forked from akavel/rsrc
/
rsrc.go
218 lines (186 loc) · 5.39 KB
/
rsrc.go
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package main
import (
"encoding/binary"
"flag"
"fmt"
"io"
"os"
"reflect"
"regexp"
"strings"
"github.com/akavel/rsrc/binutil"
"github.com/akavel/rsrc/coff"
"github.com/akavel/rsrc/ico"
)
const (
RT_ICON = coff.RT_ICON
RT_GROUP_ICON = coff.RT_GROUP_ICON
RT_MANIFEST = coff.RT_MANIFEST
)
// on storing icons, see: http://blogs.msdn.com/b/oldnewthing/archive/2012/07/20/10331787.aspx
type GRPICONDIR struct {
ico.ICONDIR
Entries []GRPICONDIRENTRY
}
func (group GRPICONDIR) Size() int64 {
return int64(binary.Size(group.ICONDIR) + len(group.Entries)*binary.Size(group.Entries[0]))
}
type GRPICONDIRENTRY struct {
ico.IconDirEntryCommon
Id uint16
}
var usage = `USAGE:
%s [-manifest FILE.exe.manifest] [-ico FILE.ico[,FILE2.ico...]] -o FILE.syso
Generates a .syso file with specified resources embedded in .rsrc section,
aimed for consumption by Go linker when building Win32 excecutables.
The generated *.syso files should get automatically recognized by 'go build'
command and linked into an executable/library, as long as there are any *.go
files in the same directory.
OPTIONS:
`
func main() {
//TODO: allow in options advanced specification of multiple resources, as a tree (json?)
//FIXME: verify that data file size doesn't exceed uint32 max value
var fnamein, fnameico, fnamedata, fnameout string
flags := flag.NewFlagSet("", flag.ContinueOnError)
flags.StringVar(&fnamein, "manifest", "", "path to a Windows manifest file to embed")
flags.StringVar(&fnameico, "ico", "", "comma-separated list of paths to .ico files to embed")
flags.StringVar(&fnamedata, "data", "", "path to raw data file to embed [WARNING: useless for Go 1.4+]")
flags.StringVar(&fnameout, "o", "rsrc.syso", "name of output COFF (.res or .syso) file")
_ = flags.Parse(os.Args[1:])
if fnameout == "" || (fnamein == "" && fnamedata == "" && fnameico == "") {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flags.PrintDefaults()
os.Exit(1)
}
var err error
switch {
case fnamein != "" || fnameico != "":
err = run(fnamein, fnameico, fnameout)
case fnamedata != "":
err = rundata(fnamedata, fnameout)
}
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func rundata(fnamedata, fnameout string) error {
if !strings.HasSuffix(fnameout, ".syso") {
return fmt.Errorf("Output file name '%s' must end with '.syso'", fnameout)
}
symname := strings.TrimSuffix(fnameout, ".syso")
ok, err := regexp.MatchString(`^[a-z0-9_]+$`, symname)
if err != nil {
return fmt.Errorf("Internal error: %s", err)
}
if !ok {
return fmt.Errorf("Output file name '%s' must be composed of only lowercase letters (a-z), digits (0-9) and underscore (_)", fnameout)
}
dat, err := binutil.SizedOpen(fnamedata)
if err != nil {
return fmt.Errorf("Error opening data file '%s': %s", fnamedata, err)
}
defer dat.Close()
coff := coff.NewRDATA()
coff.AddData("_brsrc_"+symname, dat)
coff.AddData("_ersrc_"+symname, io.NewSectionReader(strings.NewReader("\000\000"), 0, 2)) // TODO: why? copied from as-generated
coff.Freeze()
err = write(coff, fnameout)
if err != nil {
return err
}
//FIXME: output a .c file
fmt.Println(strings.Replace(`#include "runtime.h"
extern byte _brsrc_NAME[], _ersrc_NAME;
/* func get_NAME() []byte */
void ·get_NAME(Slice a) {
a.array = _brsrc_NAME;
a.len = a.cap = &_ersrc_NAME - _brsrc_NAME;
FLUSH(&a);
}`, "NAME", symname, -1))
return nil
}
func run(fnamein, fnameico, fnameout string) error {
newid := make(chan uint16)
go func() {
for i := uint16(1); ; i++ {
newid <- i
}
}()
coff := coff.NewRSRC()
if fnamein != "" {
manifest, err := binutil.SizedOpen(fnamein)
if err != nil {
return fmt.Errorf("Error opening manifest file '%s': %s", fnamein, err)
}
defer manifest.Close()
id := <-newid
coff.AddResource(RT_MANIFEST, id, manifest)
fmt.Println("Manifest ID: ", id)
}
if fnameico != "" {
for _, fnameicosingle := range strings.Split(fnameico, ",") {
err := addicon(coff, fnameicosingle, newid)
if err != nil {
return err
}
}
}
coff.Freeze()
return write(coff, fnameout)
}
func addicon(coff *coff.Coff, fname string, newid <-chan uint16) error {
f, err := os.Open(fname)
if err != nil {
return err
}
//defer f.Close() don't defer, files will be closed by OS when app closes
icons, err := ico.DecodeHeaders(f)
if err != nil {
return err
}
if len(icons) > 0 {
// RT_ICONs
group := GRPICONDIR{ICONDIR: ico.ICONDIR{
Reserved: 0, // magic num.
Type: 1, // magic num.
Count: uint16(len(icons)),
}}
for _, icon := range icons {
id := <-newid
r := io.NewSectionReader(f, int64(icon.ImageOffset), int64(icon.BytesInRes))
coff.AddResource(RT_ICON, id, r)
group.Entries = append(group.Entries, GRPICONDIRENTRY{icon.IconDirEntryCommon, id})
}
id := <-newid
coff.AddResource(RT_GROUP_ICON, id, group)
fmt.Println("Icon ", fname, " ID: ", id)
}
return nil
}
func write(coff *coff.Coff, fnameout string) error {
out, err := os.Create(fnameout)
if err != nil {
return err
}
defer out.Close()
w := binutil.Writer{W: out}
// write the resulting file to disk
binutil.Walk(coff, func(v reflect.Value, path string) error {
if binutil.Plain(v.Kind()) {
w.WriteLE(v.Interface())
return nil
}
vv, ok := v.Interface().(binutil.SizedReader)
if ok {
w.WriteFromSized(vv)
return binutil.WALK_SKIP
}
return nil
})
if w.Err != nil {
return fmt.Errorf("Error writing output file: %s", w.Err)
}
return nil
}