mirror of
https://github.com/wmjordan/PDFPatcher.git
synced 2026-10-18 21:52:34 +08:00
WMJ
963 lines
36 KiB
C#
963 lines
36 KiB
C#
using System;
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using System.Collections.Generic;
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using iTextSharp.text.error_messages;
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using iTextSharp.text.pdf;
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using iTextSharp.text.pdf.parser;
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using PDFPatcher.Model;
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namespace PDFPatcher.Processor
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{
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internal class PdfContentStreamProcessor
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{
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// Fields
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readonly Stack<Model.GraphicsState> gsStack = new Stack<Model.GraphicsState>();
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readonly Stack<MarkedContentInfo> markedContentStack = new Stack<MarkedContentInfo>();
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readonly IDictionary<string, IContentOperator> operators = new Dictionary<string, IContentOperator>();
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readonly Dictionary<PdfName, IXObjectDoHandler> _XObjectDoHandlers = new Dictionary<PdfName, IXObjectDoHandler>();
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readonly Dictionary<int, FontInfoCache> _FontCache = new Dictionary<int, FontInfoCache>();
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readonly Dictionary<int, string> _FontNameCache = new Dictionary<int, string>();
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//IRenderListener renderListener;
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ResourceDictionary _Resources;
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Matrix _TextLineMatrix;
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Matrix _TextMatrix;
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public readonly static IContentOperator NopOperator = new IgnoreOperatorContentOperator();
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internal PdfContentStreamProcessor() {
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Reset();
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}
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// Methods
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internal Model.GraphicsState CurrentGraphicState => gsStack.Peek();
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internal Matrix TextMatrix => _TextMatrix;
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internal IContentOperator DefaultOperator { get; set; }
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protected IDictionary<int, string> Fonts => _FontNameCache;
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protected ResourceDictionary Resource => _Resources;
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protected void ApplyTextAdjust(float tj) {
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float adjustBy = -tj / 1000f * CurrentGraphicState.FontSize * CurrentGraphicState.HorizontalScaling;
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_TextMatrix = new Matrix(adjustBy, 0f).Multiply(_TextMatrix);
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}
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protected void AdjustTextMatrixX(float x) {
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_TextMatrix = new Matrix(x, 0f).Multiply(_TextMatrix);
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}
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protected void BeginMarkedContent(PdfName tag, PdfDictionary dict) {
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markedContentStack.Push(new MarkedContentInfo(tag, dict));
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}
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private void BeginText() {
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//this.renderListener.BeginTextBlock ();
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}
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private FontInfo GetFont(PRIndirectReference fontRef) {
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if (_FontCache.TryGetValue(fontRef.Number, out var r)) {
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r.Access++;
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return r.Info;
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}
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var f = new FontInfo(fontRef);
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_FontCache.Add(fontRef.Number, new FontInfoCache(f));
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_FontNameCache.Add(fontRef.Number, f.FontName);
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if (_FontCache.Count > 53) {
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var l = new List<KeyValuePair<int, FontInfoCache>>(_FontCache);
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l.Sort((x, y) => x.Value.Access - y.Value.Access);
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for (int i = 0; i < 10; i++) {
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int k = l[i].Key;
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_FontCache.Remove(k);
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_FontNameCache.Remove(k);
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}
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}
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return f;
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}
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protected virtual void DisplayPdfString(PdfString str) {
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//TextRenderInfo renderInfo = new TextRenderInfo (this.Decode (str), this.CurrentGraphicState, this.textMatrix, this.markedContentStack);
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//this.renderListener.RenderText (renderInfo);
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//this.textMatrix = new Matrix (renderInfo.GetUnscaledWidth (), 0f).Multiply (this.textMatrix);
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}
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protected virtual void DisplayXObject(PdfName xobjectName) {
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//IXObjectDoHandler handler;
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//PdfDictionary xobjects = this.resources.GetAsDict (PdfName.XOBJECT);
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//PdfObject xobject = xobjects.GetDirectObject (xobjectName);
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//PdfStream xobjectStream = (PdfStream)xobject;
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//PdfName subType = xobjectStream.GetAsName (PdfName.SUBTYPE);
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//if (!xobject.IsStream ()) {
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// throw new InvalidOperationException (MessageLocalization.GetComposedMessage ("XObject.1.is.not.a.stream", xobjectName));
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//}
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//this.xobjectDoHandlers.TryGetValue (subType, out handler);
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//if (handler == null) {
