I CAN READ A DIRECTORY NOW

I've only tested it with the root dir, but should work for all directories.
This commit is contained in:
Caleb Gardner
2020-11-19 10:50:02 -06:00
parent be1be40a17
commit 87ccd0f346
5 changed files with 74 additions and 60 deletions
+43 -39
View File
@@ -1,10 +1,9 @@
package directory
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"math"
)
//Header is the header for a directory in the directory table
@@ -25,64 +24,69 @@ type EntryInit struct {
//Entry is an entry in a directory.
type Entry struct {
Init EntryInit
Name []byte
Name string
}
//NewEntry creates a new directory entry
func NewEntry(rdr io.Reader) (*Entry, error) {
func NewEntry(rdr io.Reader) (Entry, error) {
var entry Entry
err := binary.Read(rdr, binary.LittleEndian, &entry.Init)
if err != nil {
return nil, err
return Entry{}, err
}
entry.Name = make([]byte, entry.Init.NameSize+1)
err = binary.Read(rdr, binary.LittleEndian, &entry.Name)
tmp := make([]byte, entry.Init.NameSize+1)
err = binary.Read(rdr, binary.LittleEndian, &tmp)
if err != nil {
return nil, err
return Entry{}, err
}
return &entry, err
entry.Name = string(tmp)
return entry, err
}
//Directory is an entry in the directory table of a squashfs.
//Will only have multiple headers if there are more then 256 entries
type Directory struct {
Headers []Header
Entries []*Entry
Entries []Entry
}
//NewDirectory reads the directory from rdr
func NewDirectory(rdr io.Reader) (*Directory, error) {
func NewDirectory(base io.Reader, size uint16) (*Directory, error) {
var dir Directory
var hdr Header
err := binary.Read(rdr, binary.LittleEndian, &hdr)
if err != nil {
return nil, err
}
hdr.Count++
headers := hdr.Count / 256
if hdr.Count%256 > 0 {
headers++
}
fmt.Println("headers", headers)
fmt.Println("headers ceil", math.Ceil(float64(hdr.Count)/256))
headersRead := 1
dir.Headers = make([]Header, headers)
dir.Headers[0] = hdr
for i := uint32(0); i < hdr.Count; i++ {
if i != 0 && i%256 == 0 {
var newHdr Header
err = binary.Read(rdr, binary.LittleEndian, &newHdr)
if err != nil {
return &dir, err
var err error
tmp := make([]byte, size)
base.Read(tmp)
rdr := bytes.NewBuffer(tmp)
for {
var hdr Header
err = binary.Read(rdr, binary.LittleEndian, &hdr)
if err == io.ErrUnexpectedEOF {
break
} else if err != nil {
return nil, err
}
hdr.Count++
headers := hdr.Count / 256
if hdr.Count%256 > 0 {
headers++
}
dir.Headers = append(dir.Headers, hdr)
for i := uint32(0); i < hdr.Count; i++ {
if i != 0 && i%256 == 0 {
var newHdr Header
err = binary.Read(rdr, binary.LittleEndian, &newHdr)
if err != nil {
return nil, err
}
dir.Headers = append(dir.Headers, newHdr)
}
dir.Headers[headersRead] = newHdr
headersRead++
var ent Entry
ent, err = NewEntry(rdr)
if err != nil {
return nil, err
}
dir.Entries = append(dir.Entries, ent)
}
ent, err := NewEntry(rdr)
if err != nil {
return &dir, err
}
dir.Entries = append(dir.Entries, ent)
}
return &dir, nil
}