Initial commit: 91dj android client dev_1.0.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/tools_base/image/image_crypto.dart

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+import 'dart:typed_data';
+
+//图片解密：前 100 字节与 key 循环异或
+class ImageCrypto {
+  //jpg/png/gif 文件头，都对不上视为加密图
+  static final List<Uint8List> _featuresList = [
+    Uint8List.fromList([0xff, 0xd8, 0xff]), //jpg,jpeg
+    Uint8List.fromList([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]), //png
+    Uint8List.fromList([0x47, 0x49, 0x46]), //gif
+  ];
+
+  static const int _minLen = 6; //最小字节数
+  static const int _encryptedLen = 100; //加密图片的数据长度
+  static final Uint8List _decryptKey = Uint8List.fromList('2019ysapp7527'.codeUnits); //加密key
+
+  static Uint8List? decrypt(Uint8List? imgBytes) {
+    if (imgBytes?.isNotEmpty != true) {
+      return imgBytes;
+    }
+    //不足 6 字节视为坏图，抛给调用方走失败（沿用老逻辑比对 6 字节魔数时越界抛错的行为）
+    if (imgBytes!.length < _minLen) {
+      throw RangeError.range(imgBytes.length, 0, imgBytes.length - 1, 'length');
+    }
+    if (_isEncrypted(imgBytes)) {
+      imgBytes = _xor(imgBytes, _decryptKey, _encryptedLen);
+    }
+    return imgBytes;
+  }
+
+  static bool _isEncrypted(Uint8List imgBytes) {
+    bool isMismatch = false;
+    int featuresLen = _featuresList.length;
+    for (int i = 0; i < featuresLen; i++) {
+      isMismatch = false;
+      for (int j = 0; j < _featuresList[i].length; j++) {
+        if (_featuresList[i][j] != imgBytes[j]) {
+          isMismatch = true;
+          break;
+        }
+      }
+      if (isMismatch) {
+        continue;
+      } else {
+        break;
+      }
+    }
+    return isMismatch;
+  }
+
+  //前 length 字节与 key 循环异或（原地修改）
+  static Uint8List _xor(Uint8List src, Uint8List key, int length) {
+    int srcLen = src.length;
+    int keyLen = key.length;
+    if (length > srcLen || length <= 0) {
+      length = srcLen;
+    }
+    for (var i = 0; i < length; i += keyLen) {
+      for (var j = 0; j < keyLen && i + j < length; j++) {
+        src[i + j] ^= key[j];
+      }
+    }
+    return src;
+  }
+}

lib/tools_base/image/image_disk_cache.dart

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+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+
+import '../debug_log.dart';
+
+//图片磁盘缓存目录（2025-07 ~ 2026-06 的版本经 loadAndDecrypt 往里存过原图，当前无写入方，保留统计和清理给老用户兜底）
+class ImageDiskCache {
+  static Future<String> findSavePath() async {
+    final directory = await getTemporaryDirectory();
+
+    String saveDir = '${directory.path}/cacheImage';
+    Directory root = Directory(saveDir);
+    if (!root.existsSync()) {
+      debugLog(saveDir);
+      await root.create();
+    }
+    return saveDir;
+  }
+
+  static Future<void> emptyCache() async {
+    try {
+      String saveDir = await findSavePath();
+      Directory root = Directory(saveDir);
+      if (root.existsSync()) {
+        await root.delete(recursive: true);
+      }
+    } catch (e) {
+      debugLog(e);
+    }
+  }
+}