1/1/2023 0 Comments Base64 encoding size increase![]() You need to change the value on the Client Access web site and the back end web site. ![]() To change the maxAllowedContentLength value, enter a new value in bytes, and click Apply. In the results, expand requestLimits, and you'll see maxAllowedContentLength and the default value 30000000 (bytes). Verify the Features View tab is selected at the bottom, and double-click Configuration Editor in the Management section.Ĭlick the drop down arrow in the Section field, navigate to system.webServer > security and select requestFiltering. To see these values for ActiveSync on Mailbox servers in IIS Manager, perform the following steps:įor the Client Access (frontend) web site, open IIS Manager, navigate to Sites > Default Web Site and select Microsoft-Server-ActiveSync.įor the backend web site, open IIS Manager, navigate to Sites > Exchange Back End and select Microsoft-Server-ActiveSync. However, the maximum message size for ActiveSync is affected by the maxAllowedContentLength value that is applied to all web sites on the server. MaxAllowedContentLength="30000000 bytes" (not present by default see comments)īy default, there is no maxAllowedContentLength key in the web.config files for ActiveSync. ![]() %ExchangeInstallPath%ClientAccess\Sync\web.config MaxAllowedContentLength="30000000" (not present by default see comments) %ExchangeInstallPath%FrontEnd\HttpProxy\Sync\web.config For example, if you specify a maximum message size value of 64 MB, you can expect a realistic maximum message size of approximately 48 MB. Base64 encoding increases the size of the message by approximately 33%, so the value you specify should be approximately 33% larger than the actual message size you want enforced. This accounts for the Base64 encoding of attachments and other binary data. Base64 adds padding using the '=' character.For any message size limit, you need to set a value that's larger than the actual size you want enforced. This is almost correct, except: what if the length of the data doesn't nicely line up to a multitude of 3? Then you cannot get a nice set of four 6-bit numbers. For each of those sets, you know you have 3 bytes of original data 3 * (LengthInCharacters / 4) = length in bytes To calculate the length of the original data, you must count how many sets of 4 characters are in the Base64 string. So four characters of base64 represent 3 bytes of data. A 6-bit number can represent 64 possible value.Įach possible value corresponds to an ascii character. To encode, it splits up the three bytes into 4 6-bit numbers. The input is a set of bytes: īase64 uses 4 ascii characters to encode 24-bits (3 bytes) of data. To know the length of the original data, we must understand how Base64 works. Putting binary data inside an xml file, for example, could act weird, but a Base64 string acts just like normal text.Ī base64 string looks like this: TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4= The goal is to make it easier to transfer. Return (3 * (characterCount / 4)) - paddingCount īase64 is a way to encode binary data in ascii data. Var paddingCount = base64string.Substring(characterCount - 2, 2) Var characterCount = base64string.Length Here's a function in C#: public int GetOriginalLengthInBytes(string base64string) To get the length of bytes we use the formula: (3 * (LengthInCharacters / 4)) - (numberOfPaddingCharacters) Sometimes, padding is added in the form of one or two '=' characters. A question was posed today: can I get the exact length in bytes of the input data, if I have a Base64 string?īase64 encodes three bytes to four characters. ![]()
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