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| 1 | +package kotlinx.serialization.cbor |
| 2 | + |
| 3 | +import kotlinx.serialization.decodeFromByteArray |
| 4 | +import kotlinx.serialization.encodeToByteArray |
| 5 | +import kotlin.test.Test |
| 6 | +import kotlin.test.assertEquals |
| 7 | + |
| 8 | +class CborNumberEncodingTest { |
| 9 | + |
| 10 | + // 0-23 packs into a single byte |
| 11 | + @Test |
| 12 | + fun testEncodingLengthOfTinyNumbers() { |
| 13 | + val tinyNumbers = listOf(0, 1, 23) |
| 14 | + for (number in tinyNumbers) { |
| 15 | + assertEquals( |
| 16 | + expected = 1, |
| 17 | + actual = Cbor.encodeToByteArray(number).size, |
| 18 | + "when encoding value '$number'" |
| 19 | + ) |
| 20 | + } |
| 21 | + } |
| 22 | + |
| 23 | + // 24..(2^8-1) packs into 2 bytes |
| 24 | + @Test |
| 25 | + fun testEncodingLengthOf8BitNumbers() { |
| 26 | + val tinyNumbers = listOf(24, 127, 128, 255) |
| 27 | + for (number in tinyNumbers) { |
| 28 | + assertEquals( |
| 29 | + expected = 2, |
| 30 | + actual = Cbor.encodeToByteArray(number).size, |
| 31 | + "when encoding value '$number'" |
| 32 | + ) |
| 33 | + } |
| 34 | + } |
| 35 | + |
| 36 | + // 2^8..(2^16-1) packs into 3 bytes |
| 37 | + @Test |
| 38 | + fun testEncodingLengthOf16BitNumbers() { |
| 39 | + val tinyNumbers = listOf(256, 32767, 32768, 65535) |
| 40 | + for (number in tinyNumbers) { |
| 41 | + assertEquals( |
| 42 | + expected = 3, |
| 43 | + actual = Cbor.encodeToByteArray(number).size, |
| 44 | + "when encoding value '$number'" |
| 45 | + ) |
| 46 | + } |
| 47 | + } |
| 48 | + |
| 49 | + // 2^16..(2^32-1) packs into 5 bytes |
| 50 | + @Test |
| 51 | + fun testEncodingLengthOf32BitNumbers() { |
| 52 | + val tinyNumbers = listOf(65536, 2147483647, 2147483648, 4294967295) |
| 53 | + for (number in tinyNumbers) { |
| 54 | + assertEquals( |
| 55 | + expected = 5, |
| 56 | + actual = Cbor.encodeToByteArray(number).size, |
| 57 | + "when encoding value '$number'" |
| 58 | + ) |
| 59 | + } |
| 60 | + } |
| 61 | + |
| 62 | + // 2^32+ packs into 9 bytes |
| 63 | + @Test |
| 64 | + fun testEncodingLengthOfLargeNumbers() { |
| 65 | + val tinyNumbers = listOf(4294967296, 8589934592) |
| 66 | + for (number in tinyNumbers) { |
| 67 | + assertEquals( |
| 68 | + expected = 9, |
| 69 | + actual = Cbor.encodeToByteArray(number).size, |
| 70 | + "when encoding value '$number'" |
| 71 | + ) |
| 72 | + } |
| 73 | + } |
| 74 | + |
| 75 | + @Test |
| 76 | + fun testEncodingLargestPositiveTinyNumber() { |
| 77 | + assertEquals( |
| 78 | + expected = byteArrayOf(23).toList(), |
| 79 | + actual = Cbor.encodeToByteArray(23).toList(), |
| 80 | + ) |
| 81 | + } |
| 82 | + |
| 83 | + @Test |
| 84 | + fun testDecodingLargestPositiveTinyNumber() { |
| 85 | + assertEquals( |
| 86 | + expected = 23, |
| 87 | + actual = Cbor.decodeFromByteArray(byteArrayOf(23)), |
| 88 | + ) |
| 89 | + } |
| 90 | + |
| 91 | + |
| 92 | + @Test |
| 93 | + fun testEncodingLargestNegativeTinyNumber() { |
| 94 | + assertEquals( |
| 95 | + expected = byteArrayOf(55).toList(), |
| 96 | + actual = Cbor.encodeToByteArray(-24).toList(), |
| 97 | + ) |
| 98 | + } |
| 99 | + |
| 100 | + @Test |
| 101 | + fun testDecodingLargestNegativeTinyNumber() { |
| 102 | + assertEquals( |
| 103 | + expected = -24, |
| 104 | + actual = Cbor.decodeFromByteArray(byteArrayOf(55)), |
| 105 | + ) |
| 106 | + } |
| 107 | + |
| 108 | + @Test |
| 109 | + fun testEncodingLargestPositive8BitNumber() { |
| 110 | + val bytes = listOf(24, 255).map { it.toByte() } |
| 111 | + assertEquals( |
