/
adler32.go
66 lines (49 loc) · 1.3 KB
/
adler32.go
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// Copyright Suneido Software Corp. All rights reserved.
// Governed by the MIT license found in the LICENSE file.
package builtin
import (
"hash"
"io"
"hash/adler32"
. "github.com/apmckinlay/gsuneido/core"
)
// The built-in hashes are Adler32, Md5, Sha1, Sha256.
// The implementations are very similar.
// Modifications to any of them should probably be done to the others.
type suAdler32 struct {
ValueBase[suAdler32]
hash hash.Hash32
}
var _ = builtin(Adler32, "(@args)")
func Adler32(th *Thread, as *ArgSpec, args []Value) Value {
h := suAdler32{hash: adler32.New()}
iter := NewArgsIter(as, args)
k, v := iter()
if v == nil {
return h
}
for ; k == nil && v != nil; k, v = iter() {
io.WriteString(h.hash, ToStr(v))
}
return h.value()
}
var _ Value = suAdler32{}
func (h suAdler32) Equal(other any) bool {
return h == other
}
func (suAdler32) Lookup(_ *Thread, method string) Callable {
return adler32Methods[method]
}
var adler32Methods = methods()
var _ = method(adler32_Update, "(string)")
func adler32_Update(this, arg Value) Value {
io.WriteString(this.(suAdler32).hash, ToStr(arg))
return this
}
var _ = method(adler32_Value, "()")
func adler32_Value(this Value) Value {
return this.(suAdler32).value()
}
func (h suAdler32) value() Value {
return IntVal(int(int32(h.hash.Sum32())))
}