/// <summary>
/// Update encryption keys
/// </summary>
protected void UpdateKeys(byte ch)
{
keys[0] = Crc32Checksum.ComputeCrc32(keys[0], ch);
keys[1] = keys[1] + (byte)keys[0];
keys[1] = keys[1] * 134775813 + 1;
keys[2] = Crc32Checksum.ComputeCrc32(keys[2], (byte)(keys[1] >> 24));
}
/// <summary>
/// Calculates the CRC checksum of the file.
/// </summary>
public static uint CalculateCrc(this FileInfo file)
{
using (var stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None))
{
return(Crc32Checksum.Generate(stream));
}
}
/// <summary>
/// Closes the zip input stream
/// </summary>
public override void Close()
{
internalReader = ReadingNotAvailable;
crc = null;
entry = null;
base.Close();
}
public void Crc32Checksum_6()
{
if (ZLibInit.ZLibProvided)
{
byte[] sample = Encoding.UTF8.GetBytes("ABCDEF");
uint checksum = Crc32Checksum.Crc32(sample, 1, 3);
Assert.IsTrue(checksum == 0x26BA19F3); // BCD
}
}
public void Crc32Checksum_5()
{
if (ZLibInit.ZLibProvided)
{
uint checksum = Crc32Checksum.Crc32(Encoding.UTF8.GetBytes("ABC"));
Assert.IsTrue(checksum == 0xA3830348); // ABC
checksum = Crc32Checksum.Crc32(checksum, Encoding.UTF8.GetBytes("DEF"));
Assert.IsTrue(checksum == 0xBB76FE69); // ABCDEF
}
}
public void Crc32Checksum_4()
{
if (ZLibInit.ZLibProvided)
{
Crc32Checksum crc = new Crc32Checksum();
crc.Append(Encoding.UTF8.GetBytes("ABC"));
Assert.IsTrue(crc.Checksum == 0xA3830348); // ABC
crc.Append(Encoding.UTF8.GetBytes("DEF"));
Assert.IsTrue(crc.Checksum == 0xBB76FE69); // ABCDEF
}
}
public void Crc32Checksum_7()
{
if (ZLibInit.ZLibProvided)
{
string filePath = Path.Combine(TestSetup.SampleDir, "ex3.jpg");
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
uint checksum = Crc32Checksum.Crc32(fs);
Assert.IsTrue(checksum == 0x63D4D64B);
}
}
}
public void Crc32Checksum_8()
{
if (ZLibInit.ZLibProvided)
{
byte[] sample1 = Encoding.UTF8.GetBytes("ABC");
byte[] sample2 = Encoding.UTF8.GetBytes("DEF");
using (MemoryStream ms1 = new MemoryStream(sample1))
using (MemoryStream ms2 = new MemoryStream(sample2))
{
uint checksum = Crc32Checksum.Crc32(ms1);
Assert.IsTrue(checksum == 0xA3830348); // ABC
checksum = Crc32Checksum.Crc32(checksum, ms2);
Assert.IsTrue(checksum == 0xBB76FE69); // ABCDEF
}
}
}
/// <summary>
/// Generates new encryption keys based on given seed
/// </summary>
/// <param name="seed">The seed value to initialise keys with.</param>
/// <returns>A new key value.</returns>
static public byte[] GenerateKeys(byte[] seed)
{
if (seed == null)
{
throw new ArgumentNullException("seed");
}
if (seed.Length == 0)
{
throw new ArgumentException("Length is zero", "seed");
}
uint[] newKeys = new uint[] {
0x12345678,
0x23456789,
0x34567890
};
foreach (byte t in seed)
{
newKeys[0] = Crc32Checksum.ComputeCrc32(newKeys[0], t);
newKeys[1] = newKeys[1] + (byte)newKeys[0];
newKeys[1] = newKeys[1] * 134775813 + 1;
newKeys[2] = Crc32Checksum.ComputeCrc32(newKeys[2], (byte)(newKeys[1] >> 24));
}
byte[] result = new byte[12];
result[0] = (byte)(newKeys[0] & 0xff);
result[1] = (byte)((newKeys[0] >> 8) & 0xff);
result[2] = (byte)((newKeys[0] >> 16) & 0xff);
result[3] = (byte)((newKeys[0] >> 24) & 0xff);
result[4] = (byte)(newKeys[1] & 0xff);
result[5] = (byte)((newKeys[1] >> 8) & 0xff);
