mirror of
https://github.com/wmjordan/PDFPatcher.git
synced 2026-10-23 00:38:37 +08:00
WMJ
449 lines
14 KiB
C#
449 lines
14 KiB
C#
using System;
|
||
using System.Collections.Generic;
|
||
using System.Linq;
|
||
using iTextSharp.text.pdf;
|
||
using PDFPatcher.Common;
|
||
using PDFPatcher.Processor;
|
||
|
||
namespace PDFPatcher.Model
|
||
{
|
||
[System.Diagnostics.DebuggerDisplay ("Name = {Name}({FriendlyName}); Value = {Value}; {HasChildren}")]
|
||
public sealed class DocumentObject : IHierarchicalObject<DocumentObject>
|
||
{
|
||
static readonly string[] __ReversalRefNames = new string[] { "Parent", "Prev", "First", "Last", "P" };
|
||
static readonly int[] __CompoundTypes = new int[] { PdfObject.DICTIONARY, PdfObject.ARRAY, PdfObject.STREAM };
|
||
static readonly DocumentObject[] __Leaf = new DocumentObject[0];
|
||
|
||
internal PdfPathDocument OwnerDocument { get; private set; }
|
||
internal DocumentObject Parent { get; private set; }
|
||
internal string Name { get; set; }
|
||
internal PdfObject Value { get; set; }
|
||
internal string Description { get; set; }
|
||
internal object ExtensiveObject { get; set; }
|
||
internal PdfObjectType Type { get; private set; }
|
||
internal bool IsKeyObject { get; set; }
|
||
internal object ImageKey { get; set; }
|
||
/// <summary>
|
||
/// 获取友好形式的名称。
|
||
/// </summary>
|
||
internal string FriendlyName { get; set; }
|
||
/// <summary>
|
||
/// 获取友好形式的值。
|
||
/// </summary>
|
||
internal string FriendlyValue { get; set; }
|
||
|
||
public string LiteralValue {
|
||
get {
|
||
return GetItemValueText (Value, ExtensiveObject as PdfObject);
|
||
}
|
||
}
|
||
public bool HasChildren {
|
||
get {
|
||
if (Type != PdfObjectType.Normal
|
||
&& (Type == PdfObjectType.Trailer || Type == PdfObjectType.Pages || Type == PdfObjectType.Page || Type == PdfObjectType.PageCommands || Type == PdfObjectType.Hidden || Type == PdfObjectType.PageCommand && Children.Count > 0)) {
|
||
return true;
|
||
}
|
||
var po = Value ?? ExtensiveObject as PdfObject;
|
||
if (po == null) {
|
||
return false;
|
||
}
|
||
if (PdfHelper.CompoundTypes.Contains (po.Type)) {
|
||
return true;
|
||
}
|
||
else if (po.Type == PdfObject.INDIRECT) {
|
||
if (Type == PdfObjectType.GoToPage) {
|
||
return false;
|
||
}
|
||
var r = ExtensiveObject as PdfObject;
|
||
if (r == null) {
|
||
return false;
|
||
}
|
||
if (r.Type == PdfObject.DICTIONARY && Parent.Type == PdfObjectType.Outline && Name == "Next") {
|
||
return false;
|
||
}
|
||
return (r.Type == PdfObject.DICTIONARY && __ReversalRefNames.Contains (Name) == false
|
||
|| r.Type == PdfObject.ARRAY
|
||
|| r.Type == PdfObject.STREAM
|
||
);
|
||
}
|
||
return false;
|
||
}
|
||
}
|
||
IList<DocumentObject> _Children;
|
||
public ICollection<DocumentObject> Children {
|
||
get {
|
||
if (_Children == null) {
|
||
PopulateChildren (false);
|
||
if (_Children == null) {
|
||
_Children = __Leaf;
|
||
}
|
||
}
|
||
return _Children;
|
||
}
|
||
}
|
||
|
||
