From bf4630076762d9c20c16c80c1c791f352b046dd1 Mon Sep 17 00:00:00 2001
From: Brad Bishop <bradleyb@us.ibm.com>
Date: Mon, 30 Jun 2014 22:10:16 -0500
Subject: Port FFS tools over from Building Block repository.

---
 fpart/src/cmd_read.c | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 fpart/src/cmd_read.c

(limited to 'fpart/src/cmd_read.c')

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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