Initial commit: LAS Stream Viewer (Quarkus backend + React log-plot UI)

README.md

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+# LAS Stream Viewer
+
+Stream very large (10 GB+) LAS well-log files **line by line** in the browser. A Java 21 /
+Quarkus backend indexes and streams the file with a constant, tiny memory footprint; a React +
+Vite UI renders millions of lines via virtualization and plays them back as a live SSE stream.
+
+Built for the Pason-style LAS 2.0 logs in `Desktop\LAS files` (up to ~12.5 GB, 426 curves,
+~2.5 M rows). Nothing about the design assumes the file fits in memory.
+
+## Why it scales
+
+| Concern | Approach |
+|---|---|
+| Open a 12.5 GB file | **Open-in-place** (no copy) — or resumable chunked upload for remote files |
+| Random access into the file | One-pass **sparse byte-offset index** (a checkpoint every 256 lines ≈ 80 KB for 2.5 M lines) |
+| Indexing memory | Single streaming pass, 1 MiB buffer — independent of file size |
+| Streaming memory | One `BufferedReader` advanced sequentially; lines pushed over **SSE** with backpressure |
+| Browser memory | Virtualized list (only visible rows in the DOM) + a capped (20 K-line) LRU cache |
+| Reading a line range | Seek to nearest checkpoint, skip ≤ 255 lines — effectively O(1) |
+
+## Layout
+
+```
+las-stream-viewer/
+├─ pom.xml                      Quarkus 3.34.3, Java 21
+├─ run.ps1                      dev: Vite (:5173) + Quarkus (:8090)
+├─ build.ps1                    prod: bundle UI into the jar, serve on :8090
+├─ src/main/java/com/oiusa/las/
+│  ├─ model/                    LasFile, Curve, HeaderSection
+│  ├─ index/                    LineIndex (sparse offsets), LineReader (random access)
+│  ├─ service/                  FileStore, IndexService (one-pass scan), LasHeaderParser, UploadService
+│  └─ web/                      File / Lines / Stream(SSE) / Search(SSE) / Upload resources
+└─ frontend/                    React + Vite + TS, @tanstack/react-virtual
+```
+
+## Run (dev)
+
+```powershell
+cd C:\Users\Dell\Desktop\las-stream-viewer
+.\run.ps1
+```
+
+This installs UI deps on first run, starts Vite in a new window, and runs the Quarkus dev server.
+Open **http://localhost:5173**.
+
+To run the pieces by hand:
+
+```powershell
+# backend
+$env:JAVA_HOME="C:\Program Files\Java\jdk-21.0.11"
+$mvn = "C:\Users\Dell\.m2\wrapper\dists\apache-maven-3.9.9-bin\4nf9hui3q3djbarqar9g711ggc\apache-maven-3.9.9\bin\mvn.cmd"
+& $mvn quarkus:dev
+# frontend (separate window)
+cd frontend; npm install; npm run dev
+```
+
+## Run (production, single port)
+
+```powershell
+.\build.ps1
+$env:JAVA_HOME="C:\Program Files\Java\jdk-21.0.11"
+java -jar target\quarkus-app\quarkus-run.jar
+# open http://localhost:8090
+```
+
+## Using it
+
+1. **Open on disk** — browse the server filesystem (constrained to `las.allowed-roots`, default your
+   home dir) and click a `.las` file. It opens in place; indexing starts immediately and the header
+   appears as soon as it's parsed.
+2. **Upload** — drag a file in; it's streamed to the server in 16 MiB chunks.
+3. Watch the **LAS header** (version/well/curve metadata) populate in the sidebar.
+4. In the viewer: **▶ Stream** plays lines server-side over SSE (speed slider = lines/sec), scroll
+   freely through all lines (ranges fetched on demand), jump to **Top / Data / End** or any line,
+   and **Search** the whole file (streamed matches, click to jump).
+
+## Configuration (`src/main/resources/application.properties`)
+
+| Key | Default | Notes |
+|---|---|---|
+| `quarkus.http.port` | `8090` | API (and prod UI) port |
+| `las.data-dir` | `${user.home}/.las-stream-viewer` | where uploads live |
+| `las.allowed-roots` | `${user.home}` | local files may only be opened from under these roots |
+| `las.index-stride` | `256` | lines per index checkpoint (smaller = faster seeks, larger index) |
+| `las.upload-chunk-size` | `16777216` | upload chunk size hint (16 MiB) |
+```