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authorGabor Juhos <juhosg@openwrt.org>2011-07-02 08:37:56 +0000
committerGabor Juhos <juhosg@openwrt.org>2011-07-02 08:37:56 +0000
commit7ce98c60011f7da5cbfa26187412c44545fa12d3 (patch)
treef2b6b94c0e38b43d3e04b9754aa07524ba522a80 /tools/padjffs2/src/padjffs2.c
parentea8440f4c347dd349eaefb16a57c6dd458e45394 (diff)
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tools: create a new tool for more efficient jffs2 padding
SVN-Revision: 27355
Diffstat (limited to 'tools/padjffs2/src/padjffs2.c')
-rw-r--r--tools/padjffs2/src/padjffs2.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/tools/padjffs2/src/padjffs2.c b/tools/padjffs2/src/padjffs2.c
new file mode 100644
index 0000000..679992d
--- /dev/null
+++ b/tools/padjffs2/src/padjffs2.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+static char *progname;
+static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
+
+#define ERR(fmt, ...) do { \
+ fflush(0); \
+ fprintf(stderr, "[%s] *** error: " fmt "\n", \
+ progname, ## __VA_ARGS__ ); \
+} while (0)
+
+#define ERRS(fmt, ...) do { \
+ int save = errno; \
+ fflush(0); \
+ fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
+ progname, ## __VA_ARGS__, strerror(save)); \
+} while (0)
+
+#define BUF_SIZE (64 * 1024)
+#define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1))
+
+static int pad_image(char *name, uint32_t pad_mask)
+{
+ char *buf;
+ int fd;
+ ssize_t in_len;
+ ssize_t out_len;
+ int ret = -1;
+
+ buf = malloc(BUF_SIZE);
+ if (!buf) {
+ ERR("No memory for buffer");
+ goto out;
+ }
+
+ fd = open(name, O_RDWR);
+ if (fd < 0) {
+ ERRS("Unable to open %s", name);
+ goto free_buf;
+ }
+
+ in_len = lseek(fd, 0, SEEK_END);
+ if (in_len < 0)
+ goto close;
+
+ memset(buf, '\xff', BUF_SIZE);
+
+ out_len = in_len;
+ while (pad_mask) {
+ uint32_t mask;
+ ssize_t t;
+ int i;
+
+ for (i = 10; i < 32; i++) {
+ mask = 1UL << i;
+ if (pad_mask & mask)
+ break;
+ }
+
+ in_len = ALIGN(in_len, mask);
+
+ for (i = 10; i < 32; i++) {
+ mask = 1UL << i;
+ if ((in_len & (mask - 1)) == 0)
+ pad_mask &= ~mask;
+ }
+
+ printf("padding image to %08x\n", in_len);
+
+ while (out_len < in_len) {
+ ssize_t len;
+
+ len = in_len - out_len;
+ if (len > BUF_SIZE)
+ len = BUF_SIZE;
+
+ t = write(fd, buf, len);
+ if (t != len) {
+ ERRS("Unable to write to %s", name);
+ goto close;
+ }
+
+ out_len += len;
+ }
+
+ /* write out the JFFS end-of-filesystem marker */
+ t = write(fd, eof_mark, 4);
+ if (t != 4) {
+ ERRS("Unable to write to %s", name);
+ goto close;
+ }
+ out_len += 4;
+ }
+
+ ret = 0;
+
+close:
+ close(fd);
+free_buf:
+ free(buf);
+out:
+ return ret;
+}
+
+int main(int argc, char* argv[])
+{
+ uint32_t pad_mask;
+ int ret = EXIT_FAILURE;
+ int err;
+ int i;
+
+ progname = basename(argv[0]);
+
+ if (argc < 2) {
+ fprintf(stderr,
+ "Usage: %s file [pad0] [pad1] [padN]\n",
+ progname);
+ goto out;
+ }
+
+ pad_mask = 0;
+ for (i = 2; i < argc; i++)
+ pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
+
+ if (pad_mask == 0)
+ pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) |
+ (128 * 1024);
+
+ err = pad_image(argv[1], pad_mask);
+ if (err)
+ goto out;
+
+ ret = EXIT_SUCCESS;
+
+out:
+ return ret;
+}