private void readFieldDescriptors(LittleEndianInputStream is, int nFields) throws IOException {
// read description of each field
byte[] asciiFieldName = new byte[11];
for (int i = 0; i < nFields; i++) {
DBFField field = new DBFField();
is.read(asciiFieldName);
field.name = bytesToString(asciiFieldName, asciiFieldName.length, this.charsetName);
field.type = is.readUnsignedByte();
field.address = is.readInt();
field.length = is.readUnsignedByte();
field.decimalCount = is.readUnsignedByte();
is.readShort(); // overread reserved value
field.workAreaID = is.readUnsignedByte();
field.multiUserDBase = is.readShort();
field.setFields = is.readUnsignedByte();
is.skipBytes(7); // overread 7 reserved bytes
field.fieldInMDXIndex = is.readUnsignedByte();
this.fields.add(field);
this.printInfo("\n" + field.toString());
}
// overread the Header Record Terminator, which should be 0x0D
byte terminator = is.readByte();
if (terminator != 0x0D) {
throw new IOException("DBF file is corrupt.");
}
}
public Table read(String filePath) throws IOException {
LittleEndianInputStream is = null;
if (filePath == null) return null;
try {
// read all data into a data buffer.
is = new LittleEndianInputStream(new BufferedInputStream(new FileInputStream(filePath)));
int fileCode = unsignedByteToInt(is.readByte());
int year = unsignedByteToInt(is.readByte());
int month = unsignedByteToInt(is.readByte());
int day = unsignedByteToInt(is.readByte());
long nbrRecords = is.readInt(); // & 0xffffffffL;// unsigned int
int headerSize = is.readShort();
int recordSize = is.readShort();
is.readShort(); // overread reserved value
is.readByte(); // transaction byte
int encrypted = is.readUnsignedByte(); // encription byte
is.skipBytes(13);
int codepage = is.readUnsignedByte();
is.skipBytes(2);
// map the codepage to a string. Based on:
// http://www.clicketyclick.dk/databases/xbase/format/dbf.html#DBF_STRUCT
switch (codepage) {
case 0x01: // DOS USA code page 437
this.charsetName = "IBM437";
break;
case 0x02: // DOS Multilingual code page 850
this.charsetName = "IBM850";
break;
case 0x03: // Windows ANSI code page 1252
this.charsetName = "windows-1252";
break;
case 0x04: // Standard Macintosh
this.charsetName = "MacRoman";
break;
// ESRI shape files use code 0x57 to indicate that
// data is written in ANSI (whatever that means).
// http://www.esricanada.com/english/support/faqs/arcview/avfaq21.asp
case 0x57:
this.charsetName = "windows-1252";
break;
case 0x64: // EE MS-DOS code page 852
this.charsetName = "IBM852";
break;
case 0x65: // Nordic MS-DOS code page 865
this.charsetName = "IBM865";
break;
case 0x66: // Russian MS-DOS code page 866
this.charsetName = "IBM866";
break;
case 0x67: // Icelandic MS-DOS
this.charsetName = "IBM861";
break;
/*
case 0x68: // Kamenicky (Czech) MS-DOS
// ?
break;
case 0x69: // Mazovia (Polish) MS-DOS
// ?
break;
*/
case 0x6A: // Greek MS-DOS (437G) [?]
this.charsetName = "x-IBM737";
break;
case 0x6B: // Turkish MS-DOS
this.charsetName = "IBM857";
break;
case 0x96: // Russian Macintosh
this.charsetName = "x-MacCyrillic";
break;
case 0x97: // Eastern European Macintosh
this.charsetName = "x-MacCentralEurope";
break;
case 0x98: // Greek Macintosh
this.charsetName = "x-MacGreek";
break;
case 0xC8: // Windows EE (=Eastern Europe?) code page 1250
this.charsetName = "windows-1250";
break;
case 0xC9: // Russian Windows
this.charsetName = "windows-1251";
break;
case 0xCA: // Turkish Windows
this.charsetName = "windows-1254";
break;
case 0xCB: // Greek Windows
this.charsetName = "windows-1253";
break;
default:
this.charsetName = "IBM437";
}
this.printInfo("File Code: " + fileCode);
this.printInfo("Year: " + year);
this.printInfo("Month: " + month);
this.printInfo("Day: " + day);
this.printInfo("Nbr Records: " + nbrRecords);
this.printInfo("Header Size: " + headerSize);
this.printInfo("Record Size: " + recordSize);
this.printInfo("Ecrypted: " + encrypted);
this.printInfo("Codepage: " + codepage);
if (encrypted != 0) throw new IOException("Encrypted DBF not supported.");
int nFields = (headerSize - 32) / 32;
this.readFieldDescriptors(is, nFields);
// create an new table
Table table = this.initTable("ShapeAttributes");
// read the records and fill the table
for (int i = 0; i < nbrRecords; i++) {
this.printInfo("Reading Record " + i);
this.readRecord(is, recordSize, table);
}
return table;
} finally {
if (is != null) is.close();
}
}
