Move Base64Reader to utils package (cbd219a7) · Commits · e / os / android_packages_inputmethods_LatinIME

java/src/com/android/inputmethod/latin/utils/Base64Reader.java

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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.utils;

		import com.android.inputmethod.annotations.UsedForTesting;

		import java.io.EOFException;
		import java.io.IOException;
		import java.io.LineNumberReader;

		@UsedForTesting
		public class Base64Reader {
		private final LineNumberReader mReader;

		private String mLine;
		private int mCharPos;
		private int mByteCount;

		@UsedForTesting
		public Base64Reader(final LineNumberReader reader) {
		mReader = reader;
		reset();
		}

		@UsedForTesting
		public void reset() {
		mLine = null;
		mCharPos = 0;
		mByteCount = 0;
		}

		@UsedForTesting
		public int getLineNumber() {
		return mReader.getLineNumber();
		}

		@UsedForTesting
		public int getByteCount() {
		return mByteCount;
		}

		private void fillBuffer() throws IOException {
		if (mLine == null \|\| mCharPos >= mLine.length()) {
		mLine = mReader.readLine();
		mCharPos = 0;
		}
		if (mLine == null) {
		throw new EOFException();
		}
		}

		private int peekUint8() throws IOException {
		fillBuffer();
		final char c = mLine.charAt(mCharPos);
		if (c >= 'A' && c <= 'Z')
		return c - 'A' + 0;
		if (c >= 'a' && c <= 'z')
		return c - 'a' + 26;
		if (c >= '0' && c <= '9')
		return c - '0' + 52;
		if (c == '+')
		return 62;
		if (c == '/')
		return 63;
		if (c == '=')
		return 0;
		throw new RuntimeException("Unknown character '" + c + "' in base64 at line "
		+ mReader.getLineNumber());
		}

		private int getUint8() throws IOException {
		final int value = peekUint8();
		mCharPos++;
		return value;
		}

		@UsedForTesting
		public int readUint8() throws IOException {
		final int value1, value2;
		switch (mByteCount % 3) {
		case 0:
		value1 = getUint8() << 2;
		value2 = value1 \| (peekUint8() >> 4);
		break;
		case 1:
		value1 = (getUint8() & 0x0f) << 4;
		value2 = value1 \| (peekUint8() >> 2);
		break;
		default:
		value1 = (getUint8() & 0x03) << 6;
		value2 = value1 \| getUint8();
		break;
		}
		mByteCount++;
		return value2;
		}

		@UsedForTesting
		public short readInt16() throws IOException {
		final int data = readUint8() << 8;
		return (short)(data \| readUint8());
		}
		}

tests/src/com/android/inputmethod/latin/utils/Base64ReaderTests.java

0 → 100644

+225 −0

Original line number	Diff line number	Diff line
		/*
		* 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.utils;

		import android.test.AndroidTestCase;
		import android.test.suitebuilder.annotation.SmallTest;

		import java.io.EOFException;
		import java.io.IOException;
		import java.io.LineNumberReader;
		import java.io.StringReader;

		@SmallTest
		public class Base64ReaderTests extends AndroidTestCase {
		private static final String EMPTY_STRING = "";
		private static final String INCOMPLETE_CHAR1 = "Q";
		// Encode 'A'.
		private static final String INCOMPLETE_CHAR2 = "QQ";
		// Encode 'A', 'B'
		private static final String INCOMPLETE_CHAR3 = "QUI";
		// Encode 'A', 'B', 'C'
		private static final String COMPLETE_CHAR4 = "QUJD";
		private static final String ALL_BYTE_PATTERN =
		"AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIj\n"
		+ "JCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZH\n"
		+ "SElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWpr\n"
		+ "bG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6P\n"
		+ "kJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKz\n"
		+ "tLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX\n"
		+ "2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7\n"
		+ "/P3+/w==";

		public void test0CharInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(EMPTY_STRING)));
		try {
		reader.readUint8();
		fail("0 char");
		} catch (final EOFException e) {
		assertEquals("0 char", 0, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test1CharInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR1)));
		try {
		reader.readUint8();
		fail("1 char");
		} catch (final EOFException e) {
		assertEquals("1 char", 0, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test2CharsInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR2)));
		try {
		final int v1 = reader.readUint8();
		assertEquals("2 chars pos 0", 'A', v1);
		reader.readUint8();
		fail("2 chars");
		} catch (final EOFException e) {
		assertEquals("2 chars", 1, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test3CharsInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR3)));
		try {
		final int v1 = reader.readUint8();
		assertEquals("3 chars pos 0", 'A', v1);
		final int v2 = reader.readUint8();
		assertEquals("3 chars pos 1", 'B', v2);
		reader.readUint8();
		fail("3 chars");
		} catch (final EOFException e) {
		assertEquals("3 chars", 2, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test4CharsInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(COMPLETE_CHAR4)));
		try {
		final int v1 = reader.readUint8();
		assertEquals("4 chars pos 0", 'A', v1);
		final int v2 = reader.readUint8();
		assertEquals("4 chars pos 1", 'B', v2);
		final int v3 = reader.readUint8();
		assertEquals("4 chars pos 2", 'C', v3);
		reader.readUint8();
		fail("4 chars");
		} catch (final EOFException e) {
		assertEquals("4 chars", 3, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void testAllBytePatternInt8() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(ALL_BYTE_PATTERN)));
		try {
		for (int i = 0; i <= 0xff; i++) {
		final int v = reader.readUint8();
		assertEquals("value: all byte pattern: pos " + i, i, v);
		assertEquals("count: all byte pattern: pos " + i, i + 1, reader.getByteCount());
		}
		} catch (final EOFException e) {
		assertEquals("all byte pattern", 256, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test0CharInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(EMPTY_STRING)));
		try {
		reader.readInt16();
		fail("0 char");
		} catch (final EOFException e) {
		assertEquals("0 char", 0, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test1CharInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR1)));
		try {
		reader.readInt16();
		fail("1 char");
		} catch (final EOFException e) {
		assertEquals("1 char", 0, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test2CharsInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR2)));
		try {
		reader.readInt16();
		fail("2 chars");
		} catch (final EOFException e) {
		assertEquals("2 chars", 1, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test3CharsInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(INCOMPLETE_CHAR3)));
		try {
		final short v1 = reader.readInt16();
		assertEquals("3 chars pos 0", 'A' << 8 \| 'B', v1);
		reader.readInt16();
		fail("3 chars");
		} catch (final EOFException e) {
		assertEquals("3 chars", 2, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void test4CharsInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(COMPLETE_CHAR4)));
		try {
		final short v1 = reader.readInt16();
		assertEquals("4 chars pos 0", 'A' << 8 \| 'B', v1);
		reader.readInt16();
		fail("4 chars");
		} catch (final EOFException e) {
		assertEquals("4 chars", 3, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}

		public void testAllBytePatternInt16() {
		final Base64Reader reader = new Base64Reader(
		new LineNumberReader(new StringReader(ALL_BYTE_PATTERN)));
		try {
		for (int i = 0; i <= 0xff; i += 2) {
		final short v = reader.readInt16();
		final short expected = (short)(i << 8 \| (i + 1));
		assertEquals("value: all byte pattern: pos " + i, expected, v);
		assertEquals("count: all byte pattern: pos " + i, i + 2, reader.getByteCount());
		}
		} catch (final EOFException e) {
		assertEquals("all byte pattern", 256, reader.getByteCount());
		} catch (final IOException e) {
		fail("IOException: " + e);
		}
		}
		}