clean up mtd, fix up trx header when integrating jffs2 data on broadcom devices

SVN-Revision: 12655

package/mtd/src/trx.c

@@ -0,0 +1,165 @@
+/*
+ * trx.c
+ *
+ * Copyright (C) 2005 Mike Baker 
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#include <sys/ioctl.h>
+#include "mtd-api.h"
+#include "mtd.h"
+
+#define TRX_MAGIC       0x30524448      /* "HDR0" */
+struct trx_header {
+	unsigned magic;		/* "HDR0" */
+	unsigned len;		/* Length of file including header */
+	unsigned crc32;		/* 32-bit CRC from flag_version to end of file */
+	unsigned flag_version;	/* 0:15 flags, 16:31 version */
+	unsigned offsets[3];	/* Offsets of partitions from start of header */
+};
+
+static unsigned long *crc32 = NULL;
+
+static void init_crc32()
+{
+	unsigned long crc;
+	unsigned long poly = 0xEDB88320L;
+	int n, bit;
+
+	if (crc32)
+		return;
+
+	crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long));
+	if (!crc32) {
+		perror("malloc");
+		exit(1);
+	}
+
+	for (n = 0; n < 256; n++) {
+		crc = (unsigned long) n;
+		for (bit = 0; bit < 8; bit++)
+			crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
+		crc32[n] = crc;
+	}
+}
+
+static unsigned int crc32buf(char *buf, size_t len)
+{
+	unsigned int crc = 0xFFFFFFFF;
+	for (; len; len--, buf++)
+		crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+	return crc;
+}
+
+int
+trx_fixup(int fd, const char *name)
+{
+	struct mtd_info_user mtdInfo;
+	unsigned long len;
+	struct trx_header *trx;
+	void *ptr, *scan;
+	int bfd;
+
+	if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
+		fprintf(stderr, "Failed to get mtd info\n");
+		goto err;
+	}
+
+	len = mtdInfo.size;
+	if (mtdInfo.size <= 0) {
+		fprintf(stderr, "Invalid MTD device size\n");
+		goto err;
+	}
+
+	bfd = mtd_open(name, true);
+	ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
+	if (!ptr || (ptr == (void *) -1)) {
+		perror("mmap");
+		goto err1;
+	}
+
+	trx = ptr;
+	if (trx->magic != TRX_MAGIC) {
+		fprintf(stderr, "TRX header not found\n");
+		goto err;
+	}
+
+	init_crc32();
+	scan = ptr + offsetof(struct trx_header, flag_version);
+	trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
+	msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
+	munmap(ptr, len);
+	close(bfd);
+	return 0;
+
+err1:
+	close(bfd);
+err:
+	fprintf(stderr, "Error fixing up TRX header\n");
+	return -1;
+}
+
+int
+trx_check(int imagefd, const char *mtd, char *buf, int *len)
+{
+	const struct trx_header *trx = (const struct trx_header *) buf;
+	int fd;
+
+	if (strcmp(mtd, "linux") != 0)
+		return 1;
+
+	*len = read(imagefd, buf, 32);
+	if (*len < 32) {
+		fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
+		return 0;
+	}
+
+	if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
+		if (quiet < 2) {
+			fprintf(stderr, "Bad trx header\n");
+			fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
+					"Please specify the correct file or use -f to force.\n");
+		}
+		return 0;
+	}
+
+	/* check if image fits to mtd device */
+	fd = mtd_check_open(mtd);
+	if(fd < 0) {
+		fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+		exit(1);
+	}
+
+	if(mtdsize < trx->len) {
+		fprintf(stderr, "Image too big for partition: %s\n", mtd);
+		close(fd);
+		return 0;
+	}
+
+	close(fd);
+	return 1;
+}
+