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// handler = this.xobjectDoHandlers[PdfName.DEFAULT];
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//}
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//handler.HandleXObject (this, xobjectStream, xobjects.GetAsIndirectObject (xobjectName));
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}
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private void EndMarkedContent() {
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markedContentStack.Pop();
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}
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private void EndText() {
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//this.renderListener.EndTextBlock ();
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}
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protected virtual void InvokeOperator(PdfLiteral oper, List<PdfObject> operands) {
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IContentOperator op;
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if (operators.TryGetValue(oper.ToString(), out op)) {
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op.Invoke(this, oper, operands);
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}
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else {
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DefaultOperator?.Invoke(this, oper, operands);
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}
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}
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protected void PopulateOperators() {
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RegisterContentOperator("q", new PushGraphicsState());
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RegisterContentOperator("Q", new PopGraphicsState());
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RegisterContentOperator("cm", new ModifyCurrentTransformationMatrix());
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RegisterContentOperator("gs", new ProcessGraphicsStateResource());
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var tcOperator = new SetTextCharacterSpacing();
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RegisterContentOperator("Tc", tcOperator);
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var twOperator = new SetTextWordSpacing();
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RegisterContentOperator("Tw", twOperator);
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RegisterContentOperator("Tz", new SetTextHorizontalScaling());
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var tlOperator = new SetTextLeading();
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RegisterContentOperator("TL", tlOperator);
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RegisterContentOperator("Tf", new SetTextFont());
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RegisterContentOperator("Tr", new SetTextRenderMode());
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RegisterContentOperator("Ts", new SetTextRise());
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RegisterContentOperator("BT", new BeginTextC());
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RegisterContentOperator("ET", new EndTextC());
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RegisterContentOperator("BMC", new BeginMarkedContentC());
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RegisterContentOperator("BDC", new BeginMarkedContentDictionary());
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RegisterContentOperator("EMC", new EndMarkedContentC());
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var tdOperator = new TextMoveStartNextLine();
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RegisterContentOperator("Td", tdOperator);
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RegisterContentOperator("TD", new TextMoveStartNextLineWithLeading(tdOperator, tlOperator));
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RegisterContentOperator("Tm", new TextSetTextMatrix());
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var tstarOperator = new TextMoveNextLine(tdOperator);
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RegisterContentOperator("T*", tstarOperator);
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var tjOperator = new ShowText();
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RegisterContentOperator("Tj", new ShowText());
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RegisterContentOperator("TJ", new ShowTextArray());
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var tickOperator = new MoveNextLineAndShowText(tstarOperator, tjOperator);
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RegisterContentOperator("'", tickOperator);
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RegisterContentOperator("\"", new MoveNextLineAndShowTextWithSpacing(twOperator, tcOperator, tickOperator));
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RegisterContentOperator("Do", new Do());
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}
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protected void PopulateXObjectDoHandlers() {
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RegisterXObjectDoHandler(PdfName.DEFAULT, new IgnoreXObjectDoHandler());
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RegisterXObjectDoHandler(PdfName.FORM, new FormXObjectDoHandler());
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RegisterXObjectDoHandler(PdfName.IMAGE, new ImageXObjectDoHandler());
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}
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public void ProcessContent(byte[] contentBytes, PdfDictionary resources) {
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_Resources.Push(resources);
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var tokenizer = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
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var ps = new PdfContentParser(tokenizer);
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var operands = new List<PdfObject>();
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while (ps.Parse(operands).Count > 0) {
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var oper = (PdfLiteral)operands[operands.Count - 1];
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if ("BI".Equals(oper.ToString())) {
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var img = InlineImageUtils.ParseInlineImage(ps, resources.GetAsDict(PdfName.COLORSPACE));
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InvokeOperator(oper, new List<PdfObject> { img, oper });
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// this.renderListener.RenderImage (renderInfo);
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}
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else {
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InvokeOperator(oper, operands);
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}
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}
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tokenizer.Close();
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_Resources.Pop();
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}
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internal IContentOperator RegisterContentOperator(string operatorString, IContentOperator oper) {
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if (oper == null) {