result[6] = (byte)((newKeys[1] >> 16) & 0xff);
result[7] = (byte)((newKeys[1] >> 24) & 0xff);
result[8] = (byte)(newKeys[2] & 0xff);
result[9] = (byte)((newKeys[2] >> 8) & 0xff);
result[10] = (byte)((newKeys[2] >> 16) & 0xff);
result[11] = (byte)((newKeys[2] >> 24) & 0xff);
return(result);
}
public void Crc32Checksum_1()
{
void Template(string path, uint checksum)
{
string filePath = Path.Combine(TestSetup.SampleDir, path);
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
Crc32Checksum crc = new Crc32Checksum();
crc.Append(fs);
Assert.IsTrue(crc.Checksum == checksum);
}
}
if (!ZLibInit.ZLibProvided)
{
return;
}
Template("ex1.jpg", 0x1961D0C6);
Template("ex2.jpg", 0x7641A243);
Template("ex3.jpg", 0x63D4D64B);
}
void ReadHeader()
{
// 1. Check the two magic bytes
Crc32Checksum headCRC = new Crc32Checksum();
int magic = baseInputStream.ReadByte();
if (magic < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(magic);
if (magic != (GZipConstants.GzipMagic >> 8))
{
throw new GZipException("Error GZIP header, first magic byte doesn't match");
}
magic = baseInputStream.ReadByte();
if (magic < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (magic != (GZipConstants.GzipMagic & 0xFF))
{
throw new GZipException("Error GZIP header, second magic byte doesn't match");
}
headCRC.Update(magic);
// 2. Check the compression type (must be 8)
int compressionType = baseInputStream.ReadByte();
if (compressionType < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (compressionType != 8)
{
throw new GZipException("Error GZIP header, data not in deflate format");
}
headCRC.Update(compressionType);
// 3. Check the flags
int flags = baseInputStream.ReadByte();
if (flags < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(flags);
/* This flag byte is divided into individual bits as follows:
*
* bit 0 FTEXT
* bit 1 FHCRC
* bit 2 FEXTRA
* bit 3 FNAME
* bit 4 FCOMMENT
* bit 5 reserved
* bit 6 reserved
* bit 7 reserved
*/
// 3.1 Check the reserved bits are zero
if ((flags & 0xE0) != 0)
{
throw new GZipException("Reserved flag bits in GZIP header != 0");
}
// 4.-6. Skip the modification time, extra flags, and OS type
for (int i = 0; i < 6; i++)
{
int readByte = baseInputStream.ReadByte();
if (readByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(readByte);
}
// 7. Read extra field
if ((flags & GZipConstants.FEXTRA) != 0)
{
// Skip subfield id
for (int i = 0; i < 2; i++)
{
int readByte = baseInputStream.ReadByte();
if (readByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(readByte);
}
if (baseInputStream.ReadByte() < 0 || baseInputStream.ReadByte() < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
int len1, len2;
len1 = baseInputStream.ReadByte();
len2 = baseInputStream.ReadByte();
if ((len1 < 0) || (len2 < 0))
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(len1);
headCRC.Update(len2);
int extraLen = (len1 << 8) | len2;
for (int i = 0; i < extraLen; i++)
{
int readByte = baseInputStream.ReadByte();
if (readByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(readByte);
}
}
// 8. Read file name
if ((flags & GZipConstants.FNAME) != 0)
{
int readByte;
while ((readByte = baseInputStream.ReadByte()) > 0)
{
headCRC.Update(readByte);
}
if (readByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(readByte);
