// Copyright 2009 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package pe implements access to PE (Microsoft Windows Portable Executable) files.
package pe

import (
	"debug/dwarf"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"os"
	"strconv"
)

// A File represents an open PE file.
type File struct {
	FileHeader
	OptionalHeader interface{} // of type *OptionalHeader32 or *OptionalHeader64
	Sections       []*Section
	Symbols        []*Symbol

	closer io.Closer
}

type SectionHeader struct {
	Name                 string
	VirtualSize          uint32
	VirtualAddress       uint32
	Size                 uint32
	Offset               uint32
	PointerToRelocations uint32
	PointerToLineNumbers uint32
	NumberOfRelocations  uint16
	NumberOfLineNumbers  uint16
	Characteristics      uint32
}

type Section struct {
	SectionHeader

	// Embed ReaderAt for ReadAt method.
	// Do not embed SectionReader directly
	// to avoid having Read and Seek.
	// If a client wants Read and Seek it must use
	// Open() to avoid fighting over the seek offset
	// with other clients.
	io.ReaderAt
	sr *io.SectionReader
}

type Symbol struct {
	Name          string
	Value         uint32
	SectionNumber int16
	Type          uint16
	StorageClass  uint8
}

type ImportDirectory struct {
	OriginalFirstThunk uint32
	TimeDateStamp      uint32
	ForwarderChain     uint32
	Name               uint32
	FirstThunk         uint32

	dll string
}

// Data reads and returns the contents of the PE section.
func (s *Section) Data() ([]byte, error) {
	dat := make([]byte, s.sr.Size())
	n, err := s.sr.ReadAt(dat, 0)
	if n == len(dat) {
		err = nil
	}
	return dat[0:n], err
}

// Open returns a new ReadSeeker reading the PE section.
func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }

type FormatError struct {
	off int64
	msg string
	val interface{}
}

func (e *FormatError) Error() string {
	msg := e.msg
	if e.val != nil {
		msg += fmt.Sprintf(" '%v'", e.val)
	}
	msg += fmt.Sprintf(" in record at byte %#x", e.off)
	return msg
}

// Open opens the named file using os.Open and prepares it for use as a PE binary.
func Open(name string) (*File, error) {
	f, err := os.Open(name)
	if err != nil {
		return nil, err
	}
	ff, err := NewFile(f)
	if err != nil {
		f.Close()
		return nil, err
	}
	ff.closer = f
	return ff, nil
}

// Close closes the File.
// If the File was created using NewFile directly instead of Open,
// Close has no effect.
func (f *File) Close() error {
	var err error
	if f.closer != nil {
		err = f.closer.Close()
		f.closer = nil
	}
	return err
}

var (
	sizeofOptionalHeader32 = uint16(binary.Size(OptionalHeader32{}))
	sizeofOptionalHeader64 = uint16(binary.Size(OptionalHeader64{}))
)

// NewFile creates a new File for accessing a PE binary in an underlying reader.
func NewFile(r io.ReaderAt) (*File, error) {
	f := new(File)
	sr := io.NewSectionReader(r, 0, 1<<63-1)

	var dosheader [96]byte
	if _, err := r.ReadAt(dosheader[0:], 0); err != nil {
		return nil, err
	}
	var base int64
	if dosheader[0] == 'M' && dosheader[1] == 'Z' {
		signoff := int64(binary.LittleEndian.Uint32(dosheader[0x3c:]))
		var sign [4]byte
		r.ReadAt(sign[:], signoff)
		if !(sign[0] == 'P' && sign[1] == 'E' && sign[2] == 0 && sign[3] == 0) {
			return nil, errors.New("Invalid PE File Format.")
		}
		base = signoff + 4
	} else {
		base = int64(0)
	}
	sr.Seek(base, os.SEEK_SET)
	if err := binary.Read(sr, binary.LittleEndian, &f.FileHeader); err != nil {
		return nil, err
	}
	if f.FileHeader.Machine != IMAGE_FILE_MACHINE_UNKNOWN && f.FileHeader.Machine != IMAGE_FILE_MACHINE_AMD64 && f.FileHeader.Machine != IMAGE_FILE_MACHINE_I386 {
		return nil, errors.New("Invalid PE File Format.")
	}