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operators.Remove(operatorString);
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return null;
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}
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return operators[operatorString] = oper;
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}
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internal IXObjectDoHandler RegisterXObjectDoHandler(PdfName xobjectSubType, IXObjectDoHandler handler) {
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IXObjectDoHandler old;
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_XObjectDoHandlers.TryGetValue(xobjectSubType, out old);
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_XObjectDoHandlers[xobjectSubType] = handler;
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return old;
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}
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internal virtual void Reset() {
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gsStack.Clear();
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gsStack.Push(new Model.GraphicsState());
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_TextMatrix = null;
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_TextLineMatrix = null;
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_Resources = new ResourceDictionary();
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}
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#region Nested Types
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internal interface IContentOperator
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{
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void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands);
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}
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internal interface IXObjectDoHandler
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{
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void HandleXObject(PdfContentStreamProcessor processor, PdfStream stream, PdfIndirectReference refi);
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}
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protected sealed class BeginMarkedContentC : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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processor.BeginMarkedContent((PdfName)operands[0], new PdfDictionary());
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}
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}
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protected sealed class BeginMarkedContentDictionary : IContentOperator
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{
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// Methods
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private PdfDictionary GetPropertiesDictionary(PdfObject operand1, PdfContentStreamProcessor.ResourceDictionary resources) {
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if (operand1.IsDictionary()) {
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return (PdfDictionary)operand1;
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}
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var dictionaryName = (PdfName)operand1;
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return resources.GetAsDict(dictionaryName);
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}
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var properties = operands[1];
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processor.BeginMarkedContent((PdfName)operands[0], GetPropertiesDictionary(properties, processor._Resources));
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}
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}
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protected sealed class BeginTextC : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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processor._TextMatrix = new Matrix();
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processor._TextLineMatrix = processor._TextMatrix;
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processor.BeginText();
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}
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}
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protected sealed class Do : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var xobjectName = (PdfName)operands[0];
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processor.DisplayXObject(xobjectName);
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}
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}
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protected sealed class EndMarkedContentC : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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processor.EndMarkedContent();
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}
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}
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protected sealed class EndTextC : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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processor._TextMatrix = null;
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processor._TextLineMatrix = null;
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processor.EndText();
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}
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}
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protected sealed class FormXObjectDoHandler : IXObjectDoHandler
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{
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// Methods
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public void HandleXObject(PdfContentStreamProcessor processor, PdfStream stream, PdfIndirectReference refi) {
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var resources = stream.GetAsDict(PdfName.RESOURCES);
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var contentBytes = ContentByteUtils.GetContentBytesFromContentObject(stream);
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var matrix = stream.GetAsArray(PdfName.MATRIX);
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new PdfContentStreamProcessor.PushGraphicsState().Invoke(processor, null, null);
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if (matrix != null) {
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float a = matrix.GetAsNumber(0).FloatValue;
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float b = matrix.GetAsNumber(1).FloatValue;
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float c = matrix.GetAsNumber(2).FloatValue;
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float d = matrix.GetAsNumber(3).FloatValue;
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float e = matrix.GetAsNumber(4).FloatValue;
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float f = matrix.GetAsNumber(5).FloatValue;
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processor.CurrentGraphicState.TransMatrix = new Matrix(a, b, c, d, e, f).Multiply(processor.CurrentGraphicState.TransMatrix);
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}
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processor.ProcessContent(contentBytes, resources);
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new PdfContentStreamProcessor.PopGraphicsState().Invoke(processor, null, null);
