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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());
}
}
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