Caleb Gardner
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package inode
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"io"
|
|
"math"
|
|
)
|
|
|
|
type File struct {
|
|
BlockStart uint32
|
|
FragInd uint32
|
|
FragOffset uint32
|
|
Size uint32
|
|
BlockSizes []uint32
|
|
}
|
|
|
|
type eFileInit struct {
|
|
BlockStart uint64
|
|
Size uint64
|
|
Sparse uint64
|
|
LinkCount uint32
|
|
FragInd uint32
|
|
FragOffset uint32
|
|
XattrInd uint32
|
|
}
|
|
|
|
type EFile struct {
|
|
eFileInit
|
|
BlockSizes []uint32
|
|
}
|
|
|
|
func ReadFile(r io.Reader, blockSize uint32) (f File, err error) {
|
|
dat := make([]byte, 16)
|
|
_, err = r.Read(dat)
|
|
if err != nil {
|
|
return
|
|
}
|
|
f.BlockStart = binary.LittleEndian.Uint32(dat)
|
|
f.FragInd = binary.LittleEndian.Uint32(dat[4:])
|
|
f.FragOffset = binary.LittleEndian.Uint32(dat[8:])
|
|
f.Size = binary.LittleEndian.Uint32(dat[12:])
|
|
toRead := int(math.Floor(float64(f.Size) / float64(blockSize)))
|
|
if f.FragInd == 0xFFFFFFFF && f.Size%blockSize > 0 {
|
|
toRead++
|
|
}
|
|
dat = make([]byte, toRead*4)
|
|
_, err = r.Read(dat)
|
|
if err != nil {
|
|
return
|
|
}
|
|
f.BlockSizes = make([]uint32, toRead)
|
|
for i := range toRead {
|
|
f.BlockSizes[i] = binary.LittleEndian.Uint32(dat[i*4:])
|
|
}
|
|
return
|
|
}
|
|
|
|
func ReadEFile(r io.Reader, blockSize uint32) (f EFile, err error) {
|
|
err = binary.Read(r, binary.LittleEndian, &f.eFileInit)
|
|
if err != nil {
|
|
return
|
|
}
|
|
toRead := int(math.Floor(float64(f.Size) / float64(blockSize)))
|
|
if f.FragInd == 0xFFFFFFFF && f.Size%uint64(blockSize) > 0 {
|
|
toRead++
|
|
}
|
|
f.BlockSizes = make([]uint32, toRead)
|
|
err = binary.Read(r, binary.LittleEndian, &f.BlockSizes)
|
|
return
|
|
}
|