First commit.

Author: Evsio0n

.gitignore

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+.idea

LICENSE

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+# Rockchip resource image (RSCE) Pack/Unpack Tool written in Go
+
+`Author:` [@evsio0n](https://evsio0n.com)
+
+----
+
+
+## Usage
+
+`-u`: Unpack the RSCE file to the specified directory.
+
+e.g. `./rsce_tool -u ./boot-second`
+
+`-p`: Pack the file to RSCE file.
+
+e.g. `./rsce_tool -p ./rk-kernel.dtb -p ./logo.bmp -p ./logo-kernel.bmp`
+

README.md

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+module main
+
+go 1.14
+
+replace rsce => ./rsce
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
+	github.com/evsio0n/log v0.0.0-20220309083450-856743806fca
+	github.com/urfave/cli v1.22.5
+	rsce v0.0.0-00010101000000-000000000000
+)

go.mod

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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/evsio0n/log v0.0.0-20220309083450-856743806fca h1:ramJKiYbGj8mCx18pcnE6Ye67Av9T3xTUca6d+CQRAU=
+github.com/evsio0n/log v0.0.0-20220309083450-856743806fca/go.mod h1:YcVGix+QIHnfRILtBRAedOfLzxKKNrO1wN6Lfyj3dvw=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/urfave/cli v1.22.5 h1:lNq9sAHXK2qfdI8W+GRItjCEkI+2oR4d+MEHy1CKXoU=
+github.com/urfave/cli v1.22.5/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

go.sum

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+/*
+ *
+ * @Author evsio0n
+ * @Date 2022/3/27 下午3:53
+ * @Email <[email protected]>
+ *
+ */
+
+package main
+
+import (
+	"github.com/evsio0n/log"
+	"github.com/urfave/cli"
+	"os"
+	"rsce"
+	"sort"
+)
+
+const (
+	name        = "rsce-go"
+	author      = "evsio0n <[email protected]>"
+	version     = "0.0.1"
+	description = "rsce-go is a tool for unpack or pack RSCE, aka rock chip resource image. \r\n" +
+		"\t using -u to unpack, using -p to pack.\r\n" +
+		"\t -u [filepath]  unpack rockchip rsce image\r\n" +
+		"\t -p [filepath] [filepath] [filepath]  pack all resource to rockchip rsce image\r\n"
+)
+
+func main() {
+	cmd := &cli.App{
+		Name:        name,
+		Author:      author,
+		Version:     version,
+		Description: description,
+		Flags: []cli.Flag{
+			cli.StringFlag{
+				Name:  "unpack,u",
+				Usage: "unpack rsce image",
+			},
+			cli.StringSliceFlag{
+				Name:  "pack,p",
+				Usage: "pack rsce image",
+			},
+		},
+		Action: Handle,
+	}
+	sort.Sort(cli.FlagsByName(cmd.Flags))
+	err := cmd.Run(os.Args)
+	if err != nil {
+		log.Error(err.Error())
+	}
+}
+func Handle(c *cli.Context) {
+
+	if c.String("unpack") != "" {
+		rsce.UnPackRSCE(c.String("unpack"))
+	}
+
+	if len(c.StringSlice("pack")) > 0 {
+		rsce.GenerateRSCE(c.StringSlice("pack"), "./boot-second")
+	}
+}

main.go

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+module RSCE
+
+go 1.14
+
+require github.com/evsio0n/log v0.0.0-20220309083450-856743806fca // indirect

rsce/go.mod

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+github.com/evsio0n/log v0.0.0-20220309083450-856743806fca h1:ramJKiYbGj8mCx18pcnE6Ye67Av9T3xTUca6d+CQRAU=
+github.com/evsio0n/log v0.0.0-20220309083450-856743806fca/go.mod h1:YcVGix+QIHnfRILtBRAedOfLzxKKNrO1wN6Lfyj3dvw=