internal DocumentObject (PdfPathDocument ownerDocument, DocumentObject parent, string name, PdfObject value) :
|
||
this (ownerDocument, parent, name, value, PdfObjectType.Normal) {
|
||
}
|
||
internal DocumentObject (PdfPathDocument ownerDocument, DocumentObject parent, string name, PdfObject value, PdfObjectType type) {
|
||
OwnerDocument = ownerDocument;
|
||
Parent = parent;
|
||
if (value != null && value.Type == PdfObject.INDIRECT) {
|
||
var r = PdfReader.GetPdfObjectRelease (value);
|
||
if (r != null) {
|
||
ExtensiveObject = r;
|
||
if (r.Type == PdfObject.DICTIONARY) {
|
||
int page = ownerDocument.GetPageNumber (value as PdfIndirectReference);
|
||
if (page > 0) {
|
||
Description = String.Concat ("指向第 ", page, " 页");
|
||
type = PdfObjectType.GoToPage;
|
||
}
|
||
}
|
||
else if (r.Type == PdfObject.STREAM && PdfName.IMAGE.Equals (((PdfDictionary)r).GetAsName (PdfName.SUBTYPE))) {
|
||
type = PdfObjectType.Image;
|
||
}
|
||
}
|
||
}
|
||
Name = name; Value = value; Type = type;
|
||
}
|
||
|
||
internal bool RemoveChildByName (string name) {
|
||
if (HasChildren == false) {
|
||
return false;
|
||
}
|
||
for (int i = _Children.Count - 1; i >= 0; i--) {
|
||
if (_Children[i].Name == name) {
|
||
if (_Children is Array) {
|
||
_Children = new List<DocumentObject> (_Children);
|
||
}
|
||
_Children.RemoveAt (i);
|
||
var po = Value;
|
||
if (po != null) {
|
||
while (po.Type == PdfObject.INDIRECT) {
|
||
po = PdfReader.GetPdfObject (po);
|
||
}
|
||
if (po.Type == PdfObject.ARRAY) {
|
||
((PdfArray)po).Remove (i);
|
||
}
|
||
else if (po.Type == PdfObject.DICTIONARY || po.Type == PdfObject.STREAM) {
|
||
((PdfDictionary)po).Remove (new PdfName (name));
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
internal DocumentObject FindReferenceAncestor () {
|
||
var d = this;
|
||
do {
|
||
if (d.Value != null && d.Value.Type == PdfObject.INDIRECT) {
|
||
return d;
|
||
}
|
||
} while ((d = d.Parent) != null);
|
||
return null;
|
||
}
|
||
|
||
internal bool UpdateDocumentObject (object value) {
|
||
var po = Value as PdfObject;
|
||
if (po == null) {
|
||
return false;
|
||
}
|
||
switch (po.Type) {
|
||
case PdfObject.STRING:
|
||
var s = value as string;
|
||
if (s == (po as PdfString).ToUnicodeString ()) {
|
||
break;
|
||
}
|
||
Value = s.ToPdfString ();
|
||
break;
|
||
case PdfObject.NUMBER:
|
||
double n;
|
||
if (((string)value).TryParse (out n)) {
|
||
Value = new PdfNumber (n);
|
||
break;
|
||
}
|
||
return false;
|
||
case PdfObject.NAME:
|
||
Value = new PdfName ((string)value); break;
|
||
case PdfObject.BOOLEAN:
|
||
Value = new PdfBoolean ((bool)value); break;
|
||
}
|
||
if (Parent != null) {
|
||
var pd = ((Parent.ExtensiveObject ?? Parent.Value) as PdfDictionary);
|
||
if (pd != null) {
|
||
pd.Put (new PdfName (Name), Value);
|
||
_Children = null;
|
||
return true;
|
||
}
|
||
var pa = ((Parent.ExtensiveObject ?? Parent.Value) as PdfArray);
|
||
if (pa != null) {
|
||
pa.ArrayList[Int32.Parse (Name) - 1] = Value;
