71 lines
2.4 KiB
C#
71 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using DamienG.Security.Cryptography;
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namespace NetDisk
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{
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public static class UploadHelper
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{
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public static FileProperty GetFileProperty(string path)
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{
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var ret = new FileProperty() { path = path };
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var info = new FileInfo(path);
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ret.size = info.Length;
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ret.mtime= (long)(info.LastAccessTime.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
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ret.md5 = GetMD5HashFromFile(path);
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using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
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{
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var md5 = new MD5CryptoServiceProvider();
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var arr = new byte[4 * 1024 * 1024];
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var len = fs.Read(arr, 0, 256 * 1024);
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ret.slice_md5 = ByteArrayToHexString(md5.ComputeHash(arr, 0, len));
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fs.Seek(0, SeekOrigin.Begin);
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var blocks = new List<string>();
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while (true)
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{
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len = fs.Read(arr, 0, 4 * 1024 * 1024);
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if (len <= 0) break;
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blocks.Add(ByteArrayToHexString(md5.ComputeHash(arr, 0, len)));
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}
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ret.blocks = blocks.ToArray();
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fs.Seek(0, SeekOrigin.Begin);
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var crc32 = new Crc32();
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ret.crc32 = string.Empty;
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foreach (byte b in crc32.ComputeHash(fs)) ret.crc32 += b.ToString("x2").ToLower();
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}
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return ret;
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}
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public static string GetMD5HashFromFile(string fileName)
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{
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using (var file = new FileStream(fileName, FileMode.Open))
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{
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var md5 = new MD5CryptoServiceProvider();
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var retVal = md5.ComputeHash(file);
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return ByteArrayToHexString(retVal);
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}
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}
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private static string ByteArrayToHexString(byte[] arr)
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{
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var sb = new StringBuilder();
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for (int i = 0; i < arr.Length; i++)
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{
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sb.Append(arr[i].ToString("x2"));
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}
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return sb.ToString();
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}
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}
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public class FileProperty
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{
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public string path;
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public long size;
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public string md5;
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public string slice_md5;
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public string crc32;
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public long mtime;
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public string[] blocks;
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}
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}
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