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package libolmpickle
import (
"fmt"
"maunium.net/go/mautrix/crypto/olm"
)
func isZeroByteSlice(bytes []byte) bool {
b := byte(0)
for _, s := range bytes {
b |= s
}
return b == 0
}
func UnpickleUInt8(value []byte) (uint8, int, error) {
if len(value) < 1 {
return 0, 0, fmt.Errorf("unpickle uint8: %w", olm.ErrValueTooShort)
}
return value[0], 1, nil
}
func UnpickleBool(value []byte) (bool, int, error) {
if len(value) < 1 {
return false, 0, fmt.Errorf("unpickle bool: %w", olm.ErrValueTooShort)
}
return value[0] != uint8(0x00), 1, nil
}
func UnpickleBytes(value []byte, length int) ([]byte, int, error) {
if len(value) < length {
return nil, 0, fmt.Errorf("unpickle bytes: %w", olm.ErrValueTooShort)
}
resp := value[:length]
if isZeroByteSlice(resp) {
return nil, length, nil
}
return resp, length, nil
}
func UnpickleUInt32(value []byte) (uint32, int, error) {
if len(value) < 4 {
return 0, 0, fmt.Errorf("unpickle uint32: %w", olm.ErrValueTooShort)
}
var res uint32
count := 0
for i := 3; i >= 0; i-- {
res |= uint32(value[count]) << (8 * i)
count++
}
return res, 4, nil
}
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