Fix pdfcpu#94

Author: hhrutter

README.md

@@ -1,4 +1,4 @@
-# pdfcpu: a golang pdf processor
+# pdfcpu: a Go PDF processor
 
 [![Build Status](https://travis-ci.org/hhrutter/pdfcpu.svg?branch=master)](https://travis-ci.org/hhrutter/pdfcpu)
 [![GoDoc](https://godoc.org/github.com/hhrutter/pdfcpu?status.svg)](https://godoc.org/github.com/hhrutter/pdfcpu)
@@ -17,15 +17,15 @@ It provides both an API and a CLI. Supported are all versions up to PDF 1.7 (ISO
 This is an effort to build a comprehensive PDF processing library from the ground up written in Go. Over time pdfcpu aims to support the standard range of PDF processing features and also any interesting use cases that may present themselves along the way.
 
 <p align="center">
-  <kbd><img src="resources/gridpdf.png" height="150"></kbd>&nbsp;
-  <kbd><img src="resources/wmi1abs.png" height="150"></kbd>&nbsp;
-  <kbd><img src="resources/nup9pdf.png" height="150"></kbd>&nbsp;
-  <kbd><img src="resources/stt31.png" height="150"></kbd><br><br>
-  <kbd><img src="resources/sti.png" height="150"></kbd>&nbsp;
+  <kbd><a href="https://pdfcpu.io/core/grid"><img src="resources/gridpdf.png" height="150"></a></kbd>&nbsp;
+  <kbd><a href="https://pdfcpu.io/core/watermark"><img src="resources/wmi1abs.png" height="150"></a></kbd>&nbsp;
+  <kbd><a href="https://pdfcpu.io/core/nup"><img src="resources/nup9pdf.png" height="150"></a></kbd>&nbsp;
+  <kbd><a href="https://pdfcpu.io/core/stamp"><img src="resources/stt31.png" height="150"></a></kbd><br><br>
+  <kbd><a href="https://pdfcpu.io/core/stamp"><img src="resources/sti.png" height="150"></a></kbd>&nbsp;
   <kbd><img src="resources/hold3.png" height="150"></kbd>&nbsp;
-  <kbd><img src="resources/wmi4.png" height="150"></kbd>&nbsp;<br><br>
-  <kbd><img src="resources/stp.png" height="150"></kbd>&nbsp;
-  <kbd><img src="resources/gridimg.png" height="150"></kbd>
+  <kbd><a href="https://pdfcpu.io/core/watermark"><img src="resources/wmi4.png" height="150"></a></kbd>&nbsp;<br><br>
+  <kbd><a href="https://pdfcpu.io/core/stamp"><img src="resources/stp.png" height="150"></a></kbd>&nbsp;
+  <kbd><a href="https://pdfcpu.io/core/grid"><img src="resources/gridimg.png" height="150"></a></kbd>
 </p>
 
 ## Focus
@@ -64,7 +64,8 @@ The main focus lies on strong support for batch processing and scripting via a r
 ### GoDoc
 
 * [pdfcpu package](https://godoc.org/github.com/hhrutter/pdfcpu)
-* [pdfcpu api](https://godoc.org/github.com/hhrutter/pdfcpu/pkg/api)
+* [pdfcpu API](https://godoc.org/github.com/hhrutter/pdfcpu/pkg/api)
+* [pdfcpu CLI](https://godoc.org/github.com/hhrutter/pdfcpu/pkg/cli)
 
 ## Status
 

pkg/pdfcpu/writeObjects.go

@@ -204,9 +204,12 @@ func writeObject(ctx *Context, objNumber, genNumber int, s string) error {
 
 	w := ctx.Write
 
-	// Cleanup entry (nexessary for split command)
-	entry, _ := ctx.FindTableEntry(objNumber, genNumber)
-	entry.Compressed = false
+	// Cleanup entry (necessary for split command)
+	// TODO This is not the right place to check for an existing obj since we maybe writing NULL.
+	entry, ok := ctx.FindTableEntry(objNumber, genNumber)
+	if ok {
+		entry.Compressed = false
+	}
 
 	// Set write-offset for this object.
 	w.SetWriteOffset(objNumber)

pkg/pdfcpu/xreftable.go

@@ -266,17 +266,11 @@ func (xRefTable *XRefTable) FindTableEntryLight(objNr int) (*XRefTableEntry, boo
 func (xRefTable *XRefTable) FindTableEntry(objNr int, genNr int) (*XRefTableEntry, bool) {
 
 	//fmt.Printf("FindTableEntry: obj#:%d gen:%d \n", objNumber, generationNumber)
-
 	entry, found := xRefTable.Find(objNr)
-	// if found && entry == nil {
-	// 	fmt.Printf("FindTableEntry(%d,%d) finds entry = nil!\n", objNr, genNr)
-	// }
-
-	if found && *entry.Generation == genNr {
-		return entry, found
+	if !found || *entry.Generation != genNr {
+		return nil, false
 	}
-
-	return nil, false
+	return entry, found
 }
 
 // FindTableEntryForIndRef returns the XRefTable entry for given indirect reference.