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ElwigData: Check zip file integrity
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This commit is contained in:
Lorenz Stechauner
2025-08-06 12:31:19 +02:00
parent 73fe4531cc
commit d3157e4d48
5 changed files with 21 additions and 5 deletions
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4
Elwig/Helpers/Export/ElwigData.cs
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@@ -75,6 +75,7 @@ namespace Elwig.Helpers.Export {
foreach (var filename in filenames) {
// TODO read encrypted files
using var zip = ZipFile.Open(filename, ZipArchiveMode.Read);
await zip.CheckIntegrity();
var version = zip.GetEntry("version");
using (var reader = new StreamReader(version!.Open(), Utils.UTF8)) {
@@ -370,11 +371,12 @@ namespace Elwig.Helpers.Export {
}.Export(filename);
}
public static void ImportDatabase(string filename) {
public static async Task ImportDatabase(string filename) {
var oldName = Path.ChangeExtension(App.Config.DatabaseFile, ".old.sqlite3");
var newName = Path.ChangeExtension(App.Config.DatabaseFile, ".new.sqlite3");
try {
using (var zip = ZipFile.Open(filename, ZipArchiveMode.Read)) {
await zip.CheckIntegrity();
var db = zip.GetEntry("database.sqlite3")!;
db.ExtractToFile(newName, true);
}

13
Elwig/Helpers/Extensions.cs
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@@ -1,5 +1,7 @@
using System;
using System.IO;
using System.IO.Compression;
using System.IO.Hashing;
using System.Net.Http;
using System.Runtime.InteropServices;
using System.Threading;
@@ -95,5 +97,16 @@ namespace Elwig.Helpers {
await download.CopyToAsync(destination, 81920, relativeProgress, cancellationToken);
progress.Report(100.0);
}
public static async Task CheckIntegrity(this ZipArchive zip) {
var crc = new Crc32();
foreach (var entry in zip.Entries) {
crc.Reset();
using var stream = entry.Open();
await crc.AppendAsync(stream);
if (crc.GetCurrentHashAsUInt32() != entry.Crc32)
throw new InvalidDataException($"CRC-32 mismatch in '{entry.FullName}'");
}
}
}
}