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// Copyright (c) 2013, Vastech SA (PTY) LTD. All rights reserved.
// http://code.google.com/p/gogoprotobuf/gogoproto
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// +build !appengine
// This file contains the implementation of the proto field accesses using package unsafe.
package proto
import (
"reflect"
"unsafe"
)
func structPointer_InterfaceAt(p structPointer, f field, t reflect.Type) interface{} {
point := unsafe.Pointer(uintptr(p) + uintptr(f))
r := reflect.NewAt(t, point)
return r.Interface()
}
func structPointer_InterfaceRef(p structPointer, f field, t reflect.Type) interface{} {
point := unsafe.Pointer(uintptr(p) + uintptr(f))
r := reflect.NewAt(t, point)
if r.Elem().IsNil() {
return nil
}
return r.Elem().Interface()
}
func copyUintPtr(oldptr, newptr uintptr, size int) {
oldbytes := make([]byte, 0)
oldslice := (*reflect.SliceHeader)(unsafe.Pointer(&oldbytes))
oldslice.Data = oldptr
oldslice.Len = size
oldslice.Cap = size
newbytes := make([]byte, 0)
newslice := (*reflect.SliceHeader)(unsafe.Pointer(&newbytes))
newslice.Data = newptr
newslice.Len = size
newslice.Cap = size
copy(newbytes, oldbytes)
}
func structPointer_Copy(oldptr structPointer, newptr structPointer, size int) {
copyUintPtr(uintptr(oldptr), uintptr(newptr), size)
}
func appendStructPointer(base structPointer, f field, typ reflect.Type) structPointer {
size := typ.Elem().Size()
oldHeader := structPointer_GetSliceHeader(base, f)
newLen := oldHeader.Len + 1
slice := reflect.MakeSlice(typ, newLen, newLen)
bas := toStructPointer(slice)
for i := 0; i < oldHeader.Len; i++ {
newElemptr := uintptr(bas) + uintptr(i)*size
oldElemptr := oldHeader.Data + uintptr(i)*size
copyUintPtr(oldElemptr, newElemptr, int(size))
}
oldHeader.Data = uintptr(bas)
oldHeader.Len = newLen
oldHeader.Cap = newLen
return structPointer(unsafe.Pointer(uintptr(unsafe.Pointer(bas)) + uintptr(uintptr(newLen-1)*size)))
}
// RefBool returns a *bool field in the struct.
func structPointer_RefBool(p structPointer, f field) *bool {
return (*bool)(unsafe.Pointer(uintptr(p) + uintptr(f)))
}
// RefString returns the address of a string field in the struct.
func structPointer_RefString(p structPointer, f field) *string {
return (*string)(unsafe.Pointer(uintptr(p) + uintptr(f)))
}
func structPointer_FieldPointer(p structPointer, f field) structPointer {
return structPointer(unsafe.Pointer(uintptr(p) + uintptr(f)))
}
func structPointer_GetRefStructPointer(p structPointer, f field) structPointer {
return structPointer((*structPointer)(unsafe.Pointer(uintptr(p) + uintptr(f))))
}
func structPointer_GetSliceHeader(p structPointer, f field) *reflect.SliceHeader {
return (*reflect.SliceHeader)(unsafe.Pointer(uintptr(p) + uintptr(f)))
}
func structPointer_Add(p structPointer, size field) structPointer {
return structPointer(unsafe.Pointer(uintptr(p) + uintptr(size)))
}
func structPointer_Len(p structPointer, f field) int {
return len(*(*[]interface{})(unsafe.Pointer(structPointer_GetRefStructPointer(p, f))))
}
// refWord32 is the address of a 32-bit value field.
type refWord32 *uint32
func refWord32_IsNil(p refWord32) bool {
return p == nil
}
func refWord32_Set(p refWord32, o *Buffer, x uint32) {
if len(o.uint32s) == 0 {
o.uint32s = make([]uint32, uint32PoolSize)
}
o.uint32s[0] = x
*p = o.uint32s[0]
o.uint32s = o.uint32s[1:]
}
func refWord32_Get(p refWord32) uint32 {
return *p
}
func structPointer_RefWord32(p structPointer, f field) refWord32 {
return refWord32((*uint32)(unsafe.Pointer(uintptr(p) + uintptr(f))))
}
// refWord64 is like refWord32 but for 32-bit values.
type refWord64 *uint64
func refWord64_Set(p refWord64, o *Buffer, x uint64) {
if len(o.uint64s) == 0 {
o.uint64s = make([]uint64, uint64PoolSize)
}
o.uint64s[0] = x
*p = o.uint64s[0]
o.uint64s = o.uint64s[1:]
}
func refWord64_IsNil(p refWord64) bool {
return p == nil
}
func refWord64_Get(p refWord64) uint64 {
return *p
}
func structPointer_RefWord64(p structPointer, f field) refWord64 {
return refWord64((*uint64)(unsafe.Pointer(uintptr(p) + uintptr(f))))
}
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