private void readIndexMap() throws IOException {
MappedByteBuffer mapOffset = makeReadOnlyBuffer(8, 8);
if (mapOffset.getInt() != MultipageTiffWriter.INDEX_MAP_OFFSET_HEADER) {
ReportingUtils.logError("Image map offset header incorrect");
indexMap_ = null;
return;
}
long offset = unsignInt(mapOffset.getInt());
MappedByteBuffer mapHeader = makeReadOnlyBuffer(offset, 8);
int headerCode = mapHeader.getInt();
if (headerCode != MultipageTiffWriter.INDEX_MAP_HEADER) {
ReportingUtils.logError("Image index map header incorrect");
indexMap_ = null;
return;
}
int numMappings = mapHeader.getInt();
MappedByteBuffer mapData = makeReadOnlyBuffer(offset + 8, 24 * numMappings);
for (int i = 0; i < numMappings; i++) {
int channel = mapData.getInt();
int slice = mapData.getInt();
int frame = mapData.getInt();
int position = mapData.getInt();
long imageOffset = mapData.getLong();
indexMap_.put(MDUtils.generateLabel(channel, slice, frame, position), imageOffset);
}
}
