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|
package mangler
import (
"reflect"
"unsafe"
"github.com/modern-go/reflect2"
)
type (
byteser interface{ Bytes() []byte }
stringer interface{ String() string }
binarymarshaler interface{ MarshalBinary() ([]byte, error) }
textmarshaler interface{ MarshalText() ([]byte, error) }
jsonmarshaler interface{ MarshalJSON() ([]byte, error) }
)
func append_uint16(b []byte, u uint16) []byte {
return append(b, // LE
byte(u),
byte(u>>8),
)
}
func append_uint32(b []byte, u uint32) []byte {
return append(b, // LE
byte(u),
byte(u>>8),
byte(u>>16),
byte(u>>24),
)
}
func append_uint64(b []byte, u uint64) []byte {
return append(b, // LE
byte(u),
byte(u>>8),
byte(u>>16),
byte(u>>24),
byte(u>>32),
byte(u>>40),
byte(u>>48),
byte(u>>56),
)
}
func deref_ptr_mangler(rtype reflect.Type, mangle Mangler, count int) Mangler {
if rtype == nil || mangle == nil || count == 0 {
panic("bad input")
}
// Get reflect2's type for later
// unsafe interface data repacking,
type2 := reflect2.Type2(rtype)
return func(buf []byte, value any) []byte {
// Get raw value data.
ptr := eface_data(value)
// Deref n - 1 number times.
for i := 0; i < count-1; i++ {
if ptr == nil {
// Check for nil values
buf = append(buf, '0')
return buf
}
// Further deref ptr
buf = append(buf, '1')
ptr = *(*unsafe.Pointer)(ptr)
}
if ptr == nil {
// Final nil value check.
buf = append(buf, '0')
return buf
}
// Repack and mangle fully deref'd
value = type2.UnsafeIndirect(ptr)
buf = append(buf, '1')
return mangle(buf, value)
}
}
func iter_slice_mangler(rtype reflect.Type, mangle Mangler) Mangler {
if rtype == nil || mangle == nil {
panic("bad input")
}
// Get reflect2's type for later
// unsafe slice data manipulation.
slice2 := reflect2.Type2(rtype).(*reflect2.UnsafeSliceType)
return func(buf []byte, value any) []byte {
// Get raw value data.
ptr := eface_data(value)
// Get length of slice value.
n := slice2.UnsafeLengthOf(ptr)
for i := 0; i < n; i++ {
// Mangle data at each slice index.
e := slice2.UnsafeGetIndex(ptr, i)
buf = mangle(buf, e)
buf = append(buf, ',')
}
if n > 0 {
// Drop final comma.
buf = buf[:len(buf)-1]
}
return buf
}
}
func iter_array_mangler(rtype reflect.Type, mangle Mangler) Mangler {
if rtype == nil || mangle == nil {
panic("bad input")
}
// Get reflect2's type for later
// unsafe slice data manipulation.
array2 := reflect2.Type2(rtype).(*reflect2.UnsafeArrayType)
n := array2.Len()
return func(buf []byte, value any) []byte {
// Get raw value data.
ptr := eface_data(value)
for i := 0; i < n; i++ {
// Mangle data at each slice index.
e := array2.UnsafeGetIndex(ptr, i)
buf = mangle(buf, e)
buf = append(buf, ',')
}
if n > 0 {
// Drop final comma.
buf = buf[:len(buf)-1]
}
return buf
}
}
func iter_map_mangler(rtype reflect.Type, kmangle, emangle Mangler) Mangler {
if rtype == nil || kmangle == nil || emangle == nil {
panic("bad input")
}
// Get reflect2's type for later
// unsafe map data manipulation.
map2 := reflect2.Type2(rtype).(*reflect2.UnsafeMapType)
key2, elem2 := map2.Key(), map2.Elem()
return func(buf []byte, value any) []byte {
// Get raw value data.
ptr := eface_data(value)
ptr = indirect_ptr(ptr)
// Create iterator for map value.
iter := map2.UnsafeIterate(ptr)
// Check if empty map.
empty := !iter.HasNext()
for iter.HasNext() {
// Get key + elem data as ifaces.
kptr, eptr := iter.UnsafeNext()
key := key2.UnsafeIndirect(kptr)
elem := elem2.UnsafeIndirect(eptr)
// Mangle data for key + elem.
buf = kmangle(buf, key)
buf = append(buf, ':')
buf = emangle(buf, elem)
buf = append(buf, ',')
}
if !empty {
// Drop final comma.
buf = buf[:len(buf)-1]
}
return buf
}
}
func iter_struct_mangler(rtype reflect.Type, manglers []Mangler) Mangler {
if rtype == nil || len(manglers) != rtype.NumField() {
panic("bad input")
}
type field struct {
type2 reflect2.Type
field *reflect2.UnsafeStructField
mangle Mangler
}
// Get reflect2's type for later
// unsafe struct field data access.
struct2 := reflect2.Type2(rtype).(*reflect2.UnsafeStructType)
// Bundle together the fields and manglers.
fields := make([]field, rtype.NumField())
for i := range fields {
fields[i].field = struct2.Field(i).(*reflect2.UnsafeStructField)
fields[i].type2 = fields[i].field.Type()
fields[i].mangle = manglers[i]
if fields[i].type2 == nil ||
fields[i].field == nil ||
fields[i].mangle == nil {
panic("bad input")
}
}
return func(buf []byte, value any) []byte {
// Get raw value data.
ptr := eface_data(value)
for i := range fields {
// Get struct field as iface via offset.
fptr := fields[i].field.UnsafeGet(ptr)
field := fields[i].type2.UnsafeIndirect(fptr)
// Mangle the struct field data.
buf = fields[i].mangle(buf, field)
buf = append(buf, ',')
}
if len(fields) > 0 {
// Drop final comma.
buf = buf[:len(buf)-1]
}
return buf
}
}
func indirect_ptr(p unsafe.Pointer) unsafe.Pointer {
return unsafe.Pointer(&p)
}
func eface_data(a any) unsafe.Pointer {
type eface struct{ _, data unsafe.Pointer }
return (*eface)(unsafe.Pointer(&a)).data
}
|
