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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 IntTest {
@Test
void testConstructor() {
assertEquals(0x2, new Int(Int.TAG, null, 255).getTag().getNumber());
assertEquals(255, new Int(Int.TAG, null, 255).getLong());
}
@Test
void testEncode() {
// Single-byte
assertArrayEquals(new Byte[] { 0x0 }, new Int(Int.TAG, null, 0).encodeValueDER());
assertArrayEquals(new Byte[] { 0x1 }, new Int(Int.TAG, null, 1).encodeValueDER());
assertArrayEquals(new Byte[] { -1 }, new Int(Int.TAG, null, 255).encodeValueDER());
// Multiple bytes
assertArrayEquals(new Byte[] { 0x01, 0x00 }, new Int(Int.TAG, null, 256).encodeValueDER());
assertArrayEquals(new Byte[] { -1, -1 }, new Int(Int.TAG, null, 65535).encodeValueDER());
assertArrayEquals(new Byte[] { 0x01, 0x00, 0x00 }, new Int(Int.TAG, null, 65536).encodeValueDER());
assertArrayEquals(new Byte[] { -1, -1, -1 }, new Int(Int.TAG, null, 16777215).encodeValueDER());
assertArrayEquals(new Byte[] { 0x01, 0x00, 0x00, 0x00 }, new Int(Int.TAG, null, 16777216).encodeValueDER());
assertArrayEquals(new Byte[] { -1, -1, -1, -1 }, new Int(Int.TAG, null, 4294967295L).encodeValueDER());
assertArrayEquals(new Byte[] { -1, -1, -1, -1 }, new Int(Int.TAG, null, 4294967295L).encodeValueDER());
// 2 ^ 63 + 1
assertArrayEquals(new Byte[] { -128, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
new Int(Int.TAG, null, Long.parseUnsignedLong("9223372036854775809")).encodeValueDER());
// Test no leading zeros
// Not 0x00, 0xFF
assertArrayEquals(new Byte[] { -1 }, new Int(Int.TAG, null, 255).encodeValueDER());
// Test no leading ones
// Not 0xFF, 0x80
assertArrayEquals(new Byte[] { -128 }, new Int(Int.TAG, null, -128).encodeValueDER());
// Encode DER
assertArrayEquals(new Byte[] { 0x02, 2, 0x01, 0x00 }, new Int(Int.TAG, null, 256).encodeDER());
}
@Test
void testParse() throws ParseException {
// Single-byte
assertEquals(0, new Int(new BytesReader(new Byte[] { 0x2, 1, 0x0 }), false).getLong());
assertEquals(1, new Int(new BytesReader(new Byte[] { 0x2, 1, 0x1 }), false).getLong());
assertEquals(-1, new Int(new BytesReader(new Byte[] { 0x2, 1, -1 }), false).getLong());
// Multiple bytes
assertEquals(256,
new Int(new BytesReader(new Byte[] { 0x2, 2, 0x01, 0x00 }), false).getLong());
assertEquals(-1,
new Int(new BytesReader(new Byte[] { 0x2, 2, -1, -1 }), false).getLong());
assertEquals(65536,
new Int(new BytesReader(new Byte[] { 0x2, 3, 0x01, 0x00, 0x00 }), false).getLong());
assertEquals(-1,
new Int(new BytesReader(new Byte[] { 0x2, 3, -1, -1, -1 }), false).getLong());
assertEquals(16777216,
new Int(new BytesReader(new Byte[] { 0x2, 4, 0x01, 0x00, 0x00, 0x00 }), false).getLong());
assertEquals(-1,
new Int(new BytesReader(new Byte[] { 0x2, 4, -1, -1, -1, -1 }), false).getLong());
assertEquals(4294967296L,
new Int(new BytesReader(new Byte[] { 0x2, 5, 0x01, 0x00, 0x00, 0x00, 0x00 }),false).getLong());
// 2 ^ 63 + 1
assertEquals(Long.parseUnsignedLong("9223372036854775809"),
new Int(new BytesReader(new Byte[] { 0x2, 9, 0x00, -128, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }),
false).getValue().longValue());
// Test no leading zeros
// Not 0x00, 0xFF
assertEquals(255, new Int(new BytesReader(new Byte[] { 0x02, 0x2, 0x0, -1 }), false).getLong());
// Test no leading ones
// Not 0xFF, 0x80
assertArrayEquals(new Byte[] { -128 }, new Int(Int.TAG, null, -128).encodeValueDER());
}
@Test
void testParseFail() {
// Not enough bytes
assertThrows(ParseException.class, () ->
new Int(new BytesReader(new Byte[]{ 0x2, 0x7, -1, -1, -1, -1, -1, -1 }),
false));
// Zero len
assertThrows(ParseException.class, () ->
new Int(new BytesReader(new Byte[]{ 0x2, 0x0, -1, -1, -1, -1, -1, -1 }),
false));
}
}
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