flashcp: new applet by Stefan Seyfried. +900 bytes

Signed-off-by: Stefan Seyfried <stefan.seyfried@googlemail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 159 insertions, 0 deletions

diff --git a/miscutils/Config.in b/miscutils/Config.in
index 842f7f9d2..ebf98f98c 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -272,6 +272,13 @@ config FBSPLASH
 	    "NN" (ASCII decimal number) - percentage to show on progress bar
 	    "exit" - well you guessed it
 
+config FLASHCP
+	bool "flashcp"
+	default n
+	help
+	  The flashcp binary, inspired by mtd-utils as of git head 5eceb74f7.
+	  This utility is used to copy images into a MTD device.
+
 config FLASH_LOCK
 	bool "flash_lock"
 	default n
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index 22a9adb34..bbfa93dc7 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -17,6 +17,7 @@ lib-$(CONFIG_DEVFSD)      += devfsd.o
 lib-$(CONFIG_DEVMEM)      += devmem.o
 lib-$(CONFIG_EJECT)       += eject.o
 lib-$(CONFIG_FBSPLASH)    += fbsplash.o
+lib-$(CONFIG_FLASHCP)     += flashcp.o
 lib-$(CONFIG_FLASH_ERASEALL) += flash_eraseall.o
 lib-$(CONFIG_FLASH_LOCK)     += flash_lock_unlock.o
 lib-$(CONFIG_FLASH_UNLOCK)   += flash_lock_unlock.o
diff --git a/miscutils/flashcp.c b/miscutils/flashcp.c
new file mode 100644
index 000000000..9472c7527
--- /dev/null
+++ b/miscutils/flashcp.c
@@ -0,0 +1,151 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * busybox reimplementation of flashcp
+ *
+ * (C) 2009 Stefan Seyfried <seife@sphairon.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include <mtd/mtd-user.h>
+
+#define MTD_DEBUG 0
+
+#define OPT_v (1 << 0)
+
+#define BUFSIZE (8 * 1024)
+
+static void progress(int mode, uoff_t count, uoff_t total)
+{
+	uoff_t percent;
+
+	if (!option_mask32) //if (!(option_mask32 & OPT_v))
+		return;
+	percent = count * 100;
+	if (total)
+		percent = (unsigned) (percent / total);
+	printf("\r%s: %"OFF_FMT"u/%"OFF_FMT"u (%u%%) ",
+		(mode == 0) ? "Erasing block" : ((mode == 1) ? "Writing kb" : "Verifying kb"),
+		count, total, (unsigned)percent);
+	fflush_all();
+}
+
+static void progress_newline(void)
+{
+	if (!option_mask32) //if (!(option_mask32 & OPT_v))
+		return;
+	bb_putchar('\n');
+}
+
+int flashcp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int flashcp_main(int argc UNUSED_PARAM, char **argv)
+{
+	int fd_f, fd_d; /* input file and mtd device file descriptors */
+	int i;
+	uoff_t erase_count;
+	unsigned opts;
+	struct mtd_info_user mtd;
+	struct erase_info_user e;
+	struct stat statb;
+//	const char *filename, *devicename;
+	RESERVE_CONFIG_UBUFFER(buf, BUFSIZE);
+	RESERVE_CONFIG_UBUFFER(buf2, BUFSIZE);
+
+	opt_complementary = "=2"; /* exactly 2 non-option args: file, dev */
+	opts = getopt32(argv, "v");
+	argv += optind;
+//	filename = *argv++;
+//	devicename = *argv;
+#define filename argv[0]
+#define devicename argv[1]
+
+	/* open input file and mtd device and do sanity checks */
+	fd_f = xopen(filename, O_RDONLY);
+	fstat(fd_f, &statb);
+	fd_d = xopen(devicename, O_SYNC | O_RDWR);
+#if !MTD_DEBUG
+	if (ioctl(fd_d, MEMGETINFO, &mtd) < 0) {
+		bb_error_msg_and_die("%s is not a MTD flash device", devicename);
+	}
+	if (statb.st_size > mtd.size) {
+		bb_error_msg_and_die("%s bigger than %s", filename, devicename);
+	}
+#else
+	mtd.erasesize = 64 * 1024;
+#endif
+
+	/* always erase a complete block */
+	erase_count = (uoff_t)(statb.st_size + mtd.erasesize - 1) / mtd.erasesize;
+	/* erase 1 block at a time to be able to give verbose output */
+	e.length = mtd.erasesize;
+#if 0
+/* (1) bloat
+ * (2) will it work for multi-gigabyte devices?
+ * (3) worse wrt error detection granularity
+ */
+	/* optimization: if not verbose, erase in one go */
+	if (!opts) { // if (!(opts & OPT_v))
+		e.length = mtd.erasesize * erase_count;
+		erase_count = 1;
+	}
+#endif
+	e.start = 0;
+	for (i = 1; i <= erase_count; i++) {
+		progress(0, i, erase_count);
+		errno = 0;
+#if !MTD_DEBUG
+		if (ioctl(fd_d, MEMERASE, &e) < 0) {
+			bb_perror_msg_and_die("erase error at 0x%llx on %s",
+				(long long)e.start, devicename);
+		}
+#else
+		usleep(100*1000);
+#endif
+		e.start += mtd.erasesize;
+	}
+	progress_newline();
+
+	/* doing this outer loop gives significantly smaller code
+	 * than doing two separate loops for writing and verifying */
+	for (i = 1; i <= 2; i++) {
+		uoff_t done;
+		unsigned count;
+
+		xlseek(fd_f, 0, SEEK_SET);
+		xlseek(fd_d, 0, SEEK_SET);
+		done = 0;
+		count = BUFSIZE;
+		while (1) {
+			uoff_t rem = statb.st_size - done;
+			if (rem == 0)
+				break;
+			if (rem < BUFSIZE)
+				count = rem;
+			progress(i, done / 1024, (uoff_t)statb.st_size / 1024);
+			xread(fd_f, buf, count);
+			if (i == 1) {
+				int ret;
+				errno = 0;
+				ret = full_write(fd_d, buf, count);
+				if (ret != count) {
+					bb_perror_msg_and_die("write error at 0x%"OFF_FMT"x on %s, "
+						"write returned %d",
+						done, devicename, ret);
+				}
+			} else { /* i == 2 */
+				xread(fd_d, buf2, count);
+				if (memcmp(buf, buf2, count)) {
+					bb_error_msg_and_die("verification mismatch at 0x%"OFF_FMT"x", done);
+				}
+			}
+
+			done += count;
+		}
+
+		progress_newline();
+	}
+	/* we won't come here if there was an error */
+
+	return EXIT_SUCCESS;
+}