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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 TagTest {
@Test
void testConstructor() {
assertEquals(ASN1Object.TAG_SEQUENCE.getNumber(),
new Tag(TagClass.UNIVERSAL, false, ASN1Object.TAG_SEQUENCE.getNumber()).getNumber());
assertEquals(ASN1Object.TAG_SEQUENCE.getCls(),
new Tag(TagClass.UNIVERSAL, false, ASN1Object.TAG_SEQUENCE.getNumber()).getCls());
assertEquals(ASN1Object.TAG_SEQUENCE.isConstructive(),
new Tag(TagClass.UNIVERSAL,
ASN1Object.TAG_SEQUENCE.isConstructive(),
ASN1Object.TAG_SEQUENCE.getNumber())
.isConstructive());
}
@Test
void testParseSuccess() throws ParseException {
// Test basic parsing
assertEquals(0x1,
new Tag(new BytesReader(new Byte[]{ 0x1 })).getNumber());
assertEquals(TagClass.UNIVERSAL,
new Tag(new BytesReader(new Byte[]{ 0x1 })).getCls());
assertFalse(new Tag(new BytesReader(new Byte[]{ 0x1 })).isConstructive());
// Test basic parsing with different class
assertEquals(5,
new Tag(new BytesReader(new Byte[]{ 101 })).getNumber());
assertEquals(TagClass.APPLICATION,
new Tag(new BytesReader(new Byte[]{ 101 })).getCls());
assertTrue(new Tag(new BytesReader(new Byte[]{ 101 })).isConstructive());
// Test different classes
assertEquals(TagClass.UNIVERSAL,
new Tag(new BytesReader(new Byte[]{ 1 })).getCls()); // 0b00000001
assertEquals(TagClass.PRIVATE,
new Tag(new BytesReader(new Byte[]{ -63 })).getCls()); // 0b11000001
assertEquals(TagClass.CONTEXT_SPECIFIC,
new Tag(new BytesReader(new Byte[]{ -127 })).getCls()); // 0b10000001
assertEquals(TagClass.APPLICATION,
new Tag(new BytesReader(new Byte[]{ 65 })).getCls()); // 0b01000001
// Test different numbers
assertEquals(0x10,
new Tag(new BytesReader(new Byte[]{ 0x10 })).getNumber());
assertEquals(31,
new Tag(new BytesReader(new Byte[]{ 31 })).getNumber());
// Test constructive bit
assertFalse(new Tag(new BytesReader(new Byte[]{ 0x1 })).isConstructive());
assertTrue(new Tag(new BytesReader(new Byte[]{ 33 })).isConstructive());
// Test modification
BytesReader reader = new BytesReader(new Byte[]{ 33 });
assertEquals(0, reader.getIndex());
new Tag(reader);
assertEquals(1, reader.getIndex());
}
@Test
void testParseFail() {
// No enough bytes
assertThrows(ParseException.class, () -> {
BytesReader reader = new BytesReader(new Byte[]{ 33 });
reader.require(1, true);
new Tag(reader);
});
// Number zero
assertThrows(ParseException.class, () -> new Tag(new BytesReader(new Byte[]{ 0 })));
}
@Test
void testEncode() {
// Basic encoding
assertArrayEquals(new Byte[]{ 1 }, new Tag(TagClass.UNIVERSAL, false, 1).encodeDER());
assertArrayEquals(new Byte[]{ 31 }, new Tag(TagClass.UNIVERSAL, false, 31).encodeDER());
// With different class
assertArrayEquals(new Byte[]{ -127 }, new Tag(TagClass.CONTEXT_SPECIFIC, false, 1).encodeDER());
assertArrayEquals(new Byte[]{ -61 }, new Tag(TagClass.PRIVATE, false, 3).encodeDER());
assertArrayEquals(new Byte[]{ 71 }, new Tag(TagClass.APPLICATION, false, 7).encodeDER());
// With different constructive bit
assertArrayEquals(new Byte[]{ 63 }, new Tag(TagClass.UNIVERSAL, true, 31).encodeDER());
}
@Test
void testEnforce() {
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.UNIVERSAL, true, 9)));
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.UNIVERSAL, true, 11)));
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.UNIVERSAL, false, 10)));
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.APPLICATION, true, 10)));
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.PRIVATE, true, 10)));
assertThrows(ParseException.class, () ->
new Tag(TagClass.UNIVERSAL, true, 10)
.enforce(new Tag(TagClass.CONTEXT_SPECIFIC, true, 10)));
}
}
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