| 112 | + expected = bytes, |
| 113 | + actual = Cbor.encodeToByteArray(255).toList(), |
| 114 | + ) |
| 115 | + } |
| 116 | + |
| 117 | + @Test |
| 118 | + fun testDecodingLargestPositive8BitNumber() { |
| 119 | + val bytes = listOf(24, 255).map { it.toByte() }.toByteArray() |
| 120 | + assertEquals( |
| 121 | + expected = 255, |
| 122 | + actual = Cbor.decodeFromByteArray(bytes), |
| 123 | + ) |
| 124 | + } |
| 125 | + |
| 126 | + @Test |
| 127 | + fun testEncodingLargestNegative8BitNumber() { |
| 128 | + val bytes = listOf(56, 255).map { it.toByte() } |
| 129 | + assertEquals( |
| 130 | + expected = bytes, |
| 131 | + actual = Cbor.encodeToByteArray(-256).toList(), |
| 132 | + ) |
| 133 | + } |
| 134 | + |
| 135 | + @Test |
| 136 | + fun testDecodingLargestNegative8BitNumber() { |
| 137 | + val bytes = listOf(56, 255).map { it.toByte() }.toByteArray() |
| 138 | + assertEquals( |
| 139 | + expected = -256, |
| 140 | + actual = Cbor.decodeFromByteArray(bytes), |
| 141 | + ) |
| 142 | + } |
| 143 | + |
| 144 | + @Test |
| 145 | + fun testEncodingLargestPositive16BitNumber() { |
| 146 | + val bytes = listOf(25, 255, 255).map { it.toByte() } |
| 147 | + assertEquals( |
| 148 | + expected = bytes, |
| 149 | + actual = Cbor.encodeToByteArray(65535).toList(), |
| 150 | + ) |
| 151 | + } |
| 152 | + |
| 153 | + @Test |
| 154 | + fun testDecodingLargestPositive16BitNumber() { |
| 155 | + val bytes = listOf(25, 255, 255).map { it.toByte() }.toByteArray() |
| 156 | + assertEquals( |
| 157 | + expected = 65535, |
| 158 | + actual = Cbor.decodeFromByteArray(bytes), |
| 159 | + ) |
| 160 | + } |
| 161 | + |
| 162 | + @Test |
| 163 | + fun testEncodingLargestNegative16BitNumber() { |
| 164 | + val bytes = listOf(57, 255, 255).map { it.toByte() } |
| 165 | + assertEquals( |
| 166 | + expected = bytes, |
| 167 | + actual = Cbor.encodeToByteArray(-65536).toList(), |
| 168 | + ) |
| 169 | + } |
| 170 | + |
| 171 | + @Test |
| 172 | + fun testDecodingLargestNegative16BitNumber() { |
| 173 | + val bytes = listOf(57, 255, 255).map { it.toByte() }.toByteArray() |
| 174 | + assertEquals( |
| 175 | + expected = -65536, |
| 176 | + actual = Cbor.decodeFromByteArray(bytes), |
| 177 | + ) |
| 178 | + } |
| 179 | + |
| 180 | + @Test |
| 181 | + fun testEncodingLargestPositive32BitNumber() { |
| 182 | + val bytes = listOf(26, 255, 255, 255, 255).map { it.toByte() } |
| 183 | + assertEquals( |
| 184 | + expected = bytes, |
| 185 | + actual = Cbor.encodeToByteArray(4294967295).toList(), |
| 186 | + ) |
| 187 | + } |
| 188 | + |
| 189 | + @Test |
| 190 | + fun testDecodingLargestPositive32BitNumber() { |
| 191 | + val bytes = listOf(26, 255, 255, 255, 255).map { it.toByte() }.toByteArray() |
| 192 | + assertEquals( |
| 193 | + expected = 4294967295, |
| 194 | + actual = Cbor.decodeFromByteArray(bytes), |
| 195 | + ) |
| 196 | + } |
| 197 | + |
| 198 | + @Test |
| 199 | + fun testEncodingLargestNegative32BitNumber() { |
| 200 | + val bytes = listOf(58, 255, 255, 255, 255).map { it.toByte() } |
| 201 | + assertEquals( |
| 202 | + expected = bytes, |
| 203 | + actual = Cbor.encodeToByteArray(-4294967296).toList(), |
| 204 | + ) |
| 205 | + } |
| 206 | + |
| 207 | + @Test |
| 208 | + fun testDecodingLargestNegative32BitNumber() { |
| 209 | + val bytes = listOf(58, 255, 255, 255, 255).map { it.toByte() }.toByteArray() |
| 210 | + assertEquals( |
| 211 | + expected = -4294967296, |
| 212 | + actual = Cbor.decodeFromByteArray(bytes), |
| 213 | + ) |
| 214 | + } |
| 215 | +} |
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