commit 4404aa8f5dfec7cfa894413c889e09df664102b2 Author: Ignacio Rivero Date: Fri Feb 6 13:29:29 2026 -0300 New daemon architecture diff --git a/bleh/LICENSE b/bleh/LICENSE new file mode 100644 index 0000000..cf1d577 --- /dev/null +++ b/bleh/LICENSE @@ -0,0 +1,18 @@ +Bleh!: Go driver for Cat Thermal Printer MXW01 +Copyright (C) 2025 Ignacio Rivero + +This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. + +This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with this program. If not, see . + +See LICENSE.gplv3 for details. + +--- + +**Portions of this code are adapted from:** +CatPrinterBLE (C#), Copyright (c) 2025 MaikelChan +Distributed under the MIT License (see LICENSE.mit for details) +https://github.com/MaikelChan/CatPrinterBLE + \ No newline at end of file diff --git a/bleh/LICENSE.gplv3 b/bleh/LICENSE.gplv3 new file mode 100644 index 0000000..e72bfdd --- /dev/null +++ b/bleh/LICENSE.gplv3 @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. \ No newline at end of file diff --git a/bleh/LICENSE.mit b/bleh/LICENSE.mit new file mode 100644 index 0000000..0aeba95 --- /dev/null +++ b/bleh/LICENSE.mit @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2025 MaikelChan + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. \ No newline at end of file diff --git a/bleh/Makefile b/bleh/Makefile new file mode 100644 index 0000000..c19fa64 --- /dev/null +++ b/bleh/Makefile @@ -0,0 +1,104 @@ +PREFIX ?= /usr/local +BINDIR ?= $(PREFIX)/bin +SYSCONFDIR ?= /etc +DESTDIR ?= + +GO ?= go +GOFLAGS ?= + +BIN_DIR := bin +BLEH := $(BIN_DIR)/bleh +BLEHD := $(BIN_DIR)/blehd + +.PHONY: all build clean install uninstall setcap install-systemd uninstall-systemd install-openrc uninstall-openrc + +all: build + +build: + @mkdir -p $(BIN_DIR) + $(GO) build $(GOFLAGS) -o $(BLEH) ./cmd/bleh + $(GO) build $(GOFLAGS) -o $(BLEHD) ./cmd/blehd + +clean: + rm -rf $(BIN_DIR) + +# SETCAP: +# - auto (default): apply setcap when installing as root and setcap is available +# - 1: force setcap (fails if not root / setcap missing) +# - 0: never apply setcap +SETCAP ?= auto + +install: + @test -x $(BLEH) || (echo "Missing $(BLEH). Run: make build"; exit 1) + @test -x $(BLEHD) || (echo "Missing $(BLEHD). Run: make build"; exit 1) + install -Dm755 $(BLEH) $(DESTDIR)$(BINDIR)/bleh + install -Dm755 $(BLEHD) $(DESTDIR)$(BINDIR)/blehd + @case "$(SETCAP)" in \ + auto) \ + if [ "$$(id -u)" = "0" ] && command -v setcap >/dev/null 2>&1; then \ + echo "Applying capabilities to blehd (cap_net_raw,cap_net_admin)..."; \ + setcap cap_net_raw,cap_net_admin=eip $(DESTDIR)$(BINDIR)/blehd; \ + else \ + echo "(Skipping setcap: not root or setcap not found; run 'sudo make setcap' if needed)"; \ + fi \ + ;; \ + 1) \ + echo "Applying capabilities to blehd (cap_net_raw,cap_net_admin)..."; \ + setcap cap_net_raw,cap_net_admin=eip $(DESTDIR)$(BINDIR)/blehd \ + ;; \ + 0) \ + echo "(Skipping setcap: SETCAP=0)" \ + ;; \ + *) \ + echo "Unknown SETCAP=$(SETCAP) (use auto|1|0)"; exit 2 \ + ;; \ + esac + @if [ "$$(id -u)" = "0" ]; then \ + echo "Tip: to install a service: make install-systemd (or install-openrc)"; \ + fi + +uninstall: + rm -f $(DESTDIR)$(BINDIR)/bleh + rm -f $(DESTDIR)$(BINDIR)/blehd + +# Give blehd the minimum capabilities it needs so it can run unprivileged. +# (Still recommended to run it with a dedicated group for socket access.) +setcap: install + setcap cap_net_raw,cap_net_admin=eip $(DESTDIR)$(BINDIR)/blehd + +install-systemd: + install -Dm644 dist/systemd/blehd-root.service $(DESTDIR)$(SYSCONFDIR)/systemd/system/blehd.service + @echo "Installed root unit: $(SYSCONFDIR)/systemd/system/blehd.service" + @echo "" + @echo "Optional: create 'bleh' group for socket access:" + @echo " sudo groupadd -r bleh" + @echo " sudo usermod -aG bleh $$USER" + @echo " (then re-login)" + @echo "" + @echo "Now run:" + @echo " systemctl daemon-reload" + @echo " systemctl enable --now blehd.service" + +uninstall-systemd: + systemctl stop blehd.service 2>/dev/null || true + systemctl disable blehd.service 2>/dev/null || true + rm -f $(DESTDIR)$(SYSCONFDIR)/systemd/system/blehd.service + systemctl daemon-reload 2>/dev/null || true + @echo "Removed systemd service: $(SYSCONFDIR)/systemd/system/blehd.service" + +install-openrc: + install -Dm755 dist/openrc/blehd $(DESTDIR)$(SYSCONFDIR)/init.d/blehd + @echo "Installed OpenRC service: $(SYSCONFDIR)/init.d/blehd" + @echo "" + @echo "Optional: create 'bleh' group for socket access:" + @echo " sudo groupadd -r bleh" + @echo " sudo usermod -aG bleh $$USER" + @echo " (then re-login)" + @echo "" + @echo "Now run: rc-update add blehd default && rc-service blehd start" + +uninstall-openrc: + rc-service blehd stop 2>/dev/null || true + rc-update del blehd default 2>/dev/null || true + rm -f $(DESTDIR)$(SYSCONFDIR)/init.d/blehd + @echo "Removed OpenRC service: $(SYSCONFDIR)/init.d/blehd" diff --git a/bleh/README.md b/bleh/README.md new file mode 100644 index 0000000..597a6b2 --- /dev/null +++ b/bleh/README.md @@ -0,0 +1,96 @@ +# Bleh! + +

+ +

+ +**Bleh!** is a command-line utility to print images on the MXW01 Bluetooth thermal printer. +It supports 1-bit (1bpp) and 4-bit (4bpp) printing, various dithering algorithms, PNG preview output, and direct communication with the printer via BLE. + +## Features + +* Print PNG/JPG images (from file or stdin) in 1bpp or 4bpp mode +* Multiple dithering algorithms (Floyd-Steinberg, Bayer, Atkinson, etc.) +* Query printer status, battery, version, and more +* Output a PNG preview instead of printing (for integration or testing) +* Command-line interface with fine-grained options +* Works on Linux using BlueZ (via [go-ble/ble](https://github.com/go-ble/ble)) + +## Compiling + +On a Linux system: + +```sh +make build +``` + +(or `go build ./...` if you prefer) + +## Running (recommended: root daemon + unprivileged CLI) + +Start the daemon as root: + +```sh +sudo ./bin/blehd --socket /run/bleh/blehd.sock --group bleh +``` + +Then run the CLI as your normal user: + +```sh +./bin/bleh -s +./bin/bleh -i 100 ./image.png +``` + +The daemon restricts socket access via the `--group` flag. Add your user to that group: + +```sh +sudo groupadd -r bleh +sudo usermod -aG bleh $USER +# log out and back in +``` + +For a permanent setup, install the systemd service (see `dist/INSTALL.md`). + +## Usage + +```sh +bleh [options] +``` + +### Options + +| Option | Description | +| -------------------- | ----------------------------------------------------------------------------------- | +| `-i`, `--intensity` | Print intensity (0-100) (default: 80) | +| `-m`, `--mode` | Print mode: 1bpp or 4bpp (default: "1bpp") | +| `-d`, `--dither` | Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn | +| `-s`, `--status` | Query printer status | +| `-b`, `--battery` | Query battery level | +| `-v`, `--version` | Query printer version | +| `-p`, `--printtype` | Query print type | +| `-q`, `--querycount` | Query internal counter | +| `-E`, `--eject` | Eject paper by N lines | +| `-R`, `--retract` | Retract paper by N lines | +| `-o`, `--output` | Output PNG preview instead of printing. If value is "-", writes PNG to stdout. | +| `` | Path to PNG/JPG image to print, or "-" for stdin | + +### Example + +```sh +bleh -m 4bpp -d floyd ./myimage.png +``` + +## Requirements + +* Go 1.18+ +* BlueZ on Linux (for BLE support) +* Dependencies listed in `go.mod` (see source) + +## License + +This project is licensed under the terms of the GNU General Public License v3.0 or later. +Parts of the code were ported from [CatPrinterBLE](https://github.com/MaikelChan/CatPrinterBLE) and are licensed under the MIT License. +See the [`LICENSE`](./LICENSE) file for details. + +> **Disclaimer:** +> While a license was only added after the project’s