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long_string.go
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long_string.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 (
"errors"
"fmt"
"io"
)
// [long string]
func ReadLongString(source io.Reader) (string, error) {
if length, err := ReadInt(source); err != nil {
return "", fmt.Errorf("cannot read [long string] length: %w", err)
} else if length <= 0 {
return "", nil
} else {
decoded := make([]byte, length)
if _, err := io.ReadFull(source, decoded); err != nil {
return "", fmt.Errorf("cannot read [long string] content: %w", err)
}
return string(decoded), nil
}
}
func WriteLongString(s string, dest io.Writer) error {
length := len(s)
if err := WriteInt(int32(length), dest); err != nil {
return fmt.Errorf("cannot write [long string] length: %w", err)
} else if n, err := dest.Write([]byte(s)); err != nil {
return fmt.Errorf("cannot write [long string] length: %w", err)
} else if n < length {
return errors.New("not enough capacity to write [long string] content")
}
return nil
}
func LengthOfLongString(s string) int {
return LengthOfInt + len(s)
}