public static Grf grf_callback_open(string fname, string mode, GrfOpenCallback callback)
{
byte[] buf = new byte[GRF_HEADER_FULL_LEN];
uint i;//, zero_fcount = GrfSupport.ToLittleEndian32(7), create_ver = GrfSupport.ToLittleEndian32(0x0200);
Grf grf;
if (fname == null || mode == null)
{
throw new Exception("GE_BADARGS");
}
/* Allocate memory for grf */
grf = new Grf();
/* Copy the filename */
grf.filename = fname;
/* Open the file */
var fStream = FileManager.Load(grf.filename) as Stream;
if (fStream == null)
{
throw new Exception("GE_ERRNO");
}
using (var br = new System.IO.BinaryReader(fStream))
{
grf.allowWrite = !mode.Contains("+") && mode.Contains("w");
//***skipped write***/
/* Read the header */
buf = br.ReadBytes(GRF_HEADER_FULL_LEN);
/* Check the header */
string strA = Encoding.ASCII.GetString(buf);
int v = string.Compare(strA, 0, GRF_HEADER, 0, GRF_HEADER_LEN);
if (v != 0)
{
throw new Exception("GE_INVALID");
}
/* Continued header check...
*
* GRF files that allow encryption of the files inside the archive
* have a hex header following "Master of Magic" (not including
* the nul-terminator) that looks like:
* 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E
*
* GRF files that do not allow it have a hex header that looks like:
* 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*
* GRF files that do not allow it are generally found after a
* "Ragnarok.exe /repak" command has been issued
*/
if (buf[GRF_HEADER_LEN + 1] == 1)
{
grf.allowCrypt = 1;
/* 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E */
for (i = 0; i < 0xF; i++)
{
if (buf[GRF_HEADER_LEN + i] != (int)i)
{
throw new Exception("GE_CORRUPTED");
}
}
}
else if (buf[GRF_HEADER_LEN] == 0)
{
grf.allowCrypt = 0;
/* 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 */
for (i = 0; i < 0xF; i++)
{
if (buf[GRF_HEADER_LEN + i] != 0)
{
new Exception("GE_CORRUPTED");
}
}
}
else
{
throw new Exception("GE_CORRUPTED");
}
/* Okay, so we finally are sure that its a valid GRF/GPF file.
* now its time to read info from it
*/
/* Set the type of archive this is */
grf.type = GRF_TYPE_GRF;
/* Read the version */
grf.version = GrfSupport.LittleEndian32(buf, GRF_HEADER_MID_LEN + 0xC);
/* Read the number of files */
grf.nfiles = GrfSupport.LittleEndian32(buf, GRF_HEADER_MID_LEN + 8);
grf.nfiles -= GrfSupport.LittleEndian32(buf, GRF_HEADER_MID_LEN + 4) + 7;
/* Create the array of files */
grf.files = new Hashtable(StringComparer.OrdinalIgnoreCase);
/* Grab the filesize */
grf.len = (uint)fStream.Length;
/* Seek to the offset of the file tables */
br.BaseStream.Seek(GrfSupport.LittleEndian32(buf, GRF_HEADER_MID_LEN) + GRF_HEADER_FULL_LEN, SeekOrigin.Begin);
/* Run a different function to read the file information based on
* the major version number
*/
switch (grf.version & 0xFF00)
{
case 0x0200:
i = GRF_readVer2_info(br, grf, callback);
break;
default:
throw new Exception("UNSUP_GRF_VERSION");
}
if (i > 0)
{
return(null);
}
}
return(grf);
}
/*! \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);
}