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}
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}
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protected sealed class IgnoreOperatorContentOperator : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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}
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}
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protected sealed class IgnoreXObjectDoHandler : IXObjectDoHandler
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{
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// Methods
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public void HandleXObject(PdfContentStreamProcessor processor, PdfStream xobjectStream, PdfIndirectReference refi) {
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}
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}
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protected sealed class ImageXObjectDoHandler : IXObjectDoHandler
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{
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// Methods
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public void HandleXObject(PdfContentStreamProcessor processor, PdfStream xobjectStream, PdfIndirectReference refi) {
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//ImageRenderInfo renderInfo = ImageRenderInfo.CreateForXObject (processor.CurrentGraphicState.TransMatrix, refi);
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//processor.renderListener.RenderImage (renderInfo);
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}
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}
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protected sealed class ModifyCurrentTransformationMatrix : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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float a = ((PdfNumber)operands[0]).FloatValue;
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float b = ((PdfNumber)operands[1]).FloatValue;
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float c = ((PdfNumber)operands[2]).FloatValue;
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float d = ((PdfNumber)operands[3]).FloatValue;
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float e = ((PdfNumber)operands[4]).FloatValue;
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float f = ((PdfNumber)operands[5]).FloatValue;
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var matrix = new Matrix(a, b, c, d, e, f);
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var gs = processor.gsStack.Peek();
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gs.TransMatrix = matrix.Multiply(gs.TransMatrix);
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}
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}
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protected sealed class MoveNextLineAndShowText : IContentOperator
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{
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// Fields
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private readonly IContentOperator showText;
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private readonly IContentOperator textMoveNextLine;
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// Methods
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public MoveNextLineAndShowText(IContentOperator textMoveNextLine, IContentOperator showText) {
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this.textMoveNextLine = textMoveNextLine;
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this.showText = showText;
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}
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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textMoveNextLine.Invoke(processor, null, new List<PdfObject>(0));
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showText.Invoke(processor, null, operands);
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}
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}
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protected sealed class MoveNextLineAndShowTextWithSpacing : IContentOperator
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{
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// Fields
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private readonly IContentOperator moveNextLineAndShowText;
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private readonly IContentOperator setTextCharacterSpacing;
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private readonly IContentOperator setTextWordSpacing;
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// Methods
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public MoveNextLineAndShowTextWithSpacing(IContentOperator setTextWordSpacing, IContentOperator setTextCharacterSpacing, IContentOperator moveNextLineAndShowText) {
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this.setTextWordSpacing = setTextWordSpacing;
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this.setTextCharacterSpacing = setTextCharacterSpacing;
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this.moveNextLineAndShowText = moveNextLineAndShowText;
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}
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var aw = (PdfNumber)operands[0];
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var ac = (PdfNumber)operands[1];
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var str = (PdfString)operands[2];
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var twOperands = new List<PdfObject>(1);
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twOperands.Insert(0, aw);
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setTextWordSpacing.Invoke(processor, null, twOperands);
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var tcOperands = new List<PdfObject>(1);
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tcOperands.Insert(0, ac);
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setTextCharacterSpacing.Invoke(processor, null, tcOperands);
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var tickOperands = new List<PdfObject>(1);
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tickOperands.Insert(0, str);
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moveNextLineAndShowText.Invoke(processor, null, tickOperands);
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}
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}
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protected sealed class PopGraphicsState : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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try {
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processor.gsStack.Pop();
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}
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catch (InvalidOperationException) {
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Tracker.DebugMessage("绘图状态堆栈为空。");
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}
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}
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}
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protected sealed class ProcessGraphicsStateResource : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var dictionaryName = (PdfName)operands[0];
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var extGState = processor._Resources.GetAsDict(PdfName.EXTGSTATE);
