private static void WriteEncodeBody(BinaryReader br, BinaryWriter bw, PsbStreamContext context, PsbHeader header)
{
bw.Write
(
context.Encode
(
br.ReadBytes((int)(header.OffsetChunkOffsets - header.OffsetNames))
)
);
WriteToEnd(br, bw);
}
public static PsbHeader Load(BinaryReader br, uint key)
{
PsbHeader header = new PsbHeader
{
Signature = br.ReadChars(4),
Version = br.ReadUInt16(),
HeaderEncrypt = br.ReadUInt16()
};
var sig = new string(header.Signature).ToUpperInvariant();
if (sig.StartsWith("MDF"))
{
throw new PsbBadFormatException(PsbBadFormatReason.IsMdf, "Maybe a MDF file");
}
if (!sig.StartsWith("PSB"))
{
throw new PsbBadFormatException(PsbBadFormatReason.Header, "Not a valid PSB file");
}
PsbStreamContext context = new PsbStreamContext(key);
header.HeaderLength = context.ReadUInt32(br);
header.OffsetNames = context.ReadUInt32(br);
header.OffsetStrings = context.ReadUInt32(br);
header.OffsetStringsData = context.ReadUInt32(br);
header.OffsetChunkOffsets = context.ReadUInt32(br);
header.OffsetChunkLengths = context.ReadUInt32(br);
header.OffsetChunkData = context.ReadUInt32(br);
header.OffsetEntries = context.ReadUInt32(br);
if (header.Version > 2)
{
header.Checksum = context.ReadUInt32(br);
}
if (header.Version > 3)
{
header.OffsetExtraChunkOffsets = context.ReadUInt32(br);
header.OffsetExtraChunkLengths = context.ReadUInt32(br);
header.OffsetExtraChunkData = context.ReadUInt32(br);
}
return(header);
}
public static PsbHeader Load(BinaryReader br, uint key)
{
PsbHeader header = new PsbHeader
{
Signature = br.ReadChars(4),
Version = br.ReadUInt16(),
HeaderEncrypt = br.ReadUInt16()
};
if (!new string(header.Signature).ToUpperInvariant().StartsWith("PSB"))
{
throw new BadImageFormatException("Not a valid PSB file");
}
PsbStreamContext context = new PsbStreamContext(key);
header.HeaderLength = context.ReadUInt32(br);
header.OffsetNames = context.ReadUInt32(br);
header.OffsetStrings = context.ReadUInt32(br);
header.OffsetStringsData = context.ReadUInt32(br);
header.OffsetChunkOffsets = context.ReadUInt32(br);
header.OffsetChunkLengths = context.ReadUInt32(br);
header.OffsetChunkData = context.ReadUInt32(br);
header.OffsetEntries = context.ReadUInt32(br);
if (header.Version > 2)
{
header.Checksum = context.ReadUInt32(br);
}
if (header.Version > 3)
{
header.OffsetUnknown1 = context.ReadUInt32(br);
header.OffsetUnknown2 = context.ReadUInt32(br);
header.OffsetResourceOffsets = context.ReadUInt32(br);
}
return(header);
}
/// <summary>
/// Encode (Encrypt/Decrypt) PSB file
/// </summary>
/// <param name="key"></param>
/// <param name="mode"></param>
/// <param name="position"></param>
/// <param name="input"></param>
/// <param name="output"></param>
/// <returns>Unencrypted Header for reference. Usually you shouldn't use it.</returns>
public static PsbHeader Encode(uint key, EncodeMode mode, EncodePosition position, Stream input, Stream output)
{
input.Seek(0, SeekOrigin.Begin);
output.Seek(0, SeekOrigin.Begin);
PsbHeader header = new PsbHeader();
PsbStreamContext context = new PsbStreamContext(key);
BinaryReader br = new BinaryReader(input);
BinaryWriter bw = new BinaryWriter(output);
header.Signature = br.ReadChars(4);
header.Version = br.ReadUInt16();
bw.Write(header.Signature); //Signature
bw.Write(header.Version); //Version
header.HeaderEncrypt = br.ReadUInt16(); //headerEncrypt, sometimes we don't believe it when encoding
header.HeaderLength = br.ReadUInt32();
header.OffsetNames = br.ReadUInt32();
br.BaseStream.Seek(-8, SeekOrigin.Current);
void WriteOriginal()
{
bw.Write(header.HeaderEncrypt);
WriteOriginalPartialHeader(br, bw, header);
WriteOriginalBody(br, bw);
}
switch (position)
{
case EncodePosition.Auto:
bool headerEnc = TestHeaderEncrypted(br.BaseStream, header);
bool bodyEnc = TestBodyEncrypted(br, header);
if (headerEnc && bodyEnc) //MARK: is this possible?