rsce/go.sum

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+/*
+ *
+ * @Author evsio0n
+ * @Date 2022/3/27 下午3:53
+ * @Email <[email protected]>
+ *
+ */
+
+// Package rsce aka Rockchip resources image.
+//It's a binary file which contains device tree blob and additional resources
+//(like vendor splash screen) and appears as boot.img-second on unpacking.
+package rsce
+
+import (
+	"encoding/binary"
+)
+
+const (
+	HeaderMagic = "RSCE"
+	EntryMagic  = "ENTR"
+)
+
+type Header struct {
+	Magic             [4]byte //"RSCE"
+	RSCEver           uint16  //0x0000
+	RSCEfileTblVer    uint16  //0x0000
+	HdrBlkSize        byte    //0x01
+	FileTblBlkOffset  byte    //0x01
+	FileTblRecBlkSize byte    //0x01
+	Unknown           byte    //0x00
+	FileCount         uint32
+	//.... All along calculated as 512 bytes.
+	//and all in little endian.
+	//Reserved [496]byte
+}
+
+type FileEntry struct {
+	Magic         [4]byte //"ENTR"
+	FileName      [256]byte
+	FileBlkOffset uint32
+	FileSize      uint32
+
+	//.... All along calculated as 512 bytes.
+	//Reserved      [244]byte
+}
+type fileEntry struct {
+	FileName      string
+	FileBlkOffset uint32
+	FileSize      uint32
+}
+
+func removeZeroByte(src []byte) []byte {
+	var strBuf []byte
+	for _, v := range src {
+		if v != 0 {
+			strBuf = append(strBuf, v)
+		}
+	}
+	return strBuf
+}
+
+func (h *Header) ToBytes() [512]byte {
+	var headerBuffer [512]byte
+	//copy header to buffer
+	//string to byte
+	HeaderMagicByte := make([]byte, 4)
+	HeaderMagicByte = []byte(HeaderMagic)
+
+	copy(headerBuffer[:4], HeaderMagicByte)
+	copy(headerBuffer[4:6], toLittleEndianBytes(uint(h.RSCEver), 2, 16))
+	copy(headerBuffer[6:8], toLittleEndianBytes(uint(h.RSCEfileTblVer), 2, 16))
+	copy(headerBuffer[8:9], []byte{h.HdrBlkSize})
+	copy(headerBuffer[9:10], []byte{h.FileTblBlkOffset})
+	copy(headerBuffer[10:11], []byte{h.FileTblRecBlkSize})
+	copy(headerBuffer[11:12], []byte{h.Unknown})
+	copy(headerBuffer[12:16], toLittleEndianBytes(uint(h.FileCount), 4, 16))
+	return headerBuffer
+}
+
+func (f *fileEntry) ToBytes() [512]byte {
+	var fileEntryBuffer [512]byte
+	//copy file entry to buffer
+	//string to byte
+	EntryMagicByte := make([]byte, 4)
+	EntryMagicByte = []byte(EntryMagic)
+	//string extend to 256 bytes
+	fileName := f.FileName
+	//null safe if file name is more than 256 bytes
+	if len(fileName) > 256 {
+		fileName = fileName[:256]
+	}
+	var fileNameBuffer [256]byte
+	copy(fileNameBuffer[:len(fileName)], fileName)
+	copy(fileEntryBuffer[:4], EntryMagicByte)
+	copy(fileEntryBuffer[4:260], fileNameBuffer[:])
+	copy(fileEntryBuffer[260:264], toLittleEndianBytes(uint(f.FileBlkOffset), 4, 32))
+	copy(fileEntryBuffer[264:268], toLittleEndianBytes(uint(f.FileSize), 4, 32))
+	return fileEntryBuffer
+}
+
+func toLittleEndianBytes(num uint, byteLength int, uintByte int) []byte {
+	littleEndianBytes := make([]byte, byteLength)
+	//check uint type
+	switch uintByte {
+	case 16:
+		binary.LittleEndian.PutUint16(littleEndianBytes[:], uint16(num))
+	case 32:
+		binary.LittleEndian.PutUint32(littleEndianBytes[:], uint32(num))
+		//default. wes should not be here
+	default:
+		binary.LittleEndian.PutUint16(littleEndianBytes[:], uint16(num))
+	}
+	return littleEndianBytes
+}