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if (extGState == null) {
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throw new ArgumentException(MessageLocalization.GetComposedMessage("resources.do.not.contain.extgstate.entry.unable.to.process.oper.1", oper));
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}
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var gsDic = extGState.GetAsDict(dictionaryName);
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if (gsDic == null) {
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throw new ArgumentException(MessageLocalization.GetComposedMessage("1.is.an.unknown.graphics.state.dictionary", dictionaryName));
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}
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var fontParameter = gsDic.GetAsArray(PdfName.FONT);
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if (fontParameter != null) {
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var font = processor.GetFont((PRIndirectReference)fontParameter[0]);
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float size = fontParameter.GetAsNumber(1).FloatValue;
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processor.CurrentGraphicState.Font = font;
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processor.CurrentGraphicState.FontSize = size;
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}
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}
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}
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protected sealed class PushGraphicsState : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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processor.gsStack.Push(processor.gsStack.Peek().Copy());
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}
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}
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protected sealed class ResourceDictionary : PdfDictionary
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{
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// Fields
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private readonly IList<PdfDictionary> resourcesStack = new List<PdfDictionary>();
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// Methods
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public override PdfObject GetDirectObject(PdfName key) {
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for (int i = resourcesStack.Count - 1; i >= 0; i--) {
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var subResource = resourcesStack[i];
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if (subResource != null) {
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var obj = subResource.GetDirectObject(key);
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if (obj != null) {
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return obj;
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}
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}
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}
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return base.GetDirectObject(key);
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}
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public void Pop() {
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resourcesStack.RemoveAt(resourcesStack.Count - 1);
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}
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public void Push(PdfDictionary resources) {
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resourcesStack.Add(resources);
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}
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}
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protected sealed class SetTextCharacterSpacing : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var charSpace = (PdfNumber)operands[0];
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processor.CurrentGraphicState.CharacterSpacing = charSpace.FloatValue;
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}
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}
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protected sealed class SetTextFont : IContentOperator
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{
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// Methods
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public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
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var fontResourceName = (PdfName)operands[0];
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float size = ((PdfNumber)operands[1]).FloatValue;
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var f = processor._Resources.GetAsDict(PdfName.FONT).Get(fontResourceName);
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var g = processor.CurrentGraphicState;
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if (f is PRIndirectReference fref) {
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var font = processor.GetFont(fref);
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g.FontID = fref.Number;
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g.Font = font;
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}
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else {
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Tracker.DebugMessage("字体（" + fontResourceName + "）不为引用。");
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var fd = f as PdfDictionary;
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g.FontID = 0;
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g.Font = new FontInfo(fd, 0);
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}
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g.FontSize = size;
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}
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}
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protected sealed class SetTextHorizontalScaling : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var scale = (PdfNumber)operands[0];
|
|
processor.CurrentGraphicState.HorizontalScaling = scale.FloatValue / 100f;
|
|
}
|
|
}
|
|
|
|
protected sealed class SetTextLeading : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var leading = (PdfNumber)operands[0];
|
|
processor.CurrentGraphicState.Leading = leading.FloatValue;
|
|
}
|
|
}
|
|
|
|
protected sealed class SetTextRenderMode : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var render = (PdfNumber)operands[0];
|
|
processor.CurrentGraphicState.RenderMode = render.IntValue;
|
|
}
|
|
}
|
|
|
|
protected sealed class SetTextRise : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var rise = (PdfNumber)operands[0];
|
|
processor.CurrentGraphicState.Rise = rise.FloatValue;
|
|
}
|
|
}
|
|
|
|
protected sealed class SetTextWordSpacing : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var wordSpace = (PdfNumber)operands[0];
|
|
processor.CurrentGraphicState.WordSpacing = wordSpace.FloatValue;
|
|
}
|
|
}
|
|
|
|
protected sealed class ShowText : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var str = (PdfString)operands[0];
|
|
processor.DisplayPdfString(str);
|
|
}
|
|
}
|
|
|
|
protected sealed class AccumulatedShowTextArray : IContentOperator
|
|
{
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var array = (PdfArray)operands[0];
|
|
float adj = 0;
|
|
