| /* |
| * Copyright (C) 2018 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 libcore.java.nio.charset; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.lang.reflect.Field; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CodingErrorAction; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import junitparams.JUnitParamsRunner; |
| import junitparams.Parameters; |
| |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| /** |
| * Tests for the encoding behavior of charsets in {@link StandardCharsets}. |
| */ |
| @RunWith(JUnitParamsRunner.class) |
| public class StandardCharsetsEncoderTest { |
| |
| private static final String DELIMITER = ":"; |
| /** Big enough for a single codepoint */ |
| private static final CharBuffer CHAR_BUFFER = CharBuffer.allocate(5); |
| /** Big enough for the encoding for a single code point */ |
| private static final ByteBuffer BYTE_BUFFER = ByteBuffer.allocate(5); |
| |
| /** |
| * Returns the charsets to test. |
| */ |
| public static Charset[] getStandardCharsets() throws Exception { |
| List<Charset> charsets = new ArrayList<>(); |
| for (Field field : StandardCharsets.class.getFields()) { |
| if (field.getType() == Charset.class) { |
| charsets.add((Charset) field.get(null)); |
| } |
| } |
| assertTrue(charsets.size() >= 6); |
| return charsets.toArray(new Charset[0]); |
| } |
| |
| /** |
| * Tests recorded reference data against actual encoder behavior. |
| * Reference data files can be created / updated using {@link Dumper} to dump existing Android |
| * behavior. |
| */ |
| @Parameters(method = "getStandardCharsets") |
| @Test |
| public void testCharset(Charset charset) throws Exception { |
| String fileName = createFileName(charset); |
| CharsetEncoder encoder = charset.newEncoder(); |
| List<String> failures = new ArrayList<>(); |
| try (BufferedReader reader = createAsciiReader(openResource(fileName))) { |
| String expectedInfo; |
| while ((expectedInfo = reader.readLine()) != null) { |
| // Ignore comment lines |
| if (expectedInfo.startsWith("#")) { |
| continue; |
| } |
| String[] parts = expectedInfo.split(DELIMITER); |
| int codePoint = Integer.parseInt(parts[0]); |
| String actualInfo = createCodePointInfo(encoder, codePoint); |
| if (!expectedInfo.equals(actualInfo)) { |
| failures.add("Expected=" + expectedInfo + ", actual=" + actualInfo); |
| } |
| } |
| } |
| if (!failures.isEmpty()) { |
| fail("Failures:\n" + failures); |
| } |
| } |
| |
| private static InputStream openResource(String fileName) { |
| InputStream is = StandardCharsetsEncoderTest.class.getResourceAsStream(fileName); |
| if (is == null) { |
| fail("No resource found: " + fileName); |
| } |
| return is; |
| } |
| |
| /** |
| * Generates reference data for use by {@link #testCharset(Charset)}. Run the main method in |
| * this class to obtain new reference files from current Android behavior. Pass the name of the |
| * directory in which to create files. |
| * |
| * <p>For example: |
| * <pre> |
| * make vogar && make build-art-host && make core-tests |
| * vogar --mode host --runner-type main \ |
| * --classpath \ |
| * ${ANDROID_PRODUCT_OUT}/obj/JAVA_LIBRARIES/core-tests_intermediates/javalib.jar \ |
| * 'libcore.java.nio.charset.StandardCharsetsEncoderTest$Dumper' \ |
| * -- libcore/luni/src/test/resources/libcore/java/nio/charset |
| * </pre> |
| */ |
| public static class Dumper { |
| |
| public static void main(String[] args) throws Exception { |
| String dir = args[0]; |
| for (Charset charset : getStandardCharsets()) { |
| CharsetEncoder coreEncoder = charset.newEncoder(); |
| dumpEncodings(coreEncoder, dir + "/" + createFileName(charset)); |
| } |
| } |
| |
| /** |
| * Generates a set of reference data from the current CharsetEncoder behavior into the |
| * specified file. |
| */ |
| private static void dumpEncodings(CharsetEncoder encoder, String fileName) |
| throws IOException { |
| encoder.onMalformedInput(CodingErrorAction.IGNORE); |
| encoder.onUnmappableCharacter(CodingErrorAction.IGNORE); |
| |
| try (BufferedWriter writer = createAsciiWriter(new FileOutputStream(fileName))) { |
| writeLine(writer, "# Reference encodings for " + encoder.charset().name() |
| + " generated by " + Dumper.class); |
| writeLine(writer, "# Encodings are used by " + StandardCharsetsEncoderTest.class); |
| writeLine(writer, "# {codepoint}:{canEncode}:{encoding bytes}"); |
| |
| for (int codePoint = 0; codePoint < 0xfffd; codePoint++) { |
| String codePointInfo = createCodePointInfo(encoder, codePoint); |
| writeLine(writer, codePointInfo); |
| } |
| } |
| } |
| |
| private static void writeLine(BufferedWriter writer, String text) throws IOException { |
| writer.append(text); |
| writer.newLine(); |
| } |
| } |
| |
| private static String createCodePointInfo(CharsetEncoder encoder, int codePoint) { |
| StringBuilder stringBuilder = new StringBuilder(); |
| String utf16 = new String(Character.toChars(codePoint)); |
| |
| // Format: {codepoint:int}:{canEncode():bool}:{encode():bytes} |
| stringBuilder.append(Integer.toString(codePoint)); |
| stringBuilder.append(DELIMITER); |
| stringBuilder.append(Boolean.toString(encoder.canEncode(utf16))); |
| stringBuilder.append(DELIMITER); |
| |
| // Encode |
| CHAR_BUFFER.append(utf16); |
| CHAR_BUFFER.flip(); |
| |
| encoder.encode(CHAR_BUFFER, BYTE_BUFFER, true /* endOfInput */); |
| encoder.reset(); |
| |
| BYTE_BUFFER.flip(); |
| |
| // Append the encoded bytes, if any. |
| byte[] bytes = new byte[BYTE_BUFFER.limit()]; |
| BYTE_BUFFER.get(bytes, 0, BYTE_BUFFER.limit()); |
| stringBuilder.append(createBytesString(bytes)); |
| |
| CHAR_BUFFER.clear(); |
| BYTE_BUFFER.clear(); |
| |
| return stringBuilder.toString(); |
| } |
| |
| private static String createBytesString(byte[] bytes) { |
| StringBuilder builder = new StringBuilder(); |
| for (int i = 0; i < bytes.length; i++) { |
| int byteValues = Byte.toUnsignedInt(bytes[i]); |
| builder.append(Integer.toString(byteValues)); |
| if (i < bytes.length - 1) { |
| builder.append(','); |
| } |
| } |
| return builder.toString(); |
| } |
| |
| private static BufferedWriter createAsciiWriter(OutputStream out) { |
| return new BufferedWriter(new OutputStreamWriter(out, StandardCharsets.US_ASCII)); |
| } |
| |
| private static BufferedReader createAsciiReader(InputStream in) { |
| return new BufferedReader(new InputStreamReader(in, StandardCharsets.US_ASCII)); |
| } |
| |
| private static String createFileName(Charset charset) { |
| return "encodings_" + charset.name() + ".txt"; |
| } |
| } |