}
// 9. Read comment
if ((flags & GZipConstants.FCOMMENT) != 0)
{
int readByte;
while ((readByte = baseInputStream.ReadByte()) > 0)
{
headCRC.Update(readByte);
}
if (readByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
headCRC.Update(readByte);
}
// 10. Read header CRC
if ((flags & GZipConstants.FHCRC) != 0)
{
int tempByte;
int crcval = baseInputStream.ReadByte();
if (crcval < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
tempByte = baseInputStream.ReadByte();
if (tempByte < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crcval = (crcval << 8) | tempByte;
if (crcval != ((int)headCRC.Value & 0xffff))
{
throw new GZipException("Header CRC value mismatch");
}
}
readGZIPHeader = true;
}
public EncodedFileInfo(Plugin p, string dirName, string fileName)
{
string section = $"EncodedFile-{dirName}-{fileName}";
if (p.Sections.ContainsKey(section) == false)
{
throw new FileDecodeFailException($"[{dirName}\\{fileName}] does not exists in [{p.FullPath}]");
}
List <string> encodedList = p.Sections[$"EncodedFile-{dirName}-{fileName}"].GetLinesOnce();
if (Ini.GetKeyValueFromLine(encodedList[0], out string key, out string value))
{
throw new FileDecodeFailException("Encoded lines are malformed");
}
// [Stage 1] Concat sliced base64-encoded lines into one string
byte[] decoded;
{
int.TryParse(value, out int blockCount);
encodedList.RemoveAt(0); // Remove "lines=n"
// Each line is 64KB block
if (Ini.GetKeyValueFromLines(encodedList, out List <string> keys, out List <string> base64Blocks))
{
throw new FileDecodeFailException("Encoded lines are malformed");
}
StringBuilder b = new StringBuilder();
foreach (string block in base64Blocks)
{
b.Append(block);
}
switch (b.Length % 4)
{
case 0:
break;
case 1:
throw new FileDecodeFailException("Encoded lines are malformed");
case 2:
b.Append("==");
break;
case 3:
b.Append("=");
break;
}
decoded = Convert.FromBase64String(b.ToString());
}
// [Stage 2] Read final footer
const int finalFooterLen = 0x24;
int finalFooterIdx = decoded.Length - finalFooterLen;
// 0x00 - 0x04 : 4B -> CRC32
uint full_crc32 = BitConverter.ToUInt32(decoded, finalFooterIdx + 0x00);
// 0x0C - 0x0F : 4B -> Zlib Compressed Footer Length
int compressedFooterLen = (int)BitConverter.ToUInt32(decoded, finalFooterIdx + 0x0C);
int compressedFooterIdx = decoded.Length - (finalFooterLen + compressedFooterLen);
// 0x10 - 0x17 : 8B -> Zlib Compressed File Length
int compressedBodyLen = (int)BitConverter.ToUInt64(decoded, finalFooterIdx + 0x10);
// [Stage 3] Validate final footer
this.FinalFooterValid = true;
if (compressedBodyLen != compressedFooterIdx)
{
this.FinalFooterValid = false;
}
uint calcFull_crc32 = Crc32Checksum.Crc32(decoded, 0, finalFooterIdx);
if (full_crc32 != calcFull_crc32)
{
this.FinalFooterValid = false;
}
if (this.FinalFooterValid == false)
{
return;
}
// [Stage 4] Decompress first footer
byte[] rawFooter;
using (MemoryStream rawFooterStream = new MemoryStream())
{
using (MemoryStream ms = new MemoryStream(decoded, compressedFooterIdx, compressedFooterLen))
using (ZLibStream zs = new ZLibStream(ms, CompressionMode.Decompress, CompressionLevel.Default))
{
zs.CopyTo(rawFooterStream);
}
rawFooter = rawFooterStream.ToArray();
}
