100 lines
2.7 KiB
Dart
100 lines
2.7 KiB
Dart
// ignore_for_file: constant_identifier_names
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:hgdj/extension/extensions.dart';
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import 'package:hgdj/hj_utils/text_util.dart';
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import 'package:hgdj/tools_base/debug_log.dart';
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const KB_SIZE = 1024;
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const MB_SIZE = 1024 * KB_SIZE;
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const GB_SIZE = 1024 * MB_SIZE;
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/// 文件相关的公共处理
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class FileUtil {
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/// 计算切片个数
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static int getPatchCount(int fileLen) {
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final cutSize = getPatchSize(fileLen);
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return (fileLen + cutSize - 1) ~/ cutSize;
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}
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/// 根据文件长度计算切片大小
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static int getPatchSize(int fileLen) {
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if (fileLen < MB_SIZE) return MB_SIZE;
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return 2 * MB_SIZE;
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}
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/// 文件是否存在
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static bool isFileExist(String path) {
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return TextUtil.isNotEmpty(path) && File(path).existsSync();
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}
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/// 获取 file 从 offset 之后到 blockSize 的数据块
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/// [offset] 起始偏移位置
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/// [blockSize] 分块大小
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/// [file] 文件
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static Future<Uint8List> getFileBlock(
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int offset, int blockSize, File file) async {
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RandomAccessFile? accessFile;
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try {
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accessFile = await file.open();
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await accessFile.setPosition(offset);
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debugLog('offset:$offset blocksize:$blockSize');
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return await accessFile.read(blockSize);
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} on Exception {
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return Uint8List(0);
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} finally {
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accessFile?.close();
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}
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}
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/// 获取文件长度
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static int getFileSize(String path) {
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if (!isFileExist(path)) return 0;
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return File(path).lengthSync();
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}
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/// 获取文件的格式化大小
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static String byteFmt(int size) {
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if (size > GB_SIZE) {
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return '${(size / GB_SIZE).toStringAsFixed(1)}GB';
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} else if (size > MB_SIZE) {
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return '${(size / MB_SIZE).toStringAsFixed(1)}MB';
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} else {
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return '${(size / KB_SIZE).toStringAsFixed(1)}KB';
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}
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}
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/// 获取文件名带后缀
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/// 支持 url/uri/file/abspath
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static String getName(String absPath) {
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if (TextUtil.isEmpty(absPath)) return absPath;
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absPath = Uri.parse(absPath).path;
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final start = absPath.lastIndexOf('/');
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if (start <= 0 || start == absPath.length - 1) {
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return absPath;
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}
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return absPath.substring(start + 1);
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}
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/// 获取文件名不带后缀
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static String getNamePrefix(String absPath) {
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final name = getName(absPath);
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if (TextUtil.isEmpty(name)) return name;
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final ar = name.split('.');
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if (ar.empty()) return name;
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return ar[0];
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}
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/// 获取文件名后缀 (fileExtension)
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static String getNameSuffix(String absPath) {
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final name = getName(absPath);
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if (TextUtil.isEmpty(name)) return name;
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final ar = name.split('.');
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if (ar.empty()) return name;
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if (ar.length < 2) return ar[0];
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return ar.last;
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}
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}
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