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Fix div-by-zero errors on files which don't have any changed content #7

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merged 1 commit into from
Dec 7, 2020
Merged

Fix div-by-zero errors on files which don't have any changed content #7

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18 changes: 12 additions & 6 deletions src/Squirrel/BinaryPatchUtility.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -230,21 +230,27 @@ static void CreateInternal(byte[] oldData, byte[] newData, Stream output)
WriteInt64(controlEndPosition - startPosition - c_headerSize, header, 8);

// write compressed diff data
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (var bz2Stream = new BZip2Stream(wrappingStream, CompressionMode.Compress))
if (dblen > 0)
{
bz2Stream.Write(db, 0, dblen);
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (var bz2Stream = new BZip2Stream(wrappingStream, CompressionMode.Compress))
{
bz2Stream.Write(db, 0, dblen);
}
}

// compute size of compressed diff data
long diffEndPosition = output.Position;
WriteInt64(diffEndPosition - controlEndPosition, header, 16);

// write compressed extra data
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (var bz2Stream = new BZip2Stream(wrappingStream, CompressionMode.Compress))
if (eblen > 0)
{
bz2Stream.Write(eb, 0, eblen);
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (var bz2Stream = new BZip2Stream(wrappingStream, CompressionMode.Compress))
{
bz2Stream.Write(eb, 0, eblen);
}
}

// seek to the beginning, write the header, then seek back to end
Expand Down