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copied!<p>This is possible.</p> <p>You should make it a binary (non-human-readable) file, and use the <code>BinaryWriter</code> and <code>BinaryReader</code> classes to read and write the lengths.</p> <p>You can read a file from it like this:</p> <pre><code>using (FileStream combinedFile = File.Open(...)) using (var binReader = new BinaryReader(combinedFile)) { while(!combinedFile.EOF) { long segmentLength = binReader.ReadInt64(); var bytes = new byte[segmentLength]; long totalRead = 0; while(bytesRead < segmentLength) { int read = combinedFile.Read(bytes, totalRead, Math.Min(4096, segmentLength - totalRead)); if (read == 0) throw new InvalidDataException(); } yield return new MemoryStream(bytes); } } </code></pre> <p><strong>EDIT</strong> To make a human-readable file, write the segment length as a fixed-length string (padded to some reasonable number of digits, such as 16), optionally followed by a newline. The maximum segment size is the length of the string.</p> <p>You can read a file from it like this:</p> <pre><code>const int LengthPadding = 16 using (FileStream combinedFile = File.Open(...)) using (var binReader = new BinaryReader(combinedFile)) { while(!combinedFile.EOF) { char[] segmentLengthChars = binReader.ReadChars(16); long segmentLength = long.Parse(new string(segmentLengthChars)); binReader.ReadChars(2); //Skip the newline var bytes = new byte[segmentLength]; long totalRead = 0; while(bytesRead < segmentLength) { int read = combinedFile.Read(bytes, totalRead, Math.Min(4096, segmentLength - totalRead)); if (read == 0) throw new InvalidDataException(); } yield return new MemoryStream(bytes); } } </code></pre> <p>To write the segment length, call</p> <pre><code>binWriter.WriteChars(length.ToString().PadLeft(16, '0').ToCharArray()); binWriter.WriteChars(new char[] { '\r', '\n' }); </code></pre> <p>You should explicitly pass an encoding and <code>CultureInfo.InvariantCulture</code> where applicable.</p>

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