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p=Number(u.searchParams.get(\"page\")||\"0\");\n if(!Number.isInteger(p)||p<1||p>20) return Response.json({ok:false,error:\"page 1..20 only\"},{status:400});\n const key=`pb/2022-r59-natural-science-a/page-${String(p).padStart(2,\"0\")}.jpg`;\n const res=await blob.get(key);\n const inputBuffer=await res.arrayBuffer();\n const input=new Uint8Array(inputBuffer);\n const sourceSha=await sha256(input);\n const img=await Jimp.fromBuffer(inputBuffer);\n img.resize({w:680});\n const out=await img.getBuffer(\"image/jpeg\",{quality:64});\n const bytes=new Uint8Array(out);\n const encoded=b64(bytes);\n const digest=await sha256(bytes);\n if(u.searchParams.get(\"meta\")===\"1\") return Response.json({ok:true,page:p,input_bytes:input.length,input_sha256:sourceSha,width:img.width,height:img.height,preview_bytes:bytes.length,preview_sha256:digest,b64_length:encoded.length});\n const chunkSize=Math.min(16000,Math.max(1000,Number(u.searchParams.get(\"chunk\")||\"15000\")));\n const part=Math.max(0,Number(u.searchParams.get(\"part\")||\"0\"));\n const start=part*chunkSize;\n return Response.json({ok:true,page:p,part,chunk_size:chunkSize,total_len:encoded.length,start,end:Math.min(start+chunkSize,encoded.length),data:encoded.slice(start,start+chunkSize)});\n}",[165],"567fdeac-0ecb-4fcc-884f-2bf8888d4eaa","page.ts","4e3a2f4c-ad83-11f1-91c9-1607ee4eb77e",12,["D",1789091861925],5,"import { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\nconst KEY = \"pb/2022-r59-natural-science-a/exact.pdf\";\nconst EXACT_SHA = \"baa62634f43206b384ae52f12914b40447d150d41eae4774cfa8c176e9790537\";\n\nfunction b64(bytes: Uint8Array): string {\n let s = \"\";\n const step = 0x8000;\n for (let i = 0; i < bytes.length; i += step) {\n s += String.fromCharCode(...bytes.subarray(i, Math.min(i + step, bytes.length)));\n }\n return btoa(s);\n}\nfunction hex(buf: ArrayBuffer): string {\n return [...new Uint8Array(buf)].map((x) => x.toString(16).padStart(2, \"0\")).join(\"\");\n}\nasync function sha256(bytes: Uint8Array): Promise {\n const copy = new Uint8Array(bytes.byteLength);\n copy.set(bytes);\n return hex(await crypto.subtle.digest(\"SHA-256\", copy));\n}\nfunction latin1(bytes: Uint8Array): string {\n return new TextDecoder(\"latin1\").decode(bytes);\n}\nfunction imageRefs(pdfText: string): number[] {\n const out: number[] = [];\n const re = /\\/Im0\\s+(\\d+)\\s+0\\s+R/g;\n for (const m of pdfText.matchAll(re)) {\n const n = Number(m[1]);\n if (!out.includes(n)) out.push(n);\n }\n return out.slice(0, 20);\n}\nfunction findObjectOffset(text: string, obj: number): number {\n const re = new RegExp(`(?:^|\\\\r\\\\n|\\\\r|\\\\n)${obj} 0 obj(?:\\\\r\\\\n|\\\\r|\\\\n|\\\\s*<<)`, \"g\");\n let m: RegExpExecArray | null;\n let found = -1;\n while ((m = re.exec(text)) !== null) {\n const local = m[0].indexOf(`${obj} 0 obj`);\n found = m.index + local;\n }\n return found;\n}\nfunction extractObjectStream(pdf: Uint8Array, text: string, obj: number): Uint8Array {\n const at = findObjectOffset(text, obj);\n if (at < 0) throw new Error(`object ${obj} not found`);\n const streamWord = text.indexOf(\"stream\", at);\n if (streamWord < 0 || streamWord - at > 1200) throw new Error(`stream for object ${obj} not found`);\n const dict = text.slice(at, streamWord);\n if (!/\\/Subtype\\s*\\/Image/.test(dict) || !/\\/DCTDecode/.test(dict)) throw new Error(`object ${obj} is not DCT image`);\n const lm = dict.match(/\\/Length\\s+(\\d+)/);\n if (!lm) throw new Error(`direct length missing for image object ${obj}`);\n const len = Number(lm[1]);\n let start = streamWord + 6;\n if (text.slice(start, start + 2) === \"\\r\\n\") start += 2;\n else if (text[start] === \"\\n\" || text[start] === \"\\r\") start += 1;\n const bytes = pdf.slice(start, start + len);\n if (bytes.length !