cn.wjybxx.dson.io.DsonInputs Maven / Gradle / Ivy
/*
* Copyright 2023-2024 wjybxx([email protected])
*
* 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 cn.wjybxx.dson.io;
import cn.wjybxx.base.io.ByteBufferUtils;
import cn.wjybxx.base.mutable.MutableInt;
import cn.wjybxx.dson.internal.CodedUtils;
import java.nio.charset.StandardCharsets;
/**
* 核心包去除了对Protobuf的支持，如果期望使用protobuf和netty读取数据，可引入相应的扩展包。
*
* @author wjybxx
* date - 2023/4/22
*/
public class DsonInputs {
public static DsonInput newInstance(byte[] buffer) {
return new ArrayDsonInput(buffer, 0, buffer.length);
}
public static DsonInput newInstance(byte[] buffer, int offset, int length) {
return new ArrayDsonInput(buffer, offset, length);
}
static class ArrayDsonInput implements DsonInput {
private final byte[] buffer;
private final int rawOffset;
private final int rawLimit;
private int bufferPos;
private int bufferPosLimit;
private final MutableInt newPos = new MutableInt();
ArrayDsonInput(byte[] buffer, int offset, int length) {
ByteBufferUtils.checkBuffer(buffer, offset, length);
this.buffer = buffer;
this.rawOffset = offset;
this.rawLimit = offset + length;
this.bufferPos = offset;
this.bufferPosLimit = offset + length;
}
// region check
private int checkNewBufferPos(int newBufferPos) {
if (newBufferPos < rawOffset || newBufferPos > bufferPosLimit) {
throw new DsonIOException("BytesLimited, LimitPos: %d, position: %d, newPosition: %d"
.formatted(bufferPosLimit, bufferPos, newBufferPos));
}
return newBufferPos;
}
//endregion
// region basic
@Override
public byte readRawByte() {
checkNewBufferPos(bufferPos + 1);
return buffer[bufferPos++];
}
@Override
public int readInt32() {
try {
int r = CodedUtils.readInt32(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public int readUint32() {
try {
int r = CodedUtils.readUint32(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public int readSint32() {
try {
int r = CodedUtils.readSint32(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public int readFixed32() {
try {
int r = CodedUtils.readFixed32(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public long readInt64() {
try {
long r = CodedUtils.readInt64(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public long readUint64() {
try {
long r = CodedUtils.readUint64(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public long readSint64() {
try {
long r = CodedUtils.readSint64(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public long readFixed64() {
try {
long r = CodedUtils.readFixed64(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public float readFloat() {
try {
float r = CodedUtils.readFloat(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public double readDouble() {
try {
double r = CodedUtils.readDouble(buffer, bufferPos, newPos);
bufferPos = checkNewBufferPos(newPos.getValue());
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public boolean readBool() {
checkNewBufferPos(bufferPos + 1);
return buffer[bufferPos++] != 0;
}
@Override
public String readString() {
try {
int len = CodedUtils.readUint32(buffer, bufferPos, newPos); // 字符串长度
checkNewBufferPos(newPos.getValue() + len); // 先检查，避免构建无效字符串
String r = new String(buffer, newPos.getValue(), len, StandardCharsets.UTF_8);
bufferPos = newPos.getValue() + len;
return r;
} catch (Exception e) {
throw DsonIOException.wrap(e, "buffer overflow");
}
}
@Override
public byte[] readRawBytes(int count) {
checkNewBufferPos(bufferPos + count);
byte[] bytes = new byte[count];
System.arraycopy(buffer, bufferPos, bytes, 0, count);
bufferPos += count;
return bytes;
}
@Override
public void skipRawBytes(int n) {
if (n < 0) throw new IllegalArgumentException("n");
if (n == 0) return;
bufferPos = checkNewBufferPos(bufferPos + n);
}
// endregion
//region sp
@Override
public int getPosition() {
return bufferPos - rawOffset;
}
@Override
public void setPosition(int value) {
ByteBufferUtils.checkBuffer(rawLimit - rawOffset, value);
bufferPos = rawOffset + value;
}
@Override
public byte getByte(int pos) {
ByteBufferUtils.checkBuffer(rawLimit - rawOffset, pos, 1);
int bufferPos = rawOffset + pos;
return buffer[bufferPos];
}
@Override
public int getFixed32(int pos) {
ByteBufferUtils.checkBuffer(rawLimit - rawOffset, pos, 4);
int bufferPos = rawOffset + pos;
return ByteBufferUtils.getInt32LE(buffer, bufferPos);
}
@Override
public int pushLimit(int byteLimit) {
if (byteLimit < 0) throw new IllegalArgumentException("byteLimit");
int oldPosLimit = bufferPosLimit;
int newPosLimit = bufferPos + byteLimit;
// 不可超过原始限制
ByteBufferUtils.checkBuffer(rawLimit, rawOffset, newPosLimit - rawOffset);
bufferPosLimit = newPosLimit;
return oldPosLimit;
}
@Override
public void popLimit(int oldLimit) {
// 不可超过原始限制
ByteBufferUtils.checkBuffer(rawLimit, rawOffset, oldLimit - rawOffset);
bufferPosLimit = oldLimit;
}
@Override
public int getBytesUntilLimit() {
return (bufferPosLimit - bufferPos);
}
@Override
public boolean isAtEnd() {
return bufferPos >= bufferPosLimit;
}
@Override
public void close() {
}
}
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