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copied!<p>I agree with Cheeso's answer however if the Input file size is greater than 2GB then byte[] buffer = File.ReadAllBytes(pathname); will throw an IO exception. So i modified Cheeso code and it works like a charm for all the files.</p> <h2>.</h2> <pre><code> long maxDataToBuffer = 104857600;//100MB using (var outStream = new FileStream("Out3.zip", FileMode.Create)) { using (var zipStream = new ZipOutputStream(outStream)) { Crc32 crc = new Crc32(); foreach (string pathname in pathnames) { tempBuffLength = maxDataToBuffer; FileStream fs = System.IO.File.OpenRead(pathname); ZipEntry entry = new ZipEntry(Path.GetFileName(pathname)); entry.DateTime = now; entry.Size = buffer.Length; crc.Reset(); long totalBuffLength = 0; if (fs.Length <= tempBuffLength) tempBuffLength = fs.Length; byte[] buffer = null; while (totalBuffLength < fs.Length) { if ((fs.Length - totalBuffLength) <= tempBuffLength) tempBuffLength = (fs.Length - totalBuffLength); totalBuffLength += tempBuffLength; buffer = new byte[tempBuffLength]; fs.Read(buffer, 0, buffer.Length); crc.Update(buffer, 0, buffer.Length); buffer = null; } entry.Crc = crc.Value; zipStream.PutNextEntry(entry); tempBuffLength = maxDataToBuffer; fs = System.IO.File.OpenRead(pathname); totalBuffLength = 0; if (fs.Length <= tempBuffLength) tempBuffLength = fs.Length; buffer = null; while (totalBuffLength < fs.Length) { if ((fs.Length - totalBuffLength) <= tempBuffLength) tempBuffLength = (fs.Length - totalBuffLength); totalBuffLength += tempBuffLength; buffer = new byte[tempBuffLength]; fs.Read(buffer, 0, buffer.Length); zipStream.Write(buffer, 0, buffer.Length); buffer = null; } fs.Close(); } zipStream.Finish(); // I dont think this is required at all zipStream.Flush(); zipStream.Close(); } } </code></pre>

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