{
mode = EncodeMode.Decrypt;
}
if (!headerEnc && !bodyEnc)
{
mode = EncodeMode.Encrypt;
}
switch (mode)
{
case EncodeMode.Encrypt:
if (header.Version > 2) //Header Encrypted; Body Clean
{
bw.Write((ushort)1);
if (headerEnc)
{
WriteOriginalPartialHeader(br, bw, header);
WriteOriginalBody(br, bw);
break;
}
WriteEncryptPartialHeader(br, bw, context, header);
WriteOriginalBody(br, bw);
break;
}
else //Header Clean; Body Encrpyted
{
bw.Write((ushort)0); //
if (headerEnc)
{
WriteDecryptPartialHeader(br, bw, context, header);
context = new PsbStreamContext(key);
WriteEncodeBody(br, bw, context, header);
}
else
{
WriteOriginalPartialHeader(br, bw, header);
WriteEncodeBody(br, bw, context, header);
}
}
break;
case EncodeMode.Decrypt:
bw.Write((ushort)0); //
if (headerEnc)
{
WriteDecryptPartialHeader(br, bw, context, header);
}
else
{
WriteOriginalPartialHeader(br, bw, header);
}
if (bodyEnc)
{
WriteEncodeBody(br, bw, context, header);
}
else
{
WriteOriginalBody(br, bw);
}
break;
default:
WriteOriginal();
break;
}
break;
case EncodePosition.Body:
switch (mode)
{
case EncodeMode.Encrypt:
case EncodeMode.Decrypt:
bw.Write(header.HeaderEncrypt);
//We believe file is clean so write original header but encrypt body
WriteOriginalPartialHeader(br, bw, header);
WriteEncodeBody(br, bw, context, header);
break;
default:
WriteOriginal();
break;
}
break;
case EncodePosition.Header:
switch (mode)
{
case EncodeMode.Encrypt:
bw.Write((ushort)1);
WriteEncryptPartialHeader(br, bw, context, header);
WriteOriginalBody(br, bw);
break;
case EncodeMode.Decrypt:
bw.Write((ushort)0); //
WriteDecryptPartialHeader(br, bw, context, header);
WriteOriginalBody(br, bw);
break;
default:
WriteOriginal();
break;
}
break;
case EncodePosition.Full:
switch (mode)
{
case EncodeMode.Encrypt:
bw.Write((ushort)1);
WriteEncryptPartialHeader(br, bw, context, header);
WriteEncodeBody(br, bw, context, header);
break;
case EncodeMode.Decrypt:
bw.Write((ushort)1); //
WriteDecryptPartialHeader(br, bw, context, header);
WriteEncodeBody(br, bw, context, header);
break;
default:
WriteOriginal();
break;
}
break;
default:
WriteOriginal();
break;
}
bw.Flush();
output.Seek(0, SeekOrigin.Begin);
return(header);
}
/// <summary>
/// Assume header is clean
/// </summary>
/// <param name="br"></param>
/// <param name="bw"></param>
/// <param name="context"></param>
/// <param name="header"></param>
private static void WriteEncryptPartialHeader(BinaryReader br, BinaryWriter bw, PsbStreamContext context,
PsbHeader header)
{
var checksumStartPosition = br.BaseStream.Position;
header.HeaderLength = br.ReadUInt32();
header.OffsetNames = br.ReadUInt32();
if (header.HeaderLength == 0)
{
header.HeaderLength = header.OffsetNames;
}
header.OffsetStrings = br.ReadUInt32();
header.OffsetStringsData = br.ReadUInt32();
header.OffsetChunkOffsets = br.ReadUInt32();
header.OffsetChunkLengths = br.ReadUInt32();
header.OffsetChunkData = br.ReadUInt32();
header.OffsetEntries = br.ReadUInt32();
if (header.Version > 2)
{
header.Checksum = br.ReadUInt32();
}
if (header.Version > 3)
{
header.OffsetUnknownOffsets = br.ReadUInt32();
header.OffsetUnknownLengths = br.ReadUInt32();
header.OffsetUnknownData = br.ReadUInt32();
}
var checksumEndPosition = br.BaseStream.Position;
context.Write(header.HeaderLength, bw);
context.Write(header.OffsetNames, bw);
context.Write(header.OffsetStrings, bw);
context.Write(header.OffsetStringsData, bw);
context.Write(header.OffsetChunkOffsets, bw);
context.Write(header.OffsetChunkLengths, bw);
context.Write(header.OffsetChunkData, bw);
context.Write(header.OffsetEntries, bw);
if (header.Version > 2)
{
int checkLength = 32;
br.BaseStream.Seek(checksumStartPosition, SeekOrigin.Begin);
var checkBuffer = new byte[checkLength];
br.BaseStream.Read(checkBuffer, 0, checkLength);
br.BaseStream.Seek(checksumEndPosition, SeekOrigin.Begin); //Jump back
