For language detection do not try to analyze big files by content (#11971)

modules/git/repo_language_stats.go

@@ -17,7 +17,8 @@ import (
 	"github.com/go-git/go-git/v5/plumbing/object"
 )
 
-const fileSizeLimit int64 = 16 * 1024 * 1024
+const fileSizeLimit int64 = 16 * 1024 // 16 KiB
+const bigFileSize int64 = 1024 * 1024 // 1 MiB
 
 // specialLanguages defines list of languages that are excluded from the calculation
 // unless they are the only language present in repository. Only languages which under
@@ -62,8 +63,11 @@ func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, err
 			return nil
 		}
 
-		// If content can not be read just do detection by filename
+		// If content can not be read or file is too big just do detection by filename
-		content, _ := readFile(f, fileSizeLimit)
+		var content []byte
+		if f.Size <= bigFileSize {
+			content, _ = readFile(f, fileSizeLimit)
+		}
 		if enry.IsGenerated(f.Name, content) {
 			return nil
 		}