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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed 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 com.android.inputmethod.latin.makedict;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
import com.android.inputmethod.latin.utils.JniUtils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
/**
* An implementation of DictDecoder for version 3 binary dictionary.
*/
@UsedForTesting
public class Ver3DictDecoder implements DictDecoder {
static {
JniUtils.loadNativeLibrary();
}
// TODO: implement something sensical instead of just a phony method
private static native int doNothing();
private final static class HeaderReader {
protected static int readVersion(final DictBuffer dictBuffer)
throws IOException, UnsupportedFormatException {
return BinaryDictDecoderUtils.checkFormatVersion(dictBuffer);
}
protected static int readOptionFlags(final DictBuffer dictBuffer) {
return dictBuffer.readUnsignedShort();
}
protected static int readHeaderSize(final DictBuffer dictBuffer) {
return dictBuffer.readInt();
}
protected static HashMap<String, String> readAttributes(final DictBuffer dictBuffer,
final int headerSize) {
final HashMap<String, String> attributes = new HashMap<String, String>();
while (dictBuffer.position() < headerSize) {
// We can avoid an infinite loop here since dictBuffer.position() is always
// increased by calling CharEncoding.readString.
final String key = CharEncoding.readString(dictBuffer);
final String value = CharEncoding.readString(dictBuffer);
attributes.put(key, value);
}
dictBuffer.position(headerSize);
return attributes;
}
}
private final File mDictionaryBinaryFile;
private DictBuffer mDictBuffer;
public Ver3DictDecoder(final File file) {
mDictionaryBinaryFile = file;
mDictBuffer = null;
}
public void openDictBuffer(final DictDecoder.DictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
mDictBuffer = factory.getDictionaryBuffer(mDictionaryBinaryFile);
}
public DictBuffer getDictBuffer() {
return mDictBuffer;
}
@UsedForTesting
public DictBuffer openAndGetDictBuffer(final DictDecoder.DictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
openDictBuffer(factory);
return getDictBuffer();
}
@Override
public FileHeader readHeader() throws IOException, UnsupportedFormatException {
final int version = HeaderReader.readVersion(mDictBuffer);
final int optionsFlags = HeaderReader.readOptionFlags(mDictBuffer);
final int headerSize = HeaderReader.readHeaderSize(mDictBuffer);
if (headerSize < 0) {
throw new UnsupportedFormatException("header size can't be negative.");
}
final HashMap<String, String> attributes = HeaderReader.readAttributes(mDictBuffer,
headerSize);
final FileHeader header = new FileHeader(headerSize,
new FusionDictionary.DictionaryOptions(attributes,
0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
new FormatOptions(version,
0 != (optionsFlags & FormatSpec.SUPPORTS_DYNAMIC_UPDATE)));
return header;
}
}
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