// [Stage 5] Read first footer
this.FirstFooterValid = true;
// 0x200 - 0x207 : 8B -> Length of raw file, in little endian
int rawBodyLen = (int)BitConverter.ToUInt32(rawFooter, 0x200);
// 0x208 - 0x20F : 8B -> Length of zlib-compressed file, in little endian
// Note: In Type 2, 0x208 entry is null - padded
int compressedBodyLen2 = (int)BitConverter.ToUInt32(rawFooter, 0x208);
// 0x220 - 0x223 : 4B -> CRC32C Checksum of zlib-compressed file
uint compressedBody_crc32 = BitConverter.ToUInt32(rawFooter, 0x220);
// 0x224 : 1B -> Compress Mode (Type 1 : 00, Type 2 : 01)
byte compMode = rawFooter[0x224];
// 0x225 : 1B -> ZLib Compress Level (Type 1 : 01~09, Type 2 : 00)
byte compLevel = rawFooter[0x225];
// [Stage 6] Validate first footer
if (compMode == 0)
{
this.Mode = EncodedFile.EncodeMode.Compress;
if (compLevel < 1 || 9 < compLevel)
{
this.FirstFooterValid = false;
}
if (compressedBodyLen2 == 0 || (compressedBodyLen2 != compressedBodyLen))
{
this.FirstFooterValid = false;
}
}
else if (compMode == 1)
{
this.Mode = EncodedFile.EncodeMode.Raw;
if (compLevel != 0)
{
this.FirstFooterValid = false;
}
if (compressedBodyLen2 != 0)
{
this.FirstFooterValid = false;
}
}
else // Wrong compMode
{
this.FirstFooterValid = false;
}
if (this.FirstFooterValid == false)
{
return;
}
// [Stage 7] Decompress body
if (compMode == (ushort)EncodedFile.EncodeMode.Compress)
{
this.RawBodyStream = new MemoryStream();
using (MemoryStream ms = new MemoryStream(decoded, 0, compressedBodyLen))
using (ZLibStream zs = new ZLibStream(ms, CompressionMode.Decompress, CompressionLevel.Default))
{
zs.CopyTo(this.RawBodyStream);
}
this.RawBodyStream.Position = 0;
this.CompressedBodyValid = true;
}
else if (compMode == (ushort)EncodedFile.EncodeMode.Raw)
{
this.CompressedBodyValid = true;
this.RawBodyStream = new MemoryStream(decoded, 0, rawBodyLen);
}
else
{
throw new InternalException($"Wrong EncodeMode [{compMode}]");
}
// [Stage 8] Validate decompressed body
this.RawBodyValid = true;
uint calcCompBody_crc32 = Crc32Checksum.Crc32(RawBodyStream.ToArray());
if (compressedBody_crc32 != calcCompBody_crc32)
{
this.RawBodyValid = false;
}
// [Stage 9] Return decompressed body stream
this.RawBodyStream.Position = 0;
}
private static MemoryStream Decode(List <string> encodedList)
{
if (Ini.GetKeyValueFromLine(encodedList[0], out string key, out string value))
{
throw new FileDecodeFailException("Encoded lines are malformed");
}
// [Stage 1] Concat sliced base64-encoded lines into one string
byte[] decoded;
{
int.TryParse(value, out int blockCount);
encodedList.RemoveAt(0); // Remove "lines=n"
// Each line is 64KB block
if (Ini.GetKeyValueFromLines(encodedList, out List <string> keys, out List <string> base64Blocks))
{
throw new FileDecodeFailException("Encoded lines are malformed");
}
StringBuilder b = new StringBuilder();
foreach (string block in base64Blocks)
{
b.Append(block);
}
switch (b.Length % 4)
{
case 0:
break;
case 1:
throw new FileDecodeFailException("Encoded lines are malformed");
case 2:
b.Append("==");
break;
case 3:
b.Append("=");
break;
}
decoded = Convert.FromBase64String(b.ToString());
}
// [Stage 2] Read final footer
const int finalFooterLen = 0x24;
int finalFooterIdx = decoded.Length - finalFooterLen;
// 0x00 - 0x04 : 4B -> CRC32
