Further work on Inode

README.md

@@ -5,17 +5,17 @@ Right Now it's mostly based on [distri's squashfs library](https://github.com/di
 
 Special thanks to https://dr-emann.github.io/squashfs/ for some VERY important information in an easy to understand format
 
-# Ideas
+I am focusing purely on unsquashing before squashing. 
-* Link directly to squashfs-tool using cgo
+
-  * cgo can be a butt
+# Working
-  * Would require the least amount of code for me to do
+
-  * Doing things in pure Go is definately highly superior
+* Reading the header
-* Improve [distri's](https://github.com/distr1/distri) or [diskfs](https://github.com/diskfs/go-diskfs) squashfs library to meet my needs
+* (Maybe) reading gzip compressed data
-  * Both don't work at all ATM.
+
-  * distri's doesn't seem to support any sort of compression, which causes issues all over the place.
+# Not Working (Yet). Roughly in order.
-  * diskfs seems closer, but the squashfs code is incomplete
+
-* Create an original squashfs library
+* Actually reading the compressed data
-  * MUCH more research needed
+* Reading Inodes
-  * Could look at [squashfs-tools'](https://github.com/plougher/squashfs-tools) code to help out
+* Reading the Directory structure
-  * Don't have to deal with other people's code :P
+* Implement other compression types
-  * Honestly a bit unnecessary based on how close distri & diskfs's code is AND how little I know about squashfs.
+* Squashing

internal/inode/inode.go

@@ -1,6 +1,12 @@
 package inode
 
-type CommonHeader struct {
+import (
+	"encoding/binary"
+	"io"
+)
+
+//InodeCommon is the comon header for all inodes
+type InodeCommon struct {
 	InodeType    uint16
 	Permissions  uint16
 	UID          uint16
@@ -9,6 +15,7 @@ type CommonHeader struct {
 	Number       uint32
 }
 
+//BasicDirectory is self explainatory
 type BasicDirectory struct {
 	DirectoryIndex    uint32
 	HardLinks         uint32
@@ -17,6 +24,7 @@ type BasicDirectory struct {
 	ParentInodeNumber uint32
 }
 
+//ExtendedDirectoryInit is the information that can be directoy decoded
 type ExtendedDirectoryInit struct {
 	HardLinks         uint32
 	DirectorySize     uint32
@@ -27,19 +35,31 @@ type ExtendedDirectoryInit struct {
 	XattrIndex        uint32
 }
 
+//ExtendedDirectory is a directory with extra info
 type ExtendedDirectory struct {
-	ExtendedDirectoryInit
+	Init ExtendedDirectoryInit
-	//TODO indexes []DirectoryIndex
+	//TODO: indexes []DirectoryIndex
 }
 
+//NewExtendedDirectory creates a new ExtendedDirectory
+func NewExtendedDirectory(rdr *io.Reader) (*ExtendedDirectory, error) {
+	var inode ExtendedDirectory
+	err := binary.Read(*rdr, binary.LittleEndian, inode.Init)
+	//TODO: Read directory indexes
+	return &inode, err
+}
+
+//BasicFile is self explainatory
 type BasicFile struct {
 	BlockStart     uint32
 	FragmentIndex  uint32
 	FragmentOffset uint32
 	Size           uint32
 	BlockSizes     []uint32
+	//TODO: possibly fix BlockSizes
 }
 
+//ExtendedFile is a file with additional information
 type ExtendedFile struct {
 	BlockStart     uint32
 	Size           uint32
@@ -49,6 +69,7 @@ type ExtendedFile struct {
 	FragmentOffset uint32
 	XattrIndex     uint32
 	BlockSizes     []uint32
+	//TODO: possibly fix BlockSizes
 }
 
 type BasicSymlinkInit struct {
@@ -57,8 +78,19 @@ type BasicSymlinkInit struct {
 }
 
 type BasicSymlink struct {
-	BasicSymlinkInit
+	Init       BasicSymlinkInit
-	targetPath []byte //len is TargetPathSize
+	targetPath []uint8 //len is TargetPathSize
+}
+
+func NewBasicSymlink(rdr *io.Reader) (*BasicSymlink, error) {
+	var inode BasicSymlink
+	err := binary.Read(*rdr, binary.LittleEndian, inode.Init)
+	if err != nil {
+		return nil, err
+	}
+	inode.targetPath = make([]uint8, inode.Init.TargetPathSize)
+	err = binary.Read(*rdr, binary.LittleEndian, inode.targetPath)
+	return &inode, err
 }
 
 type ExtendedSymlinkInit struct {
@@ -67,10 +99,22 @@ type ExtendedSymlinkInit struct {
 }
 
 type ExtendedSymlink struct {
-	targetPath []byte
+	Init       ExtendedSymlinkInit
+	TargetPath []uint8
 	XattrIndex uint32
 }
 
+func NewExtendedSymlink(rdr *io.Reader) (*ExtendedSymlink, error) {
+	var inode ExtendedSymlink
+	err := binary.Read(*rdr, binary.LittleEndian, inode.Init)
+	if err != nil {
+		return &inode, err
+	}
+	inode.TargetPath = make([]uint8, inode.Init.TargetPathSize)
+	err = binary.Read(*rdr, binary.LittleEndian, &inode.XattrIndex)
+	return &inode, err
+}
+
 type BasicDevice struct {
 	HardLinks uint32
 	Device    uint32

internal/inode/processInode.go

@@ -0,0 +1,89 @@
+package inode
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+	"strconv"
+)
+
+const (
+	basicDirectory = iota + 1
+	basicFile
+	basicSymlink
+	basicBlockDevice
+	basicCharDevice
+	basicFifo
+	basicSocket
+	extendedDirectory
+	extendedFile
+	extendedSymlink
+	extendedBlockDevice
+	extendedCharDevice
+	extendedFifo
+	extendedSocket
+)
+
+func ProcessInode(rdr *io.Reader) (*InodeCommon, interface{}, error) {
+	var inodeHeader InodeCommon
+	err := binary.Read(*rdr, binary.LittleEndian, &inodeHeader)
+	if err != nil {
+		return nil, nil, err
+	}
+	switch inodeHeader.InodeType {
+	case basicDirectory:
+		var inode BasicDirectory
+		err = binary.Read(*rdr, binary.LittleEndian, &inode)
+		return &inodeHeader, inode, err
+	case basicFile:
+		var inode BasicFile
+		err = binary.Read(*rdr, binary.LittleEndian, &inode)
+		return &inodeHeader, inode, err
+	case basicSymlink:
+		inode, err := NewBasicSymlink(rdr)
+		return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	// case basicFile:
+	// 	var inode BasicFile
+	// 	err = binary.Read(*rdr, binary.LittleEndian, &inode)
+	// 	return &inodeHeader, inode, err
+	//TODO: implement ALL cases
+	default:
+		return nil, nil, errors.New("Inode type is unrecognized: " + strconv.FormatInt(int64(inodeHeader.InodeType), 2))
+	}
+}

reader.go

@@ -56,7 +56,7 @@ func (r *Reader) Seek(offset int64, whence int) (int64, error) {
 		n, err := r.Read(make([]byte, offset))
 		return int64(n), err
 	case io.SeekEnd:
-		return 0, errors.New("SeekEnd is NOT currently supported")
+		return 0, errors.New("SeekEnd is NOT supported")
 	}
 	return 0, errors.New("incorrect whence")
 }