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checksum.scala
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checksum.scala
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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
package compression
import scodec.bits
import scodec.bits.crc.CrcBuilder
import scodec.bits.BitVector
/** Provides various checksums as pipes. */
object checksum {
/** Computes a CRC32 checksum.
* @see [[scodec.bits.crc.crc32]]
*/
def crc32[F[_]]: Pipe[F, Byte, Byte] = fromCrcBuilder(bits.crc.crc32Builder)
/** Computes a CRC32C checksum.
* @see [[scodec.bits.crc.crc32c]]
*/
def crc32c[F[_]]: Pipe[F, Byte, Byte] = fromCrcBuilder(bits.crc.crc32cBuilder)
/** Computes a CRC checksum using the specified polynomial.
* @see [[scodec.bits.crc]]
*/
def crc[F[_]](
poly: BitVector,
initial: BitVector,
reflectInput: Boolean,
reflectOutput: Boolean,
finalXor: BitVector
): Pipe[F, Byte, Byte] =
fromCrcBuilder(bits.crc.builder(poly, initial, reflectInput, reflectOutput, finalXor))
private def fromCrcBuilder[F[_]](builder: CrcBuilder[BitVector]): Pipe[F, Byte, Byte] =
_.chunks
.fold(builder)((builder, bits) => builder.updated(bits.toBitVector))
.map(b => Chunk.byteVector(b.result.bytes))
.unchunks
}