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package model.asn1.parsing;
import model.asn1.Tag;
import model.asn1.TagClass;
import model.asn1.exceptions.ParseException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class BytesReaderTest {
private BytesReader target;
@BeforeEach
void setup() {
target = new BytesReader(new Byte[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
}
@Test
void testConstructor() {
assertEquals(0, target.getIndex());
assertEquals(10, target.getRawInput().length);
assertArrayEquals(new Byte[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, target.getRawInput());
}
@Test
void testBytesRemaining() {
assertEquals(10, target.bytesRemaining());
target.read(5, true);
assertEquals(5, target.bytesRemaining());
}
@Test
void testRead() {
assertEquals(10, target.bytesRemaining());
assertEquals(0, target.getIndex());
assertArrayEquals(new Byte[]{1, 2}, target.read(2, true));
assertEquals(8, target.bytesRemaining());
assertEquals(2, target.getIndex());
assertArrayEquals(new Byte[]{3}, target.read(1, false));
assertEquals(8, target.bytesRemaining());
assertEquals(2, target.getIndex());
assertArrayEquals(new Byte[]{3, 4, 5, 6, 7}, target.read(5, true));
assertEquals(3, target.bytesRemaining());
assertEquals(7, target.getIndex());
assertArrayEquals(new Byte[]{8, 9, 10}, target.read(3, false));
assertEquals(3, target.bytesRemaining());
assertEquals(7, target.getIndex());
assertArrayEquals(new Byte[]{8, 9, 10}, target.read(3, true));
assertEquals(0, target.bytesRemaining());
assertEquals(10, target.getIndex());
}
@Test
void testRequire() throws Exception { // TODO: Exception testing
assertEquals(10, target.bytesRemaining());
assertEquals(0, target.getIndex());
assertArrayEquals(new Byte[]{1, 2}, target.require(2, true));
assertArrayEquals(new Byte[]{3, 4, 5, 6, 7, 8, 9}, target.require(7, true));
assertArrayEquals(new Byte[]{10}, target.require(1, false));
assertThrows(ParseException.class, () -> target.require(2, true));
assertArrayEquals(new Byte[]{10}, target.require(1, true));
assertThrows(ParseException.class, () -> target.require(1, true));
}
@Test
void testValidateSize() throws Exception { // TODO: Exception testing
assertEquals(10, target.bytesRemaining());
assertEquals(0, target.getIndex());
assertArrayEquals(new Byte[]{1, 2}, target.require(2, true));
assertArrayEquals(new Byte[]{3, 4, 5, 6, 7, 8, 9}, target.require(7, true));
assertArrayEquals(new Byte[]{10}, target.require(1, false));
target.validateSize(1);
assertThrows(ParseException.class, () -> target.validateSize(2));
assertArrayEquals(new Byte[]{10}, target.require(1, true));
assertThrows(ParseException.class, () -> target.validateSize(1));
}
@Test
void testDetectTag() throws Exception {
final BytesReader reader = new BytesReader(new Byte[]{-95, 0});
assertTrue(reader.detectTag(new Tag(TagClass.CONTEXT_SPECIFIC, true, 1)));
assertFalse(reader.detectTag(new Tag(TagClass.CONTEXT_SPECIFIC, true, 0)));
assertFalse(reader.detectTag(new Tag(TagClass.UNIVERSAL, true, 0)));
assertFalse(reader.detectTag(new Tag(TagClass.CONTEXT_SPECIFIC, false, 0)));
}
@Test
void testGetTag() throws Exception {
BytesReader reader = new BytesReader(new Byte[]{-95, 0});
assertEquals(1, reader.getTag(false).getNumber());
reader = new BytesReader(new Byte[]{-96, 0, -95, 0});
assertEquals(1, reader.getTag(true).getNumber());
}
}
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