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Genericize getting a raw dictionary

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This will allow for not copying the whole dictionary when only
the header is needed.

Change-Id: Ie4a649b507ccd4a430201824ed87b8b8bbf55e9f
This commit is contained in:
Jean Chalard 2014-10-21 16:20:19 +09:00
parent ab68143ad0
commit 5564317f83
3 changed files with 71 additions and 48 deletions
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107
tools/dicttool/src/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java
View File

@ -35,6 +35,9 @@ import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Arrays;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Class grouping utilities for offline dictionary making.
*
@ -45,10 +48,9 @@ public final class BinaryDictOffdeviceUtils {
// Prefix and suffix are arbitrary, the values do not really matter
private final static String PREFIX = "dicttool";
private final static String SUFFIX = ".tmp";
private final static int COPY_BUFFER_SIZE = 8192;
public static class DecoderChainSpec {
public static class DecoderChainSpec<T> {
public final static int COMPRESSION = 1;
public final static int ENCRYPTION = 2;
@ -57,16 +59,16 @@ public final class BinaryDictOffdeviceUtils {
};
private final int mDecoderSpecIndex;
File mFile;
T mResult;
public DecoderChainSpec() {
mDecoderSpecIndex = 0;
mFile = null;
mResult = null;
}
private DecoderChainSpec(final DecoderChainSpec src) {
private DecoderChainSpec(final DecoderChainSpec<T> src) {
mDecoderSpecIndex = src.mDecoderSpecIndex + 1;
mFile = src.mFile;
mResult = src.mResult;
}
private String getStepDescription(final int step) {
@ -115,6 +117,31 @@ public final class BinaryDictOffdeviceUtils {
}
}
public interface InputProcessor<T> {
@Nonnull
public T process(@Nonnull final InputStream input)
throws IOException, UnsupportedFormatException;
}
public static class CopyProcessor implements InputProcessor<File> {
@Override @Nonnull
public File process(@Nonnull final InputStream input) throws IOException,
UnsupportedFormatException {
final File dst = File.createTempFile(PREFIX, SUFFIX);
dst.deleteOnExit();
try (final OutputStream output = new BufferedOutputStream(new FileOutputStream(dst))) {
copy(input, output);
output.flush();
output.close();
if (BinaryDictDecoderUtils.isBinaryDictionary(dst)
|| CombinedInputOutput.isCombinedDictionary(dst.getAbsolutePath())) {
return dst;
}
}
throw new UnsupportedFormatException("Input stream not at the expected format");
}
}
public static void copy(final InputStream input, final OutputStream output) throws IOException {
final byte[] buffer = new byte[COPY_BUFFER_SIZE];
for (int readBytes = input.read(buffer); readBytes >= 0; readBytes = input.read(buffer)) {
@ -123,46 +150,42 @@ public final class BinaryDictOffdeviceUtils {
}
/**
* Returns a decrypted/uncompressed dictionary.
* Process a dictionary, decrypting/uncompressing it on the fly as necessary.
*
* This will decrypt/uncompress any number of times as necessary until it finds the
* dictionary signature, and copy the decoded file to a temporary place.
* If this is not a dictionary, the method returns null.
* This will execute the given processor repeatedly with the possible alternatives
* for dictionary format until the processor does not throw an exception.
* If the processor succeeds for none of the possible formats, the method returns null.
*/
public static DecoderChainSpec getRawDictionaryOrNull(final File src) {
DecoderChainSpec spec = new DecoderChainSpec();
if (BinaryDictDecoderUtils.isBinaryDictionary(src)
|| CombinedInputOutput.isCombinedDictionary(src.getAbsolutePath())) {
spec.mFile = src;
return spec;
}
@Nullable
public static <T> DecoderChainSpec<T> decodeDictionaryForProcess(@Nonnull final File src,
@Nonnull final InputProcessor<T> processor) {
@Nonnull DecoderChainSpec spec = new DecoderChainSpec();
while (null != spec) {
try {
final File dst = File.createTempFile(PREFIX, SUFFIX);
dst.deleteOnExit();
try (final InputStream input = spec.getStream(src);
final OutputStream output =
new BufferedOutputStream(new FileOutputStream(dst))) {
copy(input, output);
output.flush();
output.close();
if (BinaryDictDecoderUtils.isBinaryDictionary(dst)
|| CombinedInputOutput.isCombinedDictionary(
dst.getAbsolutePath())) {
spec.mFile = dst;
return spec;
}
}
} catch (IOException e) {
// This was not the right format, fall through and try the next
System.out.println("Rejecting " + spec.describeChain() + " : " + e);
System.out.println(e.getStackTrace()[0].toString());
try (final InputStream input = spec.getStream(src)) {
spec.mResult = processor.process(input);
return spec;
}
} catch (IOException | UnsupportedFormatException e) {
// If the format is not the right one for this file, the processor will throw one
// of these exceptions. In our case, that means we should try the next spec,
// since it may still be at another format we haven't tried yet.
// TODO: stop using exceptions for this non-exceptional case.
}
spec = spec.next();
}
return null;
}
/**
* Get a decoder chain spec with a raw dictionary file. This makes a new file on the
* disk ready for any treatment the client wants.
*/
@Nullable
public static DecoderChainSpec<File> getRawDictionaryOrNull(@Nonnull final File src) {
return decodeDictionaryForProcess(src, new CopyProcessor());
}
static FusionDictionary getDictionary(final String filename, final boolean report) {
final File file = new File(filename);
if (report) {
@ -170,28 +193,28 @@ public final class BinaryDictOffdeviceUtils {
System.out.println("Size : " + file.length() + " bytes");
}
try {
final DecoderChainSpec decodedSpec = getRawDictionaryOrNull(file);
final DecoderChainSpec<File> decodedSpec = getRawDictionaryOrNull(file);
if (null == decodedSpec) {
throw new RuntimeException("Does not seem to be a dictionary file " + filename);
}
if (CombinedInputOutput.isCombinedDictionary(decodedSpec.mFile.getAbsolutePath())) {
if (CombinedInputOutput.isCombinedDictionary(decodedSpec.mResult.getAbsolutePath())) {
if (report) {
System.out.println("Format : Combined format");
System.out.println("Packaging : " + decodedSpec.describeChain());
System.out.println("Uncompressed size : " + decodedSpec.mFile.length());
System.out.println("Uncompressed size : " + decodedSpec.mResult.length());
}
try (final BufferedReader reader = new BufferedReader(
new InputStreamReader(new FileInputStream(decodedSpec.mFile), "UTF-8"))) {
new InputStreamReader(new FileInputStream(decodedSpec.mResult), "UTF-8"))) {
return CombinedInputOutput.readDictionaryCombined(reader);
}
}
final DictDecoder dictDecoder = BinaryDictIOUtils.getDictDecoder(
decodedSpec.mFile, 0, decodedSpec.mFile.length(),
decodedSpec.mResult, 0, decodedSpec.mResult.length(),
DictDecoder.USE_BYTEARRAY);
if (report) {
System.out.println("Format : Binary dictionary format");
System.out.println("Packaging : " + decodedSpec.describeChain());
System.out.println("Uncompressed size : " + decodedSpec.mFile.length());
System.out.println("Uncompressed size : " + decodedSpec.mResult.length());
}
return dictDecoder.readDictionaryBinary(false /* deleteDictIfBroken */);
} catch (final IOException | UnsupportedFormatException e) {

