forked from didi/rdebug
/
ch.go
116 lines (101 loc) · 3.21 KB
/
ch.go
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package ch
import (
"reflect"
"fmt"
"unsafe"
"encoding/binary"
"net"
"github.com/v2pro/plz/countlog"
)
func Dump(typ reflect.Type) {
fmt.Println("=== " + typ.String() + " ===")
for i := 0; i < typ.NumField(); i++ {
fmt.Println(typ.Field(i).Name, typ.Field(i).Type.String(), typ.Field(i).Type.Kind())
}
}
func FieldOf(typ reflect.Type, name string) *reflect.StructField {
for i := 0; i < typ.NumField(); i++ {
field := typ.Field(i)
if field.Name == name {
return &field
}
}
countlog.Error("event!ch.field not found", "type", typ.String(), "name", name)
return nil
}
func GetUint8(ptr unsafe.Pointer, field *reflect.StructField) uint8 {
if field.Type.Kind() != reflect.Uint8 {
panic(fmt.Sprintf("kind mismatch, expect uint8, actual %v", field.Type.Kind()))
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
return *(*uint8)(fieldPtr)
}
func GetUint16(ptr unsafe.Pointer, field *reflect.StructField) uint16 {
if field.Type.Kind() != reflect.Uint16 {
panic(fmt.Sprintf("kind mismatch, expect uint16, actual %v", field.Type.Kind()))
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
return *(*uint16)(fieldPtr)
}
func SetUint16(ptr unsafe.Pointer, field *reflect.StructField, val uint16) {
if field.Type.Kind() != reflect.Uint16 {
panic("kind mismatch")
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
*(*uint16)(fieldPtr) = val
}
func GetUint32(ptr unsafe.Pointer, field *reflect.StructField) uint32 {
if field.Type.Kind() != reflect.Uint32 {
panic("kind mismatch")
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
return *(*uint32)(fieldPtr)
}
func SetUint32(ptr unsafe.Pointer, field *reflect.StructField, val uint32) {
if field.Type.Kind() != reflect.Uint32 {
panic("kind mismatch")
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
*(*uint32)(fieldPtr) = val
}
func Get16ElementsByteArray(ptr unsafe.Pointer, field *reflect.StructField) [16]byte {
if field.Type.Kind() != reflect.Array || field.Type.Elem().Kind() != reflect.Uint8 || field.Type.Len() != 16 {
panic("kind mismatch")
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
return *(*[16]byte)(fieldPtr)
}
func Set16ElementsByteArray(ptr unsafe.Pointer, field *reflect.StructField, val [16]byte) {
if field.Type.Kind() != reflect.Array || field.Type.Elem().Kind() != reflect.Uint8 || field.Type.Len() != 16 {
panic("kind mismatch")
}
fieldPtr := unsafe.Pointer(uintptr(ptr) + field.Offset)
*(*[16]byte)(fieldPtr) = val
}
func GetPtr(ptr unsafe.Pointer, field *reflect.StructField) unsafe.Pointer {
return unsafe.Pointer(uintptr(ptr) + field.Offset)
}
func Ntohl(i uint32) uint32 {
return binary.BigEndian.Uint32((*(*[4]byte)(unsafe.Pointer(&i)))[:])
}
func Htonl(i uint32) uint32 {
b := make([]byte, 4)
binary.BigEndian.PutUint32(b, i)
return *(*uint32)(unsafe.Pointer(&b[0]))
}
func Ntohs(i uint16) uint16 {
return binary.BigEndian.Uint16((*(*[2]byte)(unsafe.Pointer(&i)))[:])
}
func Htons(i uint16) uint16 {
b := make([]byte, 2)
binary.BigEndian.PutUint16(b, i)
return *(*uint16)(unsafe.Pointer(&b[0]))
}
func Int2ip(nn uint32) net.IP {
ip := make(net.IP, 4)
binary.LittleEndian.PutUint32(ip, nn)
return ip
}
func Ip2int(ip net.IP) uint32 {
return binary.LittleEndian.Uint32(ip)
}