More detailed logging

common/logging.go

@@ -41,6 +41,8 @@ func (this DummyLogger) Debug(format string, args ...interface{}) {
 // Simple Console Logger that the tests use.
 type ConsoleLogger struct{}
 
+const DebugOutput = false
+
 func (this ConsoleLogger) Error(format string, args ...interface{}) {
 	this.output(os.Stderr, "[ERROR] ", format, args...)
 }
@@ -58,7 +60,9 @@ func (this ConsoleLogger) Info(format string, args ...interface{}) {
 }
 
 func (this ConsoleLogger) Debug(format string, args ...interface{}) {
+	if DebugOutput {
 		this.output(os.Stdout, "[DEBUG] ", format, args...)
+	}
 }
 
 func (this ConsoleLogger) output(f *os.File, prefix, format string, args ...interface{}) {

pdf/page.go

@@ -15,6 +15,7 @@ package pdf
 import (
 	"errors"
 	"fmt"
+	"os"
 	"regexp"
 	"strconv"
 
@@ -220,6 +221,16 @@ type PdfPage struct {
 	pageDict             *PdfObjectDictionary
 }
 
+func (this *PdfPage) Show(pageNum int) {
+	this.GetPageDict()
+	common.Log.Info("-PdfPage.Show page %d ========================================", pageNum)
+	fmt.Printf("BoxColorInfo=%s\n", Trace(this.BoxColorInfo))
+	fmt.Printf("Contents=%s\n", Trace(this.Contents))
+	ShowDict(os.Stdout, "PdfPage.pageDict", this.pageDict)
+	this.Resources.Show()
+	common.Log.Info("+PdfPage.Show page %d ========================================", pageNum)
+}
+
 func NewPdfPage() *PdfPage {
 	page := PdfPage{}
 	page.pageDict = &PdfObjectDictionary{}
@@ -696,6 +707,20 @@ type PdfPageResources struct {
 	ProcSet    PdfObject
 }
 
+func (this *PdfPageResources) Show() {
+	common.Log.Info("-PdfPageResources.Show ========================================")
+	fmt.Printf("ExtGState=%s\n", Trace(this.ExtGState))
+	fmt.Printf("ColorSpace=%s\n", Trace(this.ColorSpace))
+	fmt.Printf("Pattern=%s\n", Trace(this.Pattern))
+	fmt.Printf("Shading=%s\n", Trace(this.Shading))
+	ShowDict(os.Stdout, "PdfPageResources.XObject", this.XObject)
+	ShowDict(os.Stdout, "PdfPageResources.Font", this.Font)
+	// fmt.Printf("Font=%s\n", Trace(this.Font))
+	fmt.Printf("ProcSet=%s\n", Trace(this.ProcSet))
+	common.Log.Info("+PdfPageResources.Show ========================================")
+
+}
+
 func NewPdfPageResourcesFromDict(dict *PdfObjectDictionary) (*PdfPageResources, error) {
 	r := PdfPageResources{}
 

pdf/pdfparser.go

@@ -1199,14 +1199,14 @@ func (this *PdfParser) parseIndirectObjectBase(isIndirect bool) (PdfObject, erro
 		hb := make([]byte, hlen)
 		_, err = this.ReadAtLeast(hb, hlen)
 		if err != nil {
-			common.Log.Debug("ERROR: unable to read - %s", err)
+			common.Log.Error("unable to read - %s", err)
 			return nil, err
 		}
 		common.Log.Debug("textline: %s", hb)
 
 		result := reIndirectObject.FindStringSubmatch(string(hb))
 		if len(result) < 3 {
-			common.Log.Debug("ERROR: Unable to find object signature (%s)", string(hb))
+			common.Log.Error("Unable to find object signature (%s)", string(hb))
 			return &indirect, errors.New("Unable to detect indirect object signature")
 		}
 
@@ -1280,18 +1280,18 @@ func (this *PdfParser) parseIndirectObjectBase(isIndirect bool) (PdfObject, erro
 						return nil, errors.New("Stream length needs to be an integer")
 					}
 					streamLength := *pstreamLength
-					if streamLength < 0 {
+					if streamLength < 0 { // !@#$ < 1 ?
 						return nil, errors.New("Stream needs to be longer than 0")
 					}
 
 					stream := make([]byte, streamLength)
 					_, err = this.ReadAtLeast(stream, int(streamLength))
 					if err != nil {
-						common.Log.Debug("ERROR stream (%d): %X", len(stream), stream)
+						common.Log.Error("stream (%d): %X", len(stream), stream)
 						return nil, err
 					}
 
