nativeMain.okio.internal.CRC32.kt Maven / Gradle / Ivy
/*
* Copyright (C) 2024 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okio.internal
import kotlinx.cinterop.CValuesRef
import kotlinx.cinterop.UnsafeNumber
import kotlinx.cinterop.addressOf
import kotlinx.cinterop.usePinned
import platform.zlib.crc32
import platform.zlib.uBytefVar
@OptIn(UnsafeNumber::class)
actual class CRC32 {
private var crc = crc32(0u, null, 0u)
actual fun update(content: ByteArray, offset: Int, byteCount: Int) {
content.usePinned {
crc = crc32(crc, it.addressOf(offset) as CValuesRef, byteCount.toUInt())
}
}
actual fun update(content: ByteArray) {
update(content, 0, content.size)
}
actual fun getValue(): Long {
return crc.toLong()
}
actual fun reset() {
crc = crc32(0u, null, 0u)
}
}