fix: 改用小端字节序解析

src/main/java/com/xydl/cac/model/spectrogram/SouthYsp.java

@@ -23,28 +23,24 @@ public class SouthYsp extends SpectrogramModel {
     List<SouthYspChannel> channels = new ArrayList<>();
 
     public void readFrom(DataInputStream dis) throws Exception {
-        version = dis.readFloat();
-        fileVersion = dis.readFloat();
-        type = dis.readShort();
-        createTime = dis.readLong();
+        version = readLittleEndianFloat(dis);
+        fileVersion = readLittleEndianFloat(dis);
+        type = readLittleEndianShort(dis);
+        createTime = readLittleEndianLong(dis);
         flag = dis.read();
-        StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < 32; i++) {
-            char c = (char) dis.readByte();
-            sb.append(c);
-        }
-        name = sb.toString();
-        xInterval = dis.readFloat();
-        yMax = dis.readFloat();
+        name = readString(dis, 32);
+        xInterval = readLittleEndianFloat(dis);
+        yMax = readLittleEndianFloat(dis);
         xUnit = dis.read();
         yUnit = dis.read();
-        k = dis.readInt();
+        k = readLittleEndianInt(dis);
         m = dis.read();
         for (int i = 0; i < m; i++) {
             SouthYspChannel channel = new SouthYspChannel();
             channel.readFrom(dis);
             channels.add(channel);
         }
+        dis.readInt();
         for (SouthYspChannel channel : channels) {
             channel.readDataFrom(dis, k);
         }

src/main/java/com/xydl/cac/model/spectrogram/SouthYspChannel.java

@@ -6,6 +6,8 @@ import java.io.DataInputStream;
 import java.util.ArrayList;
 import java.util.List;
 
+import static com.xydl.cac.model.spectrogram.SpectrogramModel.readLittleEndianFloat;
+
 @Data
 public class SouthYspChannel {
     Integer n;
@@ -23,7 +25,7 @@ public class SouthYspChannel {
 
     public void readDataFrom(DataInputStream dis, Integer k) throws Exception {
         for (int i = 0; i < k; i++) {
-            Float v = dis.readFloat();
+            Float v = readLittleEndianFloat(dis);
             data.add(v);
         }
     }

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

@@ -2,6 +2,56 @@ 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", "");
+    }
 }

src/main/java/com/xydl/cac/model/spectrogram/Ysp.java

@@ -22,14 +22,14 @@ public class Ysp extends SpectrogramModel {
 
     public void readFrom(DataInputStream dis) throws Exception {
         code = dis.read();
-        length = dis.readInt();
-        createTime = dis.readLong();
+        length = readLittleEndianInt(dis);
+        createTime = readLittleEndianLong(dis);
         flag = dis.read();
-        xInterval = dis.readFloat();
-        yMax = dis.readFloat();
+        xInterval = readLittleEndianFloat(dis);
+        yMax = readLittleEndianFloat(dis);
         xUnit = dis.read();
         yUnit = dis.read();
-        k = dis.readInt();
+        k = readLittleEndianInt(dis);
         m = dis.read();
         for (int i = 0; i < m; i++) {
             YspChannel channel = new YspChannel();

src/main/java/com/xydl/cac/model/spectrogram/YspChannel.java

@@ -6,6 +6,8 @@ import java.io.DataInputStream;
 import java.util.ArrayList;
 import java.util.List;
 
+import static com.xydl.cac.model.spectrogram.SpectrogramModel.readLittleEndianFloat;
+
 @Data
 public class YspChannel {
     Integer n;
@@ -20,7 +22,7 @@ public class YspChannel {
             crests.add(crest);
         }
         for (int i = 0; i < k; i++) {
-            Float v = dis.readFloat();
+            Float v = readLittleEndianFloat(dis);
             data.add(v);
         }
     }

src/main/java/com/xydl/cac/model/spectrogram/YspChannelCrest.java

@@ -4,6 +4,8 @@ import lombok.Data;
 
 import java.io.DataInputStream;
 
+import static com.xydl.cac.model.spectrogram.SpectrogramModel.*;
+
 @Data
 public class YspChannelCrest {
     String name;
@@ -15,17 +17,12 @@ public class YspChannelCrest {
     Float area;
 
     public void readFrom(DataInputStream dis) throws Exception {
-        StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < 10; i++) {
-            char c = (char) dis.readByte();
-            sb.append(c);
-        }
-        name = sb.toString();
+        name = readString(dis, 10);
         j = dis.read();
-        time = dis.readFloat();
-        startTime = dis.readFloat();
-        endTime = dis.readFloat();
-        height = dis.readFloat();
-        area = dis.readFloat();
+        time = readLittleEndianFloat(dis);
+        startTime = readLittleEndianFloat(dis);
+        endTime = readLittleEndianFloat(dis);
+        height = readLittleEndianFloat(dis);
+        area = readLittleEndianFloat(dis);
     }
 }