progress on string utils tests

src/common/StringUtilsTestCase.rs

@@ -0,0 +1,120 @@
+/*
+ * Copyright 2012 ZXing authors
+ *
+ * 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 com.google.zxing.common;
+
+// import org.junit.Assert;
+// import org.junit.Test;
+
+// import java.nio.charset.Charset;
+// import java.nio.charset.StandardCharsets;
+// import java.util.Random;
+
+use rand::{Rng};
+use encoding::{Encoding};
+use std::{collections::HashMap, hash::Hash};
+
+use crate::common::StringUtils;
+
+  #[test]
+  fn testRandom() {
+    let mut r = rand::thread_rng();
+    let bytes : Vec<u8> = vec![0;1000];
+    for i in 0..bytes.len() {
+      bytes[i] = r.gen();
+    }
+    assert_eq!(encoding::all::UTF_8.name(), StringUtils::guessCharset(&bytes, HashMap::new()).name());
+  }
+
+  #[test]
+  fn testShortShiftJIS1() {
+    // 金魚
+    doTest(&vec![ 0x8b,  0xe0,  0x8b,  0x9b, ], encoding::label::encoding_from_whatwg_label("SJIS").unwrap(), "SJIS");
+  }
+
+  #[test]
+  fn testShortISO885911() {
+    // båd
+    doTest(new byte[] { (byte) 0x62, (byte) 0xe5, (byte) 0x64, }, StandardCharsets.ISO_8859_1, "ISO8859_1");
+  }
+
+  #[test]
+  fn  testShortUTF81() {
+    // Español
+    doTest(new byte[] { (byte) 0x45, (byte) 0x73, (byte) 0x70, (byte) 0x61, (byte) 0xc3,
+                        (byte) 0xb1, (byte) 0x6f, (byte) 0x6c },
+           StandardCharsets.UTF_8, "UTF8");
+  }
+
+  #[test]
+  fn testMixedShiftJIS1() {
+    // Hello 金!
+    doTest(new byte[] { (byte) 0x48, (byte) 0x65, (byte) 0x6c, (byte) 0x6c, (byte) 0x6f,
+                        (byte) 0x20, (byte) 0x8b, (byte) 0xe0, (byte) 0x21, },
+           StringUtils.SHIFT_JIS_CHARSET, "SJIS");
+  }
+
+  #[test]
+  fn testUTF16BE() {
+    // 调压柜
+    doTest(new byte[] { (byte) 0xFE, (byte) 0xFF, (byte) 0x8c, (byte) 0x03, (byte) 0x53, (byte) 0x8b,
+                        (byte) 0x67, (byte) 0xdc, },
+           StandardCharsets.UTF_16,
+           StandardCharsets.UTF_16.name());
+  }
+
+  #[test]
+  fn testUTF16LE() {
+    // 调压柜
+    doTest(new byte[] { (byte) 0xFF, (byte) 0xFE, (byte) 0x03, (byte) 0x8c, (byte) 0x8b, (byte) 0x53,
+                        (byte) 0xdc, (byte) 0x67, },
+           StandardCharsets.UTF_16,
+           StandardCharsets.UTF_16.name());
+  }
+
+  fn doTest(bytes :&Vec<u8>,  charset : &dyn Encoding,  encoding: &str) {
+    let guessedCharset = StringUtils::guessCharset(bytes, HashMap::new());
+    let guessedEncoding = StringUtils::guessEncoding(bytes, HashMap::new());
+    assert_eq!(charset.name(), guessedCharset.name());
+    assert_eq!(encoding, guessedEncoding);
+  }
+
+  /**
+   * Utility for printing out a string in given encoding as a Java statement, since it's better
+   * to write that into the Java source file rather than risk character encoding issues in the
+   * source file itself.
+   *
+   * @param args command line arguments
+   */
+  fn main(String[] args) {
+    String text = args[0];
+    Charset charset = Charset.forName(args[1]);
+    StringBuilder declaration = new StringBuilder();
+    declaration.append("new byte[] { ");
+    for (byte b : text.getBytes(charset)) {
+      declaration.append("(byte) 0x");
+      int value = b & 0xFF;
+      if (value < 0x10) {
+        declaration.append('0');
+      }
+      declaration.append(Integer.toHexString(value));
+      declaration.append(", ");
+    }
+    declaration.append('}');
+    System.out.println(declaration);
+  }
+
+// }