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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 /fpart/src/cmd_read.c
downloadffs-bf4630076762d9c20c16c80c1c791f352b046dd1.zip
ffs-bf4630076762d9c20c16c80c1c791f352b046dd1.tar.gz
Port FFS tools over from Building Block repository.
Diffstat (limited to 'fpart/src/cmd_read.c')
-rw-r--r--fpart/src/cmd_read.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/fpart/src/cmd_read.c b/fpart/src/cmd_read.c
new file mode 100644
index 0000000..e058377
--- /dev/null
+++ b/fpart/src/cmd_read.c
@@ -0,0 +1,166 @@
+/*
+ * 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: 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 <regex.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 "main.h"
+
+int command_read(args_t * args)
+{
+ assert(args != NULL);
+
+ if (access(args->path, F_OK) == 0 && args->force != f_FORCE) {
+ UNEXPECTED("output file '%s' already exists, use --force "
+ "to overwrite\n", args->path);
+ return -1;
+ }
+
+ list_t list;
+ list_init(&list);
+
+ list_iter_t it;
+ ffs_entry_node_t * node;
+
+ /* ========================= */
+
+ int read(args_t * args, off_t poffset)
+ {
+ const char * target = args->target;
+ int debug = args->debug;
+
+ RAII(FILE*, file, fopen_generic(target, "r", debug), fclose);
+ if (file == NULL)
+ return -1;
+ RAII(ffs_t*, ffs, __ffs_fopen(file, poffset), __ffs_fclose);
+ if (ffs == NULL)
+ return -1;
+
+ size_t block_size = ffs->hdr->block_size;
+
+ if (args->block != NULL) {
+ if (parse_size(args->block, &block_size) < 0)
+ return -1;
+ if (block_size & (ffs->hdr->block_size-1)) {
+ UNEXPECTED("'%x' block size must be multiple "
+ "of target block size '%x'",
+ block_size, ffs->hdr->block_size);
+ return -1;
+ }
+ }
+
+ if (__ffs_buffer(ffs, block_size) < 0)
+ return -1;
+
+ RAII(void*, block, malloc(block_size), free);
+ if (block == NULL) {
+ ERRNO(errno);
+ return -1;
+ }
+
+ ffs_entry_t entry;
+ if (__ffs_entry_find(ffs, args->name, &entry) == false) {
+ UNEXPECTED("'%s' partition not found => %s",
+ args->target, args->name);
+ return -1;
+ }
+
+ list_iter_init(&it, &list, LI_FLAG_FWD);
+ list_for_each(&it, node, node) {
+ if (node->entry.base == entry.base &&
+ node->entry.size == entry.size)
+ return 0;
+ }
+
+ node = (ffs_entry_node_t *)malloc(sizeof(*node));
+ assert(node != NULL);
+
+ memcpy(&node->entry, &entry, sizeof(node->entry));
+ list_add_tail(&list, &node->node);
+
+ RAII(FILE*, out, fopen(args->path, "w+"), fclose);
+ if (out == NULL) {
+ ERRNO(errno);
+ return -1;
+ }
+
+ size_t data_size = entry.actual;
+ off_t data_offset = 0;
+
+ while (0 < data_size) {
+ ssize_t rc;
+ rc = __ffs_entry_read(ffs, args->name,
+ block, data_offset,
+ min(block_size, data_size));
+
+ rc = fwrite(block, 1, rc, out);
+ if (rc <= 0 && ferror(out)) {
+ ERRNO(errno);
+ return -1;
+ }
+
+ data_size -= rc;
+ data_offset += rc;
+ }
+
+ if (args->verbose == f_VERBOSE)
+ printf("%llx: %s: wrote '%x' bytes to file '%s'\n",
+ poffset, args->name, entry.actual, args->path);
+
+ return 0;
+ }
+
+ /* ========================= */
+
+ int rc = command(args, read);
+
+ while (!list_empty(&list))
+ free(container_of(list_remove_head(&list),
+ ffs_entry_node_t, node));
+
+ return rc;
+}
+
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