System.Web.Compilation.AssemblyBuilder.CopyFileWithChecksum C# (CSharp) Method

		void CopyFileWithChecksum (Stream input, string to, string from, ICodePragmaGenerator pragmaGenerator)
		{
			if (pragmaGenerator == null) {
				// This is BAD, BAD, BAD! CodeDOM API is really no good in this
				// instance.
				string filedata;
				using (StreamReader sr = new StreamReader (input, WebEncoding.FileEncoding)) {
					filedata = sr.ReadToEnd ();
				}

				var snippet = new CodeSnippetCompileUnit (filedata);
				snippet.LinePragma = new CodeLinePragma (from, 1);
				filedata = null;
				AddCodeCompileUnit (snippet);
				snippet = null;
				
				return;
			}
			
			MD5 checksum = MD5.Create ();
			using (FileStream fs = new FileStream (to, FileMode.Create, FileAccess.Write)) {
				using (StreamWriter sw = new StreamWriter (fs, Encoding.UTF8)) {
					using (StreamReader sr = new StreamReader (input, WebEncoding.FileEncoding)) {
						int count = pragmaGenerator.ReserveSpace (from);
						char[] src;
						
						if (count > COPY_BUFFER_SIZE)
							src = new char [count];
						else
							src = new char [COPY_BUFFER_SIZE];

						sw.Write (src, 0, count);
						do {
							count = sr.Read (src, 0, COPY_BUFFER_SIZE);
							if (count == 0) {
								UpdateChecksum (src, 0, checksum, true);
								break;
							}
						
							sw.Write (src, 0, count);
							UpdateChecksum (src, count, checksum, false);
						} while (true);
						src = null;
					}
				}
			}
			pragmaGenerator.DecorateFile (to, from, checksum, Encoding.UTF8);
		}