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am 1d15fe7e: [AD2] Add a helper method to read an arbitrary dict header

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* commit '1d15fe7e51075e77b7cb477cf8de6569b8eefa2f':
  [AD2] Add a helper method to read an arbitrary dict header
This commit is contained in:
Jean Chalard 2013-01-18 03:39:19 -08:00 committed by Android Git Automerger
commit 3cd6b223c8
1 changed files with 27 additions and 0 deletions
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java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
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@ -25,8 +25,12 @@ import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
@ -977,4 +981,27 @@ public final class BinaryDictIOUtils {
}
return null;
}
/**
* Convenience method to read the header of a binary file.
*
* This is quite resource intensive - don't call when performance is critical.
*
* @param file The file to read.
*/
private static final int HEADER_READING_BUFFER_SIZE = 16384;
public static FileHeader getDictionaryFileHeader(final File file)
throws FileNotFoundException, IOException, UnsupportedFormatException {
final byte[] buffer = new byte[HEADER_READING_BUFFER_SIZE];
final FileInputStream inStream = new FileInputStream(file);
try {
inStream.read(buffer);
final BinaryDictInputOutput.ByteBufferWrapper wrapper =
new BinaryDictInputOutput.ByteBufferWrapper(inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, file.length()));
return BinaryDictInputOutput.readHeader(wrapper);
} finally {
inStream.close();
}
}
}