using (var ms = new System.IO.MemoryStream(array.Length)) {
|
|
foreach (PdfObject item in array.ArrayList) {
|
|
if (item.Type == PdfObject.STRING) {
|
|
ms.Write((item as PdfString).GetBytes(), 0, item.Length);
|
|
}
|
|
else {
|
|
adj += ((PdfNumber)item).FloatValue;
|
|
}
|
|
}
|
|
processor.DisplayPdfString(new PdfString(ms.ToArray()));
|
|
}
|
|
processor.ApplyTextAdjust(adj);
|
|
}
|
|
}
|
|
|
|
protected sealed class ShowTextArray : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var array = (PdfArray)operands[0];
|
|
//using (var ms = new System.IO.MemoryStream (array.Length)) {
|
|
// foreach (PdfObject item in array.ArrayList) {
|
|
// if (item.Type == PdfObject.STRING) {
|
|
// ms.Write ((item as PdfString).GetBytes (), 0, item.Length);
|
|
// }
|
|
// else {
|
|
// processor.ApplyTextAdjust (((PdfNumber)item).FloatValue);
|
|
// }
|
|
// }
|
|
// processor.DisplayPdfString (new PdfString (ms.ToArray ()));
|
|
//}
|
|
|
|
float tj = 0f;
|
|
foreach (PdfObject entryObj in array.ArrayList) {
|
|
if (entryObj is PdfString) {
|
|
processor.DisplayPdfString((PdfString)entryObj);
|
|
tj = 0f;
|
|
}
|
|
else {
|
|
tj = ((PdfNumber)entryObj).FloatValue;
|
|
processor.ApplyTextAdjust(tj);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected sealed class TextMoveNextLine : IContentOperator
|
|
{
|
|
// Fields
|
|
private readonly TextMoveStartNextLine moveStartNextLine;
|
|
|
|
// Methods
|
|
public TextMoveNextLine(TextMoveStartNextLine moveStartNextLine) {
|
|
this.moveStartNextLine = moveStartNextLine;
|
|
}
|
|
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
var tdoperands = new List<PdfObject>(2);
|
|
tdoperands.Insert(0, new PdfNumber(0));
|
|
tdoperands.Insert(1, new PdfNumber(-processor.CurrentGraphicState.Leading));
|
|
moveStartNextLine.Invoke(processor, null, tdoperands);
|
|
}
|
|
}
|
|
|
|
protected sealed class TextMoveStartNextLine : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
float tx = ((PdfNumber)operands[0]).FloatValue;
|
|
float ty = ((PdfNumber)operands[1]).FloatValue;
|
|
processor._TextMatrix = new Matrix(tx, ty).Multiply(processor._TextLineMatrix);
|
|
processor._TextLineMatrix = processor._TextMatrix;
|
|
}
|
|
}
|
|
|
|
protected sealed class TextMoveStartNextLineWithLeading : IContentOperator
|
|
{
|
|
// Fields
|
|
private readonly TextMoveStartNextLine moveStartNextLine;
|
|
private readonly SetTextLeading setTextLeading;
|
|
|
|
// Methods
|
|
public TextMoveStartNextLineWithLeading(TextMoveStartNextLine moveStartNextLine, SetTextLeading setTextLeading) {
|
|
this.moveStartNextLine = moveStartNextLine;
|
|
this.setTextLeading = setTextLeading;
|
|
}
|
|
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
float ty = ((PdfNumber)operands[1]).FloatValue;
|
|
var tlOperands = new List<PdfObject>(1);
|
|
tlOperands.Insert(0, new PdfNumber(-ty));
|
|
setTextLeading.Invoke(processor, null, tlOperands);
|
|
moveStartNextLine.Invoke(processor, null, operands);
|
|
}
|
|
}
|
|
|
|
protected sealed class TextSetTextMatrix : IContentOperator
|
|
{
|
|
// Methods
|
|
public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
|
|
float a = ((PdfNumber)operands[0]).FloatValue;
|
|
float b = ((PdfNumber)operands[1]).FloatValue;
|
|
float c = ((PdfNumber)operands[2]).FloatValue;
|
|
float d = ((PdfNumber)operands[3]).FloatValue;
|
|
float e = ((PdfNumber)operands[4]).FloatValue;
|
|
float f = ((PdfNumber)operands[5]).FloatValue;
|
|
processor._TextLineMatrix = new Matrix(a, b, c, d, e, f);
|
|
processor._TextMatrix = processor._TextLineMatrix;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
internal static class InlineImageUtils
|
|
{
|
|
/**
|
|
* Simple class in case users need to differentiate an exception from processing
|
|
* inline images vs other exceptions
|
|
* @since 5.0.4
|
|
*/
|
|
public sealed class InlineImageParseException : System.IO.IOException
|
|
{
|
|
public InlineImageParseException(String message)
|
|
: base(message) {
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Map between key abbreviations allowed in dictionary of inline images and their
|
|
* equivalent image dictionary keys
|
|
*/
|
|
private static readonly IDictionary<PdfName, PdfName> inlineImageEntryAbbreviationMap;
|
|
/**
|
|
* Map between value abbreviations allowed in dictionary of inline images for COLORSPACE
|
|
*/
|
|
private static readonly IDictionary<PdfName, PdfName> inlineImageColorSpaceAbbreviationMap;
|
|
/**
|
|
* Map between value abbreviations allowed in dictionary of inline images for FILTER
|
|
*/
|
|
private static readonly IDictionary<PdfName, PdfName> inlineImageFilterAbbreviationMap;
|
|
static InlineImageUtils() { // static initializer
|
|
inlineImageEntryAbbreviationMap = new Dictionary<PdfName, PdfName> {
|
|
|
|
// allowed entries - just pass these through
|
|
[PdfName.BITSPERCOMPONENT] = PdfName.BITSPERCOMPONENT,
|
|
[PdfName.COLORSPACE] = PdfName.COLORSPACE,
|
|
[PdfName.DECODE] = PdfName.DECODE,
|
|
[PdfName.DECODEPARMS] = PdfName.DECODEPARMS,
|
|
[PdfName.FILTER] = PdfName.FILTER,
|
|
[PdfName.HEIGHT] = PdfName.HEIGHT,
|
|
[PdfName.IMAGEMASK] = PdfName.IMAGEMASK,
|
|
[PdfName.INTENT] = PdfName.INTENT,
|
|
[PdfName.INTERPOLATE] = PdfName.INTERPOLATE,
|
|
[PdfName.WIDTH] = PdfName.WIDTH,
|
|
|
|
// abbreviations - transform these to corresponding correct values
|
|
[new PdfName("BPC")] = PdfName.BITSPERCOMPONENT,
|
|
[new PdfName("CS")] = PdfName.COLORSPACE,
|
|
[new PdfName("D")] = PdfName.DECODE,
|
|
[new PdfName("DP")] = PdfName.DECODEPARMS,
|
|
[new PdfName("F")] = PdfName.FILTER,
|
|
[new PdfName("H")] = PdfName.HEIGHT,
|
|
[new PdfName("IM")] = PdfName.IMAGEMASK,
|
|
[new PdfName("I")] = PdfName.INTERPOLATE,
|
|
[new PdfName("W")] = PdfName.WIDTH
|
|
};
|
|
|
|
inlineImageColorSpaceAbbreviationMap = new Dictionary<PdfName, PdfName> {
|
|
[new PdfName("G")] = PdfName.DEVICEGRAY,
|
|
[new PdfName("RGB")] = PdfName.DEVICERGB,
|
|
[new PdfName("CMYK")] = PdfName.DEVICECMYK,
|
|
[new PdfName("I")] = PdfName.INDEXED
|
|
};
|
|
|
|
inlineImageFilterAbbreviationMap = new Dictionary<PdfName, PdfName> {
|
|
[new PdfName("AHx")] = PdfName.ASCIIHEXDECODE,
|
|
[new PdfName("A85")] = PdfName.ASCII85DECODE,
|
|
[new PdfName("LZW")] = PdfName.LZWDECODE,
|
|
[new PdfName("Fl")] = PdfName.FLATEDECODE,
|
|
[new PdfName("RL")] = PdfName.RUNLENGTHDECODE,
|
|
[new PdfName("CCF")] = PdfName.CCITTFAXDECODE,
|
|
[new PdfName("DCT")] = PdfName.DCTDECODE
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Parses an inline image from the provided content parser. The parser must be positioned immediately following the BI operator in the content stream.
|
|
* The parser will be left with current position immediately following the EI operator that terminates the inline image
|
|
* @param ps the content parser to use for reading the image.
|
|
* @return the parsed image
|
|
* @throws IOException if anything goes wring with the parsing
|
|
* @throws InlineImageParseException if parsing of the inline image failed due to issues specific to inline image processing
|
|
*/
|
|
public static PdfImageData ParseInlineImage(PdfContentParser ps, PdfDictionary colorSpaceDic) {
|
|
var d = ParseInlineImageDictionary(ps);
|
|
return new PdfImageData(d, ParseInlineImageSamples(d, colorSpaceDic, ps));
|
|
}
|
|
|
|
/**
|
|
* Parses the next inline image dictionary from the parser. The parser must be positioned immediately following the EI operator.
|
|
* The parser will be left with position immediately following the whitespace character that follows the ID operator that ends the inline image dictionary.
