/
string_list.go
68 lines (60 loc) · 1.7 KB
/
string_list.go
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// Copyright 2020 DataStax
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package primitive
import (
"fmt"
"io"
)
// [string list]
func ReadStringList(source io.Reader) (decoded []string, err error) {
var length uint16
length, err = ReadShort(source)
if err != nil {
return nil, fmt.Errorf("cannot read [string list] length: %w", err)
}
if length < 0 {
return nil, nil
} else if length == 0 {
return []string{}, nil
}
decoded = make([]string, length)
for i := uint16(0); i < length; i++ {
var str string
str, err = ReadString(source)
if err != nil {
return nil, fmt.Errorf("cannot read [string list] element %d: %w", i, err)
}
decoded[i] = str
}
return decoded, nil
}
func WriteStringList(list []string, dest io.Writer) error {
length := len(list)
if err := WriteShort(uint16(length), dest); err != nil {
return fmt.Errorf("cannot write [string list] length: %w", err)
}
for i, s := range list {
if err := WriteString(s, dest); err != nil {
return fmt.Errorf("cannot write [string list] element %d: %w", i, err)
}
}
return nil
}
func LengthOfStringList(list []string) int {
length := LengthOfShort
for _, s := range list {
length += LengthOfString(s)
}
return length
}