Method ProcessChunks

source/DiskImageHelper.cpp:1519–1586

Pre: already matched the WOZ header

// Pre: already matched the WOZ header
eDetectResult CWOZHelper::ProcessChunks(ImageInfo* pImageInfo, uint32_t& dwOffset)
{
	UINT32* pImage32 = (uint32_t*) (pImageInfo->pImageBuffer + sizeof(WOZHeader));
	int imageSizeRemaining = pImageInfo->uImageSize - sizeof(WOZHeader);
	_ASSERT(imageSizeRemaining >= 0);
	if (imageSizeRemaining < 0)
		return eMismatch;

	// A valid WOZ must have exactly one of each of: INFO, TMAP & TRKS chunks (GH#1402)
	bool gotINFO = false;
	bool gotTMAP = false;
	bool gotTRKS = false;

	while(imageSizeRemaining >= sizeof(WOZChunkHdr))
	{
		UINT32 chunkId = *pImage32++;
		UINT32 chunkSize = *pImage32++;
		imageSizeRemaining -= sizeof(WOZChunkHdr);

		switch(chunkId)
		{
			case INFO_CHUNK_ID:
				if (gotINFO) return eMismatch;
				gotINFO = true;
				m_pInfo = (InfoChunkv2*)pImage32;
				if (m_pInfo->v1.diskType != InfoChunk::diskType5_25)
					return eMismatch;
#ifdef _DEBUG
				if (m_pInfo->v1.version >= 3)
				{
					InfoChunkv3* pInfoV3 = (InfoChunkv3*)pImage32;
					LogOutput("WOZ: Largest Flux Track = %d\n", pInfoV3->largestFluxTrack);
				}
#endif
				break;
			case TMAP_CHUNK_ID:
				if (gotTMAP) return eMismatch;
				gotTMAP = true;
				pImageInfo->pWOZTrackMap = (BYTE*) pImage32;
				break;
			case TRKS_CHUNK_ID:
				if (gotTRKS) return eMismatch;
				gotTRKS = true;
				dwOffset = pImageInfo->uOffset = pImageInfo->uImageSize - imageSizeRemaining;	// offset into image of track data
				break;
			case FLUX_CHUNK_ID:	// WOZ v3 (todo)
				break;
			case WRIT_CHUNK_ID:	// WOZ v2 (optional)
				break;
			case META_CHUNK_ID:	// (optional)
				break;
			default:	// no idea what this chunk is, so skip it
				_ASSERT(0);
				break;
		}

		pImage32 = (UINT32*) ((BYTE*)pImage32 + chunkSize);
		imageSizeRemaining -= chunkSize;