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package model.asn1;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class ASN1LengthTest {
@Test
void testConstructor() {
assertEquals(0, new ASN1Length(0).getLength());
assertEquals(1, new ASN1Length(1).getLength());
}
@Test
void testParse() throws Exception { // TODO: Exception
BytesReader reader = new BytesReader(new Byte[]{0x0});
assertEquals(0, new ASN1Length(reader).getLength());
assertEquals(1, reader.getIndex());
reader = new BytesReader(new Byte[]{0x20});
assertEquals(0x20, new ASN1Length(reader).getLength());
assertEquals(1, reader.getIndex());
reader = new BytesReader(new Byte[]{-127, 0x30});
assertEquals(0x30, new ASN1Length(reader).getLength());
assertEquals(2, reader.getIndex());
reader = new BytesReader(new Byte[]{-126, -22, 0x60});
assertEquals(60000, new ASN1Length(reader).getLength());
assertEquals(3, reader.getIndex());
reader = new BytesReader(new Byte[]{-127, 127});
assertEquals(127, new ASN1Length(reader).getLength());
assertEquals(2, reader.getIndex());
reader = new BytesReader(new Byte[]{-124, 1, 1, 1, 1});
assertEquals(16843009, new ASN1Length(reader).getLength());
assertEquals(5, reader.getIndex());
reader = new BytesReader(new Byte[]{-127, -97});
assertEquals(159, new ASN1Length(reader).getLength());
assertEquals(2, reader.getIndex());
}
@Test
void testParseFail() throws ParseException {
// First byte 0b10000000
assertThrows(ParseException.class, () ->
new ASN1Length(new BytesReader(new Byte[]{-128}))
);
// First byte 0b11111111
assertThrows(ParseException.class, () ->
new ASN1Length(new BytesReader(new Byte[]{-1}))
);
// Multibyte, requested 2 bytes but have none.
assertThrows(ParseException.class, () ->
new ASN1Length(new BytesReader(new Byte[]{-126}))
);
// Multibyte, requested 2 bytes but have one.
assertThrows(ParseException.class, () ->
new ASN1Length(new BytesReader(new Byte[]{-126, 0x1}))
);
// But this one should work (0b01111111)
new ASN1Length(new BytesReader(new Byte[]{-127, 127}));
// Multibyte, too long.
assertThrows(ParseException.class, () ->
new ASN1Length(new BytesReader(new Byte[]{-124, -1, -1, -1, -1}))
);
// But this one should work, except for it is too large
new ASN1Length(new BytesReader(new Byte[]{-125, -1, -1, -1}));
}
@Test
void testEncode() {
// Short form
assertArrayEquals(new Byte[]{0x0}, new ASN1Length(0).encodeDER());
assertArrayEquals(new Byte[]{0x1}, new ASN1Length(1).encodeDER());
assertArrayEquals(new Byte[]{127}, new ASN1Length(127).encodeDER());
// Long form
// 0b10000001, 0b10000000
assertArrayEquals(new Byte[]{-127, -128}, new ASN1Length(128).encodeDER());
// 0b10000010, 0b11111111, 0b11111111
assertArrayEquals(new Byte[]{-126, -1, -1}, new ASN1Length(65535).encodeDER());
}
}
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