d2font: fixed bug, when was unable to create new file doing just &Font{}.Marshal()

d2common/d2fileformats/d2font/d2fontglyph/font_glyph.go

@@ -6,9 +6,6 @@ func Create(frame, width, height int) *FontGlyph {
 	// nolint:gomnd // thes bytes are constant
 	// comes from https://d2mods.info/forum/viewtopic.php?t=42044
 	result := &FontGlyph{
-		unknown1: []byte{0},
-		unknown2: []byte{1, 0, 0},
-		unknown3: []byte{0, 0, 0, 0},
 		frame:  frame,
 		width:  width,
 		height: height,
@@ -19,9 +16,6 @@ func Create(frame, width, height int) *FontGlyph {
 
 // FontGlyph represents a single font glyph
 type FontGlyph struct {
-	unknown1 []byte
-	unknown2 []byte
-	unknown3 []byte
 	frame  int
 	width  int
 	height int
@@ -59,15 +53,15 @@ func (fg *FontGlyph) FrameIndex() int {
 
 // Unknown1 returns unknowns bytes
 func (fg *FontGlyph) Unknown1() []byte {
-	return fg.unknown1
+	return []byte{0}
 }
 
 // Unknown2 returns unknowns bytes
 func (fg *FontGlyph) Unknown2() []byte {
-	return fg.unknown2
+	return []byte{1, 0, 0}
 }
 
 // Unknown3 returns unknowns bytes
 func (fg *FontGlyph) Unknown3() []byte {
-	return fg.unknown3
+	return []byte{0, 0, 0, 0}
 }

d2common/d2fileformats/d2font/font.go

@@ -27,7 +27,6 @@ const (
 
 // Font represents a displayable font
 type Font struct {
-	unknownHeaderBytes []byte
 	sheet  d2interface.Animation
 	table  []byte
 	Glyphs map[rune]*d2fontglyph.FontGlyph
@@ -52,10 +51,7 @@ func Load(data []byte) (*Font, error) {
 		color: color.White,
 	}
 
-	font.unknownHeaderBytes, err = sr.ReadBytes(unknownHeaderBytesCount)
+	sr.SkipBytes(unknownHeaderBytesCount)
-	if err != nil {
-		return nil, err
-	}
 
 	err = font.initGlyphs(sr)
 	if err != nil {
@@ -149,10 +145,11 @@ func (f *Font) RenderText(text string, target d2interface.Surface) error {
 func (f *Font) initGlyphs(sr *d2datautils.StreamReader) error {
 	glyphs := make(map[rune]*d2fontglyph.FontGlyph)
 
-	for i := numHeaderBytes; i < len(f.table); i += bytesPerGlyph {
+	// for i := numHeaderBytes; i < len(f.table); i += bytesPerGlyph {
+	for i := numHeaderBytes; true; i += bytesPerGlyph {
 		code, err := sr.ReadUInt16()
 		if err != nil {
-			return err
+			break
 		}
 
 		// byte of 0
@@ -194,7 +191,13 @@ func (f *Font) Marshal() []byte {
 	sw := d2datautils.CreateStreamWriter()
 
 	sw.PushBytes([]byte("Woo!\x01")...)
-	sw.PushBytes(f.unknownHeaderBytes...)
+
+	// unknown header bytes - constant
+	sw.PushBytes([]byte{1, 0, 0, 0, 0, 1}...)
+
+	// Expected Height of character cell and Expected Width of character cell
+	// not used in decoder
+	sw.PushBytes([]byte{0, 0}...)
 
 	for c, i := range f.Glyphs {
 		sw.PushUint16(uint16(c))