| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.tika.parser.dbf; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Arrays; |
| import java.util.Calendar; |
| import java.util.GregorianCalendar; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.TimeZone; |
| |
| import org.apache.commons.io.IOUtils; |
| |
| import org.apache.tika.exception.TikaException; |
| import org.apache.tika.io.EndianUtils; |
| |
| class DBFFileHeader { |
| |
| private DBFReader.Version version; |
| private Calendar lastModified; |
| private int numRecords = -1; |
| private short numBytesInHeader; |
| private short numBytesInRecord; |
| private DBFColumnHeader[] cols; |
| |
| public static DBFFileHeader parse(InputStream is) throws IOException, TikaException { |
| DBFFileHeader header = new DBFFileHeader(); |
| |
| int firstByte = is.read(); |
| header.version = DBFReader.getVersion(firstByte); |
| if (header.version == null) { |
| throw new TikaException("Unrecognized first byte in DBFFile: " + firstByte); |
| } |
| int lastModYear = is.read(); |
| int lastModMonth = is.read(); |
| int lastModDay = is.read(); |
| Calendar now = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC"), Locale.ROOT); |
| |
| //if this was last modified after the current year, assume |
| //the file was created in 1900 |
| if (lastModYear + 2000 > now.get(Calendar.YEAR)) { |
| lastModYear += 1900; |
| } else { |
| lastModYear += 2000; |
| } |
| Calendar lastModified = new GregorianCalendar(TimeZone.getTimeZone("UTC"), Locale.ROOT); |
| lastModified.set(lastModYear, lastModMonth - 1, lastModDay, 0, 0, 0); |
| header.lastModified = lastModified; |
| |
| header.numRecords = EndianUtils.readIntLE(is); |
| header.numBytesInHeader = EndianUtils.readShortLE(is); |
| header.numBytesInRecord = EndianUtils.readShortLE(is); |
| IOUtils.skipFully(is, 20);//TODO: can get useful info out of here |
| |
| int numCols = 0;//(header.numBytesInHeader - 32) / 32; |
| List<DBFColumnHeader> headers = new LinkedList<>(); |
| int bytesAccountedFor = 0; |
| while (true) { |
| DBFColumnHeader colHeader = readCol(is); |
| bytesAccountedFor += colHeader.fieldLength; |
| numCols++; |
| headers.add(colHeader); |
| if (bytesAccountedFor >= header.numBytesInRecord - 1) { |
| break; |
| } |
| } |
| |
| header.cols = headers.toArray(new DBFColumnHeader[0]); |
| |
| int endOfHeader = is.read(); |
| if (endOfHeader != 13) { |
| throw new TikaException("Expected new line at end of header"); |
| } |
| long totalReadSoFar = 32 + (numCols * 32) + 1; |
| //there can be extra bytes in the header |
| long extraHeaderBytes = header.numBytesInHeader - totalReadSoFar; |
| IOUtils.skipFully(is, extraHeaderBytes); |
| return header; |
| } |
| |
| private static DBFColumnHeader readCol(InputStream is) throws IOException, TikaException { |
| byte[] fieldRecord = new byte[32]; |
| IOUtils.readFully(is, fieldRecord); |
| |
| DBFColumnHeader col = new DBFColumnHeader(); |
| col.name = new byte[11]; |
| System.arraycopy(fieldRecord, 0, col.name, 0, 10); |
| |
| int colType = fieldRecord[11] & 0xFF; |
| if (colType < 0) { |
| throw new IOException("File truncated before coltype in header"); |
| } |
| col.setType(colType); |
| col.fieldLength = fieldRecord[16] & 0xFF; |
| if (col.fieldLength < 0) { |
| throw new TikaException( |
| "Field length for column " + col.getName(StandardCharsets.US_ASCII) + |
| " is < 0"); |
| } else if (col.fieldLength > DBFReader.MAX_FIELD_LENGTH) { |
| throw new TikaException("Field length (" + col.fieldLength + |
| ") is greater than DBReader.MAX_FIELD_LENGTH (" + DBFReader.MAX_FIELD_LENGTH + |
| ")"); |
| } |
| col.decimalCount = fieldRecord[17] & 0xFF; |
| return col; |
| } |
| |
| DBFColumnHeader[] getCols() { |
| return cols; |
| } |
| |
| int getNumRecords() { |
| return numRecords; |
| } |
| |
| Calendar getLastModified() { |
| return lastModified; |
| } |
| |
| DBFReader.Version getVersion() { |
| return version; |
| } |
| |
| @Override |
| public String toString() { |
| return "DBFFileHeader{" + "lastModified=" + lastModified + ", numRecords=" + numRecords + |
| ", numBytesInHeader=" + numBytesInHeader + ", numBytesInRecord=" + |
| numBytesInRecord + ", cols=" + Arrays.toString(cols) + '}'; |
| } |
| } |