|
||
_Children = null;
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
private static string GetItemValueText (PdfObject po, PdfObject eo) {
|
||
if (po == null && eo == null) {
|
||
goto Exit;
|
||
}
|
||
if (po == null) {
|
||
po = eo;
|
||
eo = null;
|
||
}
|
||
switch (po.Type) {
|
||
case PdfObject.DICTIONARY: return String.Concat ("<<", (po as PdfDictionary).Size, " 子项>>");
|
||
case PdfObject.INDIRECT:
|
||
if (eo == null || __CompoundTypes.Contains (eo.Type)) {
|
||
return (po as PdfIndirectReference).ToString ();
|
||
}
|
||
else {
|
||
return String.Concat ((po as PdfIndirectReference).ToString (), "→", GetItemValueText (null, eo));
|
||
}
|
||
case PdfObject.NAME: return PdfHelper.DecodeKeyName (po);
|
||
case PdfObject.NUMBER: return (po as PdfNumber).DoubleValue.ToText();
|
||
case PdfObject.STRING: return (po as PdfString).Decode (null);
|
||
case PdfObject.STREAM: goto case PdfObject.DICTIONARY;
|
||
case PdfObject.ARRAY: return PdfHelper.GetArrayString (po as PdfArray);
|
||
case PdfObject.BOOLEAN: return (po as PdfBoolean).ToString ();
|
||
case PdfObject.NULL: return "Null";
|
||
}
|
||
Exit:
|
||
return null;
|
||
}
|
||
|
||
internal string GetContextName () {
|
||
var d = this;
|
||
string contextName = null;
|
||
if (d.Type != PdfObjectType.Normal) {
|
||
if (d.Type == PdfObjectType.Page) {
|
||
return "Page";
|
||
}
|
||
else if (d.Type == PdfObjectType.Image) {
|
||
return "Image";
|
||
}
|
||
}
|
||
while ((d.IsKeyObject == false || String.IsNullOrEmpty (contextName = d.Name)) && (d = d.Parent) != null) {
|
||
}
|
||
return contextName;
|
||
}
|
||
|
||
internal IList<DocumentObject> PopulateChildren (bool refresh) {
|
||
if (refresh) {
|
||
_Children = null;
|
||
}
|
||
if (_Children == null) {
|
||
if (Type == PdfObjectType.Page && Value == null) {
|
||
Value = OwnerDocument.Document.GetPageN ((int)ExtensiveObject);
|
||
}
|
||
else if (Type != PdfObjectType.Normal) {
|
||
PopulateChildrenForSpecialObject ();
|
||
}
|
||
if (_Children == null) {
|
||
PopulateChildrenForNormalObject ();
|
||
}
|
||
}
|
||
return _Children;
|
||
}
|
||
|
||
private void PopulateChildrenForNormalObject () {
|
||
var po = (ExtensiveObject as PdfObject) ?? Value;
|
||
_Children = __Leaf;
|
||
if (po == null) {
|
||
return;
|
||
}
|
||
if (po.Type == PdfObject.DICTIONARY || po.Type == PdfObject.STREAM) {
|
||
var pd = po as PdfDictionary;
|
||
var r = new DocumentObject[pd.Size + (Type == PdfObjectType.Page ? 1 : 0)];
|
||
var n = 0;
|
||
foreach (var item in pd) {
|
||
var d = new DocumentObject (OwnerDocument, this, PdfHelper.DecodeKeyName (item.Key), item.Value);
|
||
r[n++] = d;
|
||
var i = Model.PdfStructInfo.GetInfo (GetContextName (), d.Name);
|
||
if (i.Name != null && i.IsKeyObject) {
|
||
d.IsKeyObject = true;
|
||
}
|
||
if (String.IsNullOrEmpty (i.ImageKey) == false) {
|
||
d.ImageKey = i.ImageKey;
|
||
}
|
||
}
|
||
if (Type != PdfObjectType.Normal) {
|
||
if (Type == PdfObjectType.Page) {
|
||
