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89 lines
2.3 KiB
89 lines
2.3 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "squashfs_utils.h"
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#include <cutils/fs.h>
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#include <cutils/klog.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "squashfs_fs.h"
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#ifdef SQUASHFS_NO_KLOG
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#include <stdio.h>
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#define ERROR(x...) fprintf(stderr, x)
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#else
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#define ERROR(x...) KLOG_ERROR("squashfs_utils", x)
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#endif
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size_t squashfs_get_sb_size()
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{
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return sizeof(struct squashfs_super_block);
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}
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int squashfs_parse_sb_buffer(const void *buf, struct squashfs_info *info)
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{
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const struct squashfs_super_block *sb =
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(const struct squashfs_super_block *)buf;
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if (sb->s_magic != SQUASHFS_MAGIC) {
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return -1;
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}
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info->block_size = sb->block_size;
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info->inodes = sb->inodes;
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info->bytes_used = sb->bytes_used;
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// by default mksquashfs pads the filesystem to 4K blocks
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info->bytes_used_4K_padded =
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sb->bytes_used + (4096 - (sb->bytes_used & (4096 - 1)));
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return 0;
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}
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int squashfs_parse_sb(const char *blk_device, struct squashfs_info *info)
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{
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int ret = 0;
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struct squashfs_super_block sb;
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int data_device;
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data_device = TEMP_FAILURE_RETRY(open(blk_device, O_RDONLY | O_CLOEXEC));
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if (data_device == -1) {
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ERROR("Error opening block device (%s)\n", strerror(errno));
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return -1;
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}
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if (TEMP_FAILURE_RETRY(read(data_device, &sb, sizeof(sb)))
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!= sizeof(sb)) {
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ERROR("Error reading superblock\n");
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ret = -1;
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goto cleanup;
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}
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if (squashfs_parse_sb_buffer(&sb, info) == -1) {
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ERROR("Not a valid squashfs filesystem\n");
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ret = -1;
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goto cleanup;
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}
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cleanup:
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close(data_device);
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return ret;
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}
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