/// <summary>
/// Dump this file data to another file.
/// </summary>
/// <param name="toFile">The destination file stream.</param>
/// <returns>Length copied. (If failed, return -1)</returns>
public virtual long DumpData(FileStream toFile)
{
if (this.file == null || !this.file.CanRead)
{
return(-1);
}
return(StreamUtility.CopyBlock(this.file, toFile, this.fileOffset, (int)this.fileSize));
}
/// <summary>
/// Dump this file data to another file.
/// </summary>
/// <param name="toFile">The destination file stream.</param>
/// <returns>Length copied.</returns>
public override long DumpData(FileStream toFile)
{
if (this.file == null || !this.file.CanRead)
{
throw new IOException("Source stream is not accessable!");
}
if (this.fileSize < this.extractSize)
{
// Compressed
return(this.DecompressToFile(toFile));
}
else
{
// Not compressed
byte[] content = StreamUtility.ReadBytesFromStream(this.file, this.fileOffset, (int)this.extractSize);
Debug.WriteLine(String.Format("CRC for file {0} is {1:X4}", this.fileName, Crc32.CalcCrc32(content)));
return(StreamUtility.CopyBlock(this.file, toFile, this.fileOffset, (int)this.extractSize));
}
}
public long DecompressToFile(FileStream toFile)
{
long offset = this.fileOffset;
// Check identifier
ulong identifier = StreamUtility.ReadULongFromStream(this.file, offset);
if (identifier != 0 && identifier != 0x4352494c41594c41)
{
throw new FormatException("File is not compressed by CRILAYLA!");
}
int decompSize = StreamUtility.ReadIntFromStream(this.file, offset + 0x8);
long decompHeaderOffset = StreamUtility.ReadUIntFromStream(this.file, offset + 0xC) + offset + 0x10;
if (decompHeaderOffset + 0x100 != offset + this.fileSize)
{
throw new FormatException("Size mismatch!");
}
// Extract real header
StreamUtility.CopyBlock(this.file, toFile, decompHeaderOffset, 0x100);
//const long input_end = offset + input_size - 0x100 - 1;
//long input_offset = input_end;
//const long output_end = 0x100 + uncompressed_size - 1;
//uint8_t bit_pool = 0;
//int bits_left = 0;
//long bytes_output = 0;
//while ( bytes_output < uncompressed_size )
//{
// if (GET_NEXT_BITS(1))
// {
// long backreference_offset =
// output_end-bytes_output+GET_NEXT_BITS(13)+3;
// long backreference_length = 3;
// // decode variable length coding for length
// enum { vle_levels = 4 };
// int vle_lens[vle_levels] = { 2, 3, 5, 8 };
// int vle_level;
// for (vle_level = 0; vle_level < vle_levels; vle_level++)
// {
// int this_level = GET_NEXT_BITS(vle_lens[vle_level]);
// backreference_length += this_level;
// if (this_level != ((1 << vle_lens[vle_level])-1)) break;
// }
// if (vle_level == vle_levels)
// {
// int this_level;
// do
// {
// this_level = GET_NEXT_BITS(8);
// backreference_length += this_level;
// } while (this_level == 255);
// }
// //printf("0x%08lx backreference to 0x%lx, length 0x%lx\n", output_end-bytes_output, backreference_offset, backreference_length);
// for (int i=0;i<backreference_length;i++)
// {
// output_buffer[output_end-bytes_output] = output_buffer[backreference_offset--];
// bytes_output++;
// }
// }
// else
// {
// // verbatim byte
// output_buffer[output_end-bytes_output] = GET_NEXT_BITS(8);
// //printf("0x%08lx verbatim byte\n", output_end-bytes_output);
// bytes_output++;
// }
//}
//put_bytes_seek(0, outfile, output_buffer, 0x100 + uncompressed_size);
//free(output_buffer);
return(0x100 + decompSize);
}
