Fix PT-P710BT raster protocol handling and add regression coverage.

Align print command payload generation with model-specific protocol requirements, add verbose CLI diagnostics and robust status retries, and introduce protocol regression tests to prevent future GF/ESC i z regressions. Made-with: Cursor
2026-04-17 03:24:00 +09:00
parent e92273a747
commit 42a785f086
8 changed files with 219 additions and 39 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,7 @@ configure_file(
 set(LIBPTOUCH_SOURCES
 	src/lib/libptouch_core.c
 	src/lib/libptouch_usb.c
+	src/lib/libptouch_protocol.c
 	src/lib/libptouch_layout.c
 	src/lib/libptouch_media_info.c
 	src/lib/libptouch_trim.c
@@ -74,6 +75,19 @@ if(NOT MSVC)
 	target_compile_options(ptouch-print PRIVATE -Wall -Wextra -Wpedantic)
 endif()

+enable_testing()
+add_executable(ptouch-protocol-regression-test
+	tests/protocol_regression_test.c
+	src/lib/libptouch_protocol.c
+)
+target_include_directories(ptouch-protocol-regression-test PRIVATE
+	"${CMAKE_CURRENT_SOURCE_DIR}/src/lib"
+)
+if(NOT MSVC)
+	target_compile_options(ptouch-protocol-regression-test PRIVATE -Wall -Wextra -Wpedantic)
+endif()
+add_test(NAME protocol_regression_test COMMAND ptouch-protocol-regression-test)
+
 install(TARGETS ptouch ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}")
 install(TARGETS ptouch_shared LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
 	RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
--- a/README.md
+++ b/README.md
@@ -8,8 +8,9 @@ Brother P-touch シリーズ向けのラベル印刷用 **C コアライブラ

 ## レイアウト

+
 | パス                      | 内容                                                                          |
-|------|------|
+| ----------------------- | --------------------------------------------------------------------------- |
 | `include/libptouch.h`   | 公開 API                                                                      |
 | `src/lib/libptouch_*.c` | ライブラリ本体（core / usb / print / status / png / svg）                            |
 | `src/cli/main.c`        | `ptouch-print` エントリ                                                         |
@@ -17,6 +18,7 @@ Brother P-touch シリーズ向けのラベル印刷用 **C コアライブラ
 | `ruby/`                 | Ruby FFI gem（`libptouch`）・コマンド `ptouch-print-png`（PNG のみ）— `ruby/README.md` |
 | `reference/`            | 仕様・参考資料（例: ラスター PDF）                                                        |

+
 ## ビルド

 依存: **CMake 3.16+**、**libusb-1.0**、**libpng**、**librsvg-2.0**（開発パッケージ例: `libusb-1.0-0-dev`、`libpng-dev`、`librsvg2-dev`）。
@@ -24,6 +26,7 @@ Brother P-touch シリーズ向けのラベル印刷用 **C コアライブラ
 ```bash
 cmake -S . -B build
 cmake --build build
+ctest --test-dir build --output-on-failure
 ```

 成果物（`build/` 以下）:
@@ -96,7 +99,7 @@ cmake --build build

 - 接続は **libusb-1.0** のみ。機種ごとに **VID/PID**（`lsusb` 等）を調べ、`libptouch_open_usb_vid_pid` に渡すか、既定の PT-P900W なら `libptouch_open_usb` を使います。PT-P750W は **04f9:2062**、PT-P710BT は **04f9:20af**（`include/libptouch.h` の定数参照）。
 - PT-P750W / PT-P710BT ではラスター幅方向は **180 dpi**（P900W は 360 dpi）。PNG から印刷する場合は解像度に合わせて画像を用意してください。
- ラスターコマンドの詳細は **`reference/` の PDF** および Brother 公開資料に沿って `src/lib/libptouch_*.c` に実装してください。
+- ラスターコマンドの詳細は `**reference/` の PDF** および Brother 公開資料に沿って `src/lib/libptouch_*.c` に実装してください。

