{"record":{"id":"0439ca4f2ae68290","repo":"DIYgod/RSSHub","slug":"cannot-inflate-a-stripped-jpeg","errorCode":null,"errorMessage":"cannot inflate a stripped jpeg","messagePattern":"cannot inflate a stripped jpeg","errorType":"exception","errorClass":"Error","httpStatus":503,"severity":"error","filePath":"lib/routes/telegram/channel-media.ts","lineNumber":21,"sourceCode":"import type { TelegramClient } from 'teleproto';\nimport { Api } from 'teleproto';\nimport { returnBigInt as bigInt } from 'teleproto/Helpers.js';\n\nimport { config } from '@/config';\nimport InvalidParameterError from '@/errors/types/invalid-parameter';\nimport type { Route } from '@/types';\nimport cacheModule from '@/utils/cache/index';\n\nimport { getClient, getDocument, getFilename, unwrapMedia } from './tglib/client';\n\n/**\n * https://core.telegram.org/api/files#stripped-thumbnails\n * @param bytes Buffer\n * @returns Buffer jpeg\n */\nfunction ExpandInlineBytes(bytes: Buffer) {\n    if (bytes.length < 3 || bytes[0] !== 0x1) {\n        throw new Error('cannot inflate a stripped jpeg');\n    }\n    const header = Buffer.from([\n        0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43, 0x00, 0x28, 0x1c, 0x1e, 0x23, 0x1e, 0x19, 0x28, 0x23, 0x21, 0x23, 0x2d, 0x2b,\n        0x28, 0x30, 0x3c, 0x64, 0x41, 0x3c, 0x37, 0x37, 0x3c, 0x7b, 0x58, 0x5d, 0x49, 0x64, 0x91, 0x80, 0x99, 0x96, 0x8f, 0x80, 0x8c, 0x8a, 0xa0, 0xb4, 0xe6, 0xc3, 0xa0, 0xaa, 0xda, 0xad, 0x8a, 0x8c, 0xc8, 0xff, 0xcb, 0xda, 0xee,\n        0xf5, 0xff, 0xff, 0xff, 0x9b, 0xc1, 0xff, 0xff, 0xff, 0xfa, 0xff, 0xe6, 0xfd, 0xff, 0xf8, 0xff, 0xdb, 0x00, 0x43, 0x01, 0x2b, 0x2d, 0x2d, 0x3c, 0x35, 0x3c, 0x76, 0x41, 0x41, 0x76, 0xf8, 0xa5, 0x8c, 0xa5, 0xf8, 0xf8, 0xf8,\n        0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 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0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62,\n        0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57,\n        0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a,\n        0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2,","sourceCodeStart":3,"sourceCodeEnd":39,"githubUrl":"https://github.com/DIYgod/RSSHub/blob/bed535e0879dc71c5aff6f1e7bd1ac21ede40115/lib/routes/telegram/channel-media.ts#L3-L39","documentation":"ExpandInlineBytes reconstructs a full JPEG from a Telegram 'stripped thumbnail' (the inline thumbnail format described in core.telegram.org/api/files#stripped-thumbnails). It throws when the input buffer is shorter than 3 bytes or its first byte is not 0x01, which is the version marker that the inflation logic expects. Any other byte means the buffer is not a recognized stripped-thumbnail payload.","triggerScenarios":"streamThumbnail passes size.bytes from an Api.PhotoCachedSize/Api.PhotoStrippedSize into ExpandInlineBytes, but the bytes are empty, truncated, or use a newer/unknown stripped-thumbnail version whose marker is not 0x01.","commonSituations":"A teleproto version change alters how stripped-size bytes are exposed; a corrupt/partial document download yields a short buffer; the channel post references a media type whose thumbnail is a PhotoCachedSize whose bytes do not start with 0x01.","solutions":["Guard callers of ExpandInlineBytes so a short/unknown-version buffer skips the thumbnail rather than crashing the whole media stream.","Confirm the teleproto version pinned in package.json matches the stripped-thumbnail encoding the code assumes (first byte 0x01).","If a new stripped-thumbnail version exists, extend ExpandInlineBytes to branch on the version byte and only throw for truly unknown versions.","Log the byte length and first byte when the guard trips to identify corruption vs. version mismatch."],"exampleFix":"// before\nfunction ExpandInlineBytes(bytes: Buffer) {\n    if (bytes.length < 3 || bytes[0] !== 0x1) {\n        throw new Error('cannot inflate a stripped jpeg');\n    }\n    ...\n}\n\n// after: let the caller decide; return null for unknown versions\nfunction ExpandInlineBytes(bytes: Buffer): Buffer | null {\n    if (bytes.length < 3) {\n        return null;\n    }\n    if (bytes[0] !== 0x1) {\n        return null; // unknown stripped-thumbnail version\n    }\n    ...\n}\n// caller:\nconst inflated = ExpandInlineBytes(size.bytes);\nif (inflated) { yield inflated; } else { yield* streamDocument(client, doc, size.type ?? ''); }","handlingStrategy":"validation","validationCode":"function isStrippable(bytes: Buffer): boolean {\n    return bytes.length >= 3 && bytes[0] === 0x1;\n}\n// before calling ExpandInlineBytes:\n// if (!isStrippable(size.bytes)) { skip thumbnail }","typeGuard":"function isStrippedJpegBytes(bytes: unknown): bytes is Buffer {\n    return Buffer.isBuffer(bytes) && bytes.length >= 3 && bytes[0] === 0x1;\n}","tryCatchPattern":"try {\n    yield ExpandInlineBytes(size.bytes);\n} catch (e) {\n    if (e instanceof Error && /cannot inflate a stripped jpeg/.test(e.message)) {\n        // fall back to streaming the document's largest thumb or the file itself\n        yield* streamDocument(client, doc, size && 'type' in size ? size.type : '');\n        return;\n    }\n    throw e;\n}","preventionTips":["Pin the teleproto version so stripped-thumbnail byte encoding stays predictable.","Validate bytes.length and the version byte before calling ExpandInlineBytes.","Prefer returning null/empty over throwing from low-level binary helpers.","Log the byte length and first byte when inflation is skipped to catch version drift."],"tags":["media","binary","telegram","parsing"],"backgroundTag":null,"analyzedSha":"bed535e0879dc71c5aff6f1e7bd1ac21ede40115","analyzedAt":"2026-08-12T19:29:35.364Z","schemaVersion":2},"datasetVersion":"2026-08-12T23:17:12.415Z"}