Started implementation on the new bpm file structure

utils/extract_utils.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"archive/tar"
+	"errors"
+	"io"
+	"os"
+)
+
+func ReadTarballContent(tarballPath, fileToExtract string) ([]byte, error) {
+	file, err := os.Open(tarballPath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	tr := tar.NewReader(file)
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+		if header.Name == fileToExtract {
+			if header.Typeflag != tar.TypeReg {
+				return nil, errors.New("file to extract must be a regular file")
+			}
+
+			bytes, err := io.ReadAll(tr)
+			if err != nil {
+				return nil, err
+			}
+			return bytes, nil
+		}
+	}
+
+	return nil, errors.New("could not file in tarball")
+}