forked from gen2brain/raylib-go
/
rres.go
691 lines (578 loc) · 13.1 KB
/
rres.go
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package rres
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/rand"
"encoding/binary"
"fmt"
"io"
"io/ioutil"
"os"
"unsafe"
"github.com/dsnet/compress/bzip2"
"github.com/golang/snappy"
"github.com/klauspost/compress/flate"
"github.com/pierrec/lz4"
xor "github.com/rootlch/encrypt"
"github.com/ulikunitz/xz"
"golang.org/x/crypto/blowfish"
"golang.org/x/crypto/xtea"
"github.com/gen2brain/raylib-go/raylib"
)
type Data struct {
// Resource type (4 byte)
Type uint32
// Resource parameter 1 (4 byte)
Param1 uint32
// Resource parameter 2 (4 byte)
Param2 uint32
// Resource parameter 3 (4 byte)
Param3 uint32
// Resource parameter 4 (4 byte)
Param4 uint32
// Resource data
Data []byte
}
// FileHeader - rRES file header (8 byte)
type FileHeader struct {
// File identifier: rRES (4 byte)
ID [4]byte
// File version and subversion (2 byte)
Version uint16
// Number of resources in this file (2 byte)
Count uint16
}
// InfoHeader - rRES info header, every resource includes this header (16 byte + 16 byte)
type InfoHeader struct {
// Resource unique identifier (4 byte)
ID uint32
// Resource data type (1 byte)
DataType uint8
// Resource data compression type (1 byte)
CompType uint8
// Resource data encryption type (1 byte)
CryptoType uint8
// Resource data parts count, used for splitted data (1 byte)
PartsCount uint8
// Resource data size (compressed or not, only DATA) (4 byte)
DataSize uint32
// Resource data size (uncompressed, only DATA) (4 byte)
UncompSize uint32
// Resource parameter 1 (4 byte)
Param1 uint32
// Resource parameter 2 (4 byte)
Param2 uint32
// Resource parameter 3 (4 byte)
Param3 uint32
// Resource parameter 4 (4 byte)
Param4 uint32
}
// rRES data types
const (
TypeRaw = iota
TypeImage
TypeWave
TypeVertex
TypeText
TypeFontImage
TypeFontCharData
TypeDirectory
TypeVorbis
)
// Compression types
const (
// No data compression
CompNone = iota
// DEFLATE compression
CompDeflate
// LZ4 compression
CompLZ4
// LZMA compression
CompLZMA
// BROTLI compression
CompBrotli
// LZMA2 (XZ) compression
CompLZMA2
// BZIP2 compression
CompBZIP2
// Snappy compression
CompSnappy
)
// Encryption types
const (
// No data encryption
CryptoNone = iota
// XOR (128 bit) encryption
CryptoXOR
// RIJNDAEL (128 bit) encryption (AES)
CryptoAES
// Triple DES encryption
Crypto3DES
// Blowfish encryption
CryptoBlowfish
// Extended TEA encryption
CryptoXTEA
)
// Image formats
const (
// 8 bit per pixel (no alpha)
ImUncompGrayscale = iota + 1
// 16 bpp (2 channels)
ImUncompGrayAlpha
// 16 bpp
ImUncompR5g6b5
// 24 bpp
ImUncompR8g8b8
// 16 bpp (1 bit alpha)
ImUncompR5g5b5a1
// 16 bpp (4 bit alpha)
ImUncompR4g4b4a4
// 32 bpp
ImUncompR8g8b8a8
// 4 bpp (no alpha)
ImCompDxt1Rgb
// 4 bpp (1 bit alpha)
ImCompDxt1Rgba
// 8 bpp
ImCompDxt3Rgba
// 8 bpp
ImCompDxt5Rgba
// 4 bpp
ImCompEtc1Rgb
// 4 bpp
ImCompEtc2Rgb
// 8 bpp
ImCompEtc2EacRgba
// 4 bpp
ImCompPvrtRgb
// 4 bpp
ImCompPvrtRgba
// 8 bpp
ImCompAstc4x4Rgba
// 2 bpp
ImCompAstc8x8Rgba
)
// Vert
const (
VertPosition = iota
VertTexcoord1
VertTexcoord2
VertTexcoord3
VertTexcoord4
VertNormal
VertTangent
VertColor
VertIndex
)
// Vert
const (
VertByte = iota
VertShort
VertInt
VertHfloat
VertFloat
)
// LoadResource - Load resource from file by id
// NOTE: Returns uncompressed data with parameters, search resource by id
func LoadResource(reader io.ReadSeeker, rresID int, key []byte) (data Data) {
var fileHeader FileHeader
var infoHeader InfoHeader
reader.Seek(0, 0)
// Read rres file header
err := binary.Read(reader, binary.LittleEndian, &fileHeader)
if err != nil {
rl.TraceLog(rl.LogWarning, err.Error())
return
}
// Verify "rRES" identifier
if string(fileHeader.ID[:]) != "rRES" {
rl.TraceLog(rl.LogWarning, "not a valid raylib resource file")
return
}
reader.Seek(int64(unsafe.Sizeof(fileHeader)), os.SEEK_CUR)
for i := 0; i < int(fileHeader.Count); i++ {
// Read resource info and parameters
err = binary.Read(reader, binary.LittleEndian, &infoHeader)
if err != nil {
rl.TraceLog(rl.LogWarning, err.Error())
return
}
reader.Seek(int64(unsafe.Sizeof(infoHeader)), os.SEEK_CUR)
if int(infoHeader.ID) == rresID {
data.Type = uint32(infoHeader.DataType)
data.Param1 = infoHeader.Param1
data.Param2 = infoHeader.Param2
data.Param3 = infoHeader.Param3
