private static void ReadDrsFileContents(IDrs drs, BinaryReader b)
{
drs.Files = new List <byte[]> (drs.FileInfo.Count);
foreach (var fileInfo in drs.FileInfo)
{
b.BaseStream.Seek(fileInfo.FileDataOffset, SeekOrigin.Begin);
byte[] fileContents = b.ReadBytes(fileInfo.FileSize);
drs.Files.Add(fileContents);
}
}
static void ReadDrsHeader(IDrs drs, BinaryReader b)
{
var header = new DrsHeader();
drs.Header = header;
// Magic numbers... mhmmmmm...
header.Copyright = b.ReadBytes(40);
header.Version = b.ReadBytes(4);
header.FType = b.ReadBytes(12);
header.TableCount = b.ReadInt32();
header.FileOffset = b.ReadInt32();
}
static void ReadDrsFileInfo(IDrs drs, BinaryReader b, int totalNumFiles)
{
drs.FileInfo = new List <IDrsFileInfo>(totalNumFiles);
foreach (IDrsTableInfo table in drs.TableInfo)
{
b.BaseStream.Seek(table.FileInfoOffset, SeekOrigin.Begin);
for (int j = 0; j < table.NumFiles; ++j)
{
var fileInfo = new DrsFileInfo();
fileInfo.FileId = b.ReadInt32();
fileInfo.FileDataOffset = b.ReadInt32();
fileInfo.FileSize = b.ReadInt32();
drs.FileInfo.Add(fileInfo);
}
}
}
static int ReadDrsTableInfo(IDrs drs, BinaryReader b)
{
drs.TableInfo = new List <IDrsTableInfo>(drs.Header.TableCount);
int totalNumFiles = 0;
for (int i = 0; i < drs.Header.TableCount; ++i)
{
var tableInfo = new DrsTableInfo();
tableInfo.FileType = b.ReadByte();
tableInfo.FileExtension = b.ReadBytes(3);
tableInfo.FileInfoOffset = b.ReadInt32();
tableInfo.NumFiles = b.ReadInt32();
totalNumFiles += tableInfo.NumFiles;
drs.TableInfo.Add(tableInfo);
}
return(totalNumFiles);
}
public bool LoadDrsFile(string filename)
{
bool retval = false;
try {
IDrs drs = DrsReader.ReadDrs(filename);
if (drs != null)
{
this.DRS = drs;
retval = true;
}
}
catch {
retval = false;
}
return(retval);
}
/// <summary>
/// Reads the DRS archive from disk.
/// </summary>
/// <returns>The drs or null.</returns>
/// <param name="filename">Full filename including path.</param>
public static IDrs ReadDrs(string filename)
{
// Need some sanity checks and blahdyyea
// Split into smaller chunkies...
IDrs drs = null;
try {
drs = new Drs();
using (BinaryReader b = new BinaryReader(File.Open(filename, FileMode.Open))) {
ReadDrsHeader(drs, b);
var totalNumFiles = ReadDrsTableInfo(drs, b);
ReadDrsFileInfo(drs, b, totalNumFiles);
ReadDrsFileContents(drs, b);
}
}
catch {
// Failed
drs = null;
}
return(drs);
}