r[n++] = new DocumentObject (OwnerDocument, this, Constants.Content.Operators, null, PdfObjectType.PageCommands) { IsKeyObject = true };
|
||
}
|
||
else if (Type == PdfObjectType.Trailer) {
|
||
var d = Array.Find (r, (o) => { return o.Name == "Root"; });
|
||
if (d != null) {
|
||
d.Type = PdfObjectType.Root;
|
||
}
|
||
}
|
||
else if (Type == PdfObjectType.Root) {
|
||
var d = Array.Find (r, (o) => { return o.Name == "Outlines"; });
|
||
if (d != null) {
|
||
d.Type = PdfObjectType.Outline;
|
||
}
|
||
}
|
||
else if (Type == PdfObjectType.Outline) {
|
||
var o = new List<DocumentObject> (r);
|
||
var or = pd.Get (PdfName.FIRST);
|
||
pd = PdfReader.GetPdfObject (or) as PdfDictionary;
|
||
if (pd != null) {
|
||
o.Add (new DocumentObject (OwnerDocument, this, Constants.Bookmark, or, PdfObjectType.Outline) {
|
||
Description = pd.Contains (PdfName.TITLE) ? pd.GetAsString (PdfName.TITLE).ToUnicodeString () : null
|
||
});
|
||
while ((or = pd.Get (PdfName.NEXT)) != null && (pd = PdfReader.GetPdfObject (or) as PdfDictionary) != null) {
|
||
o.Add (new DocumentObject (OwnerDocument, this, Constants.Bookmark, or, PdfObjectType.Outline) {
|
||
Description = pd.Contains (PdfName.TITLE) ? pd.GetAsString (PdfName.TITLE).ToUnicodeString () : null
|
||
});
|
||
}
|
||
}
|
||
_Children = o;
|
||
return;
|
||
}
|
||
}
|
||
_Children = r;
|
||
}
|
||
else if (po.Type == PdfObject.ARRAY) {
|
||
var pd = po as PdfArray;
|
||
var r = new DocumentObject[pd.Size];
|
||
var n = 0;
|
||
foreach (var item in pd.ArrayList) {
|
||
var d = new DocumentObject (OwnerDocument, this, (++n).ToText(), item);
|
||
r[n - 1] = d;
|
||
var i = Model.PdfStructInfo.GetInfo (GetContextName (), d.Name);
|
||
if (i.Name != null && i.IsKeyObject) {
|
||
d.IsKeyObject = true;
|
||
}
|
||
if (String.IsNullOrEmpty (i.ImageKey) == false) {
|
||
d.ImageKey = i.ImageKey;
|
||
}
|
||
}
|
||
_Children = r;
|
||
}
|
||
}
|
||
|
||
private void PopulateChildrenForSpecialObject () {
|
||
var pdf = OwnerDocument.Document;
|
||
if (Type == PdfObjectType.Pages) {
|
||
if (pdf.NumberOfPages == 0) {
|
||
return;
|
||
}
|
||
var r = PageRangeCollection.Parse (ExtensiveObject as string, 1, pdf.NumberOfPages, true);
|
||
var pn = new DocumentObject[r.TotalPages];
|
||
var i = 0;
|
||
foreach (var item in r) {
|
||
foreach (var p in item) {
|
||
pn[i++] = new DocumentObject (OwnerDocument, this, "第" + p + "页", null, PdfObjectType.Page) { ExtensiveObject = p };
|
||
}
|
||
}
|
||
_Children = pn;
|
||
}
|
||
else if (Type == PdfObjectType.PageCommands) {
|
||
// 解释页面指令
|
||
var pn = (int)Parent.ExtensiveObject;
|
||
var cp = new PdfPageCommandProcessor ();
|
||
cp.ProcessContent (pdf.GetPageContent (pn), pdf.GetPageN (pn).GetAsDict (PdfName.RESOURCES));
|
||
foreach (var item in cp.Commands) {
|
||
PopulatePageCommand (item);
|
||
}
|
||
}
|
||
else if (Type == PdfObjectType.PageCommand) {
|
||
_Children = __Leaf;
|
||
}
|
||
else if (Type == PdfObjectType.Hidden) {
|
||