data.Param4 = infoHeader.Param4
// Read resource data block
b := make([]byte, infoHeader.DataSize)
reader.Read(b)
// Decompress data
data.Data, err = Decompress(b, int(infoHeader.CompType))
if err != nil {
rl.TraceLog(rl.LogWarning, "[ID %d] %v", infoHeader.ID, err)
}
// Decrypt data
data.Data, err = Decrypt(key, data.Data, int(infoHeader.CryptoType))
if err != nil {
rl.TraceLog(rl.LogWarning, "[ID %d] %v", infoHeader.ID, err)
}
if data.Data != nil && len(data.Data) == int(infoHeader.UncompSize) {
rl.TraceLog(rl.LogInfo, "[ID %d] Resource data loaded successfully", infoHeader.ID)
}
} else {
// Skip required data to read next resource infoHeader
reader.Seek(int64(infoHeader.DataSize), os.SEEK_CUR)
}
}
if data.Data == nil {
rl.TraceLog(rl.LogWarning, "[ID %d] Requested resource could not be found", rresID)
}
return
}
// Encrypt data
func Encrypt(key, data []byte, cryptoType int) ([]byte, error) {
switch cryptoType {
case CryptoXOR:
c, err := xor.NewXor(string(key))
if err != nil {
return nil, err
}
return c.Encode(data), nil
case CryptoAES:
b, err := encryptAES(key, data)
if err != nil {
return nil, err
}
return b, nil
case Crypto3DES:
b, err := encrypt3DES(key, data)
if err != nil {
return nil, err
}
return b, nil
case CryptoBlowfish:
b, err := encryptBlowfish(key, data)
if err != nil {
return nil, err
}
return b, nil
case CryptoXTEA:
b, err := encryptXTEA(key, data)
if err != nil {
fmt.Printf("%v\n", err)
}
return b, nil
default:
return data, nil
}
}
// Decrypt data
func Decrypt(key, data []byte, cryptoType int) ([]byte, error) {
switch cryptoType {
case CryptoXOR:
c, err := xor.NewXor(string(key))
if err != nil {
return nil, err
}
b := c.Encode(data)
return b, nil
case CryptoAES:
b, err := decryptAES(key, data)
if err != nil {
return nil, err
}
return b, nil
case Crypto3DES:
b, err := decrypt3DES(key, data)
if err != nil {
return nil, err
}
return b, nil
case CryptoBlowfish:
b, err := decryptBlowfish(key, data)
if err != nil {
return nil, err
}
return b, nil
case CryptoXTEA:
b, err := decryptXTEA(key, data)
if err != nil {
return nil, err
}
return b, nil
default:
return data, nil
}
}
// Compress data
func Compress(data []byte, compType int) ([]byte, error) {
switch compType {
case CompNone:
return data, nil
case CompDeflate:
buf := new(bytes.Buffer)
w, err := flate.NewWriter(buf, flate.DefaultCompression)
if err != nil {
return nil, err
}
_, err = w.Write(data)
if err != nil {
return nil, err
}
w.Close()
return buf.Bytes(), nil
case CompLZ4:
buf := new(bytes.Buffer)
w := lz4.NewWriter(buf)
_, err := w.Write(data)
if err != nil {
return nil, err
}
w.Close()
return buf.Bytes(), nil
case CompLZMA2:
buf := new(bytes.Buffer)
w, err := xz.NewWriter(buf)
if err != nil {
return nil, err
}
_, err = w.Write(data)
if err != nil {
return nil, err
}
w.Close()
return buf.Bytes(), nil
case CompBZIP2:
buf := new(bytes.Buffer)
w, err := bzip2.NewWriter(buf, &bzip2.WriterConfig{Level: bzip2.BestCompression})
if err != nil {
return nil, err
}
_, err = w.Write(data)
if err != nil {
return nil, err
}
w.Close()
return buf.Bytes(), nil
case CompSnappy:
buf := new(bytes.Buffer)
w := snappy.NewWriter(buf)
_, err := w.Write(data)
if err != nil {
return nil, err
}
w.Close()
return buf.Bytes(), nil
default:
return data, nil
}
}
// Decompress data
func Decompress(data []byte, compType int) ([]byte, error) {
switch compType {
case CompNone:
return data, nil
case CompDeflate:
r := flate.NewReader(bytes.NewReader(data))
u, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
r.Close()
return u, nil
case CompLZ4:
r := lz4.NewReader(bytes.NewReader(data))
u, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return u, nil
case CompLZMA2:
r, err := xz.NewReader(bytes.NewReader(data))
if err != nil {
return nil, err
}
u, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return u, nil
case CompBZIP2:
r, err := bzip2.NewReader(bytes.NewReader(data), &bzip2.ReaderConfig{})
if err != nil {
return nil, err
}
u, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return u, nil
case CompSnappy:
r := snappy.NewReader(bytes.NewReader(data))
u, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return u, nil
default:
return data, nil
}
}
// pad to block size
func pad(src []byte, blockSize int) []byte {
padding := blockSize - len(src)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(src, padtext...)