	var ss []byte
	if f.FileHeader.NumberOfSymbols > 0 {
		// Get COFF string table, which is located at the end of the COFF symbol table.
		sr.Seek(int64(f.FileHeader.PointerToSymbolTable+COFFSymbolSize*f.FileHeader.NumberOfSymbols), os.SEEK_SET)
		var l uint32
		if err := binary.Read(sr, binary.LittleEndian, &l); err != nil {
			return nil, err
		}
		ss = make([]byte, l)
		if _, err := r.ReadAt(ss, int64(f.FileHeader.PointerToSymbolTable+COFFSymbolSize*f.FileHeader.NumberOfSymbols)); err != nil {
			return nil, err
		}

		// Process COFF symbol table.
		sr.Seek(int64(f.FileHeader.PointerToSymbolTable), os.SEEK_SET)
		aux := uint8(0)
		for i := 0; i < int(f.FileHeader.NumberOfSymbols); i++ {
			cs := new(COFFSymbol)
			if err := binary.Read(sr, binary.LittleEndian, cs); err != nil {
				return nil, err
			}
			if aux > 0 {
				aux--
				continue
			}
			var name string
			if cs.Name[0] == 0 && cs.Name[1] == 0 && cs.Name[2] == 0 && cs.Name[3] == 0 {
				si := int(binary.LittleEndian.Uint32(cs.Name[4:]))
				name, _ = getString(ss, si)
			} else {
				name = cstring(cs.Name[:])
			}
			aux = cs.NumberOfAuxSymbols
			s := &Symbol{
				Name:          name,
				Value:         cs.Value,
				SectionNumber: cs.SectionNumber,
				Type:          cs.Type,
				StorageClass:  cs.StorageClass,
			}
			f.Symbols = append(f.Symbols, s)
		}
	}

	// Read optional header.
	sr.Seek(base, os.SEEK_SET)
	if err := binary.Read(sr, binary.LittleEndian, &f.FileHeader); err != nil {
		return nil, err
	}
	var oh32 OptionalHeader32
	var oh64 OptionalHeader64
	switch f.FileHeader.SizeOfOptionalHeader {
	case sizeofOptionalHeader32:
		if err := binary.Read(sr, binary.LittleEndian, &oh32); err != nil {
			return nil, err
		}
		if oh32.Magic != 0x10b { // PE32
			return nil, fmt.Errorf("pe32 optional header has unexpected Magic of 0x%x", oh32.Magic)
		}
		f.OptionalHeader = &oh32
	case sizeofOptionalHeader64:
		if err := binary.Read(sr, binary.LittleEndian, &oh64); err != nil {
			return nil, err
		}
		if oh64.Magic != 0x20b { // PE32+
			return nil, fmt.Errorf("pe32+ optional header has unexpected Magic of 0x%x", oh64.Magic)
		}
		f.OptionalHeader = &oh64
	}

	// Process sections.
	f.Sections = make([]*Section, f.FileHeader.NumberOfSections)
	for i := 0; i < int(f.FileHeader.NumberOfSections); i++ {
		sh := new(SectionHeader32)
		if err := binary.Read(sr, binary.LittleEndian, sh); err != nil {
			return nil, err
		}
		var name string
		if sh.Name[0] == '\x2F' {
			si, _ := strconv.Atoi(cstring(sh.Name[1:]))
			name, _ = getString(ss, si)
		} else {
			name = cstring(sh.Name[0:])
		}
		s := new(Section)
		s.SectionHeader = SectionHeader{
			Name:                 name,
			VirtualSize:          sh.VirtualSize,
			VirtualAddress:       sh.VirtualAddress,
			Size:                 sh.SizeOfRawData,
			Offset:               sh.PointerToRawData,
			PointerToRelocations: sh.PointerToRelocations,
			PointerToLineNumbers: sh.PointerToLineNumbers,
			NumberOfRelocations:  sh.NumberOfRelocations,
			NumberOfLineNumbers:  sh.NumberOfLineNumbers,
			Characteristics:      sh.Characteristics,
		}
		s.sr = io.NewSectionReader(r, int64(s.SectionHeader.Offset), int64(s.SectionHeader.Size))
		s.ReaderAt = s.sr
		f.Sections[i] = s
	}
	return f, nil
}

func cstring(b []byte) string {
	var i int
	for i = 0; i < len(b) && b[i] != 0; i++ {
	}
	return string(b[0:i])
}