== len || bytes[0] !== 0xff || bytes[1] !== 0xd8) throw new Error(`JPEG signature/length failure obj ${obj}`);\n return bytes;\n}\n\nexport default async function(req: Request): Promise {\n const u = new URL(req.url);\n const p = Number(u.searchParams.get(\"page\") || \"0\");\n if (!Number.isInteger(p) || p < 1 || p > 20) return Response.json({ok:false,error:\"page must be 1..20\"},{status:400});\n const res = await blob.get(KEY);\n const pdf = new Uint8Array(await res.arrayBuffer());\n const refs = imageRefs(latin1(pdf));\n if (refs.length !== 20) return Response.json({ok:false,error:`expected 20 Im0 refs, got ${refs.length}`,refs},{status:500});\n const obj = refs[p-1];\n if (u.searchParams.get(\"inspect\") === \"1\") {\n const txt = latin1(pdf);\n const at = txt.indexOf(`${obj} 0 obj`);\n const sw = at >= 0 ? txt.indexOf(\"stream\", at) : -1;\n return Response.json({ok:true,page:p,image_object:obj,object_head:at>=0?txt.slice(at, sw>at?Math.min(sw,at+1600):at+1600):null});\n }\n const jpg = extractObjectStream(pdf, latin1(pdf), obj);\n const digest = await sha256(jpg);\n if (u.searchParams.get(\"raw\") === \"1\") {\n return new Response(jpg,{headers:{\"content-type\":\"image/jpeg\",\"x-pb-page\":String(p),\"x-pb-image-object\":String(obj),\"x-pb-image-sha256\":digest,\"x-pb-source-sha256\":EXACT_SHA}});\n }\n if (u.searchParams.get(\"persist\") === \"1\") {\n const outKey = `pb/2022-r59-natural-science-a/page-${String(p).padStart(2,\"0\")}.jpg`;\n await blob.set(outKey, jpg);\n return Response.json({ok:true,page:p,key:outKey,image_object:obj,bytes:jpg.length,sha256:digest,source_sha256:EXACT_SHA});\n }\n const encoded = b64(jpg);\n if (u.searchParams.get(\"meta\") === \"1\") {\n return Response.json({ok:true,page:p,image_object:obj,bytes:jpg.length,sha256:digest,source_sha256:EXACT_SHA,b64_length:encoded.length});\n }\n if (u.searchParams.has(\"part\")) {\n const part = Math.max(0, Number(u.searchParams.get(\"part\") || \"0\"));\n const chunkSize = Math.min(16000, Math.max(1000, Number(u.searchParams.get(\"chunk\") || \"15000\")));\n const start = part * chunkSize;\n return Response.json({ok:true,page:p,part,chunk_size:chunkSize,total_len:encoded.length,start,end:Math.min(start+chunkSize,encoded.length),data:encoded.slice(start,start+chunkSize)});\n }\n return Response.json({ok:true,page:p,image_object:obj,bytes:jpg.length,sha256:digest,source_sha256:EXACT_SHA,jpeg_base64:encoded});\n}",[173],"aa85ca13-2582-45cd-94bc-2baeaa80b009","ocr_p13.ts","223c3042-ae5b-11f1-83af-1607ee4eb77e",21,["D",1789184186467],"import { blob } from \"https://esm.town/v/std/blob/main.ts\";\nimport { createWorker } from \"npm:tesseract.js\";\nexport default async function(){\n const res=await blob.get(\"pb/2022-r59-natural-science-a/page-13.jpg\");\n const ab=await res.arrayBuffer();\n const worker=await createWorker(\"kor+eng\");\n const {data}=await worker.recognize(new Uint8Array(ab));\n await worker.terminate();\n return {page:13,text:data.text};\n}",[181],"ddf54c4e-39d8-4a61-9fe6-eef7cccd792f","ocr.ts","32e1e0c2-ae5b-11f1-923c-1607ee4eb77e",["D",1789184214342],"import { blob } from \"https://esm.town/v/std/blob/main.ts\";\nimport { createWorker } from \"npm:tesseract.js\";\nexport default async function(req:Request){\n const u=new URL(req.url); const p=Number(u.searchParams.get(\"page\")||\"13\");\n const res=await blob.get(`pb/2022-r59-natural-science-a/page-${String(p).padStart(2,\"0\")}.jpg`);\n const ab=await res.arrayBuffer();\n const worker=await createWorker(\"kor+eng\");\n const {data}=await worker.recognize(new Uint8Array(ab));\n await worker.terminate();\n return Response.json({page:p,text:data.text});\n}",[188],"2de3513b-43b1-46c9-a2b7-ffbedc63c48d","main.ts",4,["D",1789011184401],"// @ts-ignore Val Town supports HTTPS imports; local Node tsc does not resolve them.