Fix for outputing Function type 0 (colorspace)

pdf/model/colorspace_test.go

@@ -6,8 +6,13 @@
 package model
 
 import (
+	"bytes"
 	"fmt"
+	"io/ioutil"
 	"testing"
+
+	"github.com/unidoc/unidoc/pdf/core"
+	"github.com/unidoc/unidoc/pdf/internal/testutils"
 )
 
 func TestSeparationCS1(t *testing.T) {
@@ -44,3 +49,128 @@ func TestDeviceNCS1(t *testing.T) {
 
 	//t.Errorf("Test not implemented yet")
 }
+
+// Bug with outputing Separation colorspaces using a Function0 function.
+func TestColorspaceLoading(t *testing.T) {
+	rawpdf := []byte(`
+10 0 obj
+<<
+	/ColorSpace <<
+        /R99 99 0 R
+		/R86 86 0 R
+		/R88 88 0 R
+	>>
+>>
+endobj
+99 0 obj
+[/Separation /All 86 0 R 87 0 R]
+endobj
+86 0 obj
+[/ICCBased 85 0 R]
+endobj
+88 0 obj
+[/Separation /Black 86 0 R 87 0 R]
+endobj
+85 0 obj
+<<
+	/N 3
+	/Alternate /DeviceRGB
+	/Length 3144
+>>
+stream
+!!STREAMDATA2!!
+endstream endobj
+87 0 obj
+<<
+	/Size [255]
+	/BitsPerSample 8
+	/Domain [0 1]
+	/Length 765
+	/Encode [0 254]
+	/Decode [0 1 0 1 0 1]
+	/Range [0 1 0 1 0 1]
+	/FunctionType 0
+>>
+stream
+!!STREAMDATA1!!
+endstream endobj
+`)
+	functype0, err := ioutil.ReadFile(`testdata/cs_functype0.bin`)
+	if err != nil {
+		t.Fatalf("Error: %v", err)
+	}
+
+	iccdata, err := ioutil.ReadFile(`testdata/iccstream.bin`)
+	if err != nil {
+		t.Fatalf("Error: %v", err)
+	}
+
+	rawpdf = bytes.Replace(rawpdf, []byte("!!STREAMDATA1!!"), functype0, 1)
+	rawpdf = bytes.Replace(rawpdf, []byte("!!STREAMDATA2!!"), iccdata, 1)
+	//fmt.Printf("%s\n", rawpdf)
+
+	objMap, err := testutils.ParseIndirectObjects(string(rawpdf))
+	if err != nil {
+		t.Fatalf("Error: %v", err)
+	}
+	if len(objMap) != 6 {
+		t.Fatalf("len(objMap) != 6 (%d)", len(objMap))
+	}
+
+	resourceDict, ok := core.GetDict(objMap[10])
+	if !ok {
+		t.Fatalf("Resource object missing dictionary")
+	}
+
+	resources, err := NewPdfPageResourcesFromDict(resourceDict)
+	if err != nil {
+		t.Fatalf("Error loading resources: %v", err)
+	}
+
+	fmt.Printf("Out\n")
+	fmt.Printf("%s\n", resources.ToPdfObject())
+	outDict, ok := core.GetDict(resources.ToPdfObject())
+	if !ok {
+		t.Fatalf("error")
+	}
+	fmt.Printf("%s\n", outDict.DefaultWriteString())
+	r99, ok := resources.GetColorspaceByName("R99")
+	if !ok {
+		t.Fatalf("error")
+	}
+
+	array, ok := core.GetArray(r99.ToPdfObject())
+	if !ok {
+		t.Fatalf("error")
+	}
+
+	if array.Len() != 4 {
+		t.Fatalf("len != 4 (got %d)", array.Len())
+	}
+
+	name, ok := core.GetName(array.Get(0))
+	if !ok || *name != "Separation" {
+		t.Fatalf("Unexpected value")
+	}
+
+	name, ok = core.GetName(array.Get(1))
+	if !ok || *name != "All" {
+		t.Fatalf("Unexpected value")
+	}
+
+	ind, ok := core.GetIndirect(array.Get(2))
+	if !ok {
+		t.Fatalf("error")
+	}
+	if ind.ObjectNumber != 86 {
+		t.Fatalf("Incorrect obj num")
+	}
+
+	f, ok := core.GetStream(array.Get(3))
+	if !ok {
+		t.Fatalf("Stream get error")
+	}
+	if f.ObjectNumber != 87 {
+		t.Fatalf("Incorrect function obj number (got %d)", f.ObjectNumber)
+	}
+}

