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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "mksquashfs.h"
#include "util.h"
#include <endian.h>
int sqfs_super_init(sqfs_info_t *info)
{
unsigned int i;
if (info->opt.blksz & (info->opt.blksz - 1)) {
fputs("Block size must be a power of 2!\n", stderr);
return -1;
}
if (info->opt.blksz < 8192 || info->opt.blksz >= (1 << 24)) {
fputs("Block size must be between 8k and 1M\n", stderr);
return -1;
}
memset(&info->super, 0, sizeof(info->super));
info->super.magic = SQFS_MAGIC;
info->super.modification_time = info->opt.def_mtime;
info->super.block_size = info->opt.blksz;
info->super.compression_id = info->opt.compressor;
info->super.flags = SQFS_FLAG_NO_FRAGMENTS | SQFS_FLAG_NO_XATTRS;
info->super.version_major = SQFS_VERSION_MAJOR;
info->super.version_minor = SQFS_VERSION_MINOR;
info->super.bytes_used = sizeof(info->super);
info->super.id_table_start = 0xFFFFFFFFFFFFFFFFUL;
info->super.xattr_id_table_start = 0xFFFFFFFFFFFFFFFFUL;
info->super.inode_table_start = 0xFFFFFFFFFFFFFFFFUL;
info->super.directory_table_start = 0xFFFFFFFFFFFFFFFFUL;
info->super.fragment_table_start = 0xFFFFFFFFFFFFFFFFUL;
info->super.export_table_start = 0xFFFFFFFFFFFFFFFFUL;
for (i = info->opt.blksz; i != 0x01; i >>= 1)
info->super.block_log += 1;
return 0;
}
int sqfs_padd_file(sqfs_info_t *info)
{
size_t padd_sz = info->super.bytes_used % info->opt.devblksz;
uint8_t *buffer;
ssize_t ret;
if (padd_sz == 0)
return 0;
padd_sz = info->opt.devblksz - padd_sz;
buffer = calloc(1, padd_sz);
if (buffer == NULL) {
perror("padding output file to block size");
return -1;
}
ret = write_retry(info->outfd, buffer, padd_sz);
if (ret < 0) {
perror("Error padding squashfs image to page size");
free(buffer);
return -1;
}
if ((size_t)ret < padd_sz) {
fputs("Truncated write trying to padd squashfs image\n",
stderr);
return -1;
}
free(buffer);
return 0;
}
int sqfs_super_write(sqfs_info_t *info)
{
sqfs_super_t copy;
ssize_t ret;
copy.magic = htole32(info->super.magic);
copy.inode_count = htole32(info->super.inode_count);
copy.modification_time = htole32(info->super.modification_time);
copy.block_size = htole32(info->super.block_size);
copy.fragment_entry_count = htole32(info->super.fragment_entry_count);
copy.compression_id = htole16(info->super.compression_id);
copy.block_log = htole16(info->super.block_log);
copy.flags = htole16(info->super.flags);
copy.id_count = htole16(info->super.id_count);
copy.version_major = htole16(info->super.version_major);
copy.version_minor = htole16(info->super.version_minor);
copy.root_inode_ref = htole64(info->super.root_inode_ref);
copy.bytes_used = htole64(info->super.bytes_used);
copy.id_table_start = htole64(info->super.id_table_start);
copy.xattr_id_table_start = htole64(info->super.xattr_id_table_start);
copy.inode_table_start = htole64(info->super.inode_table_start);
copy.directory_table_start = htole64(info->super.directory_table_start);
copy.fragment_table_start = htole64(info->super.fragment_table_start);
copy.export_table_start = htole64(info->super.export_table_start);
if (lseek(info->outfd, 0, SEEK_SET) == (off_t)-1)
goto fail_seek;
ret = write_retry(info->outfd, ©, sizeof(copy));
if (ret < 0) {
perror("squashfs writing super block");
return -1;
}
if ((size_t)ret < sizeof(copy)) {
fputs("squashfs writing super block: truncated write\n",
stderr);
return -1;
}
if (lseek(info->outfd, 0, SEEK_END) == (off_t)-1)
goto fail_seek;
return 0;
fail_seek:
perror("squashfs writing super block: seek on output file");
return -1;
}
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