From 55981730da8d98496c36b1ec5d8a62bf2f12cf55 Mon Sep 17 00:00:00 2001
From: Doc <Doctor_Luigi@aol.com>
Date: Mon, 18 Aug 2025 12:49:15 +0200
Subject: [PATCH] added parsing of map lumps

---
 internal/mapfmt/map.go | 72 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 1 deletion(-)

diff --git a/internal/mapfmt/map.go b/internal/mapfmt/map.go
index 4799dbe..02ad208 100644
--- a/internal/mapfmt/map.go
+++ b/internal/mapfmt/map.go
@@ -1,3 +1,73 @@
+// Parsen der Lump aus wad.go zu go structs
 package mapfmt
 
-//init
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+type Vertex struct {
+	X int16
+	Y int16
+}
+
+type Linedef struct {
+	V1, V2    uint16
+	Flags     uint16
+	Special   uint16
+	Tag       uint16
+	RightSide int16
+	LeftSide  int16
+}
+
+type MapData struct {
+	Vertices []Vertex
+	Linedefs []Linedef
+}
+
+// Parsen der Vertices Lumps
+func ParseVertices(data []byte) ([]Vertex, error) {
+	if len(data)%4 != 0 {
+		return nil, fmt.Errorf("VERTEXES size %d not multiple of 4", len(data))
+	}
+	n := len(data) / 4
+	verts := make([]Vertex, n)
+	for i := 0; i < n; i++ {
+		verts[i].X = int16(binary.LittleEndian.Uint16(data[i*4:]))
+		verts[i].Y = int16(binary.LittleEndian.Uint16(data[i*4+2:]))
+	}
+	return verts, nil
+}
+
+// Parsen der Linedef Lumps
+func ParseLinedefs(data []byte) ([]Linedef, error) {
+	if len(data)%14 != 0 {
+		return nil, fmt.Errorf("LINEDEFS size %d not multiple of 14", len(data))
+	}
+	n := len(data) / 14
+	lines := make([]Linedef, n)
+	for i := 0; i < n; i++ {
+		base := i * 14
+		lines[i].V1 = binary.LittleEndian.Uint16(data[base:])
+		lines[i].V2 = binary.LittleEndian.Uint16(data[base+2:])
+		lines[i].Flags = binary.LittleEndian.Uint16(data[base+4:])
+		lines[i].Special = binary.LittleEndian.Uint16(data[base+6:])
+		lines[i].Tag = binary.LittleEndian.Uint16(data[base+8:])
+		lines[i].RightSide = int16(binary.LittleEndian.Uint16(data[base+10:]))
+		lines[i].LeftSide = int16(binary.LittleEndian.Uint16(data[base+12:]))
+	}
+	return lines, nil
+}
+
+// Generieren der MapData aus den von LoadMapLumps geliferten Daten und Parsen per funcs
+func LoadMap(raw map[string][]byte) (*MapData, error) {
+	v, err := ParseVertices(raw["VERTEXES"])
+	if err != nil {
+		return nil, err
+	}
+	l, err := ParseLinedefs(raw["LINEDEFS"])
+	if err != nil {
+		return nil, err
+	}
+	return &MapData{Vertices: v, Linedefs: l}, nil
+}