add an isodump cmd

Author: davidnewhall

cmd/isodump/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/kdomanski/iso9660"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		log.Fatalf("usage: %s <filename.iso>", os.Args[0])
+	}
+
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalf("failed to open %s: %s", os.Args[1], err)
+	}
+	defer f.Close()
+
+	iso, err := iso9660.OpenImage(f)
+	if err != nil {
+		log.Fatalf("failed to open image %s: %s", os.Args[1], err)
+	}
+
+	root, err := iso.RootDir()
+	if err != nil {
+		log.Fatalf("failed to open iso root %s: %s", os.Args[1], err)
+	}
+
+	if err := printEntries(root, []string{}); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func printEntries(file *iso9660.File, parents []string) error {
+	if len(parents) > 1 && (file.Name() == "\x00" || file.Name() == "\x01") {
+		return nil
+	}
+
+	printEntry(file, parents)
+
+	if !file.IsDir() {
+		return nil
+	}
+
+	childs, err := file.GetChildren()
+	if err != nil {
+		return fmt.Errorf("getting children for %s: %w", file.Name(), err)
+	}
+
+	for _, entry := range childs {
+		if err := printEntries(entry, append(parents, file.Name())); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func printEntry(file *iso9660.File, parents []string) {
+	path := path.Join(append(parents, file.Name())...)
+	path = strings.ReplaceAll(path, "\x00", ".")
+	path = strings.ReplaceAll(path, "\x01", "..")
+
+	fmt.Printf("%q age: %v bytes: %v, me: %v\n",
+		path,
+		time.Since(file.ModTime()).Round(time.Second),
+		file.Size(), file.HasMultiExtent())
+}

image_reader.go

@@ -82,6 +82,11 @@ func (f *File) IsDir() bool {
 	return f.de.FileFlags&dirFlagDir != 0
 }
 
+// HasMultiExtent is for 'testing' ISO data.
+func (f *File) HasMultiExtent() bool {
+	return f.de.FileFlags&dirFlagMultiExtent != 0
+}
+
 // ModTime returns the entry's recording time
 func (f *File) ModTime() time.Time {
 	return time.Time(f.de.RecordingDateTime)

iso9660.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log"
 	"strconv"
 	"strings"
 	"time"
@@ -178,6 +179,7 @@ func (de *DirectoryEntry) UnmarshalBinary(data []byte) error {
 	identifierLen := data[32]
 	de.Identifier = string(data[33 : 33+identifierLen])
 
+	log.Printf("DEBUG: %b %q %q", de.FileFlags, de.Identifier, string(data))
 	// add padding if identifier length was even]
 	idPaddingLen := (identifierLen + 1) % 2
 	de.SystemUse = data[33+identifierLen+idPaddingLen : length]