"The code is exactly
how I would like to write code and the algorithms used are very
efficient and well-documented."
Van T. Dinh, Microsoft MVP
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Class: CUUEncode
Class that encodes and decodes files using UU Encoding.
UU Encoding is an algorithm for converting binary data to 6-bit ASCII. This is often needed to send binary files through internet mail gateways. UU Encoding is also commonly used in internet newsgroups for posting binary data.
UU Encoding breaks a group of 3 eight bit characters (24 bits) into 4 six bit characters (also 24 bits) and then adds 32 (a space) to each six bit character. This maps it into a transmittable character set. These characters are:
!"#$%&'()*+,-./
0123456789:;=?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
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Procedure Name
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Type
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Description
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(Declarations)
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Declarations
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Declarations and private variables for the CUUEncode class
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InputFileName
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Property
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Gets the name of the input file
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OutputFileName
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Property
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Sets the name of the output file
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dblToLong
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Private
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Performs an unsigned conversion from a Double value to a Long value.
This function correctly handles doubles greater than 2,147,483,647 and less than or equal to 4,294,967,295.
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Decode
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Method
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Decodes a file encoded with UUEncoding
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DecodeByte
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Private
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Decodes a single byte.
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Encode
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Method
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Encodes a file using UU Encoding
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EncodeByte
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Private
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Encodes a byte by manipulating the byte to ensure that it is a printable character code
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GetNamePart
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Private
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Returns the name and extension of a fully qualified file name
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GetPathPart
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Private
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Returns the path part of a string
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IntToByte
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Private
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Performs an unsigned conversion from an integer value to a byte value. This procedure correctly handles any integer value.
For example, performing the following assignment
lngNumber = -1
assigns -1 to the variable lngNumber. However, This assignment
lngNumber = IntToLong(-1)
assigns 65,535 to lngNumber.
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IntToLong
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Private
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Converts an integer value to a long value, treating the integer as unsigned
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LongToInt
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Private
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Performs an unsigned conversion from a Long value to an integer value
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MakeInt
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Private
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Combines two bytes into an integer.
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MakeLong
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Private
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Combines two words (integers) into a long. This routine correctly handles negative input Values
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MakePrintable
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Private
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Takes three bytes and converts them into 4 printable characters
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ReadFile
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Private
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Reads the specified number of bytes from the file
Using this function significantly increases the speed of processing files. The alternative to using a file buffer is reading a byte at a time from the file
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Shlb
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Private
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Shifts a numeric value left the specified number of bits.
Left shifting can be defined as a multiplication operation. For the number of bits we want to shift a value to the left, we need to raise two to that power, then multiply the result by our original value.
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Shrb
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Private
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Shifts a byte value right the selected number of places.
Right shifting can be defined as a division operation. For the number of bits we want to shift a value to the right, we need to raise two to that power, then our original value by the result.
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UnMakePrintable
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Private
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Take 4 printable characters and convert them into 3 bytes
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Overview of Total Visual SourceBook
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