 ### Ubuntu で sudo なしで USB を開く（udev）

--- a/src/cli/main.c
+++ b/src/cli/main.c
@@ -24,6 +24,7 @@ static void usage(const char *argv0)
 		"  -t, --threshold N  しきい値 0–255（既定 %u、PNG/SVG）\n"
 		"      --trim-right[=DOTS] 右側空白を削減（省略時は左余白、失敗時 0）\n"
 		"  -n, --dry-run       読み込みと check_raster のみ（USB なし）\n"
+		"  -v, --verbose       印刷前情報と印刷後ステータスを標準出力\n"
 		"  -p, --pid HEX       USB 製品 ID（既定: P900W の 0x2085）。例: P750W 0x2062、P710BT 0x20af\n"
 		"  -S, --status        ステータスを表示して終了\n"
 		"  -V, --version       バージョンを表示して終了\n"
@@ -101,6 +102,53 @@ static int read_file(const char *path, uint8_t **out, size_t *out_len)
 	return 0;
 }

+static void verbose_print_pre_print_info(libptouch_ctx *ctx,
+					 const libptouch_raster_params_t *params,
+					 size_t data_len)
+{
+	if (!ctx || !params)
+		return;
+
+	printf("=== verbose: pre-print info ===\n");
+	printf("raster bytes: %zu\n", data_len);
+	printf("raster size: %ux%u dots (length x width)\n",
+	       (unsigned)params->width_dots, (unsigned)params->height_dots);
+	printf("margin_mm: %u\n", (unsigned)params->margin_mm);
+
+	libptouch_media_info_t mi;
+	if (libptouch_get_current_media_info(ctx, &mi) == LIBPTOUCH_OK) {
+		printf("media width code: 0x%02X\n", (unsigned)mi.media_width_code);
+		printf("media kind code: 0x%02X\n", (unsigned)mi.media_kind_code);
+		printf("tape width: %.1f mm\n", mi.tape_width_mm);
+		printf("printable dots: %u\n", (unsigned)mi.printable_dots);
+		printf("left/right margins: %u/%u dots\n",
+		       (unsigned)mi.left_margin_dots, (unsigned)mi.right_margin_dots);
+		printf("print/feed dpi: %.1f/%.1f\n", mi.print_dpi, mi.feed_dpi);
+	} else {
+		printf("media info: unavailable (%s)\n", libptouch_strerror(ctx));
+	}
+
+	uint8_t st[LIBPTOUCH_STATUS_LENGTH];
+	if (libptouch_get_status(ctx, st) == LIBPTOUCH_OK) {
+		libptouch_status_fprint(stdout, st);
+	} else {
+		printf("status: unavailable (%s)\n", libptouch_strerror(ctx));
+	}
+}
+
+static void verbose_print_post_print_status(libptouch_ctx *ctx, const char *label)
+{
+	if (!ctx)
+		return;
+	printf("=== verbose: post-print status (%s) ===\n", label);
+	uint8_t st[LIBPTOUCH_STATUS_LENGTH];
+	if (libptouch_get_status(ctx, st) == LIBPTOUCH_OK) {
+		libptouch_status_fprint(stdout, st);
+	} else {
+		printf("status: unavailable (%s)\n", libptouch_strerror(ctx));
+	}
+}
+
 int main(int argc, char **argv)
 {
 	const char *file = NULL;
@@ -108,6 +156,7 @@ int main(int argc, char **argv)
 	unsigned threshold = LIBPTOUCH_PNG_DEFAULT_THRESHOLD;
 	unsigned usb_pid_arg = 0;
 	int dry_run = 0;
+	int verbose = 0;
 	int trim_right_enabled = 0;
 	int trim_right_auto = 0;
 	unsigned trim_right_dots = 0;
@@ -120,6 +169,7 @@ int main(int argc, char **argv)
 		{ "threshold", required_argument, NULL, 't' },
 		{ "trim-right", optional_argument, NULL, 'r' },
 		{ "dry-run", no_argument, NULL, 'n' },
+		{ "verbose", no_argument, NULL, 'v' },
 		{ "pid", required_argument, NULL, 'p' },
 		{ "status", no_argument, NULL, 'S' },
 		{ "version", no_argument, NULL, 'V' },
@@ -128,7 +178,7 @@ int main(int argc, char **argv)
 	};

 	int c;
-	while ((c = getopt_long(argc, argv, "w:H:f:t:r::p:nhSV", longopts, NULL)) !=
+	while ((c = getopt_long(argc, argv, "w:H:f:t:r::p:nvhSV", longopts, NULL)) !=
 	       -1) {
 		switch (c) {
 		case 'w':
@@ -151,6 +201,9 @@ int main(int argc, char **argv)
 		case 'n':
 			dry_run = 1;
 			break;
+		case 'v':
+			verbose = 1;
+			break;
 		case 'r':
 			trim_right_enabled = 1;
 			if (!optarg) {
@@ -397,8 +450,13 @@ int main(int argc, char **argv)
 		}
 	}