initial commits, the current license applies retroactively to all previous commits of this repository. diff --git a/bleh/bin/blehd b/bleh/bin/blehd new file mode 100755 index 0000000..7a3017c Binary files /dev/null and b/bleh/bin/blehd differ diff --git a/bleh/bleh.jpg b/bleh/bleh.jpg new file mode 100644 index 0000000..e7eb4b4 Binary files /dev/null and b/bleh/bleh.jpg differ diff --git a/bleh/cmd/blehd/main.go b/bleh/cmd/blehd/main.go new file mode 100644 index 0000000..be43144 --- /dev/null +++ b/bleh/cmd/blehd/main.go @@ -0,0 +1,424 @@ +package main + +import ( + "bufio" + "context" + "encoding/base64" + "encoding/json" + "errors" + "flag" + "fmt" + "log" + "net" + "os" + "os/signal" + "path/filepath" + "strconv" + "sync" + "syscall" + "time" + + "bleh/internal/ipc" + "bleh/internal/mxw01" + + ble "github.com/go-ble/ble" + "github.com/go-ble/ble/linux" + "os/user" +) + +const ( + defaultSock = "/run/bleh/blehd.sock" +) + +func autoSocketPath(explicit string) (string, error) { + if explicit != "" { + return explicit, nil + } + if xdg := os.Getenv("XDG_RUNTIME_DIR"); xdg != "" { + return filepath.Join(xdg, "bleh", "blehd.sock"), nil + } + return defaultSock, nil +} + +var printerMu sync.Mutex + +func main() { + var socketPath string + var groupName string + flag.StringVar(&socketPath, "socket", "", "Unix socket path (default: auto-detect)") + flag.StringVar(&groupName, "group", "bleh", "Group name to own the socket") + flag.Parse() + + resolvedSock, err := autoSocketPath(socketPath) + if err != nil { + log.Fatalf("Failed to resolve socket path: %v", err) + } + socketPath = resolvedSock + + ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) + defer stop() + + // Init BLE device once. + d, err := linux.NewDevice() + if err != nil { + log.Printf("Failed to open BLE device: %v", err) + log.Printf("Hint: blehd needs CAP_NET_RAW and CAP_NET_ADMIN. Example:") + log.Printf(" sudo setcap cap_net_raw,cap_net_admin=eip $(which blehd)") + log.Fatalf("Exiting.") + } + ble.SetDefaultDevice(d) + + if err := os.MkdirAll(filepath.Dir(socketPath), 0o755); err != nil { + log.Fatalf("Failed to create socket dir: %v", err) + } + // Remove stale socket. + _ = os.Remove(socketPath) + + ln, err := net.Listen("unix", socketPath) + if err != nil { + log.Fatalf("Listen failed: %v", err) + } + defer ln.Close() + + // Set group ownership + perms. + if err := setSocketPerms(socketPath, groupName); err != nil { + log.Printf("Warning: failed to set socket permissions: %v", err) + log.Printf("Hint: if running unprivileged, prefer an XDG runtime socket (set $XDG_RUNTIME_DIR)") + } + + log.Printf("blehd listening on %s", socketPath) + + go func() { + <-ctx.Done() + _ = ln.Close() + _ = os.Remove(socketPath) + }() + + for { + c, err := ln.Accept() + if err != nil { + if errors.Is(err, net.ErrClosed) || ctx.Err() != nil { + return + } + log.Printf("accept error: %v", err) + continue + } + go handleConn(ctx, c) + } +} + +func setSocketPerms(path, group string) error { + grp, err := user.LookupGroup(group) + if err != nil { + return err + } + gid, err := strconv.Atoi(grp.Gid) + if err != nil { + return err + } + // Keep uid unchanged, set gid. + if err := os.Chown(path, -1, gid); err != nil { + return err + } + return os.Chmod(path, 0o660) +} + +func handleConn(ctx context.Context, c net.Conn) { + defer c.Close() + r := bufio.NewReader(c) + w := bufio.NewWriter(c) + defer w.Flush() + + for { + line, err := ipc.ReadLine(r) + if err != nil { + return + } + req, err := ipc.DecodeRequestLine(line) + if err != nil { + _ = ipc.EncodeLine(w, ipc.Response{OK: false, Error: &ipc.Error{Code: "EBADJSON", Message: err.Error()}}) + _ = w.Flush() + continue + } + + resp := dispatch(ctx, req) + _ = ipc.EncodeLine(w, resp) + _ = w.Flush() + } +} + +func dispatch(ctx context.Context, req *ipc.Request) ipc.Response { + if req.ID == "" { + req.ID = "-" + } + method := req.Method + + // Serialize access to the printer to avoid concurrent BLE sessions stomping each other. + // (This can be relaxed later if the printer/stack supports it reliably.) + printerMu.Lock() + defer printerMu.Unlock() + + switch method { + case "printer.status.get": + st, err := doQuery(ctx, req.Params, 0xA1) + if err != nil { + return fail(req.ID, err) + } + s, err := mxw01.DecodeStatusNotification(st) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, s) + + case "printer.battery.get": + b, err := doQuery(ctx, req.Params, 0xAB) + if err != nil { + return fail(req.ID, err) + } + pct, err := mxw01.DecodeBatteryNotification(b) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"battery": pct}) + + case "printer.version.get": + b, err := doQuery(ctx, req.Params, 0xB1) + if err != nil { + return fail(req.ID, err) + } + v, err := mxw01.DecodeVersionNotification(b) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, v) + + case "printer.printtype.get": + b, err := doQuery(ctx, req.Params, 0xB0) + if err != nil { + return fail(req.ID, err) + } + t, err := mxw01.DecodePrintTypeNotification(b) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"printType": t}) + + case "printer.querycount.get": + b, err := doQuery(ctx, req.Params, 0xA7) + if err != nil { + return fail(req.ID, err) + } + qc, err := mxw01.DecodeQueryCountNotification(b) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"queryCount": fmt.Sprintf("% X", qc)}) + + case "paper.eject": + lines, _ := getInt(req.Params, "lines") + err := doLineCommand(ctx, req.Params, 0xA3, uint(lines)) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"eject": lines}) + + case "paper.retract": + lines, _ := getInt(req.Params, "lines") + err := doLineCommand(ctx, req.Params, 0xA4, uint(lines)) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"retract": lines}) + + case "print.start": + err := doPrint(ctx, req.Params) + if err != nil { + return fail(req.ID, err) + } + return ok(req.ID, map[string]any{"printed": true}) + + default: + return ipc.Response{ID: req.ID, OK: false, Error: &ipc.Error{Code: "ENOIMPL", Message: "unknown method"}} + } +} + +func ok(id string, result any) ipc.Response { + return ipc.Response{ID: id, OK: true, Result: result} +} + +func fail(id string, err error) ipc.Response { + return ipc.Response{ID: id, OK: false, Error: &ipc.Error{Code: "EFAIL", Message: err.Error()}} +} + +func getString(m map[string]any, key string) (string, bool) { + v, ok := m[key] + if !ok { + return "", false + } + s, ok := v.(string) + return s, ok +} + +func getInt(m map[string]any, key string) (int, bool) { + v, ok := m[key] + if !ok { + return 0, false + } + switch t := v.(type) { + case float64: + return int(t), true + case int: + return t, true + case json.Number: + i, err := t.Int64() + return int(i), err == nil + default: + return 0, false + } +} + +func doQuery(ctx context.Context, params map[string]any, cmd byte) ([]byte, error) { + addr, _ := getString(params, "address") + + cctx, cancel := context.WithTimeout(ctx, 15*time.Second) + defer cancel() + + adv, err := mxw01.FindPrinter(cctx, addr) + if err != nil { + return nil, err + } + + client, err := ble.Dial(cctx, adv.Addr()) + if err != nil { + return nil, err + } + defer client.CancelConnection() + + mtu, err := client.ExchangeMTU(100) + if err == nil { + _ = mtu + } + + printChr, notifyChr, _, err := mxw01.DiscoverChars(client) + if err != nil { + return nil, err + } + if notifyChr == nil { + return nil, fmt.Errorf("missing notification characteristic") + } + + notifs := make(chan []byte, 8) + _, _ = client.DiscoverDescriptors(nil, notifyChr) + err = client.Subscribe(notifyChr, false, func(b []byte) { + select { + case notifs <- append([]byte{}, b...): + default: + } + }) + if err != nil { + return nil, err + } + + if err := mxw01.SendSimpleCommand(client, printChr, cmd); err != nil { + return nil, err + } + + deadline := time.NewTimer(2 * time.Second) + defer deadline.Stop() + for { + select { + case b := <-notifs: + c, _, perr := mxw01.ParseNotification(b) + if perr == nil && c == cmd { + return b, nil + } + case <-deadline.C: + return nil, fmt.Errorf("timeout waiting for notification 0x%02X", cmd) + case <-cctx.Done(): + return nil, cctx.Err() + } + } +} + +func doLineCommand(ctx context.Context, params map[string]any, cmd byte, lines uint) error { + addr, _ := getString(params, "address") + + cctx, cancel := context.WithTimeout(ctx, 15*time.Second) + defer cancel() + + adv, err := mxw01.FindPrinter(cctx, addr) + if err != nil { + return err + } + client, err := ble.Dial(cctx, adv.Addr()) + if err != nil { + return err + } + defer client.CancelConnection() + + printChr, _, _, err := mxw01.DiscoverChars(client) + if err != nil { + return err + } + return mxw01.SendLineCommand(client, printChr, cmd, lines) +} + +func doPrint(ctx context.Context, params map[string]any) error { + addr, _ := getString(params, "address") + modeStr, _ := getString(params, "mode") + intensity, _ := getInt(params, "intensity") + height, _ := getInt(params, "height") + pixelsB64, _ := getString(params, "pixels_b64") + + if height <= 0 { + return fmt.Errorf("invalid height") + } + pixels, err := base64.StdEncoding.DecodeString(pixelsB64) + if err != nil { + return fmt.Errorf("decode pixels: %v", err) + } + + pm := mxw01.Mode1bpp + switch modeStr { + case "1bpp": + pm = mxw01.Mode1bpp + case "4bpp": + pm = mxw01.Mode4bpp + default: + return fmt.Errorf("invalid mode") + } + if intensity < 0 { + intensity = 0 + } + if intensity > 100 { + intensity = 100 + } + + cctx, cancel := context.WithTimeout(ctx, 60*time.Second) + defer cancel() + + adv, err := mxw01.FindPrinter(cctx, addr) + if err != nil { + return err + } + client, err := ble.Dial(cctx, adv.Addr()) + if err != nil { + return err + } + defer client.CancelConnection() + + mtu, err := client.ExchangeMTU(100) + if err != nil { + mtu = 23 + } + + printChr, _, dataChr, err := mxw01.DiscoverChars(client) + if err != nil { + return err + } + if printChr == nil || dataChr == nil { + return fmt.Errorf("missing required characteristics") + } + + return mxw01.SendImageBufferToPrinter(client, dataChr, printChr, pixels, height, pm, byte(intensity), mtu) +} diff --git a/bleh/demo.jpg b/bleh/demo.jpg new file mode 100644 index 0000000..3859405 Binary files /dev/null and b/bleh/demo.jpg differ diff --git a/bleh/dist/INSTALL.md b/bleh/dist/INSTALL.md new file mode 100644 index 0000000..4ce1b8b --- /dev/null +++ b/bleh/dist/INSTALL.md @@ -0,0 +1,85 @@ +# bleh / blehd install notes + +## Recommended model + +- `bleh` is unprivileged. +- `blehd` runs as **root** (recommended). It owns the BLE device, and exposes a Unix socket for `bleh` to use. +- Access to that socket can be restricted with `--group` (recommended). + +## Build + +```sh +make build +``` + +## Install (system) + +```sh +sudo make install PREFIX=/usr/local +``` + +By default (`SETCAP=auto`), `make install` will apply capabilities to `blehd` when run as root. + +If you plan to run `blehd` as a **root system service** (recommended), you can skip capabilities: + +```sh +sudo make install SETCAP=0 +``` + +## Group access (optional) + +If you want group-based access to the socket: + +```sh +sudo groupadd -r bleh || true +sudo usermod -aG bleh $USER +# then re-login +``` + +Then run blehd with `--group bleh`. + +## systemd service (recommended) + +Install the unit: + +```sh +sudo make install-systemd +``` + +Enable it: + +```sh +sudo systemctl daemon-reload +sudo systemctl enable --now blehd.service +``` + +This will run `blehd` as root, listening on: + +- `/run/bleh/blehd.sock` + +To uninstall: + +```sh +sudo make uninstall-systemd +``` + +## OpenRC service + +Install the init script: + +```sh +sudo make install-openrc +``` + +Enable it: + +```sh +sudo rc-update add blehd default +sudo rc-service blehd start +``` + +To uninstall: + +```sh +sudo make uninstall-openrc +``` diff --git a/bleh/dist/openrc/blehd b/bleh/dist/openrc/blehd new file mode 100644 index 0000000..a4faa75 --- /dev/null +++ b/bleh/dist/openrc/blehd @@ -0,0 +1,17 @@ +#!/sbin/openrc-run + +name="blehd" +description="Bleh MXW01 privileged helper daemon" + +command="/usr/local/bin/blehd" +command_args="--socket /run/bleh/blehd.sock --group bleh" +command_background=true +pidfile="/run/${name}.pid" + +start_pre() { + checkpath -d -m 0755 /run/bleh +} + +depend() { + after bluetooth +} diff --git a/bleh/dist/systemd/blehd-root.service b/bleh/dist/systemd/blehd-root.service new file mode 100644 index 0000000..e200d79 --- /dev/null +++ b/bleh/dist/systemd/blehd-root.service @@ -0,0 +1,27 @@ +[Unit] +Description=Bleh MXW01 helper daemon (root) +After=network.target + +[Service] +Type=simple +ExecStart=/usr/local/bin/blehd --socket /run/bleh/blehd.sock --group bleh +Restart=on-failure +RestartSec=1 + +RuntimeDirectory=bleh +RuntimeDirectoryMode=0755 + +# Hardening (still useful even as root) +NoNewPrivileges=true +PrivateTmp=true +ProtectSystem=strict +ProtectHome=true +ProtectKernelTunables=true +ProtectKernelModules=true +ProtectControlGroups=true +RestrictSUIDSGID=true +LockPersonality=true +MemoryDenyWriteExecute=true + +[Install] +WantedBy=multi-user.target diff --git a/bleh/go.mod b/bleh/go.mod new file mode 100644 index 0000000..a130cf5 --- /dev/null +++ b/bleh/go.mod @@ -0,0 +1,19 @@ +module bleh + +go 1.22 + +require ( + github.com/disintegration/imaging v1.6.2 + github.com/go-ble/ble v0.0.0-20240122180141-8c5522f54333 + github.com/makeworld-the-better-one/dither v1.0.0 +) + +require ( + github.com/mattn/go-colorable v0.1.6 // indirect + github.com/mattn/go-isatty v0.0.12 // indirect + github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect + github.com/mgutz/logxi v0.0.0-20161027140823-aebf8a7d67ab // indirect + github.com/pkg/errors v0.8.1 // indirect + golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 // indirect + golang.org/x/sys v0.0.0-20211204120058-94396e421777 // indirect +) diff --git a/bleh/internal/imageproc/imageproc.go b/bleh/internal/imageproc/imageproc.go new file mode 100644 index 0000000..e7a4cc9 --- /dev/null +++ b/bleh/internal/imageproc/imageproc.go @@ -0,0 +1,189 @@ +package imageproc + +import ( + "fmt" + "image" + "image/color" + _ "image/gif" + _ "image/jpeg" + _ "image/png" + "io" + "os" + + "github.com/disintegration/imaging" + dither "github.com/makeworld-the-better-one/dither" + + "bleh/internal/mxw01" +) + +// DecodeImage loads an image from a given path or stdin ("-"). +func DecodeImage(path string) (image.Image, error) { + if path == "-" { + return DecodeImageFromReader(os.Stdin) + } + img, err := imaging.Open(path, imaging.AutoOrientation(true)) + if err != nil { + return nil, fmt.Errorf("failed to open image %q: %v", path, err) + } + return img, nil +} + +func DecodeImageFromReader(r io.Reader) (image.Image, error) { + img, _, err := image.Decode(r) + if err != nil { + return nil, fmt.Errorf("decode error: %v", err) + } + return img, nil +} + +func PadImageToMinLines(img image.Image, minLines int) image.Image { + bounds := img.Bounds() + if bounds.Dy() >= minLines { + return img + } + dst := imaging.New(bounds.Dx(), minLines, color.White) + dst = imaging.Paste(dst, img, image.Pt(0, 0)) + return dst +} + +func LoadImageMonoFromImage(img image.Image, ditherType string) ([]byte, int, error) { + b := img.Bounds() + if b.Dx() <= 0 || b.Dy() <= 0 { + return nil, 0, fmt.Errorf("invalid image bounds: %v", b) + } + ratio := float64(b.Dx()) / float64(b.Dy()) + height := int(float64(mxw01.LinePixels) / ratio) + if height <= 0 { + return nil, 0, fmt.Errorf("computed invalid height: %d", height) + } + + img = imaging.Resize(img, mxw01.LinePixels, height, imaging.Lanczos) + img = imaging.Grayscale(img) + + if ditherType != "none" { + palette := []color.Color{color.Black, color.White} + d := dither.NewDitherer(palette) + switch ditherType { + case "floyd": + d.Matrix = dither.FloydSteinberg + case "bayer2x2": + d.Mapper = dither.Bayer(2, 2, 1.0) + case "bayer4x4": + d.Mapper = dither.Bayer(4, 4, 1.0) + case "bayer8x8": + d.Mapper = dither.Bayer(8, 8, 1.0) + case "bayer16x16": + d.Mapper = dither.Bayer(16, 16, 1.0) + case "atkinson": + d.Matrix = dither.Atkinson + case "jjn": + d.Matrix = dither.JarvisJudiceNinke + default: + return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType) + } + img = d.DitherCopy(img) + } else { + img = imaging.AdjustContrast(img, 10) + } + + pixels := make([]byte, (mxw01.LinePixels*height)/8) + for y := 0; y < height; y++ { + for x := 0; x < mxw01.LinePixels; x++ { + gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray) + if gray.Y < 128 { + idx := (y*mxw01.LinePixels + x) / 8 + pixels[idx] |= 1 << (x % 8) + } + } + } + + return pixels, height, nil +} + +func LoadImage4BitFromImage(img image.Image, ditherType string) ([]byte, int, error) { + b := img.Bounds() + if b.Dx() <= 0 || b.Dy() <= 0 { + return nil, 0, fmt.Errorf("invalid image bounds: %v", b) + } + ratio := float64(b.Dx()) / float64(b.Dy()) + height := int(float64(mxw01.LinePixels) / ratio) + if height <= 0 { + return nil, 0, fmt.Errorf("computed invalid height: %d", height) + } + + img = imaging.Resize(img, mxw01.LinePixels, height, imaging.Lanczos) + img = imaging.Grayscale(img) + + palette := make([]color.Color, 16) + for i := 0; i < 16; i++ { + v := uint8(i * 17) + palette[i] = color.Gray{Y: 255 - v} + } + + if ditherType != "none" { + d := dither.NewDitherer(palette) + switch ditherType { + case "floyd": + d.Matrix = dither.FloydSteinberg + case "bayer2x2": + d.Mapper = dither.Bayer(2, 2, 0.2) + case "bayer4x4": + d.Mapper = dither.Bayer(4, 4, 0.2) + case "bayer8x8": + d.Mapper = dither.Bayer(8, 8, 0.2) + case "bayer16x16": + d.Mapper = dither.Bayer(16, 16, 0.2) + case "atkinson": + d.Matrix = dither.Atkinson + case "jjn": + d.Matrix = dither.JarvisJudiceNinke + default: + return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType) + } + img = d.DitherCopy(img) + } + + width := mxw01.LinePixels + pixels := make([]byte, (width*height)/2) + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray) + level := (255 - gray.Y) >> 4 + idx := (y*width + x) >> 1 + shift := uint(((x & 1) ^ 1) << 2) + pixels[idx] |= byte(level) << shift + } + } + + return pixels, height, nil +} + +func RenderPreviewFrom1bpp(pixels []byte, width, height int) image.Image { + img := image.NewGray(image.Rect(0, 0, width, height)) + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + idx := (y*width + x) / 8 + bit := uint(x % 8) + if pixels[idx]&(1<> 1 + shift := uint(((x & 1) ^ 1) << 2) + val := (pixels[idx] >> shift) & 0x0F + gray := 255 - val*17 + img.SetGray(x, y, color.Gray{Y: gray}) + } + } + return img +} diff --git a/bleh/internal/ipc/jsonl.go b/bleh/internal/ipc/jsonl.go new file mode 100644 index 0000000..5af0fc1 --- /dev/null +++ b/bleh/internal/ipc/jsonl.go @@ -0,0 +1,55 @@ +package ipc + +import ( + "bufio" + "bytes" + "encoding/json" + "fmt" + "io" +) + +const ( + // MaxLineBytes is the maximum size of a single JSON line accepted by the JSONL protocol. + // 1 MiB is enough for fairly large base64 pixel payloads while keeping memory bounded. + MaxLineBytes = 1 << 20 +) + +// ReadLine reads a single '\n'-terminated line from r with a hard size limit. +func ReadLine(r *bufio.Reader) ([]byte, error) { + var buf bytes.Buffer + for { + chunk, isPrefix, err := r.ReadLine() + if err != nil { + if err == io.EOF && buf.Len() > 0 { + return buf.Bytes(), nil + } + return nil, err + } + buf.Write(chunk) + if buf.Len() > MaxLineBytes { + return nil, fmt.Errorf("jsonl line too large (> %d bytes)", MaxLineBytes) + } + if !isPrefix { + break + } + } + return buf.Bytes(), nil +} + +func EncodeLine(w io.Writer, v any) error { + b, err := json.Marshal(v) + if err != nil { + return err + } + b = append(b, '\n') + _, err = w.Write(b) + return err +} + +func DecodeRequestLine(line []byte) (*Request, error) { + var req Request + if err := json.Unmarshal(line, &req); err != nil { + return nil, err + } + return &req, nil +} diff --git a/bleh/internal/ipc/protocol.go b/bleh/internal/ipc/protocol.go new file mode 100644 index 0000000..8d22cea --- /dev/null +++ b/bleh/internal/ipc/protocol.go @@ -0,0 +1,22 @@ +package ipc + +// JSONL request/response protocol shared by bleh and blehd. + +type Request struct { + ID string `json:"id"` + Method string `json:"method"` + Params map[string]any `json:"params,omitempty"` +} + +type Error struct { + Code string `json:"code"` + Message string `json:"message"` +} + +type Response struct { + ID string `json:"id,omitempty"` + OK bool `json:"ok"` + Result any `json:"result,omitempty"` + Error *Error `json:"error,omitempty"` + Event string `json:"event,omitempty"` +} diff --git a/bleh/internal/mxw01/mxw01.go b/bleh/internal/mxw01/mxw01.go new file mode 100644 index 0000000..f6b649f --- /dev/null +++ b/bleh/internal/mxw01/mxw01.go @@ -0,0 +1,282 @@ +package mxw01 + +import ( + "context" + "errors" + "fmt" + "time" + + ble "github.com/go-ble/ble" +) + +var ( + MainServiceUUID = ble.MustParse("ae30") + PrintCharacteristic = ble.MustParse("ae01") + NotifyCharacteristic = ble.MustParse("ae02") + DatCharacteristic = ble.MustParse("ae03") + TargetPrinterName = "MXW01" + ScanTimeout = 10 * time.Second + PrintCommandHeader = []byte{0x22, 0x21} + PrintCommandFooter = byte(0xFF) +) + +type PrintMode byte + +const ( + Mode1bpp PrintMode = 0x00 + Mode4bpp PrintMode = 0x02 +) + +const ( + LinePixels = 384 + MinLines = 86 // firmware refuses to print anything shorter + DefaultSleep = 6 * time.Millisecond +) + +type Status struct { + OK bool `json:"ok"` + State string `json:"state"` + BatteryPct int `json:"battery"` + TempC int `json:"temp"` +} + +type Version struct { + Version string `json:"version"` + PrintType string `json:"printType"` +} + +func FindPrinter(ctx context.Context, address string) (ble.Advertisement, error) { + var addr ble.Addr + var adv ble.Advertisement + + if address != "" { + addr = ble.NewAddr(address) + } + + ctxScan, cancel := context.WithTimeout(ctx, ScanTimeout) + defer cancel() + + err := ble.Scan(ctxScan, false, func(a ble.Advertisement) { + if address != "" { + if a.Addr().String() == addr.String() { + adv = a + cancel() + } + return + } + if a.LocalName() == TargetPrinterName { + adv = a + cancel() + } + }, nil) + if err != nil && !errors.Is(err, context.Canceled) { + return nil, fmt.Errorf("scan error: %w", err) + } + if adv == nil { + return nil, fmt.Errorf("printer not found") + } + return adv, nil +} + +func DiscoverChars(client ble.Client) (printChr, notifyChr, dataChr *ble.Characteristic, err error) { + services, err := client.DiscoverServices([]ble.UUID{MainServiceUUID}) + if err != nil || len(services) == 0 { + return nil, nil, nil, fmt.Errorf("service discovery failed: %v", err) + } + svc := services[0] + chars, err := client.DiscoverCharacteristics(nil, svc) + if err != nil { + return nil, nil, nil, fmt.Errorf("characteristic discovery failed: %v", err) + } + for _, c := range chars { + switch c.UUID.String() { + case PrintCharacteristic.String(): + printChr = c + case NotifyCharacteristic.String(): + notifyChr = c + case DatCharacteristic.String(): + dataChr = c + } + } + return printChr, notifyChr, dataChr, nil +} + +func BuildCommand(cmdId byte, payload []byte) []byte { + cmd := append([]byte{}, PrintCommandHeader...) + cmd = append(cmd, cmdId) + cmd = append(cmd, 