{"record":{"id":"807dcf331215f476","repo":"inancgumus/learngo","slug":"file-size-len-buf-807dcf","errorCode":null,"errorMessage":"file size < len(buf)","messagePattern":"file size < len\\(buf\\)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"advfuncs/10-image-detector-recover/main.go","lineNumber":95,"sourceCode":"func read(filename string, buf []byte) error {\n\tfile, err := os.Open(filename)\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer file.Close()\n\n\tfi, err := file.Stat()\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif fi.Size() <= int64(len(buf)) {\n\t\treturn fmt.Errorf(\"file size < len(buf)\")\n\t}\n\n\t_, err = io.ReadFull(file, buf)\n\treturn err\n}","sourceCodeStart":77,"sourceCodeEnd":101,"githubUrl":"https://github.com/inancgumus/learngo/blob/3c475a78e54336c6255e925ff66b8ef4da6a2ae7/advfuncs/10-image-detector-recover/main.go#L77-L101","documentation":"read() size guard: when Stat() shows the file is no larger than the byte buffer, there are too few bytes to contain the expected image signature, so the generic error is returned and detect marks the file as invalid. Typical causes: empty files or files truncated below the header length.","triggerScenarios":"Thrown at advfuncs/10-image-detector-recover/main.go:95 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Skip files reported too small; they cannot be valid images.","Improve the message to include the filename and required vs actual size.","Read with io.ReadFull and handle io.ErrUnexpectedEOF for a standard-truncation signal."],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3c475a78e54336c6255e925ff66b8ef4da6a2ae7","analyzedAt":"2026-09-02T10:14:38.492Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T16:17:10.729Z"}