|
|
* @param ps the parser to extract the embedded image information from
|
|
* @return the dictionary for the inline image, with any abbreviations converted to regular image dictionary keys and values
|
|
* @throws IOException if the parse fails
|
|
*/
|
|
private static PdfDictionary ParseInlineImageDictionary(PdfContentParser ps) {
|
|
// by the time we get to here, we have already parsed the BI operator
|
|
var dictionary = new PdfDictionary();
|
|
|
|
for (PdfObject key = ps.ReadPRObject(); key != null && !"ID".Equals(key.ToString()); key = ps.ReadPRObject()) {
|
|
var value = ps.ReadPRObject();
|
|
|
|
PdfName resolvedKey;
|
|
inlineImageEntryAbbreviationMap.TryGetValue((PdfName)key, out resolvedKey);
|
|
if (resolvedKey == null)
|
|
resolvedKey = (PdfName)key;
|
|
|
|
dictionary.Put(resolvedKey, GetAlternateValue(resolvedKey, value));
|
|
}
|
|
|
|
int ch = ps.GetTokeniser().Read();
|
|
if (!PRTokeniser.IsWhitespace(ch))
|
|
throw new System.IO.IOException("Unexpected character " + ch + " found after ID in inline image");
|
|
|
|
return dictionary;
|
|
}
|
|
|
|
/**
|
|
* Transforms value abbreviations into their corresponding real value
|
|
* @param key the key that the value is for
|
|
* @param value the value that might be an abbreviation
|
|
* @return if value is an allowed abbreviation for the key, the expanded value for that abbreviation. Otherwise, value is returned without modification
|
|
*/
|
|
private static PdfObject GetAlternateValue(PdfName key, PdfObject value) {
|
|
if (key == PdfName.FILTER) {
|
|
if (value is PdfName pdfName
|
|
&& inlineImageFilterAbbreviationMap.TryGetValue(pdfName, out PdfName altValue)
|
|
&& altValue != null) {
|
|
return altValue;
|
|
}
|
|
else if (value is PdfArray array) {
|
|
var altArray = new PdfArray();
|
|
int count = array.Size;
|
|
for (int i = 0; i < count; i++) {
|
|
altArray.Add(GetAlternateValue(key, array[i]));
|
|
}
|
|
return altArray;
|
|
}
|
|
}
|
|
else if (key == PdfName.COLORSPACE) {
|
|
if (value is PdfName pdfName
|
|
&& inlineImageColorSpaceAbbreviationMap.TryGetValue(pdfName, out PdfName altValue)
|
|
&& altValue != null) {
|
|
return altValue;
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* @param colorSpaceName the name of the color space. If null, a bi-tonal (black and white) color space is assumed.
|
|
* @return the components per pixel for the specified color space
|
|
*/
|
|
private static int GetComponentsPerPixel(PdfName colorSpaceName, PdfDictionary colorSpaceDic) {
|
|
if (colorSpaceName == null)
|
|
return 1;
|
|
if (colorSpaceName.Equals(PdfName.DEVICEGRAY))
|
|
return 1;
|
|
if (colorSpaceName.Equals(PdfName.DEVICERGB))
|
|
return 3;
|
|
if (colorSpaceName.Equals(PdfName.DEVICECMYK))
|
|
return 4;
|
|
|
|
if (colorSpaceDic != null) {
|
|
var colorSpace = colorSpaceDic.GetAsArray(colorSpaceName);
|
|
if (colorSpace != null && PdfName.INDEXED.Equals(colorSpace.GetAsName(0))) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
throw new ArgumentException("Unexpected color space " + colorSpaceName);
|
|
}
|
|
|
|
/**
|
|
* Computes the number of unfiltered bytes that each row of the image will contain.
|
|
* If the number of bytes results in a partial terminating byte, this number is rounded up
|
|
* per the PDF specification
|
|
* @param imageDictionary the dictionary of the inline image
|
|
* @return the number of bytes per row of the image
|
|
*/
|
|
private static int ComputeBytesPerRow(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic) {
|
|
var wObj = imageDictionary.GetAsNumber(PdfName.WIDTH);
|
|
var bpcObj = imageDictionary.GetAsNumber(PdfName.BITSPERCOMPONENT);
|
|
int cpp = GetComponentsPerPixel(imageDictionary.GetAsName(PdfName.COLORSPACE), colorSpaceDic);
|
|
int w = wObj.IntValue;
|
|
int bpc = bpcObj?.IntValue ?? 1;
|
|
return (w * bpc * cpp + 7) / 8;
|
|
}
|
|
|
|
/**
|
|
* Parses the samples of the image from the underlying content parser, ignoring all filters.
|
|
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
|
|
* The parser will be left positioned immediately following the EI operator.
|
|
* This is primarily useful if no filters have been applied.
|
|
* @param imageDictionary the dictionary of the inline image
|
|
* @param ps the content parser
|
|
* @return the samples of the image
|
|
* @throws IOException if anything bad happens during parsing
|
|
*/
|
|
private static byte[] ParseUnfilteredSamples(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic, PdfContentParser ps) {
|
|
// special case: when no filter is specified, we just read the number of bits
|
|
// per component, multiplied by the width and height.
