private ushort getBlockSize(Stream inStream, long hcaOffset)
{
ushort blockSize = 0;
long decChunkOffset;
long compChunkOffset;
//----------------
// 'dec ' offset
//----------------
// get 'dec' chunk offset, if exists (v1.3, maybe others?)
decChunkOffset = ParseFile.GetNextOffsetWithLimitMasked(inStream, hcaOffset,
hcaOffset + MAX_HEADER_SIZE, DEC_CHUNK_BYTES, MASK_BYTES, true);
if (decChunkOffset > -1)
{
blockSize = ParseFile.ReadUshortBE(inStream, decChunkOffset + 4);
}
else
{
//----------------
// 'comp' offset
//----------------
// get 'comp' chunk offset, if exists (v1.3, maybe others?)
compChunkOffset = ParseFile.GetNextOffsetWithLimitMasked(inStream, hcaOffset,
hcaOffset + MAX_HEADER_SIZE, COMP_CHUNK_BYTES, MASK_BYTES, true);
if (compChunkOffset > -1)
{
blockSize = ParseFile.ReadUshortBE(inStream, compChunkOffset + 4);
}
else
{
throw new FormatException(
String.Format("Cannot find 'dec' or 'comp' chunk to determine block size for HCA starting at 0x{0}", hcaOffset.ToString("X8")));
}
}
return(blockSize);
}