uint full_crc32 = BitConverter.ToUInt32(decoded, finalFooterIdx + 0x00);
// 0x0C - 0x0F : 4B -> Zlib Compressed Footer Length
int compressedFooterLen = (int)BitConverter.ToUInt32(decoded, finalFooterIdx + 0x0C);
int compressedFooterIdx = decoded.Length - (finalFooterLen + compressedFooterLen);
// 0x10 - 0x17 : 8B -> Zlib Compressed File Length
int compressedBodyLen = (int)BitConverter.ToUInt64(decoded, finalFooterIdx + 0x10);
// [Stage 3] Validate final footer
if (compressedBodyLen != compressedFooterIdx)
{
throw new FileDecodeFailException($"Encoded file is corrupted");
}
uint calcFull_crc32 = Crc32Checksum.Crc32(decoded, 0, finalFooterIdx);
if (full_crc32 != calcFull_crc32)
{
throw new FileDecodeFailException($"Encoded file is corrupted");
}
// [Stage 4] Decompress first footer
byte[] rawFooter;
using (MemoryStream rawFooterStream = new MemoryStream())
{
using (MemoryStream ms = new MemoryStream(decoded, compressedFooterIdx, compressedFooterLen))
using (ZLibStream zs = new ZLibStream(ms, CompressionMode.Decompress, CompressionLevel.Default))
{
zs.CopyTo(rawFooterStream);
}
rawFooter = rawFooterStream.ToArray();
}
// [Stage 5] Read first footer
// 0x200 - 0x207 : 8B -> Length of raw file, in little endian
int rawBodyLen = (int)BitConverter.ToUInt32(rawFooter, 0x200);
// 0x208 - 0x20F : 8B -> Length of zlib-compressed file, in little endian
// Note: In Type 2, 0x208 entry is null - padded
int compressedBodyLen2 = (int)BitConverter.ToUInt32(rawFooter, 0x208);
// 0x220 - 0x223 : 4B -> CRC32C Checksum of zlib-compressed file
uint compressedBody_crc32 = BitConverter.ToUInt32(rawFooter, 0x220);
// 0x224 : 1B -> Compress Mode (Type 1 : 00, Type 2 : 01)
byte compMode = rawFooter[0x224];
// 0x225 : 1B -> ZLib Compress Level (Type 1 : 01~09, Type 2 : 00)
byte compLevel = rawFooter[0x225];
// [Stage 6] Validate first footer
if (compMode == 0) // Type 1, zlib
{
if (compressedBodyLen2 == 0 || (compressedBodyLen2 != compressedBodyLen))
{
throw new FileDecodeFailException($"Encoded file is corrupted: compMode");
}
if (compLevel < 1 || 9 < compLevel)
{
throw new FileDecodeFailException($"Encoded file is corrupted: compLevel");
}
}
else if (compMode == 1) // Type 2, Raw
{
if (compressedBodyLen2 != 0)
{
throw new FileDecodeFailException($"Encoded file is corrupted: compMode");
}
if (compLevel != 0)
{
throw new FileDecodeFailException($"Encoded file is corrupted: compLevel");
}
}
else // Wrong compMode
{
throw new FileDecodeFailException($"Encoded file is corrupted: compMode");
}
// [Stage 7] Decompress body
MemoryStream rawBodyStream; // This stream should be alive even after this method returns
if (compMode == 0) // Type 1, zlib
{
rawBodyStream = new MemoryStream();
using (MemoryStream ms = new MemoryStream(decoded, 0, compressedBodyLen))
using (ZLibStream zs = new ZLibStream(ms, CompressionMode.Decompress, false))
{
zs.CopyTo(rawBodyStream);
}
rawBodyStream.Position = 0;
}
else if (compMode == 1) // Type 2, raw
{
rawBodyStream = new MemoryStream(decoded, 0, rawBodyLen);
}
else
{
throw new FileDecodeFailException($"Encoded file is corrupted");
}
// [Stage 8] Validate decompressed body
uint calcCompBody_crc32 = Crc32Checksum.Crc32(rawBodyStream.ToArray());
if (compressedBody_crc32 != calcCompBody_crc32)