+	if (verbose)
+		verbose_print_pre_print_info(ctx, &params, data_len);
+
 	e = libptouch_print_raster(ctx, data, data_len, &params);
 	if (e != LIBPTOUCH_OK) {
+		if (verbose)
+			verbose_print_post_print_status(ctx, "print failed");
 		fprintf(stderr, "print_raster: %s\n",
 			libptouch_strerror(ctx));
 		libptouch_close(ctx);
@@ -410,6 +468,9 @@ int main(int argc, char **argv)
 		return 1;
 	}

+	if (verbose)
+		verbose_print_post_print_status(ctx, "print success");
+
 	libptouch_close(ctx);
 	libptouch_destroy(ctx);
 	if (data_from_lib)
--- a/src/lib/libptouch_print.c
+++ b/src/lib/libptouch_print.c
@@ -7,6 +7,7 @@

 #include "libptouch_internal.h"
 #include "libptouch_layout.h"
+#include "libptouch_protocol.h"

 #include <libusb.h>
 #include <stdio.h>
@@ -102,7 +103,7 @@ libptouch_err_t libptouch_print_raster(libptouch_ctx *ctx,
 	(void)right_dots;

 	unsigned head_dots = prof->head_width_dots;
-	size_t line_payload = (size_t)((head_dots + 7u) / 8u);
+	size_t line_payload = ptouch_line_payload_bytes(head_dots);
 	size_t gf_packet = 3u + line_payload;

 	uint32_t wd = params->width_dots;
@@ -139,21 +140,6 @@ libptouch_err_t libptouch_print_raster(libptouch_ctx *ctx,
 	}

 	uint32_t lines = ht;
-	uint8_t n5 = (uint8_t)(lines & 0xFFu);
-	uint8_t n6 = (uint8_t)((lines >> 8) & 0xFFu);
-	uint8_t n7 = (uint8_t)((lines >> 16) & 0xFFu);
-	uint8_t n8 = (uint8_t)((lines >> 24) & 0xFFu);
-
-	uint8_t n2_paper = 0x09u;
-	if (media_kind == 0x03u)
-		n2_paper = 0x00u;
-	else if (media_kind == 0x11u)
-		n2_paper = 0x11u;
-	else if (media_kind == 0x17u)
-		n2_paper = 0x17u;
-	else if (media_kind == 0x13u)
-		n2_paper = 0x13u;
-
 	uint8_t head[256];
 	size_t pos = 0;
 	memset(head + pos, 0, 200);
@@ -165,18 +151,28 @@ libptouch_err_t libptouch_print_raster(libptouch_ctx *ctx,
 	memcpy(head + pos, raster_mode, sizeof(raster_mode));
 	pos += sizeof(raster_mode);

-	uint8_t esc_iz[] = { 0x1B, 0x69, 0x7A, 0x0Eu, n2_paper, media_w,
-			     0x00u, n5,    n6,	  n7,	 n8,	0x02u, 0x00u };
+	uint8_t esc_iz[13];
+	ptouch_fill_esc_iz(esc_iz, media_kind, media_w, lines);
 	memcpy(head + pos, esc_iz, sizeof(esc_iz));
 	pos += sizeof(esc_iz);

 	static const uint8_t esc_im[] = { 0x1B, 0x69, 0x4D, 0x40 };
 	memcpy(head + pos, esc_im, sizeof(esc_im));
 	pos += sizeof(esc_im);
+
+	/*
+	 * ESC i A ("cut each n labels") is not supported on PT-P710BT class
+	 * devices. Sending it can trigger a communication error (red LED blink).
+	 * Keep it only for 560-dot family.
+	 */
+	if (prof->head_width_dots > 128u) {
 		static const uint8_t esc_ia[] = { 0x1B, 0x69, 0x41, 0x01 };
 		memcpy(head + pos, esc_ia, sizeof(esc_ia));
 		pos += sizeof(esc_ia);
-	static const uint8_t esc_ik[] = { 0x1B, 0x69, 0x4B, 0x0C };
+	}
+
+	/* Chain printing off; safer default for 128-dot family as well. */
+	static const uint8_t esc_ik[] = { 0x1B, 0x69, 0x4B, 0x08 };
 	memcpy(head + pos, esc_ik, sizeof(esc_ik));
 	pos += sizeof(esc_ik);