var ul = PdfHelper.ListUnusedObjects (pdf, AppContext.LoadPartialPdfFile);
|
||
ExtensiveObject = ul;
|
||
var uo = new List<DocumentObject> ();
|
||
foreach (var item in ul) {
|
||
var u = pdf.GetPdfObjectRelease (item);
|
||
if (u != null) {
|
||
uo.Add (new DocumentObject (OwnerDocument, this, item.ToText(), u));
|
||
}
|
||
}
|
||
_Children = uo;
|
||
}
|
||
}
|
||
|
||
private void PopulatePageCommand (PdfPageCommand item) {
|
||
string fn;
|
||
var op = item.Name.ToString();
|
||
if (PdfPageCommand.GetFriendlyCommandName (op, out fn) == false){
|
||
fn = "未知操作符";
|
||
}
|
||
var o = new DocumentObject (OwnerDocument, this, fn, null, PdfObjectType.PageCommand)
|
||
{
|
||
FriendlyName = String.Concat (fn, "(", op, ")"),
|
||
ExtensiveObject = op
|
||
};
|
||
if (item.Type == PdfPageCommandType.Text) {
|
||
var t = item as TextCommand;
|
||
o.FriendlyValue = t.TextInfo.PdfString.GetOriginalBytes ().ToHexBinString ();
|
||
o.Description = t.TextInfo.Text;
|
||
if (item.Name.ToString () == "TJ") {
|
||
var a = item.Operands[0] as PdfArray;
|
||
if (a.Size > 0) {
|
||
var pt = item as PaceAndTextCommand;
|
||
var i = 0;
|
||
CreateChildrenList (ref o._Children);
|
||
foreach (var ti in a.ArrayList) {
|
||
var d = new DocumentObject (OwnerDocument, o, (++i).ToText (), ti);
|
||
if (ti.Type == PdfObject.STRING) {
|
||
d.FriendlyValue = (ti as PdfString).GetOriginalBytes ().ToHexBinString ();
|
||
d.Description = pt.DecodedTexts[i - 1];
|
||
}
|
||
o._Children.Add (d);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
else if (item.Type == PdfPageCommandType.Font) {
|
||
var f = item as FontCommand;
|
||
o.FriendlyValue = String.Concat (
|
||
f.FontName,
|
||
" (", Constants.Content.OperandNames.ResourceName, "：", f.ResourceName.ToString (), "); ",
|
||
Constants.Content.OperandNames.Size, "：", f.FontSize.DoubleValue.ToText ()
|
||
);
|
||
}
|
||
else if (item.Type == PdfPageCommandType.Enclosure) {
|
||
if (item.Operands.HasContent ()) {
|
||
var i = 0;
|
||
CreateChildrenList (ref o._Children);
|
||
foreach (var t in item.Operands) {
|
||
o._Children.Add (new DocumentObject (OwnerDocument, o, (++i).ToText(), t));
|
||
}
|
||
}
|
||
var e = item as EnclosingCommand;
|
||
if (e.HasCommand == false) {
|
||
return;
|
||
}
|
||
foreach (var cmd in e.Commands) {
|
||
o.PopulatePageCommand (cmd);
|
||
}
|
||
}
|
||
else if (item.Type == PdfPageCommandType.InlineImage) {
|
||
var s = item.Operands[0] as PdfImageData;
|
||
CreateChildrenList (ref o._Children);
|
||
foreach (var ii in s) {
|
||
o._Children.Add (new DocumentObject (OwnerDocument, o, PdfHelper.DecodeKeyName (ii.Key), ii.Value));
|
||
}
|
||
}
|
||
else {
|
||
o.FriendlyValue = item.GetOperandsText ();
|
||
}
|
||
CreateChildrenList (ref _Children);
|
||
_Children.Add (o);
|
||
}
|
||
|
||
static void CreateChildrenList (ref IList<DocumentObject> list) {
|
||
if (list == null || list == __Leaf) {
|
||
list = new List<DocumentObject> ();
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|