package tv.porst.swfretools.parser.structures;
import static tv.porst.swfretools.parser.SWFParserHelpers.parseSBits;
import static tv.porst.swfretools.parser.SWFParserHelpers.parseUBits;
import tv.porst.splib.binaryparser.Bits;
import tv.porst.splib.binaryparser.UBits;
import tv.porst.swfretools.parser.SWFBinaryParser;
import tv.porst.swfretools.parser.SWFParserException;
/**
* Parses SWF Rect structures.
*
* @author sp
*/
public final class RectParser {
/**
* Parses a Rect structure from the current position of the input parser stream.
*
* @param parser The parser that parses the input stream.
* @param fieldName Name of the Rect structure in the parent structure.
*
* @return The parsed Rect structure.
*
* @throws SWFParserException Thrown if the rectangle could not be parsed.
*/
public static Rect parse(final SWFBinaryParser parser, final String fieldName) throws SWFParserException {
if (parser == null) {
throw new IllegalArgumentException("Parser argument must not be null");
}
final UBits nBits = parseUBits(parser, 5, 0x00006, fieldName + "::NBits");
// It is unclear what happens if nBits is 0. This situation is not specified
// in the SWF file format reference.
if (nBits.value() == 0) {
parser.align();
return new Rect(nBits, null, null, null, null);
}
final Bits xMin = parseSBits(parser, nBits.value(), 0x00006, fieldName + "::XMin");
final Bits xMax = parseSBits(parser, nBits.value(), 0x00006, fieldName + "::XMax");
final Bits yMin = parseSBits(parser, nBits.value(), 0x00006, fieldName + "::YMin");
final Bits yMax = parseSBits(parser, nBits.value(), 0x00006, fieldName + "::YMax");
parser.align();
return new Rect(nBits, xMin, xMax, yMin, yMax);
}
}