15.3. The BufferedStream Class
A buffer is a block of bytes in memory used to cache data, thereby reducing the number of calls to the operating system. Buffers thus improve read and write performance. A buffer can be used for either reading or writing, but never both simultaneously. This is similar to Java's java.io.BufferedInputStream and java.io.BufferedOutputStream. In Java a typical practice is to wrap streams into their buffered versions so as to reduce the I/O calls. The same principle holds true for C#. System.IO.BufferedStream wraps over other streams (which do the actual I/O—say, a FileStream). Wrapping the FileStream with a BufferedStream speeds up file read and write operations.
Listing 15.3 shows how to read the file created in
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