claude: fold in old sow-tools

2026-06-13 09:49:29 +02:00
parent d4a435883b
commit 56c67132f3
112 changed files with 70812 additions and 74 deletions
@@ -0,0 +1,424 @@
+package erf
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"strings"
+)
+
+const (
+	headerSize = 160
+	versionV10 = "V1.0"
+	strRefNone = 0xFFFFFFFF
+	typeMOD    = "MOD "
+	typeHAK    = "HAK "
+)
+
+type Archive struct {
+	FileType  string
+	Version   string
+	Resources []Resource
+}
+
+type Resource struct {
+	Name       string
+	Type       uint16
+	Data       []byte
+	SourcePath string
+	Size       int64
+}
+
+type header struct {
+	FileType              [4]byte
+	Version               [4]byte
+	LanguageCount         uint32
+	LocalizedStringSize   uint32
+	EntryCount            uint32
+	LocalizedStringOffset uint32
+	KeyListOffset         uint32
+	ResourceListOffset    uint32
+	BuildYear             uint32
+	BuildDay              uint32
+	DescriptionStrRef     uint32
+	Reserved              [116]byte
+}
+
+type keyEntry struct {
+	ResRef       [16]byte
+	ResourceID   uint32
+	ResourceType uint16
+	Unused       uint16
+}
+
+type resourceEntry struct {
+	Offset uint32
+	Size   uint32
+}
+
+var extensionTypes = map[string]uint16{
+	"res": 0x0000,
+	"bmp": 0x0001,
+	"mve": 0x0002,
+	"tga": 0x0003,
+	"wav": 0x0004,
+	"plt": 0x0006,
+	"ini": 0x0007,
+	"bmu": 0x0008,
+	"txt": 0x000A,
+	"mdl": 0x07D2,
+	"nss": 0x07D9,
+	"ncs": 0x07DA,
+	"are": 0x07DC,
+	"set": 0x07DD,
+	"ifo": 0x07DE,
+	"bic": 0x07DF,
+	"wok": 0x07E0,
+	"2da": 0x07E1,
+	"tlk": 0x07E2,
+	"txi": 0x07E6,
+	"git": 0x07E7,
+	"uti": 0x07E9,
+	"utc": 0x07EB,
+	"dlg": 0x07ED,
+	"itp": 0x07EE,
+	"utt": 0x07F0,
+	"dds": 0x07F1,
+	"uts": 0x07F3,
+	"fac": 0x07F6,
+	"gff": 0x07F7,
+	"ute": 0x07F8,
+	"utd": 0x07FA,
+	"utp": 0x07FC,
+	"dfa": 0x07FD,
+	"gic": 0x07FE,
+	"gui": 0x07FF,
+	"utm": 0x0803,
+	"dwk": 0x0804,
+	"pwk": 0x0805,
+	"utg": 0x0807,
+	"jrl": 0x0808,
+	"utw": 0x080A,
+	"ssf": 0x080C,
+	"hak": 0x080D,
+	"nwm": 0x080E,
+	"bik": 0x080F,
+	"ndb": 0x0810,
+	"ptm": 0x0811,
+	"ptt": 0x0812,
+	"ltr": 0x0813,
+	"shd": 0x0815,
+	"mdb": 0x0816,
+	"mtr": 0x0818,
+	"jpg": 0x081C,
+	"lod": 0x081E,
+	"png": 0x0820,
+	"lyt": 0x0BB8,
+	"vis": 0x0BB9,
+	"mdx": 0x0BC0,
+	"wlk": 0x0BCC,
+	"xml": 0x0BCD,
+	"gr2": 0x0FA3,
+}
+
+var typeExtensions = map[uint16]string{
+	0x0000: "res",
+	0x0001: "bmp",
+	0x0002: "mve",
+	0x0003: "tga",
+	0x0004: "wav",
+	0x0006: "plt",
+	0x0007: "ini",
+	0x0008: "bmu",
+	0x000A: "txt",
+	0x07D2: "mdl",
+	0x07D9: "nss",
+	0x07DA: "ncs",
+	0x07DC: "are",
+	0x07DD: "set",
+	0x07DE: "ifo",
+	0x07DF: "bic",
+	0x07E0: "wok",
+	0x07E1: "2da",
+	0x07E2: "tlk",
+	0x07E6: "txi",
+	0x07E7: "git",
+	0x07E9: "uti",
+	0x07EB: "utc",
+	0x07ED: "dlg",
+	0x07EE: "itp",
+	0x07F0: "utt",
+	0x07F1: "dds",
+	0x07F3: "uts",
+	0x07F6: "fac",
+	0x07F7: "gff",
+	0x07F8: "ute",
+	0x07FA: "utd",
+	0x07FC: "utp",
+	0x07FD: "dfa",
+	0x07FE: "gic",
+	0x07FF: "gui",
+	0x0803: "utm",
+	0x0804: "dwk",
+	0x0805: "pwk",
+	0x0807: "utg",
+	0x0808: "jrl",
+	0x080A: "utw",
+	0x080C: "ssf",
+	0x080D: "hak",
+	0x080E: "nwm",
+	0x080F: "bik",
+	0x0810: "ndb",
+	0x0811: "ptm",
+	0x0812: "ptt",
+	0x0813: "ltr",
+	0x0815: "shd",
+	0x0816: "mdb",
+	0x0818: "mtr",
+	0x081C: "jpg",
+	0x081E: "lod",
+	0x0820: "png",
+	0x0BB8: "lyt",
+	0x0BB9: "vis",
+	0x0BC0: "mdx",
+	0x0BCC: "wlk",
+	0x0BCD: "xml",
+	0x0FA3: "gr2",
+}
+
