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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.jack.jayce.v0002.io;
import com.android.jack.util.StringUtils;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.annotation.Nonnull;
/**
* This class extends {@code DataOutputStream} to add uleb128 support for int and long.
*/
class JayceOutputStream implements DataOutput {
@Nonnull
private final DataOutputStream out;
public JayceOutputStream(@Nonnull OutputStream out) {
this.out = new DataOutputStream(out);
}
@Override
public void write(int b) throws IOException {
out.write(b);
}
@Override
public void write(byte[] b) throws IOException {
out.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
}
@Override
public void writeBoolean(boolean v) throws IOException {
out.writeBoolean(v);
}
@Override
public void writeByte(int v) throws IOException {
out.writeByte(v);
}
@Override
public void writeShort(int v) throws IOException {
out.writeShort(v);
}
@Override
public void writeChar(int v) throws IOException {
out.writeChar(v);
}
/**
* Encode an integer value into uleb128 format and write it to the stream.
*/
@Override
public void writeInt(int v) throws IOException {
int remaining = v >> 7;
boolean hasMore = true;
int end = ((v & Integer.MIN_VALUE) == 0) ? 0 : -1;
while (hasMore) {
hasMore = (remaining != end) || ((remaining & 1) != ((v >> 6) & 1));
writeByte((byte) ((v & 0x7f) | (hasMore ? 0x80 : 0)));
v = remaining;
remaining >>= 7;
}
}
/**
* Encode a long value into uleb128 format and write it to the stream.
*/
@Override
public void writeLong(long v) throws IOException {
long remaining = v >> 7;
boolean hasMore = true;
long end = ((v & Long.MIN_VALUE) == 0) ? 0 : -1;
while (hasMore) {
hasMore = (remaining != end) || ((remaining & 1) != ((v >> 6) & 1));
writeByte((byte) ((v & 0x7f) | (hasMore ? 0x80 : 0)));
v = remaining;
remaining >>= 7;
}
}
@Override
public void writeFloat(float v) throws IOException {
out.writeFloat(v);
}
@Override
public void writeDouble(double v) throws IOException {
out.writeDouble(v);
}
@Override
public void writeBytes(String s) throws IOException {
out.writeBytes(s);
}
@Override
public void writeChars(String s) throws IOException {
out.writeChars(s);
}
@Override
public void writeUTF(String s) throws IOException {
if (s == null) {
writeInt(-1);
} else {
byte[] utf8String = StringUtils.stringToUtf8Bytes(s);
writeInt(utf8String.length);
write(utf8String);
}
}
public void close() throws IOException {
out.close();
}
}
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