public bool Read(BinaryReader br, PatchHeader header)
{
if (br.BaseStream.Position == br.BaseStream.Length)
{
return(false);
}
byte entryCount = br.ReadByte();
if (entryCount == 0)
{
return(false);
}
CKey = new MD5Hash(br.ReadBytes(header.FileKeySize));
DecompressedSize = br.ReadUInt40BE();
Records = new List <PatchRecord>(entryCount);
for (int i = 0; i < entryCount; i++)
{
var entry = new PatchRecord();
entry.Read(br, header);
Records.Add(entry);
}
return(true);
}
public void Read(BinaryReader br, PatchHeader header)
{
EKey = new MD5Hash(br.ReadBytes(header.FileKeySize));
DecompressedSize = br.ReadUInt40BE();
PatchEKey = new MD5Hash(br.ReadBytes(header.PatchEKeySize));
PatchSize = br.ReadUInt32BE();
Ordinal = br.ReadByte();
}
private void Read(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (!stream.CanRead || stream.Length <= 1)
{
throw new NotSupportedException($"Unable to read PatchFile stream");
}
using (var reader = new BinaryReader(stream))
{
PatchHeader.Read(reader);
// read the patch entries
int pageSize = 1 << PatchHeader.PageSize;
long length = reader.BaseStream.Length;
foreach (var offset in GetOffsets(reader))
{
reader.BaseStream.Position = offset;
// buffer the page then read the entries to minimise file reads
using (var ms = new MemoryStream(reader.ReadBytes(pageSize)))
using (var br = new BinaryReader(ms))
{
var block = new PatchEntry();
while (block.Read(br, PatchHeader))
{
_PatchEntries[block.CKey] = block;
block = new PatchEntry();
}
}
}
#region Unknown Data
// Unknown = br.ReadBytes((int)(br.BaseStream.Length - br.BaseStream.Position));
/*
* // the following is unknown entries that comprise of:
* // a keysize byte followed by either a CKey or Ekey
* // the key type relevant size (decompressed/compressed)
* // and optionally an ESpec string
* // blocks are always a pair of 112 bytes then 160, Encoding Entry then Content Entry
* //
* // struct encodin_entry {
* // char _unk0[4]; // always 0
* // char KeySize;
* // char Hash[KeySize];
* // char _unk15[7];
* // uint32_t some_offset;
* //
* // // 0x44 CompressedSize;
* // }
* //
* // struct content_entry {
* // char _unk0[4]; // always 0
* // char KeySize;
* // char Hash[KeySize];
* // char _unk15[7];
* // uint32_t some_offset;
* //
* // // 0x34 DeompressedSize;
* // // 0x6C partial ESpec always ends in 0xA0
* // }
*/
#endregion
Checksum = stream.MD5Hash();
}
}
/// <summary>
/// Creates a new PatchFile
/// </summary>
public PatchFile()
{
PatchHeader = new PatchHeader();
_PatchEntries = new SortedList <MD5Hash, PatchEntry>(new MD5HashComparer());
}
