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fat.go
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fat.go
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package lmacho
import (
"debug/macho"
"errors"
"fmt"
"io"
"os"
)
const MagicFat = macho.MagicFat
// FatHeader presents a header for a fat 32 bit and fat 64 bit
// see /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach-o/fat.h
type FatHeader struct {
Magic uint32
NArch uint32
}
// FatArchHeader presents an architecture header for a Macho-0 32 bit and 64 bit
type FatArchHeader struct {
Cpu Cpu
SubCpu SubCpu
Offset uint64
Size uint64
Align uint32
}
type Object interface {
CPU() Cpu
SubCPU() SubCpu
Size() uint64
Align() uint32
Type() macho.Type
CPUString() string
io.Reader
io.ReaderAt
}
var (
_ Object = &FatArch{}
_ Object = &Arch{}
)
// FatArch presents an object of fat file
type FatArch struct {
faHdr FatArchHeader
Hidden bool
typ macho.Type
sr *io.SectionReader
}
func (fa *FatArch) CPU() Cpu {
return fa.faHdr.Cpu
}
func (fa *FatArch) SubCPU() SubCpu {
return fa.faHdr.SubCpu
}
func (fa *FatArch) Size() uint64 {
return fa.faHdr.Size
}
func (fa *FatArch) Align() uint32 {
return fa.faHdr.Align
}
func (fa *FatArch) Type() macho.Type {
return fa.typ
}
func (fa *FatArch) Offset() uint64 {
return fa.faHdr.Offset
}
func (fa *FatArch) CPUString() string {
return ToCpuString(fa.CPU(), fa.SubCPU())
}
func (fa *FatArch) Read(p []byte) (int, error) {
return fa.sr.Read(p)
}
func (fa *FatArch) ReadAt(p []byte, off int64) (int, error) {
return fa.sr.ReadAt(p, off)
}
func (fa *FatArch) Seek(offset int64, whence int) (int64, error) {
return fa.sr.Seek(offset, whence)
}
// Arch presents an object of thin file
type Arch struct {
cpu Cpu
subCpu SubCpu
align uint32
typ macho.Type
sr *io.SectionReader
}
func (a *Arch) CPU() Cpu {
return a.cpu
}
func (a *Arch) SubCPU() SubCpu {
return a.subCpu
}
func (a *Arch) Size() uint64 {
return uint64(a.sr.Size())
}
func (a *Arch) Align() uint32 {
return a.align
}
func (a *Arch) Type() macho.Type {
return a.typ
}
func (a *Arch) CPUString() string {
return ToCpuString(a.CPU(), a.SubCPU())
}
func (a *Arch) Read(p []byte) (int, error) {
return a.sr.Read(p)
}
func (a *Arch) ReadAt(p []byte, off int64) (int, error) {
return a.sr.ReadAt(p, off)
}
func (a *Arch) Seek(offset int64, whence int) (int64, error) {
return a.sr.Seek(offset, whence)
}
type FormatError struct {
Err error
}
func (e *FormatError) Error() string {
return fmt.Sprintf("invalid file format %s", e.Err.Error())
}
type FatFile struct {
FatHeader
Arches []*FatArch
}
// NewFatFile is wrapper for Fat Reader
func NewFatFile(ra io.ReaderAt) (*FatFile, error) {
r, err := NewFatReader(ra)
if err != nil {
return nil, err
}
fa := &FatFile{
Arches: make([]*FatArch, 0),
FatHeader: r.FatHeader,
}
for {
a, err := r.Next()
if err != nil {
if errors.Is(err, io.EOF) {
break
}
return nil, err
}
fa.Arches = append(fa.Arches, a)
}
return fa, nil
}
func NewArch(sr *io.SectionReader) (*Arch, error) {
mf, err := macho.NewFile(sr)
if err != nil {
return nil, err
}
if _, err := sr.Seek(0, io.SeekStart); err != nil {
return nil, err // TODO detail error
}
align := SegmentAlignBit(mf)
if mf.Type == macho.TypeObj {
alignBitMin := alignBitMin64
if mf.Magic == macho.Magic32 {
alignBitMin = alignBitMin32
}
align = GuessAlignBit(uint64(os.Getpagesize()), alignBitMin, alignBitMax)
}
return &Arch{
cpu: mf.Cpu,
subCpu: mf.SubCpu,
typ: mf.Type,
align: align,
sr: sr,
}, nil
}
func FatHeaderSize() uint64 {
// sizeof(FatHeader) = uint32 * 2
return uint64(4 * 2)
}
func FatArchHeaderSize(magic uint32) uint64 {
if magic == MagicFat64 {
// sizeof(Fat64ArchHeader) = uint32 * 4 + uint64 * 2
return uint64(4*4 + 8*2)
}
// sizeof(macho.FatArchHeader) = uint32 * 5
return uint64(4 * 5)
}