[ { "Id": "207628", "ThreadId": "61221", "Html": "

Hi all,

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I'm a relatively new user of the DotNetZip library and I'm experiencing the following problem: When I try to zip a small file (eg. 3 bytes) and encrypt it as well I get the following error on the zip.Save statement:

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An attempt was made to move the position before the beginning of the stream. ()

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This error does not occur when the file content is larger or when the file is 0 bytes. However, when the size is zero bytes I don't seem to be able to open the file using the password. A 'CRC failed in encrypted file 'filename'. Wrong password ?' is generated. I'm sure the password is correct. When the file contains content this works ok.

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Thanks for any help or pointers.

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boris

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This is the code snippet I'm using:

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private static MemoryStream ZipAndEncryptReport(MemoryStream report, INotifierInstanceTemplate template, string filename)
{

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if (template.ZipReport && template.Type != TemplateType.EmailContent)
{
MemoryStream zippedStream = new MemoryStream();
ZipFile zip = new ZipFile();
report.Seek(0, SeekOrigin.Begin); <font size="2">\r\n

log.InfoFormat(

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"The output for the report <{0}> is zipped.", filename);<font size="2">\r\n

 

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if (template.EncryptReport)
{
log.InfoFormat("The output for the report <{0}> is encrypted with AES 256.", filename);<font size="2">\r\n

zip.Password = template.EncryptPassword;
zip.Encryption =

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EncryptionAlgorithm.WinZipAes256;
}<font size="2">\r\n

zip.AddFileStream(filename,

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"", report);
zip.Save(zippedStream);<font size="2">\r\n

 

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return zippedStream;
}<font size="2">\r\n

 

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}<font size="2">\r\n

 

\r\n</font>

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return report;

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}

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", "PostedDate": "2009-07-01T10:08:55.953-07:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "207667", "ThreadId": "61221", "Html": "This discussion has been copied to a work item. Click here to go to the work item and continue the discussion.", "PostedDate": "2009-07-01T11:39:10.523-07:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "207768", "ThreadId": "61221", "Html": "

Boris, I had an arithmetic error in the code. Can you try v1.8.4.1 ?

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", "PostedDate": "2009-07-01T17:49:24.097-07:00", "UserRole": null, "MarkedAsAnswerDate": null } ]