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authorBrad Bishop <bradleyb@us.ibm.com>2014-06-30 22:10:16 -0500
committerPatrick Williams <iawillia@us.ibm.com>2014-07-02 22:49:29 -0500
commitbf4630076762d9c20c16c80c1c791f352b046dd1 (patch)
treeefc67bad010a28fd1abf5aeeefda2a969514fd97 /fcp/src/cmd_read.c
downloadffs-bf4630076762d9c20c16c80c1c791f352b046dd1.zip
ffs-bf4630076762d9c20c16c80c1c791f352b046dd1.tar.gz
Port FFS tools over from Building Block repository.
Diffstat (limited to 'fcp/src/cmd_read.c')
-rw-r--r--fcp/src/cmd_read.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/fcp/src/cmd_read.c b/fcp/src/cmd_read.c
new file mode 100644
index 0000000..7923b46
--- /dev/null
+++ b/fcp/src/cmd_read.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (c) International Business Machines Corp., 2012
+ *
+ * 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
+ */
+
+/*
+ * File: cmd_read.c
+ * Author: Shaun Wetzstein <shaun@us.ibm.com>
+ * Descr: read implementation
+ * Date: 01/30/2013
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <fcntl.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include <clib/attribute.h>
+#include <clib/assert.h>
+#include <clib/list.h>
+#include <clib/list_iter.h>
+#include <clib/misc.h>
+#include <clib/min.h>
+#include <clib/err.h>
+#include <clib/raii.h>
+
+#include "misc.h"
+#include "main.h"
+
+static int __read(args_t * args, off_t offset, entry_list_t * done_list)
+{
+ assert(args != NULL);
+
+ char * type = args->src_type;
+ char * target = args->src_target;
+ char * name = args->src_name;
+
+ char * out_path = args->dst_target;
+
+ RAII(FILE*, file, __fopen(type, target, "r", debug), fclose);
+ if (file == NULL)
+ return -1;
+ if (check_file(target, file, offset) < 0)
+ return -1;
+ RAII(ffs_t*, ffs, __ffs_fopen(file, offset), __ffs_fclose);
+ if (ffs == NULL)
+ return -1;
+
+ done_list->ffs = ffs;
+
+ if (ffs->count <= 0)
+ return 0;
+
+ size_t block_size;
+ if (__ffs_info(ffs, FFS_INFO_BLOCK_SIZE, &block_size) < 0)
+ return -1;
+
+ if (args->buffer != NULL) {
+ size_t buffer;
+ if (parse_size(args->buffer, &buffer) < 0)
+ return -1;
+ if (__ffs_buffer(ffs, buffer) < 0)
+ return -1;
+ }
+
+ ffs_entry_t entry;
+ if (__ffs_entry_find(ffs, name, &entry) == false) {
+ UNEXPECTED("partition entry '%s' not found\n", name);
+ return -1;
+ }
+
+ if (entry.actual == 0) {
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: is empty (skip)\n",
+ offset, name);
+ return 0;
+ }
+
+ char full_name[page_size];
+ if (__ffs_entry_name(ffs, &entry, full_name,
+ sizeof full_name) < 0)
+ return -1;
+
+ if (entry.type == FFS_TYPE_LOGICAL) {
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: logical (skip)\n",
+ offset, name);
+ return 0;
+ }
+
+ if (entry_list_exists(done_list, &entry) == 1) {
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: write to '%s' (skip)\n",
+ offset, full_name, out_path);
+ return 0;
+ }
+
+ if (entry_list_add(done_list, &entry) < 0)
+ return -1;
+
+ if (strcmp(out_path, "-") == 0) {
+ if (fcp_read_entry(ffs, full_name, stdout) < 0)
+ return -1;
+ } else {
+ if (access(out_path, F_OK) == 0 && args->force != f_FORCE) {
+ UNEXPECTED("output file '%s' already exists, "
+ "use --force to overwrite\n", out_path);
+ return -1;
+ }
+
+ RAII(FILE*, out, fopen(out_path, "w+"), fclose);
+ if (out == NULL) {
+ ERRNO(errno);
+ return -1;
+ }
+
+ if (fcp_read_entry(ffs, full_name, out) < 0)
+ return -1;
+
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: write to '%s' (done)\n",
+ offset, full_name, out_path);
+ }
+
+ return 0;
+}
+
+int command_read(args_t * args)
+{
+ assert(args != NULL);
+
+ int rc = 0;
+
+ RAII(entry_list_t*, done_list, entry_list_create(NULL),
+ entry_list_delete);
+ if (done_list == NULL)
+ return -1;
+
+ char * end = (char *)args->offset;
+ while (rc == 0 && end != NULL && *end != '\0') {
+ errno = 0;
+ off_t offset = strtoull(end, &end, 0);
+ if (end == NULL || errno != 0) {
+ UNEXPECTED("invalid --offset specified '%s'",
+ args->offset);
+ return -1;
+ }
+
+ if (*end != ',' && *end != ':' && *end != '\0') {
+ UNEXPECTED("invalid --offset separator "
+ "character '%c'", *end);
+ return -1;
+ }
+
+ rc = __read(args, offset, done_list);
+ if (rc < 0)
+ break;
+
+ if (*end == '\0')
+ break;
+ end++;
+ }
+
+ return rc;
+}
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