assessment/utils/files.go

/* Copyright 2025 Google LLC
//
// 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 utils

import (
	"bufio"
	"os"
)

func ReadFile(filepath string) (string, error) {
	return ReadFileWithExplicitBuffer(filepath, 0)
}

// ReadFileWithExplicitBuffer if bufferSize is greater than 0, then explicit buffer is used.
func ReadFileWithExplicitBuffer(filepath string, bufferSize int) (string, error) {
	file, err := os.Open(filepath)
	if err != nil {
		return "", err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	if bufferSize > 0 {
		scanner.Buffer(make([]byte, bufferSize), bufferSize)
	}
	var content string
	for scanner.Scan() {
		content += scanner.Text() + "\n"
	}
	if err := scanner.Err(); err != nil {
		return "", err
	}
	return content, nil
}