0x00) // reserved + cmd = append(cmd, byte(len(payload)&0xFF), byte(len(payload)>>8)) + cmd = append(cmd, payload...) + cmd = append(cmd, CalculateCRC8(payload)) + cmd = append(cmd, PrintCommandFooter) + return cmd +} + +func SendSimpleCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte) error { + cmd := BuildCommand(cmdId, []byte{0x00}) + return client.WriteCharacteristic(printChr, cmd, true) +} + +func SendLineCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte, lines uint) error { + param := []byte{byte(lines & 0xFF), byte(lines >> 8)} + cmd := BuildCommand(cmdId, param) + return client.WriteCharacteristic(printChr, cmd, true) +} + +func ParseNotification(data []byte) (cmd byte, payloadLen int, err error) { + if len(data) < 6 { + return 0, 0, fmt.Errorf("malformed notification (too short)") + } + if data[0] != 0x22 || data[1] != 0x21 { + return 0, 0, fmt.Errorf("invalid notification header") + } + cmd = data[2] + payloadLen = int(data[4]) | int(data[5])<<8 + return cmd, payloadLen, nil +} + +func DecodeStatusNotification(data []byte) (*Status, error) { + _, _, err := ParseNotification(data) + if err != nil { + return nil, err + } + if len(data) < 14 { + return nil, fmt.Errorf("malformed status notification") + } + battery := int(data[9]) + temp := int(data[10]) + statusOk := data[12] == 0 + statusCode := data[6] + errCode := data[13] + + statusMsg := "Unknown" + if statusOk { + switch statusCode { + case 0x0: + statusMsg = "Standby" + case 0x1: + statusMsg = "Printing" + case 0x2: + statusMsg = "Feeding paper" + case 0x3: + statusMsg = "Ejecting paper" + } + } else { + switch errCode { + case 0x1, 0x9: + statusMsg = "No paper" + case 0x4: + statusMsg = "Overheated" + case 0x8: + statusMsg = "Low battery" + } + } + + return &Status{OK: statusOk, State: statusMsg, BatteryPct: battery, TempC: temp}, nil +} + +func DecodeBatteryNotification(data []byte) (int, error) { + _, _, err := ParseNotification(data) + if err != nil { + return 0, err + } + if len(data) < 7 { + return 0, fmt.Errorf("malformed battery notification") + } + return int(data[6]), nil +} + +func DecodePrintTypeNotification(data []byte) (string, error) { + _, _, err := ParseNotification(data) + if err != nil { + return "", err + } + if len(data) < 7 { + return "", fmt.Errorf("malformed printtype notification") + } + switch data[6] { + case 0x01: + return "High pressure", nil + case 0xFF: + return "Unknown", nil + default: + return "Low pressure", nil + } +} + +func DecodeVersionNotification(data []byte) (*Version, error) { + _, dataLen, err := ParseNotification(data) + if err != nil { + return nil, err + } + if len(data) < 15 { + return nil, fmt.Errorf("malformed version notification (too short)") + } + if len(data) < 14+dataLen { + return nil, fmt.Errorf("malformed version notification") + } + ver := string(data[6 : 6+dataLen]) + pt := "Unknown" + switch data[14] { + case 0x32: + pt = "High pressure" + case 0x31: + pt = "Low pressure" + } + return &Version{Version: ver, PrintType: pt}, nil +} + +func DecodeQueryCountNotification(data []byte) ([]byte, error) { + _, _, err := ParseNotification(data) + if err != nil { + return nil, err + } + if len(data) < 12 { + return nil, fmt.Errorf("malformed querycount notification") + } + out := make([]byte, 6) + copy(out, data[6:12]) + return out, nil +} + +func CalculateCRC8(data []byte) byte { + table := [256]byte{ + 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, + 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, + 0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, + 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d, + 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, + 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, + 0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, + 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd, + 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, + 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, + 0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, + 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a, + 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, + 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a, + 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, + 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, + 0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, + 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4, + 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, + 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4, + 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, + 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, + 0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, + 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34, + 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, + 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63, + 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, + 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, + 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, + 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83, + 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, + 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3, + } + crc := byte(0) + for _, b := range data { + crc = table[crc^b] + } + return crc +} diff --git a/bleh/internal/mxw01/print.go b/bleh/internal/mxw01/print.go new file mode 100644 index 0000000..5ed7251 --- /dev/null +++ b/bleh/internal/mxw01/print.go @@ -0,0 +1,56 @@ +package mxw01 + +import ( + "fmt" + "time" + + ble "github.com/go-ble/ble" +) + +func SendImageBufferToPrinter(client ble.Client, dataChr, printChr *ble.Characteristic, pixels []byte, height int, mode PrintMode, intensity byte, attMTU int) error { + cmd := BuildCommand(0xA2, []byte{intensity}) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("intensity set failed: %v", err) + } + + param := []byte{byte(height & 0xFF), byte(height >> 8), 0x30, byte(mode)} + cmd = BuildCommand(0xA9, param) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("print command failed: %v", err) + } + + bytesPerLine := LinePixels / 8 + if mode == Mode4bpp { + bytesPerLine = LinePixels / 2 + } + + // ATT_MTU includes 3 bytes of ATT overhead for Write Command/Request. + payloadMTU := 20 + if attMTU > 3 { + payloadMTU = attMTU - 3 + } + if payloadMTU < 1 { + payloadMTU = 1 + } + + for y := 0; y < height; y++ { + slice := pixels[y*bytesPerLine : (y+1)*bytesPerLine] + for offset := 0; offset < len(slice); offset += payloadMTU { + end := offset + payloadMTU + if end > len(slice) { + end = len(slice) + } + chunk := slice[offset:end] + if err := client.WriteCharacteristic(dataChr, chunk, true); err != nil { + return fmt.Errorf("line %d chunk write failed: %v", y, err) + } + time.Sleep(DefaultSleep) + } + } + + cmd = BuildCommand(0xAD, []byte{0x00}) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("flush failed: %v", err) + } + return nil +} diff --git a/bleh/main.go b/bleh/main.go new file mode 100644 index 0000000..6e35994 --- /dev/null +++ b/bleh/main.go @@ -0,0 +1,845 @@ +/* +This file is part of Bleh!. + +Bleh! is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. + +Bleh! is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with Foobar. If not, see . +*/ + +//go:build ignore + +package main + +import ( + "context" + "flag" + "fmt" + "image" + "image/color" + _ "image/gif" + _ "image/jpeg" + _ "image/png" + "io" + "log" + "os" + "os/signal" + "time" + + "github.com/disintegration/imaging" + ble "github.com/go-ble/ble" + "github.com/go-ble/ble/linux" + dither "github.com/makeworld-the-better-one/dither" +) + +const minLines = 86 // firmware refuses to print anything shorter + +var ( + mainServiceUUID = ble.MustParse("ae30") + printCharacteristic = ble.MustParse("ae01") + notifyCharacteristic = ble.MustParse("ae02") + dataCharacteristic = ble.MustParse("ae03") + targetPrinterName = "MXW01" + scanTimeout = 10 * time.Second + reconnectDelay = 250 * time.Millisecond + printCommandHeader = []byte{0x22, 0x21} + printCommandFooter = byte(0xFF) + intensity int + mode string + ditherType string + getStatus bool + getBattery bool + getVersion bool + getPrintType bool + getQueryCount bool + ejectPaper uint + retractPaper uint + outputPath string + address string + version = "dev" +) + +func init() { + flag.IntVar(&intensity, "intensity", 80, "Print intensity (0-100)") + flag.IntVar(&intensity, "i", 80, "Print intensity (0-100)") + + flag.StringVar(&mode, "mode", "1bpp", "Print mode: 1bpp or 4bpp") + flag.StringVar(&mode, "m", "1bpp", "Print mode: 1bpp or 4bpp") + + flag.StringVar(&ditherType, "dither", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn") + flag.StringVar(&ditherType, "d", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn") + + flag.BoolVar(&getStatus, "status", false, "Query printer status") + flag.BoolVar(&getStatus, "s", false, "Query printer status") + + flag.BoolVar(&getBattery, "battery", false, "Query battery level") + flag.BoolVar(&getBattery, "b", false, "Query battery level") + + flag.BoolVar(&getVersion, "version", false, "Query printer version") + flag.BoolVar(&getVersion, "v", false, "Query printer version") + + flag.BoolVar(&getPrintType, "printtype", false, "Query print type") + flag.BoolVar(&getPrintType, "p", false, "Query print type") + + flag.BoolVar(&getQueryCount, "querycount", false, "Query internal counter") + flag.BoolVar(&getQueryCount, "q", false, "Query internal counter") + + flag.UintVar(&ejectPaper, "eject", 0, "Eject paper by N lines") + flag.UintVar(&ejectPaper, "E", 0, "Eject paper by N lines") + + flag.UintVar(&retractPaper, "retract", 0, "Retract paper by N lines") + flag.UintVar(&retractPaper, "R", 0, "Retract paper by N lines") + + flag.StringVar(&outputPath, "o", "", "Output PNG preview instead of printing (specify output path)") + flag.StringVar(&outputPath, "output", "", "Output PNG preview instead of printing (specify output path)") + + flag.StringVar(&address, "a", "", "Connect to printer by MAC address") + flag.StringVar(&address, "address", "", "Connect to printer by MAC address") + + flag.Usage = func() { + fmt.Fprintf(os.Stderr, "Bleh! Cat Printer Utility for MXW01, version %s\n", version) + fmt.Fprintf(os.Stderr, "Usage: %s [options] \n", os.Args[0]) + fmt.Fprintln(os.Stderr, ` +Options: + -h, --help Show this help message + -a, --address Connect to printer by MAC address + -i, --intensity int Print intensity (0-100) (default 80) + -m, --mode string Print mode: 1bpp or 4bpp (default "1bpp") + -d, --dither string Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn (default "none") + -s, --status Query printer status + -b, --battery Query battery level + -v, --version Query printer version + -p, --printtype Query print type + -q, --querycount Query internal counter + -E, --eject uint Eject paper by N lines + -R, --retract uint Retract paper by N lines + -o, --output Output PNG preview instead of printing. + If is "-", writes PNG to stdout. + Path to PNG/JPG to print, or '-' for stdin`) + } +} + +func parseNotification(data []byte) { + // Minimum frame size for header + cmd + reserved + len (2 bytes) + if len(data) < 6 { + fmt.Printf("Malformed notification (too short), raw: % X\n", data) + return + } + if data[0] != 0x22 || data[1] != 0x21 { + fmt.Printf("Invalid notification header, raw: % X\n", data) + return + } + + cmd := data[2] + dataLen := int(data[4]) | int(data[5])<<8 + + switch cmd { + case 0xA1: // GetStatus + if len(data) < 14 { + fmt.Printf("Malformed status notification, raw: % X\n", data) + return + } + battery := data[9] + temp := data[10] + statusOk := data[12] == 0 + statusCode := data[6] + errCode := data[13] + + statusMsg := "Unknown" + if statusOk { + switch statusCode { + case 0x0: + statusMsg = "Standby" + case 0x1: + statusMsg = "Printing" + case 0x2: + statusMsg = "Feeding paper" + case 0x3: + statusMsg = "Ejecting paper" + } + } else { + switch errCode { + case 0x1, 0x9: + statusMsg = "No paper" + case 0x4: + statusMsg = "Overheated" + case 0x8: + statusMsg = "Low battery" + } + } + + fmt.Printf("Status: %v (%s), Battery: %d, Temp: %d\n", statusOk, statusMsg, battery, temp) + + case 0xA3: // EjectPaper + fmt.Println("Ejecting paper...") + + case 0xA4: // RetractPaper + fmt.Println("Retracting paper...") + + case 0xA7: // QueryCount + if len(data) < 12 { + fmt.Printf("Malformed querycount notification, raw: % X\n", data) + return + } + fmt.Printf("Query count: % X\n", data[6:12]) + + case 0xA9: // Print + printOk := data[6] == 0 + fmt.Printf("Print status: %s\n", map[bool]string{true: "Ok", false: "Failure"}[printOk]) + + case 0xAA: // PrintComplete + fmt.Println("Printing finished.") + + case 0xAB: // BatteryLevel + if len(data) < 7 { + fmt.Printf("Malformed battery notification, raw: % X\n", data) + return + } + fmt.Printf("Battery level: %d\n", data[6]) + + case 0xB0: // GetPrintType + if len(data) < 7 { + fmt.Printf("Malformed printtype notification, raw: % X\n", data) + return + } + var t string + switch data[6] { + case 0x01: + t = `High pressure` + case 0xFF: + t = `"Unknown` + default: + t = `Low pressure` + } + fmt.Printf("Print type: %s\n", t) + + case 0xB1: // GetVersion + // Needs at least header(2)+cmd/res/len(4)+payload(dataLen)+... (we also read data[14]) + if len(data) < 15 { + fmt.Printf("Malformed version notification (too short), raw: % X\n", data) + return + } + if len(data) < 6+dataLen { + fmt.Printf("Malformed version notification (bad length), raw: % X\n", data) + return + } + if len(data) < 14+dataLen { + fmt.Printf("Malformed version notification, raw: % X\n", data) + return + } + version := string(data[6 : 6+dataLen]) + var t string + switch data[14] { + case 0x32: + t = `High pressure` + case 0x31: + t = `Low pressure` + default: + t = `Unknown` + } + fmt.Printf("Version: %s, Print type: %s\n", version, t) + + default: + fmt.Printf("Received notification for unknown command: 0x%02X\n", cmd) + } +} + +const ( + linePixels = 384 + bytesPerLine = linePixels / 8 +) + +// decodeImage loads an image from a given path or stdin ("-") +func decodeImage(path string) (image.Image, error) { + if path == "-" { + return decodeImageFromReader(os.Stdin) + } + img, err := imaging.Open(path, imaging.AutoOrientation(true)) + if err != nil { + return nil, fmt.Errorf("failed to open image %q: %v", path, err) + } + return img, nil +} + +// decodeImageFromReader reads and decodes an image from any io.Reader +func decodeImageFromReader(r io.Reader) (image.Image, error) { + img, _, err := image.Decode(r) + if err != nil { + return nil, fmt.Errorf("decode error: %v", err) + } + return img, nil +} + +// loadImageMonoFromImage processes an image.Image to 1bpp packed byte format +func loadImageMonoFromImage(img image.Image, ditherType string) ([]byte, int, error) { + b := img.Bounds() + if b.Dx() <= 0 || b.Dy() <= 0 { + return nil, 0, fmt.Errorf("invalid image bounds: %v", b) + } + ratio := float64(b.Dx()) / float64(b.Dy()) + height := int(float64(linePixels) / ratio) + if height <= 0 { + return nil, 0, fmt.Errorf("computed invalid height: %d", height) + } + img = imaging.Resize(img, linePixels, height, imaging.Lanczos) + img = imaging.Grayscale(img) + + if ditherType != "none" { + palette := []color.Color{color.Black, color.White} + d := dither.NewDitherer(palette) + switch ditherType { + case "floyd": + d.Matrix = dither.FloydSteinberg + case "bayer2x2": + d.Mapper = dither.Bayer(2, 2, 1.0) + case "bayer4x4": + d.Mapper = dither.Bayer(4, 4, 