6
tools/dicttool/src/com/android/inputmethod/latin/dicttool/Package.java
View File

@ -77,16 +77,16 @@ public class Package {
if (mArgs.length != 2) {
throw new RuntimeException("Too many/too few arguments for command " + COMMAND);
}
final BinaryDictOffdeviceUtils.DecoderChainSpec decodedSpec =
final BinaryDictOffdeviceUtils.DecoderChainSpec<File> decodedSpec =
BinaryDictOffdeviceUtils.getRawDictionaryOrNull(new File(mArgs[0]));
if (null == decodedSpec) {
System.out.println(mArgs[0] + " does not seem to be a dictionary");
return;
}
System.out.println("Packaging : " + decodedSpec.describeChain());
System.out.println("Uncompressed size : " + decodedSpec.mFile.length());
System.out.println("Uncompressed size : " + decodedSpec.mResult.length());
try (
final InputStream input = getFileInputStream(decodedSpec.mFile);
final InputStream input = getFileInputStream(decodedSpec.mResult);
final OutputStream output = new BufferedOutputStream(
getFileOutputStreamOrStdOut(mArgs[1]))
) {

6
tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
View File

@ -74,11 +74,11 @@ public class BinaryDictOffdeviceUtilsTests extends TestCase {
}
// Test for an actually compressed dictionary and its contents
final BinaryDictOffdeviceUtils.DecoderChainSpec decodeSpec =
final BinaryDictOffdeviceUtils.DecoderChainSpec<File> decodeSpec =
BinaryDictOffdeviceUtils.getRawDictionaryOrNull(dst);
assertEquals("Wrong decode spec", "raw > compression", decodeSpec.describeChain());
final DictDecoder dictDecoder = BinaryDictIOUtils.getDictDecoder(decodeSpec.mFile, 0,
decodeSpec.mFile.length());
final DictDecoder dictDecoder = BinaryDictIOUtils.getDictDecoder(decodeSpec.mResult, 0,
decodeSpec.mResult.length());
final FusionDictionary resultDict =
dictDecoder.readDictionaryBinary(false /* deleteDictIfBroken */);
assertEquals("Wrong version attribute", VERSION, resultDict.mOptions.mAttributes.get(