github.com/decomp/exp@v0.0.0-20210624183419-6d058f5e1da6/cmd/bin2asm/overlay.go (about)

     1  package main
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  	"io/ioutil"
     7  	"path/filepath"
     8  
     9  	"github.com/pkg/errors"
    10  )
    11  
    12  // dumpOverlay dumps the overlay of the PE file in NASM syntax.
    13  func dumpOverlay(overlay []byte) error {
    14  	buf := &bytes.Buffer{}
    15  	for _, b := range overlay {
    16  		// Dump data.
    17  		//
    18  		//    db      0x44 ; 'D'
    19  		char := ""
    20  		if isPrint(b) {
    21  			char = fmt.Sprintf(" ; %q", b)
    22  		}
    23  		fmt.Fprintf(buf, "        db      0x%02X%s\n", b, char)
    24  	}
    25  	filename := "overlay.asm"
    26  	outPath := filepath.Join(outDir, filename)
    27  	dbg.Printf("creating %q\n", outPath)
    28  	if err := ioutil.WriteFile(outPath, buf.Bytes(), 0644); err != nil {
    29  		return errors.WithStack(err)
    30  	}
    31  	return nil
    32  }