com.squareup.spoon.axmlparser.ReadUtil Maven / Gradle / Ivy
/*
* Copyright 2008 Android4ME
*
* 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.squareup.spoon.axmlparser;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
/**
* @author Dmitry Skiba
*
* Various read helpers.
*
* TODO: remove? (as we have IntReader now)
*
*/
public class ReadUtil {
public static final void readCheckType(InputStream stream,int expectedType) throws IOException {
int type=readInt(stream);
if (type!=expectedType) {
throw new IOException(
"Expected chunk of type 0x"+Integer.toHexString(expectedType)+
", read 0x"+Integer.toHexString(type)+".");
}
}
public static final void readCheckType(IntReader reader,int expectedType) throws IOException {
int type=reader.readInt();
if (type!=expectedType) {
throw new IOException(
"Expected chunk of type 0x"+Integer.toHexString(expectedType)+
", read 0x"+Integer.toHexString(type)+".");
}
}
public static final int[] readIntArray(InputStream stream,int elementCount) throws IOException {
int[] result=new int[elementCount];
for (int i=0;i!=elementCount;++i) {
result[i]=readInt(stream);
}
return result;
}
public static final int readInt(InputStream stream) throws IOException {
return readInt(stream,4);
}
public static final int readShort(InputStream stream) throws IOException {
return readInt(stream,2);
}
public static final String readString(InputStream stream) throws IOException {
int length=readShort(stream);
StringBuilder builder=new StringBuilder(length);
for (int i=0;i!=length;++i) {
builder.append((char)readShort(stream));
}
readShort(stream);
return builder.toString();
}
public static final int readInt(InputStream stream,int length) throws IOException {
int result=0;
for (int i=0;i!=length;++i) {
int b=stream.read();
if (b==-1) {
throw new EOFException();
}
result|=(b<<(i*8));
}
return result;
}
}