自动探测日志文件编码 (#3863)

HMCLCore/build.gradle.kts

@@ -16,6 +16,7 @@ dependencies {
     api("com.github.steveice10:opennbt:1.5")
     api("org.nanohttpd:nanohttpd:2.3.1")
     api("org.jsoup:jsoup:1.19.1")
+    api("org.glavo:chardet:2.5.0")
     compileOnlyApi("org.jetbrains:annotations:26.0.1")
 
     if (JavaVersion.current().isJava8) {

HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/IOUtils.java

@@ -17,10 +17,20 @@
  */
 package org.jackhuang.hmcl.util.io;
 
+import org.glavo.chardet.DetectedCharset;
+import org.glavo.chardet.UniversalDetector;
+
 import java.io.*;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
 import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.zip.GZIPInputStream;
 
+import static java.nio.charset.StandardCharsets.*;
+import static org.jackhuang.hmcl.util.platform.OperatingSystem.NATIVE_CHARSET;
+
 /**
  * This utility class consists of some util methods operating on InputStream/OutputStream.
  *
@@ -33,6 +43,25 @@ public final class IOUtils {
 
     public static final int DEFAULT_BUFFER_SIZE = 8 * 1024;
 
+    public static BufferedReader newBufferedReaderMaybeNativeEncoding(Path file) throws IOException {
+        if (NATIVE_CHARSET == UTF_8)
+            return Files.newBufferedReader(file);
+
+        FileChannel channel = FileChannel.open(file);
+        try {
+            long oldPosition = channel.position();
+            DetectedCharset detectedCharset = UniversalDetector.detectCharset(channel);
+            Charset charset = detectedCharset != null && detectedCharset.isSupported()
+                    && (detectedCharset.getCharset() == UTF_8 || detectedCharset.getCharset() == US_ASCII)
+                    ? UTF_8 : NATIVE_CHARSET;
+            channel.position(oldPosition);
+            return new BufferedReader(new InputStreamReader(Channels.newInputStream(channel), charset));
+        } catch (Throwable e) {
+            closeQuietly(channel, e);
+            throw e;
+        }
+    }
+
     /**
      * Read all bytes to a buffer from given input stream. The stream will not be closed.
      *