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Hprose is a High Performance Remote Object Service Engine. It is a modern, lightweight, cross-language, cross-platform, object-oriented, high performance, remote dynamic communication middleware. It is not only easy to use, but powerful. You just need a little time to learn, then you can use it to easily construct cross language cross platform distributed application system. Hprose supports many programming languages, for example: * AAuto Quicker * ActionScript * ASP * C++ * Dart * Delphi/Free Pascal * dotNET(C#, Visual Basic...) * Golang * Java * JavaScript * Node.js * Objective-C * Perl * PHP * Python * Ruby * ... Through Hprose, You can conveniently and efficiently intercommunicate between those programming languages. This project is the implementation of Hprose for Java.

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/**********************************************************\
|                                                          |
|                          hprose                          |
|                                                          |
| Official WebSite: http://www.hprose.com/                 |
|                   http://www.hprose.org/                 |
|                                                          |
\**********************************************************/
/**********************************************************\
 *                                                        *
 * BigIntegerUnserializer.java                            *
 *                                                        *
 * BigInteger unserializer class for Java.                *
 *                                                        *
 * LastModified: Apr 17, 2016                             *
 * Author: Ma Bingyao                   *
 *                                                        *
\**********************************************************/

package hprose.io.unserialize;

import static hprose.io.HproseTags.TagDate;
import static hprose.io.HproseTags.TagDouble;
import static hprose.io.HproseTags.TagEmpty;
import static hprose.io.HproseTags.TagFalse;
import static hprose.io.HproseTags.TagInteger;
import static hprose.io.HproseTags.TagLong;
import static hprose.io.HproseTags.TagNull;
import static hprose.io.HproseTags.TagRef;
import static hprose.io.HproseTags.TagString;
import static hprose.io.HproseTags.TagTime;
import static hprose.io.HproseTags.TagTrue;
import static hprose.io.HproseTags.TagUTF8Char;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.math.BigInteger;
import java.nio.ByteBuffer;

final class BigIntegerUnserializer implements Unserializer {

    public final static BigIntegerUnserializer instance = new BigIntegerUnserializer();

    final static BigInteger read(Reader reader, ByteBuffer buffer) throws IOException {
        int tag = buffer.get();
        if (tag == TagLong) ValueReader.readBigInteger(buffer);
        if (tag == TagNull) return null;
        if (tag == TagInteger) return BigInteger.valueOf(ValueReader.readInt(buffer));
        if (tag >= '0' && tag <= '9') return BigInteger.valueOf(tag - '0');
        switch (tag) {
            case TagDouble: return BigInteger.valueOf(Double.valueOf(ValueReader.readDouble(buffer)).longValue());
            case TagEmpty: return BigInteger.ZERO;
            case TagTrue: return BigInteger.ONE;
            case TagFalse: return BigInteger.ZERO;
            case TagDate: return DefaultUnserializer.readDateTime(reader, buffer).toBigInteger();
            case TagTime: return DefaultUnserializer.readTime(reader, buffer).toBigInteger();
            case TagUTF8Char: return new BigInteger(ValueReader.readUTF8Char(buffer));
            case TagString: return new BigInteger(StringUnserializer.readString(reader, buffer));
            case TagRef: return new BigInteger(reader.readRef(buffer, String.class));
            default: throw ValueReader.castError(reader.tagToString(tag), BigInteger.class);
        }
    }

    final static BigInteger read(Reader reader, InputStream stream) throws IOException {
        int tag = stream.read();
        if (tag == TagLong) ValueReader.readBigInteger(stream);
        if (tag == TagNull) return null;
        if (tag == TagInteger) return BigInteger.valueOf(ValueReader.readInt(stream));
        if (tag >= '0' && tag <= '9') return BigInteger.valueOf(tag - '0');
        switch (tag) {
            case TagDouble: return BigInteger.valueOf(Double.valueOf(ValueReader.readDouble(stream)).longValue());
            case TagEmpty: return BigInteger.ZERO;
            case TagTrue: return BigInteger.ONE;
            case TagFalse: return BigInteger.ZERO;
            case TagDate: return DefaultUnserializer.readDateTime(reader, stream).toBigInteger();
            case TagTime: return DefaultUnserializer.readTime(reader, stream).toBigInteger();
            case TagUTF8Char: return new BigInteger(ValueReader.readUTF8Char(stream));
            case TagString: return new BigInteger(StringUnserializer.readString(reader, stream));
            case TagRef: return new BigInteger(reader.readRef(stream, String.class));
            default: throw ValueReader.castError(reader.tagToString(tag), BigInteger.class);
        }
    }

    public final Object read(Reader reader, ByteBuffer buffer, Class cls, Type type) throws IOException {
        return read(reader, buffer);
    }

    public final Object read(Reader reader, InputStream stream, Class cls, Type type) throws IOException {
        return read(reader, stream);
    }

}