; /* 12-13 */
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private byte _incompleteTransaction; /* 14 */
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private byte _encryptionFlag; /* 15 */
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private int _freeRecordThread; /* 16-19 */
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private int _reserv2; /* 20-23 */
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private int _reserv3; /* 24-27 */
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private byte _mdxFlag; /* 28 */
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internal byte LanguageDriver { get; set; } /* 29 */
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private short _reserv4; /* 30-31 */
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internal DBFField[] FieldArray { set; get; } /* each 32 bytes */
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public DBFHeader()
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{
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Signature = DBFSignature.DBase3;
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}
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internal short Size => (short) (sizeof(byte) +
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sizeof(byte) + sizeof(byte) + sizeof(byte) +
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sizeof(int) +
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sizeof(short) +
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sizeof(short) +
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sizeof(short) +
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sizeof(byte) +
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sizeof(byte) +
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sizeof(int) +
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sizeof(int) +
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sizeof(int) +
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sizeof(byte) +
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sizeof(byte) +
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sizeof(short) +
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(DBFField.SIZE * FieldArray.Length) +
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sizeof(byte));
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internal short RecordSize
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{
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get
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{
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var tRecordLength = 0;
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for (var i = 0; i < FieldArray.Length; i++)
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{
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tRecordLength += FieldArray[i].FieldLength;
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}
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return (short) (tRecordLength + 1);
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}
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}
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internal void Read(BinaryReader dataInput)
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{
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Signature = dataInput.ReadByte(); /* 0 */
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Year = dataInput.ReadByte(); /* 1 */
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Month = dataInput.ReadByte(); /* 2 */
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Day = dataInput.ReadByte(); /* 3 */
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NumberOfRecords = dataInput.ReadInt32(); /* 4-7 */
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HeaderLength = dataInput.ReadInt16(); /* 8-9 */
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RecordLength = dataInput.ReadInt16(); /* 10-11 */
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_reserv1 = dataInput.ReadInt16(); /* 12-13 */
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_incompleteTransaction = dataInput.ReadByte(); /* 14 */
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_encryptionFlag = dataInput.ReadByte(); /* 15 */
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_freeRecordThread = dataInput.ReadInt32(); /* 16-19 */
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_reserv2 = dataInput.ReadInt32(); /* 20-23 */
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_reserv3 = dataInput.ReadInt32(); /* 24-27 */
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_mdxFlag = dataInput.ReadByte(); /* 28 */
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LanguageDriver = dataInput.ReadByte(); /* 29 */
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_reserv4 = dataInput.ReadInt16(); /* 30-31 */
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var v_fields = new List<DBFField>();
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var field = DBFField.CreateField(dataInput); /* 32 each */
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while (field != null)
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{
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v_fields.Add(field);
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field = DBFField.CreateField(dataInput);
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}
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FieldArray = v_fields.ToArray();
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//System.out.println( "Number of fields: " + _fieldArray.length);
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}
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internal void Write(BinaryWriter dataOutput)
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{
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dataOutput.Write(Signature); /* 0 */
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var tNow = DateTime.Now;
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Year = (byte) (tNow.Year - 1900);
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Month = (byte) (tNow.Month);
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Day = (byte) (tNow.Day);
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dataOutput.Write(Year); /* 1 */
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dataOutput.Write(Month); /* 2 */
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dataOutput.Write(Day); /* 3 */
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//System.out.println( "Number of records in O/S: " + numberOfRecords);
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dataOutput.Write(NumberOfRecords); /* 4-7 */
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HeaderLength = Size;
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dataOutput.Write(HeaderLength); /* 8-9 */
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RecordLength = RecordSize;
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dataOutput.Write(RecordLength); /* 10-11 */
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dataOutput.Write(_reserv1); /* 12-13 */
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dataOutput.Write(_incompleteTransaction); /* 14 */
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dataOutput.Write(_encryptionFlag); /* 15 */
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dataOutput.Write(_freeRecordThread); /* 16-19 */
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dataOutput.Write(_reserv2); /* 20-23 */
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dataOutput.Write(_reserv3); /* 24-27 */
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dataOutput.Write(_mdxFlag); /* 28 */
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dataOutput.Write(LanguageDriver); /* 29 */
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dataOutput.Write(_reserv4); /* 30-31 */
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foreach (var field in FieldArray)
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{
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field.Write(dataOutput);
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}
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dataOutput.Write(HeaderRecordTerminator); /* n+1 */
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}
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}
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}
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