\nimport { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\nconst TARGET = {\n bytes: 4_830_605,\n sha256: \"baa62634f43206b384ae52f12914b40447d150d41eae4774cfa8c176e9790537\",\n filename: \"2022년_제59회 변리사 1차_자연과학개론_A형.pdf\",\n artlSeq: \"5209594\",\n fileSeq: \"2202058\",\n filePath: \"bbs/Q004/Q004_2202058\",\n};\n\nconst HORAENG = \"https://horaeng.com/wp-content/uploads/2022%EB%85%84_%EC%A0%9C59%ED%9A%8C-%EB%B3%80%EB%A6%AC%EC%82%AC-1%EC%B0%A8_%EC%9E%90%EC%97%B0%EA%B3%BC%ED%95%99%EA%B0%9C%EB%A1%A0_A%ED%98%95-1.pdf\";\nconst QBASE = \"https://www.q-net.or.kr\";\nconst UA = \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36\";\n\nfunction hex(buf: ArrayBuffer): string {\n return [...new Uint8Array(buf)].map((b) => b.toString(16).padStart(2, \"0\")).join(\"\");\n}\nasync function sha256(bytes: Uint8Array): Promise {\n const copy = new Uint8Array(bytes.byteLength);\n copy.set(bytes);\n return hex(await crypto.subtle.digest(\"SHA-256\", copy));\n}\nfunction pdfLike(bytes: Uint8Array): boolean {\n return bytes.byteLength > 1000 && new TextDecoder().decode(bytes.slice(0, 8)).startsWith(\"%PDF-\");\n}\nfunction cookieLine(headers: Headers): string {\n const h = headers as Headers & { getSetCookie?: () => string[] };\n const all = h.getSetCookie?.() ?? (headers.get(\"set-cookie\") ? [headers.get(\"set-cookie\")!] : []);\n return all.map((s) => s.split(\";\", 1)[0]).filter(Boolean).join(\"; \");\n}\nfunction mergeCookies(a: string, b: string): string {\n const m = new Map();\n for (const c of [a, b]) for (const part of c.split(/;\\s*/)) {\n const i = part.indexOf(\"=\"); if (i > 0) m.set(part.slice(0, i), part.slice(i + 1));\n }\n return [...m].map(([k, v]) => `${k}=${v}`).join(\"; \");\n}\nasync function responseBytes(res: Response): Promise {\n return new Uint8Array(await res.arrayBuffer());\n}\nasync function verify(label: string, url: string, bytes: Uint8Array) {\n const digest = await sha256(bytes);\n return {\n label, url, bytes: bytes.byteLength, sha256: digest,\n pdf_like: pdfLike(bytes),\n exact_size: bytes.byteLength === TARGET.bytes,\n exact_sha256: digest === TARGET.sha256,\n exact: bytes.byteLength === TARGET.bytes && digest === TARGET.sha256,\n };\n}\n\nasync function fetchStatic() {\n const res = await fetch(HORAENG, {\n redirect: \"follow\",\n headers: { \"user-agent\": UA, \"accept\": \"application/pdf,*/*;q=0.8\", \"accept-language\": \"ko-KR,ko;q=0.9\" },\n });\n if (!res.ok) throw new Error(`Horaeng HTTP ${res.status}`);\n const bytes = await responseBytes(res);\n return { bytes, audit: await verify(\"horaeng_static\", res.url || HORAENG, bytes) };\n}\n\nasync function qFetch(url: string, init: RequestInit = {}, cookie = \"\") {\n const headers = new Headers(init.headers);\n headers.set(\"user-agent\", UA);\n headers.set(\"accept-language\", \"ko-KR,ko;q=0.9\");\n if (cookie) headers.set(\"cookie\", cookie);\n const res = await fetch(url, { ...init, headers, redirect: \"follow\" });\n return { res, cookie: mergeCookies(cookie, cookieLine(res.headers)) };\n}\n\nasync function fetchQNet() {\n let cookie = \"\";\n let x = await qFetch(`${QBASE}/man001.do?gSite=L&gId=51`, {}, cookie); cookie = x.cookie;\n\n const detailUrl = `${QBASE}/cst003.do?id=cst00302&gSite=L&gId=51`;\n const form = new URLSearchParams({\n page: \"1\", schType: \"\", schText: \"\", artlSeq: TARGET.artlSeq,\n boardId: \"Q004\", code: \"1008\", menuType: \"cst00309\", cst: \"\",\n });\n x = await qFetch(detailUrl, {\n method: \"POST\",\n body: form,\n headers: { \"content-type\": \"application/x-www-form-urlencoded\", referer: detailUrl },\n }, cookie); cookie = x.cookie;\n if (!x.res.ok) throw new Error(`Q-Net detail HTTP ${x.res.status}`);\n const detail = await x.res.text();\n\n let filePath = TARGET.filePath, fileName = TARGET.filename, fileSeq = TARGET.fileSeq;\n const re = /fileDown\\('([^']+)'\\s*,\\s*'([^']+)'\\s*,\\s*'(\\d+)'\\)/g;\n for (const m of detail.matchAll(re)) {\n if (m[2].includes(\"자연과학개론\")) { filePath = m[1]; fileName = m[2]; fileSeq = m[3]; break; }\n }\n const q = new URLSearchParams({\n id: \"cst00302s01\", gSite: \"L\", gId: \"51\", fileCode: \"R001\",\n filePath, fileName, fileSeq, artlSeq: TARGET.artlSeq, href: \"0\",\n });\n const dl = `${QBASE}/cst003.do?${q.toString()}`;\n x = await qFetch(dl, { headers: { referer: detailUrl, accept: \"application/pdf,*/*;q=0.8\" } }, cookie);\n if (!x.res.ok) throw new Error(`Q-Net attachment HTTP ${x.res.status}`);\n const bytes = await responseBytes(x.res);\n return { bytes, audit: await verify(\"qnet_official_session\", x.res.url || dl, bytes), resolved: { filePath, fileName, fileSeq } };\n}\n\nasync function acquire() {\n const attempts: any[] = [];\n for (const fn of [fetchStatic, fetchQNet]) {\n try {\n const got: any = await fn();\n attempts.push(got.audit);\n if (got.audit.exact) {\n const key = \"pb/2022-r59-natural-science-a/exact.pdf\";\n await blob.set(key, got.bytes);\n const provenance = {\n accepted_at: new Date().toISOString(), target: TARGET, accepted_from: got.audit.label,\n audit: got.audit, resolved: got.resolved ?? null, prior_attempts: attempts,\n };\n await blob.setJSON(\"pb/2022-r59-natural-science-a/provenance.json\", provenance);\n return { ok: true, key, provenance, bytes: got.bytes };\n }\n } catch (e) {\n attempts.push({ label: fn.name, error: String(e) });\n }\n }\n return { ok: false, attempts };\n}\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n if (url.searchParams.get(\"verify_stored\") === \"1\") {\n return Response.json({ ok: true, audit: await verifyStoredBlob() });\n }\n const result = await acquire();\n if (!result.ok) return Response.json({ ok: false, target: TARGET, attempts: result.attempts }, { status: 424 });\n if (url.searchParams.get(\"download\") === \"1\") {\n return new Response(result.bytes, {\n headers: {\n \"content-type\": \"application/pdf\",\n \"content-disposition\": `attachment; filename*=UTF-8''${encodeURIComponent(TARGET.filename)}`,\n \"x-pb-sha256\": TARGET.sha256,\n \"x-pb-bytes\": String(TARGET.bytes),\n },\n });\n }\n return Response.json({ ok: true, target: TARGET, provenance: result.provenance, download: `${url.origin}${url.pathname}?download=1` });\n}\n\n\nexport async function verifyStoredBlob() {\n const res = await blob.get(\"pb/2022-r59-natural-science-a/exact.pdf\");\n const bytes = new Uint8Array(await res.arrayBuffer());\n return await verify(\"valtown_blob_readback\", \"blob://pb/2022-r59-natural-science-a/exact.pdf\", bytes);\n}\n",[194],"8fae44de-9200-4f1e-b2f5-32749a9e8aea","contact_13_19.ts","575d6d5a-ae5a-11f1-bc68-1607ee4eb77e",20,["D",1789183846101],"import { blob } from \"https://esm.town/v/std/blob/main.ts\";\nimport { Jimp } from \"npm:jimp\";\nexport default async function(req:Request){\n const pages=[13,14,15,16,17,18,19];\n const thumbs:any[]=[];\n for(const p of pages){\n const res=await blob.get(`pb/2022-r59-natural-science-a/page-${String(p).padStart(2,\"0\")}.jpg`);\n const ab=await res.arrayBuffer(); const im=await Jimp.fromBuffer(ab); im.resize({w:360});\n thumbs.push(im);\n }\n const w=360*2, h=Math.max(...thumbs.map(x=>x.height))*4;\n const sheet=new Jimp({width:w,height:h,color:0xffffffff});\n let y=[0,0];\n for(let i=0;i

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