{"record":{"id":"39380e4646ebbaf6","repo":"lutzroeder/netron","slug":"expected-this-position-length-this-length","errorCode":null,"errorMessage":"Expected ${this._position + length - this._length} more bytes. The file might be corrupted. Unexpected end of file.","messagePattern":"Expected (.+?) more bytes\\. The file might be corrupted\\. Unexpected end of file\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"source/browser.js","lineNumber":802,"sourceCode":"            return this._buffer.slice(position, position + length);\n        }\n        const position = this._start + this._position;\n        this.skip(length);\n        if (position % this._size === 0) {\n            const index = Math.floor(position / this._size);\n            const chunk = this._chunks[index];\n            if (chunk && chunk.length === length) {\n                return chunk;\n            }\n        }\n        const buffer = new Uint8Array(length);\n        this._read(buffer, position);\n        return buffer;\n    }\n\n    _fill(length) {\n        if (this._position + length > this._length) {\n            throw new Error(`Expected ${this._position + length - this._length} more bytes. The file might be corrupted. Unexpected end of file.`);\n        }\n        if (!this._buffer || this._position < this._offset || this._position + length > this._offset + this._buffer.length) {\n            this._offset = this._start + this._position;\n            const length = Math.min(0x10000000, this._start + this._length - this._offset);\n            if (!this._buffer || length !== this._buffer.length) {\n                this._buffer = new Uint8Array(length);\n            }\n            this._read(this._buffer, this._offset);\n        }\n        const position = this._start + this._position - this._offset;\n        this._position += length;\n        return position;\n    }\n\n    _read(buffer, offset) {\n        let index = Math.floor(offset / this._size);\n        offset -= index * this._size;\n        const chunk = this._chunks[index++];","sourceCodeStart":784,"sourceCodeEnd":820,"githubUrl":"https://github.com/lutzroeder/netron/blob/d8a543f5f847ef596aa58858d6adcf5d75545f7f/source/browser.js#L784-L820","documentation":"Thrown by the reader's internal _fill(length) when a read of `length` bytes starting at the current position would extend past the end of the stream. This fires on read/stream/peek operations after skip has already advanced the position, and indicates the declared structure is larger than the data available — i.e. a truncated or misidentified file.","triggerScenarios":"Any read of N bytes where this._position + N > this._length: reading a tensor blob, string, or sub-view whose declared size overruns the file; commonly triggered while decoding a binary protobuf or weights section with wrong offsets.","commonSituations":"External data files referenced by a model missing or mismatched (wrong version of the companion .bin), truncated transfers, or feeding a random/misidentified binary file to a model parser so parsed lengths are garbage.","solutions":["Verify file integrity (checksum/size) of every input file, including external data companions","Ensure companion data files match the model version that references them (regenerate the export)","Check that the correct format handler is opening the file; a mis-detected format yields nonsense lengths","Re-export the model from the source framework and retry"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// Ensure remaining bytes cover the declared read length before reading\nif (reader.position + length > reader.length) {\n  throw new Error(`Need ${reader.position + length - reader.length} more bytes; file truncated`);\n}","typeGuard":null,"tryCatchPattern":"try {\n  reader.read(length);\n} catch (e) {\n  if (/more bytes/.test(e.message)) {\n    // input incomplete: stop parsing this section gracefully\n  } else throw e;\n}","preventionTips":["Validate companion data files' sizes against model metadata","Keep model and weights files versioned together as one unit","Fail fast on first out-of-bounds read instead of masking it"],"tags":["binary-reader","truncated-file","corrupt-file","read-past-end"],"backgroundTag":"truncated-or-corrupt-file","analyzedSha":"d8a543f5f847ef596aa58858d6adcf5d75545f7f","analyzedAt":"2026-08-27T19:21:42.082Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}