+func init() {
+	for ext, resourceType := range extensionTypes {
+		canonicalExt, ok := typeExtensions[resourceType]
+		if !ok {
+			panic(fmt.Sprintf("missing canonical extension for resource type 0x%04X", resourceType))
+		}
+		if canonicalExt == ext {
+			continue
+		}
+	}
+}
+
+func New(fileType string, resources []Resource) Archive {
+	normalized := make([]Resource, len(resources))
+	copy(normalized, resources)
+	sort.Slice(normalized, func(i, j int) bool {
+		if normalized[i].Name == normalized[j].Name {
+			return normalized[i].Type < normalized[j].Type
+		}
+		return normalized[i].Name < normalized[j].Name
+	})
+
+	return Archive{
+		FileType:  padFour(fileType),
+		Version:   versionV10,
+		Resources: normalized,
+	}
+}
+
+func ArchiveSize(resources []Resource) int64 {
+	return int64(headerSize+len(resources)*24+len(resources)*8) + totalResourceBytes(resources)
+}
+
+func Write(w io.Writer, archive Archive) error {
+	if archive.Version == "" {
+		archive.Version = versionV10
+	}
+	if archive.FileType == "" {
+		archive.FileType = typeMOD
+	}
+
+	keys := make([]keyEntry, 0, len(archive.Resources))
+	entries := make([]resourceEntry, 0, len(archive.Resources))
+
+	dataOffset := uint32(headerSize + len(archive.Resources)*24 + len(archive.Resources)*8)
+	for index, resource := range archive.Resources {
+		if len(resource.Name) > 16 {
+			return fmt.Errorf("resource %q exceeds 16-byte resref limit", resource.Name)
+		}
+		size, err := payloadSize(resource)
+		if err != nil {
+			return err
+		}
+		if size > int64(^uint32(0)) {
+			return fmt.Errorf("resource %q exceeds 4 GiB resource size limit", resource.Name)
+		}
+
+		entry := resourceEntry{
+			Offset: dataOffset,
+			Size:   uint32(size),
+		}
+		entries = append(entries, entry)
+		dataOffset += uint32(size)
+
+		var key keyEntry
+		copy(key.ResRef[:], []byte(resource.Name))
+		key.ResourceID = uint32(index)
+		key.ResourceType = resource.Type
+		keys = append(keys, key)
+	}
+
+	hdr := header{
+		LanguageCount:         0,
+		LocalizedStringSize:   0,
+		EntryCount:            uint32(len(archive.Resources)),
+		LocalizedStringOffset: headerSize,
+		KeyListOffset:         headerSize,
+		ResourceListOffset:    uint32(headerSize + len(keys)*24),
+		BuildYear:             0,
+		BuildDay:              0,
+		DescriptionStrRef:     strRefNone,
+	}
+	copy(hdr.FileType[:], []byte(padFour(archive.FileType)))
+	copy(hdr.Version[:], []byte(padFour(archive.Version)))
+
+	if err := binary.Write(w, binary.LittleEndian, hdr); err != nil {
+		return err
+	}
+	if err := binary.Write(w, binary.LittleEndian, keys); err != nil {
+		return err
+	}
+	if err := binary.Write(w, binary.LittleEndian, entries); err != nil {
+		return err
+	}
+	for _, resource := range archive.Resources {
+		if err := writeResourceData(w, resource); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func Read(r io.Reader) (Archive, error) {
+	data, err := io.ReadAll(r)
+	if err != nil {
+		return Archive{}, fmt.Errorf("read erf: %w", err)
+	}
+	if len(data) < headerSize {
+		return Archive{}, fmt.Errorf("erf file too small: %d bytes", len(data))
+	}
+
+	var hdr header
+	if err := binary.Read(bytes.NewReader(data[:headerSize]), binary.LittleEndian, &hdr); err != nil {
+		return Archive{}, fmt.Errorf("decode erf header: %w", err)
+	}
+
+	keyStart := int(hdr.KeyListOffset)
+	keyEnd := keyStart + int(hdr.EntryCount)*24