@@ -199,7 +195,6 @@ libptouch_err_t libptouch_print_raster(libptouch_ctx *ctx,
 	}

 	size_t row_b = ((size_t)wd + 7u) / 8u;
-	static const uint8_t g_hdr[] = { 0x47, 0x46, 0x00 };

 	uint8_t *gbuf = (uint8_t *)malloc(gf_packet);
 	if (!gbuf) {
@@ -213,7 +208,7 @@ libptouch_err_t libptouch_print_raster(libptouch_ctx *ctx,
 		const uint8_t *row = src + (size_t)y * row_b;
 		pack_line(gbuf + 3, line_payload, head_dots, row, wd, left_dots,
 			  print_dots);
-		memcpy(gbuf, g_hdr, sizeof(g_hdr));
+		ptouch_fill_gf_header(gbuf, line_payload);
 		v = ptouch_bulk_send_job(ctx, gbuf, gf_packet, "raster line");
 		if (v != LIBPTOUCH_OK) {
 			free(gbuf);
--- a/src/lib/libptouch_protocol.c
+++ b/src/lib/libptouch_protocol.c
@@ -0,0 +1,41 @@
+#include "libptouch_protocol.h"
+
+size_t ptouch_line_payload_bytes(unsigned head_dots)
+{
+	return (size_t)((head_dots + 7u) / 8u);
+}
+
+void ptouch_fill_gf_header(uint8_t out[3], size_t line_payload_bytes)
+{
+	out[0] = 0x47u;
+	out[1] = (uint8_t)(line_payload_bytes & 0xFFu);
+	out[2] = (uint8_t)((line_payload_bytes >> 8) & 0xFFu);
+}
+
+void ptouch_fill_esc_iz(uint8_t out[13], uint8_t media_kind, uint8_t media_width,
+			uint32_t raster_lines)
+{
+	uint8_t n2_paper = 0x09u;
+	if (media_kind == 0x03u)
+		n2_paper = 0x00u;
+	else if (media_kind == 0x11u)
+		n2_paper = 0x11u;
+	else if (media_kind == 0x17u)
+		n2_paper = 0x17u;
+	else if (media_kind == 0x13u)
+		n2_paper = 0x13u;
+
+	out[0] = 0x1Bu;
+	out[1] = 0x69u;
+	out[2] = 0x7Au;
+	out[3] = 0x0Eu;
+	out[4] = n2_paper;
+	out[5] = media_width;
+	out[6] = 0x00u;
+	out[7] = (uint8_t)(raster_lines & 0xFFu);
+	out[8] = (uint8_t)((raster_lines >> 8) & 0xFFu);
+	out[9] = (uint8_t)((raster_lines >> 16) & 0xFFu);
+	out[10] = (uint8_t)((raster_lines >> 24) & 0xFFu);
+	out[11] = 0x00u; /* first page */
+	out[12] = 0x00u; /* fixed */
+}
--- a/src/lib/libptouch_protocol.h
+++ b/src/lib/libptouch_protocol.h
@@ -0,0 +1,12 @@
+#ifndef LIBPTOUCH_PROTOCOL_H
+#define LIBPTOUCH_PROTOCOL_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+size_t ptouch_line_payload_bytes(unsigned head_dots);
+void ptouch_fill_gf_header(uint8_t out[3], size_t line_payload_bytes);
+void ptouch_fill_esc_iz(uint8_t out[13], uint8_t media_kind, uint8_t media_width,
+			uint32_t raster_lines);
+
+#endif /* LIBPTOUCH_PROTOCOL_H */
--- a/src/lib/libptouch_status.c
+++ b/src/lib/libptouch_status.c
@@ -9,6 +9,7 @@

