github.com/inspektor-gadget/inspektor-gadget@v0.28.1/pkg/uprobetracer/bytes.go (about)

     1  // Copyright 2024 The Inspektor Gadget authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package uprobetracer
    16  
    17  import (
    18  	"bytes"
    19  	"encoding/binary"
    20  	"errors"
    21  	"unsafe"
    22  )
    23  
    24  func readFromBytes[T any](obj *T, rawData []byte) error {
    25  	if int(unsafe.Sizeof(*obj)) != len(rawData) {
    26  		return errors.New("reading from bytes: length mismatched")
    27  	}
    28  	buffer := bytes.NewBuffer(rawData)
    29  	err := binary.Read(buffer, binary.NativeEndian, obj)
    30  	if err != nil {
    31  		return err
    32  	}
    33  	return nil
    34  }
    35  
    36  func readStringFromBytes(data []byte, startPos uint32) string {
    37  	res := ""
    38  	for i := startPos; i < uint32(len(data)); i++ {
    39  		if data[i] == 0 {
    40  			return res
    41  		}
    42  		res += string(data[i])
    43  	}
    44  	return ""
    45  }