Method seekFrom

Sming/Core/Data/Stream/SectionStream.cpp:156–202

}

int SectionStream::seekFrom(int offset, SeekOrigin origin)
{
	uint32_t newOffset = readOffset;

	if(currentSectionIndex < 0 || currentSectionIndex >= sectionCount) {
		return -1;
	}
	auto& sect = sections[currentSectionIndex];

	switch(origin) {
	case SeekOrigin::Start:
		newOffset = sect.start + offset;
		break;

	case SeekOrigin::Current:
		newOffset += offset;
		break;

	case SeekOrigin::End:
		newOffset = uint32_t(sect.end() + offset);
		break;

	default:
		return -1;
	}

	if(newOffset < sect.start || newOffset > sect.end()) {
		return -1;
	}

	int pos = stream->seekFrom(newOffset, SeekOrigin::Start);
	if(uint32_t(pos) != newOffset) {
		return -1;
	}

	readOffset = newOffset;
	sectionOffset = newOffset - sect.start;

	if(newSection >= 0) {
		// Prevent recursion
		auto n = newSection;
		newSection = -1;
		gotoSection(n);
	}

	return sectionOffset;
}