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iq_unsafe.go
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/
iq_unsafe.go
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// {{{ Copyright (c) Paul R. Tagliamonte <paul@k3xec.com>, 2020-2021
//
// 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 sdr
import (
"fmt"
"unsafe"
)
// UnsafeSamplesAsBytes is a very dangerous function.
//
// Use of the function should be *seriously* discouraged and not used to every
// extent possible. This is only to be used at carefully controlled boundaries
// where safe high-level primitives can't be used for a serious technical
// purpose.
func UnsafeSamplesAsBytes(buf Samples) ([]byte, error) {
var base uintptr
switch buf := buf.(type) {
case SamplesU8:
base = uintptr(unsafe.Pointer(&buf[0]))
case SamplesI8:
base = uintptr(unsafe.Pointer(&buf[0]))
case SamplesI16:
base = uintptr(unsafe.Pointer(&buf[0]))
case SamplesC64:
base = uintptr(unsafe.Pointer(&buf[0]))
default:
return nil, ErrSampleFormatUnknown
}
size := buf.Size()
var b = struct {
addr uintptr
len int
cap int
}{base, size, size}
return *(*[]byte)(unsafe.Pointer(&b)), nil
}
// MustUnsafeSamplesAsBytes will call the very dangerous UnsafeSamplesAsBytes
// function, and add even more unsafe and dangerous behavior on top -- namely,
// a panic if the Samples type can not be represented as a byte slice.
//
// Use of the function should be *seriously* discouraged and not used to every
// extent possible.
func MustUnsafeSamplesAsBytes(buf Samples) []byte {
bufBytes, err := UnsafeSamplesAsBytes(buf)
if err != nil {
panic(fmt.Sprintf("sdr.MustUnsafeSamplesAsBytes: %s", err))
}
return bufBytes
}
// vim: foldmethod=marker