73 lines
3.0 KiB
C#
73 lines
3.0 KiB
C#
using System;
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using FileCompression.Interfaces;
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using System.IO;
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using System.IO.Compression;
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using System.Collections.Generic;
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using FileCompression.Utils;
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namespace FileCompression.Services.Strategies;
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public class ZipStrategy : ICompressionStrategy
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{
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public void CompressFile(string sourcePath, string destinationPath, string basePath)
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{
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Console.WriteLine($"Compressing file {sourcePath} to {destinationPath}");
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using (Stream destination = new FileStream(destinationPath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
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{
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using ZipArchive archive = new ZipArchive(destination, ZipArchiveMode.Update);
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string entryName = ArchiveUtils.EntryFromPath(sourcePath.AsSpan(basePath.Length));
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DoCreateEntryFromFile(archive, sourcePath, entryName, CompressionLevel.Optimal);
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}
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}
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public void CompressDirectory(string sourcePath, string destinationPath, string basePath)
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{
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Console.WriteLine($"Compressing directory {sourcePath} to {destinationPath}");
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using (Stream destination = new FileStream(destinationPath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
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{
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using ZipArchive archive = new ZipArchive(destination, ZipArchiveMode.Update);
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string entryName = ArchiveUtils.EntryFromPath(sourcePath.AsSpan(basePath.Length), appendPathSeparator: true);
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archive.CreateEntry(entryName);
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}
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}
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private ZipArchiveEntry DoCreateEntryFromFile(ZipArchive destination,
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string sourceFileName, string entryName, CompressionLevel? compressionLevel)
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{
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ArgumentNullException.ThrowIfNull(destination);
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ArgumentNullException.ThrowIfNull(sourceFileName);
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ArgumentNullException.ThrowIfNull(entryName);
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// Checking of compressionLevel is passed down to DeflateStream and the IDeflater implementation
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// as it is a pluggable component that completely encapsulates the meaning of compressionLevel.
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// Argument checking gets passed down to FileStream's ctor and CreateEntry
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using (FileStream fs = new FileStream(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 0x1000, useAsync: false))
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{
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ZipArchiveEntry entry = compressionLevel.HasValue
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? destination.CreateEntry(entryName, compressionLevel.Value)
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: destination.CreateEntry(entryName);
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DateTime lastWrite = File.GetLastWriteTime(sourceFileName);
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// If file to be archived has an invalid last modified time, use the first datetime representable in the Zip timestamp format
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// (midnight on January 1, 1980):
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if (lastWrite.Year < 1980 || lastWrite.Year > 2107)
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lastWrite = new DateTime(1980, 1, 1, 0, 0, 0);
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entry.LastWriteTime = lastWrite;
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using (Stream es = entry.Open())
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fs.CopyTo(es);
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return entry;
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}
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}
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}
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