support for serialized frames

src/commonMain/kotlin/net.sergeych.bintools/CRC.kt

@@ -0,0 +1,51 @@
+@file:OptIn(ExperimentalUnsignedTypes::class)
+
+package net.sergeych.bintools
+
+/**
+ * Common interfacte for all CRC variants. See [crc16], [crc32] and [crc8] for useful shortcuts.
+ */
+interface CRC<T> {
+    val lookupTable: List<T>
+    val value: T
+
+    fun update(inputs: UByteArray)
+    fun reset()
+
+    fun update(input: UByte) {
+        update(ubyteArrayOf(input))
+    }
+
+    fun update(inputs: ByteArray) {
+        update(inputs.toUByteArray())
+    }
+
+    companion object {
+        /**
+         * Calculate crc8 for a data array using a given polynomial (uses CRC8-Bluetooth's polynomial by default)
+         */
+        fun crc8(data: ByteArray, polynomial: UByte = 0xA7.toUByte()): UByte =
+            CRC8(polynomial).also { it.update(data) }.value
+
+        /**
+         * Calculate CRC16 for a data array using a given polynomial (CRC16-CCITT polynomial (0x1021) by default)
+         */
+        fun crc16(data: ByteArray, polynomial: UShort = 0x1021.toUShort()): UShort =
+            CRC16(polynomial).also { it.update(data) }.value
+
+        /**
+         * Calculate crc32 for a given data and polynomial (using CRC32 polynomial by default)
+         */
+        fun crc32(data: ByteArray, polynomial: UInt = 0x04C11DB7.toUInt()): UInt =
+            CRC32(polynomial).also { it.update(data) }.value
+    }
+}
+
+infix fun UShort.shl(bitCount: Int): UShort = (this.toUInt() shl bitCount).toUShort()
+infix fun UShort.shr(bitCount: Int): UShort = (this.toUInt() shr bitCount).toUShort()
+
+infix fun UByte.shl(bitCount: Int): UByte = (this.toUInt() shl bitCount).toUByte()
+infix fun UByte.shr(bitCount: Int): UByte = (this.toUInt() shr bitCount).toUByte()
+
+fun UByte.toBigEndianUShort(): UShort = this.toUShort() shl 8
+fun UByte.toBigEndianUInt(): UInt = this.toUInt() shl 24