1.0) + case "bayer8x8": + d.Mapper = dither.Bayer(8, 8, 1.0) + case "bayer16x16": + d.Mapper = dither.Bayer(16, 16, 1.0) + case "atkinson": + d.Matrix = dither.Atkinson + case "jjn": + d.Matrix = dither.JarvisJudiceNinke + default: + return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType) + } + img = d.DitherCopy(img) + } else { + img = imaging.AdjustContrast(img, 10) + } + + pixels := make([]byte, (linePixels*height)/8) + for y := 0; y < height; y++ { + for x := 0; x < linePixels; x++ { + gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray) + if gray.Y < 128 { + idx := (y*linePixels + x) / 8 + pixels[idx] |= 1 << (x % 8) + } + } + } + + return pixels, height, nil +} + +// loadImage4BitFromImage processes an image.Image to 4bpp packed byte format +func loadImage4BitFromImage(img image.Image, ditherType string) ([]byte, int, error) { + b := img.Bounds() + if b.Dx() <= 0 || b.Dy() <= 0 { + return nil, 0, fmt.Errorf("invalid image bounds: %v", b) + } + ratio := float64(b.Dx()) / float64(b.Dy()) + height := int(float64(linePixels) / ratio) + if height <= 0 { + return nil, 0, fmt.Errorf("computed invalid height: %d", height) + } + img = imaging.Resize(img, linePixels, height, imaging.Lanczos) + img = imaging.Grayscale(img) + + palette := make([]color.Color, 16) + for i := 0; i < 16; i++ { + v := uint8(i * 17) + palette[i] = color.Gray{Y: 255 - v} + } + + if ditherType != "none" { + d := dither.NewDitherer(palette) + switch ditherType { + case "floyd": + d.Matrix = dither.FloydSteinberg + case "bayer2x2": + d.Mapper = dither.Bayer(2, 2, 0.2) + case "bayer4x4": + d.Mapper = dither.Bayer(4, 4, 0.2) + case "bayer8x8": + d.Mapper = dither.Bayer(8, 8, 0.2) + case "bayer16x16": + d.Mapper = dither.Bayer(16, 16, 0.2) + case "atkinson": + d.Matrix = dither.Atkinson + case "jjn": + d.Matrix = dither.JarvisJudiceNinke + default: + return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType) + } + img = d.DitherCopy(img) + } + + width := linePixels + pixels := make([]byte, (width*height)/2) + + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray) + level := (255 - gray.Y) >> 4 // 0..15, inverted logic + idx := (y*width + x) >> 1 + shift := uint(((x & 1) ^ 1) << 2) + pixels[idx] |= level << shift + } + } + return pixels, height, nil +} + +// Extend sendImageToPrinter to handle 4-bit mode +type PrintMode byte + +const ( + Mode1bpp PrintMode = 0x00 + Mode4bpp PrintMode = 0x02 +) + +func sendImageBufferToPrinter(client ble.Client, dataChr, printChr *ble.Characteristic, pixels []byte, height int, mode PrintMode, intensity byte, attMTU int) error { + fmt.Printf("Sending image: %dx%d lines\n", linePixels, height) + + cmd := buildCommand(0xA2, []byte{intensity}) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("intensity set failed: %v", err) + } + + param := []byte{ + byte(height & 0xFF), byte(height >> 8), + 0x30, + byte(mode), + } + cmd = buildCommand(0xA9, param) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("print command failed: %v", err) + } + + bytesPerLine := linePixels / 8 + if mode == Mode4bpp { + bytesPerLine = linePixels / 2 + } + + // ATT_MTU includes 3 bytes of ATT overhead for Write Command/Request. + payloadMTU := 20 + if attMTU > 3 { + payloadMTU = attMTU - 3 + } + if payloadMTU < 1 { + payloadMTU = 1 + } + + for y := 0; y < height; y++ { + slice := pixels[y*bytesPerLine : (y+1)*bytesPerLine] + for offset := 0; offset < len(slice); offset += payloadMTU { + end := offset + payloadMTU + if end > len(slice) { + end = len(slice) + } + chunk := slice[offset:end] + if err := client.WriteCharacteristic(dataChr, chunk, true); err != nil { + return fmt.Errorf("line %d chunk write failed: %v", y, err) + } + time.Sleep(6 * time.Millisecond) + } + } + + cmd = buildCommand(0xAD, []byte{0x00}) + if err := client.WriteCharacteristic(printChr, cmd, true); err != nil { + return fmt.Errorf("flush failed: %v", err) + } + + return nil +} + +func padImageToMinLines(img image.Image, minLines int) image.Image { + bounds := img.Bounds() + if bounds.Dy() >= minLines { + return img + } + // Create a new white image + dst := imaging.New(bounds.Dx(), minLines, color.White) + // Paste the original image at the top + dst = imaging.Paste(dst, img, image.Pt(0, 0)) + return dst +} + +func sendSimpleCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte) error { + cmd := buildCommand(cmdId, []byte{0x00}) + return client.WriteCharacteristic(printChr, cmd, true) +} + +func sendLineCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte, lines uint) error { + param := []byte{byte(lines & 0xFF), byte(lines >> 8)} + cmd := buildCommand(cmdId, param) + return client.WriteCharacteristic(printChr, cmd, true) +} + +func renderPreviewFrom1bpp(pixels []byte, width, height int) image.Image { + img := image.NewGray(image.Rect(0, 0, width, height)) + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + idx := (y*width + x) / 8 + bit := uint(x % 8) + if pixels[idx]&(1<> 1 + shift := uint(((x & 1) ^ 1) << 2) + val := (pixels[idx] >> shift) & 0x0F + gray := 255 - val*17 + img.SetGray(x, y, color.Gray{Y: gray}) + } + } + return img +} + +func findPrinter(ctx context.Context) (ble.Advertisement, error) { + var addr ble.Addr + var adv ble.Advertisement + + if address != "" { + log.Printf("Connecting directly to MAC address: %s", address) + addr = ble.NewAddr(address) + fmt.Printf("Using address: %s\n", addr) + } + + ctxScan, cancel := context.WithTimeout(ctx, scanTimeout) + log.Println("Scanning for printer...") + err := ble.Scan(ctxScan, false, func(a ble.Advertisement) { + if address != "" { + if a.Addr().String() == addr.String() { // Wonder why this works and not direct comparison + adv = a + cancel() + } + } else if a.LocalName() == targetPrinterName { + adv = a + cancel() + } + }, nil) + if err != nil && err != context.Canceled { + return nil, fmt.Errorf("scan error, %v", err) + } + if adv == nil { + return nil, fmt.Errorf("printer not found") + } + log.Println("Found target printer with address:", adv.Addr().String()) + return adv, nil +} + +func discoverChars(client ble.Client) (*ble.Characteristic, *ble.Characteristic, *ble.Characteristic, error) { + var printChr, notifyChr, dataChr *ble.Characteristic + services, err := client.DiscoverServices([]ble.UUID{mainServiceUUID}) + if err != nil || len(services) == 0 { + return nil, nil, nil, fmt.Errorf("service discovery failed: %v", err) + } + svc := services[0] + chars, err := client.DiscoverCharacteristics(nil, svc) + if err != nil { + return nil, nil, nil, fmt.Errorf("characteristic discovery failed: %v", err) + } + for _, c := range chars { + switch c.UUID.String() { + case printCharacteristic.String(): + printChr = c + case notifyCharacteristic.String(): + notifyChr = c + case dataCharacteristic.String(): + dataChr = c + } + } + return printChr, notifyChr, dataChr, nil +} + +func subToNotifs(client ble.Client, notifyChr *ble.Characteristic) error { + if notifyChr != nil { + _, _ = client.DiscoverDescriptors(nil, notifyChr) + err := client.Subscribe(notifyChr, false, func(b []byte) { + parseNotification(b) + }) + if err != nil { + return fmt.Errorf("%v", err) + } else { + log.Println("Subscribed to printer notifications.") + } + } else { + return fmt.Errorf("missing notification characteristic") + } + return nil +} + +func loadAndProcessImage(imagePath string, printMode PrintMode, ditherType string) ([]byte, int, error) { + img, err := decodeImage(imagePath) + if err != nil { + return nil, 0, fmt.Errorf("image load error: %v", err) + } + img = padImageToMinLines(img, minLines) + var pixels []byte + var height int + + // Convert image to the desired format + switch printMode { + case Mode1bpp: + pixels, height, err = loadImageMonoFromImage(img, ditherType) + case Mode4bpp: + pixels, height, err = loadImage4BitFromImage(img, ditherType) + } + if err != nil { + return nil, 0, fmt.Errorf("image conversion error: %v", err) + } + + return pixels, height, nil +} + +func loadPrinter(ctx context.Context) (ble.Client, *ble.Characteristic, *ble.Characteristic, *ble.Characteristic, int, error) { + // Find printer + adv, err := findPrinter(ctx) + if err != nil { + return nil, nil, nil, nil, 0, fmt.Errorf("failed to find printer: %v", err) + } + + // Connect to printer + log.Println("Connecting...") + client, err := ble.Dial(ctx, adv.Addr()) + if err != nil { + return nil, nil, nil, nil, 0, fmt.Errorf("connect failed: %v", err) + } + + // Negotiate large MTU if possible + mtu, err := client.ExchangeMTU(100) + if err != nil { + log.Printf("MTU negotiation failed: %v", err) + mtu = 23 // default ATT MTU + } else { + log.Printf("Negotiated ATT MTU: %d", mtu) + } + + // Discover services and characteristics + printChr, notifyChr, dataChr, err := discoverChars(client) + if err != nil { + client.CancelConnection() + return nil, nil, nil, nil, 0, fmt.Errorf("characteristic discovery failed: %v", err) + } + + return client, printChr, notifyChr, dataChr, mtu, nil +} + +func main() { + flag.Parse() + + if outputPath != "-" { + log.Println("Bleh! Cat Printer Utility for MXW01, version", version) + } + + needNotifications := getStatus || getBattery || getVersion || getPrintType || getQueryCount || ejectPaper > 0 || retractPaper > 0 + + needPrinter := needNotifications || (flag.NArg() > 0 && outputPath == "") + + if !needPrinter && outputPath == "" { + log.Println("Nothing to do. Use -h for help.") + log.Println("Done!") + return + } + + // Get print mode + var printMode PrintMode + switch mode { + case "1bpp": + printMode = Mode1bpp + case "4bpp": + printMode = Mode4bpp + default: + fmt.Println("Invalid mode. Use '1bpp' or '4bpp'.") + return + } + + // Get image path + imagePath := flag.Arg(0) + + pixels, height, err := []byte(nil), int(0), error(nil) + + if imagePath != "" { + pixels, height, err = loadAndProcessImage(imagePath, printMode, ditherType) + if err != nil { + log.Fatalf("Failed to load and process image: %v", err) + } + } + + if outputPath != "" { + var previewImg image.Image + switch printMode { + case Mode1bpp: + previewImg = renderPreviewFrom1bpp(pixels, linePixels, height) + case Mode4bpp: + previewImg = renderPreviewFrom4bpp(pixels, linePixels, height) + } + var out io.Writer + if outputPath == "-" { + out = os.Stdout + } else { + f, err := os.Create(outputPath) + if err != nil { + log.Fatalf("Failed to create output file: %v", err) + } + defer f.Close() + out = f + } + err = imaging.Encode(out, previewImg, imaging.PNG) + if err != nil { + log.Fatalf("Failed to write PNG preview: %v", err) + } + if outputPath != "-" { + log.Printf("Preview PNG written to %s\n", outputPath) + } + return + } + + ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt) + defer stop() + + if needPrinter { + // Initialize BLE device once. Re-initializing can fail with "device busy" on some stacks. + d, err := linux.NewDevice() + if err != nil { + log.Fatalf("Failed to open BLE device: %v", err) + } + ble.SetDefaultDevice(d) + + // Phase 1: query/eject/retract + if needNotifications { + client, printChr, notifyChr, _, _, err := loadPrinter(ctx) + if err != nil { + log.Fatalf("Failed to load printer: %v", err) + } + + // Subscribe to notifications + err = subToNotifs(client, notifyChr) + if err != nil { + client.CancelConnection() + log.Fatalf("Failed to subscribe to notifications: %v", err) + } + + // TODO: check if the firmware allows more than one command at a time. + // For now we run query commands, disconnect, then reconnect for printing. + sendOrLog := func(err error, what string) { + if err != nil { + log.Printf("%s failed: %v", what, err) + } + } + + if getStatus { + sendOrLog(sendSimpleCommand(client, printChr, 0xA1), "status") + } + if getBattery { + sendOrLog(sendSimpleCommand(client, printChr, 0xAB), "battery") + } + if getVersion { + sendOrLog(sendSimpleCommand(client, printChr, 0xB1), "version") + } + if getPrintType { + sendOrLog(sendSimpleCommand(client, printChr, 0xB0), "printtype") + } + if getQueryCount { + sendOrLog(sendSimpleCommand(client, printChr, 0xA7), "querycount") + } + if ejectPaper > 0 { + sendOrLog(sendLineCommand(client, printChr, 0xA3, ejectPaper), "eject") + } + if retractPaper > 0 { + sendOrLog(sendLineCommand(client, printChr, 0xA4, retractPaper), "retract") + } + log.Println("Waiting for notifications...") + time.Sleep(2 * time.Second) + client.CancelConnection() + // Give BlueZ a moment to release resources before reconnecting. + time.Sleep(reconnectDelay) + + if flag.NArg() < 1 { + return // no image to print + } + } + + // Phase 2: print + client, printChr, _, dataChr, attMTU, err := loadPrinter(ctx) + if err != nil { + log.Fatalf("Failed to load printer: %v", err) + } + defer client.CancelConnection() + + if printChr == nil { + log.Fatalf("Missing required print characteristic") + } + + i := max(intensity, 0) + i = min(i, 100) + intensityByte := byte(i) + + if dataChr == nil { + log.Fatalf("Missing required data characteristic") + } + + err = sendImageBufferToPrinter(client, dataChr, printChr, pixels, height, printMode, intensityByte, attMTU) + if err != nil { + log.Fatalf("Failed to print image: %v", err) + } + } + + log.Println("Done!") +} + +func buildCommand(cmdId byte, payload []byte) []byte { + cmd := append([]byte{}, printCommandHeader...) + cmd = append(cmd, cmdId) + cmd = append(cmd, 0x00) // reserved + cmd = append(cmd, byte(len(payload)&0xFF), byte(len(payload)>>8)) + cmd = append(cmd, payload...) + cmd = append(cmd, calculateCRC8(payload)) + cmd = append(cmd, printCommandFooter) + return cmd +} + +func calculateCRC8(data []byte) byte { + table := [256]byte{ + 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, + 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, + 0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, + 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d, + 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, + 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, + 0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, + 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd, + 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, + 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, + 0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, + 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a, + 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, + 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a, + 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, + 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, + 0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, + 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4, + 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, + 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4, + 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, + 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, + 0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, + 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34, + 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, + 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63, + 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, + 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, + 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, + 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83, + 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, + 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3} + crc := byte(0) + for _, b := range data { + crc = table[crc^b] + } + return crc +}