+	if keyEnd > len(data) {
+		return Archive{}, fmt.Errorf("erf key list exceeds file bounds")
+	}
+	keys := make([]keyEntry, hdr.EntryCount)
+	if err := binary.Read(bytes.NewReader(data[keyStart:keyEnd]), binary.LittleEndian, &keys); err != nil {
+		return Archive{}, fmt.Errorf("decode key list: %w", err)
+	}
+
+	resourceStart := int(hdr.ResourceListOffset)
+	resourceEnd := resourceStart + int(hdr.EntryCount)*8
+	if resourceEnd > len(data) {
+		return Archive{}, fmt.Errorf("erf resource list exceeds file bounds")
+	}
+	entries := make([]resourceEntry, hdr.EntryCount)
+	if err := binary.Read(bytes.NewReader(data[resourceStart:resourceEnd]), binary.LittleEndian, &entries); err != nil {
+		return Archive{}, fmt.Errorf("decode resource list: %w", err)
+	}
+
+	resources := make([]Resource, 0, hdr.EntryCount)
+	for index, key := range keys {
+		entry := entries[index]
+		start := int(entry.Offset)
+		end := start + int(entry.Size)
+		if end > len(data) {
+			return Archive{}, fmt.Errorf("resource %d exceeds file bounds", index)
+		}
+
+		resref := string(bytes.TrimRight(key.ResRef[:], "\x00"))
+		payload := make([]byte, entry.Size)
+		copy(payload, data[start:end])
+		resources = append(resources, Resource{
+			Name: resref,
+			Type: key.ResourceType,
+			Data: payload,
+			Size: int64(entry.Size),
+		})
+	}
+
+	return Archive{
+		FileType:  string(hdr.FileType[:]),
+		Version:   string(hdr.Version[:]),
+		Resources: resources,
+	}, nil
+}
+
+func ResourceTypeForExtension(extension string) (uint16, bool) {
+	resourceType, ok := extensionTypes[strings.TrimPrefix(strings.ToLower(extension), ".")]
+	return resourceType, ok
+}
+
+func HAKResourceTypeForExtension(extension string) (uint16, bool) {
+	return ResourceTypeForExtension(extension)
+}
+
+func ExtensionForResourceType(resourceType uint16) (string, bool) {
+	extension, ok := typeExtensions[resourceType]
+	return extension, ok
+}
+
+func padFour(value string) string {
+	value = strings.ToUpper(value)
+	if len(value) >= 4 {
+		return value[:4]
+	}
+	return value + strings.Repeat(" ", 4-len(value))
+}
+
+func totalResourceBytes(resources []Resource) int64 {
+	var total int64
+	for _, resource := range resources {
+		switch {
+		case resource.Size > 0:
+			total += resource.Size
+		default:
+			total += int64(len(resource.Data))
+		}
+	}
+	return total
+}
+
+func payloadSize(resource Resource) (int64, error) {
+	if resource.Size > 0 {
+		return resource.Size, nil
+	}
+	if resource.SourcePath != "" && len(resource.Data) == 0 {
+		info, err := os.Stat(resource.SourcePath)
+		if err != nil {
+			return 0, fmt.Errorf("stat resource %q: %w", resource.SourcePath, err)
+		}
+		return info.Size(), nil
+	}
+	return int64(len(resource.Data)), nil
+}
+
+func writeResourceData(w io.Writer, resource Resource) error {
+	if len(resource.Data) > 0 || resource.SourcePath == "" {
+		_, err := w.Write(resource.Data)
+		return err
+	}
+
+	file, err := os.Open(resource.SourcePath)
+	if err != nil {
+		return fmt.Errorf("open resource %q: %w", resource.SourcePath, err)
+	}
+	defer file.Close()
+
+	written, err := io.Copy(w, file)
+	if err != nil {
+		return fmt.Errorf("copy resource %q: %w", resource.SourcePath, err)
+	}
+	if resource.Size > 0 && written != resource.Size {
+		return fmt.Errorf("copy resource %q: expected %d bytes, wrote %d", resource.SourcePath, resource.Size, written)
+	}
+	return nil
+}