// getString extracts a string from symbol string table.
func getString(section []byte, start int) (string, bool) {
	if start < 0 || start >= len(section) {
		return "", false
	}

	for end := start; end < len(section); end++ {
		if section[end] == 0 {
			return string(section[start:end]), true
		}
	}
	return "", false
}

// Section returns the first section with the given name, or nil if no such
// section exists.
func (f *File) Section(name string) *Section {
	for _, s := range f.Sections {
		if s.Name == name {
			return s
		}
	}
	return nil
}

func (f *File) DWARF() (*dwarf.Data, error) {
	// There are many other DWARF sections, but these
	// are the required ones, and the debug/dwarf package
	// does not use the others, so don't bother loading them.
	var names = [...]string{"abbrev", "info", "str"}
	var dat [len(names)][]byte
	for i, name := range names {
		name = ".debug_" + name
		s := f.Section(name)
		if s == nil {
			continue
		}
		b, err := s.Data()
		if err != nil && uint32(len(b)) < s.Size {
			return nil, err
		}
		dat[i] = b
	}

	abbrev, info, str := dat[0], dat[1], dat[2]
	return dwarf.New(abbrev, nil, nil, info, nil, nil, nil, str)
}

// ImportedSymbols returns the names of all symbols
// referred to by the binary f that are expected to be
// satisfied by other libraries at dynamic load time.
// It does not return weak symbols.
func (f *File) ImportedSymbols() ([]string, error) {
	pe64 := f.Machine == IMAGE_FILE_MACHINE_AMD64
	ds := f.Section(".idata")
	if ds == nil {
		// not dynamic, so no libraries
		return nil, nil
	}
	d, err := ds.Data()
	if err != nil {
		return nil, err
	}
	var ida []ImportDirectory
	for len(d) > 0 {
		var dt ImportDirectory
		dt.OriginalFirstThunk = binary.LittleEndian.Uint32(d[0:4])
		dt.Name = binary.LittleEndian.Uint32(d[12:16])
		dt.FirstThunk = binary.LittleEndian.Uint32(d[16:20])
		d = d[20:]
		if dt.OriginalFirstThunk == 0 {
			break
		}
		ida = append(ida, dt)
	}
	names, _ := ds.Data()
	var all []string
	for _, dt := range ida {
		dt.dll, _ = getString(names, int(dt.Name-ds.VirtualAddress))
		d, _ = ds.Data()
		// seek to OriginalFirstThunk
		d = d[dt.OriginalFirstThunk-ds.VirtualAddress:]
		for len(d) > 0 {
			if pe64 { // 64bit
				va := binary.LittleEndian.Uint64(d[0:8])
				d = d[8:]
				if va == 0 {
					break
				}
				if va&0x8000000000000000 > 0 { // is Ordinal
					// TODO add dynimport ordinal support.
				} else {
					fn, _ := getString(names, int(uint32(va)-ds.VirtualAddress+2))
					all = append(all, fn+":"+dt.dll)
				}
			} else { // 32bit
				va := binary.LittleEndian.Uint32(d[0:4])
				d = d[4:]
				if va == 0 {
					break
				}
				if va&0x80000000 > 0 { // is Ordinal
					// TODO add dynimport ordinal support.
					//ord := va&0x0000FFFF
				} else {
					fn, _ := getString(names, int(va-ds.VirtualAddress+2))
					all = append(all, fn+":"+dt.dll)
				}
			}
		}
	}

	return all, nil
}

// ImportedLibraries returns the names of all libraries
// referred to by the binary f that are expected to be
// linked with the binary at dynamic link time.
func (f *File) ImportedLibraries() ([]string, error) {
	// TODO
	// cgo -dynimport don't use this for windows PE, so just return.
	return nil, nil
}