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-LinuxAndroidPlatform.kt
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-LinuxAndroidPlatform.kt
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/*
* Copyright (c) 2023 Matthew Nelson
*
* 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
*
* https://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 io.matthewnelson.secure.random.internal
import kotlinx.cinterop.ByteVar
import kotlinx.cinterop.CPointer
import kotlinx.cinterop.Pinned
import kotlinx.cinterop.addressOf
import platform.posix.EINTR
import platform.posix.errno
/**
* [GetRandom.getrandom] and [URandom.readBytesTo] return
* values (if positive) indicate the number of bytes that were
* put into the [ByteArray]. If it is less than the [size],
* this ensures that the call is repeated until it has been
* completely filled.
* */
internal inline fun Pinned<ByteArray>.fillCompletely(
size: Int,
block: (ptr: CPointer<ByteVar>, length: Int) -> Int
) {
var index = 0
while (index < size) {
val remainder = size - index
val result = block.invoke(addressOf(index), remainder)
if (result < 0) {
when (val err = errno) {
EINTR -> continue // Retry
else -> throw errnoToSecRandomCopyException(err)
}
} else {
index += result
}
}
}