private byte[] getFileZBlock(GrfFile file)
{
/* Get new stream */
var stream = FileManager.Load(filename) as Stream;
if (stream == null)
{
throw new Exception("GE_ERRNO");
}
byte[] data;
using (var br = new System.IO.BinaryReader(stream))
{
br.BaseStream.Seek(file.pos, SeekOrigin.Begin);
data = br.ReadBytes((int)file.compressed_len_aligned);
}
byte[] keyschedule = new byte[0x80];
return(GrfCrypt.GRFProcess(data, file.compressed_len_aligned, file.flags, file.compressed_len, keyschedule));
}
public byte[] GetData(GrfFile file)
{
//not a file
if (file.IsDir())
{
return(null);
}
//empty file
if (file.real_len == 0)
{
return(null);
}
//check if data was already extracted
if (file.data != null)
{
return(file.data);
}
/* Retrieve the unencrypted block */
byte[] zbuf = getFileZBlock(file);
if (zbuf == null)
{
return(null);
}
using (var stream = new InflaterInputStream(new MemoryStream(zbuf)))
{
file.data = new byte[file.real_len];
stream.Read(file.data, 0, file.data.Length);
}
return(file.data);
}
/*! \brief Private function to read GRF0x2xx headers
*
* Reads the information about files within the archive...
* for archive versions 0x02xx
*
* \todo Find GRF versions other than just 0x200 (do any exist?)
*
* \param grf Pointer to the Grf struct to read to
* \param error Pointer to a GrfErrorType struct/enum for error reporting
* \param callback Function to call for each read file. It should return 0 if
* everything is fine, 1 if everything is fine (but further
* reading should stop), or -1 if there has been an error
* \return 0 if everything went fine, 1 if something went wrong
*/
static uint GRF_readVer2_info(System.IO.BinaryReader br, Grf grf, GrfOpenCallback callback)
{
uint i, offset, len, len2;
byte[] buf, zbuf;
/* Check grf */
if (grf.version != 0x200)
{
throw new Exception("GE_NSUP");
}
/* Read the original and compressed sizes */
buf = br.ReadBytes(8);
/* Allocate memory and read the compressed file table */
len = GrfSupport.LittleEndian32(buf, 0);
zbuf = br.ReadBytes((int)len);
if (0 == (len2 = GrfSupport.LittleEndian32(buf, 4)))
{
return(0);
}
/* Allocate memory and uncompress the compressed file table */
Array.Resize(ref buf, (int)len2);
var stream = new InflaterInputStream(new MemoryStream(zbuf));
stream.Read(buf, 0, buf.Length);
stream.Close();
/* Read information about each file */
for (i = offset = 0; i < grf.nfiles; i++)
{
/* Grab the filename length */
len = GrfSupport.getCStringLength(buf, offset) + 1;
/* Make sure its not too large */
if (len >= GrfTypes.GRF_NAMELEN)
{
throw new Exception("GE_CORRUPTED");
}
/* Grab filename */
GrfFile file = new GrfFile();
file.name = GrfSupport.getCString(buf, offset);
offset += len;
/* Grab the rest of the information */
file.compressed_len = GrfSupport.LittleEndian32(buf, (int)offset);
file.compressed_len_aligned = GrfSupport.LittleEndian32(buf, (int)offset + 4);
file.real_len = GrfSupport.LittleEndian32(buf, (int)offset + 8);
file.flags = buf[offset + 0xC];
file.pos = GrfSupport.LittleEndian32(buf, (int)(offset + 0xD)) + (uint)GRF_HEADER_FULL_LEN;
file.hash = GrfSupport.GRF_NameHash(file.name);
file.name = NormalizePath(file.name);
grf.files.Add(file.name, file);
/* Advance to the next file */
offset += 0x11;
/* Run the callback, if we have one */
if (callback != null)
{
callback.doCallback(file);
if (!callback.hasReturned())
{
throw new Exception("NO_RETURN");
}
if (callback.Response < 0)
{
/* Callback function had an error, so we
* have an error
*/
return(1);
}
else if (callback.Response > 0)
{
/* Callback function found the file it needed,
* just exit now
*/
return(0);
}
}
}
/* Calling functions will set success...
* GRF_SETERR(error,GE_SUCCESS,GRF_readVer2_info);
*/
return(0);
}
public void doCallback(GrfFile file)
{
this.file = file;
callback.Invoke(this);
}