 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>

 libptouch_err_t libptouch_get_status(libptouch_ctx *ctx, uint8_t *status)
 {
@@ -28,18 +29,26 @@ libptouch_err_t libptouch_get_status(libptouch_ctx *ctx, uint8_t *status)
 	static const uint8_t req[] = { 0x1B, 0x69, 0x53 };

 	int r = LIBUSB_ERROR_OTHER;
-	for (int attempt = 0; attempt < 2; attempt++) {
-		if (attempt > 0) {
+	for (int attempt = 0; attempt < 5; attempt++) {
+		/* First status read after reconnect can fail on some P-touch units. */
 		(void)libusb_clear_halt(h, ctx->bulk_in_ep);
 		(void)libusb_clear_halt(h, ctx->bulk_out_ep);
+		if (attempt > 0) {
+			usleep(120000); /* 120ms backoff */
 		}
 		r = ptouch_bulk_out(h, ctx->bulk_out_ep, init, 2, 5000u);
 		if (r != 0) {
+			if (r == LIBUSB_ERROR_IO || r == LIBUSB_ERROR_PIPE ||
+			    r == LIBUSB_ERROR_TIMEOUT)
+				continue;
 			ptouch_set_error_usb(ctx, r, "bulk OUT ESC @");
 			return LIBPTOUCH_ERR_USB;
 		}
 		r = ptouch_bulk_out(h, ctx->bulk_out_ep, req, 3, 5000u);
 		if (r != 0) {
+			if (r == LIBUSB_ERROR_IO || r == LIBUSB_ERROR_PIPE ||
+			    r == LIBUSB_ERROR_TIMEOUT)
+				continue;
 			ptouch_set_error_usb(ctx, r, "bulk OUT ESC i S");
 			return LIBPTOUCH_ERR_USB;
 		}
@@ -47,7 +56,8 @@ libptouch_err_t libptouch_get_status(libptouch_ctx *ctx, uint8_t *status)
 				  (int)LIBPTOUCH_STATUS_LENGTH, 5000u);
 		if (r == 0)
 			break;
-		if (r != LIBUSB_ERROR_IO && r != LIBUSB_ERROR_PIPE)
+		if (r != LIBUSB_ERROR_IO && r != LIBUSB_ERROR_PIPE &&
+		    r != LIBUSB_ERROR_TIMEOUT)
 			break;
 	}
 	if (r != 0) {
--- a/tests/protocol_regression_test.c
+++ b/tests/protocol_regression_test.c
@@ -0,0 +1,44 @@
+#include "libptouch_protocol.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+static int expect_int(const char *name, int got, int want)
+{
+	if (got == want)
+		return 0;
+	fprintf(stderr, "%s mismatch: got=%d want=%d\n", name, got, want);
+	return 1;
+}
+
+int main(void)
+{
+	int fail = 0;
+
+	fail |= expect_int("line_payload_128", (int)ptouch_line_payload_bytes(128u), 16);
+	fail |= expect_int("line_payload_560", (int)ptouch_line_payload_bytes(560u), 70);
+
+	uint8_t gf[3];
+	ptouch_fill_gf_header(gf, 16u);
+	fail |= expect_int("gf16_cmd", gf[0], 0x47);
+	fail |= expect_int("gf16_n1", gf[1], 0x10);
+	fail |= expect_int("gf16_n2", gf[2], 0x00);
+
+	ptouch_fill_gf_header(gf, 70u);
+	fail |= expect_int("gf70_cmd", gf[0], 0x47);
+	fail |= expect_int("gf70_n1", gf[1], 0x46);
+	fail |= expect_int("gf70_n2", gf[2], 0x00);
+
+	uint8_t iz[13];
+	ptouch_fill_esc_iz(iz, 0x01u, 0x0Cu, 70u);
+	fail |= expect_int("iz_cmd_0", iz[0], 0x1B);
+	fail |= expect_int("iz_cmd_1", iz[1], 0x69);
+	fail |= expect_int("iz_cmd_2", iz[2], 0x7A);
+	fail |= expect_int("iz_media_kind_map", iz[4], 0x09);
+	fail |= expect_int("iz_media_width", iz[5], 0x0C);
+	fail |= expect_int("iz_lines_lsb", iz[7], 70);
+	fail |= expect_int("iz_page_index", iz[11], 0x00);
+	fail |= expect_int("iz_last_fixed", iz[12], 0x00);
+
+	return fail ? EXIT_FAILURE : EXIT_SUCCESS;
+}