Adler32 adler32 = new Adler32();
adler32.Update(checkBuffer);
header.Checksum = (uint)adler32.Checksum;
if (header.Version == 3)
{
context.Write(header.Checksum, bw);
}
else //PSBv4
{
checkBuffer = BitConverter.GetBytes(header.OffsetUnknownOffsets)
.Concat(BitConverter.GetBytes(header.OffsetUnknownLengths))
.Concat(BitConverter.GetBytes(header.OffsetUnknownData)).ToArray();
adler32.Update(checkBuffer);
header.Checksum = (uint)adler32.Checksum;
context.Write(header.Checksum, bw);
context.Write(header.OffsetUnknownOffsets, bw);
context.Write(header.OffsetUnknownLengths, bw);
context.Write(header.OffsetUnknownData, bw);
}
}
}
/// <summary>
/// Assume header is encrypted
/// </summary>
/// <param name="br"></param>
/// <param name="bw"></param>
/// <param name="context"></param>
/// <param name="header"></param>
private static void WriteDecryptPartialHeader(BinaryReader br, BinaryWriter bw, PsbStreamContext context,
PsbHeader header)
{
header.HeaderLength = context.ReadUInt32(br);
header.OffsetNames = context.ReadUInt32(br);
header.OffsetStrings = context.ReadUInt32(br);
header.OffsetStringsData = context.ReadUInt32(br);
header.OffsetChunkOffsets = context.ReadUInt32(br);
header.OffsetChunkLengths = context.ReadUInt32(br);
header.OffsetChunkData = context.ReadUInt32(br);
header.OffsetEntries = context.ReadUInt32(br);
if (header.Version > 2)
{
header.Checksum = context.ReadUInt32(br);
}
if (header.Version > 3)
{
header.OffsetUnknownOffsets = context.ReadUInt32(br);
header.OffsetUnknownLengths = context.ReadUInt32(br);
header.OffsetUnknownData = context.ReadUInt32(br);
}
//var checksumStartPosition = bw.BaseStream.Position;
bw.Write(header.HeaderLength);
bw.Write(header.OffsetNames);
bw.Write(header.OffsetStrings);
bw.Write(header.OffsetStringsData);
bw.Write(header.OffsetChunkOffsets);
bw.Write(header.OffsetChunkLengths);
bw.Write(header.OffsetChunkData);
bw.Write(header.OffsetEntries);
//var checksumPosition = bw.BaseStream.Position;
if (header.Version > 2)
{
int checkLength = 32;
bw.BaseStream.Seek(-checkLength, SeekOrigin.Current);
var checkBuffer = new byte[checkLength];
bw.BaseStream.Read(checkBuffer, 0, checkLength);
Adler32 adler32 = new Adler32();
adler32.Update(checkBuffer);
header.Checksum = (uint)adler32.Checksum;
if (header.Version == 3)
{
bw.Write(header.Checksum);
}
else //PSBv4
{
checkBuffer = BitConverter.GetBytes(header.OffsetUnknownOffsets)
.Concat(BitConverter.GetBytes(header.OffsetUnknownLengths))
.Concat(BitConverter.GetBytes(header.OffsetUnknownData)).ToArray();
adler32.Update(checkBuffer);
header.Checksum = (uint)adler32.Checksum;
bw.Write(header.Checksum);
bw.Write(header.OffsetUnknownOffsets);
bw.Write(header.OffsetUnknownLengths);
bw.Write(header.OffsetUnknownData);
}
}
}
/// <summary>
/// Encode a value and write using <see cref="BinaryWriter"/>.
/// </summary>
/// <param name="context"></param>
/// <param name="value"></param>
/// <param name="bw"></param>
public static void Write(this PsbStreamContext context, ushort value, BinaryWriter bw)
{
bw.Write(context.Encode(BitConverter.GetBytes(value)));
}
/// <summary>
/// Read a <see cref="ushort"/> from <see cref="BinaryReader"/>, and then encode using <see cref="PsbStreamContext"/>.
/// </summary>
/// <param name="context"></param>
/// <param name="br"></param>
/// <returns></returns>
public static ushort ReadUInt16(this PsbStreamContext context, BinaryReader br)
{
return(BitConverter.ToUInt16(context.Encode(br.ReadBytes(2)), 0));
}
/// <summary>
/// Read bytes from <see cref="BinaryReader"/>, and then encode using <see cref="PsbStreamContext"/>.
/// </summary>
/// <param name="context"></param>
/// <param name="br"></param>
/// <param name="count"></param>
/// <returns></returns>
public static byte[] ReadBytes(this PsbStreamContext context, BinaryReader br, int count)
{
return(context.Encode(br.ReadBytes(count)));
}