{
throw new FileDecodeFailException($"Encoded file is corrupted");
}
// [Stage 9] Return decompressed body stream
rawBodyStream.Position = 0;
return(rawBodyStream);
}
private static Plugin Encode(Plugin p, string dirName, string fileName, byte[] input, EncodeMode mode)
{
byte[] fileNameUTF8 = Encoding.UTF8.GetBytes(fileName);
if (fileName.Length == 0 || 512 <= fileNameUTF8.Length)
{
throw new FileDecodeFailException($"Filename's UTF8 encoded length should be shorter than 512B");
}
// Check Overwrite
bool fileOverwrite = false;
if (p.Sections.ContainsKey(dirName))
{ // [{dirName}] section exists, check if there is already same file encoded
List <string> lines = p.Sections[dirName].GetLines();
if (lines.FirstOrDefault(x => x.Equals(fileName, StringComparison.OrdinalIgnoreCase)) != null)
{
fileOverwrite = true;
}
}
string encodedStr;
using (MemoryStream bodyStream = new MemoryStream())
using (MemoryStream footerStream = new MemoryStream())
using (MemoryStream concatStream = new MemoryStream())
{
// [Stage 1] Compress file with zlib
switch (mode)
{
case EncodeMode.Compress:
{
using (ZLibStream zs = new ZLibStream(bodyStream, CompressionMode.Compress, CompressionLevel.Level6, true))
{
zs.Write(input, 0, input.Length);
}
bodyStream.Position = 0;
}
break;
case EncodeMode.Raw:
{
bodyStream.Write(input, 0, input.Length);
bodyStream.Position = 0;
}
break;
default:
throw new InternalException($"Wrong EncodeMode [{mode}]");
}
// [Stage 2] Generate first footer
byte[] rawFooter = new byte[0x226]; // 0x550
{
// 0x000 - 0x1FF : Filename and its length
rawFooter[0] = (byte)fileNameUTF8.Length;
fileNameUTF8.CopyTo(rawFooter, 1);
for (int i = 1 + fileNameUTF8.Length; i < 0x200; i++)
{
rawFooter[i] = 0; // Null Pad
}
// 0x200 - 0x207 : 8B -> Length of raw file, in little endian
BitConverter.GetBytes(input.Length).CopyTo(rawFooter, 0x200);
switch (mode)
{
case EncodeMode.Compress: // Type 1
// 0x208 - 0x20F : 8B -> Length of zlibed body, in little endian
BitConverter.GetBytes(bodyStream.Length).CopyTo(rawFooter, 0x208);
// 0x210 - 0x21F : 16B -> Null padding
for (int i = 0x210; i < 0x220; i++)
{
rawFooter[i] = 0;
}
break;
case EncodeMode.Raw: // Type 2
// 0x208 - 0x21F : 16B -> Null padding
for (int i = 0x208; i < 0x220; i++)
{
rawFooter[i] = 0;
}
break;
default:
throw new InternalException($"Wrong EncodeMode [{mode}]");
}
// 0x220 - 0x223 : CRC32 of raw file
uint crc32 = Crc32Checksum.Crc32(input);
BitConverter.GetBytes(crc32).CopyTo(rawFooter, 0x220);
// 0x224 : 1B -> Compress Mode (Type 1 : 00, Type 2 : 01)
rawFooter[0x224] = (byte)mode;
// 0x225 : 1B -> ZLib Compress Level (Type 1 : 01 ~ 09, Type 2 : 00)
switch (mode)
{
case EncodeMode.Compress: // Type 1
rawFooter[0x225] = (byte)CompressionLevel.Level6;
break;
case EncodeMode.Raw: // Type 2
rawFooter[0x225] = 0;
break;
default:
throw new InternalException($"Wrong EncodeMode [{mode}]");
}
}
// [Stage 3] Compress first footer
using (ZLibStream zs = new ZLibStream(footerStream, CompressionMode.Compress, CompressionLevel.Default, true))
{
zs.Write(rawFooter, 0, rawFooter.Length);
}
footerStream.Position = 0;
// [Stage 4] Concat body and footer
bodyStream.CopyTo(concatStream);
footerStream.CopyTo(concatStream);
bodyStream.Position = 0;