pdf/model/functions.go

@@ -229,8 +229,7 @@ func newPdfFunctionType0FromStream(stream *PdfObjectStream) (*PdfFunctionType0,
 }
 
 func (this *PdfFunctionType0) ToPdfObject() PdfObject {
-	container := this.container
-	if container != nil {
+	if this.container == nil {
 		this.container = &PdfObjectStream{}
 	}
 
@@ -267,10 +266,10 @@ func (this *PdfFunctionType0) ToPdfObject() PdfObject {
 	// TODO: Encode.
 	// Either here, or automatically later on when writing out.
 	dict.Set("Length", MakeInteger(int64(len(this.rawData))))
-	container.Stream = this.rawData
+	this.container.Stream = this.rawData
 
-	container.PdfObjectDictionary = dict
-	return container
+	this.container.PdfObjectDictionary = dict
+	return this.container
 }
 
 func (this *PdfFunctionType0) Evaluate(x []float64) ([]float64, error) {

pdf/model/reader.go

@@ -530,7 +530,7 @@ func (this *PdfReader) buildPageList(node *PdfIndirectObject, parent *PdfIndirec
 	if !ok {
 		return errors.New("Node missing Type (Required)")
 	}
-	common.Log.Trace("buildPageList node type: %s", *objType)
+	common.Log.Trace("buildPageList node type: %s (%+v)", *objType, node)
 	if *objType == "Page" {
 		p, err := this.newPdfPageFromDict(nodeDict)
 		if err != nil {

pdf/model/testdata/cs_functype0.bin

@@ -0,0 +1 @@
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>羲梟斅嬅沆莢桁坂標頗充朮朮寨埰窒猝楫拙全碇傳日欌壹幽邑幼五迂僚偃醴連愼壓押率循恂塞洩舌輻査死薄腹蔔寐璞粕吏輞埋兩菱蘆撞冷東喇唐塘菊吉桔辜驅鷗芥藁蠱奸漑皆훗角<EFBFBD>팔훅훌컸팅팍쩨컨컬읔쩜쩝옥읍응슴옘씨뻬스슨뭡뻗뻠맏뭍뭐떳링렁뉠떨떫껨눙눴교껐께<EFBFBD>괼굅<EFBFBD><EFBFBD><EFBFBD>ギ<EFBFBD><EFBFBD>がЗカØぇぉ┤<EFBFBD><EFBFBD>ⅶ┐└％ⅱㄴ·짛＂젪줋　옞젥젧쐿옕옗썭씂쐺솠썥썧뿗솙솚뼐삎뿓뵕뼋뼍뱯뵏뵒몥뱪뱬룖몡몢럯릫룒뙊럨럪땷뙄뙆닂뒊뒌뇡늽늿뀍뇙뇛꼩뀇뀉굝꼤꼦걙<EFBFBD>굚굙~<7E>~<7E>}|~~{~}{}|z||y{{x{zxzywyyvyxuxwuwvtvvsvurutrtsqsspsrorqoqpnppmoolonknmkmljllikkhkjhjigihfhheggdgfdfeceebddadc`cb`ba_aa^``]`_]_^\^^[]]Z]\Z\[Y[ZXZZWYYVXXUWWTVVSUURTTQTSPSRORQNQPNPOMONLNMKMLJLKIKJHJIGIIFHHEGGDFFCEEBDDACC@CB@BA?A@>@?=?><>=;==:<<9;:8:9798687566455344233122/11.0/-/.,.-+,,*++)**())'((&''%&&$%%#$$"##!"" !!