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/*
* 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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