-					streamobj := PdfObjectStream{}
+					streamobj := PdfObjectStream{} // !@#$
 					streamobj.Stream = stream
 					streamobj.PdfObjectDictionary = indirect.PdfObject.(*PdfObjectDictionary)
 					streamobj.ObjectNumber = indirect.ObjectNumber

pdf/reader.go

@@ -467,7 +467,7 @@ func (this *PdfReader) buildPageList(node *PdfIndirectObject, parent *PdfIndirec
 		return nil
 	}
 	if *objType != "Pages" {
-		common.Log.Debug("ERROR: Table of content containing non Page/Pages object! (%s)", objType)
+		common.Log.Error("Table of content containing non Page/Pages object! (%s)", objType)
 		return errors.New("Table of content containing non Page/Pages object!")
 	}
 
@@ -484,7 +484,7 @@ func (this *PdfReader) buildPageList(node *PdfIndirectObject, parent *PdfIndirec
 
 	kidsObj, err := this.parser.Trace((*nodeDict)["Kids"])
 	if err != nil {
-		common.Log.Debug("ERROR: Failed loading Kids object")
+		common.Log.Error("Failed loading Kids object")
 		return err
 	}
 
@@ -505,7 +505,7 @@ func (this *PdfReader) buildPageList(node *PdfIndirectObject, parent *PdfIndirec
 		common.Log.Debug("**Child: %d - %s", idx, child)
 		child, ok := child.(*PdfIndirectObject)
 		if !ok {
-			common.Log.Debug("ERROR: Page not indirect object - (%s)", child)
+			common.Log.Error("Page not indirect object - (%s)", child)
 			panic(errors.New("Page not indirect object"))
 			return errors.New("Page not indirect object")
 		}

pdf/utils.go

@@ -146,12 +146,7 @@ func (this *PdfParser) inspect() (map[string]int, error) {
 	return objTypes, nil
 }
 
-func ShowDict(w *os.File, name string, d *PdfObjectDictionary) {
+func ShowDict(w *os.File, name string, o PdfObject) {
-	keys := []string{}
-	for k := range *d {
-		keys = append(keys, string(k))
-	}
-	sort.Strings(keys)
 	_, file, line, ok := runtime.Caller(1)
 	if !ok {
 		file = "???"
@@ -159,10 +154,44 @@ func ShowDict(w *os.File, name string, d *PdfObjectDictionary) {
 	} else {
 		file = filepath.Base(file)
 	}
-	fmt.Fprintf(w, "ShowDict: %s:%d %q %d\n", file, line, name, len(*d))
+
-	for i, k := range keys {
+	if o == nil {
-		v := (*d)[PdfObjectName(k)]
+		fmt.Fprintf(w, "ShowDict: %s:%d %q nil\n", file, line, name)
+		return
+	}
 	ref := ""
+	if io, isIndirect := o.(*PdfIndirectObject); isIndirect {
+		o = io.PdfObject
+		ref = (*io).PdfObjectReference.String()
+	}
+	d := o.(*PdfObjectDictionary)
+	fmt.Fprintf(w, "ShowDict: %s:%d %q %d %s\n", file, line, name, len(*d), ref)
+	showDict(w, d, "")
+}
+
+func showDict(w *os.File, d *PdfObjectDictionary, indent string) {
+	for i, k := range sortedKeys(d) {
+		v := (*d)[PdfObjectName(k)]
+		if e, ok := v.(*PdfObjectDictionary); ok {
+			fmt.Fprintf(w, indent+"%4d: %#10q:\n", i, k)
+			showDict(w, e, indent+"  ")
+		} else {
+			fmt.Fprintf(w, indent+"%4d: %#10q: %s\n", i, k, ObjStr(v))
+		}
+	}
+}
+
+func sortedKeys(d *PdfObjectDictionary) []string {
+	keys := []string{}
+	for k := range *d {
+		keys = append(keys, string(k))
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+func ObjStr(v PdfObject) string {
+	ref := "--- ---"
 	if io, ok := v.(*PdfIndirectObject); ok {
 		v = (*io).PdfObject
 		ref = (*io).PdfObjectReference.String()
@@ -178,9 +207,15 @@ func ShowDict(w *os.File, name string, d *PdfObjectDictionary) {
 		s = fmt.Sprintf("%f", *x)
 	} else if b, ok := v.(*PdfObjectBool); ok {
 		s = fmt.Sprintf("%t", *b)
+	} else if x, ok := v.(*PdfObjectStream); ok {
+		s = fmt.Sprintf("%s %s", s, (*x).PdfObjectDictionary)
+	} else if d, ok := v.(*PdfObjectDictionary); ok {
+		s = fmt.Sprintf("%s %s", s, *d)
+	} else if d, ok := v.(*PdfObjectArray); ok {
+		s = fmt.Sprintf("%s %s", s, *d)
 	}
-		fmt.Fprintf(w, "%4d: %#20q: %10s %s\n", i, k, s, ref)
+
-	}
+	return fmt.Sprintf("%-9s %s", ref, s)
 }
 
