{"record":{"id":"ee56cbe2ac006bea","repo":"lutzroeder/netron","slug":"expected-this-position-this-length-more-byt-ee56cb","errorCode":null,"errorMessage":"Expected ${this._position - 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/node.js","lineNumber":33,"sourceCode":"\n    get position() {\n        return this._position;\n    }\n\n    get length() {\n        return this._length;\n    }\n\n    stream(length) {\n        const stream = new node.FileStream(this._file, this._start + this._position, length, this._mtime);\n        this.skip(length);\n        return stream;\n    }\n\n    seek(position) {\n        this._position = position >= 0 ? position : this._length + position;\n        if (this._position > this._length || this._position < 0) {\n            throw new Error(`Expected ${this._position - this._length} more bytes. The file might be corrupted. Unexpected end of file.`);\n        }\n    }\n\n    skip(offset) {\n        this._position += offset;\n        if (this._position > this._length || this._position < 0) {\n            throw new Error(`Expected ${this._position - this._length} more bytes. The file might be corrupted. Unexpected end of file.`);\n        }\n    }\n\n    peek(length) {\n        length = length === undefined ? this._length - this._position : length;\n        if (length < 0x10000000) {\n            const position = this._fill(length);\n            this._position -= length;\n            return this._buffer.subarray(position, position + length);\n        }\n        const position = this._position;","sourceCodeStart":15,"sourceCodeEnd":51,"githubUrl":"https://github.com/lutzroeder/netron/blob/d8a543f5f847ef596aa58858d6adcf5d75545f7f/source/node.js#L15-L51","documentation":"Thrown by the memory-backed stream's seek() when the requested position is beyond the end of the buffer or negative (negative positions are interpreted relative to the end, so only out-of-range values throw). It signals that a model parser attempted to jump past the data available, typically because internal offsets in the file are inconsistent with its actual size.","triggerScenarios":"Calling seek(position) with position > stream length or a negative position whose absolute value exceeds length; commonly triggered by model-format code following a stored offset field into a truncated file.","commonSituations":"Truncated or corrupted model files (interrupted download/export), files where a length-prefixed section claims more data than present, or passing a negative seek offset when the intent was relative skipping.","solutions":["Verify the file size and integrity (re-download or re-export the model).","Check the parser logic that computed the position — a stored offset/length field read with the wrong endianness or type can yield huge values.","Wrap seek() calls in try-catch to convert this into a user-facing 'corrupted file' message."],"exampleFix":"// before\nstream.seek(offsetFromHeader);\n\n// after\nif (offsetFromHeader < 0 || offsetFromHeader > stream.length) {\n    throw new Error(`Header offset ${offsetFromHeader} out of range for file of ${stream.length} bytes`);\n}\nstream.seek(offsetFromHeader);","handlingStrategy":"validation","validationCode":"function safeSeek(stream, position) {\n    const abs = position >= 0 ? position : stream.length + position;\n    if (abs < 0 || abs > stream.length) {\n        throw new Error(`seek(${position}) out of range for ${stream.length} bytes`);\n    }\n    stream.seek(position);\n}","typeGuard":null,"tryCatchPattern":"try { stream.seek(pos); } catch (e) { if (/more bytes/.test(e.message)) throw new Error('Model file appears truncated'); throw e; }","preventionTips":["Validate stored offsets against file size before seeking.","Checksum model files after download/export.","Remember negative positions are relative to end-of-stream in this API."],"tags":["stream","seek","truncated-file","corrupted-file"],"backgroundTag":"unexpected-end-of-file","analyzedSha":"d8a543f5f847ef596aa58858d6adcf5d75545f7f","analyzedAt":"2026-08-27T19:21:42.082Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}