PDFPatcher/App/Processor/ContentProcessors/FixContentProcessor.cs

using System;
using System.Collections.Generic;
using iTextSharp.text.pdf;

namespace PDFPatcher.Processor
{
	sealed class FixContentProcessor : IPageProcessor
	{
		int _processedPageCount;

		#region IPageProcessor 成员
		public string Name { get { return "修复并删除冗余内容"; } }

		public void BeginProcess (DocProcessorContext context) {
			_processedPageCount = 0;
		}
		public bool EndProcess (PdfReader pdf) {
			Tracker.TraceMessage (Tracker.Category.Notice, this.Name + "功能：");
			Tracker.TraceMessage ("　　删除了 " + _processedPageCount + " 页的冗余内容。");
			return false;
		}

		public int EstimateWorkload (PdfReader pdf) {
			return pdf.NumberOfPages * 3;
		}

		public bool Process (PageProcessorContext context) {
			Tracker.IncrementProgress (3);
			if (ProcessCommands (context.PageCommands)) {
				context.IsPageContentModified = true;
				_processedPageCount++;
				return true;
			}
			return false;
		}

		#endregion

		static bool ProcessCommands (Model.IPdfPageCommandContainer container) {
			var r = false;
			var cl = container.Commands;
			var l = cl.Count;
			for (int i = 0; i < l; i++) {
				if (cl[i] is Model.EnclosingCommand ec) {
					r |= ProcessCommands (ec);
				}
			}
			return r;
		}
	}
}