}
// unpad
func unpad(src []byte) ([]byte, error) {
length := len(src)
unpadding := int(src[length-1])
if unpadding > length {
return nil, fmt.Errorf("unpad error. This can happen when incorrect encryption key is used.")
}
return src[:(length - unpadding)], nil
}
// encryptAES
func encryptAES(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
msg := pad(text, aes.BlockSize)
ciphertext := make([]byte, aes.BlockSize+len(msg))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext[aes.BlockSize:], msg)
return ciphertext, nil
}
// decryptAES
func decryptAES(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
if (len(text) % aes.BlockSize) != 0 {
return nil, fmt.Errorf("blocksize must be multiple of decoded message length")
}
iv := text[:aes.BlockSize]
msg := text[aes.BlockSize:]
cfb := cipher.NewCFBDecrypter(block, iv)
cfb.XORKeyStream(msg, msg)
unpadMsg, err := unpad(msg)
if err != nil {
return nil, err
}
return unpadMsg, nil
}
// encrypt3DES
func encrypt3DES(key, text []byte) ([]byte, error) {
block, err := des.NewTripleDESCipher(key)
if err != nil {
return nil, err
}
msg := pad(text, des.BlockSize)
ciphertext := make([]byte, des.BlockSize+len(msg))
iv := ciphertext[:des.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cbc := cipher.NewCBCEncrypter(block, iv)
cbc.CryptBlocks(ciphertext[des.BlockSize:], msg)
return ciphertext, nil
}
// decrypt3DES
func decrypt3DES(key, text []byte) ([]byte, error) {
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
if (len(text) % des.BlockSize) != 0 {
return nil, fmt.Errorf("blocksize must be multiple of decoded message length")
}
iv := text[:des.BlockSize]
msg := text[des.BlockSize:]
cbc := cipher.NewCBCDecrypter(block, iv)
cbc.CryptBlocks(msg, msg)
unpadMsg, err := unpad(msg)
if err != nil {
return nil, err
}
return unpadMsg, nil
}
// encryptBlowfish
func encryptBlowfish(key, text []byte) ([]byte, error) {
block, err := blowfish.NewCipher(key)
if err != nil {
return nil, err
}
msg := pad(text, blowfish.BlockSize)
ciphertext := make([]byte, blowfish.BlockSize+len(msg))
iv := ciphertext[:blowfish.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cbc := cipher.NewCBCEncrypter(block, iv)
cbc.CryptBlocks(ciphertext[blowfish.BlockSize:], msg)
return ciphertext, nil
}
// decryptBlowfish
func decryptBlowfish(key, text []byte) ([]byte, error) {
block, err := blowfish.NewCipher(key)
if err != nil {
return nil, err
}
if (len(text) % blowfish.BlockSize) != 0 {
return nil, fmt.Errorf("blocksize must be multiple of decoded message length")
}
iv := text[:blowfish.BlockSize]
msg := text[blowfish.BlockSize:]
cbc := cipher.NewCBCDecrypter(block, iv)
cbc.CryptBlocks(msg, msg)
unpadMsg, err := unpad(msg)
if err != nil {
return nil, err
}
return unpadMsg, nil
}
// encryptXTEA
func encryptXTEA(key, text []byte) ([]byte, error) {
block, err := xtea.NewCipher(key)
if err != nil {
return nil, err
}
msg := pad(text, xtea.BlockSize)
ciphertext := make([]byte, xtea.BlockSize+len(msg))
iv := ciphertext[:xtea.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cbc := cipher.NewCBCEncrypter(block, iv)
cbc.CryptBlocks(ciphertext[xtea.BlockSize:], msg)
return ciphertext, nil
}
// decryptXTEA
func decryptXTEA(key, text []byte) ([]byte, error) {
block, err := xtea.NewCipher(key)
if err != nil {
return nil, err
}
if (len(text) % xtea.BlockSize) != 0 {
return nil, fmt.Errorf("blocksize must be multiple of decoded message length")
}
iv := text[:xtea.BlockSize]
msg := text[xtea.BlockSize:]
cbc := cipher.NewCBCDecrypter(block, iv)
cbc.CryptBlocks(msg, msg)
unpadMsg, err := unpad(msg)
if err != nil {
return nil, err
}
return unpadMsg, nil
}