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|
package util
import (
"bytes"
"math"
"github.com/tetratelabs/wazero/api"
)
const (
PtrLen = 4
IntLen = 4
)
type (
i8 interface{ ~int8 | ~uint8 }
i32 interface{ ~int32 | ~uint32 }
i64 interface{ ~int64 | ~uint64 }
Stk_t = uint64
Ptr_t uint32
Res_t int32
)
func View(mod api.Module, ptr Ptr_t, size int64) []byte {
if ptr == 0 {
panic(NilErr)
}
if size == 0 {
return nil
}
if uint64(size) > math.MaxUint32 {
panic(RangeErr)
}
buf, ok := mod.Memory().Read(uint32(ptr), uint32(size))
if !ok {
panic(RangeErr)
}
return buf
}
func Read[T i8](mod api.Module, ptr Ptr_t) T {
if ptr == 0 {
panic(NilErr)
}
v, ok := mod.Memory().ReadByte(uint32(ptr))
if !ok {
panic(RangeErr)
}
return T(v)
}
func Write[T i8](mod api.Module, ptr Ptr_t, v T) {
if ptr == 0 {
panic(NilErr)
}
ok := mod.Memory().WriteByte(uint32(ptr), uint8(v))
if !ok {
panic(RangeErr)
}
}
func Read32[T i32](mod api.Module, ptr Ptr_t) T {
if ptr == 0 {
panic(NilErr)
}
v, ok := mod.Memory().ReadUint32Le(uint32(ptr))
if !ok {
panic(RangeErr)
}
return T(v)
}
func Write32[T i32](mod api.Module, ptr Ptr_t, v T) {
if ptr == 0 {
panic(NilErr)
}
ok := mod.Memory().WriteUint32Le(uint32(ptr), uint32(v))
if !ok {
panic(RangeErr)
}
}
func Read64[T i64](mod api.Module, ptr Ptr_t) T {
if ptr == 0 {
panic(NilErr)
}
v, ok := mod.Memory().ReadUint64Le(uint32(ptr))
if !ok {
panic(RangeErr)
}
return T(v)
}
func Write64[T i64](mod api.Module, ptr Ptr_t, v T) {
if ptr == 0 {
panic(NilErr)
}
ok := mod.Memory().WriteUint64Le(uint32(ptr), uint64(v))
if !ok {
panic(RangeErr)
}
}
func ReadFloat64(mod api.Module, ptr Ptr_t) float64 {
return math.Float64frombits(Read64[uint64](mod, ptr))
}
func WriteFloat64(mod api.Module, ptr Ptr_t, v float64) {
Write64(mod, ptr, math.Float64bits(v))
}
func ReadString(mod api.Module, ptr Ptr_t, maxlen int64) string {
if ptr == 0 {
panic(NilErr)
}
if maxlen <= 0 {
return ""
}
mem := mod.Memory()
maxlen = min(maxlen, math.MaxInt32-1) + 1
buf, ok := mem.Read(uint32(ptr), uint32(maxlen))
if !ok {
buf, ok = mem.Read(uint32(ptr), mem.Size()-uint32(ptr))
if !ok {
panic(RangeErr)
}
}
if i := bytes.IndexByte(buf, 0); i < 0 {
panic(NoNulErr)
} else {
return string(buf[:i])
}
}
func WriteBytes(mod api.Module, ptr Ptr_t, b []byte) {
buf := View(mod, ptr, int64(len(b)))
copy(buf, b)
}
func WriteString(mod api.Module, ptr Ptr_t, s string) {
buf := View(mod, ptr, int64(len(s))+1)
buf[len(s)] = 0
copy(buf, s)
}
|
