backend/src/main/java/com/xydl/cac/model/spectrogram/SpectrogramModel.java

package com.xydl.cac.model.spectrogram;

import lombok.Data;

import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;

@Data
public class SpectrogramModel {

    // 读取小端序的int（4字节）
    public static int readLittleEndianInt(DataInputStream dis) throws IOException {
        byte[] bytes = new byte[4];
        dis.readFully(bytes);
        return ByteBuffer.wrap(bytes)
                .order(ByteOrder.LITTLE_ENDIAN)
                .getInt();
    }

    // 读取小端序的short（2字节）
    public static short readLittleEndianShort(DataInputStream dis) throws IOException {
        byte[] bytes = new byte[2];
        dis.readFully(bytes);
        return ByteBuffer.wrap(bytes)
                .order(ByteOrder.LITTLE_ENDIAN)
                .getShort();
    }

    // 读取小端序的long（8字节）
    public static long readLittleEndianLong(DataInputStream dis) throws IOException {
        byte[] bytes = new byte[8];
        dis.readFully(bytes);
        return ByteBuffer.wrap(bytes)
                .order(ByteOrder.LITTLE_ENDIAN)
                .getLong();
    }

    // 读取小端序的float（4字节）
    public static float readLittleEndianFloat(DataInputStream dis) throws IOException {
        byte[] bytes = new byte[4];
        dis.readFully(bytes);
        return ByteBuffer.wrap(bytes)
                .order(ByteOrder.LITTLE_ENDIAN)
                .getFloat();
    }

    // 读取String
    public static String readString(DataInputStream dis, int length) throws IOException {
        byte[] bytes = new byte[length];
        dis.readFully(bytes);
        String str = new String(bytes, StandardCharsets.UTF_8);
        return str.replaceAll("\u0000", "");
    }
}