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gozlib_export.go
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gozlib_export.go
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package gozlib
import (
"reflect"
"sync"
"unsafe"
)
import "C"
type DataStreamEventHandler func(data []byte) uint32
type streamEventHandlers struct {
onRead DataStreamEventHandler
onWrite DataStreamEventHandler
}
var dataStreamEventHandlersTracker = sync.Map{}
func registerStreamEventHandler(id unsafe.Pointer, shandler *streamEventHandlers) {
dataStreamEventHandlersTracker.Store(uintptr(id), shandler)
}
func unregisterStreamEventHandler(id unsafe.Pointer) {
dataStreamEventHandlersTracker.Delete(uintptr(id))
}
const uintptrSize = C.ulong(unsafe.Sizeof(uintptr(0)))
func findStreamEventHandler(ptr unsafe.Pointer) *streamEventHandlers {
dsEventHandlerId := uintptr(ptr)
if dsEventHandlerId == 0 {
panic("event handler id cannot be nil")
}
shandlerValue, exists := dataStreamEventHandlersTracker.Load(dsEventHandlerId)
if !exists {
panic("event handler not found")
}
return shandlerValue.(*streamEventHandlers)
}
//export GoStreamDataInputHandler
func GoStreamDataInputHandler(ptr unsafe.Pointer, buffer unsafe.Pointer, bufferLength uint32) uint32 {
shandler := findStreamEventHandler(ptr)
var bufferSlice []byte
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&bufferSlice))
hdr.Data = uintptr(buffer)
hdr.Len = int(bufferLength)
hdr.Cap = int(bufferLength)
return shandler.onRead(bufferSlice)
}
//export GoStreamDataOutputHandler
func GoStreamDataOutputHandler(ptr unsafe.Pointer, buffer unsafe.Pointer, bufferLength uint32) uint32 {
shandler := findStreamEventHandler(ptr)
var bufferSlice []byte
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&bufferSlice))
hdr.Data = uintptr(buffer)
hdr.Len = int(bufferLength)
hdr.Cap = int(bufferLength)
return shandler.onWrite(bufferSlice)
}