 func Trace(obj PdfObject) PdfObject {

pdf/writer.go

@@ -16,6 +16,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"sort"
 	"time"
 
 	"github.com/unidoc/unidoc/common"
@@ -77,6 +78,83 @@ type PdfWriter struct {
 	ids         *PdfObjectArray
 }
 
+// Show prints information about a PdfWriter's contents
+func (this *PdfWriter) Show() {
+	typeCounts := map[string]int{}
+
+	common.Log.Info("-PdfWriter.Show ========================================")
+	fmt.Printf("root=%s\n", Trace(this.root))
+	fmt.Printf("catalog=%s\n", Trace(this.pages))
+	fmt.Printf("infoObj=%s\n", Trace(this.infoObj))
+	fmt.Printf("pages=%s\n", Trace(this.pages))
+	fmt.Printf("objects=%d\n", len(this.objects))
+	sort.Stable(byObject(this.objects))
+	for i, o := range this.objects {
+		_, _, t, u := ObjStreamType(o)
+		fmt.Printf("%10d: [%s:%s] %s\n", i, t, u, ObjStr(o))
+		typeCounts[t]++
+	}
+	fmt.Printf("ids=%s\n", Trace(this.ids))
+	common.Log.Info("+PdfWriter.Show ========================================")
+	for t, n := range typeCounts {
+		fmt.Printf("%#20q: %3d\n", t, n)
+	}
+}
+
+// byObject sorts slices of PdfObject by "Type" and "Subtype" keys. See ObjStreamType
+type byObject []PdfObject
+
+func (x byObject) Len() int { return len(x) }
+
+func (x byObject) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (x byObject) Less(i, j int) bool {
+	si, di, ti, ui := ObjStreamType(x[i])
+	sj, dj, tj, uj := ObjStreamType(x[j])
+
+	if ti != tj {
+		return ti > tj
+	}
+	if ui != uj {
+		return ui > uj
+	}
+	if si != sj {
+		return si
+	}
+	if di != dj {
+		return si
+	}
+	return false
+}
+
+// ObjStreamType returns information about streams and dicts: isStream, isDict, typ, subtyp
+//	isStream: is `o`a PdfObjectStream?
+//	isDict: is `o`a PdfObjectDictionary?
+//	type: "Type" value of dict or stream
+//	type: "Subtype" value of dict or stream
+func ObjStreamType(o PdfObject) (isStream, isDict bool, typ, subtyp string) {
+	if io, ok := o.(*PdfIndirectObject); ok {
+		o = (*io).PdfObject
+	}
+	var d *PdfObjectDictionary = nil
+	if s, ok := o.(*PdfObjectStream); ok {
+		d = (*s).PdfObjectDictionary
+		isStream = true
+	} else if s, ok := o.(*PdfObjectDictionary); ok {
+		d = s
+		isDict = true
+	}
+	if d != nil {
+		if v, ok := (*d)["Type"]; ok {
+			typ = string(*(v.(*PdfObjectName)))
+		}
+		if v, ok := (*d)["Subtype"]; ok {
+			subtyp = string(*(v.(*PdfObjectName)))
+		}
+	}
+	return
+}
+
 func NewPdfWriter() PdfWriter {
 	w := PdfWriter{}
 
@@ -211,7 +289,7 @@ func (this *PdfWriter) addObjects(obj PdfObject) error {
 
 	if _, isReference := obj.(*PdfObjectReference); isReference {
 		// Should never be a reference, should already be resolved.
-		common.Log.Debug("ERROR: Cannot be a reference!")
+		common.Log.Error("Cannot be a reference!")
 		return errors.New("Reference not allowed")
 	}