|
|
if (imageDictionary.Contains(PdfName.FILTER))
|
|
throw new ArgumentException("Dictionary contains filters");
|
|
|
|
var h = imageDictionary.GetAsNumber(PdfName.HEIGHT);
|
|
|
|
int bytesToRead = ComputeBytesPerRow(imageDictionary, colorSpaceDic) * h.IntValue;
|
|
var bytes = new byte[bytesToRead];
|
|
var tokeniser = ps.GetTokeniser();
|
|
|
|
int shouldBeWhiteSpace = tokeniser.Read(); // skip next character (which better be a whitespace character - I suppose we could check for this)
|
|
// from the PDF spec: Unless the image uses ASCIIHexDecode or ASCII85Decode as one of its filters, the ID operator shall be followed by a single white-space character, and the next character shall be interpreted as the first byte of image data.
|
|
// unfortunately, we've seen some PDFs where there is no space following the ID, so we have to capture this case and handle it
|
|
int startIndex = 0;
|
|
if (!PRTokeniser.IsWhitespace(shouldBeWhiteSpace) || shouldBeWhiteSpace == 0) {
|
|
bytes[0] = (byte)shouldBeWhiteSpace;
|
|
startIndex++;
|
|
}
|
|
for (int i = startIndex; i < bytesToRead; i++) {
|
|
int ch = tokeniser.Read();
|
|
if (ch == -1)
|
|
throw new InlineImageParseException("End of content stream reached before end of image data");
|
|
|
|
bytes[i] = (byte)ch;
|
|
}
|
|
var ei = ps.ReadPRObject();
|
|
if (!ei.ToString().Equals("EI"))
|
|
throw new InlineImageParseException("EI not found after end of image data");
|
|
|
|
return bytes;
|
|
}
|
|
|
|
/**
|
|
* Parses the samples of the image from the underlying content parser, accounting for filters
|
|
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
|
|
* The parser will be left positioned immediately following the EI operator.
|
|
* <b>Note:</b>This implementation does not actually apply the filters at this time
|
|
* @param imageDictionary the dictionary of the inline image
|
|
* @param ps the content parser
|
|
* @return the samples of the image
|
|
* @throws IOException if anything bad happens during parsing
|
|
*/
|
|
private static byte[] ParseInlineImageSamples(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic, PdfContentParser ps) {
|
|
// by the time we get to here, we have already parsed the ID operator
|
|
|
|
if (!imageDictionary.Contains(PdfName.FILTER)) {
|
|
return ParseUnfilteredSamples(imageDictionary, colorSpaceDic, ps);
|
|
}
|
|
|
|
|
|
// read all content until we reach an EI operator surrounded by whitespace.
|
|
// The following algorithm has two potential issues: what if the image stream
|
|
// contains <ws>EI<ws> ?
|
|
// Plus, there are some streams that don't have the <ws> before the EI operator
|
|
// it sounds like we would have to actually decode the content stream, which
|
|
// I'd rather avoid right now.
|
|
var baos = new System.IO.MemoryStream();
|
|
var accumulated = new System.IO.MemoryStream();
|
|
int ch;
|
|
int found = 0;
|
|
var tokeniser = ps.GetTokeniser();
|
|
byte[] ff = null;
|
|
|
|
while ((ch = tokeniser.Read()) != -1) {
|
|
if (found == 0 && PRTokeniser.IsWhitespace(ch)) {
|
|
found++;
|
|
accumulated.WriteByte((byte)ch);
|
|
}
|
|
else if (found == 1 && ch == 'E') {
|
|
found++;
|
|
accumulated.WriteByte((byte)ch);
|
|
}
|
|
else if (found == 1 && PRTokeniser.IsWhitespace(ch)) {
|
|
// this clause is needed if we have a white space character that is part of the image data
|
|
// followed by a whitespace character that precedes the EI operator. In this case, we need
|
|
// to flush the first whitespace, then treat the current whitespace as the first potential
|
|
// character for the end of stream check. Note that we don't increment 'found' here.
|
|
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
|
|
accumulated.SetLength(0);
|
|
accumulated.WriteByte((byte)ch);
|
|
}
|
|
else if (found == 2 && ch == 'I') {
|
|
found++;
|
|
accumulated.WriteByte((byte)ch);
|
|
}
|
|
else if (found == 3 && PRTokeniser.IsWhitespace(ch)) {
|
|
return baos.ToArray();
|
|
}
|
|
else {
|
|
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
|
|
accumulated.SetLength(0);
|
|
|
|
baos.WriteByte((byte)ch);
|
|
found = 0;
|
|
}
|
|
}
|
|
throw new InlineImageParseException("Could not find image data or EI");
|
|
}
|
|
}
|
|
|
|
sealed class FontInfoCache
|
|
{
|
|
public readonly FontInfo Info;
|
|
public int Access;
|
|
|
|
public FontInfoCache(FontInfo info) {
|
|
Info = info;
|
|
}
|
|
}
|
|
}
|
|
}
|