footerStream.Position = 0;
// [Stage 5] Generate final footer
{
byte[] finalFooter = new byte[0x24];
// 0x00 - 0x04 : 4B -> CRC32 of compressed body and compressed footer
uint crc32 = Crc32Checksum.Crc32(concatStream.ToArray());
BitConverter.GetBytes(crc32).CopyTo(finalFooter, 0x00);
// 0x04 - 0x08 : 4B -> Unknown - Always 1
BitConverter.GetBytes((uint)1).CopyTo(finalFooter, 0x04);
// 0x08 - 0x0B : 4B -> ZLBArchive version (Always 2)
BitConverter.GetBytes((uint)2).CopyTo(finalFooter, 0x08);
// 0x0C - 0x0F : 4B -> Zlib Compressed Footer Length
BitConverter.GetBytes((int)footerStream.Length).CopyTo(finalFooter, 0x0C);
// 0x10 - 0x17 : 8B -> Zlib Compressed File Length
BitConverter.GetBytes(bodyStream.Length).CopyTo(finalFooter, 0x10);
// 0x18 - 0x1B : 4B -> Unknown - Always 1
BitConverter.GetBytes((uint)1).CopyTo(finalFooter, 0x18);
// 0x1C - 0x23 : 8B -> Unknown - Always 0
for (int i = 0x1C; i < 0x24; i++)
{
finalFooter[i] = 0;
}
concatStream.Write(finalFooter, 0, finalFooter.Length);
}
// [Stage 6] Encode body, footer and finalFooter with Base64
encodedStr = Convert.ToBase64String(concatStream.ToArray());
// Remove Base64 Padding (==, =)
if (encodedStr.EndsWith("==", StringComparison.Ordinal))
{
encodedStr = encodedStr.Substring(0, encodedStr.Length - 2);
}
else if (encodedStr.EndsWith("=", StringComparison.Ordinal))
{
encodedStr = encodedStr.Substring(0, encodedStr.Length - 1);
}
}
// [Stage 7] Tokenize encoded string into 4090B.
string section = $"EncodedFile-{dirName}-{fileName}";
List <IniKey> keys = new List <IniKey>();
for (int i = 0; i <= (encodedStr.Length / 4090); i++)
{
if (i < (encodedStr.Length / 4090)) // 1 Line is 4090 characters
{
keys.Add(new IniKey(section, i.ToString(), encodedStr.Substring(i * 4090, 4090))); // X=eJyFk0Fr20AQhe8G...
}
else // Last Iteration
{
keys.Add(new IniKey(section, i.ToString(), encodedStr.Substring(i * 4090, encodedStr.Length - (i * 4090)))); // X=N3q8ryccAAQWuBjqA5QvAAAAAA (end)
keys.Insert(0, new IniKey(section, "lines", i.ToString())); // lines=X
}
}
// [Stage 8] Before writing to file, backup original plugin
string tempFile = Path.GetTempFileName();
File.Copy(p.FullPath, tempFile, true);
// [Stage 9] Write to file
try
{
// Write folder info to [EncodedFolders]
bool writeFolderSection = true;
if (p.Sections.ContainsKey("EncodedFolders"))
{
List <string> folders = p.Sections["EncodedFolders"].GetLines();
if (0 < folders.Count(x => x.Equals(dirName, StringComparison.OrdinalIgnoreCase)))
{
writeFolderSection = false;
}
}
if (writeFolderSection)
{
Ini.WriteRawLine(p.FullPath, "EncodedFolders", dirName, false);
}
// Write file info into [{dirName}]
Ini.SetKey(p.FullPath, dirName, fileName, $"{input.Length},{encodedStr.Length}"); // UncompressedSize,EncodedSize
// Write encoded file into [EncodedFile-{dirName}-{fileName}]
if (fileOverwrite)
{
Ini.DeleteSection(p.FullPath, section); // Delete existing encoded file
}
Ini.SetKeys(p.FullPath, keys); // Write into
}
catch
{ // Error -> Rollback!
File.Copy(tempFile, p.FullPath, true);
throw new FileDecodeFailException($"Error while writing encoded file into [{p.FullPath}]");
}
finally
{ // Delete temp script
File.Delete(tempFile);
}
// [Stage 10] Refresh Plugin
return(p.Project.RefreshPlugin(p));
}
