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/*
* Copyright (C) 2011 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.jack.dx.io;
import com.android.jack.dx.util.ByteInput;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
public class EncodedValueCodec {
private EncodedValueCodec() {}
/**
* Read a signed integer.
*
* @param zwidth byte count minus one
*/
public static int readSignedInt(@Nonnull ByteInput in, @Nonnegative int zwidth) {
int result = 0;
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
}
result >>= (3 - zwidth) * 8;
return result;
}
/**
* Read an unsigned integer.
*
* @param zwidth byte count minus one
* @param fillOnRight true to zero fill on the right; false on the left
*/
public static int readUnsignedInt(@Nonnull ByteInput in, @Nonnegative int zwidth,
boolean fillOnRight) {
int result = 0;
if (!fillOnRight) {
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
}
result >>>= (3 - zwidth) * 8;
} else {
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
}
}
return result;
}
/**
* Read a signed long.
*
* @param zwidth byte count minus one
*/
public static long readSignedLong(@Nonnull ByteInput in, @Nonnegative int zwidth) {
long result = 0;
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
}
result >>= (7 - zwidth) * 8;
return result;
}
/**
* Read an unsigned long.
*
* @param zwidth byte count minus one
* @param fillOnRight true to zero fill on the right; false on the left
*/
public static long readUnsignedLong(@Nonnull ByteInput in, @Nonnegative int zwidth,
boolean fillOnRight) {
long result = 0;
if (!fillOnRight) {
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
}
result >>>= (7 - zwidth) * 8;
} else {
for (int i = zwidth; i >= 0; i--) {
result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
}
}
return result;
}
}
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